| /* |
| md.c : Multiple Devices driver for Linux |
| Copyright (C) 1998, 1999, 2000 Ingo Molnar |
| |
| completely rewritten, based on the MD driver code from Marc Zyngier |
| |
| Changes: |
| |
| - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar |
| - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> |
| - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> |
| - kerneld support by Boris Tobotras <boris@xtalk.msk.su> |
| - kmod support by: Cyrus Durgin |
| - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> |
| - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> |
| |
| - lots of fixes and improvements to the RAID1/RAID5 and generic |
| RAID code (such as request based resynchronization): |
| |
| Neil Brown <neilb@cse.unsw.edu.au>. |
| |
| - persistent bitmap code |
| Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| You should have received a copy of the GNU General Public License |
| (for example /usr/src/linux/COPYING); if not, write to the Free |
| Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #include <linux/kthread.h> |
| #include <linux/blkdev.h> |
| #include <linux/sysctl.h> |
| #include <linux/seq_file.h> |
| #include <linux/fs.h> |
| #include <linux/poll.h> |
| #include <linux/ctype.h> |
| #include <linux/string.h> |
| #include <linux/hdreg.h> |
| #include <linux/proc_fs.h> |
| #include <linux/random.h> |
| #include <linux/module.h> |
| #include <linux/reboot.h> |
| #include <linux/file.h> |
| #include <linux/compat.h> |
| #include <linux/delay.h> |
| #include <linux/raid/md_p.h> |
| #include <linux/raid/md_u.h> |
| #include <linux/slab.h> |
| #include "md.h" |
| #include "bitmap.h" |
| |
| #ifndef MODULE |
| static void autostart_arrays(int part); |
| #endif |
| |
| /* 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 void md_print_devices(void); |
| |
| static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
| static struct workqueue_struct *md_wq; |
| static struct workqueue_struct *md_misc_wq; |
| |
| static int remove_and_add_spares(struct mddev *mddev, |
| struct md_rdev *this); |
| |
| #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
| |
| /* |
| * Default number of read corrections we'll attempt on an rdev |
| * before ejecting it from the array. We divide the read error |
| * count by 2 for every hour elapsed between read errors. |
| */ |
| #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 |
| /* |
| * 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. |
| * |
| * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. |
| * or /sys/block/mdX/md/sync_speed_{min,max} |
| */ |
| |
| static int sysctl_speed_limit_min = 1000; |
| static int sysctl_speed_limit_max = 200000; |
| static inline int speed_min(struct mddev *mddev) |
| { |
| return mddev->sync_speed_min ? |
| mddev->sync_speed_min : sysctl_speed_limit_min; |
| } |
| |
| static inline int speed_max(struct mddev *mddev) |
| { |
| return mddev->sync_speed_max ? |
| mddev->sync_speed_max : sysctl_speed_limit_max; |
| } |
| |
| static struct ctl_table_header *raid_table_header; |
| |
| static struct ctl_table raid_table[] = { |
| { |
| .procname = "speed_limit_min", |
| .data = &sysctl_speed_limit_min, |
| .maxlen = sizeof(int), |
| .mode = S_IRUGO|S_IWUSR, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "speed_limit_max", |
| .data = &sysctl_speed_limit_max, |
| .maxlen = sizeof(int), |
| .mode = S_IRUGO|S_IWUSR, |
| .proc_handler = proc_dointvec, |
| }, |
| { } |
| }; |
| |
| static 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, |
| }, |
| { } |
| }; |
| |
| static const struct block_device_operations md_fops; |
| |
| static int start_readonly; |
| |
| /* bio_clone_mddev |
| * like bio_clone, but with a local bio set |
| */ |
| |
| struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
| struct mddev *mddev) |
| { |
| struct bio *b; |
| |
| if (!mddev || !mddev->bio_set) |
| return bio_alloc(gfp_mask, nr_iovecs); |
| |
| b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
| if (!b) |
| return NULL; |
| return b; |
| } |
| EXPORT_SYMBOL_GPL(bio_alloc_mddev); |
| |
| struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, |
| struct mddev *mddev) |
| { |
| if (!mddev || !mddev->bio_set) |
| return bio_clone(bio, gfp_mask); |
| |
| return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
| } |
| EXPORT_SYMBOL_GPL(bio_clone_mddev); |
| |
| /* |
| * We have a system wide 'event count' that is incremented |
| * on any 'interesting' event, and readers of /proc/mdstat |
| * can use 'poll' or 'select' to find out when the event |
| * count increases. |
| * |
| * Events are: |
| * start array, stop array, error, add device, remove device, |
| * start build, activate spare |
| */ |
| static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
| static atomic_t md_event_count; |
| void md_new_event(struct mddev *mddev) |
| { |
| atomic_inc(&md_event_count); |
| wake_up(&md_event_waiters); |
| } |
| EXPORT_SYMBOL_GPL(md_new_event); |
| |
| /* Alternate version that can be called from interrupts |
| * when calling sysfs_notify isn't needed. |
| */ |
| static void md_new_event_inintr(struct mddev *mddev) |
| { |
| atomic_inc(&md_event_count); |
| wake_up(&md_event_waiters); |
| } |
| |
| /* |
| * Enables to iterate over all existing md arrays |
| * all_mddevs_lock protects this list. |
| */ |
| static LIST_HEAD(all_mddevs); |
| static DEFINE_SPINLOCK(all_mddevs_lock); |
| |
| |
| /* |
| * iterates through all used mddevs in the system. |
| * We take care to grab the all_mddevs_lock whenever navigating |
| * the list, and to always hold a refcount when unlocked. |
| * Any code which breaks out of this loop while own |
| * a reference to the current mddev and must mddev_put it. |
| */ |
| #define for_each_mddev(_mddev,_tmp) \ |
| \ |
| for (({ spin_lock(&all_mddevs_lock); \ |
| _tmp = all_mddevs.next; \ |
| _mddev = NULL;}); \ |
| ({ if (_tmp != &all_mddevs) \ |
| mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ |
| spin_unlock(&all_mddevs_lock); \ |
| if (_mddev) mddev_put(_mddev); \ |
| _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ |
| _tmp != &all_mddevs;}); \ |
| ({ spin_lock(&all_mddevs_lock); \ |
| _tmp = _tmp->next;}) \ |
| ) |
| |
| |
| /* 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. |
| * We hold a refcount over the call to ->make_request. By the time that |
| * call has finished, the bio has been linked into some internal structure |
| * and so is visible to ->quiesce(), so we don't need the refcount any more. |
| */ |
| static void md_make_request(struct request_queue *q, struct bio *bio) |
| { |
| const int rw = bio_data_dir(bio); |
| struct mddev *mddev = q->queuedata; |
| int cpu; |
| unsigned int sectors; |
| |
| if (mddev == NULL || mddev->pers == NULL |
| || !mddev->ready) { |
| bio_io_error(bio); |
| return; |
| } |
| if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
| bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); |
| return; |
| } |
| smp_rmb(); /* Ensure implications of 'active' are visible */ |
| rcu_read_lock(); |
| if (mddev->suspended) { |
| DEFINE_WAIT(__wait); |
| for (;;) { |
| prepare_to_wait(&mddev->sb_wait, &__wait, |
| TASK_UNINTERRUPTIBLE); |
| if (!mddev->suspended) |
| break; |
| rcu_read_unlock(); |
| schedule(); |
| rcu_read_lock(); |
| } |
| finish_wait(&mddev->sb_wait, &__wait); |
| } |
| atomic_inc(&mddev->active_io); |
| rcu_read_unlock(); |
| |
| /* |
| * save the sectors now since our bio can |
| * go away inside make_request |
| */ |
| sectors = bio_sectors(bio); |
| mddev->pers->make_request(mddev, bio); |
| |
| cpu = part_stat_lock(); |
| part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); |
| part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); |
| part_stat_unlock(); |
| |
| if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
| wake_up(&mddev->sb_wait); |
| } |
| |
| /* mddev_suspend makes sure no new requests are submitted |
| * to the device, and that any requests that have been submitted |
| * are completely handled. |
| * Once ->stop is called and completes, the module will be completely |
| * unused. |
| */ |
| void mddev_suspend(struct mddev *mddev) |
| { |
| BUG_ON(mddev->suspended); |
| mddev->suspended = 1; |
| synchronize_rcu(); |
| wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); |
| mddev->pers->quiesce(mddev, 1); |
| |
| del_timer_sync(&mddev->safemode_timer); |
| } |
| EXPORT_SYMBOL_GPL(mddev_suspend); |
| |
| void mddev_resume(struct mddev *mddev) |
| { |
| mddev->suspended = 0; |
| wake_up(&mddev->sb_wait); |
| mddev->pers->quiesce(mddev, 0); |
| |
| 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); |
| |
| int mddev_congested(struct mddev *mddev, int bits) |
| { |
| return mddev->suspended; |
| } |
| EXPORT_SYMBOL(mddev_congested); |
| |
| /* |
| * Generic flush handling for md |
| */ |
| |
| static void md_end_flush(struct bio *bio, int err) |
| { |
| struct md_rdev *rdev = bio->bi_private; |
| struct mddev *mddev = rdev->mddev; |
| |
| 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); |
| } |
| bio_put(bio); |
| } |
| |
| static void md_submit_flush_data(struct work_struct *ws); |
| |
| static void submit_flushes(struct work_struct *ws) |
| { |
| struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
| struct md_rdev *rdev; |
| |
| 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_mddev(GFP_NOIO, 0, mddev); |
| bi->bi_end_io = md_end_flush; |
| bi->bi_private = rdev; |
| bi->bi_bdev = rdev->bdev; |
| atomic_inc(&mddev->flush_pending); |
| submit_bio(WRITE_FLUSH, bi); |
| rcu_read_lock(); |
| rdev_dec_pending(rdev, mddev); |
| } |
| rcu_read_unlock(); |
| if (atomic_dec_and_test(&mddev->flush_pending)) |
| queue_work(md_wq, &mddev->flush_work); |
| } |
| |
| static void md_submit_flush_data(struct work_struct *ws) |
| { |
| struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
| struct bio *bio = mddev->flush_bio; |
| |
| if (bio->bi_iter.bi_size == 0) |
| /* an empty barrier - all done */ |
| bio_endio(bio, 0); |
| else { |
| bio->bi_rw &= ~REQ_FLUSH; |
| mddev->pers->make_request(mddev, bio); |
| } |
| |
| mddev->flush_bio = NULL; |
| wake_up(&mddev->sb_wait); |
| } |
| |
| void md_flush_request(struct mddev *mddev, struct bio *bio) |
| { |
| spin_lock_irq(&mddev->write_lock); |
| wait_event_lock_irq(mddev->sb_wait, |
| !mddev->flush_bio, |
| mddev->write_lock); |
| mddev->flush_bio = bio; |
| spin_unlock_irq(&mddev->write_lock); |
| |
| INIT_WORK(&mddev->flush_work, submit_flushes); |
| queue_work(md_wq, &mddev->flush_work); |
| } |
| EXPORT_SYMBOL(md_flush_request); |
| |
| void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
| { |
| struct mddev *mddev = cb->data; |
| md_wakeup_thread(mddev->thread); |
| kfree(cb); |
| } |
| EXPORT_SYMBOL(md_unplug); |
| |
| static inline struct mddev *mddev_get(struct mddev *mddev) |
| { |
| atomic_inc(&mddev->active); |
| return mddev; |
| } |
| |
| static void mddev_delayed_delete(struct work_struct *ws); |
| |
| static void mddev_put(struct mddev *mddev) |
| { |
| struct bio_set *bs = NULL; |
| |
| 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 */ |
| list_del_init(&mddev->all_mddevs); |
| bs = mddev->bio_set; |
| mddev->bio_set = NULL; |
| if (mddev->gendisk) { |
| /* We did a probe so need to clean up. 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); |
| } else |
| kfree(mddev); |
| } |
| spin_unlock(&all_mddevs_lock); |
| if (bs) |
| bioset_free(bs); |
| } |
| |
| void mddev_init(struct mddev *mddev) |
| { |
| mutex_init(&mddev->open_mutex); |
| mutex_init(&mddev->reconfig_mutex); |
| mutex_init(&mddev->bitmap_info.mutex); |
| INIT_LIST_HEAD(&mddev->disks); |
| INIT_LIST_HEAD(&mddev->all_mddevs); |
| init_timer(&mddev->safemode_timer); |
| atomic_set(&mddev->active, 1); |
| atomic_set(&mddev->openers, 0); |
| atomic_set(&mddev->active_io, 0); |
| spin_lock_init(&mddev->write_lock); |
| atomic_set(&mddev->flush_pending, 0); |
| init_waitqueue_head(&mddev->sb_wait); |
| init_waitqueue_head(&mddev->recovery_wait); |
| mddev->reshape_position = MaxSector; |
| mddev->reshape_backwards = 0; |
| mddev->last_sync_action = "none"; |
| mddev->resync_min = 0; |
| mddev->resync_max = MaxSector; |
| mddev->level = LEVEL_NONE; |
| } |
| EXPORT_SYMBOL_GPL(mddev_init); |
| |
| static struct mddev * mddev_find(dev_t unit) |
| { |
| struct mddev *mddev, *new = NULL; |
| |
| if (unit && MAJOR(unit) != MD_MAJOR) |
| unit &= ~((1<<MdpMinorShift)-1); |
| |
| retry: |
| spin_lock(&all_mddevs_lock); |
| |
| if (unit) { |
| list_for_each_entry(mddev, &all_mddevs, all_mddevs) |
| if (mddev->unit == unit) { |
| mddev_get(mddev); |
| spin_unlock(&all_mddevs_lock); |
| kfree(new); |
| return mddev; |
| } |
| |
| if (new) { |
| list_add(&new->all_mddevs, &all_mddevs); |
| spin_unlock(&all_mddevs_lock); |
| new->hold_active = UNTIL_IOCTL; |
| return new; |
| } |
| } else if (new) { |
| /* find an unused unit number */ |
| static int next_minor = 512; |
| int start = next_minor; |
| int is_free = 0; |
| int dev = 0; |
| while (!is_free) { |
| dev = MKDEV(MD_MAJOR, next_minor); |
| next_minor++; |
| if (next_minor > MINORMASK) |
| next_minor = 0; |
| if (next_minor == start) { |
| /* Oh dear, all in use. */ |
| spin_unlock(&all_mddevs_lock); |
| kfree(new); |
| return NULL; |
| } |
| |
| is_free = 1; |
| list_for_each_entry(mddev, &all_mddevs, all_mddevs) |
| if (mddev->unit == dev) { |
| is_free = 0; |
| break; |
| } |
| } |
| new->unit = dev; |
| new->md_minor = MINOR(dev); |
| new->hold_active = UNTIL_STOP; |
| list_add(&new->all_mddevs, &all_mddevs); |
| spin_unlock(&all_mddevs_lock); |
| return new; |
| } |
| spin_unlock(&all_mddevs_lock); |
| |
| new = kzalloc(sizeof(*new), GFP_KERNEL); |
| if (!new) |
| return NULL; |
| |
| new->unit = unit; |
| if (MAJOR(unit) == MD_MAJOR) |
| new->md_minor = MINOR(unit); |
| else |
| new->md_minor = MINOR(unit) >> MdpMinorShift; |
| |
| mddev_init(new); |
| |
| goto retry; |
| } |
| |
| static inline int __must_check mddev_lock(struct mddev * mddev) |
| { |
| return mutex_lock_interruptible(&mddev->reconfig_mutex); |
| } |
| |
| /* Sometimes we need to take the lock in a situation where |
| * failure due to interrupts is not acceptable. |
| */ |
| static inline void mddev_lock_nointr(struct mddev * mddev) |
| { |
| mutex_lock(&mddev->reconfig_mutex); |
| } |
| |
| static inline int mddev_is_locked(struct mddev *mddev) |
| { |
| return mutex_is_locked(&mddev->reconfig_mutex); |
| } |
| |
| static inline int mddev_trylock(struct mddev * mddev) |
| { |
| return mutex_trylock(&mddev->reconfig_mutex); |
| } |
| |
| static struct attribute_group md_redundancy_group; |
| |
| static void mddev_unlock(struct mddev * mddev) |
| { |
| if (mddev->to_remove) { |
| /* These cannot be removed under reconfig_mutex as |
| * an access to the files will try to take reconfig_mutex |
| * while holding the file unremovable, which leads to |
| * a deadlock. |
| * So hold set sysfs_active while the remove in happeing, |
| * and anything else which might set ->to_remove or my |
| * otherwise change the sysfs namespace will fail with |
| * -EBUSY if sysfs_active is still set. |
| * We set sysfs_active under reconfig_mutex and elsewhere |
| * test it under the same mutex to ensure its correct value |
| * is seen. |
| */ |
| struct attribute_group *to_remove = mddev->to_remove; |
| mddev->to_remove = NULL; |
| mddev->sysfs_active = 1; |
| mutex_unlock(&mddev->reconfig_mutex); |
| |
| if (mddev->kobj.sd) { |
| if (to_remove != &md_redundancy_group) |
| sysfs_remove_group(&mddev->kobj, to_remove); |
| if (mddev->pers == NULL || |
| mddev->pers->sync_request == NULL) { |
| sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
| if (mddev->sysfs_action) |
| sysfs_put(mddev->sysfs_action); |
| mddev->sysfs_action = NULL; |
| } |
| } |
| mddev->sysfs_active = 0; |
| } 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); |
| spin_unlock(&pers_lock); |
| } |
| |
| static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr) |
| { |
| struct md_rdev *rdev; |
| |
| rdev_for_each(rdev, mddev) |
| if (rdev->desc_nr == nr) |
| return rdev; |
| |
| return NULL; |
| } |
| |
| static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) |
| { |
| struct md_rdev *rdev; |
| |
| rdev_for_each_rcu(rdev, mddev) |
| if (rdev->desc_nr == nr) |
| return rdev; |
| |
| return NULL; |
| } |
| |
| static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) |
| { |
| struct md_rdev *rdev; |
| |
| rdev_for_each(rdev, mddev) |
| if (rdev->bdev->bd_dev == dev) |
| return rdev; |
| |
| return NULL; |
| } |
| |
| static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
| { |
| struct md_rdev *rdev; |
| |
| rdev_for_each_rcu(rdev, mddev) |
| if (rdev->bdev->bd_dev == dev) |
| return rdev; |
| |
| return NULL; |
| } |
| |
| static struct md_personality *find_pers(int level, char *clevel) |
| { |
| struct md_personality *pers; |
| list_for_each_entry(pers, &pers_list, list) { |
| if (level != LEVEL_NONE && pers->level == level) |
| return pers; |
| if (strcmp(pers->name, clevel)==0) |
| return pers; |
| } |
| return NULL; |
| } |
| |
| /* return the offset of the super block in 512byte sectors */ |
| static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
| { |
| sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
| return MD_NEW_SIZE_SECTORS(num_sectors); |
| } |
| |
| static int alloc_disk_sb(struct md_rdev * rdev) |
| { |
| if (rdev->sb_page) |
| MD_BUG(); |
| |
| rdev->sb_page = alloc_page(GFP_KERNEL); |
| if (!rdev->sb_page) { |
| printk(KERN_ALERT "md: out of memory.\n"); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| void md_rdev_clear(struct md_rdev *rdev) |
| { |
| if (rdev->sb_page) { |
| put_page(rdev->sb_page); |
| rdev->sb_loaded = 0; |
| rdev->sb_page = NULL; |
| rdev->sb_start = 0; |
| rdev->sectors = 0; |
| } |
| if (rdev->bb_page) { |
| put_page(rdev->bb_page); |
| rdev->bb_page = NULL; |
| } |
| kfree(rdev->badblocks.page); |
| rdev->badblocks.page = NULL; |
| } |
| EXPORT_SYMBOL_GPL(md_rdev_clear); |
| |
| static void super_written(struct bio *bio, int error) |
| { |
| struct md_rdev *rdev = bio->bi_private; |
| struct mddev *mddev = rdev->mddev; |
| |
| if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
| printk("md: super_written gets error=%d, uptodate=%d\n", |
| error, test_bit(BIO_UPTODATE, &bio->bi_flags)); |
| WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); |
| md_error(mddev, rdev); |
| } |
| |
| if (atomic_dec_and_test(&mddev->pending_writes)) |
| wake_up(&mddev->sb_wait); |
| bio_put(bio); |
| } |
| |
| void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
| sector_t sector, int size, struct page *page) |
| { |
| /* 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 = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
| |
| bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
| bio->bi_iter.bi_sector = sector; |
| bio_add_page(bio, page, size, 0); |
| bio->bi_private = rdev; |
| bio->bi_end_io = super_written; |
| |
| atomic_inc(&mddev->pending_writes); |
| submit_bio(WRITE_FLUSH_FUA, bio); |
| } |
| |
| void md_super_wait(struct mddev *mddev) |
| { |
| /* wait for all superblock writes that were scheduled to complete */ |
| DEFINE_WAIT(wq); |
| for(;;) { |
| prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); |
| if (atomic_read(&mddev->pending_writes)==0) |
| break; |
| schedule(); |
| } |
| finish_wait(&mddev->sb_wait, &wq); |
| } |
| |
| int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
| struct page *page, int rw, bool metadata_op) |
| { |
| struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
| int ret; |
| |
| bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
| rdev->meta_bdev : rdev->bdev; |
| if (metadata_op) |
| bio->bi_iter.bi_sector = sector + rdev->sb_start; |
| else if (rdev->mddev->reshape_position != MaxSector && |
| (rdev->mddev->reshape_backwards == |
| (sector >= rdev->mddev->reshape_position))) |
| bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
| else |
| bio->bi_iter.bi_sector = sector + rdev->data_offset; |
| bio_add_page(bio, page, size, 0); |
| submit_bio_wait(rw, bio); |
| |
| ret = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| bio_put(bio); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(sync_page_io); |
| |
| static int read_disk_sb(struct md_rdev * rdev, int size) |
| { |
| char b[BDEVNAME_SIZE]; |
| if (!rdev->sb_page) { |
| MD_BUG(); |
| return -EINVAL; |
| } |
| if (rdev->sb_loaded) |
| return 0; |
| |
| |
| if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
| goto fail; |
| rdev->sb_loaded = 1; |
| return 0; |
| |
| fail: |
| printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", |
| bdevname(rdev->bdev,b)); |
| return -EINVAL; |
| } |
| |
| static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
| { |
| return sb1->set_uuid0 == sb2->set_uuid0 && |
| sb1->set_uuid1 == sb2->set_uuid1 && |
| sb1->set_uuid2 == sb2->set_uuid2 && |
| sb1->set_uuid3 == sb2->set_uuid3; |
| } |
| |
| static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
| { |
| int ret; |
| mdp_super_t *tmp1, *tmp2; |
| |
| tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); |
| tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); |
| |
| if (!tmp1 || !tmp2) { |
| ret = 0; |
| printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
| goto abort; |
| } |
| |
| *tmp1 = *sb1; |
| *tmp2 = *sb2; |
| |
| /* |
| * nr_disks is not constant |
| */ |
| tmp1->nr_disks = 0; |
| tmp2->nr_disks = 0; |
| |
| ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
| abort: |
| kfree(tmp1); |
| kfree(tmp2); |
| return ret; |
| } |
| |
| |
| static u32 md_csum_fold(u32 csum) |
| { |
| csum = (csum & 0xffff) + (csum >> 16); |
| return (csum & 0xffff) + (csum >> 16); |
| } |
| |
| static unsigned int calc_sb_csum(mdp_super_t * sb) |
| { |
| u64 newcsum = 0; |
| u32 *sb32 = (u32*)sb; |
| int i; |
| unsigned int disk_csum, csum; |
| |
| disk_csum = sb->sb_csum; |
| sb->sb_csum = 0; |
| |
| for (i = 0; i < MD_SB_BYTES/4 ; i++) |
| newcsum += sb32[i]; |
| csum = (newcsum & 0xffffffff) + (newcsum>>32); |
| |
| |
| #ifdef CONFIG_ALPHA |
| /* This used to use csum_partial, which was wrong for several |
| * reasons including that different results are returned on |
| * different architectures. It isn't critical that we get exactly |
| * the same return value as before (we always csum_fold before |
| * testing, and that removes any differences). However as we |
| * know that csum_partial always returned a 16bit value on |
| * alphas, do a fold to maximise conformity to previous behaviour. |
| */ |
| sb->sb_csum = md_csum_fold(disk_csum); |
| #else |
| sb->sb_csum = disk_csum; |
| #endif |
| return csum; |
| } |
| |
| |
| /* |
| * Handle superblock details. |
| * We want to be able to handle multiple superblock formats |
| * so we have a common interface to them all, and an array of |
| * different handlers. |
| * We rely on user-space to write the initial superblock, and support |
| * reading and updating of superblocks. |
| * Interface methods are: |
| * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
| * loads and validates a superblock on dev. |
| * if refdev != NULL, compare superblocks on both devices |
| * Return: |
| * 0 - dev has a superblock that is compatible with refdev |
| * 1 - dev has a superblock that is compatible and newer than refdev |
| * so dev should be used as the refdev in future |
| * -EINVAL superblock incompatible or invalid |
| * -othererror e.g. -EIO |
| * |
| * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
| * Verify that dev is acceptable into mddev. |
| * The first time, mddev->raid_disks will be 0, and data from |
| * dev should be merged in. Subsequent calls check that dev |
| * is new enough. Return 0 or -EINVAL |
| * |
| * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
| * Update the superblock for rdev with data in mddev |
| * This does not write to disc. |
| * |
| */ |
| |
| struct super_type { |
| char *name; |
| struct module *owner; |
| int (*load_super)(struct md_rdev *rdev, |
| struct md_rdev *refdev, |
| int minor_version); |
| int (*validate_super)(struct mddev *mddev, |
| struct md_rdev *rdev); |
| void (*sync_super)(struct mddev *mddev, |
| struct md_rdev *rdev); |
| unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
| sector_t num_sectors); |
| int (*allow_new_offset)(struct md_rdev *rdev, |
| unsigned long long new_offset); |
| }; |
| |
| /* |
| * Check that the given mddev has no bitmap. |
| * |
| * This function is called from the run method of all personalities that do not |
| * support bitmaps. It prints an error message and returns non-zero if mddev |
| * has a bitmap. Otherwise, it returns 0. |
| * |
| */ |
| int md_check_no_bitmap(struct mddev *mddev) |
| { |
| if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
| return 0; |
| printk(KERN_ERR "%s: bitmaps are not supported for %s\n", |
| mdname(mddev), mddev->pers->name); |
| return 1; |
| } |
| EXPORT_SYMBOL(md_check_no_bitmap); |
| |
| /* |
| * load_super for 0.90.0 |
| */ |
| static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
| { |
| char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| mdp_super_t *sb; |
| int ret; |
| |
| /* |
| * Calculate the position of the superblock (512byte sectors), |
| * it's at the end of the disk. |
| * |
| * It also happens to be a multiple of 4Kb. |
| */ |
| rdev->sb_start = calc_dev_sboffset(rdev); |
| |
| ret = read_disk_sb(rdev, MD_SB_BYTES); |
| if (ret) return ret; |
| |
| ret = -EINVAL; |
| |
| bdevname(rdev->bdev, b); |
| sb = page_address(rdev->sb_page); |
| |
| if (sb->md_magic != MD_SB_MAGIC) { |
| printk(KERN_ERR "md: invalid raid superblock magic on %s\n", |
| b); |
| goto abort; |
| } |
| |
| if (sb->major_version != 0 || |
| sb->minor_version < 90 || |
| sb->minor_version > 91) { |
| printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
| sb->major_version, sb->minor_version, |
| b); |
| goto abort; |
| } |
| |
| if (sb->raid_disks <= 0) |
| goto abort; |
| |
| if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
| printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
| b); |
| goto abort; |
| } |
| |
| rdev->preferred_minor = sb->md_minor; |
| rdev->data_offset = 0; |
| rdev->new_data_offset = 0; |
| rdev->sb_size = MD_SB_BYTES; |
| rdev->badblocks.shift = -1; |
| |
| if (sb->level == LEVEL_MULTIPATH) |
| rdev->desc_nr = -1; |
| else |
| rdev->desc_nr = sb->this_disk.number; |
| |
| if (!refdev) { |
| ret = 1; |
| } else { |
| __u64 ev1, ev2; |
| mdp_super_t *refsb = page_address(refdev->sb_page); |
| if (!uuid_equal(refsb, sb)) { |
| printk(KERN_WARNING "md: %s has different UUID to %s\n", |
| b, bdevname(refdev->bdev,b2)); |
| goto abort; |
| } |
| if (!sb_equal(refsb, sb)) { |
| printk(KERN_WARNING "md: %s has same UUID" |
| " but different superblock to %s\n", |
| b, bdevname(refdev->bdev, b2)); |
| goto abort; |
| } |
| ev1 = md_event(sb); |
| ev2 = md_event(refsb); |
| if (ev1 > ev2) |
| ret = 1; |
| else |
| ret = 0; |
| } |
| rdev->sectors = rdev->sb_start; |
| /* Limit to 4TB as metadata cannot record more than that. |
| * (not needed for Linear and RAID0 as metadata doesn't |
| * record this size) |
| */ |
| if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) |
| rdev->sectors = (2ULL << 32) - 2; |
| |
| if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
| /* "this cannot possibly happen" ... */ |
| ret = -EINVAL; |
| |
| abort: |
| return ret; |
| } |
| |
| /* |
| * validate_super for 0.90.0 |
| */ |
| static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| mdp_disk_t *desc; |
| mdp_super_t *sb = page_address(rdev->sb_page); |
| __u64 ev1 = md_event(sb); |
| |
| rdev->raid_disk = -1; |
| clear_bit(Faulty, &rdev->flags); |
| clear_bit(In_sync, &rdev->flags); |
| clear_bit(Bitmap_sync, &rdev->flags); |
| clear_bit(WriteMostly, &rdev->flags); |
| |
| if (mddev->raid_disks == 0) { |
| mddev->major_version = 0; |
| mddev->minor_version = sb->minor_version; |
| mddev->patch_version = sb->patch_version; |
| mddev->external = 0; |
| mddev->chunk_sectors = sb->chunk_size >> 9; |
| mddev->ctime = sb->ctime; |
| mddev->utime = sb->utime; |
| mddev->level = sb->level; |
| mddev->clevel[0] = 0; |
| mddev->layout = sb->layout; |
| mddev->raid_disks = sb->raid_disks; |
| mddev->dev_sectors = ((sector_t)sb->size) * 2; |
| mddev->events = ev1; |
| mddev->bitmap_info.offset = 0; |
| mddev->bitmap_info.space = 0; |
| /* bitmap can use 60 K after the 4K superblocks */ |
| mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
| mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
| mddev->reshape_backwards = 0; |
| |
| if (mddev->minor_version >= 91) { |
| mddev->reshape_position = sb->reshape_position; |
| mddev->delta_disks = sb->delta_disks; |
| mddev->new_level = sb->new_level; |
| mddev->new_layout = sb->new_layout; |
| mddev->new_chunk_sectors = sb->new_chunk >> 9; |
| if (mddev->delta_disks < 0) |
| mddev->reshape_backwards = 1; |
| } else { |
| mddev->reshape_position = MaxSector; |
| mddev->delta_disks = 0; |
| mddev->new_level = mddev->level; |
| mddev->new_layout = mddev->layout; |
| mddev->new_chunk_sectors = mddev->chunk_sectors; |
| } |
| |
| if (sb->state & (1<<MD_SB_CLEAN)) |
| mddev->recovery_cp = MaxSector; |
| else { |
| if (sb->events_hi == sb->cp_events_hi && |
| sb->events_lo == sb->cp_events_lo) { |
| mddev->recovery_cp = sb->recovery_cp; |
| } else |
| mddev->recovery_cp = 0; |
| } |
| |
| memcpy(mddev->uuid+0, &sb->set_uuid0, 4); |
| memcpy(mddev->uuid+4, &sb->set_uuid1, 4); |
| memcpy(mddev->uuid+8, &sb->set_uuid2, 4); |
| memcpy(mddev->uuid+12,&sb->set_uuid3, 4); |
| |
| mddev->max_disks = MD_SB_DISKS; |
| |
| if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && |
| mddev->bitmap_info.file == NULL) { |
| mddev->bitmap_info.offset = |
| mddev->bitmap_info.default_offset; |
| mddev->bitmap_info.space = |
| mddev->bitmap_info.default_space; |
| } |
| |
| } else if (mddev->pers == NULL) { |
| /* Insist on good event counter while assembling, except |
| * for spares (which don't need an event count) */ |
| ++ev1; |
| if (sb->disks[rdev->desc_nr].state & ( |
| (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) |
| if (ev1 < mddev->events) |
| return -EINVAL; |
| } else if (mddev->bitmap) { |
| /* if adding to array with a bitmap, then we can accept an |
| * older device ... but not too old. |
| */ |
| if (ev1 < mddev->bitmap->events_cleared) |
| return 0; |
| if (ev1 < mddev->events) |
| set_bit(Bitmap_sync, &rdev->flags); |
| } else { |
| if (ev1 < mddev->events) |
| /* just a hot-add of a new device, leave raid_disk at -1 */ |
| return 0; |
| } |
| |
| if (mddev->level != LEVEL_MULTIPATH) { |
| desc = sb->disks + rdev->desc_nr; |
| |
| if (desc->state & (1<<MD_DISK_FAULTY)) |
| set_bit(Faulty, &rdev->flags); |
| else if (desc->state & (1<<MD_DISK_SYNC) /* && |
| desc->raid_disk < mddev->raid_disks */) { |
| 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; |
| } |
| } |
| if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
| set_bit(WriteMostly, &rdev->flags); |
| } else /* MULTIPATH are always insync */ |
| set_bit(In_sync, &rdev->flags); |
| return 0; |
| } |
| |
| /* |
| * sync_super for 0.90.0 |
| */ |
| static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| mdp_super_t *sb; |
| struct md_rdev *rdev2; |
| int next_spare = mddev->raid_disks; |
| |
| |
| /* make rdev->sb match mddev data.. |
| * |
| * 1/ zero out disks |
| * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); |
| * 3/ any empty disks < next_spare become removed |
| * |
| * disks[0] gets initialised to REMOVED because |
| * we cannot be sure from other fields if it has |
| * been initialised or not. |
| */ |
| int i; |
| int active=0, working=0,failed=0,spare=0,nr_disks=0; |
| |
| rdev->sb_size = MD_SB_BYTES; |
| |
| sb = page_address(rdev->sb_page); |
| |
| memset(sb, 0, sizeof(*sb)); |
| |
| sb->md_magic = MD_SB_MAGIC; |
| sb->major_version = mddev->major_version; |
| sb->patch_version = mddev->patch_version; |
| sb->gvalid_words = 0; /* ignored */ |
| memcpy(&sb->set_uuid0, mddev->uuid+0, 4); |
| memcpy(&sb->set_uuid1, mddev->uuid+4, 4); |
| memcpy(&sb->set_uuid2, mddev->uuid+8, 4); |
| memcpy(&sb->set_uuid3, mddev->uuid+12,4); |
| |
| sb->ctime = mddev->ctime; |
| sb->level = mddev->level; |
| sb->size = mddev->dev_sectors / 2; |
| sb->raid_disks = mddev->raid_disks; |
| sb->md_minor = mddev->md_minor; |
| sb->not_persistent = 0; |
| sb->utime = mddev->utime; |
| sb->state = 0; |
| sb->events_hi = (mddev->events>>32); |
| sb->events_lo = (u32)mddev->events; |
| |
| if (mddev->reshape_position == MaxSector) |
| sb->minor_version = 90; |
| else { |
| sb->minor_version = 91; |
| sb->reshape_position = mddev->reshape_position; |
| sb->new_level = mddev->new_level; |
| sb->delta_disks = mddev->delta_disks; |
| sb->new_layout = mddev->new_layout; |
| sb->new_chunk = mddev->new_chunk_sectors << 9; |
| } |
| mddev->minor_version = sb->minor_version; |
| if (mddev->in_sync) |
| { |
| sb->recovery_cp = mddev->recovery_cp; |
| sb->cp_events_hi = (mddev->events>>32); |
| sb->cp_events_lo = (u32)mddev->events; |
| if (mddev->recovery_cp == MaxSector) |
| sb->state = (1<< MD_SB_CLEAN); |
| } else |
| sb->recovery_cp = 0; |
| |
| sb->layout = mddev->layout; |
| sb->chunk_size = mddev->chunk_sectors << 9; |
| |
| if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
| sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
| |
| sb->disks[0].state = (1<<MD_DISK_REMOVED); |
| rdev_for_each(rdev2, mddev) { |
| mdp_disk_t *d; |
| int desc_nr; |
| int is_active = test_bit(In_sync, &rdev2->flags); |
| |
| if (rdev2->raid_disk >= 0 && |
| sb->minor_version >= 91) |
| /* we have nowhere to store the recovery_offset, |
| * but if it is not below the reshape_position, |
| * we can piggy-back on that. |
| */ |
| is_active = 1; |
| if (rdev2->raid_disk < 0 || |
| test_bit(Faulty, &rdev2->flags)) |
| is_active = 0; |
| if (is_active) |
| desc_nr = rdev2->raid_disk; |
| else |
| desc_nr = next_spare++; |
| rdev2->desc_nr = desc_nr; |
| d = &sb->disks[rdev2->desc_nr]; |
| nr_disks++; |
| d->number = rdev2->desc_nr; |
| d->major = MAJOR(rdev2->bdev->bd_dev); |
| d->minor = MINOR(rdev2->bdev->bd_dev); |
| if (is_active) |
| d->raid_disk = rdev2->raid_disk; |
| else |
| d->raid_disk = rdev2->desc_nr; /* compatibility */ |
| if (test_bit(Faulty, &rdev2->flags)) |
| d->state = (1<<MD_DISK_FAULTY); |
| else if (is_active) { |
| d->state = (1<<MD_DISK_ACTIVE); |
| if (test_bit(In_sync, &rdev2->flags)) |
| d->state |= (1<<MD_DISK_SYNC); |
| active++; |
| working++; |
| } else { |
| d->state = 0; |
| spare++; |
| working++; |
| } |
| if (test_bit(WriteMostly, &rdev2->flags)) |
| d->state |= (1<<MD_DISK_WRITEMOSTLY); |
| } |
| /* now set the "removed" and "faulty" bits on any missing devices */ |
| for (i=0 ; i < mddev->raid_disks ; i++) { |
| mdp_disk_t *d = &sb->disks[i]; |
| if (d->state == 0 && d->number == 0) { |
| d->number = i; |
| d->raid_disk = i; |
| d->state = (1<<MD_DISK_REMOVED); |
| d->state |= (1<<MD_DISK_FAULTY); |
| failed++; |
| } |
| } |
| sb->nr_disks = nr_disks; |
| sb->active_disks = active; |
| sb->working_disks = working; |
| sb->failed_disks = failed; |
| sb->spare_disks = spare; |
| |
| sb->this_disk = sb->disks[rdev->desc_nr]; |
| sb->sb_csum = calc_sb_csum(sb); |
| } |
| |
| /* |
| * rdev_size_change for 0.90.0 |
| */ |
| static unsigned long long |
| super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
| { |
| if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
| return 0; /* component must fit device */ |
| if (rdev->mddev->bitmap_info.offset) |
| return 0; /* can't move bitmap */ |
| rdev->sb_start = calc_dev_sboffset(rdev); |
| if (!num_sectors || num_sectors > rdev->sb_start) |
| num_sectors = rdev->sb_start; |
| /* Limit to 4TB as metadata cannot record more than that. |
| * 4TB == 2^32 KB, or 2*2^32 sectors. |
| */ |
| if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
| num_sectors = (2ULL << 32) - 2; |
| md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
| rdev->sb_page); |
| md_super_wait(rdev->mddev); |
| return num_sectors; |
| } |
| |
| static int |
| super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) |
| { |
| /* non-zero offset changes not possible with v0.90 */ |
| return new_offset == 0; |
| } |
| |
| /* |
| * version 1 superblock |
| */ |
| |
| static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
| { |
| __le32 disk_csum; |
| u32 csum; |
| unsigned long long newcsum; |
| int size = 256 + le32_to_cpu(sb->max_dev)*2; |
| __le32 *isuper = (__le32*)sb; |
| |
| disk_csum = sb->sb_csum; |
| sb->sb_csum = 0; |
| newcsum = 0; |
| for (; size >= 4; size -= 4) |
| newcsum += le32_to_cpu(*isuper++); |
| |
| if (size == 2) |
| newcsum += le16_to_cpu(*(__le16*) isuper); |
| |
| csum = (newcsum & 0xffffffff) + (newcsum >> 32); |
| sb->sb_csum = disk_csum; |
| return cpu_to_le32(csum); |
| } |
| |
| static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
| int acknowledged); |
| static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
| { |
| struct mdp_superblock_1 *sb; |
| int ret; |
| sector_t sb_start; |
| sector_t sectors; |
| char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| int bmask; |
| |
| /* |
| * Calculate the position of the superblock in 512byte sectors. |
| * It is always aligned to a 4K boundary and |
| * depeding on minor_version, it can be: |
| * 0: At least 8K, but less than 12K, from end of device |
| * 1: At start of device |
| * 2: 4K from start of device. |
| */ |
| switch(minor_version) { |
| case 0: |
| sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
| sb_start -= 8*2; |
| sb_start &= ~(sector_t)(4*2-1); |
| break; |
| case 1: |
| sb_start = 0; |
| break; |
| case 2: |
| sb_start = 8; |
| break; |
| default: |
| return -EINVAL; |
| } |
| rdev->sb_start = sb_start; |
| |
| /* superblock is rarely larger than 1K, but it can be larger, |
| * and it is safe to read 4k, so we do that |
| */ |
| ret = read_disk_sb(rdev, 4096); |
| if (ret) return ret; |
| |
| |
| sb = page_address(rdev->sb_page); |
| |
| if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || |
| sb->major_version != cpu_to_le32(1) || |
| le32_to_cpu(sb->max_dev) > (4096-256)/2 || |
| le64_to_cpu(sb->super_offset) != rdev->sb_start || |
| (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
| return -EINVAL; |
| |
| if (calc_sb_1_csum(sb) != sb->sb_csum) { |
| printk("md: invalid superblock checksum on %s\n", |
| bdevname(rdev->bdev,b)); |
| return -EINVAL; |
| } |
| if (le64_to_cpu(sb->data_size) < 10) { |
| printk("md: data_size too small on %s\n", |
| bdevname(rdev->bdev,b)); |
| return -EINVAL; |
| } |
| 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; |
| |
| rdev->preferred_minor = 0xffff; |
| rdev->data_offset = le64_to_cpu(sb->data_offset); |
| rdev->new_data_offset = rdev->data_offset; |
| if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && |
| (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) |
| rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); |
| atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
| |
| rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
| bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
| if (rdev->sb_size & bmask) |
| rdev->sb_size = (rdev->sb_size | bmask) + 1; |
| |
| if (minor_version |
| && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
| return -EINVAL; |
| if (minor_version |
| && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) |
| return -EINVAL; |
| |
| if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
| rdev->desc_nr = -1; |
| else |
| rdev->desc_nr = le32_to_cpu(sb->dev_number); |
| |
| if (!rdev->bb_page) { |
| rdev->bb_page = alloc_page(GFP_KERNEL); |
| if (!rdev->bb_page) |
| return -ENOMEM; |
| } |
| if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && |
| rdev->badblocks.count == 0) { |
| /* need to load the bad block list. |
| * Currently we limit it to one page. |
| */ |
| s32 offset; |
| sector_t bb_sector; |
| u64 *bbp; |
| int i; |
| int sectors = le16_to_cpu(sb->bblog_size); |
| if (sectors > (PAGE_SIZE / 512)) |
| return -EINVAL; |
| offset = le32_to_cpu(sb->bblog_offset); |
| if (offset == 0) |
| return -EINVAL; |
| bb_sector = (long long)offset; |
| if (!sync_page_io(rdev, bb_sector, sectors << 9, |
| rdev->bb_page, READ, true)) |
| return -EIO; |
| bbp = (u64 *)page_address(rdev->bb_page); |
| rdev->badblocks.shift = sb->bblog_shift; |
| for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { |
| u64 bb = le64_to_cpu(*bbp); |
| int count = bb & (0x3ff); |
| u64 sector = bb >> 10; |
| sector <<= sb->bblog_shift; |
| count <<= sb->bblog_shift; |
| if (bb + 1 == 0) |
| break; |
| if (md_set_badblocks(&rdev->badblocks, |
| sector, count, 1) == 0) |
| return -EINVAL; |
| } |
| } else if (sb->bblog_offset != 0) |
| rdev->badblocks.shift = 0; |
| |
| if (!refdev) { |
| ret = 1; |
| } else { |
| __u64 ev1, ev2; |
| struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
| |
| if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || |
| sb->level != refsb->level || |
| sb->layout != refsb->layout || |
| sb->chunksize != refsb->chunksize) { |
| printk(KERN_WARNING "md: %s has strangely different" |
| " superblock to %s\n", |
| bdevname(rdev->bdev,b), |
| bdevname(refdev->bdev,b2)); |
| return -EINVAL; |
| } |
| ev1 = le64_to_cpu(sb->events); |
| ev2 = le64_to_cpu(refsb->events); |
| |
| if (ev1 > ev2) |
| ret = 1; |
| else |
| ret = 0; |
| } |
| if (minor_version) { |
| sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); |
| sectors -= rdev->data_offset; |
| } else |
| sectors = rdev->sb_start; |
| if (sectors < le64_to_cpu(sb->data_size)) |
| return -EINVAL; |
| rdev->sectors = le64_to_cpu(sb->data_size); |
| return ret; |
| } |
| |
| static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
| __u64 ev1 = le64_to_cpu(sb->events); |
| |
| rdev->raid_disk = -1; |
| clear_bit(Faulty, &rdev->flags); |
| clear_bit(In_sync, &rdev->flags); |
| clear_bit(Bitmap_sync, &rdev->flags); |
| clear_bit(WriteMostly, &rdev->flags); |
| |
| if (mddev->raid_disks == 0) { |
| mddev->major_version = 1; |
| mddev->patch_version = 0; |
| mddev->external = 0; |
| mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
| mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
| mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); |
| mddev->level = le32_to_cpu(sb->level); |
| mddev->clevel[0] = 0; |
| mddev->layout = le32_to_cpu(sb->layout); |
| mddev->raid_disks = le32_to_cpu(sb->raid_disks); |
| mddev->dev_sectors = le64_to_cpu(sb->size); |
| mddev->events = ev1; |
| mddev->bitmap_info.offset = 0; |
| mddev->bitmap_info.space = 0; |
| /* Default location for bitmap is 1K after superblock |
| * using 3K - total of 4K |
| */ |
| mddev->bitmap_info.default_offset = 1024 >> 9; |
| mddev->bitmap_info.default_space = (4096-1024) >> 9; |
| mddev->reshape_backwards = 0; |
| |
| mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
| memcpy(mddev->uuid, sb->set_uuid, 16); |
| |
| mddev->max_disks = (4096-256)/2; |
| |
| if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
| mddev->bitmap_info.file == NULL) { |
| mddev->bitmap_info.offset = |
| (__s32)le32_to_cpu(sb->bitmap_offset); |
| /* Metadata doesn't record how much space is available. |
| * For 1.0, we assume we can use up to the superblock |
| * if before, else to 4K beyond superblock. |
| * For others, assume no change is possible. |
| */ |
| if (mddev->minor_version > 0) |
| mddev->bitmap_info.space = 0; |
| else if (mddev->bitmap_info.offset > 0) |
| mddev->bitmap_info.space = |
| 8 - mddev->bitmap_info.offset; |
| else |
| mddev->bitmap_info.space = |
| -mddev->bitmap_info.offset; |
| } |
| |
| if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
| mddev->reshape_position = le64_to_cpu(sb->reshape_position); |
| mddev->delta_disks = le32_to_cpu(sb->delta_disks); |
| mddev->new_level = le32_to_cpu(sb->new_level); |
| mddev->new_layout = le32_to_cpu(sb->new_layout); |
| mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
| if (mddev->delta_disks < 0 || |
| (mddev->delta_disks == 0 && |
| (le32_to_cpu(sb->feature_map) |
| & MD_FEATURE_RESHAPE_BACKWARDS))) |
| mddev->reshape_backwards = 1; |
| } else { |
| mddev->reshape_position = MaxSector; |
| mddev->delta_disks = 0; |
| mddev->new_level = mddev->level; |
| mddev->new_layout = mddev->layout; |
| mddev->new_chunk_sectors = mddev->chunk_sectors; |
| } |
| |
| } else if (mddev->pers == NULL) { |
| /* Insist of good event counter while assembling, except for |
| * spares (which don't need an event count) */ |
| ++ev1; |
| if (rdev->desc_nr >= 0 && |
| rdev->desc_nr < le32_to_cpu(sb->max_dev) && |
| le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) |
| if (ev1 < 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) |
| return 0; |
| if (ev1 < mddev->events) |
| set_bit(Bitmap_sync, &rdev->flags); |
| } else { |
| if (ev1 < mddev->events) |
| /* 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 = 0xffff; |
| rdev->desc_nr = -1; |
| } else |
| role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
| switch(role) { |
| case 0xffff: /* spare */ |
| break; |
| case 0xfffe: /* faulty */ |
| set_bit(Faulty, &rdev->flags); |
| 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 |
| set_bit(In_sync, &rdev->flags); |
| rdev->raid_disk = role; |
| break; |
| } |
| if (sb->devflags & WriteMostly1) |
| set_bit(WriteMostly, &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); |
| |
| return 0; |
| } |
| |
| static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| struct mdp_superblock_1 *sb; |
| struct md_rdev *rdev2; |
| int max_dev, i; |
| /* make rdev->sb match mddev and rdev data. */ |
| |
| sb = page_address(rdev->sb_page); |
| |
| sb->feature_map = 0; |
| sb->pad0 = 0; |
| sb->recovery_offset = cpu_to_le64(0); |
| memset(sb->pad3, 0, sizeof(sb->pad3)); |
| |
| sb->utime = cpu_to_le64((__u64)mddev->utime); |
| sb->events = cpu_to_le64(mddev->events); |
| if (mddev->in_sync) |
| sb->resync_offset = cpu_to_le64(mddev->recovery_cp); |
| else |
| sb->resync_offset = cpu_to_le64(0); |
| |
| sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
| |
| sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
| sb->size = cpu_to_le64(mddev->dev_sectors); |
| sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
| sb->level = cpu_to_le32(mddev->level); |
| sb->layout = cpu_to_le32(mddev->layout); |
| |
| if (test_bit(WriteMostly, &rdev->flags)) |
| sb->devflags |= WriteMostly1; |
| else |
| sb->devflags &= ~WriteMostly1; |
| sb->data_offset = cpu_to_le64(rdev->data_offset); |
| sb->data_size = cpu_to_le64(rdev->sectors); |
| |
| if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
| sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); |
| sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
| } |
| |
| if (rdev->raid_disk >= 0 && |
| !test_bit(In_sync, &rdev->flags)) { |
| sb->feature_map |= |
| cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); |
| sb->recovery_offset = |
| cpu_to_le64(rdev->recovery_offset); |
| if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
| sb->feature_map |= |
| cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); |
| } |
| if (test_bit(Replacement, &rdev->flags)) |
| sb->feature_map |= |
| cpu_to_le32(MD_FEATURE_REPLACEMENT); |
| |
| if (mddev->reshape_position != MaxSector) { |
| sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); |
| sb->reshape_position = cpu_to_le64(mddev->reshape_position); |
| sb->new_layout = cpu_to_le32(mddev->new_layout); |
| sb->delta_disks = cpu_to_le32(mddev->delta_disks); |
| sb->new_level = cpu_to_le32(mddev->new_level); |
| sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
| if (mddev->delta_disks == 0 && |
| mddev->reshape_backwards) |
| sb->feature_map |
| |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); |
| if (rdev->new_data_offset != rdev->data_offset) { |
| sb->feature_map |
| |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); |
| sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset |
| - rdev->data_offset)); |
| } |
| } |
| |
| if (rdev->badblocks.count == 0) |
| /* Nothing to do for bad blocks*/ ; |
| else if (sb->bblog_offset == 0) |
| /* Cannot record bad blocks on this device */ |
| md_error(mddev, rdev); |
| else { |
| struct badblocks *bb = &rdev->badblocks; |
| u64 *bbp = (u64 *)page_address(rdev->bb_page); |
| u64 *p = bb->page; |
| sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); |
| if (bb->changed) { |
| unsigned seq; |
| |
| retry: |
| seq = read_seqbegin(&bb->lock); |
| |
| memset(bbp, 0xff, PAGE_SIZE); |
| |
| for (i = 0 ; i < bb->count ; i++) { |
| u64 internal_bb = p[i]; |
| u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
| | BB_LEN(internal_bb)); |
| bbp[i] = cpu_to_le64(store_bb); |
| } |
| bb->changed = 0; |
| if (read_seqretry(&bb->lock, seq)) |
| goto retry; |
| |
| bb->sector = (rdev->sb_start + |
| (int)le32_to_cpu(sb->bblog_offset)); |
| bb->size = le16_to_cpu(sb->bblog_size); |
| } |
| } |
| |
| max_dev = 0; |
| rdev_for_each(rdev2, mddev) |
| if (rdev2->desc_nr+1 > max_dev) |
| max_dev = rdev2->desc_nr+1; |
| |
| if (max_dev > le32_to_cpu(sb->max_dev)) { |
| int bmask; |
| sb->max_dev = cpu_to_le32(max_dev); |
| rdev->sb_size = max_dev * 2 + 256; |
| bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
| if (rdev->sb_size & bmask) |
| rdev->sb_size = (rdev->sb_size | bmask) + 1; |
| } else |
| max_dev = le32_to_cpu(sb->max_dev); |
| |
| for (i=0; i<max_dev;i++) |
| sb->dev_roles[i] = cpu_to_le16(0xfffe); |
| |
| rdev_for_each(rdev2, mddev) { |
| i = rdev2->desc_nr; |
| if (test_bit(Faulty, &rdev2->flags)) |
| sb->dev_roles[i] = cpu_to_le16(0xfffe); |
| else if (test_bit(In_sync, &rdev2->flags)) |
| sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
| else if (rdev2->raid_disk >= 0) |
| sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
| else |
| sb->dev_roles[i] = cpu_to_le16(0xffff); |
| } |
| |
| sb->sb_csum = calc_sb_1_csum(sb); |
| } |
| |
| static unsigned long long |
| super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
| { |
| struct mdp_superblock_1 *sb; |
| sector_t max_sectors; |
| if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
| return 0; /* component must fit device */ |
| if (rdev->data_offset != rdev->new_data_offset) |
| return 0; /* too confusing */ |
| if (rdev->sb_start < rdev->data_offset) { |
| /* minor versions 1 and 2; superblock before data */ |
| max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
| max_sectors -= rdev->data_offset; |
| if (!num_sectors || num_sectors > max_sectors) |
| num_sectors = max_sectors; |
| } else if (rdev->mddev->bitmap_info.offset) { |
| /* minor version 0 with bitmap we can't move */ |
| return 0; |
| } else { |
| /* minor version 0; superblock after data */ |
| sector_t sb_start; |
| sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
| sb_start &= ~(sector_t)(4*2 - 1); |
| max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
| if (!num_sectors || num_sectors > max_sectors) |
| num_sectors = max_sectors; |
| rdev->sb_start = sb_start; |
| } |
| sb = page_address(rdev->sb_page); |
| sb->data_size = cpu_to_le64(num_sectors); |
| sb->super_offset = rdev->sb_start; |
| sb->sb_csum = calc_sb_1_csum(sb); |
| md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
| rdev->sb_page); |
| md_super_wait(rdev->mddev); |
| return num_sectors; |
| |
| } |
| |
| static int |
| super_1_allow_new_offset(struct md_rdev *rdev, |
| unsigned long long new_offset) |
| { |
| /* 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) |
| return 1; |
| |
| /* otherwise we must be sure not to step on |
| * any metadata, so stay: |
| * 36K beyond start of superblock |
| * beyond end of badblocks |
| * beyond write-intent bitmap |
| */ |
| if (rdev->sb_start + (32+4)*2 > new_offset) |
| return 0; |
| bitmap = rdev->mddev->bitmap; |
| if (bitmap && !rdev->mddev->bitmap_info.file && |
| rdev->sb_start + rdev->mddev->bitmap_info.offset + |
| bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
| return 0; |
| if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) |
| return 0; |
| |
| return 1; |
| } |
| |
| static struct super_type super_types[] = { |
| [0] = { |
| .name = "0.90.0", |
| .owner = THIS_MODULE, |
| .load_super = super_90_load, |
| .validate_super = super_90_validate, |
| .sync_super = super_90_sync, |
| .rdev_size_change = super_90_rdev_size_change, |
| .allow_new_offset = super_90_allow_new_offset, |
| }, |
| [1] = { |
| .name = "md-1", |
| .owner = THIS_MODULE, |
| .load_super = super_1_load, |
| .validate_super = super_1_validate, |
| .sync_super = super_1_sync, |
| .rdev_size_change = super_1_rdev_size_change, |
| .allow_new_offset = super_1_allow_new_offset, |
| }, |
| }; |
| |
| static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| if (mddev->sync_super) { |
| mddev->sync_super(mddev, rdev); |
| return; |
| } |
| |
| BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); |
| |
| super_types[mddev->major_version].sync_super(mddev, rdev); |
| } |
| |
| static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
| { |
| struct md_rdev *rdev, *rdev2; |
| |
| rcu_read_lock(); |
| rdev_for_each_rcu(rdev, mddev1) |
| rdev_for_each_rcu(rdev2, mddev2) |
| if (rdev->bdev->bd_contains == |
| rdev2->bdev->bd_contains) { |
| rcu_read_unlock(); |
| return 1; |
| } |
| rcu_read_unlock(); |
| return 0; |
| } |
| |
| static LIST_HEAD(pending_raid_disks); |
| |
| /* |
| * Try to register data integrity profile for an mddev |
| * |
| * This is called when an array is started and after a disk has been kicked |
| * from the array. It only succeeds if all working and active component devices |
| * are integrity capable with matching profiles. |
| */ |
| 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. |
| */ |
| if (blk_integrity_register(mddev->gendisk, |
| bdev_get_integrity(reference->bdev)) != 0) { |
| printk(KERN_ERR "md: failed to register integrity for %s\n", |
| mdname(mddev)); |
| return -EINVAL; |
| } |
| printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
| if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { |
| printk(KERN_ERR "md: failed to create integrity pool for %s\n", |
| mdname(mddev)); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(md_integrity_register); |
| |
| /* Disable data integrity if non-capable/non-matching disk is being added */ |
| void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
| { |
| struct blk_integrity *bi_rdev; |
| struct blk_integrity *bi_mddev; |
| |
| if (!mddev->gendisk) |
| return; |
| |
| bi_rdev = bdev_get_integrity(rdev->bdev); |
| bi_mddev = blk_get_integrity(mddev->gendisk); |
| |
| if (!bi_mddev) /* nothing to do */ |
| return; |
| if (rdev->raid_disk < 0) /* skip spares */ |
| return; |
| if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
| rdev->bdev->bd_disk) >= 0) |
| return; |
| printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); |
| blk_integrity_unregister(mddev->gendisk); |
| } |
| EXPORT_SYMBOL(md_integrity_add_rdev); |
| |
| static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev) |
| { |
| char b[BDEVNAME_SIZE]; |
| struct kobject *ko; |
| char *s; |
| int err; |
| |
| if (rdev->mddev) { |
| MD_BUG(); |
| return -EINVAL; |
| } |
| |
| /* prevent duplicates */ |
| if (find_rdev(mddev, rdev->bdev->bd_dev)) |
| return -EEXIST; |
| |
| /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
| if (rdev->sectors && (mddev->dev_sectors == 0 || |
| rdev->sectors < mddev->dev_sectors)) { |
| if (mddev->pers) { |
| /* Cannot change size, so fail |
| * If mddev->level <= 0, then we don't care |
| * about aligning sizes (e.g. linear) |
| */ |
| if (mddev->level > 0) |
| return -ENOSPC; |
| } else |
| mddev->dev_sectors = rdev->sectors; |
| } |
| |
| /* Verify rdev->desc_nr is unique. |
| * If it is -1, assign a free number, else |
| * check number is not in use |
| */ |
| if (rdev->desc_nr < 0) { |
| int choice = 0; |
| if (mddev->pers) choice = mddev->raid_disks; |
| while (find_rdev_nr(mddev, choice)) |
| choice++; |
| rdev->desc_nr = choice; |
| } else { |
| if (find_rdev_nr(mddev, rdev->desc_nr)) |
| return -EBUSY; |
| } |
| if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
| printk(KERN_WARNING "md: %s: array is limited to %d devices\n", |
| mdname(mddev), mddev->max_disks); |
| return -EBUSY; |
| } |
| bdevname(rdev->bdev,b); |
| while ( (s=strchr(b, '/')) != NULL) |
| *s = '!'; |
| |
| rdev->mddev = mddev; |
| printk(KERN_INFO "md: bind<%s>\n", b); |
| |
| if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
| goto fail; |
| |
| ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
| if (sysfs_create_link(&rdev->kobj, ko, "block")) |
| /* failure here is OK */; |
| rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); |
| |
| list_add_rcu(&rdev->same_set, &mddev->disks); |
| bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
| |
| /* May as well allow recovery to be retried once */ |
| mddev->recovery_disabled++; |
| |
| return 0; |
| |
| fail: |
| printk(KERN_WARNING "md: failed to register dev-%s for %s\n", |
| b, mdname(mddev)); |
| return err; |
| } |
| |
| static void md_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); |
| } |
| |
| static void unbind_rdev_from_array(struct md_rdev * rdev) |
| { |
| char b[BDEVNAME_SIZE]; |
| if (!rdev->mddev) { |
| MD_BUG(); |
| return; |
| } |
| bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
| list_del_rcu(&rdev->same_set); |
| printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
| rdev->mddev = NULL; |
| sysfs_remove_link(&rdev->kobj, "block"); |
| sysfs_put(rdev->sysfs_state); |
| rdev->sysfs_state = 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, md_delayed_delete); |
| kobject_get(&rdev->kobj); |
| queue_work(md_misc_wq, &rdev->del_work); |
| } |
| |
| /* |
| * prevent the device from being mounted, repartitioned or |
| * otherwise reused by a RAID array (or any other kernel |
| * subsystem), by bd_claiming the device. |
| */ |
| static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
| { |
| int err = 0; |
| struct block_device *bdev; |
| char b[BDEVNAME_SIZE]; |
| |
| bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
| shared ? (struct md_rdev *)lock_rdev : rdev); |
| if (IS_ERR(bdev)) { |
| printk(KERN_ERR "md: could not open %s.\n", |
| __bdevname(dev, b)); |
| return PTR_ERR(bdev); |
| } |
| rdev->bdev = bdev; |
| return err; |
| } |
| |
| static void unlock_rdev(struct md_rdev *rdev) |
| { |
| struct block_device *bdev = rdev->bdev; |
| rdev->bdev = NULL; |
| if (!bdev) |
| MD_BUG(); |
| blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
| } |
| |
| void md_autodetect_dev(dev_t dev); |
| |
| static void export_rdev(struct md_rdev * rdev) |
| { |
| char b[BDEVNAME_SIZE]; |
| printk(KERN_INFO "md: export_rdev(%s)\n", |
| bdevname(rdev->bdev,b)); |
| if (rdev->mddev) |
| MD_BUG(); |
| md_rdev_clear(rdev); |
| #ifndef MODULE |
| if (test_bit(AutoDetected, &rdev->flags)) |
| md_autodetect_dev(rdev->bdev->bd_dev); |
| #endif |
| unlock_rdev(rdev); |
| kobject_put(&rdev->kobj); |
| } |
| |
| static void kick_rdev_from_array(struct md_rdev * rdev) |
| { |
| unbind_rdev_from_array(rdev); |
| export_rdev(rdev); |
| } |
| |
| static void export_array(struct mddev *mddev) |
| { |
| struct md_rdev *rdev, *tmp; |
| |
| rdev_for_each_safe(rdev, tmp, mddev) { |
| if (!rdev->mddev) { |
| MD_BUG(); |
| continue; |
| } |
| kick_rdev_from_array(rdev); |
| } |
| if (!list_empty(&mddev->disks)) |
| MD_BUG(); |
| mddev->raid_disks = 0; |
| mddev->major_version = 0; |
| } |
| |
| static void print_desc(mdp_disk_t *desc) |
| { |
| printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, |
| desc->major,desc->minor,desc->raid_disk,desc->state); |
| } |
| |
| static void print_sb_90(mdp_super_t *sb) |
| { |
| int i; |
| |
| printk(KERN_INFO |
| "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", |
| sb->major_version, sb->minor_version, sb->patch_version, |
| sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, |
| sb->ctime); |
| printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", |
| sb->level, sb->size, sb->nr_disks, sb->raid_disks, |
| sb->md_minor, sb->layout, sb->chunk_size); |
| printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" |
| " FD:%d SD:%d CSUM:%08x E:%08lx\n", |
| sb->utime, sb->state, sb->active_disks, sb->working_disks, |
| sb->failed_disks, sb->spare_disks, |
| sb->sb_csum, (unsigned long)sb->events_lo); |
| |
| printk(KERN_INFO); |
| for (i = 0; i < MD_SB_DISKS; i++) { |
| mdp_disk_t *desc; |
| |
| desc = sb->disks + i; |
| if (desc->number || desc->major || desc->minor || |
| desc->raid_disk || (desc->state && (desc->state != 4))) { |
| printk(" D %2d: ", i); |
| print_desc(desc); |
| } |
| } |
| printk(KERN_INFO "md: THIS: "); |
| print_desc(&sb->this_disk); |
| } |
| |
| static void print_sb_1(struct mdp_superblock_1 *sb) |
| { |
| __u8 *uuid; |
| |
| uuid = sb->set_uuid; |
| printk(KERN_INFO |
| "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
| "md: Name: \"%s\" CT:%llu\n", |
| le32_to_cpu(sb->major_version), |
| le32_to_cpu(sb->feature_map), |
| uuid, |
| sb->set_name, |
| (unsigned long long)le64_to_cpu(sb->ctime) |
| & MD_SUPERBLOCK_1_TIME_SEC_MASK); |
| |
| uuid = sb->device_uuid; |
| printk(KERN_INFO |
| "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" |
| " RO:%llu\n" |
| "md: Dev:%08x UUID: %pU\n" |
| "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
| "md: (MaxDev:%u) \n", |
| le32_to_cpu(sb->level), |
| (unsigned long long)le64_to_cpu(sb->size), |
| le32_to_cpu(sb->raid_disks), |
| le32_to_cpu(sb->layout), |
| le32_to_cpu(sb->chunksize), |
| (unsigned long long)le64_to_cpu(sb->data_offset), |
| (unsigned long long)le64_to_cpu(sb->data_size), |
| (unsigned long long)le64_to_cpu(sb->super_offset), |
| (unsigned long long)le64_to_cpu(sb->recovery_offset), |
| le32_to_cpu(sb->dev_number), |
| uuid, |
| sb->devflags, |
| (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, |
| (unsigned long long)le64_to_cpu(sb->events), |
| (unsigned long long)le64_to_cpu(sb->resync_offset), |
| le32_to_cpu(sb->sb_csum), |
| le32_to_cpu(sb->max_dev) |
| ); |
| } |
| |
| static void print_rdev(struct md_rdev *rdev, int major_version) |
| { |
| char b[BDEVNAME_SIZE]; |
| printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
| bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, |
| test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
| rdev->desc_nr); |
| if (rdev->sb_loaded) { |
| printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
| switch (major_version) { |
| case 0: |
| print_sb_90(page_address(rdev->sb_page)); |
| break; |
| case 1: |
| print_sb_1(page_address(rdev->sb_page)); |
| break; |
| } |
| } else |
| printk(KERN_INFO "md: no rdev superblock!\n"); |
| } |
| |
| static void md_print_devices(void) |
| { |
| struct list_head *tmp; |
| struct md_rdev *rdev; |
| struct mddev *mddev; |
| char b[BDEVNAME_SIZE]; |
| |
| printk("\n"); |
| printk("md: **********************************\n"); |
| printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); |
| printk("md: **********************************\n"); |
| for_each_mddev(mddev, tmp) { |
| |
| if (mddev->bitmap) |
| bitmap_print_sb(mddev->bitmap); |
| else |
| printk("%s: ", mdname(mddev)); |
| rdev_for_each(rdev, mddev) |
| printk("<%s>", bdevname(rdev->bdev,b)); |
| printk("\n"); |
| |
| rdev_for_each(rdev, mddev) |
| print_rdev(rdev, mddev->major_version); |
| } |
| printk("md: **********************************\n"); |
| printk("\n"); |
| } |
| |
| |
| static void sync_sbs(struct mddev * mddev, int nospares) |
| { |
| /* Update each superblock (in-memory image), but |
| * if we are allowed to, skip spares which already |
| * have the right event counter, or have one earlier |
| * (which would mean they aren't being marked as dirty |
| * with the rest of the array) |
| */ |
| struct md_rdev *rdev; |
| rdev_for_each(rdev, mddev) { |
| if (rdev->sb_events == mddev->events || |
| (nospares && |
| rdev->raid_disk < 0 && |
| rdev->sb_events+1 == mddev->events)) { |
| /* Don't update this superblock */ |
| rdev->sb_loaded = 2; |
| } else { |
| sync_super(mddev, rdev); |
| rdev->sb_loaded = 1; |
| } |
| } |
| } |
| |
| static void md_update_sb(struct mddev * mddev, int force_change) |
| { |
| struct md_rdev *rdev; |
| int sync_req; |
| int nospares = 0; |
| int any_badblocks_changed = 0; |
| |
| if (mddev->ro) { |
| if (force_change) |
| set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| return; |
| } |
| repeat: |
| /* First make sure individual recovery_offsets are correct */ |
| rdev_for_each(rdev, mddev) { |
| if (rdev->raid_disk >= 0 && |
| mddev->delta_disks >= 0 && |
| !test_bit(In_sync, &rdev->flags) && |
| mddev->curr_resync_completed > rdev->recovery_offset) |
| rdev->recovery_offset = mddev->curr_resync_completed; |
| |
| } |
| if (!mddev->persistent) { |
| clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
| if (!mddev->external) { |
| clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
| rdev_for_each(rdev, mddev) { |
| if (rdev->badblocks.changed) { |
| rdev->badblocks.changed = 0; |
| md_ack_all_badblocks(&rdev->badblocks); |
| md_error(mddev, rdev); |
| } |
| clear_bit(Blocked, &rdev->flags); |
| clear_bit(BlockedBadBlocks, &rdev->flags); |
| wake_up(&rdev->blocked_wait); |
| } |
| } |
| wake_up(&mddev->sb_wait); |
| return; |
| } |
| |
| spin_lock_irq(&mddev->write_lock); |
| |
| mddev->utime = get_seconds(); |
| |
| if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
| force_change = 1; |
| if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
| /* just a clean<-> dirty transition, possibly leave spares alone, |
| * though if events isn't the right even/odd, we will have to do |
| * spares after all |
| */ |
| nospares = 1; |
| if (force_change) |
| nospares = 0; |
| if (mddev->degraded) |
| /* If the array is degraded, then skipping spares is both |
| * dangerous and fairly pointless. |
| * Dangerous because a device that was removed from the array |
| * might have a event_count that still looks up-to-date, |
| * so it can be re-added without a resync. |
| * Pointless because if there are any spares to skip, |
| * then a recovery will happen and soon that array won't |
| * be degraded any more and the spare can go back to sleep then. |
| */ |
| nospares = 0; |
| |
| sync_req = mddev->in_sync; |
| |
| /* 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->can_decrease_events |
| && mddev->events != 1) { |
| mddev->events--; |
| mddev->can_decrease_events = 0; |
| } else { |
| /* otherwise we have to go forward and ... */ |
| mddev->events ++; |
| mddev->can_decrease_events = nospares; |
| } |
| |
| if (!mddev->events) { |
| /* |
| * oops, this 64-bit counter should never wrap. |
| * Either we are in around ~1 trillion A.C., assuming |
| * 1 reboot per second, or we have a bug: |
| */ |
| MD_BUG(); |
| mddev->events --; |
| } |
| |
| rdev_for_each(rdev, mddev) { |
| if (rdev->badblocks.changed) |
| any_badblocks_changed++; |
| if (test_bit(Faulty, &rdev->flags)) |
| set_bit(FaultRecorded, &rdev->flags); |
| } |
| |
| sync_sbs(mddev, nospares); |
| spin_unlock_irq(&mddev->write_lock); |
| |
| pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
| mdname(mddev), mddev->in_sync); |
| |
| bitmap_update_sb(mddev->bitmap); |
| rdev_for_each(rdev, mddev) { |
| char b[BDEVNAME_SIZE]; |
| |
| 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); |
| pr_debug("md: (write) %s's sb offset: %llu\n", |
| bdevname(rdev->bdev, b), |
| (unsigned long long)rdev->sb_start); |
| rdev->sb_events = mddev->events; |
| if (rdev->badblocks.size) { |
| md_super_write(mddev, rdev, |
| rdev->badblocks.sector, |
| rdev->badblocks.size << 9, |
| rdev->bb_page); |
| rdev->badblocks.size = 0; |
| } |
| |
| } else |
| pr_debug("md: %s (skipping faulty)\n", |
| bdevname(rdev->bdev, b)); |
| |
| if (mddev->level == LEVEL_MULTIPATH) |
| /* only need to write one superblock... */ |
| break; |
| } |
| md_super_wait(mddev); |
| /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
| |
| spin_lock_irq(&mddev->write_lock); |
| if (mddev->in_sync != sync_req || |
| test_bit(MD_CHANGE_DEVS, &mddev->flags)) { |
| /* have to write it out again */ |
| spin_unlock_irq(&mddev->write_lock); |
| goto repeat; |
| } |
| clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
| spin_unlock_irq(&mddev->write_lock); |
| wake_up(&mddev->sb_wait); |
| if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| |
| rdev_for_each(rdev, mddev) { |
| if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
| clear_bit(Blocked, &rdev->flags); |
| |
| if (any_badblocks_changed) |
| md_ack_all_badblocks(&rdev->badblocks); |
| clear_bit(BlockedBadBlocks, &rdev->flags); |
| wake_up(&rdev->blocked_wait); |
| } |
| } |
| |
| /* words written to sysfs files may, or may not, be \n terminated. |
| * We want to accept with case. For this we use cmd_match. |
| */ |
| static int cmd_match(const char *cmd, const char *str) |
| { |
| /* See if cmd, written into a sysfs file, matches |
| * str. They must either be the same, or cmd can |
| * have a trailing newline |
| */ |
| while (*cmd && *str && *cmd == *str) { |
| cmd++; |
| str++; |
| } |
| if (*cmd == '\n') |
| cmd++; |
| if (*str || *cmd) |
| return 0; |
| return 1; |
| } |
| |
| struct rdev_sysfs_entry { |
| struct attribute attr; |
| ssize_t (*show)(struct md_rdev *, char *); |
| ssize_t (*store)(struct md_rdev *, const char *, size_t); |
| }; |
| |
| static ssize_t |
| state_show(struct md_rdev *rdev, char *page) |
| { |
| char *sep = ""; |
| size_t len = 0; |
| |
| if (test_bit(Faulty, &rdev->flags) || |
| rdev->badblocks.unacked_exist) { |
| len+= sprintf(page+len, "%sfaulty",sep); |
| sep = ","; |
| } |
| if (test_bit(In_sync, &rdev->flags)) { |
| len += sprintf(page+len, "%sin_sync",sep); |
| sep = ","; |
| } |
| if (test_bit(WriteMostly, &rdev->flags)) { |
| len += sprintf(page+len, "%swrite_mostly",sep); |
| sep = ","; |
| } |
| if (test_bit(Blocked, &rdev->flags) || |
| (rdev->badblocks.unacked_exist |
| && !test_bit(Faulty, &rdev->flags))) { |
| len += sprintf(page+len, "%sblocked", sep); |
| sep = ","; |
| } |
| if (!test_bit(Faulty, &rdev->flags) && |
| !test_bit(In_sync, &rdev->flags)) { |
| len += sprintf(page+len, "%sspare", sep); |
| sep = ","; |
| } |
| if (test_bit(WriteErrorSeen, &rdev->flags)) { |
| len += sprintf(page+len, "%swrite_error", sep); |
| sep = ","; |
| } |
| if (test_bit(WantReplacement, &rdev->flags)) { |
| len += sprintf(page+len, "%swant_replacement", sep); |
| sep = ","; |
| } |
| if (test_bit(Replacement, &rdev->flags)) { |
| len += sprintf(page+len, "%sreplacement", sep); |
| sep = ","; |
| } |
| |
| return len+sprintf(page+len, "\n"); |
| } |
| |
| static ssize_t |
| state_store(struct md_rdev *rdev, const char *buf, size_t len) |
| { |
| /* can write |
| * faulty - simulates an error |
| * remove - disconnects the device |
| * writemostly - sets write_mostly |
| * -writemostly - clears write_mostly |
| * blocked - sets the Blocked flags |
| * -blocked - clears the Blocked and possibly simulates an error |
| * insync - sets Insync providing device isn't active |
| * -insync - clear Insync for a device with a slot assigned, |
| * so that it gets rebuilt based on bitmap |
| * write_error - sets WriteErrorSeen |
| * -write_error - clears WriteErrorSeen |
| */ |
| int err = -EINVAL; |
| if (cmd_match(buf, "faulty") && rdev->mddev->pers) { |
| md_error(rdev->mddev, rdev); |
| if (test_bit(Faulty, &rdev->flags)) |
| err = 0; |
| else |
| err = -EBUSY; |
| } else if (cmd_match(buf, "remove")) { |
| if (rdev->raid_disk >= 0) |
| err = -EBUSY; |
| else { |
| struct mddev *mddev = rdev->mddev; |
| kick_rdev_from_array(rdev); |
| if (mddev->pers) |
| md_update_sb(mddev, 1); |
| md_new_event(mddev); |
| err = 0; |
| } |
| } else if (cmd_match(buf, "writemostly")) { |
| set_bit(WriteMostly, &rdev->flags); |
| err = 0; |
| } else if (cmd_match(buf, "-writemostly")) { |
| clear_bit(WriteMostly, &rdev->flags); |
| err = 0; |
| } else if (cmd_match(buf, "blocked")) { |
| set_bit(Blocked, &rdev->flags); |
| err = 0; |
| } else if (cmd_match(buf, "-blocked")) { |
| if (!test_bit(Faulty, &rdev->flags) && |
| rdev->badblocks.unacked_exist) { |
| /* metadata handler doesn't understand badblocks, |
| * so we need to fail the device |
| */ |
| md_error(rdev->mddev, rdev); |
| } |
| clear_bit(Blocked, &rdev->flags); |
| clear_bit(BlockedBadBlocks, &rdev->flags); |
| wake_up(&rdev->blocked_wait); |
| set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
| md_wakeup_thread(rdev->mddev->thread); |
| |
| err = 0; |
| } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { |
| set_bit(In_sync, &rdev->flags); |
| err = 0; |
| } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
| clear_bit(In_sync, &rdev->flags); |
| rdev->saved_raid_disk = rdev->raid_disk; |
| rdev->raid_disk = -1; |
| err = 0; |
| } else if (cmd_match(buf, "write_error")) { |
| set_bit(WriteErrorSeen, &rdev->flags); |
| err = 0; |
| } else if (cmd_match(buf, "-write_error")) { |
| clear_bit(WriteErrorSeen, &rdev->flags); |
| err = 0; |
| } else if (cmd_match(buf, "want_replacement")) { |
| /* Any non-spare device that is not a replacement can |
| * become want_replacement at any time, but we then need to |
| * check if recovery is needed. |
| */ |
| if (rdev->raid_disk >= 0 && |
| !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. |
| * Once replacements starts it is too late though. |
| */ |
| err = 0; |
| clear_bit(WantReplacement, &rdev->flags); |
| } else if (cmd_match(buf, "replacement")) { |
| /* Can only set a device as a replacement when array has not |
| * yet been started. Once running, replacement is automatic |
| * from spares, or by assigning 'slot'. |
| */ |
| if (rdev->mddev->pers) |
| err = -EBUSY; |
| else { |
| set_bit(Replacement, &rdev->flags); |
| err = 0; |
| } |
| } else if (cmd_match(buf, "-replacement")) { |
| /* Similarly, can only clear Replacement before start */ |
| if (rdev->mddev->pers) |
| err = -EBUSY; |
| else { |
| clear_bit(Replacement, &rdev->flags); |
| err = 0; |
| } |
| } |
| if (!err) |
| sysfs_notify_dirent_safe(rdev->sysfs_state); |
| return err ? err : len; |
| } |
| static struct rdev_sysfs_entry rdev_state = |
| __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); |
| |
| static ssize_t |
| errors_show(struct md_rdev *rdev, char *page) |
| { |
| return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); |
| } |
| |
| static ssize_t |
| errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
| { |
| char *e; |
| unsigned long n = simple_strtoul(buf, &e, 10); |
| if (*buf && (*e == 0 || *e == '\n')) { |
| atomic_set(&rdev->corrected_errors, n); |
| return len; |
| } |
| return -EINVAL; |
| } |
| static struct rdev_sysfs_entry rdev_errors = |
| __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
| |
| static ssize_t |
| slot_show(struct md_rdev *rdev, char *page) |
| { |
| if (rdev->raid_disk < 0) |
| return sprintf(page, "none\n"); |
| else |
| return sprintf(page, "%d\n", rdev->raid_disk); |
| } |
| |
| static ssize_t |
| slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
| { |
| char *e; |
| int err; |
| int slot = simple_strtoul(buf, &e, 10); |
| if (strncmp(buf, "none", 4)==0) |
| slot = -1; |
| else if (e==buf || (*e && *e!= '\n')) |
| return -EINVAL; |
| if (rdev->mddev->pers && slot == -1) { |
| /* Setting 'slot' on an active array requires also |
| * updating the 'rd%d' link, and communicating |
| * with the personality with ->hot_*_disk. |
| * For now we only support removing |
| * failed/spare devices. This normally happens automatically, |
| * but not when the metadata is externally managed. |
| */ |
| if (rdev->raid_disk == -1) |
| return -EEXIST; |
| /* personality does all needed checks */ |
| if (rdev->mddev->pers->hot_remove_disk == NULL) |
| return -EINVAL; |
| clear_bit(Blocked, &rdev->flags); |
| remove_and_add_spares(rdev->mddev, rdev); |
| if (rdev->raid_disk >= 0) |
| return -EBUSY; |
| set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
| md_wakeup_thread(rdev->mddev->thread); |
| } else if (rdev->mddev->pers) { |
| /* Activating a spare .. or possibly reactivating |
| * if we ever get bitmaps working here. |
| */ |
| |
| if (rdev->raid_disk != -1) |
| return -EBUSY; |
| |
| if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
| return -EBUSY; |
| |
| if (rdev->mddev->pers->hot_add_disk == NULL) |
| return -EINVAL; |
| |
| if (slot >= rdev->mddev->raid_disks && |
| slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) |
| return -ENOSPC; |
| |
| rdev->raid_disk = slot; |
| if (test_bit(In_sync, &rdev->flags)) |
| rdev->saved_raid_disk = slot; |
| else |
| rdev->saved_raid_disk = -1; |
| clear_bit(In_sync, &rdev->flags); |
| clear_bit(Bitmap_sync, &rdev->flags); |
| err = rdev->mddev->pers-> |
| hot_add_disk(rdev->mddev, rdev); |
| if (err) { |
| rdev->raid_disk = -1; |
| return err; |
| } else |
| sysfs_notify_dirent_safe(rdev->sysfs_state); |
| if (sysfs_link_rdev(rdev->mddev, rdev)) |
| /* failure here is OK */; |
| /* don't wakeup anyone, leave that to userspace. */ |
| } else { |
| if (slot >= rdev->mddev->raid_disks && |
| slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) |
| return -ENOSPC; |
| rdev->raid_disk = slot; |
| /* assume it is working */ |
| clear_bit(Faulty, &rdev->flags); |
| clear_bit(WriteMostly, &rdev->flags); |
| set_bit(In_sync, &rdev->flags); |
| sysfs_notify_dirent_safe(rdev->sysfs_state); |
| } |
| return len; |
| } |
| |
| |
| static struct rdev_sysfs_entry rdev_slot = |
| __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
| |
| static ssize_t |
| offset_show(struct md_rdev *rdev, char *page) |
| { |
| return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
| } |
| |
| static ssize_t |
| offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
| { |
| unsigned long long offset; |
| if (kstrtoull(buf, 10, &offset) < 0) |
| return -EINVAL; |
| if (rdev->mddev->pers && rdev->raid_disk >= 0) |
| return -EBUSY; |
| if (rdev->sectors && rdev->mddev->external) |
| /* Must set offset before size, so overlap checks |
| * can be sane */ |
| return -EBUSY; |
| rdev->data_offset = offset; |
| rdev->new_data_offset = offset; |
| return len; |
| } |
| |
| static struct rdev_sysfs_entry rdev_offset = |
| __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
| |
| static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
| { |
| return sprintf(page, "%llu\n", |
| (unsigned long long)rdev->new_data_offset); |
| } |
| |
| static ssize_t new_offset_store(struct md_rdev *rdev, |
| const char *buf, size_t len) |
| { |
| unsigned long long new_offset; |
| struct mddev *mddev = rdev->mddev; |
| |
| if (kstrtoull(buf, 10, &new_offset) < 0) |
| return -EINVAL; |
| |
| if (mddev->sync_thread) |
| return -EBUSY; |
| if (new_offset == rdev->data_offset) |
| /* reset is always permitted */ |
| ; |
| else if (new_offset > rdev->data_offset) { |
| /* must not push array size beyond rdev_sectors */ |
| if (new_offset - rdev->data_offset |
| + mddev->dev_sectors > rdev->sectors) |
| return -E2BIG; |
| } |
| /* Metadata worries about other space details. */ |
| |
| /* decreasing the offset is inconsistent with a backwards |
| * reshape. |
| */ |
| if (new_offset < rdev->data_offset && |
| mddev->reshape_backwards) |
| return -EINVAL; |
| /* Increasing offset is inconsistent with forwards |
| * reshape. reshape_direction should be set to |
| * 'backwards' first. |
| */ |
| if (new_offset > rdev->data_offset && |
| !mddev->reshape_backwards) |
| return -EINVAL; |
| |
| if (mddev->pers && mddev->persistent && |
| !super_types[mddev->major_version] |
| .allow_new_offset(rdev, new_offset)) |
| return -E2BIG; |
| rdev->new_data_offset = new_offset; |
| if (new_offset > rdev->data_offset) |
| mddev->reshape_backwards = 1; |
| else if (new_offset < rdev->data_offset) |
| mddev->reshape_backwards = 0; |
| |
| return len; |
| } |
| static struct rdev_sysfs_entry rdev_new_offset = |
| __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); |
| |
| static ssize_t |
| rdev_size_show(struct md_rdev *rdev, char *page) |
| { |
| return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
| } |
| |
| static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
| { |
| /* check if two start/length pairs overlap */ |
| if (s1+l1 <= s2) |
| return 0; |
| if (s2+l2 <= s1) |
| return 0; |
| return 1; |
| } |
| |
| static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
| { |
| unsigned long long blocks; |
| sector_t new; |
| |
| if (kstrtoull(buf, 10, &blocks) < 0) |
| return -EINVAL; |
| |
| if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) |
| return -EINVAL; /* sector conversion overflow */ |
| |
| new = blocks * 2; |
| if (new != blocks * 2) |
| return -EINVAL; /* unsigned long long to sector_t overflow */ |
| |
| *sectors = new; |
| return 0; |
| } |
| |
| static ssize_t |
| rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
| { |
| struct mddev *my_mddev = rdev->mddev; |
| sector_t oldsectors = rdev->sectors; |
| sector_t sectors; |
| |
| if (strict_blocks_to_sectors(buf, §ors) < 0) |
| return -EINVAL; |
| if (rdev->data_offset != rdev->new_data_offset) |
| return -EINVAL; /* too confusing */ |
| if (my_mddev->pers && rdev->raid_disk >= 0) { |
| if (my_mddev->persistent) { |
| sectors = super_types[my_mddev->major_version]. |
| rdev_size_change(rdev, sectors); |
| if (!sectors) |
| return -EBUSY; |
| } else if (!sectors) |
| sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
| rdev->data_offset; |
| if (!my_mddev->pers->resize) |
| /* Cannot change size for RAID0 or Linear etc */ |
| return -EINVAL; |
| } |
| if (sectors < my_mddev->dev_sectors) |
| return -EINVAL; /* component must fit device */ |
| |
| rdev->sectors = sectors; |
| if (sectors > oldsectors && my_mddev->external) { |
| /* need to check that all other rdevs with the same ->bdev |
| * do not overlap. We need to unlock the mddev to avoid |
| * a deadlock. We have already changed rdev->sectors, and if |
| * we have to change it back, we will have the lock again. |
| */ |
| struct mddev *mddev; |
| int overlap = 0; |
| struct list_head *tmp; |
| |
| mddev_unlock(my_mddev); |
| for_each_mddev(mddev, tmp) { |
| struct md_rdev *rdev2; |
| |
| mddev_lock_nointr(mddev); |
| rdev_for_each(rdev2, mddev) |
| if (rdev->bdev == rdev2->bdev && |
| rdev != rdev2 && |
| overlaps(rdev->data_offset, rdev->sectors, |
| rdev2->data_offset, |
| rdev2->sectors)) { |
| overlap = 1; |
| break; |
| } |
| mddev_unlock(mddev); |
| if (overlap) { |
| mddev_put(mddev); |
| break; |
| } |
| } |
| mddev_lock_nointr(my_mddev); |
| if (overlap) { |
| /* Someone else could have slipped in a size |
| * change here, but doing so is just silly. |
| * We put oldsectors back because we *know* it is |
| * safe, and trust userspace not to race with |
| * itself |
| */ |
| rdev->sectors = oldsectors; |
| return -EBUSY; |
| } |
| } |
| return len; |
| } |
| |
| static struct rdev_sysfs_entry rdev_size = |
| __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
| |
| |
| static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
| { |
| unsigned long long recovery_start = rdev->recovery_offset; |
| |
| if (test_bit(In_sync, &rdev->flags) || |
| recovery_start == MaxSector) |
| return sprintf(page, "none\n"); |
| |
| return sprintf(page, "%llu\n", recovery_start); |
| } |
| |
| static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
| { |
| unsigned long long recovery_start; |
| |
| if (cmd_match(buf, "none")) |
| recovery_start = MaxSector; |
| else if (kstrtoull(buf, 10, &recovery_start)) |
| return -EINVAL; |
| |
| if (rdev->mddev->pers && |
| rdev->raid_disk >= 0) |
| return -EBUSY; |
| |
| rdev->recovery_offset = recovery_start; |
| if (recovery_start == MaxSector) |
| set_bit(In_sync, &rdev->flags); |
| else |
| clear_bit(In_sync, &rdev->flags); |
| return len; |
| } |
| |
| static struct rdev_sysfs_entry rdev_recovery_start = |
| __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); |
| |
| |
| static ssize_t |
| badblocks_show(struct badblocks *bb, char *page, int unack); |
| static ssize_t |
| badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); |
| |
| static ssize_t bb_show(struct md_rdev *rdev, char *page) |
| { |
| return badblocks_show(&rdev->badblocks, page, 0); |
| } |
| static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
| { |
| int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
| /* Maybe that ack was all we needed */ |
| if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) |
| wake_up(&rdev->blocked_wait); |
| return rv; |
| } |
| static struct rdev_sysfs_entry rdev_bad_blocks = |
| __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); |
| |
| |
| static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
| { |
| return badblocks_show(&rdev->badblocks, page, 1); |
| } |
| static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
| { |
| return badblocks_store(&rdev->badblocks, page, len, 1); |
| } |
| static struct rdev_sysfs_entry rdev_unack_bad_blocks = |
| __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); |
| |
| static struct attribute *rdev_default_attrs[] = { |
| &rdev_state.attr, |
| &rdev_errors.attr, |
| &rdev_slot.attr, |
| &rdev_offset.attr, |
| &rdev_new_offset.attr, |
| &rdev_size.attr, |
| &rdev_recovery_start.attr, |
| &rdev_bad_blocks.attr, |
| &rdev_unack_bad_blocks.attr, |
| NULL, |
| }; |
| static ssize_t |
| rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) |
| { |
| struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); |
| struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
| struct mddev *mddev = rdev->mddev; |
| ssize_t rv; |
| |
| if (!entry->show) |
| return -EIO; |
| |
| rv = mddev ? mddev_lock(mddev) : -EBUSY; |
| if (!rv) { |
| if (rdev->mddev == NULL) |
| rv = -EBUSY; |
| else |
| rv = entry->show(rdev, page); |
| mddev_unlock(mddev); |
| } |
| return rv; |
| } |
| |
| static ssize_t |
| rdev_attr_store(struct kobject *kobj, struct attribute *attr, |
| const char *page, size_t length) |
| { |
| struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); |
| struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
| ssize_t rv; |
| struct mddev *mddev = rdev->mddev; |
| |
| if (!entry->store) |
| return -EIO; |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| rv = mddev ? mddev_lock(mddev): -EBUSY; |
| if (!rv) { |
| if (rdev->mddev == NULL) |
| rv = -EBUSY; |
| else |
| rv = entry->store(rdev, page, length); |
| mddev_unlock(mddev); |
| } |
| return rv; |
| } |
| |
| static void rdev_free(struct kobject *ko) |
| { |
| struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
| kfree(rdev); |
| } |
| static const struct sysfs_ops rdev_sysfs_ops = { |
| .show = rdev_attr_show, |
| .store = rdev_attr_store, |
| }; |
| static struct kobj_type rdev_ktype = { |
| .release = rdev_free, |
| .sysfs_ops = &rdev_sysfs_ops, |
| .default_attrs = rdev_default_attrs, |
| }; |
| |
| int md_rdev_init(struct md_rdev *rdev) |
| { |
| rdev->desc_nr = -1; |
| rdev->saved_raid_disk = -1; |
| rdev->raid_disk = -1; |
| rdev->flags = 0; |
| rdev->data_offset = 0; |
| rdev->new_data_offset = 0; |
| rdev->sb_events = 0; |
| rdev->last_read_error.tv_sec = 0; |
| rdev->last_read_error.tv_nsec = 0; |
| rdev->sb_loaded = 0; |
| rdev->bb_page = NULL; |
| atomic_set(&rdev->nr_pending, 0); |
| atomic_set(&rdev->read_errors, 0); |
| atomic_set(&rdev->corrected_errors, 0); |
| |
| INIT_LIST_HEAD(&rdev->same_set); |
| init_waitqueue_head(&rdev->blocked_wait); |
| |
| /* Add space to store bad block list. |
| * This reserves the space even on arrays where it cannot |
| * be used - I wonder if that matters |
| */ |
| rdev->badblocks.count = 0; |
| rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
| rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| seqlock_init(&rdev->badblocks.lock); |
| if (rdev->badblocks.page == NULL) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(md_rdev_init); |
| /* |
| * Import a device. If 'super_format' >= 0, then sanity check the superblock |
| * |
| * mark the device faulty if: |
| * |
| * - the device is nonexistent (zero size) |
| * - the device has no valid superblock |
| * |
| * a faulty rdev _never_ has rdev->sb set. |
| */ |
| static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
| { |
| char b[BDEVNAME_SIZE]; |
| int err; |
| struct md_rdev *rdev; |
| sector_t size; |
| |
| rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
| if (!rdev) { |
| printk(KERN_ERR "md: could not alloc mem for new device!\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| err = md_rdev_init(rdev); |
| if (err) |
| goto abort_free; |
| err = alloc_disk_sb(rdev); |
| if (err) |
| goto abort_free; |
| |
| err = lock_rdev(rdev, newdev, super_format == -2); |
| if (err) |
| goto abort_free; |
| |
| kobject_init(&rdev->kobj, &rdev_ktype); |
| |
| size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
| if (!size) { |
| printk(KERN_WARNING |
| "md: %s has zero or unknown size, marking faulty!\n", |
| bdevname(rdev->bdev,b)); |
| err = -EINVAL; |
| goto abort_free; |
| } |
| |
| if (super_format >= 0) { |
| err = super_types[super_format]. |
| load_super(rdev, NULL, super_minor); |
| if (err == -EINVAL) { |
| printk(KERN_WARNING |
| "md: %s does not have a valid v%d.%d " |
| "superblock, not importing!\n", |
| bdevname(rdev->bdev,b), |
| super_format, super_minor); |
| goto abort_free; |
| } |
| if (err < 0) { |
| printk(KERN_WARNING |
| "md: could not read %s's sb, not importing!\n", |
| bdevname(rdev->bdev,b)); |
| goto abort_free; |
| } |
| } |
| |
| return rdev; |
| |
| abort_free: |
| if (rdev->bdev) |
| unlock_rdev(rdev); |
| md_rdev_clear(rdev); |
| kfree(rdev); |
| return ERR_PTR(err); |
| } |
| |
| /* |
| * Check a full RAID array for plausibility |
| */ |
| |
| |
| static void analyze_sbs(struct mddev * mddev) |
| { |
| int i; |
| struct md_rdev *rdev, *freshest, *tmp; |
| char b[BDEVNAME_SIZE]; |
| |
| freshest = NULL; |
| rdev_for_each_safe(rdev, tmp, mddev) |
| switch (super_types[mddev->major_version]. |
| load_super(rdev, freshest, mddev->minor_version)) { |
| case 1: |
| freshest = rdev; |
| break; |
| case 0: |
| break; |
| default: |
| printk( KERN_ERR \ |
| "md: fatal superblock inconsistency in %s" |
| " -- removing from array\n", |
| bdevname(rdev->bdev,b)); |
| kick_rdev_from_array(rdev); |
| } |
| |
| |
| super_types[mddev->major_version]. |
| validate_super(mddev, freshest); |
| |
| i = 0; |
| rdev_for_each_safe(rdev, tmp, mddev) { |
| if (mddev->max_disks && |
| (rdev->desc_nr >= mddev->max_disks || |
| i > mddev->max_disks)) { |
| printk(KERN_WARNING |
| "md: %s: %s: only %d devices permitted\n", |
| mdname(mddev), bdevname(rdev->bdev, b), |
| mddev->max_disks); |
| kick_rdev_from_array(rdev); |
| continue; |
| } |
| if (rdev != freshest) |
| if (super_types[mddev->major_version]. |
| validate_super(mddev, rdev)) { |
| printk(KERN_WARNING "md: kicking non-fresh %s" |
| " from array!\n", |
| bdevname(rdev->bdev,b)); |
| kick_rdev_from_array(rdev); |
| continue; |
| } |
| if (mddev->level == LEVEL_MULTIPATH) { |
| rdev->desc_nr = i++; |
| rdev->raid_disk = rdev->desc_nr; |
| set_bit(In_sync, &rdev->flags); |
| } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
| rdev->raid_disk = -1; |
| clear_bit(In_sync, &rdev->flags); |
| } |
| } |
| } |
| |
| /* Read a fixed-point number. |
| * Numbers in sysfs attributes should be in "standard" units where |
| * possible, so time should be in seconds. |
| * However we internally use a a much smaller unit such as |
| * milliseconds or jiffies. |
| * This function takes a decimal number with a possible fractional |
| * component, and produces an integer which is the result of |
| * multiplying that number by 10^'scale'. |
| * all without any floating-point arithmetic. |
| */ |
| int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) |
| { |
| unsigned long result = 0; |
| long decimals = -1; |
| while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { |
| if (*cp == '.') |
| decimals = 0; |
| else if (decimals < scale) { |
| unsigned int value; |
| value = *cp - '0'; |
| result = result * 10 + value; |
| if (decimals >= 0) |
| decimals++; |
| } |
| cp++; |
| } |
| if (*cp == '\n') |
| cp++; |
| if (*cp) |
| return -EINVAL; |
| if (decimals < 0) |
| decimals = 0; |
| while (decimals < scale) { |
| result *= 10; |
| decimals ++; |
| } |
| *res = result; |
| return 0; |
| } |
| |
| |
| static void md_safemode_timeout(unsigned long data); |
| |
| 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); |
| } |
| static ssize_t |
| safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
| { |
| unsigned long msec; |
| |
| if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
| return -EINVAL; |
| if (msec == 0) |
| mddev->safemode_delay = 0; |
| else { |
| unsigned long old_delay = mddev->safemode_delay; |
| mddev->safemode_delay = (msec*HZ)/1000; |
| if (mddev->safemode_delay == 0) |
| mddev->safemode_delay = 1; |
| if (mddev->safemode_delay < old_delay || old_delay == 0) |
| md_safemode_timeout((unsigned long)mddev); |
| } |
| return len; |
| } |
| static struct md_sysfs_entry md_safe_delay = |
| __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
| |
| static ssize_t |
| level_show(struct mddev *mddev, char *page) |
| { |
| struct md_personality *p = mddev->pers; |
| if (p) |
| return sprintf(page, "%s\n", p->name); |
| else if (mddev->clevel[0]) |
| return sprintf(page, "%s\n", mddev->clevel); |
| else if (mddev->level != LEVEL_NONE) |
| return sprintf(page, "%d\n", mddev->level); |
| else |
| return 0; |
| } |
| |
| static ssize_t |
| level_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char clevel[16]; |
| ssize_t rv = len; |
| struct md_personality *pers; |
| long level; |
| void *priv; |
| struct md_rdev *rdev; |
| |
| if (mddev->pers == NULL) { |
| if (len == 0) |
| return 0; |
| if (len >= sizeof(mddev->clevel)) |
| return -ENOSPC; |
| strncpy(mddev->clevel, buf, len); |
| if (mddev->clevel[len-1] == '\n') |
| len--; |
| mddev->clevel[len] = 0; |
| mddev->level = LEVEL_NONE; |
| return rv; |
| } |
| |
| /* request to change the personality. Need to ensure: |
| * - array is not engaged in resync/recovery/reshape |
| * - old personality can be suspended |
| * - new personality will access other array. |
| */ |
| |
| if (mddev->sync_thread || |
| mddev->reshape_position != MaxSector || |
| mddev->sysfs_active) |
| return -EBUSY; |
| |
| if (!mddev->pers->quiesce) { |
| printk(KERN_WARNING "md: %s: %s does not support online personality change\n", |
| mdname(mddev), mddev->pers->name); |
| return -EINVAL; |
| } |
| |
| /* Now find the new personality */ |
| if (len == 0 || len >= sizeof(clevel)) |
| return -EINVAL; |
| strncpy(clevel, buf, len); |
| if (clevel[len-1] == '\n') |
| len--; |
| clevel[len] = 0; |
| if (kstrtol(clevel, 10, &level)) |
| level = LEVEL_NONE; |
| |
| if (request_module("md-%s", clevel) != 0) |
| request_module("md-level-%s", clevel); |
| spin_lock(&pers_lock); |
| pers = find_pers(level, clevel); |
| if (!pers || !try_module_get(pers->owner)) { |
| spin_unlock(&pers_lock); |
| printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
| return -EINVAL; |
| } |
| spin_unlock(&pers_lock); |
| |
| if (pers == mddev->pers) { |
| /* Nothing to do! */ |
| module_put(pers->owner); |
| return rv; |
| } |
| if (!pers->takeover) { |
| module_put(pers->owner); |
| printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", |
| mdname(mddev), clevel); |
| return -EINVAL; |
| } |
| |
| rdev_for_each(rdev, mddev) |
| rdev->new_raid_disk = rdev->raid_disk; |
| |
| /* ->takeover must set new_* and/or delta_disks |
| * if it succeeds, and may set them when it fails. |
| */ |
| priv = pers->takeover(mddev); |
| if (IS_ERR(priv)) { |
| mddev->new_level = mddev->level; |
| mddev->new_layout = mddev->layout; |
| mddev->new_chunk_sectors = mddev->chunk_sectors; |
| mddev->raid_disks -= mddev->delta_disks; |
| mddev->delta_disks = 0; |
| mddev->reshape_backwards = 0; |
| module_put(pers->owner); |
| printk(KERN_WARNING "md: %s: %s would not accept array\n", |
| mdname(mddev), clevel); |
| return PTR_ERR(priv); |
| } |
| |
| /* Looks like we have a winner */ |
| mddev_suspend(mddev); |
| mddev->pers->stop(mddev); |
| |
| if (mddev->pers->sync_request == NULL && |
| pers->sync_request != NULL) { |
| /* need to add the md_redundancy_group */ |
| if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) |
| printk(KERN_WARNING |
| "md: cannot register extra attributes for %s\n", |
| mdname(mddev)); |
| mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
| } |
| if (mddev->pers->sync_request != NULL && |
| pers->sync_request == NULL) { |
| /* need to remove the md_redundancy_group */ |
| if (mddev->to_remove == NULL) |
| mddev->to_remove = &md_redundancy_group; |
| } |
| |
| if (mddev->pers->sync_request == NULL && |
| mddev->external) { |
| /* We are converting from a no-redundancy array |
| * to a redundancy array and metadata is managed |
| * externally so we need to be sure that writes |
| * won't block due to a need to transition |
| * clean->dirty |
| * until external management is started. |
| */ |
| mddev->in_sync = 0; |
| mddev->safemode_delay = 0; |
| mddev->safemode = 0; |
| } |
| |
| rdev_for_each(rdev, mddev) { |
| if (rdev->raid_disk < 0) |
| continue; |
| if (rdev->new_raid_disk >= mddev->raid_disks) |
| rdev->new_raid_disk = -1; |
| if (rdev->new_raid_disk == rdev->raid_disk) |
| continue; |
| sysfs_unlink_rdev(mddev, rdev); |
| } |
| rdev_for_each(rdev, mddev) { |
| if (rdev->raid_disk < 0) |
| continue; |
| if (rdev->new_raid_disk == rdev->raid_disk) |
| continue; |
| rdev->raid_disk = rdev->new_raid_disk; |
| if (rdev->raid_disk < 0) |
| clear_bit(In_sync, &rdev->flags); |
| else { |
| if (sysfs_link_rdev(mddev, rdev)) |
| printk(KERN_WARNING "md: cannot register rd%d" |
| " for %s after level change\n", |
| rdev->raid_disk, mdname(mddev)); |
| } |
| } |
| |
| module_put(mddev->pers->owner); |
| mddev->pers = pers; |
| mddev->private = priv; |
| strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
| mddev->level = mddev->new_level; |
| mddev->layout = mddev->new_layout; |
| mddev->chunk_sectors = mddev->new_chunk_sectors; |
| mddev->delta_disks = 0; |
| mddev->reshape_backwards = 0; |
| mddev->degraded = 0; |
| if (mddev->pers->sync_request == NULL) { |
| /* this is now an array without redundancy, so |
| * it must always be in_sync |
| */ |
| mddev->in_sync = 1; |
| del_timer_sync(&mddev->safemode_timer); |
| } |
| blk_set_stacking_limits(&mddev->queue->limits); |
| pers->run(mddev); |
| set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| mddev_resume(mddev); |
| if (!mddev->thread) |
| md_update_sb(mddev, 1); |
| sysfs_notify(&mddev->kobj, NULL, "level"); |
| md_new_event(mddev); |
| return rv; |
| } |
| |
| static struct md_sysfs_entry md_level = |
| __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
| |
| |
| static ssize_t |
| layout_show(struct mddev *mddev, char *page) |
| { |
| /* just a number, not meaningful for all levels */ |
| if (mddev->reshape_position != MaxSector && |
| mddev->layout != mddev->new_layout) |
| return sprintf(page, "%d (%d)\n", |
| mddev->new_layout, mddev->layout); |
| return sprintf(page, "%d\n", mddev->layout); |
| } |
| |
| static ssize_t |
| layout_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char *e; |
| unsigned long n = simple_strtoul(buf, &e, 10); |
| |
| if (!*buf || (*e && *e != '\n')) |
| return -EINVAL; |
| |
| if (mddev->pers) { |
| int err; |
| if (mddev->pers->check_reshape == NULL) |
| return -EBUSY; |
| mddev->new_layout = n; |
| err = mddev->pers->check_reshape(mddev); |
| if (err) { |
| mddev->new_layout = mddev->layout; |
| return err; |
| } |
| } else { |
| mddev->new_layout = n; |
| if (mddev->reshape_position == MaxSector) |
| mddev->layout = n; |
| } |
| return len; |
| } |
| static struct md_sysfs_entry md_layout = |
| __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
| |
| |
| static ssize_t |
| raid_disks_show(struct mddev *mddev, char *page) |
| { |
| if (mddev->raid_disks == 0) |
| return 0; |
| if (mddev->reshape_position != MaxSector && |
| mddev->delta_disks != 0) |
| return sprintf(page, "%d (%d)\n", mddev->raid_disks, |
| mddev->raid_disks - mddev->delta_disks); |
| return sprintf(page, "%d\n", mddev->raid_disks); |
| } |
| |
| static int update_raid_disks(struct mddev *mddev, int raid_disks); |
| |
| static ssize_t |
| raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char *e; |
| int rv = 0; |
| unsigned long n = simple_strtoul(buf, &e, 10); |
| |
| if (!*buf || (*e && *e != '\n')) |
| return -EINVAL; |
| |
| if (mddev->pers) |
| rv = update_raid_disks(mddev, n); |
| else if (mddev->reshape_position != MaxSector) { |
| struct md_rdev *rdev; |
| int olddisks = mddev->raid_disks - mddev->delta_disks; |
| |
| rdev_for_each(rdev, mddev) { |
| if (olddisks < n && |
| rdev->data_offset < rdev->new_data_offset) |
| return -EINVAL; |
| if (olddisks > n && |
| rdev->data_offset > rdev->new_data_offset) |
| return -EINVAL; |
| } |
| mddev->delta_disks = n - olddisks; |
| mddev->raid_disks = n; |
| mddev->reshape_backwards = (mddev->delta_disks < 0); |
| } else |
| mddev->raid_disks = n; |
| return rv ? rv : len; |
| } |
| static struct md_sysfs_entry md_raid_disks = |
| __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
| |
| static ssize_t |
| chunk_size_show(struct mddev *mddev, char *page) |
| { |
| if (mddev->reshape_position != MaxSector && |
| mddev->chunk_sectors != mddev->new_chunk_sectors) |
| return sprintf(page, "%d (%d)\n", |
| mddev->new_chunk_sectors << 9, |
| mddev->chunk_sectors << 9); |
| return sprintf(page, "%d\n", mddev->chunk_sectors << 9); |
| } |
| |
| static ssize_t |
| chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char *e; |
| unsigned long n = simple_strtoul(buf, &e, 10); |
| |
| if (!*buf || (*e && *e != '\n')) |
| return -EINVAL; |
| |
| if (mddev->pers) { |
| int err; |
| if (mddev->pers->check_reshape == NULL) |
| return -EBUSY; |
| mddev->new_chunk_sectors = n >> 9; |
| err = mddev->pers->check_reshape(mddev); |
| if (err) { |
| mddev->new_chunk_sectors = mddev->chunk_sectors; |
| return err; |
| } |
| } else { |
| mddev->new_chunk_sectors = n >> 9; |
| if (mddev->reshape_position == MaxSector) |
| mddev->chunk_sectors = n >> 9; |
| } |
| return len; |
| } |
| static struct md_sysfs_entry md_chunk_size = |
| __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
| |
| static ssize_t |
| resync_start_show(struct mddev *mddev, char *page) |
| { |
| if (mddev->recovery_cp == MaxSector) |
| return sprintf(page, "none\n"); |
| return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
| } |
| |
| static ssize_t |
| resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char *e; |
| unsigned long long n = simple_strtoull(buf, &e, 10); |
| |
| if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
| return -EBUSY; |
| if (cmd_match(buf, "none")) |
| n = MaxSector; |
| else if (!*buf || (*e && *e != '\n')) |
| return -EINVAL; |
| |
| mddev->recovery_cp = n; |
| if (mddev->pers) |
| set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| return len; |
| } |
| static struct md_sysfs_entry md_resync_start = |
| __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
| |
| /* |
| * The array state can be: |
| * |
| * clear |
| * No devices, no size, no level |
| * Equivalent to STOP_ARRAY ioctl |
| * inactive |
| * May have some settings, but array is not active |
| * all IO results in error |
| * When written, doesn't tear down array, but just stops it |
| * suspended (not supported yet) |
| * All IO requests will block. The array can be reconfigured. |
| * Writing this, if accepted, will block until array is quiescent |
| * readonly |
| * no resync can happen. no superblocks get written. |
| * write requests fail |
| * read-auto |
| * like readonly, but behaves like 'clean' on a write request. |
| * |
| * clean - no pending writes, but otherwise active. |
| * When written to inactive array, starts without resync |
| * If a write request arrives then |
| * if metadata is known, mark 'dirty' and switch to 'active'. |
| * if not known, block and switch to write-pending |
| * If written to an active array that has pending writes, then fails. |
| * active |
| * fully active: IO and resync can be happening. |
| * When written to inactive array, starts with resync |
| * |
| * write-pending |
| * clean, but writes are blocked waiting for 'active' to be written. |
| * |
| * active-idle |
| * like active, but no writes have been seen for a while (100msec). |
| * |
| */ |
| enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, |
| write_pending, active_idle, bad_word}; |
| static char *array_states[] = { |
| "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
| "write-pending", "active-idle", NULL }; |
| |
| static int match_word(const char *word, char **list) |
| { |
| int n; |
| for (n=0; list[n]; n++) |
| if (cmd_match(word, list[n])) |
| break; |
| return n; |
| } |
| |
| static ssize_t |
| array_state_show(struct mddev *mddev, char *page) |
| { |
| enum array_state st = inactive; |
| |
| if (mddev->pers) |
| switch(mddev->ro) { |
| case 1: |
| st = readonly; |
| break; |
| case 2: |
| st = read_auto; |
| break; |
| case 0: |
| if (mddev->in_sync) |
| st = clean; |
| else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
| st = write_pending; |
| else if (mddev->safemode) |
| st = active_idle; |
| else |
| st = active; |
| } |
| else { |
| if (list_empty(&mddev->disks) && |
| mddev->raid_disks == 0 && |
| mddev->dev_sectors == 0) |
| st = clear; |
| else |
| st = inactive; |
| } |
| return sprintf(page, "%s\n", array_states[st]); |
| } |
| |
| static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev); |
| static int md_set_readonly(struct mddev * mddev, struct block_device *bdev); |
| static int do_md_run(struct mddev * mddev); |
| static int restart_array(struct mddev *mddev); |
| |
| static ssize_t |
| array_state_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| int err = -EINVAL; |
| enum array_state st = match_word(buf, array_states); |
| switch(st) { |
| case bad_word: |
| break; |
| case clear: |
| /* stopping an active array */ |
| err = do_md_stop(mddev, 0, NULL); |
| break; |
| case inactive: |
| /* stopping an active array */ |
| if (mddev->pers) |
| err = do_md_stop(mddev, 2, NULL); |
| else |
| err = 0; /* already inactive */ |
| break; |
| case suspended: |
| break; /* not supported yet */ |
| case readonly: |
| if (mddev->pers) |
| err = md_set_readonly(mddev, NULL); |
| else { |
| mddev->ro = 1; |
| set_disk_ro(mddev->gendisk, 1); |
| err = do_md_run(mddev); |
| } |
| break; |
| case read_auto: |
| if (mddev->pers) { |
| if (mddev->ro == 0) |
| err = md_set_readonly(mddev, NULL); |
| else if (mddev->ro == 1) |
| err = restart_array(mddev); |
| if (err == 0) { |
| mddev->ro = 2; |
| set_disk_ro(mddev->gendisk, 0); |
| } |
| } else { |
| mddev->ro = 2; |
| err = do_md_run(mddev); |
| } |
| break; |
| case clean: |
| if (mddev->pers) { |
| restart_array(mddev); |
| spin_lock_irq(&mddev->write_lock); |
| if (atomic_read(&mddev->writes_pending) == 0) { |
| if (mddev->in_sync == 0) { |
| mddev->in_sync = 1; |
| if (mddev->safemode == 1) |
| mddev->safemode = 0; |
| set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| } |
| err = 0; |
| } else |
| err = -EBUSY; |
| spin_unlock_irq(&mddev->write_lock); |
| } else |
| err = -EINVAL; |
| break; |
| case active: |
| if (mddev->pers) { |
| restart_array(mddev); |
| clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
| wake_up(&mddev->sb_wait); |
| err = 0; |
| } else { |
| mddev->ro = 0; |
| set_disk_ro(mddev->gendisk, 0); |
| err = do_md_run(mddev); |
| } |
| break; |
| case write_pending: |
| case active_idle: |
| /* these cannot be set */ |
| break; |
| } |
| if (err) |
| return err; |
| else { |
| if (mddev->hold_active == UNTIL_IOCTL) |
| mddev->hold_active = 0; |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| return len; |
| } |
| } |
| static struct md_sysfs_entry md_array_state = |
| __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
| |
| static ssize_t |
| max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
| return sprintf(page, "%d\n", |
| atomic_read(&mddev->max_corr_read_errors)); |
| } |
| |
| static ssize_t |
| max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char *e; |
| unsigned long n = simple_strtoul(buf, &e, 10); |
| |
| if (*buf && (*e == 0 || *e == '\n')) { |
| atomic_set(&mddev->max_corr_read_errors, n); |
| return len; |
| } |
| return -EINVAL; |
| } |
| |
| static struct md_sysfs_entry max_corr_read_errors = |
| __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, |
| max_corrected_read_errors_store); |
| |
| static ssize_t |
| null_show(struct mddev *mddev, char *page) |
| { |
| return -EINVAL; |
| } |
| |
| static ssize_t |
| new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| /* buf must be %d:%d\n? giving major and minor numbers */ |
| /* The new device is added to the array. |
| * If the array has a persistent superblock, we read the |
| * superblock to initialise info and check validity. |
| * Otherwise, only checking done is that in bind_rdev_to_array, |
| * which mainly checks size. |
| */ |
| char *e; |
| int major = simple_strtoul(buf, &e, 10); |
| int minor; |
| dev_t dev; |
| struct md_rdev *rdev; |
| int err; |
| |
| if (!*buf || *e != ':' || !e[1] || e[1] == '\n') |
| return -EINVAL; |
| minor = simple_strtoul(e+1, &e, 10); |
| if (*e && *e != '\n') |
| return -EINVAL; |
| dev = MKDEV(major, minor); |
| if (major != MAJOR(dev) || |
| minor != MINOR(dev)) |
| return -EOVERFLOW; |
| |
| |
| if (mddev->persistent) { |
| rdev = md_import_device(dev, mddev->major_version, |
| mddev->minor_version); |
| if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { |
| struct md_rdev *rdev0 |
| = list_entry(mddev->disks.next, |
| struct md_rdev, same_set); |
| err = super_types[mddev->major_version] |
| .load_super(rdev, rdev0, mddev->minor_version); |
| if (err < 0) |
| goto out; |
| } |
| } else if (mddev->external) |
| rdev = md_import_device(dev, -2, -1); |
| else |
| rdev = md_import_device(dev, -1, -1); |
| |
| if (IS_ERR(rdev)) |
| return PTR_ERR(rdev); |
| err = bind_rdev_to_array(rdev, mddev); |
| out: |
| if (err) |
| export_rdev(rdev); |
| return err ? err : len; |
| } |
| |
| static struct md_sysfs_entry md_new_device = |
| __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
| |
| static ssize_t |
| bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char *end; |
| unsigned long chunk, end_chunk; |
| |
| if (!mddev->bitmap) |
| goto out; |
| /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ |
| while (*buf) { |
| chunk = end_chunk = simple_strtoul(buf, &end, 0); |
| if (buf == end) break; |
| if (*end == '-') { /* range */ |
| buf = end + 1; |
| end_chunk = simple_strtoul(buf, &end, 0); |
| if (buf == end) break; |
| } |
| if (*end && !isspace(*end)) break; |
| bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); |
| buf = skip_spaces(end); |
| } |
| bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ |
| out: |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_bitmap = |
| __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); |
| |
| static ssize_t |
| size_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%llu\n", |
| (unsigned long long)mddev->dev_sectors / 2); |
| } |
| |
| static int update_size(struct mddev *mddev, sector_t num_sectors); |
| |
| static ssize_t |
| size_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| /* If array is inactive, we can reduce the component size, but |
| * not increase it (except from 0). |
| * If array is active, we can try an on-line resize |
| */ |
| sector_t sectors; |
| int err = strict_blocks_to_sectors(buf, §ors); |
| |
| if (err < 0) |
| return err; |
| if (mddev->pers) { |
| err = update_size(mddev, sectors); |
| md_update_sb(mddev, 1); |
| } else { |
| if (mddev->dev_sectors == 0 || |
| mddev->dev_sectors > sectors) |
| mddev->dev_sectors = sectors; |
| else |
| err = -ENOSPC; |
| } |
| return err ? err : len; |
| } |
| |
| static struct md_sysfs_entry md_size = |
| __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
| |
| |
| /* Metadata version. |
| * This is one of |
| * 'none' for arrays with no metadata (good luck...) |
| * 'external' for arrays with externally managed metadata, |
| * or N.M for internally known formats |
| */ |
| static ssize_t |
| metadata_show(struct mddev *mddev, char *page) |
| { |
| if (mddev->persistent) |
| return sprintf(page, "%d.%d\n", |
| mddev->major_version, mddev->minor_version); |
| else if (mddev->external) |
| return sprintf(page, "external:%s\n", mddev->metadata_type); |
| else |
| return sprintf(page, "none\n"); |
| } |
| |
| static ssize_t |
| metadata_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| int major, minor; |
| char *e; |
| /* Changing the details of 'external' metadata is |
| * always permitted. Otherwise there must be |
| * no devices attached to the array. |
| */ |
| if (mddev->external && strncmp(buf, "external:", 9) == 0) |
| ; |
| else if (!list_empty(&mddev->disks)) |
| return -EBUSY; |
| |
| if (cmd_match(buf, "none")) { |
| mddev->persistent = 0; |
| mddev->external = 0; |
| mddev->major_version = 0; |
| mddev->minor_version = 90; |
| return len; |
| } |
| if (strncmp(buf, "external:", 9) == 0) { |
| size_t namelen = len-9; |
| if (namelen >= sizeof(mddev->metadata_type)) |
| namelen = sizeof(mddev->metadata_type)-1; |
| strncpy(mddev->metadata_type, buf+9, namelen); |
| mddev->metadata_type[namelen] = 0; |
| if (namelen && mddev->metadata_type[namelen-1] == '\n') |
| mddev->metadata_type[--namelen] = 0; |
| mddev->persistent = 0; |
| mddev->external = 1; |
| mddev->major_version = 0; |
| mddev->minor_version = 90; |
| return len; |
| } |
| major = simple_strtoul(buf, &e, 10); |
| if (e==buf || *e != '.') |
| return -EINVAL; |
| buf = e+1; |
| minor = simple_strtoul(buf, &e, 10); |
| if (e==buf || (*e && *e != '\n') ) |
| return -EINVAL; |
| if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
| return -ENOENT; |
| mddev->major_version = major; |
| mddev->minor_version = minor; |
| mddev->persistent = 1; |
| mddev->external = 0; |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_metadata = |
| __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
| |
| static ssize_t |
| action_show(struct mddev *mddev, char *page) |
| { |
| char *type = "idle"; |
| if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
| type = "frozen"; |
| else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
| if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| type = "reshape"; |
| else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| type = "resync"; |
| else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) |
| type = "check"; |
| else |
| type = "repair"; |
| } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
| type = "recover"; |
| } |
| return sprintf(page, "%s\n", type); |
| } |
| |
| static ssize_t |
| action_store(struct mddev *mddev, const char *page, size_t len) |
| { |
| if (!mddev->pers || !mddev->pers->sync_request) |
| return -EINVAL; |
| |
| if (cmd_match(page, "frozen")) |
| set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| else |
| clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| |
| if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { |
| if (mddev->sync_thread) { |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| md_reap_sync_thread(mddev); |
| } |
| } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
| return -EBUSY; |
| else if (cmd_match(page, "resync")) |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| else if (cmd_match(page, "recover")) { |
| set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| } else if (cmd_match(page, "reshape")) { |
| int err; |
| if (mddev->pers->start_reshape == NULL) |
| return -EINVAL; |
| err = mddev->pers->start_reshape(mddev); |
| if (err) |
| return err; |
| sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| } else { |
| if (cmd_match(page, "check")) |
| set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| else if (!cmd_match(page, "repair")) |
| return -EINVAL; |
| set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
| set_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| } |
| if (mddev->ro == 2) { |
| /* A write to sync_action is enough to justify |
| * canceling read-auto mode |
| */ |
| mddev->ro = 0; |
| md_wakeup_thread(mddev->sync_thread); |
| } |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| sysfs_notify_dirent_safe(mddev->sysfs_action); |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_scan_mode = |
| __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
| |
| static ssize_t |
| last_sync_action_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%s\n", mddev->last_sync_action); |
| } |
| |
| static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); |
| |
| static ssize_t |
| mismatch_cnt_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%llu\n", |
| (unsigned long long) |
| atomic64_read(&mddev->resync_mismatches)); |
| } |
| |
| static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
| |
| static ssize_t |
| sync_min_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%d (%s)\n", speed_min(mddev), |
| mddev->sync_speed_min ? "local": "system"); |
| } |
| |
| static ssize_t |
| sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| int min; |
| char *e; |
| if (strncmp(buf, "system", 6)==0) { |
| mddev->sync_speed_min = 0; |
| return len; |
| } |
| min = simple_strtoul(buf, &e, 10); |
| if (buf == e || (*e && *e != '\n') || min <= 0) |
| return -EINVAL; |
| mddev->sync_speed_min = min; |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_sync_min = |
| __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); |
| |
| static ssize_t |
| sync_max_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%d (%s)\n", speed_max(mddev), |
| mddev->sync_speed_max ? "local": "system"); |
| } |
| |
| static ssize_t |
| sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| int max; |
| char *e; |
| if (strncmp(buf, "system", 6)==0) { |
| mddev->sync_speed_max = 0; |
| return len; |
| } |
| max = simple_strtoul(buf, &e, 10); |
| if (buf == e || (*e && *e != '\n') || max <= 0) |
| return -EINVAL; |
| mddev->sync_speed_max = max; |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_sync_max = |
| __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); |
| |
| static ssize_t |
| degraded_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%d\n", mddev->degraded); |
| } |
| static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); |
| |
| static ssize_t |
| sync_force_parallel_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%d\n", mddev->parallel_resync); |
| } |
| |
| static ssize_t |
| sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| long n; |
| |
| if (kstrtol(buf, 10, &n)) |
| return -EINVAL; |
| |
| if (n != 0 && n != 1) |
| return -EINVAL; |
| |
| mddev->parallel_resync = n; |
| |
| if (mddev->sync_thread) |
| wake_up(&resync_wait); |
| |
| return len; |
| } |
| |
| /* force parallel resync, even with shared block devices */ |
| static struct md_sysfs_entry md_sync_force_parallel = |
| __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, |
| sync_force_parallel_show, sync_force_parallel_store); |
| |
| static ssize_t |
| sync_speed_show(struct mddev *mddev, char *page) |
| { |
| unsigned long resync, dt, db; |
| if (mddev->curr_resync == 0) |
| return sprintf(page, "none\n"); |
| resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
| dt = (jiffies - mddev->resync_mark) / HZ; |
| if (!dt) dt++; |
| db = resync - mddev->resync_mark_cnt; |
| return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ |
| } |
| |
| static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
| |
| static ssize_t |
| sync_completed_show(struct mddev *mddev, char *page) |
| { |
| unsigned long long max_sectors, resync; |
| |
| if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| return sprintf(page, "none\n"); |
| |
| if (mddev->curr_resync == 1 || |
| mddev->curr_resync == 2) |
| return sprintf(page, "delayed\n"); |
| |
| if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
| test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| max_sectors = mddev->resync_max_sectors; |
| else |
| max_sectors = mddev->dev_sectors; |
| |
| resync = mddev->curr_resync_completed; |
| return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
| } |
| |
| static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
| |
| static ssize_t |
| min_sync_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%llu\n", |
| (unsigned long long)mddev->resync_min); |
| } |
| static ssize_t |
| min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| unsigned long long min; |
| if (kstrtoull(buf, 10, &min)) |
| return -EINVAL; |
| if (min > mddev->resync_max) |
| return -EINVAL; |
| if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| return -EBUSY; |
| |
| /* Must be a multiple of chunk_size */ |
| if (mddev->chunk_sectors) { |
| sector_t temp = min; |
| if (sector_div(temp, mddev->chunk_sectors)) |
| return -EINVAL; |
| } |
| mddev->resync_min = min; |
| |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_min_sync = |
| __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); |
| |
| static ssize_t |
| max_sync_show(struct mddev *mddev, char *page) |
| { |
| if (mddev->resync_max == MaxSector) |
| return sprintf(page, "max\n"); |
| else |
| return sprintf(page, "%llu\n", |
| (unsigned long long)mddev->resync_max); |
| } |
| static ssize_t |
| max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| if (strncmp(buf, "max", 3) == 0) |
| mddev->resync_max = MaxSector; |
| else { |
| unsigned long long max; |
| if (kstrtoull(buf, 10, &max)) |
| return -EINVAL; |
| if (max < mddev->resync_min) |
| return -EINVAL; |
| if (max < mddev->resync_max && |
| mddev->ro == 0 && |
| test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| return -EBUSY; |
| |
| /* Must be a multiple of chunk_size */ |
| if (mddev->chunk_sectors) { |
| sector_t temp = max; |
| if (sector_div(temp, mddev->chunk_sectors)) |
| return -EINVAL; |
| } |
| mddev->resync_max = max; |
| } |
| wake_up(&mddev->recovery_wait); |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_max_sync = |
| __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); |
| |
| static ssize_t |
| suspend_lo_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); |
| } |
| |
| static ssize_t |
| suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char *e; |
| unsigned long long new = simple_strtoull(buf, &e, 10); |
| unsigned long long old = mddev->suspend_lo; |
| |
| if (mddev->pers == NULL || |
| mddev->pers->quiesce == NULL) |
| return -EINVAL; |
| if (buf == e || (*e && *e != '\n')) |
| return -EINVAL; |
| |
| mddev->suspend_lo = new; |
| if (new >= old) |
| /* Shrinking suspended region */ |
| mddev->pers->quiesce(mddev, 2); |
| else { |
| /* Expanding suspended region - need to wait */ |
| mddev->pers->quiesce(mddev, 1); |
| mddev->pers->quiesce(mddev, 0); |
| } |
| return len; |
| } |
| static struct md_sysfs_entry md_suspend_lo = |
| __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); |
| |
| |
| static ssize_t |
| suspend_hi_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); |
| } |
| |
| static ssize_t |
| suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| char *e; |
| unsigned long long new = simple_strtoull(buf, &e, 10); |
| unsigned long long old = mddev->suspend_hi; |
| |
| if (mddev->pers == NULL || |
| mddev->pers->quiesce == NULL) |
| return -EINVAL; |
| if (buf == e || (*e && *e != '\n')) |
| return -EINVAL; |
| |
| mddev->suspend_hi = new; |
| if (new <= old) |
| /* Shrinking suspended region */ |
| mddev->pers->quiesce(mddev, 2); |
| else { |
| /* Expanding suspended region - need to wait */ |
| mddev->pers->quiesce(mddev, 1); |
| mddev->pers->quiesce(mddev, 0); |
| } |
| return len; |
| } |
| static struct md_sysfs_entry md_suspend_hi = |
| __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); |
| |
| static ssize_t |
| reshape_position_show(struct mddev *mddev, char *page) |
| { |
| if (mddev->reshape_position != MaxSector) |
| return sprintf(page, "%llu\n", |
| (unsigned long long)mddev->reshape_position); |
| strcpy(page, "none\n"); |
| return 5; |
| } |
| |
| static ssize_t |
| reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| struct md_rdev *rdev; |
| char *e; |
| unsigned long long new = simple_strtoull(buf, &e, 10); |
| if (mddev->pers) |
| return -EBUSY; |
| if (buf == e || (*e && *e != '\n')) |
| return -EINVAL; |
| mddev->reshape_position = new; |
| mddev->delta_disks = 0; |
| mddev->reshape_backwards = 0; |
| mddev->new_level = mddev->level; |
| mddev->new_layout = mddev->layout; |
| mddev->new_chunk_sectors = mddev->chunk_sectors; |
| rdev_for_each(rdev, mddev) |
| rdev->new_data_offset = rdev->data_offset; |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_reshape_position = |
| __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, |
| reshape_position_store); |
| |
| static ssize_t |
| reshape_direction_show(struct mddev *mddev, char *page) |
| { |
| return sprintf(page, "%s\n", |
| mddev->reshape_backwards ? "backwards" : "forwards"); |
| } |
| |
| static ssize_t |
| reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| int backwards = 0; |
| if (cmd_match(buf, "forwards")) |
| backwards = 0; |
| else if (cmd_match(buf, "backwards")) |
| backwards = 1; |
| else |
| return -EINVAL; |
| if (mddev->reshape_backwards == backwards) |
| return len; |
| |
| /* check if we are allowed to change */ |
| if (mddev->delta_disks) |
| return -EBUSY; |
| |
| if (mddev->persistent && |
| mddev->major_version == 0) |
| return -EINVAL; |
| |
| mddev->reshape_backwards = backwards; |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_reshape_direction = |
| __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, |
| reshape_direction_store); |
| |
| static ssize_t |
| array_size_show(struct mddev *mddev, char *page) |
| { |
| if (mddev->external_size) |
| return sprintf(page, "%llu\n", |
| (unsigned long long)mddev->array_sectors/2); |
| else |
| return sprintf(page, "default\n"); |
| } |
| |
| static ssize_t |
| array_size_store(struct mddev *mddev, const char *buf, size_t len) |
| { |
| sector_t sectors; |
| |
| if (strncmp(buf, "default", 7) == 0) { |
| if (mddev->pers) |
| sectors = mddev->pers->size(mddev, 0, 0); |
| else |
| sectors = mddev->array_sectors; |
| |
| mddev->external_size = 0; |
| } else { |
| if (strict_blocks_to_sectors(buf, §ors) < 0) |
| return -EINVAL; |
| if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) |
| return -E2BIG; |
| |
| mddev->external_size = 1; |
| } |
| |
| mddev->array_sectors = sectors; |
| if (mddev->pers) { |
| set_capacity(mddev->gendisk, mddev->array_sectors); |
| revalidate_disk(mddev->gendisk); |
| } |
| return len; |
| } |
| |
| static struct md_sysfs_entry md_array_size = |
| __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, |
| array_size_store); |
| |
| static struct attribute *md_default_attrs[] = { |
| &md_level.attr, |
| &md_layout.attr, |
| &md_raid_disks.attr, |
| &md_chunk_size.attr, |
| &md_size.attr, |
| &md_resync_start.attr, |
| &md_metadata.attr, |
| &md_new_device.attr, |
| &md_safe_delay.attr, |
| &md_array_state.attr, |
| &md_reshape_position.attr, |
| &md_reshape_direction.attr, |
| &md_array_size.attr, |
| &max_corr_read_errors.attr, |
| NULL, |
| }; |
| |
| static struct attribute *md_redundancy_attrs[] = { |
| &md_scan_mode.attr, |
| &md_last_scan_mode.attr, |
| &md_mismatches.attr, |
| &md_sync_min.attr, |
| &md_sync_max.attr, |
| &md_sync_speed.attr, |
| &md_sync_force_parallel.attr, |
| &md_sync_completed.attr, |
| &md_min_sync.attr, |
| &md_max_sync.attr, |
| &md_suspend_lo.attr, |
| &md_suspend_hi.attr, |
| &md_bitmap.attr, |
| &md_degraded.attr, |
| NULL, |
| }; |
| static struct attribute_group md_redundancy_group = { |
| .name = NULL, |
| .attrs = md_redundancy_attrs, |
| }; |
| |
| |
| static ssize_t |
| md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) |
| { |
| struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); |
| struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
| ssize_t rv; |
| |
| if (!entry->show) |
| return -EIO; |
| spin_lock(&all_mddevs_lock); |
| if (list_empty(&mddev->all_mddevs)) { |
| spin_unlock(&all_mddevs_lock); |
| return -EBUSY; |
| } |
| mddev_get(mddev); |
| spin_unlock(&all_mddevs_lock); |
| |
| rv = mddev_lock(mddev); |
| if (!rv) { |
| rv = entry->show(mddev, page); |
| mddev_unlock(mddev); |
| } |
| mddev_put(mddev); |
| return rv; |
| } |
| |
| static ssize_t |
| md_attr_store(struct kobject *kobj, struct attribute *attr, |
| const char *page, size_t length) |
| { |
| struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); |
| struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
| ssize_t rv; |
| |
| if (!entry->store) |
| return -EIO; |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EACCES; |
| spin_lock(&all_mddevs_lock); |
| if (list_empty(&mddev->all_mddevs)) { |
| spin_unlock(&all_mddevs_lock); |
| return -EBUSY; |
| } |
| mddev_get(mddev); |
| spin_unlock(&all_mddevs_lock); |
| if (entry->store == new_dev_store) |
| flush_workqueue(md_misc_wq); |
| rv = mddev_lock(mddev); |
| if (!rv) { |
| rv = entry->store(mddev, page, length); |
| mddev_unlock(mddev); |
| } |
| mddev_put(mddev); |
| return rv; |
| } |
| |
| static void md_free(struct kobject *ko) |
| { |
| struct mddev *mddev = container_of(ko, struct mddev, kobj); |
| |
| if (mddev->sysfs_state) |
| sysfs_put(mddev->sysfs_state); |
| |
| if (mddev->gendisk) { |
| del_gendisk(mddev->gendisk); |
| put_disk(mddev->gendisk); |
| } |
| if (mddev->queue) |
| blk_cleanup_queue(mddev->queue); |
| |
| kfree(mddev); |
| } |
| |
| static const struct sysfs_ops md_sysfs_ops = { |
| .show = md_attr_show, |
| .store = md_attr_store, |
| }; |
| static struct kobj_type md_ktype = { |
| .release = md_free, |
| .sysfs_ops = &md_sysfs_ops, |
| .default_attrs = md_default_attrs, |
| }; |
| |
| int mdp_major = 0; |
| |
| static void mddev_delayed_delete(struct work_struct *ws) |
| { |
| struct mddev *mddev = container_of(ws, struct mddev, del_work); |
| |
| sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
| kobject_del(&mddev->kobj); |
| kobject_put(&mddev->kobj); |
| } |
| |
| static int md_alloc(dev_t dev, char *name) |
| { |
| static DEFINE_MUTEX(disks_mutex); |
| struct mddev *mddev = mddev_find(dev); |
| struct gendisk *disk; |
| int partitioned; |
| int shift; |
| int unit; |
| int error; |
| |
| if (!mddev) |
| return -ENODEV; |
| |
| partitioned = (MAJOR(mddev->unit) != MD_MAJOR); |
| shift = partitioned ? MdpMinorShift : 0; |
| unit = MINOR(mddev->unit) >> shift; |
| |
| /* wait for any previous instance of this device to be |
| * completely removed (mddev_delayed_delete). |
| */ |
| flush_workqueue(md_misc_wq); |
| |
| mutex_lock(&disks_mutex); |
| error = -EEXIST; |
| if (mddev->gendisk) |
| goto abort; |
| |
| if (name) { |
| /* Need to ensure that 'name' is not a duplicate. |
| */ |
| struct mddev *mddev2; |
| spin_lock(&all_mddevs_lock); |
| |
| list_for_each_entry(mddev2, &all_mddevs, all_mddevs) |
| if (mddev2->gendisk && |
| strcmp(mddev2->gendisk->disk_name, name) == 0) { |
| spin_unlock(&all_mddevs_lock); |
| goto abort; |
| } |
| spin_unlock(&all_mddevs_lock); |
| } |
| |
| error = -ENOMEM; |
| mddev->queue = blk_alloc_queue(GFP_KERNEL); |
| if (!mddev->queue) |
| goto abort; |
| mddev->queue->queuedata = mddev; |
| |
| blk_queue_make_request(mddev->queue, md_make_request); |
| blk_set_stacking_limits(&mddev->queue->limits); |
| |
| disk = alloc_disk(1 << shift); |
| if (!disk) { |
| blk_cleanup_queue(mddev->queue); |
| mddev->queue = NULL; |
| goto abort; |
| } |
| disk->major = MAJOR(mddev->unit); |
| disk->first_minor = unit << shift; |
| if (name) |
| strcpy(disk->disk_name, name); |
| else if (partitioned) |
| sprintf(disk->disk_name, "md_d%d", unit); |
| else |
| sprintf(disk->disk_name, "md%d", unit); |
| disk->fops = &md_fops; |
| disk->private_data = mddev; |
| disk->queue = mddev->queue; |
| blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
| /* Allow extended partitions. This makes the |
| * 'mdp' device redundant, but we can't really |
| * remove it now. |
| */ |
| disk->flags |= GENHD_FL_EXT_DEVT; |
| mddev->gendisk = disk; |
| /* As soon as we call add_disk(), another thread could get |
| * through to md_open, so make sure it doesn't get too far |
| */ |
| mutex_lock(&mddev->open_mutex); |
| add_disk(disk); |
| |
| error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
| &disk_to_dev(disk)->kobj, "%s", "md"); |
| if (error) { |
| /* This isn't possible, but as kobject_init_and_add is marked |
| * __must_check, we must do something with the result |
| */ |
| printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
| disk->disk_name); |
| error = 0; |
| } |
| if (mddev->kobj.sd && |
| sysfs_create_group(&mddev->kobj, &md_bitmap_group)) |
| printk(KERN_DEBUG "pointless warning\n"); |
| mutex_unlock(&mddev->open_mutex); |
| abort: |
| mutex_unlock(&disks_mutex); |
| if (!error && mddev->kobj.sd) { |
| kobject_uevent(&mddev->kobj, KOBJ_ADD); |
| mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
| } |
| mddev_put(mddev); |
| return error; |
| } |
| |
| static struct kobject *md_probe(dev_t dev, int *part, void *data) |
| { |
| md_alloc(dev, NULL); |
| return NULL; |
| } |
| |
| static int add_named_array(const char *val, struct kernel_param *kp) |
| { |
| /* val must be "md_*" where * is not all digits. |
| * We allocate an array with a large free minor number, and |
| * set the name to val. val must not already be an active name. |
| */ |
| int len = strlen(val); |
| char buf[DISK_NAME_LEN]; |
| |
| while (len && val[len-1] == '\n') |
| len--; |
| if (len >= DISK_NAME_LEN) |
| return -E2BIG; |
| strlcpy(buf, val, len+1); |
| if (strncmp(buf, "md_", 3) != 0) |
| return -EINVAL; |
| return md_alloc(0, buf); |
| } |
| |
| static void md_safemode_timeout(unsigned long data) |
| { |
| struct mddev *mddev = (struct mddev *) data; |
| |
| if (!atomic_read(&mddev->writes_pending)) { |
| mddev->safemode = 1; |
| if (mddev->external) |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| } |
| md_wakeup_thread(mddev->thread); |
| } |
| |
| static int start_dirty_degraded; |
| |
| int md_run(struct mddev *mddev) |
| { |
| int err; |
| struct md_rdev *rdev; |
| struct md_personality *pers; |
| |
| if (list_empty(&mddev->disks)) |
| /* cannot run an array with no devices.. */ |
| return -EINVAL; |
| |
| if (mddev->pers) |
| return -EBUSY; |
| /* Cannot run until previous stop completes properly */ |
| if (mddev->sysfs_active) |
| return -EBUSY; |
| |
| /* |
| * Analyze all RAID superblock(s) |
| */ |
| if (!mddev->raid_disks) { |
| if (!mddev->persistent) |
| return -EINVAL; |
| analyze_sbs(mddev); |
| } |
| |
| if (mddev->level != LEVEL_NONE) |
| request_module("md-level-%d", mddev->level); |
| else if (mddev->clevel[0]) |
| request_module("md-%s", mddev->clevel); |
| |
| /* |
| * Drop all container device buffers, from now on |
| * the only valid external interface is through the md |
| * device. |
| */ |
| rdev_for_each(rdev, mddev) { |
| if (test_bit(Faulty, &rdev->flags)) |
| continue; |
| sync_blockdev(rdev->bdev); |
| invalidate_bdev(rdev->bdev); |
| |
| /* perform some consistency tests on the device. |
| * We don't want the data to overlap the metadata, |
| * Internal Bitmap issues have been handled elsewhere. |
| */ |
| if (rdev->meta_bdev) { |
| /* Nothing to check */; |
| } else if (rdev->data_offset < rdev->sb_start) { |
| if (mddev->dev_sectors && |
| rdev->data_offset + mddev->dev_sectors |
| > rdev->sb_start) { |
| printk("md: %s: data overlaps metadata\n", |
| mdname(mddev)); |
| return -EINVAL; |
| } |
| } else { |
| if (rdev->sb_start + rdev->sb_size/512 |
| > rdev->data_offset) { |
| printk("md: %s: metadata overlaps data\n", |
| mdname(mddev)); |
| return -EINVAL; |
| } |
| } |
| sysfs_notify_dirent_safe(rdev->sysfs_state); |
| } |
| |
| if (mddev->bio_set == NULL) |
| mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
| |
| 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) |
| printk(KERN_WARNING "md: personality for level %d is not loaded!\n", |
| mddev->level); |
| else |
| printk(KERN_WARNING "md: personality for level %s is not loaded!\n", |
| mddev->clevel); |
| return -EINVAL; |
| } |
| mddev->pers = pers; |
| spin_unlock(&pers_lock); |
| if (mddev->level != pers->level) { |
| mddev->level = pers->level; |
| mddev->new_level = pers->level; |
| } |
| strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
| |
| if (mddev->reshape_position != MaxSector && |
| pers->start_reshape == NULL) { |
| /* This personality cannot handle reshaping... */ |
| mddev->pers = NULL; |
| module_put(pers->owner); |
| return -EINVAL; |
| } |
| |
| if (pers->sync_request) { |
| /* Warn if this is a potentially silly |
| * configuration. |
| */ |
| char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| struct md_rdev *rdev2; |
| int warned = 0; |
| |
| rdev_for_each(rdev, mddev) |
| rdev_for_each(rdev2, mddev) { |
| if (rdev < rdev2 && |
| rdev->bdev->bd_contains == |
| rdev2->bdev->bd_contains) { |
| printk(KERN_WARNING |
| "%s: WARNING: %s appears to be" |
| " on the same physical disk as" |
| " %s.\n", |
| mdname(mddev), |
| bdevname(rdev->bdev,b), |
| bdevname(rdev2->bdev,b2)); |
| warned = 1; |
| } |
| } |
| |
| if (warned) |
| printk(KERN_WARNING |
| "True protection against single-disk" |
| " failure might be compromised.\n"); |
| } |
| |
| mddev->recovery = 0; |
| /* may be over-ridden by personality */ |
| mddev->resync_max_sectors = mddev->dev_sectors; |
| |
| mddev->ok_start_degraded = start_dirty_degraded; |
| |
| if (start_readonly && mddev->ro == 0) |
| mddev->ro = 2; /* read-only, but switch on first write */ |
| |
| err = mddev->pers->run(mddev); |
| if (err) |
| printk(KERN_ERR "md: pers->run() failed ...\n"); |
| else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
| WARN_ONCE(!mddev->external_size, "%s: default size too small," |
| " but 'external_size' not in effect?\n", __func__); |
| printk(KERN_ERR |
| "md: invalid array_size %llu > default size %llu\n", |
| (unsigned long long)mddev->array_sectors / 2, |
| (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); |
| err = -EINVAL; |
| mddev->pers->stop(mddev); |
| } |
| if (err == 0 && mddev->pers->sync_request && |
| (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
| err = bitmap_create(mddev); |
| if (err) { |
| printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
| mdname(mddev), err); |
| mddev->pers->stop(mddev); |
| } |
| } |
| if (err) { |
| module_put(mddev->pers->owner); |
| mddev->pers = NULL; |
| bitmap_destroy(mddev); |
| return err; |
| } |
| if (mddev->pers->sync_request) { |
| if (mddev->kobj.sd && |
| sysfs_create_group(&mddev->kobj, &md_redundancy_group)) |
| printk(KERN_WARNING |
| "md: cannot register extra attributes for %s\n", |
| mdname(mddev)); |
| mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
| } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
| mddev->ro = 0; |
| |
| atomic_set(&mddev->writes_pending,0); |
| atomic_set(&mddev->max_corr_read_errors, |
| MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); |
| mddev->safemode = 0; |
| mddev->safemode_timer.function = md_safemode_timeout; |
| mddev->safemode_timer.data = (unsigned long) mddev; |
| mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
| mddev->in_sync = 1; |
| smp_wmb(); |
| mddev->ready = 1; |
| rdev_for_each(rdev, mddev) |
| if (rdev->raid_disk >= 0) |
| if (sysfs_link_rdev(mddev, rdev)) |
| /* failure here is OK */; |
| |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| |
| if (mddev->flags & MD_UPDATE_SB_FLAGS) |
| md_update_sb(mddev, 0); |
| |
| md_new_event(mddev); |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| sysfs_notify_dirent_safe(mddev->sysfs_action); |
| sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(md_run); |
| |
| static int do_md_run(struct mddev *mddev) |
| { |
| int err; |
| |
| err = md_run(mddev); |
| if (err) |
| goto out; |
| err = bitmap_load(mddev); |
| if (err) { |
| bitmap_destroy(mddev); |
| goto out; |
| } |
| |
| md_wakeup_thread(mddev->thread); |
| md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ |
| |
| set_capacity(mddev->gendisk, mddev->array_sectors); |
| revalidate_disk(mddev->gendisk); |
| mddev->changed = 1; |
| kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
| out: |
| return err; |
| } |
| |
| static int restart_array(struct mddev *mddev) |
| { |
| struct gendisk *disk = mddev->gendisk; |
| |
| /* Complain if it has no devices */ |
| if (list_empty(&mddev->disks)) |
| return -ENXIO; |
| if (!mddev->pers) |
| return -EINVAL; |
| if (!mddev->ro) |
| return -EBUSY; |
| mddev->safemode = 0; |
| mddev->ro = 0; |
| set_disk_ro(disk, 0); |
| printk(KERN_INFO "md: %s switched to read-write mode.\n", |
| mdname(mddev)); |
| /* Kick recovery or resync if necessary */ |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| md_wakeup_thread(mddev->sync_thread); |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| return 0; |
| } |
| |
| /* similar to deny_write_access, but accounts for our holding a reference |
| * to the file ourselves */ |
| static int deny_bitmap_write_access(struct file * file) |
| { |
| struct inode *inode = file->f_mapping->host; |
| |
| spin_lock(&inode->i_lock); |
| if (atomic_read(&inode->i_writecount) > 1) { |
| spin_unlock(&inode->i_lock); |
| return -ETXTBSY; |
| } |
| atomic_set(&inode->i_writecount, -1); |
| spin_unlock(&inode->i_lock); |
| |
| return 0; |
| } |
| |
| void restore_bitmap_write_access(struct file *file) |
| { |
| struct inode *inode = file->f_mapping->host; |
| |
| spin_lock(&inode->i_lock); |
| atomic_set(&inode->i_writecount, 1); |
| spin_unlock(&inode->i_lock); |
| } |
| |
| static void md_clean(struct mddev *mddev) |
| { |
| mddev->array_sectors = 0; |
| mddev->external_size = 0; |
| mddev->dev_sectors = 0; |
| mddev->raid_disks = 0; |
| mddev->recovery_cp = 0; |
| mddev->resync_min = 0; |
| mddev->resync_max = MaxSector; |
| mddev->reshape_position = MaxSector; |
| mddev->external = 0; |
| mddev->persistent = 0; |
| mddev->level = LEVEL_NONE; |
| mddev->clevel[0] = 0; |
| mddev->flags = 0; |
| mddev->ro = 0; |
| mddev->metadata_type[0] = 0; |
| mddev->chunk_sectors = 0; |
| mddev->ctime = mddev->utime = 0; |
| mddev->layout = 0; |
| mddev->max_disks = 0; |
| mddev->events = 0; |
| mddev->can_decrease_events = 0; |
| mddev->delta_disks = 0; |
| mddev->reshape_backwards = 0; |
| mddev->new_level = LEVEL_NONE; |
| mddev->new_layout = 0; |
| mddev->new_chunk_sectors = 0; |
| mddev->curr_resync = 0; |
| atomic64_set(&mddev->resync_mismatches, 0); |
| mddev->suspend_lo = mddev->suspend_hi = 0; |
| mddev->sync_speed_min = mddev->sync_speed_max = 0; |
| mddev->recovery = 0; |
| mddev->in_sync = 0; |
| mddev->changed = 0; |
| mddev->degraded = 0; |
| mddev->safemode = 0; |
| mddev->merge_check_needed = 0; |
| mddev->bitmap_info.offset = 0; |
| mddev->bitmap_info.default_offset = 0; |
| mddev->bitmap_info.default_space = 0; |
| mddev->bitmap_info.chunksize = 0; |
| mddev->bitmap_info.daemon_sleep = 0; |
| mddev->bitmap_info.max_write_behind = 0; |
| } |
| |
| static void __md_stop_writes(struct mddev *mddev) |
| { |
| set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| if (mddev->sync_thread) { |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| md_reap_sync_thread(mddev); |
| } |
| |
| del_timer_sync(&mddev->safemode_timer); |
| |
| bitmap_flush(mddev); |
| md_super_wait(mddev); |
| |
| if (mddev->ro == 0 && |
| (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { |
| /* mark array as shutdown cleanly */ |
| mddev->in_sync = 1; |
| md_update_sb(mddev, 1); |
| } |
| } |
| |
| void md_stop_writes(struct mddev *mddev) |
| { |
| mddev_lock_nointr(mddev); |
| __md_stop_writes(mddev); |
| mddev_unlock(mddev); |
| } |
| EXPORT_SYMBOL_GPL(md_stop_writes); |
| |
| static void __md_stop(struct mddev *mddev) |
| { |
| mddev->ready = 0; |
| mddev->pers->stop(mddev); |
| if (mddev->pers->sync_request && mddev->to_remove == NULL) |
| mddev->to_remove = &md_redundancy_group; |
| module_put(mddev->pers->owner); |
| mddev->pers = NULL; |
| clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| } |
| |
| void md_stop(struct mddev *mddev) |
| { |
| /* stop the array and free an attached data structures. |
| * This is called from dm-raid |
| */ |
| __md_stop(mddev); |
| bitmap_destroy(mddev); |
| if (mddev->bio_set) |
| bioset_free(mddev->bio_set); |
| } |
| |
| EXPORT_SYMBOL_GPL(md_stop); |
| |
| static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
| { |
| int err = 0; |
| int did_freeze = 0; |
| |
| if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { |
| did_freeze = 1; |
| set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| } |
| if (mddev->sync_thread) { |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| /* 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); |
| mddev_lock_nointr(mddev); |
| |
| mutex_lock(&mddev->open_mutex); |
| if (atomic_read(&mddev->openers) > !!bdev || |
| mddev->sync_thread || |
| (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
| printk("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); |
| |
| err = -ENXIO; |
| if (mddev->ro==1) |
| goto out; |
| mddev->ro = 1; |
| set_disk_ro(mddev->gendisk, 1); |
| 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; |
| } |
| |
| /* mode: |
| * 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) |
| { |
| struct gendisk *disk = mddev->gendisk; |
| struct md_rdev *rdev; |
| int did_freeze = 0; |
| |
| if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { |
| did_freeze = 1; |
| set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| } |
| if (mddev->sync_thread) { |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| /* 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); |
| mddev_lock_nointr(mddev); |
| |
| mutex_lock(&mddev->open_mutex); |
| if (atomic_read(&mddev->openers) > !!bdev || |
| mddev->sysfs_active || |
| mddev->sync_thread || |
| (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
| printk("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; |
| } |
| if (mddev->pers) { |
| if (mddev->ro) |
| set_disk_ro(disk, 0); |
| |
| __md_stop_writes(mddev); |
| __md_stop(mddev); |
| mddev->queue->merge_bvec_fn = NULL; |
| mddev->queue->backing_dev_info.congested_fn = NULL; |
| |
| /* tell userspace to handle 'inactive' */ |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| |
| rdev_for_each(rdev, mddev) |
| if (rdev->raid_disk >= 0) |
| sysfs_unlink_rdev(mddev, rdev); |
| |
| set_capacity(disk, 0); |
| mutex_unlock(&mddev->open_mutex); |
| mddev->changed = 1; |
| revalidate_disk(disk); |
| |
| if (mddev->ro) |
| mddev->ro = 0; |
| } else |
| mutex_unlock(&mddev->open_mutex); |
| /* |
| * Free resources if final stop |
| */ |
| if (mode == 0) { |
| printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
| |
| bitmap_destroy(mddev); |
| if (mddev->bitmap_info.file) { |
| restore_bitmap_write_access(mddev->bitmap_info.file); |
| fput(mddev->bitmap_info.file); |
| mddev->bitmap_info.file = NULL; |
| } |
| mddev->bitmap_info.offset = 0; |
| |
| export_array(mddev); |
| |
| md_clean(mddev); |
| kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
| if (mddev->hold_active == UNTIL_STOP) |
| mddev->hold_active = 0; |
| } |
| blk_integrity_unregister(disk); |
| md_new_event(mddev); |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| return 0; |
| } |
| |
| #ifndef MODULE |
| static void autorun_array(struct mddev *mddev) |
| { |
| struct md_rdev *rdev; |
| int err; |
| |
| if (list_empty(&mddev->disks)) |
| return; |
| |
| printk(KERN_INFO "md: running: "); |
| |
| rdev_for_each(rdev, mddev) { |
| char b[BDEVNAME_SIZE]; |
| printk("<%s>", bdevname(rdev->bdev,b)); |
| } |
| printk("\n"); |
| |
| err = do_md_run(mddev); |
| if (err) { |
| printk(KERN_WARNING "md: do_md_run() returned %d\n", err); |
| do_md_stop(mddev, 0, NULL); |
| } |
| } |
| |
| /* |
| * lets try to run arrays based on all disks that have arrived |
| * until now. (those are in pending_raid_disks) |
| * |
| * the method: pick the first pending disk, collect all disks with |
| * the same UUID, remove all from the pending list and put them into |
| * the 'same_array' list. Then order this list based on superblock |
| * update time (freshest comes first), kick out 'old' disks and |
| * compare superblocks. If everything's fine then run it. |
| * |
| * If "unit" is allocated, then bump its reference count |
| */ |
| static void autorun_devices(int part) |
| { |
| struct md_rdev *rdev0, *rdev, *tmp; |
| struct mddev *mddev; |
| char b[BDEVNAME_SIZE]; |
| |
| printk(KERN_INFO "md: autorun ...\n"); |
| while (!list_empty(&pending_raid_disks)) { |
| int unit; |
| dev_t dev; |
| LIST_HEAD(candidates); |
| rdev0 = list_entry(pending_raid_disks.next, |
| struct md_rdev, same_set); |
| |
| printk(KERN_INFO "md: considering %s ...\n", |
| bdevname(rdev0->bdev,b)); |
| INIT_LIST_HEAD(&candidates); |
| rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
| if (super_90_load(rdev, rdev0, 0) >= 0) { |
| printk(KERN_INFO "md: adding %s ...\n", |
| bdevname(rdev->bdev,b)); |
| list_move(&rdev->same_set, &candidates); |
| } |
| /* |
| * now we have a set of devices, with all of them having |
| * mostly sane superblocks. It's time to allocate the |
| * mddev. |
| */ |
| if (part) { |
| dev = MKDEV(mdp_major, |
| rdev0->preferred_minor << MdpMinorShift); |
| unit = MINOR(dev) >> MdpMinorShift; |
| } else { |
| dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); |
| unit = MINOR(dev); |
| } |
| if (rdev0->preferred_minor != unit) { |
| printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
| bdevname(rdev0->bdev, b), rdev0->preferred_minor); |
| break; |
| } |
| |
| md_probe(dev, NULL, NULL); |
| mddev = mddev_find(dev); |
| if (!mddev || !mddev->gendisk) { |
| if (mddev) |
| mddev_put(mddev); |
| printk(KERN_ERR |
| "md: cannot allocate memory for md drive.\n"); |
| break; |
| } |
| if (mddev_lock(mddev)) |
| printk(KERN_WARNING "md: %s locked, cannot run\n", |
| mdname(mddev)); |
| else if (mddev->raid_disks || mddev->major_version |
| || !list_empty(&mddev->disks)) { |
| printk(KERN_WARNING |
| "md: %s already running, cannot run %s\n", |
| mdname(mddev), bdevname(rdev0->bdev,b)); |
| mddev_unlock(mddev); |
| } else { |
| printk(KERN_INFO "md: created %s\n", mdname(mddev)); |
| 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); |
| } |
| autorun_array(mddev); |
| mddev_unlock(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); |
| } |
| mddev_put(mddev); |
| } |
| printk(KERN_INFO "md: ... autorun DONE.\n"); |
| } |
| #endif /* !MODULE */ |
| |
| static int get_version(void __user * arg) |
| { |
| mdu_version_t ver; |
| |
| ver.major = MD_MAJOR_VERSION; |
| ver.minor = MD_MINOR_VERSION; |
| ver.patchlevel = MD_PATCHLEVEL_VERSION; |
| |
| if (copy_to_user(arg, &ver, sizeof(ver))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int get_array_info(struct mddev * mddev, void __user * arg) |
| { |
| mdu_array_info_t info; |
| int nr,working,insync,failed,spare; |
| struct md_rdev *rdev; |
| |
| nr = working = insync = failed = spare = 0; |
| rcu_read_lock(); |
| rdev_for_each_rcu(rdev, mddev) { |
| nr++; |
| if (test_bit(Faulty, &rdev->flags)) |
| failed++; |
| else { |
| working++; |
| if (test_bit(In_sync, &rdev->flags)) |
| insync++; |
| else |
| spare++; |
| } |
| } |
| rcu_read_unlock(); |
| |
| info.major_version = mddev->major_version; |
| info.minor_version = mddev->minor_version; |
| info.patch_version = MD_PATCHLEVEL_VERSION; |
| info.ctime = mddev->ctime; |
| info.level = mddev->level; |
| info.size = mddev->dev_sectors / 2; |
| if (info.size != mddev->dev_sectors / 2) /* overflow */ |
| info.size = -1; |
| info.nr_disks = nr; |
| info.raid_disks = mddev->raid_disks; |
| info.md_minor = mddev->md_minor; |
| info.not_persistent= !mddev->persistent; |
| |
| info.utime = mddev->utime; |
| info.state = 0; |
| if (mddev->in_sync) |
| info.state = (1<<MD_SB_CLEAN); |
| if (mddev->bitmap && mddev->bitmap_info.offset) |
| info.state = (1<<MD_SB_BITMAP_PRESENT); |
| info.active_disks = insync; |
| info.working_disks = working; |
| info.failed_disks = failed; |
| info.spare_disks = spare; |
| |
| info.layout = mddev->layout; |
| info.chunk_size = mddev->chunk_sectors << 9; |
| |
| if (copy_to_user(arg, &info, sizeof(info))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int get_bitmap_file(struct mddev * mddev, void __user * arg) |
| { |
| mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ |
| char *ptr, *buf = NULL; |
| int err = -ENOMEM; |
| |
| file = kmalloc(sizeof(*file), GFP_NOIO); |
| |
| if (!file) |
| goto out; |
| |
| /* bitmap disabled, zero the first byte and copy out */ |
| if (!mddev->bitmap || !mddev->bitmap->storage.file) { |
| file->pathname[0] = '\0'; |
| goto copy_out; |
| } |
| |
| buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); |
| if (!buf) |
| goto out; |
| |
| ptr = d_path(&mddev->bitmap->storage.file->f_path, |
| buf, sizeof(file->pathname)); |
| if (IS_ERR(ptr)) |
| goto out; |
| |
| strcpy(file->pathname, ptr); |
| |
| copy_out: |
| err = 0; |
| if (copy_to_user(arg, file, sizeof(*file))) |
| err = -EFAULT; |
| out: |
| kfree(buf); |
| kfree(file); |
| return err; |
| } |
| |
| static int get_disk_info(struct mddev * mddev, void __user * arg) |
| { |
| mdu_disk_info_t info; |
| struct md_rdev *rdev; |
| |
| if (copy_from_user(&info, arg, sizeof(info))) |
| return -EFAULT; |
| |
| rcu_read_lock(); |
| rdev = find_rdev_nr_rcu(mddev, info.number); |
| if (rdev) { |
| info.major = MAJOR(rdev->bdev->bd_dev); |
| info.minor = MINOR(rdev->bdev->bd_dev); |
| info.raid_disk = rdev->raid_disk; |
| info.state = 0; |
| if (test_bit(Faulty, &rdev->flags)) |
| info.state |= (1<<MD_DISK_FAULTY); |
| else if (test_bit(In_sync, &rdev->flags)) { |
| info.state |= (1<<MD_DISK_ACTIVE); |
| info.state |= (1<<MD_DISK_SYNC); |
| } |
| if (test_bit(WriteMostly, &rdev->flags)) |
| info.state |= (1<<MD_DISK_WRITEMOSTLY); |
| } else { |
| info.major = info.minor = 0; |
| info.raid_disk = -1; |
| info.state = (1<<MD_DISK_REMOVED); |
| } |
| rcu_read_unlock(); |
| |
| if (copy_to_user(arg, &info, sizeof(info))) |
| return -EFAULT; |
| |
| return 0; |
| } |
| |
| static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info) |
| { |
| char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| struct md_rdev *rdev; |
| dev_t dev = MKDEV(info->major,info->minor); |
| |
| if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) |
| return -EOVERFLOW; |
| |
| if (!mddev->raid_disks) { |
| int err; |
| /* expecting a device which has a superblock */ |
| rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); |
| if (IS_ERR(rdev)) { |
| printk(KERN_WARNING |
| "md: md_import_device returned %ld\n", |
| PTR_ERR(rdev)); |
| return PTR_ERR(rdev); |
| } |
| if (!list_empty(&mddev->disks)) { |
| struct md_rdev *rdev0 |
| = list_entry(mddev->disks.next, |
| struct md_rdev, same_set); |
| err = super_types[mddev->major_version] |
| .load_super(rdev, rdev0, mddev->minor_version); |
| if (err < 0) { |
| printk(KERN_WARNING |
| "md: %s has different UUID to %s\n", |
| bdevname(rdev->bdev,b), |
| bdevname(rdev0->bdev,b2)); |
| export_rdev(rdev); |
| return -EINVAL; |
| } |
| } |
| err = bind_rdev_to_array(rdev, mddev); |
| if (err) |
| export_rdev(rdev); |
| return err; |
| } |
| |
| /* |
| * add_new_disk can be used once the array is assembled |
| * to add "hot spares". They must already have a superblock |
| * written |
| */ |
| if (mddev->pers) { |
| int err; |
| if (!mddev->pers->hot_add_disk) { |
| printk(KERN_WARNING |
| "%s: personality does not support diskops!\n", |
| mdname(mddev)); |
| return -EINVAL; |
| } |
| if (mddev->persistent) |
| rdev = md_import_device(dev, mddev->major_version, |
| mddev->minor_version); |
| else |
| rdev = md_import_device(dev, -1, -1); |
| if (IS_ERR(rdev)) { |
| printk(KERN_WARNING |
| "md: md_import_device returned %ld\n", |
| PTR_ERR(rdev)); |
| return PTR_ERR(rdev); |
| } |
| /* set saved_raid_disk if appropriate */ |
| if (!mddev->persistent) { |
| 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); |
| 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); |
| return -EINVAL; |
| } |
| |
| clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
| if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
| set_bit(WriteMostly, &rdev->flags); |
| else |
| clear_bit(WriteMostly, &rdev->flags); |
| |
| rdev->raid_disk = -1; |
| err = bind_rdev_to_array(rdev, mddev); |
| if (!err && !mddev->pers->hot_remove_disk) { |
| /* If there is hot_add_disk but no hot_remove_disk |
| * then added disks for geometry changes, |
| * and should be added immediately. |
| */ |
| super_types[mddev->major_version]. |
| validate_super(mddev, rdev); |
| err = mddev->pers->hot_add_disk(mddev, rdev); |
| if (err) |
| unbind_rdev_from_array(rdev); |
| } |
| if (err) |
| export_rdev(rdev); |
| else |
| sysfs_notify_dirent_safe(rdev->sysfs_state); |
| |
| set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| if (mddev->degraded) |
| set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| if (!err) |
| md_new_event(mddev); |
| md_wakeup_thread(mddev->thread); |
| return err; |
| } |
| |
| /* otherwise, add_new_disk is only allowed |
| * for major_version==0 superblocks |
| */ |
| if (mddev->major_version != 0) { |
| printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", |
| mdname(mddev)); |
| return -EINVAL; |
| } |
| |
| if (!(info->state & (1<<MD_DISK_FAULTY))) { |
| int err; |
| rdev = md_import_device(dev, -1, 0); |
| if (IS_ERR(rdev)) { |
| printk(KERN_WARNING |
| "md: error, md_import_device() returned %ld\n", |
| PTR_ERR(rdev)); |
| return PTR_ERR(rdev); |
| } |
| rdev->desc_nr = info->number; |
| if (info->raid_disk < mddev->raid_disks) |
| rdev->raid_disk = info->raid_disk; |
| else |
| rdev->raid_disk = -1; |
| |
| if (rdev->raid_disk < mddev->raid_disks) |
| if (info->state & (1<<MD_DISK_SYNC)) |
| set_bit(In_sync, &rdev->flags); |
| |
| if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
| set_bit(WriteMostly, &rdev->flags); |
| |
| if (!mddev->persistent) { |
| printk(KERN_INFO "md: nonpersistent superblock ...\n"); |
| rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
| } else |
| rdev->sb_start = calc_dev_sboffset(rdev); |
| rdev->sectors = rdev->sb_start; |
| |
| err = bind_rdev_to_array(rdev, mddev); |
| if (err) { |
| export_rdev(rdev); |
| return err; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int hot_remove_disk(struct mddev * mddev, dev_t dev) |
| { |
| char b[BDEVNAME_SIZE]; |
| struct md_rdev *rdev; |
| |
| rdev = find_rdev(mddev, dev); |
| if (!rdev) |
| return -ENXIO; |
| |
| clear_bit(Blocked, &rdev->flags); |
| remove_and_add_spares(mddev, rdev); |
| |
| if (rdev->raid_disk >= 0) |
| goto busy; |
| |
| kick_rdev_from_array(rdev); |
| md_update_sb(mddev, 1); |
| md_new_event(mddev); |
| |
| return 0; |
| busy: |
| printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
| bdevname(rdev->bdev,b), mdname(mddev)); |
| return -EBUSY; |
| } |
| |
| static int hot_add_disk(struct mddev * mddev, dev_t dev) |
| { |
| char b[BDEVNAME_SIZE]; |
| int err; |
| struct md_rdev *rdev; |
| |
| if (!mddev->pers) |
| return -ENODEV; |
| |
| if (mddev->major_version != 0) { |
| printk(KERN_WARNING "%s: HOT_ADD may only be used with" |
| " version-0 superblocks.\n", |
| mdname(mddev)); |
| return -EINVAL; |
| } |
| if (!mddev->pers->hot_add_disk) { |
| printk(KERN_WARNING |
| "%s: personality does not support diskops!\n", |
| mdname(mddev)); |
| return -EINVAL; |
| } |
| |
| rdev = md_import_device(dev, -1, 0); |
| if (IS_ERR(rdev)) { |
| printk(KERN_WARNING |
| "md: error, md_import_device() returned %ld\n", |
| PTR_ERR(rdev)); |
| return -EINVAL; |
| } |
| |
| if (mddev->persistent) |
| rdev->sb_start = calc_dev_sboffset(rdev); |
| else |
| rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
| |
| rdev->sectors = rdev->sb_start; |
| |
| if (test_bit(Faulty, &rdev->flags)) { |
| printk(KERN_WARNING |
| "md: can not hot-add faulty %s disk to %s!\n", |
| bdevname(rdev->bdev,b), mdname(mddev)); |
| err = -EINVAL; |
| goto abort_export; |
| } |
| clear_bit(In_sync, &rdev->flags); |
| rdev->desc_nr = -1; |
| rdev->saved_raid_disk = -1; |
| err = bind_rdev_to_array(rdev, mddev); |
| if (err) |
| goto abort_export; |
| |
| /* |
| * The rest should better be atomic, we can have disk failures |
| * noticed in interrupt contexts ... |
| */ |
| |
| rdev->raid_disk = -1; |
| |
| md_update_sb(mddev, 1); |
| |
| /* |
| * 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(mddev); |
| return 0; |
| |
| abort_export: |
| export_rdev(rdev); |
| return err; |
| } |
| |
| static int set_bitmap_file(struct mddev *mddev, int fd) |
| { |
| int err; |
| |
| if (mddev->pers) { |
| if (!mddev->pers->quiesce) |
| return -EBUSY; |
| if (mddev->recovery || mddev->sync_thread) |
| return -EBUSY; |
| /* we should be able to change the bitmap.. */ |
| } |
| |
| |
| if (fd >= 0) { |
| if (mddev->bitmap) |
| return -EEXIST; /* cannot add when bitmap is present */ |
| mddev->bitmap_info.file = fget(fd); |
| |
| if (mddev->bitmap_info.file == NULL) { |
| printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
| mdname(mddev)); |
| return -EBADF; |
| } |
| |
| err = deny_bitmap_write_access(mddev->bitmap_info.file); |
| if (err) { |
| printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
| mdname(mddev)); |
| fput(mddev->bitmap_info.file); |
| mddev->bitmap_info.file = NULL; |
| return err; |
| } |
| mddev->bitmap_info.offset = 0; /* file overrides offset */ |
| } else if (mddev->bitmap == NULL) |
| return -ENOENT; /* cannot remove what isn't there */ |
| err = 0; |
| if (mddev->pers) { |
| mddev->pers->quiesce(mddev, 1); |
| if (fd >= 0) { |
| err = bitmap_create(mddev); |
| if (!err) |
| err = bitmap_load(mddev); |
| } |
| if (fd < 0 || err) { |
| bitmap_destroy(mddev); |
| fd = -1; /* make sure to put the file */ |
| } |
| mddev->pers->quiesce(mddev, 0); |
| } |
| if (fd < 0) { |
| if (mddev->bitmap_info.file) { |
| restore_bitmap_write_access(mddev->bitmap_info.file); |
| fput(mddev->bitmap_info.file); |
| } |
| mddev->bitmap_info.file = NULL; |
| } |
| |
| return err; |
| } |
| |
| /* |
| * set_array_info is used two different ways |
| * The original usage is when creating a new array. |
| * In this usage, raid_disks is > 0 and it together with |
| * level, size, not_persistent,layout,chunksize determine the |
| * shape of the array. |
| * This will always create an array with a type-0.90.0 superblock. |
| * The newer usage is when assembling an array. |
| * In this case raid_disks will be 0, and the major_version field is |
| * use to determine which style super-blocks are to be found on the devices. |
| * The minor and patch _version numbers are also kept incase the |
| * super_block handler wishes to interpret them. |
| */ |
| static int set_array_info(struct mddev * mddev, mdu_array_info_t *info) |
| { |
| |
| if (info->raid_disks == 0) { |
| /* just setting version number for superblock loading */ |
| if (info->major_version < 0 || |
| info->major_version >= ARRAY_SIZE(super_types) || |
| super_types[info->major_version].name == NULL) { |
| /* maybe try to auto-load a module? */ |
| printk(KERN_INFO |
| "md: superblock version %d not known\n", |
| info->major_version); |
| return -EINVAL; |
| } |
| mddev->major_version = info->major_version; |
| mddev->minor_version = info->minor_version; |
| mddev->patch_version = info->patch_version; |
| mddev->persistent = !info->not_persistent; |
| /* ensure mddev_put doesn't delete this now that there |
| * is some minimal configuration. |
| */ |
| mddev->ctime = get_seconds(); |
| return 0; |
| } |
| mddev->major_version = MD_MAJOR_VERSION; |
| mddev->minor_version = MD_MINOR_VERSION; |
| mddev->patch_version = MD_PATCHLEVEL_VERSION; |
| mddev->ctime = get_seconds(); |
| |
| mddev->level = info->level; |
| mddev->clevel[0] = 0; |
| mddev->dev_sectors = 2 * (sector_t)info->size; |
| mddev->raid_disks = info->raid_disks; |
| /* don't set md_minor, it is determined by which /dev/md* was |
| * openned |
| */ |
| if (info->state & (1<<MD_SB_CLEAN)) |
| mddev->recovery_cp = MaxSector; |
| else |
| mddev->recovery_cp = 0; |
| mddev->persistent = ! info->not_persistent; |
| mddev->external = 0; |
| |
| mddev->layout = info->layout; |
| mddev->chunk_sectors = info->chunk_size >> 9; |
| |
| mddev->max_disks = MD_SB_DISKS; |
| |
| if (mddev->persistent) |
| mddev->flags = 0; |
| set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| |
| mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
| mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
| mddev->bitmap_info.offset = 0; |
| |
| mddev->reshape_position = MaxSector; |
| |
| /* |
| * Generate a 128 bit UUID |
| */ |
| get_random_bytes(mddev->uuid, 16); |
| |
| mddev->new_level = mddev->level; |
| mddev->new_chunk_sectors = mddev->chunk_sectors; |
| mddev->new_layout = mddev->layout; |
| mddev->delta_disks = 0; |
| mddev->reshape_backwards = 0; |
| |
| return 0; |
| } |
| |
| void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
| { |
| WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
| |
| if (mddev->external_size) |
| return; |
| |
| mddev->array_sectors = array_sectors; |
| } |
| EXPORT_SYMBOL(md_set_array_sectors); |
| |
| static int update_size(struct mddev *mddev, sector_t num_sectors) |
| { |
| struct md_rdev *rdev; |
| int rv; |
| int fit = (num_sectors == 0); |
| |
| if (mddev->pers->resize == NULL) |
| return -EINVAL; |
| /* The "num_sectors" is the number of sectors of each device that |
| * is used. This can only make sense for arrays with redundancy. |
| * linear and raid0 always use whatever space is available. We can only |
| * consider changing this number if no resync or reconstruction is |
| * happening, and if the new size is acceptable. It must fit before the |
| * sb_start or, if that is <data_offset, it must fit before the size |
| * of each device. If num_sectors is zero, we find the largest size |
| * that fits. |
| */ |
| if (mddev->sync_thread) |
| return -EBUSY; |
| |
| rdev_for_each(rdev, mddev) { |
| sector_t avail = rdev->sectors; |
| |
| if (fit && (num_sectors == 0 || num_sectors > avail)) |
| num_sectors = avail; |
| if (avail < num_sectors) |
| return -ENOSPC; |
| } |
| rv = mddev->pers->resize(mddev, num_sectors); |
| if (!rv) |
| revalidate_disk(mddev->gendisk); |
| return rv; |
| } |
| |
| static int update_raid_disks(struct mddev *mddev, int raid_disks) |
| { |
| int rv; |
| struct md_rdev *rdev; |
| /* change the number of raid disks */ |
| if (mddev->pers->check_reshape == NULL) |
| return -EINVAL; |
| if (raid_disks <= 0 || |
| (mddev->max_disks && raid_disks >= mddev->max_disks)) |
| return -EINVAL; |
| if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
| return -EBUSY; |
| |
| rdev_for_each(rdev, mddev) { |
| if (mddev->raid_disks < raid_disks && |
| rdev->data_offset < rdev->new_data_offset) |
| return -EINVAL; |
| if (mddev->raid_disks > raid_disks && |
| rdev->data_offset > rdev->new_data_offset) |
| return -EINVAL; |
| } |
| |
| mddev->delta_disks = raid_disks - mddev->raid_disks; |
| if (mddev->delta_disks < 0) |
| mddev->reshape_backwards = 1; |
| else if (mddev->delta_disks > 0) |
| mddev->reshape_backwards = 0; |
| |
| rv = mddev->pers->check_reshape(mddev); |
| if (rv < 0) { |
| mddev->delta_disks = 0; |
| mddev->reshape_backwards = 0; |
| } |
| return rv; |
| } |
| |
| |
| /* |
| * update_array_info is used to change the configuration of an |
| * on-line array. |
| * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size |
| * fields in the info are checked against the array. |
| * Any differences that cannot be handled will cause an error. |
| * Normally, only one change can be managed at a time. |
| */ |
| static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
| { |
| int rv = 0; |
| int cnt = 0; |
| int state = 0; |
| |
| /* calculate expected state,ignoring low bits */ |
| if (mddev->bitmap && mddev->bitmap_info.offset) |
| state |= (1 << MD_SB_BITMAP_PRESENT); |
| |
| if (mddev->major_version != info->major_version || |
| mddev->minor_version != info->minor_version || |
| /* mddev->patch_version != info->patch_version || */ |
| mddev->ctime != info->ctime || |
| mddev->level != info->level || |
| /* mddev->layout != info->layout || */ |
| !mddev->persistent != info->not_persistent|| |
| mddev->chunk_sectors != info->chunk_size >> 9 || |
| /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
| ((state^info->state) & 0xfffffe00) |
| ) |
| return -EINVAL; |
| /* Check there is only one change */ |
| if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
| cnt++; |
| if (mddev->raid_disks != info->raid_disks) |
| cnt++; |
| if (mddev->layout != info->layout) |
| cnt++; |
| if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) |
| cnt++; |
| if (cnt == 0) |
| return 0; |
| if (cnt > 1) |
| return -EINVAL; |
| |
| if (mddev->layout != info->layout) { |
| /* Change layout |
| * we don't need to do anything at the md level, the |
| * personality will take care of it all. |
| */ |
| if (mddev->pers->check_reshape == NULL) |
| return -EINVAL; |
| else { |
| mddev->new_layout = info->layout; |
| rv = mddev->pers->check_reshape(mddev); |
| if (rv) |
| mddev->new_layout = mddev->layout; |
| return rv; |
| } |
| } |
| if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
| rv = update_size(mddev, (sector_t)info->size * 2); |
| |
| if (mddev->raid_disks != info->raid_disks) |
| rv = update_raid_disks(mddev, info->raid_disks); |
| |
| if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
| if (mddev->pers->quiesce == NULL) |
| return -EINVAL; |
| if (mddev->recovery || mddev->sync_thread) |
| return -EBUSY; |
| if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { |
| /* add the bitmap */ |
| if (mddev->bitmap) |
| return -EEXIST; |
| if (mddev->bitmap_info.default_offset == 0) |
| return -EINVAL; |
| mddev->bitmap_info.offset = |
| mddev->bitmap_info.default_offset; |
| mddev->bitmap_info.space = |
| mddev->bitmap_info.default_space; |
| mddev->pers->quiesce(mddev, 1); |
| rv = bitmap_create(mddev); |
| if (!rv) |
| rv = bitmap_load(mddev); |
| if (rv) |
| bitmap_destroy(mddev); |
| mddev->pers->quiesce(mddev, 0); |
| } else { |
| /* remove the bitmap */ |
| if (!mddev->bitmap) |
| return -ENOENT; |
| if (mddev->bitmap->storage.file) |
| return -EINVAL; |
| mddev->pers->quiesce(mddev, 1); |
| bitmap_destroy(mddev); |
| mddev->pers->quiesce(mddev, 0); |
| mddev->bitmap_info.offset = 0; |
| } |
| } |
| md_update_sb(mddev, 1); |
| return rv; |
| } |
| |
| static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
| { |
| struct md_rdev *rdev; |
| int err = 0; |
| |
| if (mddev->pers == NULL) |
| return -ENODEV; |
| |
| rcu_read_lock(); |
| rdev = find_rdev_rcu(mddev, dev); |
| if (!rdev) |
| err = -ENODEV; |
| else { |
| md_error(mddev, rdev); |
| if (!test_bit(Faulty, &rdev->flags)) |
| err = -EBUSY; |
| } |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| /* |
| * We have a problem here : there is no easy way to give a CHS |
| * virtual geometry. We currently pretend that we have a 2 heads |
| * 4 sectors (with a BIG number of cylinders...). This drives |
| * dosfs just mad... ;-) |
| */ |
| static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| { |
| struct mddev *mddev = bdev->bd_disk->private_data; |
| |
| geo->heads = 2; |
| geo->sectors = 4; |
| geo->cylinders = mddev->array_sectors / 8; |
| return 0; |
| } |
| |
| static inline bool md_ioctl_valid(unsigned int cmd) |
| { |
| switch (cmd) { |
| case ADD_NEW_DISK: |
| case BLKROSET: |
| case GET_ARRAY_INFO: |
| case GET_BITMAP_FILE: |
| case GET_DISK_INFO: |
| case HOT_ADD_DISK: |
| case HOT_REMOVE_DISK: |
| case PRINT_RAID_DEBUG: |
| case RAID_AUTORUN: |
| case RAID_VERSION: |
| case RESTART_ARRAY_RW: |
| case RUN_ARRAY: |
| case SET_ARRAY_INFO: |
| case SET_BITMAP_FILE: |
| case SET_DISK_FAULTY: |
| case STOP_ARRAY: |
| case STOP_ARRAY_RO: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static int md_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| int err = 0; |
| void __user *argp = (void __user *)arg; |
| struct mddev *mddev = NULL; |
| int ro; |
| |
| 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; |
| } |
| |
| /* |
| * Commands dealing with the RAID driver but not any |
| * particular array: |
| */ |
| switch (cmd) { |
| case RAID_VERSION: |
| err = get_version(argp); |
| goto done; |
| |
| case PRINT_RAID_DEBUG: |
| err = 0; |
| md_print_devices(); |
| goto done; |
| |
| #ifndef MODULE |
| case RAID_AUTORUN: |
| err = 0; |
| autostart_arrays(arg); |
| goto done; |
| #endif |
| default:; |
| } |
| |
| /* |
| * Commands creating/starting a new array: |
| */ |
| |
| mddev = bdev->bd_disk->private_data; |
| |
| if (!mddev) { |
| BUG(); |
| goto abort; |
| } |
| |
| /* 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 abort; |
| |
| case GET_DISK_INFO: |
| if (!mddev->raid_disks && !mddev->external) |
| err = -ENODEV; |
| else |
| err = get_disk_info(mddev, argp); |
| goto abort; |
| |
| case SET_DISK_FAULTY: |
| err = set_disk_faulty(mddev, new_decode_dev(arg)); |
| goto abort; |
| } |
| |
| if (cmd == ADD_NEW_DISK) |
| /* need to ensure md_delayed_delete() has completed */ |
| flush_workqueue(md_misc_wq); |
| |
| 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->flags), |
| 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 (atomic_read(&mddev->openers) > 1) { |
| mutex_unlock(&mddev->open_mutex); |
| err = -EBUSY; |
| goto abort; |
| } |
| set_bit(MD_STILL_CLOSED, &mddev->flags); |
| mutex_unlock(&mddev->open_mutex); |
| sync_blockdev(bdev); |
| } |
| err = mddev_lock(mddev); |
| if (err) { |
| printk(KERN_INFO |
| "md: ioctl lock interrupted, reason %d, cmd %d\n", |
| err, cmd); |
| goto abort; |
| } |
| |
| if (cmd == SET_ARRAY_INFO) { |
| mdu_array_info_t info; |
| if (!arg) |
| memset(&info, 0, sizeof(info)); |
| else if (copy_from_user(&info, argp, sizeof(info))) { |
| err = -EFAULT; |
| goto abort_unlock; |
| } |
| if (mddev->pers) { |
| err = update_array_info(mddev, &info); |
| if (err) { |
| printk(KERN_WARNING "md: couldn't update" |
| " array info. %d\n", err); |
| goto abort_unlock; |
| } |
| goto done_unlock; |
| } |
| if (!list_empty(&mddev->disks)) { |
| printk(KERN_WARNING |
| "md: array %s already has disks!\n", |
| mdname(mddev)); |
| err = -EBUSY; |
| goto abort_unlock; |
| } |
| if (mddev->raid_disks) { |
| printk(KERN_WARNING |
| "md: array %s already initialised!\n", |
| mdname(mddev)); |
| err = -EBUSY; |
| goto abort_unlock; |
| } |
| err = set_array_info(mddev, &info); |
| if (err) { |
| printk(KERN_WARNING "md: couldn't set" |
| " array info. %d\n", err); |
| goto abort_unlock; |
| } |
| goto done_unlock; |
| } |
| |
| /* |
| * Commands querying/configuring an existing array: |
| */ |
| /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
| * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
| if ((!mddev->raid_disks && !mddev->external) |
| && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY |
| && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE |
| && cmd != GET_BITMAP_FILE) { |
| err = -ENODEV; |
| goto abort_unlock; |
| } |
| |
| /* |
| * Commands even a read-only array can execute: |
| */ |
| switch (cmd) { |
| case GET_BITMAP_FILE: |
| err = get_bitmap_file(mddev, argp); |
| goto done_unlock; |
| |
| case RESTART_ARRAY_RW: |
| err = restart_array(mddev); |
| goto done_unlock; |
| |
| case STOP_ARRAY: |
| err = do_md_stop(mddev, 0, bdev); |
| goto done_unlock; |
| |
| case STOP_ARRAY_RO: |
| err = md_set_readonly(mddev, bdev); |
| goto done_unlock; |
| |
| case HOT_REMOVE_DISK: |
| err = hot_remove_disk(mddev, new_decode_dev(arg)); |
| goto done_unlock; |
| |
| case ADD_NEW_DISK: |
| /* We can support ADD_NEW_DISK on read-only arrays |
| * on if we are re-adding a preexisting device. |
| * So require mddev->pers and MD_DISK_SYNC. |
| */ |
| if (mddev->pers) { |
| mdu_disk_info_t info; |
| if (copy_from_user(&info, argp, sizeof(info))) |
| err = -EFAULT; |
| else if (!(info.state & (1<<MD_DISK_SYNC))) |
| /* Need to clear read-only for this */ |
| break; |
| else |
| err = add_new_disk(mddev, &info); |
| goto done_unlock; |
| } |
| break; |
| |
| case BLKROSET: |
| if (get_user(ro, (int __user *)(arg))) { |
| err = -EFAULT; |
| goto done_unlock; |
| } |
| err = -EINVAL; |
| |
| /* if the bdev is going readonly the value of mddev->ro |
| * does not matter, no writes are coming |
| */ |
| if (ro) |
| goto done_unlock; |
| |
| /* are we are already prepared for writes? */ |
| if (mddev->ro != 1) |
| goto done_unlock; |
| |
| /* transitioning to readauto need only happen for |
| * arrays that call md_write_start |
| */ |
| if (mddev->pers) { |
| err = restart_array(mddev); |
| if (err == 0) { |
| mddev->ro = 2; |
| set_disk_ro(mddev->gendisk, 0); |
| } |
| } |
| goto done_unlock; |
| } |
| |
| /* |
| * The remaining ioctls are changing the state of the |
| * superblock, so we do not allow them on read-only arrays. |
| * However non-MD ioctls (e.g. get-size) will still come through |
| * here and hit the 'default' below, so only disallow |
| * 'md' ioctls, and switch to rw mode if started auto-readonly. |
| */ |
| if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
| if (mddev->ro == 2) { |
| mddev->ro = 0; |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| /* mddev_unlock will wake thread */ |
| /* If a device failed while we were read-only, we |
| * need to make sure the metadata is updated now. |
| */ |
| if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { |
| mddev_unlock(mddev); |
| wait_event(mddev->sb_wait, |
| !test_bit(MD_CHANGE_DEVS, &mddev->flags) && |
| !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
| mddev_lock_nointr(mddev); |
| } |
| } else { |
| err = -EROFS; |
| goto abort_unlock; |
| } |
| } |
| |
| switch (cmd) { |
| case ADD_NEW_DISK: |
| { |
| mdu_disk_info_t info; |
| if (copy_from_user(&info, argp, sizeof(info))) |
| err = -EFAULT; |
| else |
| err = add_new_disk(mddev, &info); |
| goto done_unlock; |
| } |
| |
| case HOT_ADD_DISK: |
| err = hot_add_disk(mddev, new_decode_dev(arg)); |
| goto done_unlock; |
| |
| case RUN_ARRAY: |
| err = do_md_run(mddev); |
| goto done_unlock; |
| |
| case SET_BITMAP_FILE: |
| err = set_bitmap_file(mddev, (int)arg); |
| goto done_unlock; |
| |
| default: |
| err = -EINVAL; |
| goto abort_unlock; |
| } |
| |
| done_unlock: |
| abort_unlock: |
| if (mddev->hold_active == UNTIL_IOCTL && |
| err != -EINVAL) |
| mddev->hold_active = 0; |
| mddev_unlock(mddev); |
| |
| return err; |
| done: |
| if (err) |
| MD_BUG(); |
| abort: |
| return err; |
| } |
| #ifdef CONFIG_COMPAT |
| static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| switch (cmd) { |
| case HOT_REMOVE_DISK: |
| case HOT_ADD_DISK: |
| case SET_DISK_FAULTY: |
| case SET_BITMAP_FILE: |
| /* These take in integer arg, do not convert */ |
| break; |
| default: |
| arg = (unsigned long)compat_ptr(arg); |
| break; |
| } |
| |
| return md_ioctl(bdev, mode, cmd, arg); |
| } |
| #endif /* CONFIG_COMPAT */ |
| |
| static int md_open(struct block_device *bdev, fmode_t mode) |
| { |
| /* |
| * Succeed if we can lock the mddev, which confirms that |
| * it isn't being stopped right now. |
| */ |
| struct mddev *mddev = mddev_find(bdev->bd_dev); |
| int err; |
| |
| if (!mddev) |
| return -ENODEV; |
| |
| if (mddev->gendisk != bdev->bd_disk) { |
| /* we are racing with mddev_put which is discarding this |
| * bd_disk. |
| */ |
| mddev_put(mddev); |
| /* Wait until bdev->bd_disk is definitely gone */ |
| flush_workqueue(md_misc_wq); |
| /* Then retry the open from the top */ |
| return -ERESTARTSYS; |
| } |
| BUG_ON(mddev != bdev->bd_disk->private_data); |
| |
| if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
| goto out; |
| |
| err = 0; |
| atomic_inc(&mddev->openers); |
| clear_bit(MD_STILL_CLOSED, &mddev->flags); |
| mutex_unlock(&mddev->open_mutex); |
| |
| check_disk_change(bdev); |
| out: |
| return err; |
| } |
| |
| static void md_release(struct gendisk *disk, fmode_t mode) |
| { |
| struct mddev *mddev = disk->private_data; |
| |
| BUG_ON(!mddev); |
| atomic_dec(&mddev->openers); |
| mddev_put(mddev); |
| } |
| |
| static int md_media_changed(struct gendisk *disk) |
| { |
| struct mddev *mddev = disk->private_data; |
| |
| return mddev->changed; |
| } |
| |
| static int md_revalidate(struct gendisk *disk) |
| { |
| struct mddev *mddev = disk->private_data; |
| |
| mddev->changed = 0; |
| return 0; |
| } |
| static const struct block_device_operations md_fops = |
| { |
| .owner = THIS_MODULE, |
| .open = md_open, |
| .release = md_release, |
| .ioctl = md_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = md_compat_ioctl, |
| #endif |
| .getgeo = md_getgeo, |
| .media_changed = md_media_changed, |
| .revalidate_disk= md_revalidate, |
| }; |
| |
| static int md_thread(void * arg) |
| { |
| struct md_thread *thread = arg; |
| |
| /* |
| * md_thread is a 'system-thread', it's priority should be very |
| * high. We avoid resource deadlocks individually in each |
| * raid personality. (RAID5 does preallocation) We also use RR and |
| * the very same RT priority as kswapd, thus we will never get |
| * into a priority inversion deadlock. |
| * |
| * we definitely have to have equal or higher priority than |
| * bdflush, otherwise bdflush will deadlock if there are too |
| * many dirty RAID5 blocks. |
| */ |
| |
| allow_signal(SIGKILL); |
| while (!kthread_should_stop()) { |
| |
| /* We need to wait INTERRUPTIBLE so that |
| * we don't add to the load-average. |
| * That means we need to be sure no signals are |
| * pending |
| */ |
| if (signal_pending(current)) |
| flush_signals(current); |
| |
| wait_event_interruptible_timeout |
| (thread->wqueue, |
| test_bit(THREAD_WAKEUP, &thread->flags) |
| || kthread_should_stop(), |
| thread->timeout); |
| |
| clear_bit(THREAD_WAKEUP, &thread->flags); |
| if (!kthread_should_stop()) |
| thread->run(thread); |
| } |
| |
| return 0; |
| } |
| |
| void md_wakeup_thread(struct md_thread *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 *md_register_thread(void (*run) (struct md_thread *), |
| struct mddev *mddev, const char *name) |
| { |
| struct md_thread *thread; |
| |
| thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
| if (!thread) |
| return NULL; |
| |
| init_waitqueue_head(&thread->wqueue); |
| |
| thread->run = run; |
| thread->mddev = mddev; |
| thread->timeout = MAX_SCHEDULE_TIMEOUT; |
| thread->tsk = kthread_run(md_thread, thread, |
| "%s_%s", |
| mdname(thread->mddev), |
| name); |
| if (IS_ERR(thread->tsk)) { |
| kfree(thread); |
| return NULL; |
| } |
| return thread; |
| } |
| |
| void md_unregister_thread(struct md_thread **threadp) |
| { |
| struct md_thread *thread = *threadp; |
| if (!thread) |
| return; |
| pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
| /* Locking ensures that mddev_unlock does not wake_up a |
| * non-existent thread |
| */ |
| spin_lock(&pers_lock); |
| *threadp = NULL; |
| spin_unlock(&pers_lock); |
| |
| kthread_stop(thread->tsk); |
| kfree(thread); |
| } |
| |
| void md_error(struct mddev *mddev, struct md_rdev *rdev) |
| { |
| if (!mddev) { |
| MD_BUG(); |
| return; |
| } |
| |
| if (!rdev || test_bit(Faulty, &rdev->flags)) |
| return; |
| |
| if (!mddev->pers || !mddev->pers->error_handler) |
| return; |
| mddev->pers->error_handler(mddev,rdev); |
| if (mddev->degraded) |
| set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| sysfs_notify_dirent_safe(rdev->sysfs_state); |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| if (mddev->event_work.func) |
| queue_work(md_misc_wq, &mddev->event_work); |
| md_new_event_inintr(mddev); |
| } |
| |
| /* seq_file implementation /proc/mdstat */ |
| |
| static void status_unused(struct seq_file *seq) |
| { |
| int i = 0; |
| struct md_rdev *rdev; |
| |
| seq_printf(seq, "unused devices: "); |
| |
| list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
| char b[BDEVNAME_SIZE]; |
| i++; |
| seq_printf(seq, "%s ", |
| bdevname(rdev->bdev,b)); |
| } |
| if (!i) |
| seq_printf(seq, "<none>"); |
| |
| seq_printf(seq, "\n"); |
| } |
| |
| |
| static void status_resync(struct seq_file *seq, struct mddev * mddev) |
| { |
| sector_t max_sectors, resync, res; |
| unsigned long dt, db; |
| sector_t rt; |
| int scale; |
| unsigned int per_milli; |
| |
| if (mddev->curr_resync <= 3) |
| resync = 0; |
| else |
| resync = mddev->curr_resync |
| - atomic_read(&mddev->recovery_active); |
| |
| if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
| test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| max_sectors = mddev->resync_max_sectors; |
| else |
| max_sectors = mddev->dev_sectors; |
| |
| /* |
| * Should not happen. |
| */ |
| if (!max_sectors) { |
| MD_BUG(); |
| return; |
| } |
| /* Pick 'scale' such that (resync>>scale)*1000 will fit |
| * in a sector_t, and (max_sectors>>scale) will fit in a |
| * u32, as those are the requirements for sector_div. |
| * Thus 'scale' must be at least 10 |
| */ |
| scale = 10; |
| if (sizeof(sector_t) > sizeof(unsigned long)) { |
| while ( max_sectors/2 > (1ULL<<(scale+32))) |
| scale++; |
| } |
| res = (resync>>scale)*1000; |
| sector_div(res, (u32)((max_sectors>>scale)+1)); |
| |
| per_milli = res; |
| { |
| int i, x = per_milli/50, y = 20-x; |
| seq_printf(seq, "["); |
| for (i = 0; i < x; i++) |
| seq_printf(seq, "="); |
| seq_printf(seq, ">"); |
| for (i = 0; i < y; i++) |
| seq_printf(seq, "."); |
| seq_printf(seq, "] "); |
| } |
| seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
| (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
| "reshape" : |
| (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
| "check" : |
| (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? |
| "resync" : "recovery"))), |
| per_milli/10, per_milli % 10, |
| (unsigned long long) resync/2, |
| (unsigned long long) max_sectors/2); |
| |
| /* |
| * dt: time from mark until now |
| * db: blocks written from mark until now |
| * rt: remaining time |
| * |
| * rt is a sector_t, so could be 32bit or 64bit. |
| * So we divide before multiply in case it is 32bit and close |
| * to the limit. |
| * We scale the divisor (db) by 32 to avoid losing precision |
| * near the end of resync when the number of remaining sectors |
| * is close to 'db'. |
| * We then divide rt by 32 after multiplying by db to compensate. |
| * The '+1' avoids division by zero if db is very small. |
| */ |
| dt = ((jiffies - mddev->resync_mark) / HZ); |
| if (!dt) dt++; |
| db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
| - mddev->resync_mark_cnt; |
| |
| rt = max_sectors - resync; /* number of remaining sectors */ |
| sector_div(rt, db/32+1); |
| rt *= dt; |
| rt >>= 5; |
| |
| seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, |
| ((unsigned long)rt % 60)/6); |
| |
| seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
| } |
| |
| static void *md_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| struct list_head *tmp; |
| loff_t l = *pos; |
| struct mddev *mddev; |
| |
| if (l >= 0x10000) |
| return NULL; |
| if (!l--) |
| /* header */ |
| return (void*)1; |
| |
| spin_lock(&all_mddevs_lock); |
| list_for_each(tmp,&all_mddevs) |
| if (!l--) { |
| mddev = list_entry(tmp, struct mddev, all_mddevs); |
| mddev_get(mddev); |
| spin_unlock(&all_mddevs_lock); |
| return mddev; |
| } |
| spin_unlock(&all_mddevs_lock); |
| if (!l--) |
| return (void*)2;/* tail */ |
| return NULL; |
| } |
| |
| static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct list_head *tmp; |
| struct mddev *next_mddev, *mddev = v; |
| |
| ++*pos; |
| if (v == (void*)2) |
| return NULL; |
| |
| spin_lock(&all_mddevs_lock); |
| if (v == (void*)1) |
| tmp = all_mddevs.next; |
| else |
| tmp = mddev->all_mddevs.next; |
| if (tmp != &all_mddevs) |
| next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
| else { |
| next_mddev = (void*)2; |
| *pos = 0x10000; |
| } |
| spin_unlock(&all_mddevs_lock); |
| |
| if (v != (void*)1) |
| mddev_put(mddev); |
| return next_mddev; |
| |
| } |
| |
| static void md_seq_stop(struct seq_file *seq, void *v) |
| { |
| struct mddev *mddev = v; |
| |
| if (mddev && v != (void*)1 && v != (void*)2) |
| mddev_put(mddev); |
| } |
| |
| static int md_seq_show(struct seq_file *seq, void *v) |
| { |
| struct mddev *mddev = v; |
| 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); |
| return 0; |
| } |
| if (v == (void*)2) { |
| status_unused(seq); |
| return 0; |
| } |
| |
| if (mddev_lock(mddev) < 0) |
| return -EINTR; |
| |
| if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
| seq_printf(seq, "%s : %sactive", mdname(mddev), |
| mddev->pers ? "" : "in"); |
| if (mddev->pers) { |
| if (mddev->ro==1) |
| seq_printf(seq, " (read-only)"); |
| if (mddev->ro==2) |
| seq_printf(seq, " (auto-read-only)"); |
| seq_printf(seq, " %s", mddev->pers->name); |
| } |
| |
| sectors = 0; |
| rdev_for_each(rdev, mddev) { |
| char b[BDEVNAME_SIZE]; |
| seq_printf(seq, " %s[%d]", |
| bdevname(rdev->bdev,b), rdev->desc_nr); |
| if (test_bit(WriteMostly, &rdev->flags)) |
| seq_printf(seq, "(W)"); |
| if (test_bit(Faulty, &rdev->flags)) { |
| seq_printf(seq, "(F)"); |
| continue; |
| } |
| if (rdev->raid_disk < 0) |
| seq_printf(seq, "(S)"); /* spare */ |
| if (test_bit(Replacement, &rdev->flags)) |
| seq_printf(seq, "(R)"); |
| sectors += rdev->sectors; |
| } |
| |
| if (!list_empty(&mddev->disks)) { |
| if (mddev->pers) |
| seq_printf(seq, "\n %llu blocks", |
| (unsigned long long) |
| mddev->array_sectors / 2); |
| else |
| seq_printf(seq, "\n %llu blocks", |
| (unsigned long long)sectors / 2); |
| } |
| if (mddev->persistent) { |
| if (mddev->major_version != 0 || |
| mddev->minor_version != 90) { |
| seq_printf(seq," super %d.%d", |
| mddev->major_version, |
| mddev->minor_version); |
| } |
| } else if (mddev->external) |
| seq_printf(seq, " super external:%s", |
| mddev->metadata_type); |
| else |
| seq_printf(seq, " super non-persistent"); |
| |
| if (mddev->pers) { |
| mddev->pers->status(seq, mddev); |
| seq_printf(seq, "\n "); |
| if (mddev->pers->sync_request) { |
| if (mddev->curr_resync > 2) { |
| status_resync(seq, mddev); |
| seq_printf(seq, "\n "); |
| } else if (mddev->curr_resync >= 1) |
| seq_printf(seq, "\tresync=DELAYED\n "); |
| else if (mddev->recovery_cp < MaxSector) |
| seq_printf(seq, "\tresync=PENDING\n "); |
| } |
| } else |
| seq_printf(seq, "\n "); |
| |
| bitmap_status(seq, mddev->bitmap); |
| |
| seq_printf(seq, "\n"); |
| } |
| mddev_unlock(mddev); |
| |
| return 0; |
| } |
| |
| static const struct seq_operations md_seq_ops = { |
| .start = md_seq_start, |
| .next = md_seq_next, |
| .stop = md_seq_stop, |
| .show = md_seq_show, |
| }; |
| |
| static int md_seq_open(struct inode *inode, struct file *file) |
| { |
| struct seq_file *seq; |
| int error; |
| |
| error = seq_open(file, &md_seq_ops); |
| if (error) |
| return error; |
| |
| seq = file->private_data; |
| seq->poll_event = atomic_read(&md_event_count); |
| return error; |
| } |
| |
| static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
| { |
| struct seq_file *seq = filp->private_data; |
| int mask; |
| |
| poll_wait(filp, &md_event_waiters, wait); |
| |
| /* always allow read */ |
| mask = POLLIN | POLLRDNORM; |
| |
| if (seq->poll_event != atomic_read(&md_event_count)) |
| mask |= POLLERR | POLLPRI; |
| return mask; |
| } |
| |
| static const struct file_operations md_seq_fops = { |
| .owner = THIS_MODULE, |
| .open = md_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_private, |
| .poll = mdstat_poll, |
| }; |
| |
| int register_md_personality(struct md_personality *p) |
| { |
| spin_lock(&pers_lock); |
| list_add_tail(&p->list, &pers_list); |
| printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); |
| spin_unlock(&pers_lock); |
| return 0; |
| } |
| |
| int unregister_md_personality(struct md_personality *p) |
| { |
| printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
| spin_lock(&pers_lock); |
| list_del_init(&p->list); |
| spin_unlock(&pers_lock); |
| return 0; |
| } |
| |
| static int is_mddev_idle(struct mddev *mddev, int init) |
| { |
| struct md_rdev * rdev; |
| int idle; |
| int curr_events; |
| |
| idle = 1; |
| rcu_read_lock(); |
| rdev_for_each_rcu(rdev, mddev) { |
| struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
| curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
| (int)part_stat_read(&disk->part0, sectors[1]) - |
| 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; |
| } |
| } |
| rcu_read_unlock(); |
| return idle; |
| } |
| |
| void md_done_sync(struct mddev *mddev, int blocks, int ok) |
| { |
| /* another "blocks" (512byte) blocks have been synced */ |
| atomic_sub(blocks, &mddev->recovery_active); |
| wake_up(&mddev->recovery_wait); |
| if (!ok) { |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| // stop recovery, signal do_sync .... |
| } |
| } |
| |
| |
| /* md_write_start(mddev, bi) |
| * If we need to update some array metadata (e.g. 'active' flag |
| * in superblock) before writing, schedule a superblock update |
| * and wait for it to complete. |
| */ |
| void md_write_start(struct mddev *mddev, struct bio *bi) |
| { |
| int did_change = 0; |
| if (bio_data_dir(bi) != WRITE) |
| return; |
| |
| BUG_ON(mddev->ro == 1); |
| if (mddev->ro == 2) { |
| /* need to switch to read/write */ |
| mddev->ro = 0; |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| md_wakeup_thread(mddev->sync_thread); |
| did_change = 1; |
| } |
| atomic_inc(&mddev->writes_pending); |
| if (mddev->safemode == 1) |
| mddev->safemode = 0; |
| if (mddev->in_sync) { |
| spin_lock_irq(&mddev->write_lock); |
| if (mddev->in_sync) { |
| mddev->in_sync = 0; |
| set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| set_bit(MD_CHANGE_PENDING, &mddev->flags); |
| md_wakeup_thread(mddev->thread); |
| did_change = 1; |
| } |
| spin_unlock_irq(&mddev->write_lock); |
| } |
| if (did_change) |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| wait_event(mddev->sb_wait, |
| !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
| } |
| |
| void md_write_end(struct mddev *mddev) |
| { |
| if (atomic_dec_and_test(&mddev->writes_pending)) { |
| if (mddev->safemode == 2) |
| md_wakeup_thread(mddev->thread); |
| else if (mddev->safemode_delay) |
| mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
| } |
| } |
| |
| /* 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 |
| * attempting a GFP_KERNEL allocation while holding the mddev lock. |
| * Must be called with mddev_lock held. |
| * |
| * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock |
| * is dropped, so return -EAGAIN after notifying userspace. |
| */ |
| int md_allow_write(struct mddev *mddev) |
| { |
| if (!mddev->pers) |
| return 0; |
| if (mddev->ro) |
| return 0; |
| if (!mddev->pers->sync_request) |
| return 0; |
| |
| spin_lock_irq(&mddev->write_lock); |
| if (mddev->in_sync) { |
| mddev->in_sync = 0; |
| set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| set_bit(MD_CHANGE_PENDING, &mddev->flags); |
| if (mddev->safemode_delay && |
| mddev->safemode == 0) |
| mddev->safemode = 1; |
| spin_unlock_irq(&mddev->write_lock); |
| md_update_sb(mddev, 0); |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| } else |
| spin_unlock_irq(&mddev->write_lock); |
| |
| if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
| return -EAGAIN; |
| else |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(md_allow_write); |
| |
| #define SYNC_MARKS 10 |
| #define SYNC_MARK_STEP (3*HZ) |
| #define UPDATE_FREQUENCY (5*60*HZ) |
| void md_do_sync(struct md_thread *thread) |
| { |
| struct mddev *mddev = thread->mddev; |
| struct mddev *mddev2; |
| unsigned int currspeed = 0, |
| window; |
| sector_t max_sectors,j, io_sectors; |
| unsigned long mark[SYNC_MARKS]; |
| unsigned long update_time; |
| sector_t mark_cnt[SYNC_MARKS]; |
| int last_mark,m; |
| struct list_head *tmp; |
| sector_t last_check; |
| int skipped = 0; |
| struct md_rdev *rdev; |
| char *desc, *action = NULL; |
| struct blk_plug plug; |
| |
| /* just incase thread restarts... */ |
| if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) |
| return; |
| if (mddev->ro) {/* never try to sync a read-only array */ |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| return; |
| } |
| |
| 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"; |
| |
| mddev->last_sync_action = action ?: desc; |
| |
| /* we overload curr_resync somewhat here. |
| * 0 == not engaged in resync at all |
| * 2 == checking that there is no conflict with another sync |
| * 1 == like 2, but have yielded to allow conflicting resync to |
| * commense |
| * other == active in resync - this many blocks |
| * |
| * Before starting a resync we must have set curr_resync to |
| * 2, and then checked that every "conflicting" array has curr_resync |
| * less than ours. When we find one that is the same or higher |
| * we wait on resync_wait. To avoid deadlock, we reduce curr_resync |
| * to 1 if we choose to yield (based arbitrarily on address of mddev structure). |
| * This will mean we have to start checking from the beginning again. |
| * |
| */ |
| |
| do { |
| mddev->curr_resync = 2; |
| |
| try_again: |
| if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| goto skip; |
| for_each_mddev(mddev2, tmp) { |
| if (mddev2 == mddev) |
| continue; |
| if (!mddev->parallel_resync |
| && mddev2->curr_resync |
| && match_mddev_units(mddev, mddev2)) { |
| DEFINE_WAIT(wq); |
| if (mddev < mddev2 && mddev->curr_resync == 2) { |
| /* arbitrarily yield */ |
| mddev->curr_resync = 1; |
| wake_up(&resync_wait); |
| } |
| if (mddev > mddev2 && mddev->curr_resync == 1) |
| /* no need to wait here, we can wait the next |
| * time 'round when curr_resync == 2 |
| */ |
| continue; |
| /* We need to wait 'interruptible' so as not to |
| * contribute to the load average, and not to |
| * be caught by 'softlockup' |
| */ |
| prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); |
| if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
| mddev2->curr_resync >= mddev->curr_resync) { |
| printk(KERN_INFO "md: delaying %s of %s" |
| " until %s has finished (they" |
| " share one or more physical units)\n", |
| desc, mdname(mddev), mdname(mddev2)); |
| mddev_put(mddev2); |
| if (signal_pending(current)) |
| flush_signals(current); |
| schedule(); |
| finish_wait(&resync_wait, &wq); |
| goto try_again; |
| } |
| finish_wait(&resync_wait, &wq); |
| } |
| } |
| } while (mddev->curr_resync < 2); |
| |
| 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; |
| 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(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); |
| } |
| } |
| |
| printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
| printk(KERN_INFO "md: minimum _guaranteed_ speed:" |
| " %d KB/sec/disk.\n", speed_min(mddev)); |
| printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
| "(but not more than %d KB/sec) for %s.\n", |
| speed_max(mddev), desc); |
| |
| is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
| |
| io_sectors = 0; |
| for (m = 0; m < SYNC_MARKS; m++) { |
| mark[m] = jiffies; |
| mark_cnt[m] = io_sectors; |
| } |
| last_mark = 0; |
| mddev->resync_mark = mark[last_mark]; |
| mddev->resync_mark_cnt = mark_cnt[last_mark]; |
| |
| /* |
| * Tune reconstruction: |
| */ |
| window = 32*(PAGE_SIZE/512); |
| printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
| window/2, (unsigned long long)max_sectors/2); |
| |
| atomic_set(&mddev->recovery_active, 0); |
| last_check = 0; |
| |
| if (j>2) { |
| printk(KERN_INFO |
| "md: resuming %s of %s from checkpoint.\n", |
| desc, mdname(mddev)); |
| mddev->curr_resync = j; |
| } else |
| mddev->curr_resync = 3; /* no longer delayed */ |
| mddev->curr_resync_completed = j; |
| sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| md_new_event(mddev); |
| update_time = jiffies; |
| |
| blk_start_plug(&plug); |
| while (j < max_sectors) { |
| sector_t sectors; |
| |
| skipped = 0; |
| |
| if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| ((mddev->curr_resync > mddev->curr_resync_completed && |
| (mddev->curr_resync - mddev->curr_resync_completed) |
| > (max_sectors >> 4)) || |
| time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
| (j - mddev->curr_resync_completed)*2 |
| >= mddev->resync_max - mddev->curr_resync_completed |
| )) { |
| /* time to update curr_resync_completed */ |
| wait_event(mddev->recovery_wait, |
| 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; |
| update_time = jiffies; |
| set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| } |
| |
| while (j >= mddev->resync_max && |
| !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
| /* As this condition is controlled by user-space, |
| * we can block indefinitely, so use '_interruptible' |
| * to avoid triggering warnings. |
| */ |
| flush_signals(current); /* just in case */ |
| wait_event_interruptible(mddev->recovery_wait, |
| mddev->resync_max > j |
| || test_bit(MD_RECOVERY_INTR, |
| &mddev->recovery)); |
| } |
| |
| if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| break; |
| |
| sectors = mddev->pers->sync_request(mddev, j, &skipped, |
| currspeed < speed_min(mddev)); |
| if (sectors == 0) { |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| break; |
| } |
| |
| if (!skipped) { /* actual IO requested */ |
| io_sectors += sectors; |
| atomic_add(sectors, &mddev->recovery_active); |
| } |
| |
| if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| break; |
| |
| j += sectors; |
| if (j > 2) |
| mddev->curr_resync = j; |
| mddev->curr_mark_cnt = io_sectors; |
| if (last_check == 0) |
| /* this is the earliest that rebuild will be |
| * visible in /proc/mdstat |
| */ |
| md_new_event(mddev); |
| |
| if (last_check + window > io_sectors || j == max_sectors) |
| continue; |
| |
| last_check = io_sectors; |
| repeat: |
| if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { |
| /* step marks */ |
| int next = (last_mark+1) % SYNC_MARKS; |
| |
| mddev->resync_mark = mark[next]; |
| mddev->resync_mark_cnt = mark_cnt[next]; |
| mark[next] = jiffies; |
| mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
| last_mark = next; |
| } |
| |
| if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| break; |
| |
| /* |
| * this loop exits only if either when we are slower than |
| * the 'hard' speed limit, or the system was IO-idle for |
| * a jiffy. |
| * the system might be non-idle CPU-wise, but we only care |
| * about not overloading the IO subsystem. (things like an |
| * e2fsck being done on the RAID array should execute fast) |
| */ |
| cond_resched(); |
| |
| currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
| /((jiffies-mddev->resync_mark)/HZ +1) +1; |
| |
| if (currspeed > speed_min(mddev)) { |
| if ((currspeed > speed_max(mddev)) || |
| !is_mddev_idle(mddev, 0)) { |
| msleep(500); |
| goto repeat; |
| } |
| } |
| } |
| printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
| test_bit(MD_RECOVERY_INTR, &mddev->recovery) |
| ? "interrupted" : "done"); |
| /* |
| * this also signals 'finished resyncing' to md_stop |
| */ |
| blk_finish_plug(&plug); |
| wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
| |
| /* tell personality that we are finished */ |
| mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
| |
| if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
| mddev->curr_resync > 2) { |
| if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
| if (mddev->curr_resync >= mddev->recovery_cp) { |
| printk(KERN_INFO |
| "md: checkpointing %s of %s.\n", |
| desc, mdname(mddev)); |
| if (test_bit(MD_RECOVERY_ERROR, |
| &mddev->recovery)) |
| mddev->recovery_cp = |
| mddev->curr_resync_completed; |
| else |
| mddev->recovery_cp = |
| mddev->curr_resync; |
| } |
| } else |
| mddev->recovery_cp = MaxSector; |
| } else { |
| if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| mddev->curr_resync = MaxSector; |
| rcu_read_lock(); |
| rdev_for_each_rcu(rdev, mddev) |
| if (rdev->raid_disk >= 0 && |
| mddev->delta_disks >= 0 && |
| !test_bit(Faulty, &rdev->flags) && |
| !test_bit(In_sync, &rdev->flags) && |
| rdev->recovery_offset < mddev->curr_resync) |
| rdev->recovery_offset = mddev->curr_resync; |
| rcu_read_unlock(); |
| } |
| } |
| skip: |
| set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| |
| if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
| /* We completed so min/max setting can be forgotten if used. */ |
| if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| mddev->resync_min = 0; |
| mddev->resync_max = MaxSector; |
| } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| mddev->resync_min = mddev->curr_resync_completed; |
| mddev->curr_resync = 0; |
| wake_up(&resync_wait); |
| set_bit(MD_RECOVERY_DONE, &mddev->recovery); |
| md_wakeup_thread(mddev->thread); |
| return; |
| } |
| EXPORT_SYMBOL_GPL(md_do_sync); |
| |
| static int remove_and_add_spares(struct mddev *mddev, |
| struct md_rdev *this) |
| { |
| struct md_rdev *rdev; |
| int spares = 0; |
| int removed = 0; |
| |
| rdev_for_each(rdev, mddev) |
| if ((this == NULL || rdev == this) && |
| rdev->raid_disk >= 0 && |
| !test_bit(Blocked, &rdev->flags) && |
| (test_bit(Faulty, &rdev->flags) || |
| ! test_bit(In_sync, &rdev->flags)) && |
| atomic_read(&rdev->nr_pending)==0) { |
| if (mddev->pers->hot_remove_disk( |
| mddev, rdev) == 0) { |
| sysfs_unlink_rdev(mddev, rdev); |
| rdev->raid_disk = -1; |
| removed++; |
| } |
| } |
| if (removed && mddev->kobj.sd) |
| sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| |
| if (this) |
| goto no_add; |
| |
| rdev_for_each(rdev, mddev) { |
| if (rdev->raid_disk >= 0 && |
| !test_bit(In_sync, &rdev->flags) && |
| !test_bit(Faulty, &rdev->flags)) |
| spares++; |
| if (rdev->raid_disk >= 0) |
| continue; |
| if (test_bit(Faulty, &rdev->flags)) |
| continue; |
| if (mddev->ro && |
| ! (rdev->saved_raid_disk >= 0 && |
| !test_bit(Bitmap_sync, &rdev->flags))) |
| continue; |
| |
| if (rdev->saved_raid_disk < 0) |
| rdev->recovery_offset = 0; |
| if (mddev->pers-> |
| hot_add_disk(mddev, rdev) == 0) { |
| if (sysfs_link_rdev(mddev, rdev)) |
| /* failure here is OK */; |
| spares++; |
| md_new_event(mddev); |
| set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| } |
| } |
| no_add: |
| if (removed) |
| set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| return spares; |
| } |
| |
| /* |
| * This routine is regularly called by all per-raid-array threads to |
| * deal with generic issues like resync and super-block update. |
| * Raid personalities that don't have a thread (linear/raid0) do not |
| * need this as they never do any recovery or update the superblock. |
| * |
| * It does not do any resync itself, but rather "forks" off other threads |
| * to do that as needed. |
| * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in |
| * "->recovery" and create a thread at ->sync_thread. |
| * When the thread finishes it sets MD_RECOVERY_DONE |
| * and wakeups up this thread which will reap the thread and finish up. |
| * This thread also removes any faulty devices (with nr_pending == 0). |
| * |
| * The overall approach is: |
| * 1/ if the superblock needs updating, update it. |
| * 2/ If a recovery thread is running, don't do anything else. |
| * 3/ If recovery has finished, clean up, possibly marking spares active. |
| * 4/ If there are any faulty devices, remove them. |
| * 5/ If array is degraded, try to add spares devices |
| * 6/ If array has spares or is not in-sync, start a resync thread. |
| */ |
| void md_check_recovery(struct mddev *mddev) |
| { |
| if (mddev->suspended) |
| return; |
| |
| if (mddev->bitmap) |
| bitmap_daemon_work(mddev); |
| |
| if (signal_pending(current)) { |
| if (mddev->pers->sync_request && !mddev->external) { |
| printk(KERN_INFO "md: %s in immediate safe mode\n", |
| mdname(mddev)); |
| mddev->safemode = 2; |
| } |
| flush_signals(current); |
| } |
| |
| if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
| return; |
| if ( ! ( |
| (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_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 && ! atomic_read(&mddev->writes_pending) |
| && !mddev->in_sync && mddev->recovery_cp == MaxSector) |
| )) |
| return; |
| |
| if (mddev_trylock(mddev)) { |
| int spares = 0; |
| |
| if (mddev->ro) { |
| /* 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 |
| * ->spare_active and clear saved_raid_disk |
| */ |
| set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| md_reap_sync_thread(mddev); |
| clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| goto unlock; |
| } |
| |
| if (!mddev->external) { |
| int did_change = 0; |
| spin_lock_irq(&mddev->write_lock); |
| if (mddev->safemode && |
| !atomic_read(&mddev->writes_pending) && |
| !mddev->in_sync && |
| mddev->recovery_cp == MaxSector) { |
| mddev->in_sync = 1; |
| did_change = 1; |
| set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| } |
| if (mddev->safemode == 1) |
| mddev->safemode = 0; |
| spin_unlock_irq(&mddev->write_lock); |
| if (did_change) |
| sysfs_notify_dirent_safe(mddev->sysfs_state); |
| } |
| |
| if (mddev->flags & MD_UPDATE_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_reap_sync_thread(mddev); |
| goto unlock; |
| } |
| /* Set RUNNING before clearing NEEDED to avoid |
| * any transients in the value of "sync_action". |
| */ |
| mddev->curr_resync_completed = 0; |
| set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| /* Clear some bits that don't mean anything, but |
| * might be left set |
| */ |
| 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 unlock; |
| /* 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 unlock; |
| 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 unlock; |
| |
| 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 |
| */ |
| bitmap_write_all(mddev->bitmap); |
| } |
| mddev->sync_thread = md_register_thread(md_do_sync, |
| mddev, |
| "resync"); |
| if (!mddev->sync_thread) { |
| printk(KERN_ERR "%s: could not start resync" |
| " thread...\n", |
| mdname(mddev)); |
| /* leave the spares where they are, it shouldn't hurt */ |
| clear_bit(MD_RECOVERY_RUNNING, &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); |
| } else |
| md_wakeup_thread(mddev->sync_thread); |
| sysfs_notify_dirent_safe(mddev->sysfs_action); |
| md_new_event(mddev); |
| } |
| unlock: |
| wake_up(&mddev->sb_wait); |
| |
| if (!mddev->sync_thread) { |
| clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
| &mddev->recovery)) |
| if (mddev->sysfs_action) |
| sysfs_notify_dirent_safe(mddev->sysfs_action); |
| } |
| mddev_unlock(mddev); |
| } |
| } |
| |
| void md_reap_sync_thread(struct mddev *mddev) |
| { |
| struct md_rdev *rdev; |
| |
| /* resync has finished, collect result */ |
| md_unregister_thread(&mddev->sync_thread); |
| wake_up(&resync_wait); |
| if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
| !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
| /* success...*/ |
| /* activate any spares */ |
| if (mddev->pers->spare_active(mddev)) { |
| sysfs_notify(&mddev->kobj, NULL, |
| "degraded"); |
| set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| } |
| } |
| if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
| mddev->pers->finish_reshape) |
| mddev->pers->finish_reshape(mddev); |
| |
| /* If array is no-longer degraded, then any saved_raid_disk |
| * information must be scrapped. |
| */ |
| if (!mddev->degraded) |
| rdev_for_each(rdev, mddev) |
| rdev->saved_raid_disk = -1; |
| |
| md_update_sb(mddev, 1); |
| clear_bit(MD_RECOVERY_RUNNING, &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); |
| /* flag recovery needed just to double check */ |
| set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| sysfs_notify_dirent_safe(mddev->sysfs_action); |
| md_new_event(mddev); |
| if (mddev->event_work.func) |
| queue_work(md_misc_wq, &mddev->event_work); |
| } |
| |
| 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), |
| msecs_to_jiffies(5000)); |
| rdev_dec_pending(rdev, mddev); |
| } |
| EXPORT_SYMBOL(md_wait_for_blocked_rdev); |
| |
| void md_finish_reshape(struct mddev *mddev) |
| { |
| /* called be personality module when reshape completes. */ |
| struct md_rdev *rdev; |
| |
| rdev_for_each(rdev, mddev) { |
| if (rdev->data_offset > rdev->new_data_offset) |
| rdev->sectors += rdev->data_offset - rdev->new_data_offset; |
| else |
| rdev->sectors -= rdev->new_data_offset - rdev->data_offset; |
| rdev->data_offset = rdev->new_data_offset; |
| } |
| } |
| EXPORT_SYMBOL(md_finish_reshape); |
| |
| /* Bad block management. |
| * We can record which blocks on each device are 'bad' and so just |
| * fail those blocks, or that stripe, rather than the whole device. |
| * Entries in the bad-block table are 64bits wide. This comprises: |
| * Length of bad-range, in sectors: 0-511 for lengths 1-512 |
| * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) |
| * A 'shift' can be set so that larger blocks are tracked and |
| * consequently larger devices can be covered. |
| * 'Acknowledged' flag - 1 bit. - the most significant bit. |
| * |
| * Locking of the bad-block table uses a seqlock so md_is_badblock |
| * might need to retry if it is very unlucky. |
| * We will sometimes want to check for bad blocks in a bi_end_io function, |
| * so we use the write_seqlock_irq variant. |
| * |
| * When looking for a bad block we specify a range and want to |
| * know if any block in the range is bad. So we binary-search |
| * to the last range that starts at-or-before the given endpoint, |
| * (or "before the sector after the target range") |
| * then see if it ends after the given start. |
| * We return |
| * 0 if there are no known bad blocks in the range |
| * 1 if there are known bad block which are all acknowledged |
| * -1 if there are bad blocks which have not yet been acknowledged in metadata. |
| * plus the start/length of the first bad section we overlap. |
| */ |
| int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, |
| sector_t *first_bad, int *bad_sectors) |
| { |
| int hi; |
| int lo; |
| u64 *p = bb->page; |
| int rv; |
| sector_t target = s + sectors; |
| unsigned seq; |
| |
| if (bb->shift > 0) { |
| /* round the start down, and the end up */ |
| s >>= bb->shift; |
| target += (1<<bb->shift) - 1; |
| target >>= bb->shift; |
| sectors = target - s; |
| } |
| /* 'target' is now the first block after the bad range */ |
| |
| retry: |
| seq = read_seqbegin(&bb->lock); |
| lo = 0; |
| rv = 0; |
| hi = bb->count; |
| |
| /* Binary search between lo and hi for 'target' |
| * i.e. for the last range that starts before 'target' |
| */ |
| /* INVARIANT: ranges before 'lo' and at-or-after 'hi' |
| * are known not to be the last range before target. |
| * VARIANT: hi-lo is the number of possible |
| * ranges, and decreases until it reaches 1 |
| */ |
| while (hi - lo > 1) { |
| int mid = (lo + hi) / 2; |
| sector_t a = BB_OFFSET(p[mid]); |
| if (a < target) |
| /* This could still be the one, earlier ranges |
| * could not. */ |
| lo = mid; |
| else |
| /* This and later ranges are definitely out. */ |
| hi = mid; |
| } |
| /* 'lo' might be the last that started before target, but 'hi' isn't */ |
| if (hi > lo) { |
| /* need to check all range that end after 's' to see if |
| * any are unacknowledged. |
| */ |
| while (lo >= 0 && |
| BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { |
| if (BB_OFFSET(p[lo]) < target) { |
| /* starts before the end, and finishes after |
| * the start, so they must overlap |
| */ |
| if (rv != -1 && BB_ACK(p[lo])) |
| rv = 1; |
| else |
| rv = -1; |
| *first_bad = BB_OFFSET(p[lo]); |
| *bad_sectors = BB_LEN(p[lo]); |
| } |
| lo--; |
| } |
| } |
| |
| if (read_seqretry(&bb->lock, seq)) |
| goto retry; |
| |
| return rv; |
| } |
| EXPORT_SYMBOL_GPL(md_is_badblock); |
| |
| /* |
| * Add a range of bad blocks to the table. |
| * This might extend the table, or might contract it |
| * if two adjacent ranges can be merged. |
| * We binary-search to find the 'insertion' point, then |
| * decide how best to handle it. |
| */ |
| static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
| int acknowledged) |
| { |
| u64 *p; |
| int lo, hi; |
| int rv = 1; |
| unsigned long flags; |
| |
| if (bb->shift < 0) |
| /* badblocks are disabled */ |
| return 0; |
| |
| if (bb->shift) { |
| /* round the start down, and the end up */ |
| sector_t next = s + sectors; |
| s >>= bb->shift; |
| next += (1<<bb->shift) - 1; |
| next >>= bb->shift; |
| sectors = next - s; |
| } |
| |
| write_seqlock_irqsave(&bb->lock, flags); |
| |
| p = bb->page; |
| lo = 0; |
| hi = bb->count; |
| /* Find the last range that starts at-or-before 's' */ |
| while (hi - lo > 1) { |
| int mid = (lo + hi) / 2; |
| sector_t a = BB_OFFSET(p[mid]); |
| if (a <= s) |
| lo = mid; |
| else |
| hi = mid; |
| } |
| if (hi > lo && BB_OFFSET(p[lo]) > s) |
| hi = lo; |
| |
| if (hi > lo) { |
| /* we found a range that might merge with the start |
| * of our new range |
| */ |
| sector_t a = BB_OFFSET(p[lo]); |
| sector_t e = a + BB_LEN(p[lo]); |
| int ack = BB_ACK(p[lo]); |
| if (e >= s) { |
| /* Yes, we can merge with a previous range */ |
| if (s == a && s + sectors >= e) |
| /* new range covers old */ |
| ack = acknowledged; |
| else |
| ack = ack && acknowledged; |
| |
| if (e < s + sectors) |
| e = s + sectors; |
| if (e - a <= BB_MAX_LEN) { |
| p[lo] = BB_MAKE(a, e-a, ack); |
| s = e; |
| } else { |
| /* does not all fit in one range, |
| * make p[lo] maximal |
| */ |
| if (BB_LEN(p[lo]) != BB_MAX_LEN) |
| p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); |
| s = a + BB_MAX_LEN; |
| } |
| sectors = e - s; |
| } |
| } |
| if (sectors && hi < bb->count) { |
| /* 'hi' points to the first range that starts after 's'. |
| * Maybe we can merge with the start of that range */ |
| sector_t a = BB_OFFSET(p[hi]); |
| sector_t e = a + BB_LEN(p[hi]); |
| int ack = BB_ACK(p[hi]); |
| if (a <= s + sectors) { |
| /* merging is possible */ |
| if (e <= s + sectors) { |
| /* full overlap */ |
| e = s + sectors; |
| ack = acknowledged; |
| } else |
| ack = ack && acknowledged; |
| |
| a = s; |
| if (e - a <= BB_MAX_LEN) { |
| p[hi] = BB_MAKE(a, e-a, ack); |
| s = e; |
| } else { |
| p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); |
| s = a + BB_MAX_LEN; |
| } |
| sectors = e - s; |
| lo = hi; |
| hi++; |
| } |
| } |
| if (sectors == 0 && hi < bb->count) { |
| /* we might be able to combine lo and hi */ |
| /* Note: 's' is at the end of 'lo' */ |
| sector_t a = BB_OFFSET(p[hi]); |
| int lolen = BB_LEN(p[lo]); |
| int hilen = BB_LEN(p[hi]); |
| int newlen = lolen + hilen - (s - a); |
| if (s >= a && newlen < BB_MAX_LEN) { |
| /* yes, we can combine them */ |
| int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); |
| p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); |
| memmove(p + hi, p + hi + 1, |
| (bb->count - hi - 1) * 8); |
| bb->count--; |
| } |
| } |
| while (sectors) { |
| /* didn't merge (it all). |
| * Need to add a range just before 'hi' */ |
| if (bb->count >= MD_MAX_BADBLOCKS) { |
| /* No room for more */ |
| rv = 0; |
| break; |
| } else { |
| int this_sectors = sectors; |
| memmove(p + hi + 1, p + hi, |
| (bb->count - hi) * 8); |
| bb->count++; |
| |
| if (this_sectors > BB_MAX_LEN) |
| this_sectors = BB_MAX_LEN; |
| p[hi] = BB_MAKE(s, this_sectors, acknowledged); |
| sectors -= this_sectors; |
| s += this_sectors; |
| } |
| } |
| |
| bb->changed = 1; |
| if (!acknowledged) |
| bb->unacked_exist = 1; |
| write_sequnlock_irqrestore(&bb->lock, flags); |
| |
| return rv; |
| } |
| |
| int rdev_set_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 = md_set_badblocks(&rdev->badblocks, |
| s, sectors, 0); |
| if (rv) { |
| /* Make sure they get written out promptly */ |
| sysfs_notify_dirent_safe(rdev->sysfs_state); |
| set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
| md_wakeup_thread(rdev->mddev->thread); |
| } |
| return rv; |
| } |
| EXPORT_SYMBOL_GPL(rdev_set_badblocks); |
| |
| /* |
| * Remove a range of bad blocks from the table. |
| * This may involve extending the table if we spilt a region, |
| * but it must not fail. So if the table becomes full, we just |
| * drop the remove request. |
| */ |
| static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) |
| { |
| u64 *p; |
| int lo, hi; |
| sector_t target = s + sectors; |
| int rv = 0; |
| |
| if (bb->shift > 0) { |
| /* When clearing we round the start up and the end down. |
| * This should not matter as the shift should align with |
| * the block size and no rounding should ever be needed. |
| * However it is better the think a block is bad when it |
| * isn't than to think a block is not bad when it is. |
| */ |
| s += (1<<bb->shift) - 1; |
| s >>= bb->shift; |
| target >>= bb->shift; |
| sectors = target - s; |
| } |
| |
| write_seqlock_irq(&bb->lock); |
| |
| p = bb->page; |
| lo = 0; |
| hi = bb->count; |
| /* Find the last range that starts before 'target' */ |
| while (hi - lo > 1) { |
| int mid = (lo + hi) / 2; |
| sector_t a = BB_OFFSET(p[mid]); |
| if (a < target) |
| lo = mid; |
| else |
| hi = mid; |
| } |
| if (hi > lo) { |
| /* p[lo] is the last range that could overlap the |
| * current range. Earlier ranges could also overlap, |
| * but only this one can overlap the end of the range. |
| */ |
| if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { |
| /* Partial overlap, leave the tail of this range */ |
| int ack = BB_ACK(p[lo]); |
| sector_t a = BB_OFFSET(p[lo]); |
| sector_t end = a + BB_LEN(p[lo]); |
| |
| if (a < s) { |
| /* we need to split this range */ |
| if (bb->count >= MD_MAX_BADBLOCKS) { |
| rv = 0; |
| goto out; |
| } |
| memmove(p+lo+1, p+lo, (bb->count - lo) * 8); |
| bb->count++; |
| p[lo] = BB_MAKE(a, s-a, ack); |
| lo++; |
| } |
| p[lo] = BB_MAKE(target, end - target, ack); |
| /* there is no longer an overlap */ |
| hi = lo; |
| lo--; |
| } |
| while (lo >= 0 && |
| BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { |
| /* This range does overlap */ |
| if (BB_OFFSET(p[lo]) < s) { |
| /* Keep the early parts of this range. */ |
| int ack = BB_ACK(p[lo]); |
| sector_t start = BB_OFFSET(p[lo]); |
| p[lo] = BB_MAKE(start, s - start, ack); |
| /* now low doesn't overlap, so.. */ |
| break; |
| } |
| lo--; |
| } |
| /* 'lo' is strictly before, 'hi' is strictly after, |
| * anything between needs to be discarded |
| */ |
| if (hi - lo > 1) { |
| memmove(p+lo+1, p+hi, (bb->count - hi) * 8); |
| bb->count -= (hi - lo - 1); |
| } |
| } |
| |
| bb->changed = 1; |
| out: |
| write_sequnlock_irq(&bb->lock); |
| return rv; |
| } |
| |
| int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
| int is_new) |
| { |
| if (is_new) |
| s += rdev->new_data_offset; |
| else |
| s += rdev->data_offset; |
| return md_clear_badblocks(&rdev->badblocks, |
| s, sectors); |
| } |
| EXPORT_SYMBOL_GPL(rdev_clear_badblocks); |
| |
| /* |
| * Acknowledge all bad blocks in a list. |
| * This only succeeds if ->changed is clear. It is used by |
| * in-kernel metadata updates |
| */ |
| void md_ack_all_badblocks(struct badblocks *bb) |
| { |
| if (bb->page == NULL || bb->changed) |
| /* no point even trying */ |
| return; |
| write_seqlock_irq(&bb->lock); |
| |
| if (bb->changed == 0 && bb->unacked_exist) { |
| u64 *p = bb->page; |
| int i; |
| for (i = 0; i < bb->count ; i++) { |
| if (!BB_ACK(p[i])) { |
| sector_t start = BB_OFFSET(p[i]); |
| int len = BB_LEN(p[i]); |
| p[i] = BB_MAKE(start, len, 1); |
| } |
| } |
| bb->unacked_exist = 0; |
| } |
| write_sequnlock_irq(&bb->lock); |
| } |
| EXPORT_SYMBOL_GPL(md_ack_all_badblocks); |
| |
| /* sysfs access to bad-blocks list. |
| * We present two files. |
| * 'bad-blocks' lists sector numbers and lengths of ranges that |
| * are recorded as bad. The list is truncated to fit within |
| * the one-page limit of sysfs. |
| * Writing "sector length" to this file adds an acknowledged |
| * bad block list. |
| * 'unacknowledged-bad-blocks' lists bad blocks that have not yet |
| * been acknowledged. Writing to this file adds bad blocks |
| * without acknowledging them. This is largely for testing. |
| */ |
| |
| static ssize_t |
| badblocks_show(struct badblocks *bb, char *page, int unack) |
| { |
| size_t len; |
| int i; |
| u64 *p = bb->page; |
| unsigned seq; |
| |
| if (bb->shift < 0) |
| return 0; |
| |
| retry: |
| seq = read_seqbegin(&bb->lock); |
| |
| len = 0; |
| i = 0; |
| |
| while (len < PAGE_SIZE && i < bb->count) { |
| sector_t s = BB_OFFSET(p[i]); |
| unsigned int length = BB_LEN(p[i]); |
| int ack = BB_ACK(p[i]); |
| i++; |
| |
| if (unack && ack) |
| continue; |
| |
| len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", |
| (unsigned long long)s << bb->shift, |
| length << bb->shift); |
| } |
| if (unack && len == 0) |
| bb->unacked_exist = 0; |
| |
| if (read_seqretry(&bb->lock, seq)) |
| goto retry; |
| |
| return len; |
| } |
| |
| #define DO_DEBUG 1 |
| |
| static ssize_t |
| badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) |
| { |
| unsigned long long sector; |
| int length; |
| char newline; |
| #ifdef DO_DEBUG |
| /* Allow clearing via sysfs *only* for testing/debugging. |
| * Normally only a successful write may clear a badblock |
| */ |
| int clear = 0; |
| if (page[0] == '-') { |
| clear = 1; |
| page++; |
| } |
| #endif /* DO_DEBUG */ |
| |
| switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { |
| case 3: |
| if (newline != '\n') |
| return -EINVAL; |
| case 2: |
| if (length <= 0) |
| return -EINVAL; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| #ifdef DO_DEBUG |
| if (clear) { |
| md_clear_badblocks(bb, sector, length); |
| return len; |
| } |
| #endif /* DO_DEBUG */ |
| if (md_set_badblocks(bb, sector, length, !unack)) |
| return len; |
| else |
| return -ENOSPC; |
| } |
| |
| static int md_notify_reboot(struct notifier_block *this, |
| unsigned long code, void *x) |
| { |
| struct list_head *tmp; |
| struct mddev *mddev; |
| int need_delay = 0; |
| |
| for_each_mddev(mddev, tmp) { |
| if (mddev_trylock(mddev)) { |
| if (mddev->pers) |
| __md_stop_writes(mddev); |
| if (mddev->persistent) |
| mddev->safemode = 2; |
| mddev_unlock(mddev); |
| } |
| need_delay = 1; |
| } |
| /* |
| * certain more exotic SCSI devices are known to be |
| * volatile wrt too early system reboots. While the |
| * right place to handle this issue is the given |
| * driver, we do want to have a safe RAID driver ... |
| */ |
| if (need_delay) |
| mdelay(1000*1); |
| |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block md_notifier = { |
| .notifier_call = md_notify_reboot, |
| .next = NULL, |
| .priority = INT_MAX, /* before any real devices */ |
| }; |
| |
| static void md_geninit(void) |
| { |
| pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
| |
| proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
| } |
| |
| static int __init md_init(void) |
| { |
| int ret = -ENOMEM; |
| |
| md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
| if (!md_wq) |
| goto err_wq; |
| |
| md_misc_wq = alloc_workqueue("md_misc", 0, 0); |
| if (!md_misc_wq) |
| goto err_misc_wq; |
| |
| if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) |
| goto err_md; |
| |
| if ((ret = register_blkdev(0, "mdp")) < 0) |
| goto err_mdp; |
| mdp_major = ret; |
| |
| blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
| md_probe, NULL, NULL); |
| blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, |
| md_probe, NULL, NULL); |
| |
| register_reboot_notifier(&md_notifier); |
| raid_table_header = register_sysctl_table(raid_root_table); |
| |
| md_geninit(); |
| return 0; |
| |
| err_mdp: |
| unregister_blkdev(MD_MAJOR, "md"); |
| err_md: |
| destroy_workqueue(md_misc_wq); |
| err_misc_wq: |
| destroy_workqueue(md_wq); |
| err_wq: |
| return ret; |
| } |
| |
| #ifndef MODULE |
| |
| /* |
| * Searches all registered partitions for autorun RAID arrays |
| * at boot time. |
| */ |
| |
| static LIST_HEAD(all_detected_devices); |
| struct detected_devices_node { |
| struct list_head list; |
| dev_t dev; |
| }; |
| |
| void md_autodetect_dev(dev_t dev) |
| { |
| struct detected_devices_node *node_detected_dev; |
| |
| node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); |
| if (node_detected_dev) { |
| node_detected_dev->dev = dev; |
| list_add_tail(&node_detected_dev->list, &all_detected_devices); |
| } else { |
| printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" |
| ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); |
| } |
| } |
| |
| |
| static void autostart_arrays(int part) |
| { |
| struct md_rdev *rdev; |
| struct detected_devices_node *node_detected_dev; |
| dev_t dev; |
| int i_scanned, i_passed; |
| |
| i_scanned = 0; |
| i_passed = 0; |
| |
| printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
| |
| while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
| i_scanned++; |
| node_detected_dev = list_entry(all_detected_devices.next, |
| struct detected_devices_node, list); |
| list_del(&node_detected_dev->list); |
| dev = node_detected_dev->dev; |
| kfree(node_detected_dev); |
| rdev = md_import_device(dev,0, 90); |
| if (IS_ERR(rdev)) |
| continue; |
| |
| if (test_bit(Faulty, &rdev->flags)) { |
| MD_BUG(); |
| continue; |
| } |
| set_bit(AutoDetected, &rdev->flags); |
| list_add(&rdev->same_set, &pending_raid_disks); |
| i_passed++; |
| } |
| |
| printk(KERN_INFO "md: Scanned %d and added %d devices.\n", |
| i_scanned, i_passed); |
| |
| autorun_devices(part); |
| } |
| |
| #endif /* !MODULE */ |
| |
| static __exit void md_exit(void) |
| { |
| struct mddev *mddev; |
| struct list_head *tmp; |
| |
| blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
| blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
| |
| unregister_blkdev(MD_MAJOR,"md"); |
| unregister_blkdev(mdp_major, "mdp"); |
| unregister_reboot_notifier(&md_notifier); |
| unregister_sysctl_table(raid_table_header); |
| remove_proc_entry("mdstat", NULL); |
| for_each_mddev(mddev, tmp) { |
| export_array(mddev); |
| mddev->hold_active = 0; |
| } |
| destroy_workqueue(md_misc_wq); |
| destroy_workqueue(md_wq); |
| } |
| |
| subsys_initcall(md_init); |
| module_exit(md_exit) |
| |
| static int get_ro(char *buffer, struct kernel_param *kp) |
| { |
| return sprintf(buffer, "%d", start_readonly); |
| } |
| static int set_ro(const char *val, struct kernel_param *kp) |
| { |
| char *e; |
| int num = simple_strtoul(val, &e, 10); |
| if (*val && (*e == '\0' || *e == '\n')) { |
| start_readonly = num; |
| return 0; |
| } |
| return -EINVAL; |
| } |
| |
| 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); |
| |
| EXPORT_SYMBOL(register_md_personality); |
| EXPORT_SYMBOL(unregister_md_personality); |
| EXPORT_SYMBOL(md_error); |
| EXPORT_SYMBOL(md_done_sync); |
| EXPORT_SYMBOL(md_write_start); |
| EXPORT_SYMBOL(md_write_end); |
| EXPORT_SYMBOL(md_register_thread); |
| EXPORT_SYMBOL(md_unregister_thread); |
| EXPORT_SYMBOL(md_wakeup_thread); |
| EXPORT_SYMBOL(md_check_recovery); |
| EXPORT_SYMBOL(md_reap_sync_thread); |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("MD RAID framework"); |
| MODULE_ALIAS("md"); |
| MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |