| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Neil Brown | 32352 | 66.78% | 549 | 55.45% |
| Linus Torvalds (pre-git) | 3376 | 6.97% | 30 | 3.03% |
| Goldwyn Rodrigues | 1789 | 3.69% | 23 | 2.32% |
| Guoqing Jiang | 1244 | 2.57% | 30 | 3.03% |
| Dan J Williams | 1031 | 2.13% | 18 | 1.82% |
| Shaohua Li | 898 | 1.85% | 28 | 2.83% |
| Artur Paszkiewicz | 893 | 1.84% | 5 | 0.51% |
| Xiao Jiang | 824 | 1.70% | 11 | 1.11% |
| Jonathan E Brassow | 512 | 1.06% | 14 | 1.41% |
| Andre Noll | 504 | 1.04% | 21 | 2.12% |
| Andrew Morton | 393 | 0.81% | 19 | 1.92% |
| Song Liu | 387 | 0.80% | 8 | 0.81% |
| Chris Webb | 356 | 0.73% | 1 | 0.10% |
| Linus Torvalds | 322 | 0.66% | 24 | 2.42% |
| Al Viro | 305 | 0.63% | 21 | 2.12% |
| Alexey Dobriyan | 282 | 0.58% | 3 | 0.30% |
| Yufen Yu | 224 | 0.46% | 6 | 0.61% |
| Tomasz Majchrzak | 212 | 0.44% | 6 | 0.61% |
| Tejun Heo | 180 | 0.37% | 10 | 1.01% |
| Paul Clements | 162 | 0.33% | 1 | 0.10% |
| Christoph Hellwig | 133 | 0.27% | 16 | 1.62% |
| Bernd Schubert | 130 | 0.27% | 1 | 0.10% |
| Michael J. Evans | 127 | 0.26% | 1 | 0.10% |
| Arnd Bergmann | 104 | 0.21% | 3 | 0.30% |
| Robert Becker | 103 | 0.21% | 1 | 0.10% |
| Martin K. Petersen | 101 | 0.21% | 5 | 0.51% |
| Jianpeng Ma | 98 | 0.20% | 7 | 0.71% |
| Kent Overstreet | 97 | 0.20% | 6 | 0.61% |
| Bingjing Chang | 93 | 0.19% | 1 | 0.10% |
| Nicolas Schichan | 84 | 0.17% | 1 | 0.10% |
| Vishal Verma | 82 | 0.17% | 1 | 0.10% |
| Pawel Baldysiak | 62 | 0.13% | 2 | 0.20% |
| Guilherme G. Piccoli | 61 | 0.13% | 1 | 0.10% |
| Xiao Ni | 52 | 0.11% | 5 | 0.51% |
| Jens Axboe | 48 | 0.10% | 6 | 0.61% |
| Maciej Trela | 41 | 0.08% | 3 | 0.30% |
| Iustin Pop | 40 | 0.08% | 1 | 0.10% |
| Mariusz Tkaczyk | 39 | 0.08% | 1 | 0.10% |
| Deepa Dinamani | 39 | 0.08% | 1 | 0.10% |
| Heinz Mauelshagen | 38 | 0.08% | 2 | 0.20% |
| Greg Kroah-Hartman | 33 | 0.07% | 6 | 0.61% |
| Andy Shevchenko | 30 | 0.06% | 2 | 0.20% |
| Américo Wang | 30 | 0.06% | 1 | 0.10% |
| Hannes Reinecke | 29 | 0.06% | 1 | 0.10% |
| Mike Snitzer | 28 | 0.06% | 2 | 0.20% |
| Gu Zheng | 27 | 0.06% | 1 | 0.10% |
| Michael Christie | 25 | 0.05% | 2 | 0.20% |
| Sebastian Riemer | 24 | 0.05% | 1 | 0.10% |
| kernelmail | 24 | 0.05% | 1 | 0.10% |
| Kees Cook | 20 | 0.04% | 2 | 0.20% |
| Kay Sievers | 17 | 0.04% | 1 | 0.10% |
| Alexey Obitotskiy | 17 | 0.04% | 2 | 0.20% |
| Jack Wang | 16 | 0.03% | 1 | 0.10% |
| Daniel P. Berrange | 15 | 0.03% | 1 | 0.10% |
| Michael Callahan | 15 | 0.03% | 2 | 0.20% |
| Bart Van Assche | 14 | 0.03% | 2 | 0.20% |
| Namhyung Kim | 14 | 0.03% | 2 | 0.20% |
| Chris Mason | 12 | 0.02% | 1 | 0.10% |
| Cheng Renquan | 12 | 0.02% | 1 | 0.10% |
| Chao Yu | 12 | 0.02% | 1 | 0.10% |
| Nate Dailey | 11 | 0.02% | 1 | 0.10% |
| Jun'ichi Nomura | 10 | 0.02% | 1 | 0.10% |
| Mikulas Patocka | 10 | 0.02% | 1 | 0.10% |
| Thomas Gleixner | 10 | 0.02% | 2 | 0.20% |
| Raz Ben-Jehuda (caro) | 9 | 0.02% | 1 | 0.10% |
| Yuanhan Liu | 9 | 0.02% | 1 | 0.10% |
| Sasha Levin | 9 | 0.02% | 1 | 0.10% |
| Jingoo Han | 8 | 0.02% | 1 | 0.10% |
| David Jeffery | 8 | 0.02% | 1 | 0.10% |
| Zhilong Liu | 7 | 0.01% | 1 | 0.10% |
| Lei Ming | 7 | 0.01% | 1 | 0.10% |
| Benjamin Randazzo | 7 | 0.01% | 2 | 0.20% |
| Arjan van de Ven | 7 | 0.01% | 2 | 0.20% |
| Jeff Garzik | 7 | 0.01% | 1 | 0.10% |
| Adrian Bunk | 6 | 0.01% | 2 | 0.20% |
| Zdenek Kabelac | 6 | 0.01% | 1 | 0.10% |
| André Goddard Rosa | 5 | 0.01% | 1 | 0.10% |
| Ingo Molnar | 5 | 0.01% | 2 | 0.20% |
| Jan Kara | 5 | 0.01% | 2 | 0.20% |
| Darrick J. Wong | 5 | 0.01% | 1 | 0.10% |
| Jason Yan | 4 | 0.01% | 2 | 0.20% |
| Amir Goldstein | 4 | 0.01% | 1 | 0.10% |
| Rasmus Villemoes | 3 | 0.01% | 1 | 0.10% |
| Eric W. Biedermann | 3 | 0.01% | 1 | 0.10% |
| Stephen Rothwell | 3 | 0.01% | 1 | 0.10% |
| Paul Gortmaker | 3 | 0.01% | 1 | 0.10% |
| Joe Perches | 3 | 0.01% | 1 | 0.10% |
| Harvey Harrison | 3 | 0.01% | 1 | 0.10% |
| Denis V. Lunev | 3 | 0.01% | 1 | 0.10% |
| Pavel Emelyanov | 3 | 0.01% | 1 | 0.10% |
| Eric Sesterhenn / Snakebyte | 3 | 0.01% | 1 | 0.10% |
| Nigel Cunningham | 2 | 0.00% | 1 | 0.10% |
| Rémi Rérolle | 2 | 0.00% | 1 | 0.10% |
| Pavel Machek | 2 | 0.00% | 1 | 0.10% |
| Emese Revfy | 2 | 0.00% | 1 | 0.10% |
| Marcos Paulo de Souza | 2 | 0.00% | 2 | 0.20% |
| Ahmed S. Darwish | 2 | 0.00% | 1 | 0.10% |
| Jesper Juhl | 1 | 0.00% | 1 | 0.10% |
| Miklos Szeredi | 1 | 0.00% | 1 | 0.10% |
| Masanari Iida | 1 | 0.00% | 1 | 0.10% |
| Roman Gushchin | 1 | 0.00% | 1 | 0.10% |
| Mark Rutland | 1 | 0.00% | 1 | 0.10% |
| Peter Zijlstra | 1 | 0.00% | 1 | 0.10% |
| Wei Fang | 1 | 0.00% | 1 | 0.10% |
| Dave Jones | 1 | 0.00% | 1 | 0.10% |
| Nick Andrew | 1 | 0.00% | 1 | 0.10% |
| Michael Hayes | 1 | 0.00% | 1 | 0.10% |
| Steven Cole | 1 | 0.00% | 1 | 0.10% |
| Cihangir Akturk | 1 | 0.00% | 1 | 0.10% |
| Firo Yang | 1 | 0.00% | 1 | 0.10% |
| Chris Dunlop | 1 | 0.00% | 1 | 0.10% |
| Bian Yu | 1 | 0.00% | 1 | 0.10% |
| Andi Kleen | 1 | 0.00% | 1 | 0.10% |
| Lidong Zhong | 1 | 0.00% | 1 | 0.10% |
| Jan Engelhardt | 1 | 0.00% | 1 | 0.10% |
| Andries E. Brouwer | 1 | 0.00% | 1 | 0.10% |
| Total | 48449 | 990 |
// SPDX-License-Identifier: GPL-2.0-or-later /* 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. Errors, Warnings, etc. Please use: pr_crit() for error conditions that risk data loss pr_err() for error conditions that are unexpected, like an IO error or internal inconsistency pr_warn() for error conditions that could have been predicated, like adding a device to an array when it has incompatible metadata pr_info() for every interesting, very rare events, like an array starting or stopping, or resync starting or stopping pr_debug() for everything else. */ #include <linux/sched/mm.h> #include <linux/sched/signal.h> #include <linux/kthread.h> #include <linux/blkdev.h> #include <linux/badblocks.h> #include <linux/sysctl.h> #include <linux/seq_file.h> #include <linux/fs.h> #include <linux/poll.h> #include <linux/ctype.h> #include <linux/string.h> #include <linux/hdreg.h> #include <linux/proc_fs.h> #include <linux/random.h> #include <linux/module.h> #include <linux/reboot.h> #include <linux/file.h> #include <linux/compat.h> #include <linux/delay.h> #include <linux/raid/md_p.h> #include <linux/raid/md_u.h> #include <linux/raid/detect.h> #include <linux/slab.h> #include <linux/percpu-refcount.h> #include <linux/part_stat.h> #include <trace/events/block.h> #include "md.h" #include "md-bitmap.h" #include "md-cluster.h" #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 struct kobj_type md_ktype; struct md_cluster_operations *md_cluster_ops; EXPORT_SYMBOL(md_cluster_ops); static struct module *md_cluster_mod; static DECLARE_WAIT_QUEUE_HEAD(resync_wait); static struct workqueue_struct *md_wq; static struct workqueue_struct *md_misc_wq; static int remove_and_add_spares(struct mddev *mddev, struct md_rdev *this); static void mddev_detach(struct mddev *mddev); /* * 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 void rdev_uninit_serial(struct md_rdev *rdev) { if (!test_and_clear_bit(CollisionCheck, &rdev->flags)) return; kvfree(rdev->serial); rdev->serial = NULL; } static void rdevs_uninit_serial(struct mddev *mddev) { struct md_rdev *rdev; rdev_for_each(rdev, mddev) rdev_uninit_serial(rdev); } static int rdev_init_serial(struct md_rdev *rdev) { /* serial_nums equals with BARRIER_BUCKETS_NR */ int i, serial_nums = 1 << ((PAGE_SHIFT - ilog2(sizeof(atomic_t)))); struct serial_in_rdev *serial = NULL; if (test_bit(CollisionCheck, &rdev->flags)) return 0; serial = kvmalloc(sizeof(struct serial_in_rdev) * serial_nums, GFP_KERNEL); if (!serial) return -ENOMEM; for (i = 0; i < serial_nums; i++) { struct serial_in_rdev *serial_tmp = &serial[i]; spin_lock_init(&serial_tmp->serial_lock); serial_tmp->serial_rb = RB_ROOT_CACHED; init_waitqueue_head(&serial_tmp->serial_io_wait); } rdev->serial = serial; set_bit(CollisionCheck, &rdev->flags); return 0; } static int rdevs_init_serial(struct mddev *mddev) { struct md_rdev *rdev; int ret = 0; rdev_for_each(rdev, mddev) { ret = rdev_init_serial(rdev); if (ret) break; } /* Free all resources if pool is not existed */ if (ret && !mddev->serial_info_pool) rdevs_uninit_serial(mddev); return ret; } /* * rdev needs to enable serial stuffs if it meets the conditions: * 1. it is multi-queue device flaged with writemostly. * 2. the write-behind mode is enabled. */ static int rdev_need_serial(struct md_rdev *rdev) { return (rdev && rdev->mddev->bitmap_info.max_write_behind > 0 && rdev->bdev->bd_queue->nr_hw_queues != 1 && test_bit(WriteMostly, &rdev->flags)); } /* * Init resource for rdev(s), then create serial_info_pool if: * 1. rdev is the first device which return true from rdev_enable_serial. * 2. rdev is NULL, means we want to enable serialization for all rdevs. */ void mddev_create_serial_pool(struct mddev *mddev, struct md_rdev *rdev, bool is_suspend) { int ret = 0; if (rdev && !rdev_need_serial(rdev) && !test_bit(CollisionCheck, &rdev->flags)) return; if (!is_suspend) mddev_suspend(mddev); if (!rdev) ret = rdevs_init_serial(mddev); else ret = rdev_init_serial(rdev); if (ret) goto abort; if (mddev->serial_info_pool == NULL) { unsigned int noio_flag; noio_flag = memalloc_noio_save(); mddev->serial_info_pool = mempool_create_kmalloc_pool(NR_SERIAL_INFOS, sizeof(struct serial_info)); memalloc_noio_restore(noio_flag); if (!mddev->serial_info_pool) { rdevs_uninit_serial(mddev); pr_err("can't alloc memory pool for serialization\n"); } } abort: if (!is_suspend) mddev_resume(mddev); } /* * Free resource from rdev(s), and destroy serial_info_pool under conditions: * 1. rdev is the last device flaged with CollisionCheck. * 2. when bitmap is destroyed while policy is not enabled. * 3. for disable policy, the pool is destroyed only when no rdev needs it. */ void mddev_destroy_serial_pool(struct mddev *mddev, struct md_rdev *rdev, bool is_suspend) { if (rdev && !test_bit(CollisionCheck, &rdev->flags)) return; if (mddev->serial_info_pool) { struct md_rdev *temp; int num = 0; /* used to track if other rdevs need the pool */ if (!is_suspend) mddev_suspend(mddev); rdev_for_each(temp, mddev) { if (!rdev) { if (!mddev->serialize_policy || !rdev_need_serial(temp)) rdev_uninit_serial(temp); else num++; } else if (temp != rdev && test_bit(CollisionCheck, &temp->flags)) num++; } if (rdev) rdev_uninit_serial(rdev); if (num) pr_info("The mempool could be used by other devices\n"); else { mempool_destroy(mddev->serial_info_pool); mddev->serial_info_pool = NULL; } if (!is_suspend) mddev_resume(mddev); } } static struct ctl_table_header *raid_table_header; static struct ctl_table raid_table[] = { { .procname = "speed_limit_min", .data = &sysctl_speed_limit_min, .maxlen = sizeof(int), .mode = S_IRUGO|S_IWUSR, .proc_handler = proc_dointvec, }, { .procname = "speed_limit_max", .data = &sysctl_speed_limit_max, .maxlen = sizeof(int), .mode = S_IRUGO|S_IWUSR, .proc_handler = proc_dointvec, }, { } }; static 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; /* * The original mechanism for creating an md device is to create * a device node in /dev and to open it. This causes races with device-close. * The preferred method is to write to the "new_array" module parameter. * This can avoid races. * Setting create_on_open to false disables the original mechanism * so all the races disappear. */ static bool create_on_open = true; struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, struct mddev *mddev) { if (!mddev || !bioset_initialized(&mddev->bio_set)) return bio_alloc(gfp_mask, nr_iovecs); return bio_alloc_bioset(gfp_mask, nr_iovecs, &mddev->bio_set); } EXPORT_SYMBOL_GPL(bio_alloc_mddev); static struct bio *md_bio_alloc_sync(struct mddev *mddev) { if (!mddev || !bioset_initialized(&mddev->sync_set)) return bio_alloc(GFP_NOIO, 1); return bio_alloc_bioset(GFP_NOIO, 1, &mddev->sync_set); } /* * 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); /* * 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 bool is_suspended(struct mddev *mddev, struct bio *bio) { if (mddev->suspended) return true; if (bio_data_dir(bio) != WRITE) return false; if (mddev->suspend_lo >= mddev->suspend_hi) return false; if (bio->bi_iter.bi_sector >= mddev->suspend_hi) return false; if (bio_end_sector(bio) < mddev->suspend_lo) return false; return true; } void md_handle_request(struct mddev *mddev, struct bio *bio) { check_suspended: rcu_read_lock(); if (is_suspended(mddev, bio)) { DEFINE_WAIT(__wait); for (;;) { prepare_to_wait(&mddev->sb_wait, &__wait, TASK_UNINTERRUPTIBLE); if (!is_suspended(mddev, bio)) break; rcu_read_unlock(); schedule(); rcu_read_lock(); } finish_wait(&mddev->sb_wait, &__wait); } atomic_inc(&mddev->active_io); rcu_read_unlock(); if (!mddev->pers->make_request(mddev, bio)) { atomic_dec(&mddev->active_io); wake_up(&mddev->sb_wait); goto check_suspended; } if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) wake_up(&mddev->sb_wait); } EXPORT_SYMBOL(md_handle_request); static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) { const int rw = bio_data_dir(bio); const int sgrp = op_stat_group(bio_op(bio)); struct mddev *mddev = q->queuedata; unsigned int sectors; if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) { bio_io_error(bio); return BLK_QC_T_NONE; } blk_queue_split(q, &bio); if (mddev == NULL || mddev->pers == NULL) { bio_io_error(bio); return BLK_QC_T_NONE; } if (mddev->ro == 1 && unlikely(rw == WRITE)) { if (bio_sectors(bio) != 0) bio->bi_status = BLK_STS_IOERR; bio_endio(bio); return BLK_QC_T_NONE; } /* * save the sectors now since our bio can * go away inside make_request */ sectors = bio_sectors(bio); /* bio could be mergeable after passing to underlayer */ bio->bi_opf &= ~REQ_NOMERGE; md_handle_request(mddev, bio); part_stat_lock(); part_stat_inc(&mddev->gendisk->part0, ios[sgrp]); part_stat_add(&mddev->gendisk->part0, sectors[sgrp], sectors); part_stat_unlock(); return BLK_QC_T_NONE; } /* mddev_suspend makes sure no new requests are submitted * to the device, and that any requests that have been submitted * are completely handled. * Once mddev_detach() is called and completes, the module will be * completely unused. */ void mddev_suspend(struct mddev *mddev) { WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk); lockdep_assert_held(&mddev->reconfig_mutex); if (mddev->suspended++) return; synchronize_rcu(); wake_up(&mddev->sb_wait); set_bit(MD_ALLOW_SB_UPDATE, &mddev->flags); smp_mb__after_atomic(); wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); mddev->pers->quiesce(mddev, 1); clear_bit_unlock(MD_ALLOW_SB_UPDATE, &mddev->flags); wait_event(mddev->sb_wait, !test_bit(MD_UPDATING_SB, &mddev->flags)); del_timer_sync(&mddev->safemode_timer); } EXPORT_SYMBOL_GPL(mddev_suspend); void mddev_resume(struct mddev *mddev) { lockdep_assert_held(&mddev->reconfig_mutex); if (--mddev->suspended) return; 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) { struct md_personality *pers = mddev->pers; int ret = 0; rcu_read_lock(); if (mddev->suspended) ret = 1; else if (pers && pers->congested) ret = pers->congested(mddev, bits); rcu_read_unlock(); return ret; } EXPORT_SYMBOL_GPL(mddev_congested); static int md_congested(void *data, int bits) { struct mddev *mddev = data; return mddev_congested(mddev, bits); } /* * Generic flush handling for md */ static void md_end_flush(struct bio *bio) { 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; mddev->start_flush = ktime_get_boottime(); INIT_WORK(&mddev->flush_work, md_submit_flush_data); atomic_set(&mddev->flush_pending, 1); rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) { /* Take two references, one is dropped * when request finishes, one after * we reclaim rcu_read_lock */ struct bio *bi; atomic_inc(&rdev->nr_pending); atomic_inc(&rdev->nr_pending); rcu_read_unlock(); bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); bi->bi_end_io = md_end_flush; bi->bi_private = rdev; bio_set_dev(bi, rdev->bdev); bi->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH; atomic_inc(&mddev->flush_pending); submit_bio(bi); rcu_read_lock(); rdev_dec_pending(rdev, mddev); } rcu_read_unlock(); if (atomic_dec_and_test(&mddev->flush_pending)) queue_work(md_wq, &mddev->flush_work); } static void md_submit_flush_data(struct work_struct *ws) { struct mddev *mddev = container_of(ws, struct mddev, flush_work); struct bio *bio = mddev->flush_bio; /* * must reset flush_bio before calling into md_handle_request to avoid a * deadlock, because other bios passed md_handle_request suspend check * could wait for this and below md_handle_request could wait for those * bios because of suspend check */ mddev->last_flush = mddev->start_flush; mddev->flush_bio = NULL; wake_up(&mddev->sb_wait); if (bio->bi_iter.bi_size == 0) { /* an empty barrier - all done */ bio_endio(bio); } else { bio->bi_opf &= ~REQ_PREFLUSH; md_handle_request(mddev, bio); } } /* * Manages consolidation of flushes and submitting any flushes needed for * a bio with REQ_PREFLUSH. Returns true if the bio is finished or is * being finished in another context. Returns false if the flushing is * complete but still needs the I/O portion of the bio to be processed. */ bool md_flush_request(struct mddev *mddev, struct bio *bio) { ktime_t start = ktime_get_boottime(); spin_lock_irq(&mddev->lock); wait_event_lock_irq(mddev->sb_wait, !mddev->flush_bio || ktime_after(mddev->last_flush, start), mddev->lock); if (!ktime_after(mddev->last_flush, start)) { WARN_ON(mddev->flush_bio); mddev->flush_bio = bio; bio = NULL; } spin_unlock_irq(&mddev->lock); if (!bio) { INIT_WORK(&mddev->flush_work, submit_flushes); queue_work(md_wq, &mddev->flush_work); } else { /* flush was performed for some other bio while we waited. */ if (bio->bi_iter.bi_size == 0) /* an empty barrier - all done */ bio_endio(bio); else { bio->bi_opf &= ~REQ_PREFLUSH; return false; } } return true; } EXPORT_SYMBOL(md_flush_request); 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) { 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); /* * 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); } spin_unlock(&all_mddevs_lock); } static void md_safemode_timeout(struct timer_list *t); void mddev_init(struct mddev *mddev) { kobject_init(&mddev->kobj, &md_ktype); 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); timer_setup(&mddev->safemode_timer, md_safemode_timeout, 0); atomic_set(&mddev->active, 1); atomic_set(&mddev->openers, 0); atomic_set(&mddev->active_io, 0); spin_lock_init(&mddev->lock); atomic_set(&mddev->flush_pending, 0); init_waitqueue_head(&mddev->sb_wait); init_waitqueue_head(&mddev->recovery_wait); mddev->reshape_position = MaxSector; mddev->reshape_backwards = 0; mddev->last_sync_action = "none"; mddev->resync_min = 0; mddev->resync_max = MaxSector; mddev->level = LEVEL_NONE; } EXPORT_SYMBOL_GPL(mddev_init); static struct mddev *mddev_find(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 struct attribute_group md_redundancy_group; 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); wake_up(&mddev->sb_wait); spin_unlock(&pers_lock); } EXPORT_SYMBOL_GPL(mddev_unlock); struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) { struct md_rdev *rdev; rdev_for_each_rcu(rdev, mddev) if (rdev->desc_nr == nr) return rdev; return NULL; } EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) { struct md_rdev *rdev; rdev_for_each(rdev, mddev) if (rdev->bdev->bd_dev == dev) return rdev; return NULL; } struct md_rdev *md_find_rdev_rcu(struct mddev *mddev, dev_t dev) { struct md_rdev *rdev; rdev_for_each_rcu(rdev, mddev) if (rdev->bdev->bd_dev == dev) return rdev; return NULL; } EXPORT_SYMBOL_GPL(md_find_rdev_rcu); static struct md_personality *find_pers(int level, char *clevel) { struct md_personality *pers; list_for_each_entry(pers, &pers_list, list) { if (level != LEVEL_NONE && pers->level == level) return pers; if (strcmp(pers->name, clevel)==0) return pers; } return NULL; } /* 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) { rdev->sb_page = alloc_page(GFP_KERNEL); if (!rdev->sb_page) return -ENOMEM; return 0; } void md_rdev_clear(struct md_rdev *rdev) { if (rdev->sb_page) { put_page(rdev->sb_page); rdev->sb_loaded = 0; rdev->sb_page = NULL; rdev->sb_start = 0; rdev->sectors = 0; } if (rdev->bb_page) { put_page(rdev->bb_page); rdev->bb_page = NULL; } badblocks_exit(&rdev->badblocks); } EXPORT_SYMBOL_GPL(md_rdev_clear); static void super_written(struct bio *bio) { struct md_rdev *rdev = bio->bi_private; struct mddev *mddev = rdev->mddev; if (bio->bi_status) { pr_err("md: super_written gets error=%d\n", bio->bi_status); md_error(mddev, rdev); if (!test_bit(Faulty, &rdev->flags) && (bio->bi_opf & MD_FAILFAST)) { set_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags); set_bit(LastDev, &rdev->flags); } } else clear_bit(LastDev, &rdev->flags); if (atomic_dec_and_test(&mddev->pending_writes)) wake_up(&mddev->sb_wait); rdev_dec_pending(rdev, mddev); 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; int ff = 0; if (!page) return; if (test_bit(Faulty, &rdev->flags)) return; bio = md_bio_alloc_sync(mddev); atomic_inc(&rdev->nr_pending); bio_set_dev(bio, 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; if (test_bit(MD_FAILFAST_SUPPORTED, &mddev->flags) && test_bit(FailFast, &rdev->flags) && !test_bit(LastDev, &rdev->flags)) ff = MD_FAILFAST; bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH | REQ_FUA | ff; atomic_inc(&mddev->pending_writes); submit_bio(bio); } int md_super_wait(struct mddev *mddev) { /* wait for all superblock writes that were scheduled to complete */ wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); if (test_and_clear_bit(MD_SB_NEED_REWRITE, &mddev->sb_flags)) return -EAGAIN; return 0; } int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, struct page *page, int op, int op_flags, bool metadata_op) { struct bio *bio = md_bio_alloc_sync(rdev->mddev); int ret; if (metadata_op && rdev->meta_bdev) bio_set_dev(bio, rdev->meta_bdev); else bio_set_dev(bio, rdev->bdev); bio_set_op_attrs(bio, op, op_flags); if (metadata_op) bio->bi_iter.bi_sector = sector + rdev->sb_start; else if (rdev->mddev->reshape_position != MaxSector && (rdev->mddev->reshape_backwards == (sector >= rdev->mddev->reshape_position))) bio->bi_iter.bi_sector = sector + rdev->new_data_offset; else bio->bi_iter.bi_sector = sector + rdev->data_offset; bio_add_page(bio, page, size, 0); submit_bio_wait(bio); ret = !bio->bi_status; 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_loaded) return 0; if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) goto fail; rdev->sb_loaded = 1; return 0; fail: pr_err("md: disabled device %s, could not read superblock.\n", bdevname(rdev->bdev,b)); return -EINVAL; } static int md_uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) { return sb1->set_uuid0 == sb2->set_uuid0 && sb1->set_uuid1 == sb2->set_uuid1 && sb1->set_uuid2 == sb2->set_uuid2 && sb1->set_uuid3 == sb2->set_uuid3; } static int md_sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) { int ret; mdp_super_t *tmp1, *tmp2; tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); if (!tmp1 || !tmp2) { ret = 0; goto abort; } *tmp1 = *sb1; *tmp2 = *sb2; /* * 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; pr_warn("%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; bool spare_disk = true; /* * 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) { pr_warn("md: invalid raid superblock magic on %s\n", b); goto abort; } if (sb->major_version != 0 || sb->minor_version < 90 || sb->minor_version > 91) { pr_warn("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)) { pr_warn("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; /* not spare disk, or LEVEL_MULTIPATH */ if (sb->level == LEVEL_MULTIPATH || (rdev->desc_nr >= 0 && rdev->desc_nr < MD_SB_DISKS && sb->disks[rdev->desc_nr].state & ((1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE)))) spare_disk = false; if (!refdev) { if (!spare_disk) ret = 1; else ret = 0; } else { __u64 ev1, ev2; mdp_super_t *refsb = page_address(refdev->sb_page); if (!md_uuid_equal(refsb, sb)) { pr_warn("md: %s has different UUID to %s\n", b, bdevname(refdev->bdev,b2)); goto abort; } if (!md_sb_equal(refsb, sb)) { pr_warn("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 (!spare_disk && 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 ((u64)rdev->sectors >= (2ULL << 32) && sb->level >= 1) rdev->sectors = (sector_t)(2ULL << 32) - 2; if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) /* "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 (mddev->level == 0) mddev->layout = -1; if (sb->state & (1<<MD_SB_CLEAN)) mddev->recovery_cp = MaxSector; else { if (sb->events_hi == sb->cp_events_hi && sb->events_lo == sb->cp_events_lo) { mddev->recovery_cp = sb->recovery_cp; } else mddev->recovery_cp = 0; } memcpy(mddev->uuid+0, &sb->set_uuid0, 4); memcpy(mddev->uuid+4, &sb->set_uuid1, 4); memcpy(mddev->uuid+8, &sb->set_uuid2, 4); memcpy(mddev->uuid+12,&sb->set_uuid3, 4); mddev->max_disks = MD_SB_DISKS; if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && mddev->bitmap_info.file == NULL) { mddev->bitmap_info.offset = mddev->bitmap_info.default_offset; mddev->bitmap_info.space = mddev->bitmap_info.default_space; } } else if (mddev->pers == NULL) { /* 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); if (desc->state & (1<<MD_DISK_FAILFAST)) set_bit(FailFast, &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 = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); sb->level = mddev->level; sb->size = mddev->dev_sectors / 2; sb->raid_disks = mddev->raid_disks; sb->md_minor = mddev->md_minor; sb->not_persistent = 0; sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); sb->state = 0; sb->events_hi = (mddev->events>>32); sb->events_lo = (u32)mddev->events; if (mddev->reshape_position == MaxSector) sb->minor_version = 90; else { sb->minor_version = 91; sb->reshape_position = mddev->reshape_position; sb->new_level = mddev->new_level; sb->delta_disks = mddev->delta_disks; sb->new_layout = mddev->new_layout; sb->new_chunk = mddev->new_chunk_sectors << 9; } mddev->minor_version = sb->minor_version; if (mddev->in_sync) { sb->recovery_cp = mddev->recovery_cp; sb->cp_events_hi = (mddev->events>>32); sb->cp_events_lo = (u32)mddev->events; if (mddev->recovery_cp == MaxSector) sb->state = (1<< MD_SB_CLEAN); } else sb->recovery_cp = 0; sb->layout = mddev->layout; sb->chunk_size = mddev->chunk_sectors << 9; if (mddev->bitmap && mddev->bitmap_info.file == NULL) sb->state |= (1<<MD_SB_BITMAP_PRESENT); sb->disks[0].state = (1<<MD_DISK_REMOVED); rdev_for_each(rdev2, mddev) { mdp_disk_t *d; int desc_nr; int is_active = test_bit(In_sync, &rdev2->flags); if (rdev2->raid_disk >= 0 && sb->minor_version >= 91) /* 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); if (test_bit(FailFast, &rdev2->flags)) d->state |= (1<<MD_DISK_FAILFAST); } /* 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 ((u64)num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) num_sectors = (sector_t)(2ULL << 32) - 2; do { md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, rdev->sb_page); } while (md_super_wait(rdev->mddev) < 0); return num_sectors; } static int super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) { /* 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 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; bool spare_disk = true; /* * 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) { pr_warn("md: invalid superblock checksum on %s\n", bdevname(rdev->bdev,b)); return -EINVAL; } if (le64_to_cpu(sb->data_size) < 10) { pr_warn("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; __le64 *bbp; int i; int sectors = le16_to_cpu(sb->bblog_size); if (sectors > (PAGE_SIZE / 512)) return -EINVAL; offset = le32_to_cpu(sb->bblog_offset); if (offset == 0) return -EINVAL; bb_sector = (long long)offset; if (!sync_page_io(rdev, bb_sector, sectors << 9, rdev->bb_page, REQ_OP_READ, 0, true)) return -EIO; bbp = (__le64 *)page_address(rdev->bb_page); rdev->badblocks.shift = sb->bblog_shift; for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { u64 bb = le64_to_cpu(*bbp); int count = bb & (0x3ff); u64 sector = bb >> 10; sector <<= sb->bblog_shift; count <<= sb->bblog_shift; if (bb + 1 == 0) break; if (badblocks_set(&rdev->badblocks, sector, count, 1)) return -EINVAL; } } else if (sb->bblog_offset != 0) rdev->badblocks.shift = 0; if ((le32_to_cpu(sb->feature_map) & (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) { rdev->ppl.offset = (__s16)le16_to_cpu(sb->ppl.offset); rdev->ppl.size = le16_to_cpu(sb->ppl.size); rdev->ppl.sector = rdev->sb_start + rdev->ppl.offset; } if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT) && sb->level != 0) return -EINVAL; /* not spare disk, or LEVEL_MULTIPATH */ if (sb->level == cpu_to_le32(LEVEL_MULTIPATH) || (rdev->desc_nr >= 0 && rdev->desc_nr < le32_to_cpu(sb->max_dev) && (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL))) spare_disk = false; if (!refdev) { if (!spare_disk) ret = 1; else ret = 0; } else { __u64 ev1, ev2; struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || sb->level != refsb->level || sb->layout != refsb->layout || sb->chunksize != refsb->chunksize) { pr_warn("md: %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 (!spare_disk && 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); mddev->utime = le64_to_cpu(sb->utime); mddev->level = le32_to_cpu(sb->level); mddev->clevel[0] = 0; mddev->layout = le32_to_cpu(sb->layout); mddev->raid_disks = le32_to_cpu(sb->raid_disks); mddev->dev_sectors = le64_to_cpu(sb->size); mddev->events = ev1; mddev->bitmap_info.offset = 0; mddev->bitmap_info.space = 0; /* 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; } if (mddev->level == 0 && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RAID0_LAYOUT)) mddev->layout = -1; if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) set_bit(MD_HAS_JOURNAL, &mddev->flags); if (le32_to_cpu(sb->feature_map) & (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS)) { if (le32_to_cpu(sb->feature_map) & (MD_FEATURE_BITMAP_OFFSET | MD_FEATURE_JOURNAL)) return -EINVAL; if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_PPL) && (le32_to_cpu(sb->feature_map) & MD_FEATURE_MULTIPLE_PPLS)) return -EINVAL; set_bit(MD_HAS_PPL, &mddev->flags); } } else if (mddev->pers == NULL) { /* 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]) < MD_DISK_ROLE_MAX || le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) if (ev1 < mddev->events) return -EINVAL; } else if (mddev->bitmap) { /* If 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 = MD_DISK_ROLE_SPARE; rdev->desc_nr = -1; } else role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); switch(role) { case MD_DISK_ROLE_SPARE: /* spare */ break; case MD_DISK_ROLE_FAULTY: /* faulty */ set_bit(Faulty, &rdev->flags); break; case MD_DISK_ROLE_JOURNAL: /* journal device */ if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { /* journal device without journal feature */ pr_warn("md: journal device provided without journal feature, ignoring the device\n"); return -EINVAL; } set_bit(Journal, &rdev->flags); rdev->journal_tail = le64_to_cpu(sb->journal_tail); rdev->raid_disk = 0; break; default: rdev->saved_raid_disk = role; if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) { rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_BITMAP)) rdev->saved_raid_disk = -1; } else { /* * If the array is FROZEN, then the device can't * be in_sync with rest of array. */ if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) set_bit(In_sync, &rdev->flags); } rdev->raid_disk = role; break; } if (sb->devflags & WriteMostly1) set_bit(WriteMostly, &rdev->flags); if (sb->devflags & FailFast1) set_bit(FailFast, &rdev->flags); if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) set_bit(Replacement, &rdev->flags); } else /* MULTIPATH are always insync */ set_bit(In_sync, &rdev->flags); 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 if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) sb->resync_offset = cpu_to_le64(MaxSector); else sb->resync_offset = cpu_to_le64(0); sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); sb->raid_disks = cpu_to_le32(mddev->raid_disks); sb->size = cpu_to_le64(mddev->dev_sectors); sb->chunksize = cpu_to_le32(mddev->chunk_sectors); sb->level = cpu_to_le32(mddev->level); sb->layout = cpu_to_le32(mddev->layout); if (test_bit(FailFast, &rdev->flags)) sb->devflags |= FailFast1; else sb->devflags &= ~FailFast1; if (test_bit(WriteMostly, &rdev->flags)) sb->devflags |= WriteMostly1; else sb->devflags &= ~WriteMostly1; sb->data_offset = cpu_to_le64(rdev->data_offset); sb->data_size = cpu_to_le64(rdev->sectors); if (mddev->bitmap && mddev->bitmap_info.file == NULL) { sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); } if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && !test_bit(In_sync, &rdev->flags)) { sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); if (rdev->saved_raid_disk >= 0 && mddev->bitmap) sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); } /* Note: recovery_offset and journal_tail share space */ if (test_bit(Journal, &rdev->flags)) sb->journal_tail = cpu_to_le64(rdev->journal_tail); if (test_bit(Replacement, &rdev->flags)) sb->feature_map |= cpu_to_le32(MD_FEATURE_REPLACEMENT); if (mddev->reshape_position != MaxSector) { sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); sb->reshape_position = cpu_to_le64(mddev->reshape_position); sb->new_layout = cpu_to_le32(mddev->new_layout); sb->delta_disks = cpu_to_le32(mddev->delta_disks); sb->new_level = cpu_to_le32(mddev->new_level); sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); if (mddev->delta_disks == 0 && mddev->reshape_backwards) sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); if (rdev->new_data_offset != rdev->data_offset) { sb->feature_map |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset - rdev->data_offset)); } } if (mddev_is_clustered(mddev)) sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); if (rdev->badblocks.count == 0) /* 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; __le64 *bbp = (__le64 *)page_address(rdev->bb_page); u64 *p = bb->page; sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); if (bb->changed) { unsigned seq; retry: seq = read_seqbegin(&bb->lock); memset(bbp, 0xff, PAGE_SIZE); for (i = 0 ; i < bb->count ; i++) { u64 internal_bb = p[i]; u64 store_bb = ((BB_OFFSET(internal_bb) << 10) | BB_LEN(internal_bb)); bbp[i] = cpu_to_le64(store_bb); } bb->changed = 0; if (read_seqretry(&bb->lock, seq)) goto retry; bb->sector = (rdev->sb_start + (int)le32_to_cpu(sb->bblog_offset)); bb->size = le16_to_cpu(sb->bblog_size); } } max_dev = 0; rdev_for_each(rdev2, mddev) if (rdev2->desc_nr+1 > max_dev) max_dev = rdev2->desc_nr+1; if (max_dev > le32_to_cpu(sb->max_dev)) { int bmask; sb->max_dev = cpu_to_le32(max_dev); rdev->sb_size = max_dev * 2 + 256; bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; if (rdev->sb_size & bmask) rdev->sb_size = (rdev->sb_size | bmask) + 1; } else max_dev = le32_to_cpu(sb->max_dev); for (i=0; i<max_dev;i++) sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); if (test_bit(MD_HAS_PPL, &mddev->flags)) { if (test_bit(MD_HAS_MULTIPLE_PPLS, &mddev->flags)) sb->feature_map |= cpu_to_le32(MD_FEATURE_MULTIPLE_PPLS); else sb->feature_map |= cpu_to_le32(MD_FEATURE_PPL); sb->ppl.offset = cpu_to_le16(rdev->ppl.offset); sb->ppl.size = cpu_to_le16(rdev->ppl.size); } rdev_for_each(rdev2, mddev) { i = rdev2->desc_nr; if (test_bit(Faulty, &rdev2->flags)) sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); else if (test_bit(In_sync, &rdev2->flags)) sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); else if (test_bit(Journal, &rdev2->flags)) sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); else if (rdev2->raid_disk >= 0) sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); else sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); } sb->sb_csum = calc_sb_1_csum(sb); } static 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 = cpu_to_le64(rdev->sb_start); sb->sb_csum = calc_sb_1_csum(sb); do { md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, rdev->sb_page); } while (md_super_wait(rdev->mddev) < 0); return num_sectors; } static int super_1_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) { /* 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) { if (test_bit(Faulty, &rdev->flags) || test_bit(Journal, &rdev->flags) || rdev->raid_disk == -1) continue; rdev_for_each_rcu(rdev2, mddev2) { if (test_bit(Faulty, &rdev2->flags) || test_bit(Journal, &rdev2->flags) || rdev2->raid_disk == -1) continue; if (rdev->bdev->bd_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. */ blk_integrity_register(mddev->gendisk, bdev_get_integrity(reference->bdev)); pr_debug("md: data integrity enabled on %s\n", mdname(mddev)); if (bioset_integrity_create(&mddev->bio_set, BIO_POOL_SIZE)) { pr_err("md: failed to create integrity pool for %s\n", mdname(mddev)); return -EINVAL; } return 0; } EXPORT_SYMBOL(md_integrity_register); /* * Attempt to add an rdev, but only if it is consistent with the current * integrity profile */ int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) { struct blk_integrity *bi_mddev; char name[BDEVNAME_SIZE]; if (!mddev->gendisk) return 0; bi_mddev = blk_get_integrity(mddev->gendisk); if (!bi_mddev) /* nothing to do */ return 0; if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) { pr_err("%s: incompatible integrity profile for %s\n", mdname(mddev), bdevname(rdev->bdev, name)); return -ENXIO; } return 0; } 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; int err; /* prevent duplicates */ if (find_rdev(mddev, rdev->bdev->bd_dev)) return -EEXIST; if ((bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev)) && mddev->pers) return -EROFS; /* make sure rdev->sectors exceeds mddev->dev_sectors */ if (!test_bit(Journal, &rdev->flags) && 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 */ rcu_read_lock(); if (rdev->desc_nr < 0) { int choice = 0; if (mddev->pers) choice = mddev->raid_disks; while (md_find_rdev_nr_rcu(mddev, choice)) choice++; rdev->desc_nr = choice; } else { if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { rcu_read_unlock(); return -EBUSY; } } rcu_read_unlock(); if (!test_bit(Journal, &rdev->flags) && mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { pr_warn("md: %s: array is limited to %d devices\n", mdname(mddev), mddev->max_disks); return -EBUSY; } bdevname(rdev->bdev,b); strreplace(b, '/', '!'); rdev->mddev = mddev; pr_debug("md: bind<%s>\n", b); if (mddev->raid_disks) mddev_create_serial_pool(mddev, rdev, false); if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) goto fail; 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: pr_warn("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]; bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); list_del_rcu(&rdev->same_set); pr_debug("md: unbind<%s>\n", bdevname(rdev->bdev,b)); mddev_destroy_serial_pool(rdev->mddev, rdev, false); 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; bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, shared ? (struct md_rdev *)lock_rdev : rdev); if (IS_ERR(bdev)) { pr_warn("md: could not open device unknown-block(%u,%u).\n", MAJOR(dev), MINOR(dev)); 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; 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]; pr_debug("md: export_rdev(%s)\n", bdevname(rdev->bdev,b)); 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); } void md_kick_rdev_from_array(struct md_rdev *rdev) { unbind_rdev_from_array(rdev); export_rdev(rdev); } EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); static void export_array(struct mddev *mddev) { struct md_rdev *rdev; while (!list_empty(&mddev->disks)) { rdev = list_first_entry(&mddev->disks, struct md_rdev, same_set); md_kick_rdev_from_array(rdev); } mddev->raid_disks = 0; mddev->major_version = 0; } static bool set_in_sync(struct mddev *mddev) { lockdep_assert_held(&mddev->lock); if (!mddev->in_sync) { mddev->sync_checkers++; spin_unlock(&mddev->lock); percpu_ref_switch_to_atomic_sync(&mddev->writes_pending); spin_lock(&mddev->lock); if (!mddev->in_sync && percpu_ref_is_zero(&mddev->writes_pending)) { mddev->in_sync = 1; /* * Ensure ->in_sync is visible before we clear * ->sync_checkers. */ smp_mb(); set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); sysfs_notify_dirent_safe(mddev->sysfs_state); } if (--mddev->sync_checkers == 0) percpu_ref_switch_to_percpu(&mddev->writes_pending); } if (mddev->safemode == 1) mddev->safemode = 0; return mddev->in_sync; } static void sync_sbs(struct mddev *mddev, int nospares) { /* 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 bool does_sb_need_changing(struct mddev *mddev) { struct md_rdev *rdev; struct mdp_superblock_1 *sb; int role; /* Find a good rdev */ rdev_for_each(rdev, mddev) if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) break; /* No good device found. */ if (!rdev) return false; sb = page_address(rdev->sb_page); /* Check if a device has become faulty or a spare become active */ rdev_for_each(rdev, mddev) { role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); /* Device activated? */ if (role == 0xffff && rdev->raid_disk >=0 && !test_bit(Faulty, &rdev->flags)) return true; /* Device turned faulty? */ if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) return true; } /* Check if any mddev parameters have changed */ if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || (mddev->layout != le32_to_cpu(sb->layout)) || (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) return true; return false; } void md_update_sb(struct mddev *mddev, int force_change) { struct md_rdev *rdev; int sync_req; int nospares = 0; int any_badblocks_changed = 0; int ret = -1; if (mddev->ro) { if (force_change) set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); return; } repeat: if (mddev_is_clustered(mddev)) { if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) force_change = 1; if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) nospares = 1; ret = md_cluster_ops->metadata_update_start(mddev); /* Has someone else has updated the sb */ if (!does_sb_need_changing(mddev)) { if (ret == 0) md_cluster_ops->metadata_update_cancel(mddev); bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN)); return; } } /* * First make sure individual recovery_offsets are correct * curr_resync_completed can only be used during recovery. * During reshape/resync it might use array-addresses rather * that device addresses. */ rdev_for_each(rdev, mddev) { if (rdev->raid_disk >= 0 && mddev->delta_disks >= 0 && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) && !test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && !test_bit(Journal, &rdev->flags) && !test_bit(In_sync, &rdev->flags) && mddev->curr_resync_completed > rdev->recovery_offset) rdev->recovery_offset = mddev->curr_resync_completed; } if (!mddev->persistent) { clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); if (!mddev->external) { clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); rdev_for_each(rdev, mddev) { if (rdev->badblocks.changed) { rdev->badblocks.changed = 0; ack_all_badblocks(&rdev->badblocks); md_error(mddev, rdev); } clear_bit(Blocked, &rdev->flags); clear_bit(BlockedBadBlocks, &rdev->flags); wake_up(&rdev->blocked_wait); } } wake_up(&mddev->sb_wait); return; } spin_lock(&mddev->lock); mddev->utime = ktime_get_real_seconds(); if (test_and_clear_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags)) force_change = 1; if (test_and_clear_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags)) /* 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; } /* * 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... */ WARN_ON(mddev->events == 0); rdev_for_each(rdev, mddev) { if (rdev->badblocks.changed) any_badblocks_changed++; if (test_bit(Faulty, &rdev->flags)) set_bit(FaultRecorded, &rdev->flags); } sync_sbs(mddev, nospares); spin_unlock(&mddev->lock); pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", mdname(mddev), mddev->in_sync); if (mddev->queue) blk_add_trace_msg(mddev->queue, "md md_update_sb"); rewrite: md_bitmap_update_sb(mddev->bitmap); rdev_for_each(rdev, mddev) { 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; } if (md_super_wait(mddev) < 0) goto rewrite; /* if there was a failure, MD_SB_CHANGE_DEVS was set, and we re-write super */ if (mddev_is_clustered(mddev) && ret == 0) md_cluster_ops->metadata_update_finish(mddev); if (mddev->in_sync != sync_req || !bit_clear_unless(&mddev->sb_flags, BIT(MD_SB_CHANGE_PENDING), BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_CLEAN))) /* have to write it out again */ goto repeat; 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) ack_all_badblocks(&rdev->badblocks); clear_bit(BlockedBadBlocks, &rdev->flags); wake_up(&rdev->blocked_wait); } } EXPORT_SYMBOL(md_update_sb); static int add_bound_rdev(struct md_rdev *rdev) { struct mddev *mddev = rdev->mddev; int err = 0; bool add_journal = test_bit(Journal, &rdev->flags); if (!mddev->pers->hot_remove_disk || add_journal) { /* 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); if (add_journal) mddev_suspend(mddev); err = mddev->pers->hot_add_disk(mddev, rdev); if (add_journal) mddev_resume(mddev); if (err) { md_kick_rdev_from_array(rdev); return err; } } sysfs_notify_dirent_safe(rdev->sysfs_state); set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); if (mddev->degraded) set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_new_event(mddev); md_wakeup_thread(mddev->thread); return 0; } /* 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; unsigned long flags = READ_ONCE(rdev->flags); if (test_bit(Faulty, &flags) || (!test_bit(ExternalBbl, &flags) && rdev->badblocks.unacked_exist)) len += sprintf(page+len, "faulty%s", sep); if (test_bit(In_sync, &flags)) len += sprintf(page+len, "in_sync%s", sep); if (test_bit(Journal, &flags)) len += sprintf(page+len, "journal%s", sep); if (test_bit(WriteMostly, &flags)) len += sprintf(page+len, "write_mostly%s", sep); if (test_bit(Blocked, &flags) || (rdev->badblocks.unacked_exist && !test_bit(Faulty, &flags))) len += sprintf(page+len, "blocked%s", sep); if (!test_bit(Faulty, &flags) && !test_bit(Journal, &flags) && !test_bit(In_sync, &flags)) len += sprintf(page+len, "spare%s", sep); if (test_bit(WriteErrorSeen, &flags)) len += sprintf(page+len, "write_error%s", sep); if (test_bit(WantReplacement, &flags)) len += sprintf(page+len, "want_replacement%s", sep); if (test_bit(Replacement, &flags)) len += sprintf(page+len, "replacement%s", sep); if (test_bit(ExternalBbl, &flags)) len += sprintf(page+len, "external_bbl%s", sep); if (test_bit(FailFast, &flags)) len += sprintf(page+len, "failfast%s", sep); if (len) len -= strlen(sep); return len+sprintf(page+len, "\n"); } static ssize_t state_store(struct md_rdev *rdev, const char *buf, size_t len) { /* 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 * {,-}failfast - set/clear FailFast */ 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->mddev->pers) { clear_bit(Blocked, &rdev->flags); remove_and_add_spares(rdev->mddev, rdev); } if (rdev->raid_disk >= 0) err = -EBUSY; else { struct mddev *mddev = rdev->mddev; err = 0; if (mddev_is_clustered(mddev)) err = md_cluster_ops->remove_disk(mddev, rdev); if (err == 0) { md_kick_rdev_from_array(rdev); if (mddev->pers) { set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); md_wakeup_thread(mddev->thread); } md_new_event(mddev); } } } else if (cmd_match(buf, "writemostly")) { set_bit(WriteMostly, &rdev->flags); mddev_create_serial_pool(rdev->mddev, rdev, false); err = 0; } else if (cmd_match(buf, "-writemostly")) { mddev_destroy_serial_pool(rdev->mddev, rdev, false); 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) && !test_bit(ExternalBbl, &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, "failfast")) { set_bit(FailFast, &rdev->flags); err = 0; } else if (cmd_match(buf, "-failfast")) { clear_bit(FailFast, &rdev->flags); err = 0; } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags)) { if (rdev->mddev->pers == NULL) { clear_bit(In_sync, &rdev->flags); rdev->saved_raid_disk = rdev->raid_disk; rdev->raid_disk = -1; err = 0; } } else if (cmd_match(buf, "write_error")) { set_bit(WriteErrorSeen, &rdev->flags); err = 0; } else if (cmd_match(buf, "-write_error")) { clear_bit(WriteErrorSeen, &rdev->flags); err = 0; } else if (cmd_match(buf, "want_replacement")) { /* 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(Journal, &rdev->flags) && !test_bit(Replacement, &rdev->flags)) set_bit(WantReplacement, &rdev->flags); set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); md_wakeup_thread(rdev->mddev->thread); err = 0; } else if (cmd_match(buf, "-want_replacement")) { /* 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; } } else if (cmd_match(buf, "re-add")) { if (!rdev->mddev->pers) err = -EINVAL; else if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1) && rdev->saved_raid_disk >= 0) { /* clear_bit is performed _after_ all the devices * have their local Faulty bit cleared. If any writes * happen in the meantime in the local node, they * will land in the local bitmap, which will be synced * by this node eventually */ if (!mddev_is_clustered(rdev->mddev) || (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { clear_bit(Faulty, &rdev->flags); err = add_bound_rdev(rdev); } } else err = -EBUSY; } else if (cmd_match(buf, "external_bbl") && (rdev->mddev->external)) { set_bit(ExternalBbl, &rdev->flags); rdev->badblocks.shift = 0; err = 0; } else if (cmd_match(buf, "-external_bbl") && (rdev->mddev->external)) { clear_bit(ExternalBbl, &rdev->flags); err = 0; } if (!err) sysfs_notify_dirent_safe(rdev->sysfs_state); return err ? err : len; } static struct rdev_sysfs_entry rdev_state = __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); static ssize_t errors_show(struct md_rdev *rdev, char *page) { return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); } static ssize_t errors_store(struct md_rdev *rdev, const char *buf, size_t len) { unsigned int n; int rv; rv = kstrtouint(buf, 10, &n); if (rv < 0) return rv; atomic_set(&rdev->corrected_errors, n); return len; } static struct rdev_sysfs_entry rdev_errors = __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); static ssize_t slot_show(struct md_rdev *rdev, char *page) { if (test_bit(Journal, &rdev->flags)) return sprintf(page, "journal\n"); else if (rdev->raid_disk < 0) return sprintf(page, "none\n"); else return sprintf(page, "%d\n", rdev->raid_disk); } static ssize_t slot_store(struct md_rdev *rdev, const char *buf, size_t len) { int slot; int err; if (test_bit(Journal, &rdev->flags)) return -EBUSY; if (strncmp(buf, "none", 4)==0) slot = -1; else { err = kstrtouint(buf, 10, (unsigned int *)&slot); if (err < 0) return err; } if (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. */ int err; if (rdev->raid_disk != -1) return -EBUSY; if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) return -EBUSY; if (rdev->mddev->pers->hot_add_disk == NULL) return -EINVAL; if (slot >= rdev->mddev->raid_disks && slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) return -ENOSPC; rdev->raid_disk = slot; if (test_bit(In_sync, &rdev->flags)) rdev->saved_raid_disk = slot; else rdev->saved_raid_disk = -1; clear_bit(In_sync, &rdev->flags); clear_bit(Bitmap_sync, &rdev->flags); err = rdev->mddev->pers-> hot_add_disk(rdev->mddev, rdev); if (err) { rdev->raid_disk = -1; return err; } else sysfs_notify_dirent_safe(rdev->sysfs_state); 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 || test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) 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 (test_bit(Journal, &rdev->flags)) return -EBUSY; if (strict_blocks_to_sectors(buf, §ors) < 0) return -EINVAL; if (rdev->data_offset != rdev->new_data_offset) return -EINVAL; /* 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. 'rcu' is sufficient to walk * the rdev lists safely. * This check does not provide a hard guarantee, it * just helps avoid dangerous mistakes. */ struct mddev *mddev; int overlap = 0; struct list_head *tmp; rcu_read_lock(); for_each_mddev(mddev, tmp) { struct md_rdev *rdev2; 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; } if (overlap) { mddev_put(mddev); break; } } rcu_read_unlock(); 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); /* 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 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 ssize_t ppl_sector_show(struct md_rdev *rdev, char *page) { return sprintf(page, "%llu\n", (unsigned long long)rdev->ppl.sector); } static ssize_t ppl_sector_store(struct md_rdev *rdev, const char *buf, size_t len) { unsigned long long sector; if (kstrtoull(buf, 10, §or) < 0) return -EINVAL; if (sector != (sector_t)sector) return -EINVAL; if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && rdev->raid_disk >= 0) return -EBUSY; if (rdev->mddev->persistent) { if (rdev->mddev->major_version == 0) return -EINVAL; if ((sector > rdev->sb_start && sector - rdev->sb_start > S16_MAX) || (sector < rdev->sb_start && rdev->sb_start - sector > -S16_MIN)) return -EINVAL; rdev->ppl.offset = sector - rdev->sb_start; } else if (!rdev->mddev->external) { return -EBUSY; } rdev->ppl.sector = sector; return len; } static struct rdev_sysfs_entry rdev_ppl_sector = __ATTR(ppl_sector, S_IRUGO|S_IWUSR, ppl_sector_show, ppl_sector_store); static ssize_t ppl_size_show(struct md_rdev *rdev, char *page) { return sprintf(page, "%u\n", rdev->ppl.size); } static ssize_t ppl_size_store(struct md_rdev *rdev, const char *buf, size_t len) { unsigned int size; if (kstrtouint(buf, 10, &size) < 0) return -EINVAL; if (rdev->mddev->pers && test_bit(MD_HAS_PPL, &rdev->mddev->flags) && rdev->raid_disk >= 0) return -EBUSY; if (rdev->mddev->persistent) { if (rdev->mddev->major_version == 0) return -EINVAL; if (size > U16_MAX) return -EINVAL; } else if (!rdev->mddev->external) { return -EBUSY; } rdev->ppl.size = size; return len; } static struct rdev_sysfs_entry rdev_ppl_size = __ATTR(ppl_size, S_IRUGO|S_IWUSR, ppl_size_show, ppl_size_store); static struct attribute *rdev_default_attrs[] = { &rdev_state.attr, &rdev_errors.attr, &rdev_slot.attr, &rdev_offset.attr, &rdev_new_offset.attr, &rdev_size.attr, &rdev_recovery_start.attr, &rdev_bad_blocks.attr, &rdev_unack_bad_blocks.attr, &rdev_ppl_sector.attr, &rdev_ppl_size.attr, NULL, }; static ssize_t rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) { struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); if (!entry->show) return -EIO; if (!rdev->mddev) return -ENODEV; return entry->show(rdev, page); } static ssize_t rdev_attr_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); 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) : -ENODEV; if (!rv) { if (rdev->mddev == NULL) rv = -ENODEV; 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 = 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 */ return badblocks_init(&rdev->badblocks, 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) 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) { pr_warn("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) { pr_warn("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) { pr_warn("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 int 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: pr_warn("md: fatal superblock inconsistency in %s -- removing from array\n", bdevname(rdev->bdev,b)); md_kick_rdev_from_array(rdev); } /* Cannot find a valid fresh disk */ if (!freshest) { pr_warn("md: cannot find a valid disk\n"); return -EINVAL; } super_types[mddev->major_version]. validate_super(mddev, freshest); i = 0; rdev_for_each_safe(rdev, tmp, mddev) { if (mddev->max_disks && (rdev->desc_nr >= mddev->max_disks || i > mddev->max_disks)) { pr_warn("md: %s: %s: only %d devices permitted\n", mdname(mddev), bdevname(rdev->bdev, b), mddev->max_disks); md_kick_rdev_from_array(rdev); continue; } if (rdev != freshest) { if (super_types[mddev->major_version]. validate_super(mddev, rdev)) { pr_warn("md: kicking non-fresh %s from array!\n", bdevname(rdev->bdev,b)); md_kick_rdev_from_array(rdev); continue; } } if (mddev->level == LEVEL_MULTIPATH) { rdev->desc_nr = i++; rdev->raid_disk = rdev->desc_nr; set_bit(In_sync, &rdev->flags); } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks)) && !test_bit(Journal, &rdev->flags)) { rdev->raid_disk = -1; clear_bit(In_sync, &rdev->flags); } } return 0; } /* 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; *res = result * int_pow(10, scale - decimals); return 0; } 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 (mddev_is_clustered(mddev)) { pr_warn("md: Safemode is disabled for clustered mode\n"); return -EINVAL; } 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; unsigned long new_delay = (msec*HZ)/1000; if (new_delay == 0) new_delay = 1; mddev->safemode_delay = new_delay; if (new_delay < old_delay || old_delay == 0) mod_timer(&mddev->safemode_timer, jiffies+1); } return len; } static struct md_sysfs_entry md_safe_delay = __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); static ssize_t level_show(struct mddev *mddev, char *page) { struct md_personality *p; int ret; spin_lock(&mddev->lock); p = mddev->pers; if (p) ret = sprintf(page, "%s\n", p->name); else if (mddev->clevel[0]) ret = sprintf(page, "%s\n", mddev->clevel); else if (mddev->level != LEVEL_NONE) ret = sprintf(page, "%d\n", mddev->level); else ret = 0; spin_unlock(&mddev->lock); return ret; } static ssize_t level_store(struct mddev *mddev, const char *buf, size_t len) { char clevel[16]; ssize_t rv; size_t slen = len; struct md_personality *pers, *oldpers; long level; void *priv, *oldpriv; struct md_rdev *rdev; if (slen == 0 || slen >= sizeof(clevel)) return -EINVAL; rv = mddev_lock(mddev); if (rv) return rv; if (mddev->pers == NULL) { strncpy(mddev->clevel, buf, slen); if (mddev->clevel[slen-1] == '\n') slen--; mddev->clevel[slen] = 0; mddev->level = LEVEL_NONE; rv = len; goto out_unlock; } rv = -EROFS; if (mddev->ro) goto out_unlock; /* 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. */ rv = -EBUSY; if (mddev->sync_thread || test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || mddev->reshape_position != MaxSector || mddev->sysfs_active) goto out_unlock; rv = -EINVAL; if (!mddev->pers->quiesce) { pr_warn("md: %s: %s does not support online personality change\n", mdname(mddev), mddev->pers->name); goto out_unlock; } /* Now find the new personality */ strncpy(clevel, buf, slen); if (clevel[slen-1] == '\n') slen--; clevel[slen] = 0; if (kstrtol(clevel, 10, &level)) level = LEVEL_NONE; if (request_module("md-%s", clevel) != 0) request_module("md-level-%s", clevel); spin_lock(&pers_lock); pers = find_pers(level, clevel); if (!pers || !try_module_get(pers->owner)) { spin_unlock(&pers_lock); pr_warn("md: personality %s not loaded\n", clevel); rv = -EINVAL; goto out_unlock; } spin_unlock(&pers_lock); if (pers == mddev->pers) { /* Nothing to do! */ module_put(pers->owner); rv = len; goto out_unlock; } if (!pers->takeover) { module_put(pers->owner); pr_warn("md: %s: %s does not support personality takeover\n", mdname(mddev), clevel); rv = -EINVAL; goto out_unlock; } rdev_for_each(rdev, mddev) rdev->new_raid_disk = rdev->raid_disk; /* ->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); pr_warn("md: %s: %s would not accept array\n", mdname(mddev), clevel); rv = PTR_ERR(priv); goto out_unlock; } /* Looks like we have a winner */ mddev_suspend(mddev); mddev_detach(mddev); spin_lock(&mddev->lock); oldpers = mddev->pers; oldpriv = mddev->private; 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; spin_unlock(&mddev->lock); if (oldpers->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; } oldpers->free(mddev, oldpriv); if (oldpers->sync_request == NULL && pers->sync_request != NULL) { /* need to add the md_redundancy_group */ if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) pr_warn("md: cannot register extra attributes for %s\n", mdname(mddev)); mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); } if (oldpers->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; } module_put(oldpers->owner); rdev_for_each(rdev, mddev) { if (rdev->raid_disk < 0) continue; if (rdev->new_raid_disk >= mddev->raid_disks) rdev->new_raid_disk = -1; if (rdev->new_raid_disk == rdev->raid_disk) continue; sysfs_unlink_rdev(mddev, rdev); } rdev_for_each(rdev, mddev) { if (rdev->raid_disk < 0) continue; if (rdev->new_raid_disk == rdev->raid_disk) continue; rdev->raid_disk = rdev->new_raid_disk; if (rdev->raid_disk < 0) clear_bit(In_sync, &rdev->flags); else { if (sysfs_link_rdev(mddev, rdev)) pr_warn("md: cannot register rd%d for %s after level change\n", rdev->raid_disk, mdname(mddev)); } } if (pers->sync_request == NULL) { /* 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_SB_CHANGE_DEVS, &mddev->sb_flags); mddev_resume(mddev); if (!mddev->thread) md_update_sb(mddev, 1); sysfs_notify(&mddev->kobj, NULL, "level"); md_new_event(mddev); rv = len; out_unlock: mddev_unlock(mddev); return rv; } static struct md_sysfs_entry md_level = __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); static ssize_t layout_show(struct mddev *mddev, char *page) { /* 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) { unsigned int n; int err; err = kstrtouint(buf, 10, &n); if (err < 0) return err; err = mddev_lock(mddev); if (err) return err; if (mddev->pers) { if (mddev->pers->check_reshape == NULL) err = -EBUSY; else if (mddev->ro) err = -EROFS; else { mddev->new_layout = n; err = mddev->pers->check_reshape(mddev); if (err) mddev->new_layout = mddev->layout; } } else { mddev->new_layout = n; if (mddev->reshape_position == MaxSector) mddev->layout = n; } mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_layout = __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); static ssize_t raid_disks_show(struct mddev *mddev, char *page) { if (mddev->raid_disks == 0) return 0; if (mddev->reshape_position != MaxSector && mddev->delta_disks != 0) return sprintf(page, "%d (%d)\n", mddev->raid_disks, mddev->raid_disks - mddev->delta_disks); return sprintf(page, "%d\n", mddev->raid_disks); } static int update_raid_disks(struct mddev *mddev, int raid_disks); static ssize_t raid_disks_store(struct mddev *mddev, const char *buf, size_t len) { unsigned int n; int err; err = kstrtouint(buf, 10, &n); if (err < 0) return err; err = mddev_lock(mddev); if (err) return err; if (mddev->pers) err = update_raid_disks(mddev, n); else if (mddev->reshape_position != MaxSector) { struct md_rdev *rdev; int olddisks = mddev->raid_disks - mddev->delta_disks; err = -EINVAL; rdev_for_each(rdev, mddev) { if (olddisks < n && rdev->data_offset < rdev->new_data_offset) goto out_unlock; if (olddisks > n && rdev->data_offset > rdev->new_data_offset) goto out_unlock; } err = 0; mddev->delta_disks = n - olddisks; mddev->raid_disks = n; mddev->reshape_backwards = (mddev->delta_disks < 0); } else mddev->raid_disks = n; out_unlock: mddev_unlock(mddev); return err ? err : len; } static struct md_sysfs_entry md_raid_disks = __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); static ssize_t chunk_size_show(struct mddev *mddev, char *page) { if (mddev->reshape_position != MaxSector && mddev->chunk_sectors != mddev->new_chunk_sectors) return sprintf(page, "%d (%d)\n", mddev->new_chunk_sectors << 9, mddev->chunk_sectors << 9); return sprintf(page, "%d\n", mddev->chunk_sectors << 9); } static ssize_t chunk_size_store(struct mddev *mddev, const char *buf, size_t len) { unsigned long n; int err; err = kstrtoul(buf, 10, &n); if (err < 0) return err; err = mddev_lock(mddev); if (err) return err; if (mddev->pers) { if (mddev->pers->check_reshape == NULL) err = -EBUSY; else if (mddev->ro) err = -EROFS; else { mddev->new_chunk_sectors = n >> 9; err = mddev->pers->check_reshape(mddev); if (err) mddev->new_chunk_sectors = mddev->chunk_sectors; } } else { mddev->new_chunk_sectors = n >> 9; if (mddev->reshape_position == MaxSector) mddev->chunk_sectors = n >> 9; } mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_chunk_size = __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); static ssize_t resync_start_show(struct mddev *mddev, char *page) { if (mddev->recovery_cp == MaxSector) return sprintf(page, "none\n"); return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); } static ssize_t resync_start_store(struct mddev *mddev, const char *buf, size_t len) { unsigned long long n; int err; if (cmd_match(buf, "none")) n = MaxSector; else { err = kstrtoull(buf, 10, &n); if (err < 0) return err; if (n != (sector_t)n) return -EINVAL; } err = mddev_lock(mddev); if (err) return err; if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) err = -EBUSY; if (!err) { mddev->recovery_cp = n; if (mddev->pers) set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); } mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_resync_start = __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); /* * 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). * * broken * RAID0/LINEAR-only: same as clean, but array is missing a member. * It's useful because RAID0/LINEAR mounted-arrays aren't stopped * when a member is gone, so this state will at least alert the * user that something is wrong. */ enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, write_pending, active_idle, broken, bad_word}; static char *array_states[] = { "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", "write-pending", "active-idle", "broken", NULL }; static int match_word(const char *word, char **list) { int n; for (n=0; list[n]; n++) if (cmd_match(word, list[n])) break; return n; } static ssize_t array_state_show(struct mddev *mddev, char *page) { enum array_state st = inactive; if (mddev->pers && !test_bit(MD_NOT_READY, &mddev->flags)) { switch(mddev->ro) { case 1: st = readonly; break; case 2: st = read_auto; break; case 0: spin_lock(&mddev->lock); if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) st = write_pending; else if (mddev->in_sync) st = clean; else if (mddev->safemode) st = active_idle; else st = active; spin_unlock(&mddev->lock); } if (test_bit(MD_BROKEN, &mddev->flags) && st == clean) st = broken; } else { if (list_empty(&mddev->disks) && mddev->raid_disks == 0 && mddev->dev_sectors == 0) st = clear; else st = inactive; } return sprintf(page, "%s\n", array_states[st]); } static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); static int 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 = 0; enum array_state st = match_word(buf, array_states); if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { /* don't take reconfig_mutex when toggling between * clean and active */ spin_lock(&mddev->lock); if (st == active) { restart_array(mddev); clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); md_wakeup_thread(mddev->thread); wake_up(&mddev->sb_wait); } else /* st == clean */ { restart_array(mddev); if (!set_in_sync(mddev)) err = -EBUSY; } if (!err) sysfs_notify_dirent_safe(mddev->sysfs_state); spin_unlock(&mddev->lock); return err ?: len; } err = mddev_lock(mddev); if (err) return err; err = -EINVAL; switch(st) { case bad_word: break; case clear: /* 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) { err = restart_array(mddev); if (err) break; spin_lock(&mddev->lock); if (!set_in_sync(mddev)) err = -EBUSY; spin_unlock(&mddev->lock); } else err = -EINVAL; break; case active: if (mddev->pers) { err = restart_array(mddev); if (err) break; clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); wake_up(&mddev->sb_wait); err = 0; } else { mddev->ro = 0; set_disk_ro(mddev->gendisk, 0); err = do_md_run(mddev); } break; case write_pending: case active_idle: case broken: /* these cannot be set */ break; } if (!err) { if (mddev->hold_active == UNTIL_IOCTL) mddev->hold_active = 0; sysfs_notify_dirent_safe(mddev->sysfs_state); } mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_array_state = __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); static ssize_t max_corrected_read_errors_show(struct mddev *mddev, char *page) { return sprintf(page, "%d\n", atomic_read(&mddev->max_corr_read_errors)); } static ssize_t max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) { unsigned int n; int rv; rv = kstrtouint(buf, 10, &n); if (rv < 0) return rv; atomic_set(&mddev->max_corr_read_errors, n); return len; } static struct md_sysfs_entry max_corr_read_errors = __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, max_corrected_read_errors_store); static ssize_t null_show(struct mddev *mddev, char *page) { return -EINVAL; } static ssize_t new_dev_store(struct mddev *mddev, const char *buf, size_t len) { /* 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; flush_workqueue(md_misc_wq); err = mddev_lock(mddev); if (err) return err; if (mddev->persistent) { rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { struct md_rdev *rdev0 = list_entry(mddev->disks.next, struct md_rdev, same_set); err = super_types[mddev->major_version] .load_super(rdev, rdev0, mddev->minor_version); if (err < 0) goto out; } } else if (mddev->external) rdev = md_import_device(dev, -2, -1); else rdev = md_import_device(dev, -1, -1); if (IS_ERR(rdev)) { mddev_unlock(mddev); return PTR_ERR(rdev); } err = bind_rdev_to_array(rdev, mddev); out: if (err) export_rdev(rdev); mddev_unlock(mddev); if (!err) md_new_event(mddev); return err ? err : len; } static struct md_sysfs_entry md_new_device = __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); static ssize_t bitmap_store(struct mddev *mddev, const char *buf, size_t len) { char *end; unsigned long chunk, end_chunk; int err; err = mddev_lock(mddev); if (err) return err; if (!mddev->bitmap) goto out; /* 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; md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); buf = skip_spaces(end); } md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ out: mddev_unlock(mddev); return len; } static struct md_sysfs_entry md_bitmap = __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); static ssize_t size_show(struct mddev *mddev, char *page) { return sprintf(page, "%llu\n", (unsigned long long)mddev->dev_sectors / 2); } static int update_size(struct mddev *mddev, sector_t num_sectors); static ssize_t size_store(struct mddev *mddev, const char *buf, size_t len) { /* 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; err = mddev_lock(mddev); if (err) return err; if (mddev->pers) { err = update_size(mddev, sectors); if (err == 0) md_update_sb(mddev, 1); } else { if (mddev->dev_sectors == 0 || mddev->dev_sectors > sectors) mddev->dev_sectors = sectors; else err = -ENOSPC; } mddev_unlock(mddev); return err ? err : len; } static struct md_sysfs_entry md_size = __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); /* 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; int err; /* Changing the details of 'external' metadata is * always permitted. Otherwise there must be * no devices attached to the array. */ err = mddev_lock(mddev); if (err) return err; err = -EBUSY; if (mddev->external && strncmp(buf, "external:", 9) == 0) ; else if (!list_empty(&mddev->disks)) goto out_unlock; err = 0; if (cmd_match(buf, "none")) { mddev->persistent = 0; mddev->external = 0; mddev->major_version = 0; mddev->minor_version = 90; goto out_unlock; } if (strncmp(buf, "external:", 9) == 0) { size_t namelen = len-9; if (namelen >= sizeof(mddev->metadata_type)) namelen = sizeof(mddev->metadata_type)-1; strncpy(mddev->metadata_type, buf+9, namelen); mddev->metadata_type[namelen] = 0; if (namelen && mddev->metadata_type[namelen-1] == '\n') mddev->metadata_type[--namelen] = 0; mddev->persistent = 0; mddev->external = 1; mddev->major_version = 0; mddev->minor_version = 90; goto out_unlock; } major = simple_strtoul(buf, &e, 10); err = -EINVAL; if (e==buf || *e != '.') goto out_unlock; buf = e+1; minor = simple_strtoul(buf, &e, 10); if (e==buf || (*e && *e != '\n') ) goto out_unlock; err = -ENOENT; if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) goto out_unlock; mddev->major_version = major; mddev->minor_version = minor; mddev->persistent = 1; mddev->external = 0; err = 0; out_unlock: mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_metadata = __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); static ssize_t action_show(struct mddev *mddev, char *page) { char *type = "idle"; unsigned long recovery = mddev->recovery; if (test_bit(MD_RECOVERY_FROZEN, &recovery)) type = "frozen"; else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) type = "reshape"; else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) type = "resync"; else if (test_bit(MD_RECOVERY_CHECK, &recovery)) type = "check"; else type = "repair"; } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) type = "recover"; else if (mddev->reshape_position != MaxSector) type = "reshape"; } return sprintf(page, "%s\n", type); } static ssize_t action_store(struct mddev *mddev, const char *page, size_t len) { if (!mddev->pers || !mddev->pers->sync_request) return -EINVAL; if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { if (cmd_match(page, "frozen")) set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); else clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && mddev_lock(mddev) == 0) { flush_workqueue(md_misc_wq); if (mddev->sync_thread) { set_bit(MD_RECOVERY_INTR, &mddev->recovery); md_reap_sync_thread(mddev); } mddev_unlock(mddev); } } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) return -EBUSY; else if (cmd_match(page, "resync")) clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); else if (cmd_match(page, "recover")) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); } else if (cmd_match(page, "reshape")) { int err; if (mddev->pers->start_reshape == NULL) return -EINVAL; err = mddev_lock(mddev); if (!err) { if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) err = -EBUSY; else { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); err = mddev->pers->start_reshape(mddev); } mddev_unlock(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; clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); 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_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); static ssize_t last_sync_action_show(struct mddev *mddev, char *page) { return sprintf(page, "%s\n", mddev->last_sync_action); } static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); static ssize_t mismatch_cnt_show(struct mddev *mddev, char *page) { return sprintf(page, "%llu\n", (unsigned long long) atomic64_read(&mddev->resync_mismatches)); } static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); static ssize_t sync_min_show(struct mddev *mddev, char *page) { return sprintf(page, "%d (%s)\n", speed_min(mddev), mddev->sync_speed_min ? "local": "system"); } static ssize_t sync_min_store(struct mddev *mddev, const char *buf, size_t len) { unsigned int min; int rv; if (strncmp(buf, "system", 6)==0) { min = 0; } else { rv = kstrtouint(buf, 10, &min); if (rv < 0) return rv; if (min == 0) return -EINVAL; } mddev->sync_speed_min = min; return len; } static struct md_sysfs_entry md_sync_min = __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); static ssize_t sync_max_show(struct mddev *mddev, char *page) { return sprintf(page, "%d (%s)\n", speed_max(mddev), mddev->sync_speed_max ? "local": "system"); } static ssize_t sync_max_store(struct mddev *mddev, const char *buf, size_t len) { unsigned int max; int rv; if (strncmp(buf, "system", 6)==0) { max = 0; } else { rv = kstrtouint(buf, 10, &max); if (rv < 0) return rv; if (max == 0) return -EINVAL; } mddev->sync_speed_max = max; return len; } static struct md_sysfs_entry md_sync_max = __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); static ssize_t degraded_show(struct mddev *mddev, char *page) { return sprintf(page, "%d\n", mddev->degraded); } static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); static ssize_t sync_force_parallel_show(struct mddev *mddev, char *page) { return sprintf(page, "%d\n", mddev->parallel_resync); } static ssize_t sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) { long n; if (kstrtol(buf, 10, &n)) return -EINVAL; if (n != 0 && n != 1) return -EINVAL; mddev->parallel_resync = n; if (mddev->sync_thread) wake_up(&resync_wait); return len; } /* 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_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); static ssize_t min_sync_show(struct mddev *mddev, char *page) { return sprintf(page, "%llu\n", (unsigned long long)mddev->resync_min); } static ssize_t min_sync_store(struct mddev *mddev, const char *buf, size_t len) { unsigned long long min; int err; if (kstrtoull(buf, 10, &min)) return -EINVAL; spin_lock(&mddev->lock); err = -EINVAL; if (min > mddev->resync_max) goto out_unlock; err = -EBUSY; if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) goto out_unlock; /* Round down to multiple of 4K for safety */ mddev->resync_min = round_down(min, 8); err = 0; out_unlock: spin_unlock(&mddev->lock); return err ?: len; } static struct md_sysfs_entry md_min_sync = __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); static ssize_t max_sync_show(struct mddev *mddev, char *page) { if (mddev->resync_max == MaxSector) return sprintf(page, "max\n"); else return sprintf(page, "%llu\n", (unsigned long long)mddev->resync_max); } static ssize_t max_sync_store(struct mddev *mddev, const char *buf, size_t len) { int err; spin_lock(&mddev->lock); if (strncmp(buf, "max", 3) == 0) mddev->resync_max = MaxSector; else { unsigned long long max; int chunk; err = -EINVAL; if (kstrtoull(buf, 10, &max)) goto out_unlock; if (max < mddev->resync_min) goto out_unlock; err = -EBUSY; if (max < mddev->resync_max && mddev->ro == 0 && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) goto out_unlock; /* Must be a multiple of chunk_size */ chunk = mddev->chunk_sectors; if (chunk) { sector_t temp = max; err = -EINVAL; if (sector_div(temp, chunk)) goto out_unlock; } mddev->resync_max = max; } wake_up(&mddev->recovery_wait); err = 0; out_unlock: spin_unlock(&mddev->lock); return err ?: len; } static struct md_sysfs_entry md_max_sync = __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); static ssize_t suspend_lo_show(struct mddev *mddev, char *page) { return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); } static ssize_t suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) { unsigned long long new; int err; err = kstrtoull(buf, 10, &new); if (err < 0) return err; if (new != (sector_t)new) return -EINVAL; err = mddev_lock(mddev); if (err) return err; err = -EINVAL; if (mddev->pers == NULL || mddev->pers->quiesce == NULL) goto unlock; mddev_suspend(mddev); mddev->suspend_lo = new; mddev_resume(mddev); err = 0; unlock: mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_suspend_lo = __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); static ssize_t suspend_hi_show(struct mddev *mddev, char *page) { return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); } static ssize_t suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) { unsigned long long new; int err; err = kstrtoull(buf, 10, &new); if (err < 0) return err; if (new != (sector_t)new) return -EINVAL; err = mddev_lock(mddev); if (err) return err; err = -EINVAL; if (mddev->pers == NULL) goto unlock; mddev_suspend(mddev); mddev->suspend_hi = new; mddev_resume(mddev); err = 0; unlock: mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_suspend_hi = __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); static ssize_t reshape_position_show(struct mddev *mddev, char *page) { if (mddev->reshape_position != MaxSector) return sprintf(page, "%llu\n", (unsigned long long)mddev->reshape_position); strcpy(page, "none\n"); return 5; } static ssize_t reshape_position_store(struct mddev *mddev, const char *buf, size_t len) { struct md_rdev *rdev; unsigned long long new; int err; err = kstrtoull(buf, 10, &new); if (err < 0) return err; if (new != (sector_t)new) return -EINVAL; err = mddev_lock(mddev); if (err) return err; err = -EBUSY; if (mddev->pers) goto unlock; mddev->reshape_position = new; mddev->delta_disks = 0; mddev->reshape_backwards = 0; mddev->new_level = mddev->level; mddev->new_layout = mddev->layout; mddev->new_chunk_sectors = mddev->chunk_sectors; rdev_for_each(rdev, mddev) rdev->new_data_offset = rdev->data_offset; err = 0; unlock: mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_reshape_position = __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, reshape_position_store); static ssize_t reshape_direction_show(struct mddev *mddev, char *page) { return sprintf(page, "%s\n", mddev->reshape_backwards ? "backwards" : "forwards"); } static ssize_t reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) { int backwards = 0; int err; if (cmd_match(buf, "forwards")) backwards = 0; else if (cmd_match(buf, "backwards")) backwards = 1; else return -EINVAL; if (mddev->reshape_backwards == backwards) return len; err = mddev_lock(mddev); if (err) return err; /* check if we are allowed to change */ if (mddev->delta_disks) err = -EBUSY; else if (mddev->persistent && mddev->major_version == 0) err = -EINVAL; else mddev->reshape_backwards = backwards; mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_reshape_direction = __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, reshape_direction_store); static ssize_t array_size_show(struct mddev *mddev, char *page) { if (mddev->external_size) return sprintf(page, "%llu\n", (unsigned long long)mddev->array_sectors/2); else return sprintf(page, "default\n"); } static ssize_t array_size_store(struct mddev *mddev, const char *buf, size_t len) { sector_t sectors; int err; err = mddev_lock(mddev); if (err) return err; /* cluster raid doesn't support change array_sectors */ if (mddev_is_clustered(mddev)) { mddev_unlock(mddev); return -EINVAL; } if (strncmp(buf, "default", 7) == 0) { if (mddev->pers) sectors = mddev->pers->size(mddev, 0, 0); else sectors = mddev->array_sectors; mddev->external_size = 0; } else { if (strict_blocks_to_sectors(buf, §ors) < 0) err = -EINVAL; else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) err = -E2BIG; else mddev->external_size = 1; } if (!err) { mddev->array_sectors = sectors; if (mddev->pers) { set_capacity(mddev->gendisk, mddev->array_sectors); revalidate_disk(mddev->gendisk); } } mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_array_size = __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, array_size_store); static ssize_t consistency_policy_show(struct mddev *mddev, char *page) { int ret; if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { ret = sprintf(page, "journal\n"); } else if (test_bit(MD_HAS_PPL, &mddev->flags)) { ret = sprintf(page, "ppl\n"); } else if (mddev->bitmap) { ret = sprintf(page, "bitmap\n"); } else if (mddev->pers) { if (mddev->pers->sync_request) ret = sprintf(page, "resync\n"); else ret = sprintf(page, "none\n"); } else { ret = sprintf(page, "unknown\n"); } return ret; } static ssize_t consistency_policy_store(struct mddev *mddev, const char *buf, size_t len) { int err = 0; if (mddev->pers) { if (mddev->pers->change_consistency_policy) err = mddev->pers->change_consistency_policy(mddev, buf); else err = -EBUSY; } else if (mddev->external && strncmp(buf, "ppl", 3) == 0) { set_bit(MD_HAS_PPL, &mddev->flags); } else { err = -EINVAL; } return err ? err : len; } static struct md_sysfs_entry md_consistency_policy = __ATTR(consistency_policy, S_IRUGO | S_IWUSR, consistency_policy_show, consistency_policy_store); static ssize_t fail_last_dev_show(struct mddev *mddev, char *page) { return sprintf(page, "%d\n", mddev->fail_last_dev); } /* * Setting fail_last_dev to true to allow last device to be forcibly removed * from RAID1/RAID10. */ static ssize_t fail_last_dev_store(struct mddev *mddev, const char *buf, size_t len) { int ret; bool value; ret = kstrtobool(buf, &value); if (ret) return ret; if (value != mddev->fail_last_dev) mddev->fail_last_dev = value; return len; } static struct md_sysfs_entry md_fail_last_dev = __ATTR(fail_last_dev, S_IRUGO | S_IWUSR, fail_last_dev_show, fail_last_dev_store); static ssize_t serialize_policy_show(struct mddev *mddev, char *page) { if (mddev->pers == NULL || (mddev->pers->level != 1)) return sprintf(page, "n/a\n"); else return sprintf(page, "%d\n", mddev->serialize_policy); } /* * Setting serialize_policy to true to enforce write IO is not reordered * for raid1. */ static ssize_t serialize_policy_store(struct mddev *mddev, const char *buf, size_t len) { int err; bool value; err = kstrtobool(buf, &value); if (err) return err; if (value == mddev->serialize_policy) return len; err = mddev_lock(mddev); if (err) return err; if (mddev->pers == NULL || (mddev->pers->level != 1)) { pr_err("md: serialize_policy is only effective for raid1\n"); err = -EINVAL; goto unlock; } mddev_suspend(mddev); if (value) mddev_create_serial_pool(mddev, NULL, true); else mddev_destroy_serial_pool(mddev, NULL, true); mddev->serialize_policy = value; mddev_resume(mddev); unlock: mddev_unlock(mddev); return err ?: len; } static struct md_sysfs_entry md_serialize_policy = __ATTR(serialize_policy, S_IRUGO | S_IWUSR, serialize_policy_show, serialize_policy_store); static struct attribute *md_default_attrs[] = { &md_level.attr, &md_layout.attr, &md_raid_disks.attr, &md_chunk_size.attr, &md_size.attr, &md_resync_start.attr, &md_metadata.attr, &md_new_device.attr, &md_safe_delay.attr, &md_array_state.attr, &md_reshape_position.attr, &md_reshape_direction.attr, &md_array_size.attr, &max_corr_read_errors.attr, &md_consistency_policy.attr, &md_fail_last_dev.attr, &md_serialize_policy.attr, NULL, }; static 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 = entry->show(mddev, page); mddev_put(mddev); return rv; } static ssize_t md_attr_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); struct mddev *mddev = container_of(kobj, struct mddev, kobj); ssize_t rv; if (!entry->store) return -EIO; if (!capable(CAP_SYS_ADMIN)) return -EACCES; spin_lock(&all_mddevs_lock); if (list_empty(&mddev->all_mddevs)) { spin_unlock(&all_mddevs_lock); return -EBUSY; } mddev_get(mddev); spin_unlock(&all_mddevs_lock); rv = entry->store(mddev, page, length); 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); if (mddev->queue) blk_cleanup_queue(mddev->queue); if (mddev->gendisk) put_disk(mddev->gendisk); percpu_ref_exit(&mddev->writes_pending); bioset_exit(&mddev->bio_set); bioset_exit(&mddev->sync_set); 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 void no_op(struct percpu_ref *r) {} int mddev_init_writes_pending(struct mddev *mddev) { if (mddev->writes_pending.percpu_count_ptr) return 0; if (percpu_ref_init(&mddev->writes_pending, no_op, PERCPU_REF_ALLOW_REINIT, GFP_KERNEL) < 0) return -ENOMEM; /* We want to start with the refcount at zero */ percpu_ref_put(&mddev->writes_pending); return 0; } EXPORT_SYMBOL_GPL(mddev_init_writes_pending); static int md_alloc(dev_t dev, char *name) { /* * If dev is zero, name is the name of a device to allocate with * an arbitrary minor number. It will be "md_???" * If dev is non-zero it must be a device number with a MAJOR of * MD_MAJOR or mdp_major. In this case, if "name" is NULL, then * the device is being created by opening a node in /dev. * If "name" is not NULL, the device is being created by * writing to /sys/module/md_mod/parameters/new_array. */ 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 && !dev) { /* 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); } if (name && dev) /* * Creating /dev/mdNNN via "newarray", so adjust hold_active. */ mddev->hold_active = UNTIL_STOP; error = -ENOMEM; mddev->queue = blk_alloc_queue(md_make_request, NUMA_NO_NODE); if (!mddev->queue) goto abort; mddev->queue->queuedata = mddev; 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_write_cache(mddev->queue, true, true); /* 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_add(&mddev->kobj, &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 */ pr_debug("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)) pr_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) { if (create_on_open) md_alloc(dev, NULL); return NULL; } static int add_named_array(const char *val, const struct kernel_param *kp) { /* * val must be "md_*" or "mdNNN". * For "md_*" we allocate an array with a large free minor number, and * set the name to val. val must not already be an active name. * For "mdNNN" we allocate an array with the minor number NNN * which must not already be in use. */ int len = strlen(val); char buf[DISK_NAME_LEN]; unsigned long devnum; while (len && val[len-1] == '\n') len--; if (len >= DISK_NAME_LEN) return -E2BIG; strlcpy(buf, val, len+1); if (strncmp(buf, "md_", 3) == 0) return md_alloc(0, buf); if (strncmp(buf, "md", 2) == 0 && isdigit(buf[2]) && kstrtoul(buf+2, 10, &devnum) == 0 && devnum <= MINORMASK) return md_alloc(MKDEV(MD_MAJOR, devnum), NULL); return -EINVAL; } static void md_safemode_timeout(struct timer_list *t) { struct mddev *mddev = from_timer(mddev, t, safemode_timer); mddev->safemode = 1; if (mddev->external) sysfs_notify_dirent_safe(mddev->sysfs_state); md_wakeup_thread(mddev->thread); } static int start_dirty_degraded; 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; err = analyze_sbs(mddev); if (err) return -EINVAL; } if (mddev->level != LEVEL_NONE) request_module("md-level-%d", mddev->level); else if (mddev->clevel[0]) request_module("md-%s", mddev->clevel); /* * Drop all container device buffers, from now on * the only valid external interface is through the md * device. */ mddev->has_superblocks = false; rdev_for_each(rdev, mddev) { if (test_bit(Faulty, &rdev->flags)) continue; sync_blockdev(rdev->bdev); invalidate_bdev(rdev->bdev); if (mddev->ro != 1 && (bdev_read_only(rdev->bdev) || bdev_read_only(rdev->meta_bdev))) { mddev->ro = 1; if (mddev->gendisk) set_disk_ro(mddev->gendisk, 1); } if (rdev->sb_page) mddev->has_superblocks = true; /* 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) { pr_warn("md: %s: data overlaps metadata\n", mdname(mddev)); return -EINVAL; } } else { if (rdev->sb_start + rdev->sb_size/512 > rdev->data_offset) { pr_warn("md: %s: metadata overlaps data\n", mdname(mddev)); return -EINVAL; } } sysfs_notify_dirent_safe(rdev->sysfs_state); } if (!bioset_initialized(&mddev->bio_set)) { err = bioset_init(&mddev->bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); if (err) return err; } if (!bioset_initialized(&mddev->sync_set)) { err = bioset_init(&mddev->sync_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS); if (err) return err; } spin_lock(&pers_lock); pers = find_pers(mddev->level, mddev->clevel); if (!pers || !try_module_get(pers->owner)) { spin_unlock(&pers_lock); if (mddev->level != LEVEL_NONE) pr_warn("md: personality for level %d is not loaded!\n", mddev->level); else pr_warn("md: personality for level %s is not loaded!\n", mddev->clevel); err = -EINVAL; goto abort; } spin_unlock(&pers_lock); if (mddev->level != pers->level) { mddev->level = pers->level; mddev->new_level = pers->level; } strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); if (mddev->reshape_position != MaxSector && pers->start_reshape == NULL) { /* This personality cannot handle reshaping... */ module_put(pers->owner); err = -EINVAL; goto abort; } 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) { pr_warn("%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) pr_warn("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 = pers->run(mddev); if (err) pr_warn("md: pers->run() failed ...\n"); else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { WARN_ONCE(!mddev->external_size, "%s: default size too small, but 'external_size' not in effect?\n", __func__); pr_warn("md: invalid array_size %llu > default size %llu\n", (unsigned long long)mddev->array_sectors / 2, (unsigned long long)pers->size(mddev, 0, 0) / 2); err = -EINVAL; } if (err == 0 && pers->sync_request && (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { struct bitmap *bitmap; bitmap = md_bitmap_create(mddev, -1); if (IS_ERR(bitmap)) { err = PTR_ERR(bitmap); pr_warn("%s: failed to create bitmap (%d)\n", mdname(mddev), err); } else mddev->bitmap = bitmap; } if (err) goto bitmap_abort; if (mddev->bitmap_info.max_write_behind > 0) { bool create_pool = false; rdev_for_each(rdev, mddev) { if (test_bit(WriteMostly, &rdev->flags) && rdev_init_serial(rdev)) create_pool = true; } if (create_pool && mddev->serial_info_pool == NULL) { mddev->serial_info_pool = mempool_create_kmalloc_pool(NR_SERIAL_INFOS, sizeof(struct serial_info)); if (!mddev->serial_info_pool) { err = -ENOMEM; goto bitmap_abort; } } } if (mddev->queue) { bool nonrot = true; rdev_for_each(rdev, mddev) { if (rdev->raid_disk >= 0 && !blk_queue_nonrot(bdev_get_queue(rdev->bdev))) { nonrot = false; break; } } if (mddev->degraded) nonrot = false; if (nonrot) blk_queue_flag_set(QUEUE_FLAG_NONROT, mddev->queue); else blk_queue_flag_clear(QUEUE_FLAG_NONROT, mddev->queue); mddev->queue->backing_dev_info->congested_data = mddev; mddev->queue->backing_dev_info->congested_fn = md_congested; } if (pers->sync_request) { if (mddev->kobj.sd && sysfs_create_group(&mddev->kobj, &md_redundancy_group)) pr_warn("md: cannot register extra attributes for %s\n", mdname(mddev)); mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); } else if (mddev->ro == 2) /* auto-readonly not meaningful */ mddev->ro = 0; atomic_set(&mddev->max_corr_read_errors, MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); mddev->safemode = 0; if (mddev_is_clustered(mddev)) mddev->safemode_delay = 0; else mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ mddev->in_sync = 1; smp_wmb(); spin_lock(&mddev->lock); mddev->pers = pers; spin_unlock(&mddev->lock); rdev_for_each(rdev, mddev) if (rdev->raid_disk >= 0) sysfs_link_rdev(mddev, rdev); /* failure here is OK */ if (mddev->degraded && !mddev->ro) /* This ensures that recovering status is reported immediately * via sysfs - until a lack of spares is confirmed. */ set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); if (mddev->sb_flags) md_update_sb(mddev, 0); md_new_event(mddev); return 0; bitmap_abort: mddev_detach(mddev); if (mddev->private) pers->free(mddev, mddev->private); mddev->private = NULL; module_put(pers->owner); md_bitmap_destroy(mddev); abort: bioset_exit(&mddev->bio_set); bioset_exit(&mddev->sync_set); return err; } EXPORT_SYMBOL_GPL(md_run); static int do_md_run(struct mddev *mddev) { int err; set_bit(MD_NOT_READY, &mddev->flags); err = md_run(mddev); if (err) goto out; err = md_bitmap_load(mddev); if (err) { md_bitmap_destroy(mddev); goto out; } if (mddev_is_clustered(mddev)) md_allow_write(mddev); /* run start up tasks that require md_thread */ md_start(mddev); md_wakeup_thread(mddev->thread); md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ set_capacity(mddev->gendisk, mddev->array_sectors); revalidate_disk(mddev->gendisk); clear_bit(MD_NOT_READY, &mddev->flags); mddev->changed = 1; kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); sysfs_notify_dirent_safe(mddev->sysfs_state); sysfs_notify_dirent_safe(mddev->sysfs_action); sysfs_notify(&mddev->kobj, NULL, "degraded"); out: clear_bit(MD_NOT_READY, &mddev->flags); return err; } int md_start(struct mddev *mddev) { int ret = 0; if (mddev->pers->start) { set_bit(MD_RECOVERY_WAIT, &mddev->recovery); md_wakeup_thread(mddev->thread); ret = mddev->pers->start(mddev); clear_bit(MD_RECOVERY_WAIT, &mddev->recovery); md_wakeup_thread(mddev->sync_thread); } return ret; } EXPORT_SYMBOL_GPL(md_start); static int restart_array(struct mddev *mddev) { struct gendisk *disk = mddev->gendisk; struct md_rdev *rdev; bool has_journal = false; bool has_readonly = false; /* Complain if it has no devices */ if (list_empty(&mddev->disks)) return -ENXIO; if (!mddev->pers) return -EINVAL; if (!mddev->ro) return -EBUSY; rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) { if (test_bit(Journal, &rdev->flags) && !test_bit(Faulty, &rdev->flags)) has_journal = true; if (bdev_read_only(rdev->bdev)) has_readonly = true; } rcu_read_unlock(); if (test_bit(MD_HAS_JOURNAL, &mddev->flags) && !has_journal) /* Don't restart rw with journal missing/faulty */ return -EINVAL; if (has_readonly) return -EROFS; mddev->safemode = 0; mddev->ro = 0; set_disk_ro(disk, 0); pr_debug("md: %s switched to read-write mode.\n", mdname(mddev)); /* Kick recovery or resync if necessary */ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_wakeup_thread(mddev->thread); md_wakeup_thread(mddev->sync_thread); sysfs_notify_dirent_safe(mddev->sysfs_state); return 0; } 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->sb_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->private = NULL; mddev->cluster_info = NULL; 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; mddev->bitmap_info.nodes = 0; } static void __md_stop_writes(struct mddev *mddev) { set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); flush_workqueue(md_misc_wq); if (mddev->sync_thread) { set_bit(MD_RECOVERY_INTR, &mddev->recovery); md_reap_sync_thread(mddev); } del_timer_sync(&mddev->safemode_timer); if (mddev->pers && mddev->pers->quiesce) { mddev->pers->quiesce(mddev, 1); mddev->pers->quiesce(mddev, 0); } md_bitmap_flush(mddev); if (mddev->ro == 0 && ((!mddev->in_sync && !mddev_is_clustered(mddev)) || mddev->sb_flags)) { /* mark array as shutdown cleanly */ if (!mddev_is_clustered(mddev)) mddev->in_sync = 1; md_update_sb(mddev, 1); } /* disable policy to guarantee rdevs free resources for serialization */ mddev->serialize_policy = 0; mddev_destroy_serial_pool(mddev, NULL, true); } 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 mddev_detach(struct mddev *mddev) { md_bitmap_wait_behind_writes(mddev); if (mddev->pers && mddev->pers->quiesce && !mddev->suspended) { mddev->pers->quiesce(mddev, 1); mddev->pers->quiesce(mddev, 0); } md_unregister_thread(&mddev->thread); if (mddev->queue) blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ } static void __md_stop(struct mddev *mddev) { struct md_personality *pers = mddev->pers; md_bitmap_destroy(mddev); mddev_detach(mddev); /* Ensure ->event_work is done */ flush_workqueue(md_misc_wq); spin_lock(&mddev->lock); mddev->pers = NULL; spin_unlock(&mddev->lock); pers->free(mddev, mddev->private); mddev->private = NULL; if (pers->sync_request && mddev->to_remove == NULL) mddev->to_remove = &md_redundancy_group; module_put(pers->owner); 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); bioset_exit(&mddev->bio_set); bioset_exit(&mddev->sync_set); } EXPORT_SYMBOL_GPL(md_stop); static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) { 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 (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) set_bit(MD_RECOVERY_INTR, &mddev->recovery); if (mddev->sync_thread) /* Thread might be blocked waiting for metadata update * which will now never happen */ wake_up_process(mddev->sync_thread->tsk); if (mddev->external && test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) return -EBUSY; mddev_unlock(mddev); wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)); wait_event(mddev->sb_wait, !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); mddev_lock_nointr(mddev); mutex_lock(&mddev->open_mutex); if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || mddev->sync_thread || test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { pr_warn("md: %s still in use.\n",mdname(mddev)); if (did_freeze) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_wakeup_thread(mddev->thread); } err = -EBUSY; goto out; } if (mddev->pers) { __md_stop_writes(mddev); 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 (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) set_bit(MD_RECOVERY_INTR, &mddev->recovery); if (mddev->sync_thread) /* Thread might be blocked waiting for metadata update * which will now never happen */ wake_up_process(mddev->sync_thread->tsk); mddev_unlock(mddev); wait_event(resync_wait, (mddev->sync_thread == NULL && !test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))); mddev_lock_nointr(mddev); mutex_lock(&mddev->open_mutex); if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || mddev->sysfs_active || mddev->sync_thread || test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) { pr_warn("md: %s still in use.\n",mdname(mddev)); mutex_unlock(&mddev->open_mutex); if (did_freeze) { clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_wakeup_thread(mddev->thread); } return -EBUSY; } if (mddev->pers) { if (mddev->ro) set_disk_ro(disk, 0); __md_stop_writes(mddev); __md_stop(mddev); 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) { pr_info("md: %s stopped.\n", mdname(mddev)); if (mddev->bitmap_info.file) { struct file *f = mddev->bitmap_info.file; spin_lock(&mddev->lock); mddev->bitmap_info.file = NULL; spin_unlock(&mddev->lock); fput(f); } mddev->bitmap_info.offset = 0; export_array(mddev); md_clean(mddev); if (mddev->hold_active == UNTIL_STOP) mddev->hold_active = 0; } 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; pr_info("md: running: "); rdev_for_each(rdev, mddev) { char b[BDEVNAME_SIZE]; pr_cont("<%s>", bdevname(rdev->bdev,b)); } pr_cont("\n"); err = do_md_run(mddev); if (err) { pr_warn("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]; pr_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); pr_debug("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) { pr_debug("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) { pr_warn("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); break; } if (mddev_lock(mddev)) pr_warn("md: %s locked, cannot run\n", mdname(mddev)); else if (mddev->raid_disks || mddev->major_version || !list_empty(&mddev->disks)) { pr_warn("md: %s already running, cannot run %s\n", mdname(mddev), bdevname(rdev0->bdev,b)); mddev_unlock(mddev); } else { pr_debug("md: created %s\n", mdname(mddev)); mddev->persistent = 1; rdev_for_each_list(rdev, tmp, &candidates) { list_del_init(&rdev->same_set); if (bind_rdev_to_array(rdev, mddev)) export_rdev(rdev); } 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); } pr_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 if (test_bit(Journal, &rdev->flags)) /* TODO: add journal count to md_u.h */ ; 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 = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); 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 = clamp_t(time64_t, mddev->utime, 0, U32_MAX); 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); if (mddev_is_clustered(mddev)) info.state |= (1<<MD_SB_CLUSTERED); 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; int err; file = kzalloc(sizeof(*file), GFP_NOIO); if (!file) return -ENOMEM; err = 0; spin_lock(&mddev->lock); /* bitmap enabled */ if (mddev->bitmap_info.file) { ptr = file_path(mddev->bitmap_info.file, file->pathname, sizeof(file->pathname)); if (IS_ERR(ptr)) err = PTR_ERR(ptr); else memmove(file->pathname, ptr, sizeof(file->pathname)-(ptr-file->pathname)); } spin_unlock(&mddev->lock); if (err == 0 && copy_to_user(arg, file, sizeof(*file))) err = -EFAULT; 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 = md_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(Journal, &rdev->flags)) info.state |= (1<<MD_DISK_JOURNAL); if (test_bit(WriteMostly, &rdev->flags)) info.state |= (1<<MD_DISK_WRITEMOSTLY); if (test_bit(FailFast, &rdev->flags)) info.state |= (1<<MD_DISK_FAILFAST); } 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 (mddev_is_clustered(mddev) && !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { pr_warn("%s: Cannot add to clustered mddev.\n", mdname(mddev)); return -EINVAL; } 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)) { pr_warn("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) { pr_warn("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) { pr_warn("%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)) { pr_warn("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); if (info->state & (1<<MD_DISK_FAILFAST)) set_bit(FailFast, &rdev->flags); else clear_bit(FailFast, &rdev->flags); if (info->state & (1<<MD_DISK_JOURNAL)) { struct md_rdev *rdev2; bool has_journal = false; /* make sure no existing journal disk */ rdev_for_each(rdev2, mddev) { if (test_bit(Journal, &rdev2->flags)) { has_journal = true; break; } } if (has_journal || mddev->bitmap) { export_rdev(rdev); return -EBUSY; } set_bit(Journal, &rdev->flags); } /* * check whether the device shows up in other nodes */ if (mddev_is_clustered(mddev)) { if (info->state & (1 << MD_DISK_CANDIDATE)) set_bit(Candidate, &rdev->flags); else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { /* --add initiated by this node */ err = md_cluster_ops->add_new_disk(mddev, rdev); if (err) { export_rdev(rdev); return err; } } } rdev->raid_disk = -1; err = bind_rdev_to_array(rdev, mddev); if (err) export_rdev(rdev); if (mddev_is_clustered(mddev)) { if (info->state & (1 << MD_DISK_CANDIDATE)) { if (!err) { err = md_cluster_ops->new_disk_ack(mddev, err == 0); if (err) md_kick_rdev_from_array(rdev); } } else { if (err) md_cluster_ops->add_new_disk_cancel(mddev); else err = add_bound_rdev(rdev); } } else if (!err) err = add_bound_rdev(rdev); return err; } /* otherwise, add_new_disk is only allowed * for major_version==0 superblocks */ if (mddev->major_version != 0) { pr_warn("%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)) { pr_warn("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 (info->state & (1<<MD_DISK_FAILFAST)) set_bit(FailFast, &rdev->flags); if (!mddev->persistent) { pr_debug("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; if (!mddev->pers) return -ENODEV; rdev = find_rdev(mddev, dev); if (!rdev) return -ENXIO; if (rdev->raid_disk < 0) goto kick_rdev; clear_bit(Blocked, &rdev->flags); remove_and_add_spares(mddev, rdev); if (rdev->raid_disk >= 0) goto busy; kick_rdev: if (mddev_is_clustered(mddev)) md_cluster_ops->remove_disk(mddev, rdev); md_kick_rdev_from_array(rdev); set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); if (mddev->thread) md_wakeup_thread(mddev->thread); else md_update_sb(mddev, 1); md_new_event(mddev); return 0; busy: pr_debug("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) { pr_warn("%s: HOT_ADD may only be used with version-0 superblocks.\n", mdname(mddev)); return -EINVAL; } if (!mddev->pers->hot_add_disk) { pr_warn("%s: personality does not support diskops!\n", mdname(mddev)); return -EINVAL; } rdev = md_import_device(dev, -1, 0); if (IS_ERR(rdev)) { pr_warn("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)) { pr_warn("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; set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); if (!mddev->thread) 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 = 0; if (mddev->pers) { if (!mddev->pers->quiesce || !mddev->thread) return -EBUSY; if (mddev->recovery || mddev->sync_thread) return -EBUSY; /* we should be able to change the bitmap.. */ } if (fd >= 0) { struct inode *inode; struct file *f; if (mddev->bitmap || mddev->bitmap_info.file) return -EEXIST; /* cannot add when bitmap is present */ f = fget(fd); if (f == NULL) { pr_warn("%s: error: failed to get bitmap file\n", mdname(mddev)); return -EBADF; } inode = f->f_mapping->host; if (!S_ISREG(inode->i_mode)) { pr_warn("%s: error: bitmap file must be a regular file\n", mdname(mddev)); err = -EBADF; } else if (!(f->f_mode & FMODE_WRITE)) { pr_warn("%s: error: bitmap file must open for write\n", mdname(mddev)); err = -EBADF; } else if (atomic_read(&inode->i_writecount) != 1) { pr_warn("%s: error: bitmap file is already in use\n", mdname(mddev)); err = -EBUSY; } if (err) { fput(f); return err; } mddev->bitmap_info.file = f; 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) { if (fd >= 0) { struct bitmap *bitmap; bitmap = md_bitmap_create(mddev, -1); mddev_suspend(mddev); if (!IS_ERR(bitmap)) { mddev->bitmap = bitmap; err = md_bitmap_load(mddev); } else err = PTR_ERR(bitmap); if (err) { md_bitmap_destroy(mddev); fd = -1; } mddev_resume(mddev); } else if (fd < 0) { mddev_suspend(mddev); md_bitmap_destroy(mddev); mddev_resume(mddev); } } if (fd < 0) { struct file *f = mddev->bitmap_info.file; if (f) { spin_lock(&mddev->lock); mddev->bitmap_info.file = NULL; spin_unlock(&mddev->lock); fput(f); } } 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? */ pr_warn("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 = ktime_get_real_seconds(); return 0; } mddev->major_version = MD_MAJOR_VERSION; mddev->minor_version = MD_MINOR_VERSION; mddev->patch_version = MD_PATCHLEVEL_VERSION; mddev->ctime = ktime_get_real_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; if (mddev->level == 0) /* Cannot trust RAID0 layout info here */ mddev->layout = -1; mddev->chunk_sectors = info->chunk_size >> 9; if (mddev->persistent) { mddev->max_disks = MD_SB_DISKS; mddev->flags = 0; mddev->sb_flags = 0; } set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_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) { lockdep_assert_held(&mddev->reconfig_mutex); 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); sector_t old_dev_sectors = mddev->dev_sectors; 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 (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || mddev->sync_thread) return -EBUSY; if (mddev->ro) return -EROFS; 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) { if (mddev_is_clustered(mddev)) md_cluster_ops->update_size(mddev, old_dev_sectors); else if (mddev->queue) { set_capacity(mddev->gendisk, mddev->array_sectors); 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 (mddev->ro) return -EROFS; if (raid_disks <= 0 || (mddev->max_disks && raid_disks >= mddev->max_disks)) return -EINVAL; if (mddev->sync_thread || test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || 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 || mddev->thread == NULL) { rv = -EINVAL; goto err; } if (mddev->recovery || mddev->sync_thread) { rv = -EBUSY; goto err; } if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { struct bitmap *bitmap; /* add the bitmap */ if (mddev->bitmap) { rv = -EEXIST; goto err; } if (mddev->bitmap_info.default_offset == 0) { rv = -EINVAL; goto err; } mddev->bitmap_info.offset = mddev->bitmap_info.default_offset; mddev->bitmap_info.space = mddev->bitmap_info.default_space; bitmap = md_bitmap_create(mddev, -1); mddev_suspend(mddev); if (!IS_ERR(bitmap)) { mddev->bitmap = bitmap; rv = md_bitmap_load(mddev); } else rv = PTR_ERR(bitmap); if (rv) md_bitmap_destroy(mddev); mddev_resume(mddev); } else { /* remove the bitmap */ if (!mddev->bitmap) { rv = -ENOENT; goto err; } if (mddev->bitmap->storage.file) { rv = -EINVAL; goto err; } if (mddev->bitmap_info.nodes) { /* hold PW on all the bitmap lock */ if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { pr_warn("md: can't change bitmap to none since the array is in use by more than one node\n"); rv = -EPERM; md_cluster_ops->unlock_all_bitmaps(mddev); goto err; } mddev->bitmap_info.nodes = 0; md_cluster_ops->leave(mddev); } mddev_suspend(mddev); md_bitmap_destroy(mddev); mddev_resume(mddev); mddev->bitmap_info.offset = 0; } } md_update_sb(mddev, 1); return rv; err: 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 = md_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 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: case CLUSTERED_DISK_NACK: 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; bool did_set_md_closing = false; if (!md_ioctl_valid(cmd)) return -ENOTTY; switch (cmd) { case RAID_VERSION: case GET_ARRAY_INFO: case GET_DISK_INFO: break; default: if (!capable(CAP_SYS_ADMIN)) return -EACCES; } /* * Commands dealing with the RAID driver but not any * particular array: */ switch (cmd) { case RAID_VERSION: err = get_version(argp); goto out; #ifndef MODULE case RAID_AUTORUN: err = 0; autostart_arrays(arg); goto out; #endif default:; } /* * Commands creating/starting a new array: */ mddev = bdev->bd_disk->private_data; if (!mddev) { BUG(); goto out; } /* Some actions do not requires the mutex */ switch (cmd) { case GET_ARRAY_INFO: if (!mddev->raid_disks && !mddev->external) err = -ENODEV; else err = get_array_info(mddev, argp); goto out; case GET_DISK_INFO: if (!mddev->raid_disks && !mddev->external) err = -ENODEV; else err = get_disk_info(mddev, argp); goto out; case SET_DISK_FAULTY: err = set_disk_faulty(mddev, new_decode_dev(arg)); goto out; case GET_BITMAP_FILE: err = get_bitmap_file(mddev, argp); goto out; } 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->recovery), msecs_to_jiffies(5000)); if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { /* Need to flush page cache, and ensure no-one else opens * and writes */ mutex_lock(&mddev->open_mutex); if (mddev->pers && atomic_read(&mddev->openers) > 1) { mutex_unlock(&mddev->open_mutex); err = -EBUSY; goto out; } WARN_ON_ONCE(test_bit(MD_CLOSING, &mddev->flags)); set_bit(MD_CLOSING, &mddev->flags); did_set_md_closing = true; mutex_unlock(&mddev->open_mutex); sync_blockdev(bdev); } err = mddev_lock(mddev); if (err) { pr_debug("md: ioctl lock interrupted, reason %d, cmd %d\n", err, cmd); goto out; } 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 unlock; } if (mddev->pers) { err = update_array_info(mddev, &info); if (err) { pr_warn("md: couldn't update array info. %d\n", err); goto unlock; } goto unlock; } if (!list_empty(&mddev->disks)) { pr_warn("md: array %s already has disks!\n", mdname(mddev)); err = -EBUSY; goto unlock; } if (mddev->raid_disks) { pr_warn("md: array %s already initialised!\n", mdname(mddev)); err = -EBUSY; goto unlock; } err = set_array_info(mddev, &info); if (err) { pr_warn("md: couldn't set array info. %d\n", err); goto unlock; } goto 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 unlock; } /* * Commands even a read-only array can execute: */ switch (cmd) { case RESTART_ARRAY_RW: err = restart_array(mddev); goto unlock; case STOP_ARRAY: err = do_md_stop(mddev, 0, bdev); goto unlock; case STOP_ARRAY_RO: err = md_set_readonly(mddev, bdev); goto unlock; case HOT_REMOVE_DISK: err = hot_remove_disk(mddev, new_decode_dev(arg)); goto unlock; case ADD_NEW_DISK: /* We can support ADD_NEW_DISK on read-only arrays * only 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 unlock; } break; case BLKROSET: if (get_user(ro, (int __user *)(arg))) { err = -EFAULT; goto unlock; } err = -EINVAL; /* if the bdev is going readonly the value of mddev->ro * does not matter, no writes are coming */ if (ro) goto unlock; /* are we are already prepared for writes? */ if (mddev->ro != 1) goto 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 unlock; } /* * The remaining ioctls are changing the state of the * superblock, so we do not allow them on read-only arrays. */ if (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_SB_CHANGE_DEVS, &mddev->sb_flags)) { mddev_unlock(mddev); wait_event(mddev->sb_wait, !test_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags) && !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); mddev_lock_nointr(mddev); } } else { err = -EROFS; goto 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 unlock; } case CLUSTERED_DISK_NACK: if (mddev_is_clustered(mddev)) md_cluster_ops->new_disk_ack(mddev, false); else err = -EINVAL; goto unlock; case HOT_ADD_DISK: err = hot_add_disk(mddev, new_decode_dev(arg)); goto unlock; case RUN_ARRAY: err = do_md_run(mddev); goto unlock; case SET_BITMAP_FILE: err = set_bitmap_file(mddev, (int)arg); goto unlock; default: err = -EINVAL; goto unlock; } unlock: if (mddev->hold_active == UNTIL_IOCTL && err != -EINVAL) mddev->hold_active = 0; mddev_unlock(mddev); out: if(did_set_md_closing) clear_bit(MD_CLOSING, &mddev->flags); 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; if (test_bit(MD_CLOSING, &mddev->flags)) { mutex_unlock(&mddev->open_mutex); err = -ENODEV; goto out; } err = 0; atomic_inc(&mddev->openers); mutex_unlock(&mddev->open_mutex); check_disk_change(bdev); out: if (err) mddev_put(mddev); 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() || kthread_should_park(), thread->timeout); clear_bit(THREAD_WAKEUP, &thread->flags); if (kthread_should_park()) kthread_parkme(); 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); } } EXPORT_SYMBOL(md_wakeup_thread); 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; } EXPORT_SYMBOL(md_register_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); } EXPORT_SYMBOL(md_unregister_thread); void md_error(struct mddev *mddev, struct md_rdev *rdev) { 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(mddev); } EXPORT_SYMBOL(md_error); /* 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 int status_resync(struct seq_file *seq, struct mddev *mddev) { sector_t max_sectors, resync, res; unsigned long dt, db = 0; sector_t rt, curr_mark_cnt, resync_mark_cnt; int scale, recovery_active; unsigned int per_milli; 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; if (resync <= 3) { if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) /* Still cleaning up */ resync = max_sectors; } else if (resync > max_sectors) resync = max_sectors; else resync -= atomic_read(&mddev->recovery_active); if (resync == 0) { if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery)) { struct md_rdev *rdev; rdev_for_each(rdev, mddev) if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags) && rdev->recovery_offset != MaxSector && rdev->recovery_offset) { seq_printf(seq, "\trecover=REMOTE"); return 1; } if (mddev->reshape_position != MaxSector) seq_printf(seq, "\treshape=REMOTE"); else seq_printf(seq, "\tresync=REMOTE"); return 1; } if (mddev->recovery_cp < MaxSector) { seq_printf(seq, "\tresync=PENDING"); return 1; } return 0; } if (resync < 3) { seq_printf(seq, "\tresync=DELAYED"); return 1; } WARN_ON(max_sectors == 0); /* 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, which is always 64bit now. We are keeping * the original algorithm, but it is not really necessary. * * Original algorithm: * 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++; curr_mark_cnt = mddev->curr_mark_cnt; recovery_active = atomic_read(&mddev->recovery_active); resync_mark_cnt = mddev->resync_mark_cnt; if (curr_mark_cnt >= (recovery_active + resync_mark_cnt)) db = curr_mark_cnt - (recovery_active + resync_mark_cnt); rt = max_sectors - resync; /* number of remaining sectors */ rt = div64_u64(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); return 1; } 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; } spin_lock(&mddev->lock); 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; rcu_read_lock(); rdev_for_each_rcu(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(Journal, &rdev->flags)) seq_printf(seq, "(J)"); 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; } rcu_read_unlock(); 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 (status_resync(seq, mddev)) seq_printf(seq, "\n "); } } else seq_printf(seq, "\n "); md_bitmap_status(seq, mddev->bitmap); seq_printf(seq, "\n"); } spin_unlock(&mddev->lock); 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 int md_unloading; static __poll_t mdstat_poll(struct file *filp, poll_table *wait) { struct seq_file *seq = filp->private_data; __poll_t mask; if (md_unloading) return EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI; poll_wait(filp, &md_event_waiters, wait); /* always allow read */ mask = EPOLLIN | EPOLLRDNORM; if (seq->poll_event != atomic_read(&md_event_count)) mask |= EPOLLERR | EPOLLPRI; return mask; } static const struct proc_ops mdstat_proc_ops = { .proc_open = md_seq_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = seq_release, .proc_poll = mdstat_poll, }; int register_md_personality(struct md_personality *p) { pr_debug("md: %s personality registered for level %d\n", p->name, p->level); spin_lock(&pers_lock); list_add_tail(&p->list, &pers_list); spin_unlock(&pers_lock); return 0; } EXPORT_SYMBOL(register_md_personality); int unregister_md_personality(struct md_personality *p) { pr_debug("md: %s personality unregistered\n", p->name); spin_lock(&pers_lock); list_del_init(&p->list); spin_unlock(&pers_lock); return 0; } EXPORT_SYMBOL(unregister_md_personality); int register_md_cluster_operations(struct md_cluster_operations *ops, struct module *module) { int ret = 0; spin_lock(&pers_lock); if (md_cluster_ops != NULL) ret = -EALREADY; else { md_cluster_ops = ops; md_cluster_mod = module; } spin_unlock(&pers_lock); return ret; } EXPORT_SYMBOL(register_md_cluster_operations); int unregister_md_cluster_operations(void) { spin_lock(&pers_lock); md_cluster_ops = NULL; spin_unlock(&pers_lock); return 0; } EXPORT_SYMBOL(unregister_md_cluster_operations); int md_setup_cluster(struct mddev *mddev, int nodes) { if (!md_cluster_ops) request_module("md-cluster"); spin_lock(&pers_lock); /* ensure module won't be unloaded */ if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { pr_warn("can't find md-cluster module or get it's reference.\n"); spin_unlock(&pers_lock); return -ENOENT; } spin_unlock(&pers_lock); return md_cluster_ops->join(mddev, nodes); } void md_cluster_stop(struct mddev *mddev) { if (!md_cluster_ops) return; md_cluster_ops->leave(mddev); module_put(md_cluster_mod); } 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_accum(&disk->part0, sectors) - atomic_read(&disk->sync_io); /* sync IO will cause sync_io to increase before the disk_stats * as sync_io is counted when a request starts, and * disk_stats is counted when it completes. * So resync activity will cause curr_events to be smaller than * when there was no such activity. * non-sync IO will cause disk_stat to increase without * increasing sync_io so curr_events will (eventually) * be larger than it was before. Once it becomes * substantially larger, the test below will cause * the array to appear non-idle, and resync will slow * down. * If there is a lot of outstanding resync activity when * we set last_event to curr_events, then all that activity * completing might cause the array to appear non-idle * and resync will be slowed down even though there might * not have been non-resync activity. This will only * happen once though. 'last_events' will soon reflect * the state where there is little or no outstanding * resync requests, and further resync activity will * always make curr_events less than last_events. * */ if (init || curr_events - rdev->last_events > 64) { rdev->last_events = curr_events; idle = 0; } } 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 .... } } EXPORT_SYMBOL(md_done_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. * A return value of 'false' means that the write wasn't recorded * and cannot proceed as the array is being suspend. */ bool md_write_start(struct mddev *mddev, struct bio *bi) { int did_change = 0; if (bio_data_dir(bi) != WRITE) return true; 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; } rcu_read_lock(); percpu_ref_get(&mddev->writes_pending); smp_mb(); /* Match smp_mb in set_in_sync() */ if (mddev->safemode == 1) mddev->safemode = 0; /* sync_checkers is always 0 when writes_pending is in per-cpu mode */ if (mddev->in_sync || mddev->sync_checkers) { spin_lock(&mddev->lock); if (mddev->in_sync) { mddev->in_sync = 0; set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); md_wakeup_thread(mddev->thread); did_change = 1; } spin_unlock(&mddev->lock); } rcu_read_unlock(); if (did_change) sysfs_notify_dirent_safe(mddev->sysfs_state); if (!mddev->has_superblocks) return true; wait_event(mddev->sb_wait, !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags) || mddev->suspended); if (test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { percpu_ref_put(&mddev->writes_pending); return false; } return true; } EXPORT_SYMBOL(md_write_start); /* md_write_inc can only be called when md_write_start() has * already been called at least once of the current request. * It increments the counter and is useful when a single request * is split into several parts. Each part causes an increment and * so needs a matching md_write_end(). * Unlike md_write_start(), it is safe to call md_write_inc() inside * a spinlocked region. */ void md_write_inc(struct mddev *mddev, struct bio *bi) { if (bio_data_dir(bi) != WRITE) return; WARN_ON_ONCE(mddev->in_sync || mddev->ro); percpu_ref_get(&mddev->writes_pending); } EXPORT_SYMBOL(md_write_inc); void md_write_end(struct mddev *mddev) { percpu_ref_put(&mddev->writes_pending); if (mddev->safemode == 2) md_wakeup_thread(mddev->thread); else if (mddev->safemode_delay) /* The roundup() ensures this only performs locking once * every ->safemode_delay jiffies */ mod_timer(&mddev->safemode_timer, roundup(jiffies, mddev->safemode_delay) + mddev->safemode_delay); } EXPORT_SYMBOL(md_write_end); /* 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. */ void md_allow_write(struct mddev *mddev) { if (!mddev->pers) return; if (mddev->ro) return; if (!mddev->pers->sync_request) return; spin_lock(&mddev->lock); if (mddev->in_sync) { mddev->in_sync = 0; set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags); set_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); if (mddev->safemode_delay && mddev->safemode == 0) mddev->safemode = 1; spin_unlock(&mddev->lock); md_update_sb(mddev, 0); sysfs_notify_dirent_safe(mddev->sysfs_state); /* wait for the dirty state to be recorded in the metadata */ wait_event(mddev->sb_wait, !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)); } else spin_unlock(&mddev->lock); } 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, recovery_done; 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; int ret; /* just incase thread restarts... */ if (test_bit(MD_RECOVERY_DONE, &mddev->recovery) || test_bit(MD_RECOVERY_WAIT, &mddev->recovery)) return; if (mddev->ro) {/* never try to sync a read-only array */ set_bit(MD_RECOVERY_INTR, &mddev->recovery); return; } if (mddev_is_clustered(mddev)) { ret = md_cluster_ops->resync_start(mddev); if (ret) goto skip; set_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags); if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) && ((unsigned long long)mddev->curr_resync_completed < (unsigned long long)mddev->resync_max_sectors)) goto skip; } if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { desc = "data-check"; action = "check"; } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { desc = "requested-resync"; action = "repair"; } else desc = "resync"; } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) desc = "reshape"; else desc = "recovery"; 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 * commence * 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 { int mddev2_minor = -1; 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) { if (mddev2_minor != mddev2->md_minor) { mddev2_minor = mddev2->md_minor; pr_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; /* * If the original node aborts reshaping then we continue the * reshaping, so set j again to avoid restart reshape from the * first beginning */ if (mddev_is_clustered(mddev) && mddev->reshape_position != MaxSector) j = mddev->reshape_position; } else { /* recovery follows the physical size of devices */ max_sectors = mddev->dev_sectors; j = MaxSector; rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && !test_bit(Faulty, &rdev->flags) && !test_bit(In_sync, &rdev->flags) && rdev->recovery_offset < j) j = rdev->recovery_offset; rcu_read_unlock(); /* If there is a bitmap, we need to make sure all * writes that started before we added a spare * complete before we start doing a recovery. * Otherwise the write might complete and (via * bitmap_endwrite) set a bit in the bitmap after the * recovery has checked that bit and skipped that * region. */ if (mddev->bitmap) { mddev->pers->quiesce(mddev, 1); mddev->pers->quiesce(mddev, 0); } } pr_info("md: %s of RAID array %s\n", desc, mdname(mddev)); pr_debug("md: minimum _guaranteed_ speed: %d KB/sec/disk.\n", speed_min(mddev)); pr_debug("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); pr_debug("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) { pr_debug("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 || mddev->curr_resync_completed > mddev->resync_max )) { /* 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_SB_CHANGE_CLEAN, &mddev->sb_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); 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 > max_sectors) /* when skipping, extra large numbers can be returned. */ j = max_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(); recovery_done = io_sectors - atomic_read(&mddev->recovery_active); currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 /((jiffies-mddev->resync_mark)/HZ +1) +1; if (currspeed > speed_min(mddev)) { if (currspeed > speed_max(mddev)) { msleep(500); goto repeat; } if (!is_mddev_idle(mddev, 0)) { /* * Give other IO more of a chance. * The faster the devices, the less we wait. */ wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); } } } pr_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)); if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && mddev->curr_resync > 3) { mddev->curr_resync_completed = mddev->curr_resync; sysfs_notify(&mddev->kobj, NULL, "sync_completed"); } mddev->pers->sync_request(mddev, max_sectors, &skipped); if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && mddev->curr_resync > 3) { if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { if (mddev->curr_resync >= mddev->recovery_cp) { pr_debug("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; if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) { rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) if (rdev->raid_disk >= 0 && mddev->delta_disks >= 0 && !test_bit(Journal, &rdev->flags) && !test_bit(Faulty, &rdev->flags) && !test_bit(In_sync, &rdev->flags) && rdev->recovery_offset < mddev->curr_resync) rdev->recovery_offset = mddev->curr_resync; rcu_read_unlock(); } } } skip: /* set CHANGE_PENDING here since maybe another update is needed, * so other nodes are informed. It should be harmless for normal * raid */ set_mask_bits(&mddev->sb_flags, 0, BIT(MD_SB_CHANGE_PENDING) | BIT(MD_SB_CHANGE_DEVS)); if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && mddev->delta_disks > 0 && mddev->pers->finish_reshape && mddev->pers->size && mddev->queue) { mddev_lock_nointr(mddev); md_set_array_sectors(mddev, mddev->pers->size(mddev, 0, 0)); mddev_unlock(mddev); if (!mddev_is_clustered(mddev)) { set_capacity(mddev->gendisk, mddev->array_sectors); revalidate_disk(mddev->gendisk); } } spin_lock(&mddev->lock); 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; set_bit(MD_RECOVERY_DONE, &mddev->recovery); mddev->curr_resync = 0; spin_unlock(&mddev->lock); wake_up(&resync_wait); 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; bool remove_some = false; if (this && test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) /* Mustn't remove devices when resync thread is running */ return 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) && atomic_read(&rdev->nr_pending)==0) { /* Faulty non-Blocked devices with nr_pending == 0 * never get nr_pending incremented, * never get Faulty cleared, and never get Blocked set. * So we can synchronize_rcu now rather than once per device */ remove_some = true; set_bit(RemoveSynchronized, &rdev->flags); } } if (remove_some) synchronize_rcu(); rdev_for_each(rdev, mddev) { if ((this == NULL || rdev == this) && rdev->raid_disk >= 0 && !test_bit(Blocked, &rdev->flags) && ((test_bit(RemoveSynchronized, &rdev->flags) || (!test_bit(In_sync, &rdev->flags) && !test_bit(Journal, &rdev->flags))) && atomic_read(&rdev->nr_pending)==0)) { if (mddev->pers->hot_remove_disk( mddev, rdev) == 0) { sysfs_unlink_rdev(mddev, rdev); rdev->saved_raid_disk = rdev->raid_disk; rdev->raid_disk = -1; removed++; } } if (remove_some && test_bit(RemoveSynchronized, &rdev->flags)) clear_bit(RemoveSynchronized, &rdev->flags); } if (removed && mddev->kobj.sd) sysfs_notify(&mddev->kobj, NULL, "degraded"); if (this && removed) goto no_add; rdev_for_each(rdev, mddev) { if (this && this != rdev) continue; if (test_bit(Candidate, &rdev->flags)) continue; if (rdev->raid_disk >= 0 && !test_bit(In_sync, &rdev->flags) && !test_bit(Journal, &rdev->flags) && !test_bit(Faulty, &rdev->flags)) spares++; if (rdev->raid_disk >= 0) continue; if (test_bit(Faulty, &rdev->flags)) continue; if (!test_bit(Journal, &rdev->flags)) { if (mddev->ro && ! (rdev->saved_raid_disk >= 0 && !test_bit(Bitmap_sync, &rdev->flags))) continue; rdev->recovery_offset = 0; } if (mddev->pers-> hot_add_disk(mddev, rdev) == 0) { if (sysfs_link_rdev(mddev, rdev)) /* failure here is OK */; if (!test_bit(Journal, &rdev->flags)) spares++; md_new_event(mddev); set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); } } no_add: if (removed) set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); return spares; } static void md_start_sync(struct work_struct *ws) { struct mddev *mddev = container_of(ws, struct mddev, del_work); mddev->sync_thread = md_register_thread(md_do_sync, mddev, "resync"); if (!mddev->sync_thread) { pr_warn("%s: could not start resync thread...\n", mdname(mddev)); /* leave the spares where they are, it shouldn't hurt */ clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); wake_up(&resync_wait); if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) if (mddev->sysfs_action) sysfs_notify_dirent_safe(mddev->sysfs_action); } else md_wakeup_thread(mddev->sync_thread); sysfs_notify_dirent_safe(mddev->sysfs_action); md_new_event(mddev); } /* * 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 (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags) && mddev->sb_flags) { /* Write superblock - thread that called mddev_suspend() * holds reconfig_mutex for us. */ set_bit(MD_UPDATING_SB, &mddev->flags); smp_mb__after_atomic(); if (test_bit(MD_ALLOW_SB_UPDATE, &mddev->flags)) md_update_sb(mddev, 0); clear_bit_unlock(MD_UPDATING_SB, &mddev->flags); wake_up(&mddev->sb_wait); } if (mddev->suspended) return; if (mddev->bitmap) md_bitmap_daemon_work(mddev); if (signal_pending(current)) { if (mddev->pers->sync_request && !mddev->external) { pr_debug("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->sb_flags & ~ (1<<MD_SB_CHANGE_PENDING)) || test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || test_bit(MD_RECOVERY_DONE, &mddev->recovery) || (mddev->external == 0 && mddev->safemode == 1) || (mddev->safemode == 2 && !mddev->in_sync && mddev->recovery_cp == MaxSector) )) return; if (mddev_trylock(mddev)) { int spares = 0; bool try_set_sync = mddev->safemode != 0; if (!mddev->external && mddev->safemode == 1) mddev->safemode = 0; if (mddev->ro) { struct md_rdev *rdev; if (!mddev->external && mddev->in_sync) /* 'Blocked' flag not needed as failed devices * will be recorded if array switched to read/write. * Leaving it set will prevent the device * from being removed. */ rdev_for_each(rdev, mddev) clear_bit(Blocked, &rdev->flags); /* On a read-only array we can: * - remove failed devices * - add already-in_sync devices if the array itself * is in-sync. * As we only add devices that are already in-sync, * we can activate the spares immediately. */ remove_and_add_spares(mddev, NULL); /* There is no thread, but we need to call * ->spare_active and clear saved_raid_disk */ set_bit(MD_RECOVERY_INTR, &mddev->recovery); md_reap_sync_thread(mddev); clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags); goto unlock; } if (mddev_is_clustered(mddev)) { struct md_rdev *rdev; /* kick the device if another node issued a * remove disk. */ rdev_for_each(rdev, mddev) { if (test_and_clear_bit(ClusterRemove, &rdev->flags) && rdev->raid_disk < 0) md_kick_rdev_from_array(rdev); } } if (try_set_sync && !mddev->external && !mddev->in_sync) { spin_lock(&mddev->lock); set_in_sync(mddev); spin_unlock(&mddev->lock); } if (mddev->sb_flags) md_update_sb(mddev, 0); if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { /* resync/recovery still happening */ clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); goto unlock; } if (mddev->sync_thread) { md_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; spin_lock(&mddev->lock); set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); spin_unlock(&mddev->lock); /* 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 not_running; /* no recovery is running. * remove any failed drives, then * add spares if possible. * Spares are also removed and re-added, to allow * the personality to fail the re-add. */ if (mddev->reshape_position != MaxSector) { if (mddev->pers->check_reshape == NULL || mddev->pers->check_reshape(mddev) != 0) /* Cannot proceed */ goto not_running; set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); } else if ((spares = remove_and_add_spares(mddev, NULL))) { clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); } else if (mddev->recovery_cp < MaxSector) { set_bit(MD_RECOVERY_SYNC, &mddev->recovery); clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) /* nothing to be done ... */ goto not_running; if (mddev->pers->sync_request) { if (spares) { /* We are adding a device or devices to an array * which has the bitmap stored on all devices. * So make sure all bitmap pages get written */ md_bitmap_write_all(mddev->bitmap); } INIT_WORK(&mddev->del_work, md_start_sync); queue_work(md_misc_wq, &mddev->del_work); goto unlock; } not_running: if (!mddev->sync_thread) { clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); wake_up(&resync_wait); if (test_and_clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) if (mddev->sysfs_action) sysfs_notify_dirent_safe(mddev->sysfs_action); } unlock: wake_up(&mddev->sb_wait); mddev_unlock(mddev); } } EXPORT_SYMBOL(md_check_recovery); void md_reap_sync_thread(struct mddev *mddev) { struct md_rdev *rdev; sector_t old_dev_sectors = mddev->dev_sectors; bool is_reshaped = false; /* resync has finished, collect result */ md_unregister_thread(&mddev->sync_thread); if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && mddev->degraded != mddev->raid_disks) { /* success...*/ /* activate any spares */ if (mddev->pers->spare_active(mddev)) { sysfs_notify(&mddev->kobj, NULL, "degraded"); set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); } } if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && mddev->pers->finish_reshape) { mddev->pers->finish_reshape(mddev); if (mddev_is_clustered(mddev)) is_reshaped = true; } /* 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); /* MD_SB_CHANGE_PENDING should be cleared by md_update_sb, so we can * call resync_finish here if MD_CLUSTER_RESYNC_LOCKED is set by * clustered raid */ if (test_and_clear_bit(MD_CLUSTER_RESYNC_LOCKED, &mddev->flags)) md_cluster_ops->resync_finish(mddev); clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); clear_bit(MD_RECOVERY_DONE, &mddev->recovery); clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); /* * We call md_cluster_ops->update_size here because sync_size could * be changed by md_update_sb, and MD_RECOVERY_RESHAPE is cleared, * so it is time to update size across cluster. */ if (mddev_is_clustered(mddev) && is_reshaped && !test_bit(MD_CLOSING, &mddev->flags)) md_cluster_ops->update_size(mddev, old_dev_sectors); wake_up(&resync_wait); /* 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); } EXPORT_SYMBOL(md_reap_sync_thread); void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) { sysfs_notify_dirent_safe(rdev->sysfs_state); wait_event_timeout(rdev->blocked_wait, !test_bit(Blocked, &rdev->flags) && !test_bit(BlockedBadBlocks, &rdev->flags), 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 */ /* Returns 1 on success, 0 on failure */ int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, int is_new) { struct mddev *mddev = rdev->mddev; int rv; if (is_new) s += rdev->new_data_offset; else s += rdev->data_offset; rv = badblocks_set(&rdev->badblocks, s, sectors, 0); if (rv == 0) { /* Make sure they get written out promptly */ if (test_bit(ExternalBbl, &rdev->flags)) sysfs_notify(&rdev->kobj, NULL, "unacknowledged_bad_blocks"); sysfs_notify_dirent_safe(rdev->sysfs_state); set_mask_bits(&mddev->sb_flags, 0, BIT(MD_SB_CHANGE_CLEAN) | BIT(MD_SB_CHANGE_PENDING)); md_wakeup_thread(rdev->mddev->thread); return 1; } else return 0; } EXPORT_SYMBOL_GPL(rdev_set_badblocks); int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, int is_new) { int rv; if (is_new) s += rdev->new_data_offset; else s += rdev->data_offset; rv = badblocks_clear(&rdev->badblocks, s, sectors); if ((rv == 0) && test_bit(ExternalBbl, &rdev->flags)) sysfs_notify(&rdev->kobj, NULL, "bad_blocks"); return rv; } EXPORT_SYMBOL_GPL(rdev_clear_badblocks); 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, &mdstat_proc_ops); } 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), 512, 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; } static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) { struct mdp_superblock_1 *sb = page_address(rdev->sb_page); struct md_rdev *rdev2; int role, ret; char b[BDEVNAME_SIZE]; /* * If size is changed in another node then we need to * do resize as well. */ if (mddev->dev_sectors != le64_to_cpu(sb->size)) { ret = mddev->pers->resize(mddev, le64_to_cpu(sb->size)); if (ret) pr_info("md-cluster: resize failed\n"); else md_bitmap_update_sb(mddev->bitmap); } /* Check for change of roles in the active devices */ rdev_for_each(rdev2, mddev) { if (test_bit(Faulty, &rdev2->flags)) continue; /* Check if the roles changed */ role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); if (test_bit(Candidate, &rdev2->flags)) { if (role == 0xfffe) { pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); md_kick_rdev_from_array(rdev2); continue; } else clear_bit(Candidate, &rdev2->flags); } if (role != rdev2->raid_disk) { /* * got activated except reshape is happening. */ if (rdev2->raid_disk == -1 && role != 0xffff && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { rdev2->saved_raid_disk = role; ret = remove_and_add_spares(mddev, rdev2); pr_info("Activated spare: %s\n", bdevname(rdev2->bdev,b)); /* wakeup mddev->thread here, so array could * perform resync with the new activated disk */ set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); md_wakeup_thread(mddev->thread); } /* device faulty * We just want to do the minimum to mark the disk * as faulty. The recovery is performed by the * one who initiated the error. */ if ((role == 0xfffe) || (role == 0xfffd)) { md_error(mddev, rdev2); clear_bit(Blocked, &rdev2->flags); } } } if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); /* * Since mddev->delta_disks has already updated in update_raid_disks, * so it is time to check reshape. */ if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && (le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { /* * reshape is happening in the remote node, we need to * update reshape_position and call start_reshape. */ mddev->reshape_position = le64_to_cpu(sb->reshape_position); if (mddev->pers->update_reshape_pos) mddev->pers->update_reshape_pos(mddev); if (mddev->pers->start_reshape) mddev->pers->start_reshape(mddev); } else if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) && mddev->reshape_position != MaxSector && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { /* reshape is just done in another node. */ mddev->reshape_position = MaxSector; if (mddev->pers->update_reshape_pos) mddev->pers->update_reshape_pos(mddev); } /* Finally set the event to be up to date */ mddev->events = le64_to_cpu(sb->events); } static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) { int err; struct page *swapout = rdev->sb_page; struct mdp_superblock_1 *sb; /* Store the sb page of the rdev in the swapout temporary * variable in case we err in the future */ rdev->sb_page = NULL; err = alloc_disk_sb(rdev); if (err == 0) { ClearPageUptodate(rdev->sb_page); rdev->sb_loaded = 0; err = super_types[mddev->major_version]. load_super(rdev, NULL, mddev->minor_version); } if (err < 0) { pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", __func__, __LINE__, rdev->desc_nr, err); if (rdev->sb_page) put_page(rdev->sb_page); rdev->sb_page = swapout; rdev->sb_loaded = 1; return err; } sb = page_address(rdev->sb_page); /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET * is not set */ if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); /* The other node finished recovery, call spare_active to set * device In_sync and mddev->degraded */ if (rdev->recovery_offset == MaxSector && !test_bit(In_sync, &rdev->flags) && mddev->pers->spare_active(mddev)) sysfs_notify(&mddev->kobj, NULL, "degraded"); put_page(swapout); return 0; } void md_reload_sb(struct mddev *mddev, int nr) { struct md_rdev *rdev; int err; /* Find the rdev */ rdev_for_each_rcu(rdev, mddev) { if (rdev->desc_nr == nr) break; } if (!rdev || rdev->desc_nr != nr) { pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); return; } err = read_rdev(mddev, rdev); if (err < 0) return; check_sb_changes(mddev, rdev); /* Read all rdev's to update recovery_offset */ rdev_for_each_rcu(rdev, mddev) { if (!test_bit(Faulty, &rdev->flags)) read_rdev(mddev, rdev); } } EXPORT_SYMBOL(md_reload_sb); #ifndef MODULE /* * Searches all registered partitions for autorun RAID arrays * at boot time. */ static DEFINE_MUTEX(detected_devices_mutex); 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; mutex_lock(&detected_devices_mutex); list_add_tail(&node_detected_dev->list, &all_detected_devices); mutex_unlock(&detected_devices_mutex); } } 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; pr_info("md: Autodetecting RAID arrays.\n"); mutex_lock(&detected_devices_mutex); 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); mutex_unlock(&detected_devices_mutex); rdev = md_import_device(dev,0, 90); mutex_lock(&detected_devices_mutex); if (IS_ERR(rdev)) continue; if (test_bit(Faulty, &rdev->flags)) continue; set_bit(AutoDetected, &rdev->flags); list_add(&rdev->same_set, &pending_raid_disks); i_passed++; } mutex_unlock(&detected_devices_mutex); pr_debug("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; int delay = 1; blk_unregister_region(MKDEV(MD_MAJOR,0), 512); 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); /* We cannot unload the modules while some process is * waiting for us in select() or poll() - wake them up */ md_unloading = 1; while (waitqueue_active(&md_event_waiters)) { /* not safe to leave yet */ wake_up(&md_event_waiters); msleep(delay); delay += delay; } remove_proc_entry("mdstat", NULL); for_each_mddev(mddev, tmp) { export_array(mddev); mddev->ctime = 0; mddev->hold_active = 0; /* * for_each_mddev() will call mddev_put() at the end of each * iteration. As the mddev is now fully clear, this will * schedule the mddev for destruction by a workqueue, and the * destroy_workqueue() below will wait for that to complete. */ } destroy_workqueue(md_misc_wq); destroy_workqueue(md_wq); } subsys_initcall(md_init); module_exit(md_exit) static int get_ro(char *buffer, const struct kernel_param *kp) { return sprintf(buffer, "%d", start_readonly); } static int set_ro(const char *val, const struct kernel_param *kp) { return kstrtouint(val, 10, (unsigned int *)&start_readonly); } module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); module_param(create_on_open, bool, S_IRUSR|S_IWUSR); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("MD RAID framework"); MODULE_ALIAS("md"); MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
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