| 1 | /* |
| 2 | md.c : Multiple Devices driver for Linux |
| 3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar |
| 4 | |
| 5 | completely rewritten, based on the MD driver code from Marc Zyngier |
| 6 | |
| 7 | Changes: |
| 8 | |
| 9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar |
| 10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> |
| 11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> |
| 12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> |
| 13 | - kmod support by: Cyrus Durgin |
| 14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> |
| 15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> |
| 16 | |
| 17 | - lots of fixes and improvements to the RAID1/RAID5 and generic |
| 18 | RAID code (such as request based resynchronization): |
| 19 | |
| 20 | Neil Brown <neilb@cse.unsw.edu.au>. |
| 21 | |
| 22 | - persistent bitmap code |
| 23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. |
| 24 | |
| 25 | This program is free software; you can redistribute it and/or modify |
| 26 | it under the terms of the GNU General Public License as published by |
| 27 | the Free Software Foundation; either version 2, or (at your option) |
| 28 | any later version. |
| 29 | |
| 30 | You should have received a copy of the GNU General Public License |
| 31 | (for example /usr/src/linux/COPYING); if not, write to the Free |
| 32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 33 | */ |
| 34 | |
| 35 | #include <linux/kthread.h> |
| 36 | #include <linux/blkdev.h> |
| 37 | #include <linux/sysctl.h> |
| 38 | #include <linux/seq_file.h> |
| 39 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
| 40 | #include <linux/poll.h> |
| 41 | #include <linux/ctype.h> |
| 42 | #include <linux/hdreg.h> |
| 43 | #include <linux/proc_fs.h> |
| 44 | #include <linux/random.h> |
| 45 | #include <linux/reboot.h> |
| 46 | #include <linux/file.h> |
| 47 | #include <linux/delay.h> |
| 48 | #include <linux/raid/md_p.h> |
| 49 | #include <linux/raid/md_u.h> |
| 50 | #include "md.h" |
| 51 | #include "bitmap.h" |
| 52 | |
| 53 | #define DEBUG 0 |
| 54 | #define dprintk(x...) ((void)(DEBUG && printk(x))) |
| 55 | |
| 56 | |
| 57 | #ifndef MODULE |
| 58 | static void autostart_arrays(int part); |
| 59 | #endif |
| 60 | |
| 61 | static LIST_HEAD(pers_list); |
| 62 | static DEFINE_SPINLOCK(pers_lock); |
| 63 | |
| 64 | static void md_print_devices(void); |
| 65 | |
| 66 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
| 67 | |
| 68 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
| 69 | |
| 70 | /* |
| 71 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' |
| 72 | * is 1000 KB/sec, so the extra system load does not show up that much. |
| 73 | * Increase it if you want to have more _guaranteed_ speed. Note that |
| 74 | * the RAID driver will use the maximum available bandwidth if the IO |
| 75 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
| 76 | * speed limit - in case reconstruction slows down your system despite |
| 77 | * idle IO detection. |
| 78 | * |
| 79 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. |
| 80 | * or /sys/block/mdX/md/sync_speed_{min,max} |
| 81 | */ |
| 82 | |
| 83 | static int sysctl_speed_limit_min = 1000; |
| 84 | static int sysctl_speed_limit_max = 200000; |
| 85 | static inline int speed_min(mddev_t *mddev) |
| 86 | { |
| 87 | return mddev->sync_speed_min ? |
| 88 | mddev->sync_speed_min : sysctl_speed_limit_min; |
| 89 | } |
| 90 | |
| 91 | static inline int speed_max(mddev_t *mddev) |
| 92 | { |
| 93 | return mddev->sync_speed_max ? |
| 94 | mddev->sync_speed_max : sysctl_speed_limit_max; |
| 95 | } |
| 96 | |
| 97 | static struct ctl_table_header *raid_table_header; |
| 98 | |
| 99 | static ctl_table raid_table[] = { |
| 100 | { |
| 101 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, |
| 102 | .procname = "speed_limit_min", |
| 103 | .data = &sysctl_speed_limit_min, |
| 104 | .maxlen = sizeof(int), |
| 105 | .mode = S_IRUGO|S_IWUSR, |
| 106 | .proc_handler = &proc_dointvec, |
| 107 | }, |
| 108 | { |
| 109 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, |
| 110 | .procname = "speed_limit_max", |
| 111 | .data = &sysctl_speed_limit_max, |
| 112 | .maxlen = sizeof(int), |
| 113 | .mode = S_IRUGO|S_IWUSR, |
| 114 | .proc_handler = &proc_dointvec, |
| 115 | }, |
| 116 | { .ctl_name = 0 } |
| 117 | }; |
| 118 | |
| 119 | static ctl_table raid_dir_table[] = { |
| 120 | { |
| 121 | .ctl_name = DEV_RAID, |
| 122 | .procname = "raid", |
| 123 | .maxlen = 0, |
| 124 | .mode = S_IRUGO|S_IXUGO, |
| 125 | .child = raid_table, |
| 126 | }, |
| 127 | { .ctl_name = 0 } |
| 128 | }; |
| 129 | |
| 130 | static ctl_table raid_root_table[] = { |
| 131 | { |
| 132 | .ctl_name = CTL_DEV, |
| 133 | .procname = "dev", |
| 134 | .maxlen = 0, |
| 135 | .mode = 0555, |
| 136 | .child = raid_dir_table, |
| 137 | }, |
| 138 | { .ctl_name = 0 } |
| 139 | }; |
| 140 | |
| 141 | static struct block_device_operations md_fops; |
| 142 | |
| 143 | static int start_readonly; |
| 144 | |
| 145 | /* |
| 146 | * We have a system wide 'event count' that is incremented |
| 147 | * on any 'interesting' event, and readers of /proc/mdstat |
| 148 | * can use 'poll' or 'select' to find out when the event |
| 149 | * count increases. |
| 150 | * |
| 151 | * Events are: |
| 152 | * start array, stop array, error, add device, remove device, |
| 153 | * start build, activate spare |
| 154 | */ |
| 155 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
| 156 | static atomic_t md_event_count; |
| 157 | void md_new_event(mddev_t *mddev) |
| 158 | { |
| 159 | atomic_inc(&md_event_count); |
| 160 | wake_up(&md_event_waiters); |
| 161 | } |
| 162 | EXPORT_SYMBOL_GPL(md_new_event); |
| 163 | |
| 164 | /* Alternate version that can be called from interrupts |
| 165 | * when calling sysfs_notify isn't needed. |
| 166 | */ |
| 167 | static void md_new_event_inintr(mddev_t *mddev) |
| 168 | { |
| 169 | atomic_inc(&md_event_count); |
| 170 | wake_up(&md_event_waiters); |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * Enables to iterate over all existing md arrays |
| 175 | * all_mddevs_lock protects this list. |
| 176 | */ |
| 177 | static LIST_HEAD(all_mddevs); |
| 178 | static DEFINE_SPINLOCK(all_mddevs_lock); |
| 179 | |
| 180 | |
| 181 | /* |
| 182 | * iterates through all used mddevs in the system. |
| 183 | * We take care to grab the all_mddevs_lock whenever navigating |
| 184 | * the list, and to always hold a refcount when unlocked. |
| 185 | * Any code which breaks out of this loop while own |
| 186 | * a reference to the current mddev and must mddev_put it. |
| 187 | */ |
| 188 | #define for_each_mddev(mddev,tmp) \ |
| 189 | \ |
| 190 | for (({ spin_lock(&all_mddevs_lock); \ |
| 191 | tmp = all_mddevs.next; \ |
| 192 | mddev = NULL;}); \ |
| 193 | ({ if (tmp != &all_mddevs) \ |
| 194 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ |
| 195 | spin_unlock(&all_mddevs_lock); \ |
| 196 | if (mddev) mddev_put(mddev); \ |
| 197 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ |
| 198 | tmp != &all_mddevs;}); \ |
| 199 | ({ spin_lock(&all_mddevs_lock); \ |
| 200 | tmp = tmp->next;}) \ |
| 201 | ) |
| 202 | |
| 203 | |
| 204 | /* Rather than calling directly into the personality make_request function, |
| 205 | * IO requests come here first so that we can check if the device is |
| 206 | * being suspended pending a reconfiguration. |
| 207 | * We hold a refcount over the call to ->make_request. By the time that |
| 208 | * call has finished, the bio has been linked into some internal structure |
| 209 | * and so is visible to ->quiesce(), so we don't need the refcount any more. |
| 210 | */ |
| 211 | static int md_make_request(struct request_queue *q, struct bio *bio) |
| 212 | { |
| 213 | mddev_t *mddev = q->queuedata; |
| 214 | int rv; |
| 215 | if (mddev == NULL || mddev->pers == NULL) { |
| 216 | bio_io_error(bio); |
| 217 | return 0; |
| 218 | } |
| 219 | rcu_read_lock(); |
| 220 | if (mddev->suspended) { |
| 221 | DEFINE_WAIT(__wait); |
| 222 | for (;;) { |
| 223 | prepare_to_wait(&mddev->sb_wait, &__wait, |
| 224 | TASK_UNINTERRUPTIBLE); |
| 225 | if (!mddev->suspended) |
| 226 | break; |
| 227 | rcu_read_unlock(); |
| 228 | schedule(); |
| 229 | rcu_read_lock(); |
| 230 | } |
| 231 | finish_wait(&mddev->sb_wait, &__wait); |
| 232 | } |
| 233 | atomic_inc(&mddev->active_io); |
| 234 | rcu_read_unlock(); |
| 235 | rv = mddev->pers->make_request(q, bio); |
| 236 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
| 237 | wake_up(&mddev->sb_wait); |
| 238 | |
| 239 | return rv; |
| 240 | } |
| 241 | |
| 242 | static void mddev_suspend(mddev_t *mddev) |
| 243 | { |
| 244 | BUG_ON(mddev->suspended); |
| 245 | mddev->suspended = 1; |
| 246 | synchronize_rcu(); |
| 247 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); |
| 248 | mddev->pers->quiesce(mddev, 1); |
| 249 | md_unregister_thread(mddev->thread); |
| 250 | mddev->thread = NULL; |
| 251 | /* we now know that no code is executing in the personality module, |
| 252 | * except possibly the tail end of a ->bi_end_io function, but that |
| 253 | * is certain to complete before the module has a chance to get |
| 254 | * unloaded |
| 255 | */ |
| 256 | } |
| 257 | |
| 258 | static void mddev_resume(mddev_t *mddev) |
| 259 | { |
| 260 | mddev->suspended = 0; |
| 261 | wake_up(&mddev->sb_wait); |
| 262 | mddev->pers->quiesce(mddev, 0); |
| 263 | } |
| 264 | |
| 265 | |
| 266 | static inline mddev_t *mddev_get(mddev_t *mddev) |
| 267 | { |
| 268 | atomic_inc(&mddev->active); |
| 269 | return mddev; |
| 270 | } |
| 271 | |
| 272 | static void mddev_delayed_delete(struct work_struct *ws) |
| 273 | { |
| 274 | mddev_t *mddev = container_of(ws, mddev_t, del_work); |
| 275 | kobject_del(&mddev->kobj); |
| 276 | kobject_put(&mddev->kobj); |
| 277 | } |
| 278 | |
| 279 | static void mddev_put(mddev_t *mddev) |
| 280 | { |
| 281 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
| 282 | return; |
| 283 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
| 284 | !mddev->hold_active) { |
| 285 | list_del(&mddev->all_mddevs); |
| 286 | if (mddev->gendisk) { |
| 287 | /* we did a probe so need to clean up. |
| 288 | * Call schedule_work inside the spinlock |
| 289 | * so that flush_scheduled_work() after |
| 290 | * mddev_find will succeed in waiting for the |
| 291 | * work to be done. |
| 292 | */ |
| 293 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); |
| 294 | schedule_work(&mddev->del_work); |
| 295 | } else |
| 296 | kfree(mddev); |
| 297 | } |
| 298 | spin_unlock(&all_mddevs_lock); |
| 299 | } |
| 300 | |
| 301 | static mddev_t * mddev_find(dev_t unit) |
| 302 | { |
| 303 | mddev_t *mddev, *new = NULL; |
| 304 | |
| 305 | retry: |
| 306 | spin_lock(&all_mddevs_lock); |
| 307 | |
| 308 | if (unit) { |
| 309 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) |
| 310 | if (mddev->unit == unit) { |
| 311 | mddev_get(mddev); |
| 312 | spin_unlock(&all_mddevs_lock); |
| 313 | kfree(new); |
| 314 | return mddev; |
| 315 | } |
| 316 | |
| 317 | if (new) { |
| 318 | list_add(&new->all_mddevs, &all_mddevs); |
| 319 | spin_unlock(&all_mddevs_lock); |
| 320 | new->hold_active = UNTIL_IOCTL; |
| 321 | return new; |
| 322 | } |
| 323 | } else if (new) { |
| 324 | /* find an unused unit number */ |
| 325 | static int next_minor = 512; |
| 326 | int start = next_minor; |
| 327 | int is_free = 0; |
| 328 | int dev = 0; |
| 329 | while (!is_free) { |
| 330 | dev = MKDEV(MD_MAJOR, next_minor); |
| 331 | next_minor++; |
| 332 | if (next_minor > MINORMASK) |
| 333 | next_minor = 0; |
| 334 | if (next_minor == start) { |
| 335 | /* Oh dear, all in use. */ |
| 336 | spin_unlock(&all_mddevs_lock); |
| 337 | kfree(new); |
| 338 | return NULL; |
| 339 | } |
| 340 | |
| 341 | is_free = 1; |
| 342 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) |
| 343 | if (mddev->unit == dev) { |
| 344 | is_free = 0; |
| 345 | break; |
| 346 | } |
| 347 | } |
| 348 | new->unit = dev; |
| 349 | new->md_minor = MINOR(dev); |
| 350 | new->hold_active = UNTIL_STOP; |
| 351 | list_add(&new->all_mddevs, &all_mddevs); |
| 352 | spin_unlock(&all_mddevs_lock); |
| 353 | return new; |
| 354 | } |
| 355 | spin_unlock(&all_mddevs_lock); |
| 356 | |
| 357 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
| 358 | if (!new) |
| 359 | return NULL; |
| 360 | |
| 361 | new->unit = unit; |
| 362 | if (MAJOR(unit) == MD_MAJOR) |
| 363 | new->md_minor = MINOR(unit); |
| 364 | else |
| 365 | new->md_minor = MINOR(unit) >> MdpMinorShift; |
| 366 | |
| 367 | mutex_init(&new->reconfig_mutex); |
| 368 | INIT_LIST_HEAD(&new->disks); |
| 369 | INIT_LIST_HEAD(&new->all_mddevs); |
| 370 | init_timer(&new->safemode_timer); |
| 371 | atomic_set(&new->active, 1); |
| 372 | atomic_set(&new->openers, 0); |
| 373 | atomic_set(&new->active_io, 0); |
| 374 | spin_lock_init(&new->write_lock); |
| 375 | init_waitqueue_head(&new->sb_wait); |
| 376 | init_waitqueue_head(&new->recovery_wait); |
| 377 | new->reshape_position = MaxSector; |
| 378 | new->resync_min = 0; |
| 379 | new->resync_max = MaxSector; |
| 380 | new->level = LEVEL_NONE; |
| 381 | |
| 382 | goto retry; |
| 383 | } |
| 384 | |
| 385 | static inline int mddev_lock(mddev_t * mddev) |
| 386 | { |
| 387 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
| 388 | } |
| 389 | |
| 390 | static inline int mddev_is_locked(mddev_t *mddev) |
| 391 | { |
| 392 | return mutex_is_locked(&mddev->reconfig_mutex); |
| 393 | } |
| 394 | |
| 395 | static inline int mddev_trylock(mddev_t * mddev) |
| 396 | { |
| 397 | return mutex_trylock(&mddev->reconfig_mutex); |
| 398 | } |
| 399 | |
| 400 | static inline void mddev_unlock(mddev_t * mddev) |
| 401 | { |
| 402 | mutex_unlock(&mddev->reconfig_mutex); |
| 403 | |
| 404 | md_wakeup_thread(mddev->thread); |
| 405 | } |
| 406 | |
| 407 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
| 408 | { |
| 409 | mdk_rdev_t *rdev; |
| 410 | |
| 411 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 412 | if (rdev->desc_nr == nr) |
| 413 | return rdev; |
| 414 | |
| 415 | return NULL; |
| 416 | } |
| 417 | |
| 418 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) |
| 419 | { |
| 420 | mdk_rdev_t *rdev; |
| 421 | |
| 422 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 423 | if (rdev->bdev->bd_dev == dev) |
| 424 | return rdev; |
| 425 | |
| 426 | return NULL; |
| 427 | } |
| 428 | |
| 429 | static struct mdk_personality *find_pers(int level, char *clevel) |
| 430 | { |
| 431 | struct mdk_personality *pers; |
| 432 | list_for_each_entry(pers, &pers_list, list) { |
| 433 | if (level != LEVEL_NONE && pers->level == level) |
| 434 | return pers; |
| 435 | if (strcmp(pers->name, clevel)==0) |
| 436 | return pers; |
| 437 | } |
| 438 | return NULL; |
| 439 | } |
| 440 | |
| 441 | /* return the offset of the super block in 512byte sectors */ |
| 442 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
| 443 | { |
| 444 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
| 445 | return MD_NEW_SIZE_SECTORS(num_sectors); |
| 446 | } |
| 447 | |
| 448 | static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size) |
| 449 | { |
| 450 | sector_t num_sectors = rdev->sb_start; |
| 451 | |
| 452 | if (chunk_size) |
| 453 | num_sectors &= ~((sector_t)chunk_size/512 - 1); |
| 454 | return num_sectors; |
| 455 | } |
| 456 | |
| 457 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
| 458 | { |
| 459 | if (rdev->sb_page) |
| 460 | MD_BUG(); |
| 461 | |
| 462 | rdev->sb_page = alloc_page(GFP_KERNEL); |
| 463 | if (!rdev->sb_page) { |
| 464 | printk(KERN_ALERT "md: out of memory.\n"); |
| 465 | return -ENOMEM; |
| 466 | } |
| 467 | |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | static void free_disk_sb(mdk_rdev_t * rdev) |
| 472 | { |
| 473 | if (rdev->sb_page) { |
| 474 | put_page(rdev->sb_page); |
| 475 | rdev->sb_loaded = 0; |
| 476 | rdev->sb_page = NULL; |
| 477 | rdev->sb_start = 0; |
| 478 | rdev->sectors = 0; |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | |
| 483 | static void super_written(struct bio *bio, int error) |
| 484 | { |
| 485 | mdk_rdev_t *rdev = bio->bi_private; |
| 486 | mddev_t *mddev = rdev->mddev; |
| 487 | |
| 488 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
| 489 | printk("md: super_written gets error=%d, uptodate=%d\n", |
| 490 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); |
| 491 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); |
| 492 | md_error(mddev, rdev); |
| 493 | } |
| 494 | |
| 495 | if (atomic_dec_and_test(&mddev->pending_writes)) |
| 496 | wake_up(&mddev->sb_wait); |
| 497 | bio_put(bio); |
| 498 | } |
| 499 | |
| 500 | static void super_written_barrier(struct bio *bio, int error) |
| 501 | { |
| 502 | struct bio *bio2 = bio->bi_private; |
| 503 | mdk_rdev_t *rdev = bio2->bi_private; |
| 504 | mddev_t *mddev = rdev->mddev; |
| 505 | |
| 506 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && |
| 507 | error == -EOPNOTSUPP) { |
| 508 | unsigned long flags; |
| 509 | /* barriers don't appear to be supported :-( */ |
| 510 | set_bit(BarriersNotsupp, &rdev->flags); |
| 511 | mddev->barriers_work = 0; |
| 512 | spin_lock_irqsave(&mddev->write_lock, flags); |
| 513 | bio2->bi_next = mddev->biolist; |
| 514 | mddev->biolist = bio2; |
| 515 | spin_unlock_irqrestore(&mddev->write_lock, flags); |
| 516 | wake_up(&mddev->sb_wait); |
| 517 | bio_put(bio); |
| 518 | } else { |
| 519 | bio_put(bio2); |
| 520 | bio->bi_private = rdev; |
| 521 | super_written(bio, error); |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
| 526 | sector_t sector, int size, struct page *page) |
| 527 | { |
| 528 | /* write first size bytes of page to sector of rdev |
| 529 | * Increment mddev->pending_writes before returning |
| 530 | * and decrement it on completion, waking up sb_wait |
| 531 | * if zero is reached. |
| 532 | * If an error occurred, call md_error |
| 533 | * |
| 534 | * As we might need to resubmit the request if BIO_RW_BARRIER |
| 535 | * causes ENOTSUPP, we allocate a spare bio... |
| 536 | */ |
| 537 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
| 538 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); |
| 539 | |
| 540 | bio->bi_bdev = rdev->bdev; |
| 541 | bio->bi_sector = sector; |
| 542 | bio_add_page(bio, page, size, 0); |
| 543 | bio->bi_private = rdev; |
| 544 | bio->bi_end_io = super_written; |
| 545 | bio->bi_rw = rw; |
| 546 | |
| 547 | atomic_inc(&mddev->pending_writes); |
| 548 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
| 549 | struct bio *rbio; |
| 550 | rw |= (1<<BIO_RW_BARRIER); |
| 551 | rbio = bio_clone(bio, GFP_NOIO); |
| 552 | rbio->bi_private = bio; |
| 553 | rbio->bi_end_io = super_written_barrier; |
| 554 | submit_bio(rw, rbio); |
| 555 | } else |
| 556 | submit_bio(rw, bio); |
| 557 | } |
| 558 | |
| 559 | void md_super_wait(mddev_t *mddev) |
| 560 | { |
| 561 | /* wait for all superblock writes that were scheduled to complete. |
| 562 | * if any had to be retried (due to BARRIER problems), retry them |
| 563 | */ |
| 564 | DEFINE_WAIT(wq); |
| 565 | for(;;) { |
| 566 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); |
| 567 | if (atomic_read(&mddev->pending_writes)==0) |
| 568 | break; |
| 569 | while (mddev->biolist) { |
| 570 | struct bio *bio; |
| 571 | spin_lock_irq(&mddev->write_lock); |
| 572 | bio = mddev->biolist; |
| 573 | mddev->biolist = bio->bi_next ; |
| 574 | bio->bi_next = NULL; |
| 575 | spin_unlock_irq(&mddev->write_lock); |
| 576 | submit_bio(bio->bi_rw, bio); |
| 577 | } |
| 578 | schedule(); |
| 579 | } |
| 580 | finish_wait(&mddev->sb_wait, &wq); |
| 581 | } |
| 582 | |
| 583 | static void bi_complete(struct bio *bio, int error) |
| 584 | { |
| 585 | complete((struct completion*)bio->bi_private); |
| 586 | } |
| 587 | |
| 588 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
| 589 | struct page *page, int rw) |
| 590 | { |
| 591 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
| 592 | struct completion event; |
| 593 | int ret; |
| 594 | |
| 595 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
| 596 | |
| 597 | bio->bi_bdev = bdev; |
| 598 | bio->bi_sector = sector; |
| 599 | bio_add_page(bio, page, size, 0); |
| 600 | init_completion(&event); |
| 601 | bio->bi_private = &event; |
| 602 | bio->bi_end_io = bi_complete; |
| 603 | submit_bio(rw, bio); |
| 604 | wait_for_completion(&event); |
| 605 | |
| 606 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); |
| 607 | bio_put(bio); |
| 608 | return ret; |
| 609 | } |
| 610 | EXPORT_SYMBOL_GPL(sync_page_io); |
| 611 | |
| 612 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
| 613 | { |
| 614 | char b[BDEVNAME_SIZE]; |
| 615 | if (!rdev->sb_page) { |
| 616 | MD_BUG(); |
| 617 | return -EINVAL; |
| 618 | } |
| 619 | if (rdev->sb_loaded) |
| 620 | return 0; |
| 621 | |
| 622 | |
| 623 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
| 624 | goto fail; |
| 625 | rdev->sb_loaded = 1; |
| 626 | return 0; |
| 627 | |
| 628 | fail: |
| 629 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", |
| 630 | bdevname(rdev->bdev,b)); |
| 631 | return -EINVAL; |
| 632 | } |
| 633 | |
| 634 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
| 635 | { |
| 636 | return sb1->set_uuid0 == sb2->set_uuid0 && |
| 637 | sb1->set_uuid1 == sb2->set_uuid1 && |
| 638 | sb1->set_uuid2 == sb2->set_uuid2 && |
| 639 | sb1->set_uuid3 == sb2->set_uuid3; |
| 640 | } |
| 641 | |
| 642 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
| 643 | { |
| 644 | int ret; |
| 645 | mdp_super_t *tmp1, *tmp2; |
| 646 | |
| 647 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); |
| 648 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); |
| 649 | |
| 650 | if (!tmp1 || !tmp2) { |
| 651 | ret = 0; |
| 652 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
| 653 | goto abort; |
| 654 | } |
| 655 | |
| 656 | *tmp1 = *sb1; |
| 657 | *tmp2 = *sb2; |
| 658 | |
| 659 | /* |
| 660 | * nr_disks is not constant |
| 661 | */ |
| 662 | tmp1->nr_disks = 0; |
| 663 | tmp2->nr_disks = 0; |
| 664 | |
| 665 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
| 666 | abort: |
| 667 | kfree(tmp1); |
| 668 | kfree(tmp2); |
| 669 | return ret; |
| 670 | } |
| 671 | |
| 672 | |
| 673 | static u32 md_csum_fold(u32 csum) |
| 674 | { |
| 675 | csum = (csum & 0xffff) + (csum >> 16); |
| 676 | return (csum & 0xffff) + (csum >> 16); |
| 677 | } |
| 678 | |
| 679 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
| 680 | { |
| 681 | u64 newcsum = 0; |
| 682 | u32 *sb32 = (u32*)sb; |
| 683 | int i; |
| 684 | unsigned int disk_csum, csum; |
| 685 | |
| 686 | disk_csum = sb->sb_csum; |
| 687 | sb->sb_csum = 0; |
| 688 | |
| 689 | for (i = 0; i < MD_SB_BYTES/4 ; i++) |
| 690 | newcsum += sb32[i]; |
| 691 | csum = (newcsum & 0xffffffff) + (newcsum>>32); |
| 692 | |
| 693 | |
| 694 | #ifdef CONFIG_ALPHA |
| 695 | /* This used to use csum_partial, which was wrong for several |
| 696 | * reasons including that different results are returned on |
| 697 | * different architectures. It isn't critical that we get exactly |
| 698 | * the same return value as before (we always csum_fold before |
| 699 | * testing, and that removes any differences). However as we |
| 700 | * know that csum_partial always returned a 16bit value on |
| 701 | * alphas, do a fold to maximise conformity to previous behaviour. |
| 702 | */ |
| 703 | sb->sb_csum = md_csum_fold(disk_csum); |
| 704 | #else |
| 705 | sb->sb_csum = disk_csum; |
| 706 | #endif |
| 707 | return csum; |
| 708 | } |
| 709 | |
| 710 | |
| 711 | /* |
| 712 | * Handle superblock details. |
| 713 | * We want to be able to handle multiple superblock formats |
| 714 | * so we have a common interface to them all, and an array of |
| 715 | * different handlers. |
| 716 | * We rely on user-space to write the initial superblock, and support |
| 717 | * reading and updating of superblocks. |
| 718 | * Interface methods are: |
| 719 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) |
| 720 | * loads and validates a superblock on dev. |
| 721 | * if refdev != NULL, compare superblocks on both devices |
| 722 | * Return: |
| 723 | * 0 - dev has a superblock that is compatible with refdev |
| 724 | * 1 - dev has a superblock that is compatible and newer than refdev |
| 725 | * so dev should be used as the refdev in future |
| 726 | * -EINVAL superblock incompatible or invalid |
| 727 | * -othererror e.g. -EIO |
| 728 | * |
| 729 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) |
| 730 | * Verify that dev is acceptable into mddev. |
| 731 | * The first time, mddev->raid_disks will be 0, and data from |
| 732 | * dev should be merged in. Subsequent calls check that dev |
| 733 | * is new enough. Return 0 or -EINVAL |
| 734 | * |
| 735 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) |
| 736 | * Update the superblock for rdev with data in mddev |
| 737 | * This does not write to disc. |
| 738 | * |
| 739 | */ |
| 740 | |
| 741 | struct super_type { |
| 742 | char *name; |
| 743 | struct module *owner; |
| 744 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, |
| 745 | int minor_version); |
| 746 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); |
| 747 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); |
| 748 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, |
| 749 | sector_t num_sectors); |
| 750 | }; |
| 751 | |
| 752 | /* |
| 753 | * load_super for 0.90.0 |
| 754 | */ |
| 755 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) |
| 756 | { |
| 757 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| 758 | mdp_super_t *sb; |
| 759 | int ret; |
| 760 | |
| 761 | /* |
| 762 | * Calculate the position of the superblock (512byte sectors), |
| 763 | * it's at the end of the disk. |
| 764 | * |
| 765 | * It also happens to be a multiple of 4Kb. |
| 766 | */ |
| 767 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
| 768 | |
| 769 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
| 770 | if (ret) return ret; |
| 771 | |
| 772 | ret = -EINVAL; |
| 773 | |
| 774 | bdevname(rdev->bdev, b); |
| 775 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
| 776 | |
| 777 | if (sb->md_magic != MD_SB_MAGIC) { |
| 778 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", |
| 779 | b); |
| 780 | goto abort; |
| 781 | } |
| 782 | |
| 783 | if (sb->major_version != 0 || |
| 784 | sb->minor_version < 90 || |
| 785 | sb->minor_version > 91) { |
| 786 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
| 787 | sb->major_version, sb->minor_version, |
| 788 | b); |
| 789 | goto abort; |
| 790 | } |
| 791 | |
| 792 | if (sb->raid_disks <= 0) |
| 793 | goto abort; |
| 794 | |
| 795 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
| 796 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
| 797 | b); |
| 798 | goto abort; |
| 799 | } |
| 800 | |
| 801 | rdev->preferred_minor = sb->md_minor; |
| 802 | rdev->data_offset = 0; |
| 803 | rdev->sb_size = MD_SB_BYTES; |
| 804 | |
| 805 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) { |
| 806 | if (sb->level != 1 && sb->level != 4 |
| 807 | && sb->level != 5 && sb->level != 6 |
| 808 | && sb->level != 10) { |
| 809 | /* FIXME use a better test */ |
| 810 | printk(KERN_WARNING |
| 811 | "md: bitmaps not supported for this level.\n"); |
| 812 | goto abort; |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | if (sb->level == LEVEL_MULTIPATH) |
| 817 | rdev->desc_nr = -1; |
| 818 | else |
| 819 | rdev->desc_nr = sb->this_disk.number; |
| 820 | |
| 821 | if (!refdev) { |
| 822 | ret = 1; |
| 823 | } else { |
| 824 | __u64 ev1, ev2; |
| 825 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); |
| 826 | if (!uuid_equal(refsb, sb)) { |
| 827 | printk(KERN_WARNING "md: %s has different UUID to %s\n", |
| 828 | b, bdevname(refdev->bdev,b2)); |
| 829 | goto abort; |
| 830 | } |
| 831 | if (!sb_equal(refsb, sb)) { |
| 832 | printk(KERN_WARNING "md: %s has same UUID" |
| 833 | " but different superblock to %s\n", |
| 834 | b, bdevname(refdev->bdev, b2)); |
| 835 | goto abort; |
| 836 | } |
| 837 | ev1 = md_event(sb); |
| 838 | ev2 = md_event(refsb); |
| 839 | if (ev1 > ev2) |
| 840 | ret = 1; |
| 841 | else |
| 842 | ret = 0; |
| 843 | } |
| 844 | rdev->sectors = calc_num_sectors(rdev, sb->chunk_size); |
| 845 | |
| 846 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
| 847 | /* "this cannot possibly happen" ... */ |
| 848 | ret = -EINVAL; |
| 849 | |
| 850 | abort: |
| 851 | return ret; |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * validate_super for 0.90.0 |
| 856 | */ |
| 857 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) |
| 858 | { |
| 859 | mdp_disk_t *desc; |
| 860 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); |
| 861 | __u64 ev1 = md_event(sb); |
| 862 | |
| 863 | rdev->raid_disk = -1; |
| 864 | clear_bit(Faulty, &rdev->flags); |
| 865 | clear_bit(In_sync, &rdev->flags); |
| 866 | clear_bit(WriteMostly, &rdev->flags); |
| 867 | clear_bit(BarriersNotsupp, &rdev->flags); |
| 868 | |
| 869 | if (mddev->raid_disks == 0) { |
| 870 | mddev->major_version = 0; |
| 871 | mddev->minor_version = sb->minor_version; |
| 872 | mddev->patch_version = sb->patch_version; |
| 873 | mddev->external = 0; |
| 874 | mddev->chunk_size = sb->chunk_size; |
| 875 | mddev->ctime = sb->ctime; |
| 876 | mddev->utime = sb->utime; |
| 877 | mddev->level = sb->level; |
| 878 | mddev->clevel[0] = 0; |
| 879 | mddev->layout = sb->layout; |
| 880 | mddev->raid_disks = sb->raid_disks; |
| 881 | mddev->dev_sectors = sb->size * 2; |
| 882 | mddev->events = ev1; |
| 883 | mddev->bitmap_offset = 0; |
| 884 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
| 885 | |
| 886 | if (mddev->minor_version >= 91) { |
| 887 | mddev->reshape_position = sb->reshape_position; |
| 888 | mddev->delta_disks = sb->delta_disks; |
| 889 | mddev->new_level = sb->new_level; |
| 890 | mddev->new_layout = sb->new_layout; |
| 891 | mddev->new_chunk = sb->new_chunk; |
| 892 | } else { |
| 893 | mddev->reshape_position = MaxSector; |
| 894 | mddev->delta_disks = 0; |
| 895 | mddev->new_level = mddev->level; |
| 896 | mddev->new_layout = mddev->layout; |
| 897 | mddev->new_chunk = mddev->chunk_size; |
| 898 | } |
| 899 | |
| 900 | if (sb->state & (1<<MD_SB_CLEAN)) |
| 901 | mddev->recovery_cp = MaxSector; |
| 902 | else { |
| 903 | if (sb->events_hi == sb->cp_events_hi && |
| 904 | sb->events_lo == sb->cp_events_lo) { |
| 905 | mddev->recovery_cp = sb->recovery_cp; |
| 906 | } else |
| 907 | mddev->recovery_cp = 0; |
| 908 | } |
| 909 | |
| 910 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); |
| 911 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); |
| 912 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); |
| 913 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); |
| 914 | |
| 915 | mddev->max_disks = MD_SB_DISKS; |
| 916 | |
| 917 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && |
| 918 | mddev->bitmap_file == NULL) |
| 919 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
| 920 | |
| 921 | } else if (mddev->pers == NULL) { |
| 922 | /* Insist on good event counter while assembling */ |
| 923 | ++ev1; |
| 924 | if (ev1 < mddev->events) |
| 925 | return -EINVAL; |
| 926 | } else if (mddev->bitmap) { |
| 927 | /* if adding to array with a bitmap, then we can accept an |
| 928 | * older device ... but not too old. |
| 929 | */ |
| 930 | if (ev1 < mddev->bitmap->events_cleared) |
| 931 | return 0; |
| 932 | } else { |
| 933 | if (ev1 < mddev->events) |
| 934 | /* just a hot-add of a new device, leave raid_disk at -1 */ |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | if (mddev->level != LEVEL_MULTIPATH) { |
| 939 | desc = sb->disks + rdev->desc_nr; |
| 940 | |
| 941 | if (desc->state & (1<<MD_DISK_FAULTY)) |
| 942 | set_bit(Faulty, &rdev->flags); |
| 943 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
| 944 | desc->raid_disk < mddev->raid_disks */) { |
| 945 | set_bit(In_sync, &rdev->flags); |
| 946 | rdev->raid_disk = desc->raid_disk; |
| 947 | } |
| 948 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
| 949 | set_bit(WriteMostly, &rdev->flags); |
| 950 | } else /* MULTIPATH are always insync */ |
| 951 | set_bit(In_sync, &rdev->flags); |
| 952 | return 0; |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | * sync_super for 0.90.0 |
| 957 | */ |
| 958 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) |
| 959 | { |
| 960 | mdp_super_t *sb; |
| 961 | mdk_rdev_t *rdev2; |
| 962 | int next_spare = mddev->raid_disks; |
| 963 | |
| 964 | |
| 965 | /* make rdev->sb match mddev data.. |
| 966 | * |
| 967 | * 1/ zero out disks |
| 968 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); |
| 969 | * 3/ any empty disks < next_spare become removed |
| 970 | * |
| 971 | * disks[0] gets initialised to REMOVED because |
| 972 | * we cannot be sure from other fields if it has |
| 973 | * been initialised or not. |
| 974 | */ |
| 975 | int i; |
| 976 | int active=0, working=0,failed=0,spare=0,nr_disks=0; |
| 977 | |
| 978 | rdev->sb_size = MD_SB_BYTES; |
| 979 | |
| 980 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
| 981 | |
| 982 | memset(sb, 0, sizeof(*sb)); |
| 983 | |
| 984 | sb->md_magic = MD_SB_MAGIC; |
| 985 | sb->major_version = mddev->major_version; |
| 986 | sb->patch_version = mddev->patch_version; |
| 987 | sb->gvalid_words = 0; /* ignored */ |
| 988 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); |
| 989 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); |
| 990 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); |
| 991 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); |
| 992 | |
| 993 | sb->ctime = mddev->ctime; |
| 994 | sb->level = mddev->level; |
| 995 | sb->size = mddev->dev_sectors / 2; |
| 996 | sb->raid_disks = mddev->raid_disks; |
| 997 | sb->md_minor = mddev->md_minor; |
| 998 | sb->not_persistent = 0; |
| 999 | sb->utime = mddev->utime; |
| 1000 | sb->state = 0; |
| 1001 | sb->events_hi = (mddev->events>>32); |
| 1002 | sb->events_lo = (u32)mddev->events; |
| 1003 | |
| 1004 | if (mddev->reshape_position == MaxSector) |
| 1005 | sb->minor_version = 90; |
| 1006 | else { |
| 1007 | sb->minor_version = 91; |
| 1008 | sb->reshape_position = mddev->reshape_position; |
| 1009 | sb->new_level = mddev->new_level; |
| 1010 | sb->delta_disks = mddev->delta_disks; |
| 1011 | sb->new_layout = mddev->new_layout; |
| 1012 | sb->new_chunk = mddev->new_chunk; |
| 1013 | } |
| 1014 | mddev->minor_version = sb->minor_version; |
| 1015 | if (mddev->in_sync) |
| 1016 | { |
| 1017 | sb->recovery_cp = mddev->recovery_cp; |
| 1018 | sb->cp_events_hi = (mddev->events>>32); |
| 1019 | sb->cp_events_lo = (u32)mddev->events; |
| 1020 | if (mddev->recovery_cp == MaxSector) |
| 1021 | sb->state = (1<< MD_SB_CLEAN); |
| 1022 | } else |
| 1023 | sb->recovery_cp = 0; |
| 1024 | |
| 1025 | sb->layout = mddev->layout; |
| 1026 | sb->chunk_size = mddev->chunk_size; |
| 1027 | |
| 1028 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
| 1029 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
| 1030 | |
| 1031 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
| 1032 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
| 1033 | mdp_disk_t *d; |
| 1034 | int desc_nr; |
| 1035 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
| 1036 | && !test_bit(Faulty, &rdev2->flags)) |
| 1037 | desc_nr = rdev2->raid_disk; |
| 1038 | else |
| 1039 | desc_nr = next_spare++; |
| 1040 | rdev2->desc_nr = desc_nr; |
| 1041 | d = &sb->disks[rdev2->desc_nr]; |
| 1042 | nr_disks++; |
| 1043 | d->number = rdev2->desc_nr; |
| 1044 | d->major = MAJOR(rdev2->bdev->bd_dev); |
| 1045 | d->minor = MINOR(rdev2->bdev->bd_dev); |
| 1046 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
| 1047 | && !test_bit(Faulty, &rdev2->flags)) |
| 1048 | d->raid_disk = rdev2->raid_disk; |
| 1049 | else |
| 1050 | d->raid_disk = rdev2->desc_nr; /* compatibility */ |
| 1051 | if (test_bit(Faulty, &rdev2->flags)) |
| 1052 | d->state = (1<<MD_DISK_FAULTY); |
| 1053 | else if (test_bit(In_sync, &rdev2->flags)) { |
| 1054 | d->state = (1<<MD_DISK_ACTIVE); |
| 1055 | d->state |= (1<<MD_DISK_SYNC); |
| 1056 | active++; |
| 1057 | working++; |
| 1058 | } else { |
| 1059 | d->state = 0; |
| 1060 | spare++; |
| 1061 | working++; |
| 1062 | } |
| 1063 | if (test_bit(WriteMostly, &rdev2->flags)) |
| 1064 | d->state |= (1<<MD_DISK_WRITEMOSTLY); |
| 1065 | } |
| 1066 | /* now set the "removed" and "faulty" bits on any missing devices */ |
| 1067 | for (i=0 ; i < mddev->raid_disks ; i++) { |
| 1068 | mdp_disk_t *d = &sb->disks[i]; |
| 1069 | if (d->state == 0 && d->number == 0) { |
| 1070 | d->number = i; |
| 1071 | d->raid_disk = i; |
| 1072 | d->state = (1<<MD_DISK_REMOVED); |
| 1073 | d->state |= (1<<MD_DISK_FAULTY); |
| 1074 | failed++; |
| 1075 | } |
| 1076 | } |
| 1077 | sb->nr_disks = nr_disks; |
| 1078 | sb->active_disks = active; |
| 1079 | sb->working_disks = working; |
| 1080 | sb->failed_disks = failed; |
| 1081 | sb->spare_disks = spare; |
| 1082 | |
| 1083 | sb->this_disk = sb->disks[rdev->desc_nr]; |
| 1084 | sb->sb_csum = calc_sb_csum(sb); |
| 1085 | } |
| 1086 | |
| 1087 | /* |
| 1088 | * rdev_size_change for 0.90.0 |
| 1089 | */ |
| 1090 | static unsigned long long |
| 1091 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
| 1092 | { |
| 1093 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
| 1094 | return 0; /* component must fit device */ |
| 1095 | if (rdev->mddev->bitmap_offset) |
| 1096 | return 0; /* can't move bitmap */ |
| 1097 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
| 1098 | if (!num_sectors || num_sectors > rdev->sb_start) |
| 1099 | num_sectors = rdev->sb_start; |
| 1100 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
| 1101 | rdev->sb_page); |
| 1102 | md_super_wait(rdev->mddev); |
| 1103 | return num_sectors / 2; /* kB for sysfs */ |
| 1104 | } |
| 1105 | |
| 1106 | |
| 1107 | /* |
| 1108 | * version 1 superblock |
| 1109 | */ |
| 1110 | |
| 1111 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
| 1112 | { |
| 1113 | __le32 disk_csum; |
| 1114 | u32 csum; |
| 1115 | unsigned long long newcsum; |
| 1116 | int size = 256 + le32_to_cpu(sb->max_dev)*2; |
| 1117 | __le32 *isuper = (__le32*)sb; |
| 1118 | int i; |
| 1119 | |
| 1120 | disk_csum = sb->sb_csum; |
| 1121 | sb->sb_csum = 0; |
| 1122 | newcsum = 0; |
| 1123 | for (i=0; size>=4; size -= 4 ) |
| 1124 | newcsum += le32_to_cpu(*isuper++); |
| 1125 | |
| 1126 | if (size == 2) |
| 1127 | newcsum += le16_to_cpu(*(__le16*) isuper); |
| 1128 | |
| 1129 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); |
| 1130 | sb->sb_csum = disk_csum; |
| 1131 | return cpu_to_le32(csum); |
| 1132 | } |
| 1133 | |
| 1134 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) |
| 1135 | { |
| 1136 | struct mdp_superblock_1 *sb; |
| 1137 | int ret; |
| 1138 | sector_t sb_start; |
| 1139 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| 1140 | int bmask; |
| 1141 | |
| 1142 | /* |
| 1143 | * Calculate the position of the superblock in 512byte sectors. |
| 1144 | * It is always aligned to a 4K boundary and |
| 1145 | * depeding on minor_version, it can be: |
| 1146 | * 0: At least 8K, but less than 12K, from end of device |
| 1147 | * 1: At start of device |
| 1148 | * 2: 4K from start of device. |
| 1149 | */ |
| 1150 | switch(minor_version) { |
| 1151 | case 0: |
| 1152 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
| 1153 | sb_start -= 8*2; |
| 1154 | sb_start &= ~(sector_t)(4*2-1); |
| 1155 | break; |
| 1156 | case 1: |
| 1157 | sb_start = 0; |
| 1158 | break; |
| 1159 | case 2: |
| 1160 | sb_start = 8; |
| 1161 | break; |
| 1162 | default: |
| 1163 | return -EINVAL; |
| 1164 | } |
| 1165 | rdev->sb_start = sb_start; |
| 1166 | |
| 1167 | /* superblock is rarely larger than 1K, but it can be larger, |
| 1168 | * and it is safe to read 4k, so we do that |
| 1169 | */ |
| 1170 | ret = read_disk_sb(rdev, 4096); |
| 1171 | if (ret) return ret; |
| 1172 | |
| 1173 | |
| 1174 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); |
| 1175 | |
| 1176 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || |
| 1177 | sb->major_version != cpu_to_le32(1) || |
| 1178 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || |
| 1179 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
| 1180 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
| 1181 | return -EINVAL; |
| 1182 | |
| 1183 | if (calc_sb_1_csum(sb) != sb->sb_csum) { |
| 1184 | printk("md: invalid superblock checksum on %s\n", |
| 1185 | bdevname(rdev->bdev,b)); |
| 1186 | return -EINVAL; |
| 1187 | } |
| 1188 | if (le64_to_cpu(sb->data_size) < 10) { |
| 1189 | printk("md: data_size too small on %s\n", |
| 1190 | bdevname(rdev->bdev,b)); |
| 1191 | return -EINVAL; |
| 1192 | } |
| 1193 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) { |
| 1194 | if (sb->level != cpu_to_le32(1) && |
| 1195 | sb->level != cpu_to_le32(4) && |
| 1196 | sb->level != cpu_to_le32(5) && |
| 1197 | sb->level != cpu_to_le32(6) && |
| 1198 | sb->level != cpu_to_le32(10)) { |
| 1199 | printk(KERN_WARNING |
| 1200 | "md: bitmaps not supported for this level.\n"); |
| 1201 | return -EINVAL; |
| 1202 | } |
| 1203 | } |
| 1204 | |
| 1205 | rdev->preferred_minor = 0xffff; |
| 1206 | rdev->data_offset = le64_to_cpu(sb->data_offset); |
| 1207 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
| 1208 | |
| 1209 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
| 1210 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
| 1211 | if (rdev->sb_size & bmask) |
| 1212 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
| 1213 | |
| 1214 | if (minor_version |
| 1215 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
| 1216 | return -EINVAL; |
| 1217 | |
| 1218 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
| 1219 | rdev->desc_nr = -1; |
| 1220 | else |
| 1221 | rdev->desc_nr = le32_to_cpu(sb->dev_number); |
| 1222 | |
| 1223 | if (!refdev) { |
| 1224 | ret = 1; |
| 1225 | } else { |
| 1226 | __u64 ev1, ev2; |
| 1227 | struct mdp_superblock_1 *refsb = |
| 1228 | (struct mdp_superblock_1*)page_address(refdev->sb_page); |
| 1229 | |
| 1230 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || |
| 1231 | sb->level != refsb->level || |
| 1232 | sb->layout != refsb->layout || |
| 1233 | sb->chunksize != refsb->chunksize) { |
| 1234 | printk(KERN_WARNING "md: %s has strangely different" |
| 1235 | " superblock to %s\n", |
| 1236 | bdevname(rdev->bdev,b), |
| 1237 | bdevname(refdev->bdev,b2)); |
| 1238 | return -EINVAL; |
| 1239 | } |
| 1240 | ev1 = le64_to_cpu(sb->events); |
| 1241 | ev2 = le64_to_cpu(refsb->events); |
| 1242 | |
| 1243 | if (ev1 > ev2) |
| 1244 | ret = 1; |
| 1245 | else |
| 1246 | ret = 0; |
| 1247 | } |
| 1248 | if (minor_version) |
| 1249 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
| 1250 | le64_to_cpu(sb->data_offset); |
| 1251 | else |
| 1252 | rdev->sectors = rdev->sb_start; |
| 1253 | if (rdev->sectors < le64_to_cpu(sb->data_size)) |
| 1254 | return -EINVAL; |
| 1255 | rdev->sectors = le64_to_cpu(sb->data_size); |
| 1256 | if (le32_to_cpu(sb->chunksize)) |
| 1257 | rdev->sectors &= ~((sector_t)le32_to_cpu(sb->chunksize) - 1); |
| 1258 | |
| 1259 | if (le64_to_cpu(sb->size) > rdev->sectors) |
| 1260 | return -EINVAL; |
| 1261 | return ret; |
| 1262 | } |
| 1263 | |
| 1264 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) |
| 1265 | { |
| 1266 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); |
| 1267 | __u64 ev1 = le64_to_cpu(sb->events); |
| 1268 | |
| 1269 | rdev->raid_disk = -1; |
| 1270 | clear_bit(Faulty, &rdev->flags); |
| 1271 | clear_bit(In_sync, &rdev->flags); |
| 1272 | clear_bit(WriteMostly, &rdev->flags); |
| 1273 | clear_bit(BarriersNotsupp, &rdev->flags); |
| 1274 | |
| 1275 | if (mddev->raid_disks == 0) { |
| 1276 | mddev->major_version = 1; |
| 1277 | mddev->patch_version = 0; |
| 1278 | mddev->external = 0; |
| 1279 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; |
| 1280 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
| 1281 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); |
| 1282 | mddev->level = le32_to_cpu(sb->level); |
| 1283 | mddev->clevel[0] = 0; |
| 1284 | mddev->layout = le32_to_cpu(sb->layout); |
| 1285 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); |
| 1286 | mddev->dev_sectors = le64_to_cpu(sb->size); |
| 1287 | mddev->events = ev1; |
| 1288 | mddev->bitmap_offset = 0; |
| 1289 | mddev->default_bitmap_offset = 1024 >> 9; |
| 1290 | |
| 1291 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
| 1292 | memcpy(mddev->uuid, sb->set_uuid, 16); |
| 1293 | |
| 1294 | mddev->max_disks = (4096-256)/2; |
| 1295 | |
| 1296 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
| 1297 | mddev->bitmap_file == NULL ) |
| 1298 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); |
| 1299 | |
| 1300 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
| 1301 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); |
| 1302 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); |
| 1303 | mddev->new_level = le32_to_cpu(sb->new_level); |
| 1304 | mddev->new_layout = le32_to_cpu(sb->new_layout); |
| 1305 | mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9; |
| 1306 | } else { |
| 1307 | mddev->reshape_position = MaxSector; |
| 1308 | mddev->delta_disks = 0; |
| 1309 | mddev->new_level = mddev->level; |
| 1310 | mddev->new_layout = mddev->layout; |
| 1311 | mddev->new_chunk = mddev->chunk_size; |
| 1312 | } |
| 1313 | |
| 1314 | } else if (mddev->pers == NULL) { |
| 1315 | /* Insist of good event counter while assembling */ |
| 1316 | ++ev1; |
| 1317 | if (ev1 < mddev->events) |
| 1318 | return -EINVAL; |
| 1319 | } else if (mddev->bitmap) { |
| 1320 | /* If adding to array with a bitmap, then we can accept an |
| 1321 | * older device, but not too old. |
| 1322 | */ |
| 1323 | if (ev1 < mddev->bitmap->events_cleared) |
| 1324 | return 0; |
| 1325 | } else { |
| 1326 | if (ev1 < mddev->events) |
| 1327 | /* just a hot-add of a new device, leave raid_disk at -1 */ |
| 1328 | return 0; |
| 1329 | } |
| 1330 | if (mddev->level != LEVEL_MULTIPATH) { |
| 1331 | int role; |
| 1332 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); |
| 1333 | switch(role) { |
| 1334 | case 0xffff: /* spare */ |
| 1335 | break; |
| 1336 | case 0xfffe: /* faulty */ |
| 1337 | set_bit(Faulty, &rdev->flags); |
| 1338 | break; |
| 1339 | default: |
| 1340 | if ((le32_to_cpu(sb->feature_map) & |
| 1341 | MD_FEATURE_RECOVERY_OFFSET)) |
| 1342 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
| 1343 | else |
| 1344 | set_bit(In_sync, &rdev->flags); |
| 1345 | rdev->raid_disk = role; |
| 1346 | break; |
| 1347 | } |
| 1348 | if (sb->devflags & WriteMostly1) |
| 1349 | set_bit(WriteMostly, &rdev->flags); |
| 1350 | } else /* MULTIPATH are always insync */ |
| 1351 | set_bit(In_sync, &rdev->flags); |
| 1352 | |
| 1353 | return 0; |
| 1354 | } |
| 1355 | |
| 1356 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) |
| 1357 | { |
| 1358 | struct mdp_superblock_1 *sb; |
| 1359 | mdk_rdev_t *rdev2; |
| 1360 | int max_dev, i; |
| 1361 | /* make rdev->sb match mddev and rdev data. */ |
| 1362 | |
| 1363 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); |
| 1364 | |
| 1365 | sb->feature_map = 0; |
| 1366 | sb->pad0 = 0; |
| 1367 | sb->recovery_offset = cpu_to_le64(0); |
| 1368 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
| 1369 | memset(sb->pad2, 0, sizeof(sb->pad2)); |
| 1370 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
| 1371 | |
| 1372 | sb->utime = cpu_to_le64((__u64)mddev->utime); |
| 1373 | sb->events = cpu_to_le64(mddev->events); |
| 1374 | if (mddev->in_sync) |
| 1375 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); |
| 1376 | else |
| 1377 | sb->resync_offset = cpu_to_le64(0); |
| 1378 | |
| 1379 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
| 1380 | |
| 1381 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
| 1382 | sb->size = cpu_to_le64(mddev->dev_sectors); |
| 1383 | |
| 1384 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
| 1385 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); |
| 1386 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
| 1387 | } |
| 1388 | |
| 1389 | if (rdev->raid_disk >= 0 && |
| 1390 | !test_bit(In_sync, &rdev->flags)) { |
| 1391 | if (mddev->curr_resync_completed > rdev->recovery_offset) |
| 1392 | rdev->recovery_offset = mddev->curr_resync_completed; |
| 1393 | if (rdev->recovery_offset > 0) { |
| 1394 | sb->feature_map |= |
| 1395 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); |
| 1396 | sb->recovery_offset = |
| 1397 | cpu_to_le64(rdev->recovery_offset); |
| 1398 | } |
| 1399 | } |
| 1400 | |
| 1401 | if (mddev->reshape_position != MaxSector) { |
| 1402 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); |
| 1403 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); |
| 1404 | sb->new_layout = cpu_to_le32(mddev->new_layout); |
| 1405 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); |
| 1406 | sb->new_level = cpu_to_le32(mddev->new_level); |
| 1407 | sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9); |
| 1408 | } |
| 1409 | |
| 1410 | max_dev = 0; |
| 1411 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
| 1412 | if (rdev2->desc_nr+1 > max_dev) |
| 1413 | max_dev = rdev2->desc_nr+1; |
| 1414 | |
| 1415 | if (max_dev > le32_to_cpu(sb->max_dev)) |
| 1416 | sb->max_dev = cpu_to_le32(max_dev); |
| 1417 | for (i=0; i<max_dev;i++) |
| 1418 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
| 1419 | |
| 1420 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
| 1421 | i = rdev2->desc_nr; |
| 1422 | if (test_bit(Faulty, &rdev2->flags)) |
| 1423 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
| 1424 | else if (test_bit(In_sync, &rdev2->flags)) |
| 1425 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
| 1426 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
| 1427 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
| 1428 | else |
| 1429 | sb->dev_roles[i] = cpu_to_le16(0xffff); |
| 1430 | } |
| 1431 | |
| 1432 | sb->sb_csum = calc_sb_1_csum(sb); |
| 1433 | } |
| 1434 | |
| 1435 | static unsigned long long |
| 1436 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
| 1437 | { |
| 1438 | struct mdp_superblock_1 *sb; |
| 1439 | sector_t max_sectors; |
| 1440 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
| 1441 | return 0; /* component must fit device */ |
| 1442 | if (rdev->sb_start < rdev->data_offset) { |
| 1443 | /* minor versions 1 and 2; superblock before data */ |
| 1444 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
| 1445 | max_sectors -= rdev->data_offset; |
| 1446 | if (!num_sectors || num_sectors > max_sectors) |
| 1447 | num_sectors = max_sectors; |
| 1448 | } else if (rdev->mddev->bitmap_offset) { |
| 1449 | /* minor version 0 with bitmap we can't move */ |
| 1450 | return 0; |
| 1451 | } else { |
| 1452 | /* minor version 0; superblock after data */ |
| 1453 | sector_t sb_start; |
| 1454 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; |
| 1455 | sb_start &= ~(sector_t)(4*2 - 1); |
| 1456 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
| 1457 | if (!num_sectors || num_sectors > max_sectors) |
| 1458 | num_sectors = max_sectors; |
| 1459 | rdev->sb_start = sb_start; |
| 1460 | } |
| 1461 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); |
| 1462 | sb->data_size = cpu_to_le64(num_sectors); |
| 1463 | sb->super_offset = rdev->sb_start; |
| 1464 | sb->sb_csum = calc_sb_1_csum(sb); |
| 1465 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
| 1466 | rdev->sb_page); |
| 1467 | md_super_wait(rdev->mddev); |
| 1468 | return num_sectors / 2; /* kB for sysfs */ |
| 1469 | } |
| 1470 | |
| 1471 | static struct super_type super_types[] = { |
| 1472 | [0] = { |
| 1473 | .name = "0.90.0", |
| 1474 | .owner = THIS_MODULE, |
| 1475 | .load_super = super_90_load, |
| 1476 | .validate_super = super_90_validate, |
| 1477 | .sync_super = super_90_sync, |
| 1478 | .rdev_size_change = super_90_rdev_size_change, |
| 1479 | }, |
| 1480 | [1] = { |
| 1481 | .name = "md-1", |
| 1482 | .owner = THIS_MODULE, |
| 1483 | .load_super = super_1_load, |
| 1484 | .validate_super = super_1_validate, |
| 1485 | .sync_super = super_1_sync, |
| 1486 | .rdev_size_change = super_1_rdev_size_change, |
| 1487 | }, |
| 1488 | }; |
| 1489 | |
| 1490 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) |
| 1491 | { |
| 1492 | mdk_rdev_t *rdev, *rdev2; |
| 1493 | |
| 1494 | rcu_read_lock(); |
| 1495 | rdev_for_each_rcu(rdev, mddev1) |
| 1496 | rdev_for_each_rcu(rdev2, mddev2) |
| 1497 | if (rdev->bdev->bd_contains == |
| 1498 | rdev2->bdev->bd_contains) { |
| 1499 | rcu_read_unlock(); |
| 1500 | return 1; |
| 1501 | } |
| 1502 | rcu_read_unlock(); |
| 1503 | return 0; |
| 1504 | } |
| 1505 | |
| 1506 | static LIST_HEAD(pending_raid_disks); |
| 1507 | |
| 1508 | static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev) |
| 1509 | { |
| 1510 | struct mdk_personality *pers = mddev->pers; |
| 1511 | struct gendisk *disk = mddev->gendisk; |
| 1512 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
| 1513 | struct blk_integrity *bi_mddev = blk_get_integrity(disk); |
| 1514 | |
| 1515 | /* Data integrity passthrough not supported on RAID 4, 5 and 6 */ |
| 1516 | if (pers && pers->level >= 4 && pers->level <= 6) |
| 1517 | return; |
| 1518 | |
| 1519 | /* If rdev is integrity capable, register profile for mddev */ |
| 1520 | if (!bi_mddev && bi_rdev) { |
| 1521 | if (blk_integrity_register(disk, bi_rdev)) |
| 1522 | printk(KERN_ERR "%s: %s Could not register integrity!\n", |
| 1523 | __func__, disk->disk_name); |
| 1524 | else |
| 1525 | printk(KERN_NOTICE "Enabling data integrity on %s\n", |
| 1526 | disk->disk_name); |
| 1527 | return; |
| 1528 | } |
| 1529 | |
| 1530 | /* Check that mddev and rdev have matching profiles */ |
| 1531 | if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) { |
| 1532 | printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__, |
| 1533 | disk->disk_name, rdev->bdev->bd_disk->disk_name); |
| 1534 | printk(KERN_NOTICE "Disabling data integrity on %s\n", |
| 1535 | disk->disk_name); |
| 1536 | blk_integrity_unregister(disk); |
| 1537 | } |
| 1538 | } |
| 1539 | |
| 1540 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
| 1541 | { |
| 1542 | char b[BDEVNAME_SIZE]; |
| 1543 | struct kobject *ko; |
| 1544 | char *s; |
| 1545 | int err; |
| 1546 | |
| 1547 | if (rdev->mddev) { |
| 1548 | MD_BUG(); |
| 1549 | return -EINVAL; |
| 1550 | } |
| 1551 | |
| 1552 | /* prevent duplicates */ |
| 1553 | if (find_rdev(mddev, rdev->bdev->bd_dev)) |
| 1554 | return -EEXIST; |
| 1555 | |
| 1556 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
| 1557 | if (rdev->sectors && (mddev->dev_sectors == 0 || |
| 1558 | rdev->sectors < mddev->dev_sectors)) { |
| 1559 | if (mddev->pers) { |
| 1560 | /* Cannot change size, so fail |
| 1561 | * If mddev->level <= 0, then we don't care |
| 1562 | * about aligning sizes (e.g. linear) |
| 1563 | */ |
| 1564 | if (mddev->level > 0) |
| 1565 | return -ENOSPC; |
| 1566 | } else |
| 1567 | mddev->dev_sectors = rdev->sectors; |
| 1568 | } |
| 1569 | |
| 1570 | /* Verify rdev->desc_nr is unique. |
| 1571 | * If it is -1, assign a free number, else |
| 1572 | * check number is not in use |
| 1573 | */ |
| 1574 | if (rdev->desc_nr < 0) { |
| 1575 | int choice = 0; |
| 1576 | if (mddev->pers) choice = mddev->raid_disks; |
| 1577 | while (find_rdev_nr(mddev, choice)) |
| 1578 | choice++; |
| 1579 | rdev->desc_nr = choice; |
| 1580 | } else { |
| 1581 | if (find_rdev_nr(mddev, rdev->desc_nr)) |
| 1582 | return -EBUSY; |
| 1583 | } |
| 1584 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
| 1585 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", |
| 1586 | mdname(mddev), mddev->max_disks); |
| 1587 | return -EBUSY; |
| 1588 | } |
| 1589 | bdevname(rdev->bdev,b); |
| 1590 | while ( (s=strchr(b, '/')) != NULL) |
| 1591 | *s = '!'; |
| 1592 | |
| 1593 | rdev->mddev = mddev; |
| 1594 | printk(KERN_INFO "md: bind<%s>\n", b); |
| 1595 | |
| 1596 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
| 1597 | goto fail; |
| 1598 | |
| 1599 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
| 1600 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
| 1601 | kobject_del(&rdev->kobj); |
| 1602 | goto fail; |
| 1603 | } |
| 1604 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
| 1605 | |
| 1606 | list_add_rcu(&rdev->same_set, &mddev->disks); |
| 1607 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
| 1608 | |
| 1609 | /* May as well allow recovery to be retried once */ |
| 1610 | mddev->recovery_disabled = 0; |
| 1611 | |
| 1612 | md_integrity_check(rdev, mddev); |
| 1613 | return 0; |
| 1614 | |
| 1615 | fail: |
| 1616 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", |
| 1617 | b, mdname(mddev)); |
| 1618 | return err; |
| 1619 | } |
| 1620 | |
| 1621 | static void md_delayed_delete(struct work_struct *ws) |
| 1622 | { |
| 1623 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); |
| 1624 | kobject_del(&rdev->kobj); |
| 1625 | kobject_put(&rdev->kobj); |
| 1626 | } |
| 1627 | |
| 1628 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
| 1629 | { |
| 1630 | char b[BDEVNAME_SIZE]; |
| 1631 | if (!rdev->mddev) { |
| 1632 | MD_BUG(); |
| 1633 | return; |
| 1634 | } |
| 1635 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
| 1636 | list_del_rcu(&rdev->same_set); |
| 1637 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
| 1638 | rdev->mddev = NULL; |
| 1639 | sysfs_remove_link(&rdev->kobj, "block"); |
| 1640 | sysfs_put(rdev->sysfs_state); |
| 1641 | rdev->sysfs_state = NULL; |
| 1642 | /* We need to delay this, otherwise we can deadlock when |
| 1643 | * writing to 'remove' to "dev/state". We also need |
| 1644 | * to delay it due to rcu usage. |
| 1645 | */ |
| 1646 | synchronize_rcu(); |
| 1647 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
| 1648 | kobject_get(&rdev->kobj); |
| 1649 | schedule_work(&rdev->del_work); |
| 1650 | } |
| 1651 | |
| 1652 | /* |
| 1653 | * prevent the device from being mounted, repartitioned or |
| 1654 | * otherwise reused by a RAID array (or any other kernel |
| 1655 | * subsystem), by bd_claiming the device. |
| 1656 | */ |
| 1657 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
| 1658 | { |
| 1659 | int err = 0; |
| 1660 | struct block_device *bdev; |
| 1661 | char b[BDEVNAME_SIZE]; |
| 1662 | |
| 1663 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
| 1664 | if (IS_ERR(bdev)) { |
| 1665 | printk(KERN_ERR "md: could not open %s.\n", |
| 1666 | __bdevname(dev, b)); |
| 1667 | return PTR_ERR(bdev); |
| 1668 | } |
| 1669 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
| 1670 | if (err) { |
| 1671 | printk(KERN_ERR "md: could not bd_claim %s.\n", |
| 1672 | bdevname(bdev, b)); |
| 1673 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
| 1674 | return err; |
| 1675 | } |
| 1676 | if (!shared) |
| 1677 | set_bit(AllReserved, &rdev->flags); |
| 1678 | rdev->bdev = bdev; |
| 1679 | return err; |
| 1680 | } |
| 1681 | |
| 1682 | static void unlock_rdev(mdk_rdev_t *rdev) |
| 1683 | { |
| 1684 | struct block_device *bdev = rdev->bdev; |
| 1685 | rdev->bdev = NULL; |
| 1686 | if (!bdev) |
| 1687 | MD_BUG(); |
| 1688 | bd_release(bdev); |
| 1689 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
| 1690 | } |
| 1691 | |
| 1692 | void md_autodetect_dev(dev_t dev); |
| 1693 | |
| 1694 | static void export_rdev(mdk_rdev_t * rdev) |
| 1695 | { |
| 1696 | char b[BDEVNAME_SIZE]; |
| 1697 | printk(KERN_INFO "md: export_rdev(%s)\n", |
| 1698 | bdevname(rdev->bdev,b)); |
| 1699 | if (rdev->mddev) |
| 1700 | MD_BUG(); |
| 1701 | free_disk_sb(rdev); |
| 1702 | #ifndef MODULE |
| 1703 | if (test_bit(AutoDetected, &rdev->flags)) |
| 1704 | md_autodetect_dev(rdev->bdev->bd_dev); |
| 1705 | #endif |
| 1706 | unlock_rdev(rdev); |
| 1707 | kobject_put(&rdev->kobj); |
| 1708 | } |
| 1709 | |
| 1710 | static void kick_rdev_from_array(mdk_rdev_t * rdev) |
| 1711 | { |
| 1712 | unbind_rdev_from_array(rdev); |
| 1713 | export_rdev(rdev); |
| 1714 | } |
| 1715 | |
| 1716 | static void export_array(mddev_t *mddev) |
| 1717 | { |
| 1718 | mdk_rdev_t *rdev, *tmp; |
| 1719 | |
| 1720 | rdev_for_each(rdev, tmp, mddev) { |
| 1721 | if (!rdev->mddev) { |
| 1722 | MD_BUG(); |
| 1723 | continue; |
| 1724 | } |
| 1725 | kick_rdev_from_array(rdev); |
| 1726 | } |
| 1727 | if (!list_empty(&mddev->disks)) |
| 1728 | MD_BUG(); |
| 1729 | mddev->raid_disks = 0; |
| 1730 | mddev->major_version = 0; |
| 1731 | } |
| 1732 | |
| 1733 | static void print_desc(mdp_disk_t *desc) |
| 1734 | { |
| 1735 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, |
| 1736 | desc->major,desc->minor,desc->raid_disk,desc->state); |
| 1737 | } |
| 1738 | |
| 1739 | static void print_sb_90(mdp_super_t *sb) |
| 1740 | { |
| 1741 | int i; |
| 1742 | |
| 1743 | printk(KERN_INFO |
| 1744 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", |
| 1745 | sb->major_version, sb->minor_version, sb->patch_version, |
| 1746 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, |
| 1747 | sb->ctime); |
| 1748 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", |
| 1749 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, |
| 1750 | sb->md_minor, sb->layout, sb->chunk_size); |
| 1751 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" |
| 1752 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", |
| 1753 | sb->utime, sb->state, sb->active_disks, sb->working_disks, |
| 1754 | sb->failed_disks, sb->spare_disks, |
| 1755 | sb->sb_csum, (unsigned long)sb->events_lo); |
| 1756 | |
| 1757 | printk(KERN_INFO); |
| 1758 | for (i = 0; i < MD_SB_DISKS; i++) { |
| 1759 | mdp_disk_t *desc; |
| 1760 | |
| 1761 | desc = sb->disks + i; |
| 1762 | if (desc->number || desc->major || desc->minor || |
| 1763 | desc->raid_disk || (desc->state && (desc->state != 4))) { |
| 1764 | printk(" D %2d: ", i); |
| 1765 | print_desc(desc); |
| 1766 | } |
| 1767 | } |
| 1768 | printk(KERN_INFO "md: THIS: "); |
| 1769 | print_desc(&sb->this_disk); |
| 1770 | } |
| 1771 | |
| 1772 | static void print_sb_1(struct mdp_superblock_1 *sb) |
| 1773 | { |
| 1774 | __u8 *uuid; |
| 1775 | |
| 1776 | uuid = sb->set_uuid; |
| 1777 | printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" |
| 1778 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" |
| 1779 | KERN_INFO "md: Name: \"%s\" CT:%llu\n", |
| 1780 | le32_to_cpu(sb->major_version), |
| 1781 | le32_to_cpu(sb->feature_map), |
| 1782 | uuid[0], uuid[1], uuid[2], uuid[3], |
| 1783 | uuid[4], uuid[5], uuid[6], uuid[7], |
| 1784 | uuid[8], uuid[9], uuid[10], uuid[11], |
| 1785 | uuid[12], uuid[13], uuid[14], uuid[15], |
| 1786 | sb->set_name, |
| 1787 | (unsigned long long)le64_to_cpu(sb->ctime) |
| 1788 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); |
| 1789 | |
| 1790 | uuid = sb->device_uuid; |
| 1791 | printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" |
| 1792 | " RO:%llu\n" |
| 1793 | KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" |
| 1794 | ":%02x%02x%02x%02x%02x%02x\n" |
| 1795 | KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
| 1796 | KERN_INFO "md: (MaxDev:%u) \n", |
| 1797 | le32_to_cpu(sb->level), |
| 1798 | (unsigned long long)le64_to_cpu(sb->size), |
| 1799 | le32_to_cpu(sb->raid_disks), |
| 1800 | le32_to_cpu(sb->layout), |
| 1801 | le32_to_cpu(sb->chunksize), |
| 1802 | (unsigned long long)le64_to_cpu(sb->data_offset), |
| 1803 | (unsigned long long)le64_to_cpu(sb->data_size), |
| 1804 | (unsigned long long)le64_to_cpu(sb->super_offset), |
| 1805 | (unsigned long long)le64_to_cpu(sb->recovery_offset), |
| 1806 | le32_to_cpu(sb->dev_number), |
| 1807 | uuid[0], uuid[1], uuid[2], uuid[3], |
| 1808 | uuid[4], uuid[5], uuid[6], uuid[7], |
| 1809 | uuid[8], uuid[9], uuid[10], uuid[11], |
| 1810 | uuid[12], uuid[13], uuid[14], uuid[15], |
| 1811 | sb->devflags, |
| 1812 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, |
| 1813 | (unsigned long long)le64_to_cpu(sb->events), |
| 1814 | (unsigned long long)le64_to_cpu(sb->resync_offset), |
| 1815 | le32_to_cpu(sb->sb_csum), |
| 1816 | le32_to_cpu(sb->max_dev) |
| 1817 | ); |
| 1818 | } |
| 1819 | |
| 1820 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
| 1821 | { |
| 1822 | char b[BDEVNAME_SIZE]; |
| 1823 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
| 1824 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, |
| 1825 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
| 1826 | rdev->desc_nr); |
| 1827 | if (rdev->sb_loaded) { |
| 1828 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
| 1829 | switch (major_version) { |
| 1830 | case 0: |
| 1831 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); |
| 1832 | break; |
| 1833 | case 1: |
| 1834 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); |
| 1835 | break; |
| 1836 | } |
| 1837 | } else |
| 1838 | printk(KERN_INFO "md: no rdev superblock!\n"); |
| 1839 | } |
| 1840 | |
| 1841 | static void md_print_devices(void) |
| 1842 | { |
| 1843 | struct list_head *tmp; |
| 1844 | mdk_rdev_t *rdev; |
| 1845 | mddev_t *mddev; |
| 1846 | char b[BDEVNAME_SIZE]; |
| 1847 | |
| 1848 | printk("\n"); |
| 1849 | printk("md: **********************************\n"); |
| 1850 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); |
| 1851 | printk("md: **********************************\n"); |
| 1852 | for_each_mddev(mddev, tmp) { |
| 1853 | |
| 1854 | if (mddev->bitmap) |
| 1855 | bitmap_print_sb(mddev->bitmap); |
| 1856 | else |
| 1857 | printk("%s: ", mdname(mddev)); |
| 1858 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 1859 | printk("<%s>", bdevname(rdev->bdev,b)); |
| 1860 | printk("\n"); |
| 1861 | |
| 1862 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 1863 | print_rdev(rdev, mddev->major_version); |
| 1864 | } |
| 1865 | printk("md: **********************************\n"); |
| 1866 | printk("\n"); |
| 1867 | } |
| 1868 | |
| 1869 | |
| 1870 | static void sync_sbs(mddev_t * mddev, int nospares) |
| 1871 | { |
| 1872 | /* Update each superblock (in-memory image), but |
| 1873 | * if we are allowed to, skip spares which already |
| 1874 | * have the right event counter, or have one earlier |
| 1875 | * (which would mean they aren't being marked as dirty |
| 1876 | * with the rest of the array) |
| 1877 | */ |
| 1878 | mdk_rdev_t *rdev; |
| 1879 | |
| 1880 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 1881 | if (rdev->sb_events == mddev->events || |
| 1882 | (nospares && |
| 1883 | rdev->raid_disk < 0 && |
| 1884 | (rdev->sb_events&1)==0 && |
| 1885 | rdev->sb_events+1 == mddev->events)) { |
| 1886 | /* Don't update this superblock */ |
| 1887 | rdev->sb_loaded = 2; |
| 1888 | } else { |
| 1889 | super_types[mddev->major_version]. |
| 1890 | sync_super(mddev, rdev); |
| 1891 | rdev->sb_loaded = 1; |
| 1892 | } |
| 1893 | } |
| 1894 | } |
| 1895 | |
| 1896 | static void md_update_sb(mddev_t * mddev, int force_change) |
| 1897 | { |
| 1898 | mdk_rdev_t *rdev; |
| 1899 | int sync_req; |
| 1900 | int nospares = 0; |
| 1901 | |
| 1902 | if (mddev->external) |
| 1903 | return; |
| 1904 | repeat: |
| 1905 | spin_lock_irq(&mddev->write_lock); |
| 1906 | |
| 1907 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
| 1908 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
| 1909 | force_change = 1; |
| 1910 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
| 1911 | /* just a clean<-> dirty transition, possibly leave spares alone, |
| 1912 | * though if events isn't the right even/odd, we will have to do |
| 1913 | * spares after all |
| 1914 | */ |
| 1915 | nospares = 1; |
| 1916 | if (force_change) |
| 1917 | nospares = 0; |
| 1918 | if (mddev->degraded) |
| 1919 | /* If the array is degraded, then skipping spares is both |
| 1920 | * dangerous and fairly pointless. |
| 1921 | * Dangerous because a device that was removed from the array |
| 1922 | * might have a event_count that still looks up-to-date, |
| 1923 | * so it can be re-added without a resync. |
| 1924 | * Pointless because if there are any spares to skip, |
| 1925 | * then a recovery will happen and soon that array won't |
| 1926 | * be degraded any more and the spare can go back to sleep then. |
| 1927 | */ |
| 1928 | nospares = 0; |
| 1929 | |
| 1930 | sync_req = mddev->in_sync; |
| 1931 | mddev->utime = get_seconds(); |
| 1932 | |
| 1933 | /* If this is just a dirty<->clean transition, and the array is clean |
| 1934 | * and 'events' is odd, we can roll back to the previous clean state */ |
| 1935 | if (nospares |
| 1936 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
| 1937 | && (mddev->events & 1) |
| 1938 | && mddev->events != 1) |
| 1939 | mddev->events--; |
| 1940 | else { |
| 1941 | /* otherwise we have to go forward and ... */ |
| 1942 | mddev->events ++; |
| 1943 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ |
| 1944 | /* .. if the array isn't clean, insist on an odd 'events' */ |
| 1945 | if ((mddev->events&1)==0) { |
| 1946 | mddev->events++; |
| 1947 | nospares = 0; |
| 1948 | } |
| 1949 | } else { |
| 1950 | /* otherwise insist on an even 'events' (for clean states) */ |
| 1951 | if ((mddev->events&1)) { |
| 1952 | mddev->events++; |
| 1953 | nospares = 0; |
| 1954 | } |
| 1955 | } |
| 1956 | } |
| 1957 | |
| 1958 | if (!mddev->events) { |
| 1959 | /* |
| 1960 | * oops, this 64-bit counter should never wrap. |
| 1961 | * Either we are in around ~1 trillion A.C., assuming |
| 1962 | * 1 reboot per second, or we have a bug: |
| 1963 | */ |
| 1964 | MD_BUG(); |
| 1965 | mddev->events --; |
| 1966 | } |
| 1967 | |
| 1968 | /* |
| 1969 | * do not write anything to disk if using |
| 1970 | * nonpersistent superblocks |
| 1971 | */ |
| 1972 | if (!mddev->persistent) { |
| 1973 | if (!mddev->external) |
| 1974 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
| 1975 | |
| 1976 | spin_unlock_irq(&mddev->write_lock); |
| 1977 | wake_up(&mddev->sb_wait); |
| 1978 | return; |
| 1979 | } |
| 1980 | sync_sbs(mddev, nospares); |
| 1981 | spin_unlock_irq(&mddev->write_lock); |
| 1982 | |
| 1983 | dprintk(KERN_INFO |
| 1984 | "md: updating %s RAID superblock on device (in sync %d)\n", |
| 1985 | mdname(mddev),mddev->in_sync); |
| 1986 | |
| 1987 | bitmap_update_sb(mddev->bitmap); |
| 1988 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 1989 | char b[BDEVNAME_SIZE]; |
| 1990 | dprintk(KERN_INFO "md: "); |
| 1991 | if (rdev->sb_loaded != 1) |
| 1992 | continue; /* no noise on spare devices */ |
| 1993 | if (test_bit(Faulty, &rdev->flags)) |
| 1994 | dprintk("(skipping faulty "); |
| 1995 | |
| 1996 | dprintk("%s ", bdevname(rdev->bdev,b)); |
| 1997 | if (!test_bit(Faulty, &rdev->flags)) { |
| 1998 | md_super_write(mddev,rdev, |
| 1999 | rdev->sb_start, rdev->sb_size, |
| 2000 | rdev->sb_page); |
| 2001 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", |
| 2002 | bdevname(rdev->bdev,b), |
| 2003 | (unsigned long long)rdev->sb_start); |
| 2004 | rdev->sb_events = mddev->events; |
| 2005 | |
| 2006 | } else |
| 2007 | dprintk(")\n"); |
| 2008 | if (mddev->level == LEVEL_MULTIPATH) |
| 2009 | /* only need to write one superblock... */ |
| 2010 | break; |
| 2011 | } |
| 2012 | md_super_wait(mddev); |
| 2013 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
| 2014 | |
| 2015 | spin_lock_irq(&mddev->write_lock); |
| 2016 | if (mddev->in_sync != sync_req || |
| 2017 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { |
| 2018 | /* have to write it out again */ |
| 2019 | spin_unlock_irq(&mddev->write_lock); |
| 2020 | goto repeat; |
| 2021 | } |
| 2022 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
| 2023 | spin_unlock_irq(&mddev->write_lock); |
| 2024 | wake_up(&mddev->sb_wait); |
| 2025 | |
| 2026 | } |
| 2027 | |
| 2028 | /* words written to sysfs files may, or may not, be \n terminated. |
| 2029 | * We want to accept with case. For this we use cmd_match. |
| 2030 | */ |
| 2031 | static int cmd_match(const char *cmd, const char *str) |
| 2032 | { |
| 2033 | /* See if cmd, written into a sysfs file, matches |
| 2034 | * str. They must either be the same, or cmd can |
| 2035 | * have a trailing newline |
| 2036 | */ |
| 2037 | while (*cmd && *str && *cmd == *str) { |
| 2038 | cmd++; |
| 2039 | str++; |
| 2040 | } |
| 2041 | if (*cmd == '\n') |
| 2042 | cmd++; |
| 2043 | if (*str || *cmd) |
| 2044 | return 0; |
| 2045 | return 1; |
| 2046 | } |
| 2047 | |
| 2048 | struct rdev_sysfs_entry { |
| 2049 | struct attribute attr; |
| 2050 | ssize_t (*show)(mdk_rdev_t *, char *); |
| 2051 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); |
| 2052 | }; |
| 2053 | |
| 2054 | static ssize_t |
| 2055 | state_show(mdk_rdev_t *rdev, char *page) |
| 2056 | { |
| 2057 | char *sep = ""; |
| 2058 | size_t len = 0; |
| 2059 | |
| 2060 | if (test_bit(Faulty, &rdev->flags)) { |
| 2061 | len+= sprintf(page+len, "%sfaulty",sep); |
| 2062 | sep = ","; |
| 2063 | } |
| 2064 | if (test_bit(In_sync, &rdev->flags)) { |
| 2065 | len += sprintf(page+len, "%sin_sync",sep); |
| 2066 | sep = ","; |
| 2067 | } |
| 2068 | if (test_bit(WriteMostly, &rdev->flags)) { |
| 2069 | len += sprintf(page+len, "%swrite_mostly",sep); |
| 2070 | sep = ","; |
| 2071 | } |
| 2072 | if (test_bit(Blocked, &rdev->flags)) { |
| 2073 | len += sprintf(page+len, "%sblocked", sep); |
| 2074 | sep = ","; |
| 2075 | } |
| 2076 | if (!test_bit(Faulty, &rdev->flags) && |
| 2077 | !test_bit(In_sync, &rdev->flags)) { |
| 2078 | len += sprintf(page+len, "%sspare", sep); |
| 2079 | sep = ","; |
| 2080 | } |
| 2081 | return len+sprintf(page+len, "\n"); |
| 2082 | } |
| 2083 | |
| 2084 | static ssize_t |
| 2085 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) |
| 2086 | { |
| 2087 | /* can write |
| 2088 | * faulty - simulates and error |
| 2089 | * remove - disconnects the device |
| 2090 | * writemostly - sets write_mostly |
| 2091 | * -writemostly - clears write_mostly |
| 2092 | * blocked - sets the Blocked flag |
| 2093 | * -blocked - clears the Blocked flag |
| 2094 | */ |
| 2095 | int err = -EINVAL; |
| 2096 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { |
| 2097 | md_error(rdev->mddev, rdev); |
| 2098 | err = 0; |
| 2099 | } else if (cmd_match(buf, "remove")) { |
| 2100 | if (rdev->raid_disk >= 0) |
| 2101 | err = -EBUSY; |
| 2102 | else { |
| 2103 | mddev_t *mddev = rdev->mddev; |
| 2104 | kick_rdev_from_array(rdev); |
| 2105 | if (mddev->pers) |
| 2106 | md_update_sb(mddev, 1); |
| 2107 | md_new_event(mddev); |
| 2108 | err = 0; |
| 2109 | } |
| 2110 | } else if (cmd_match(buf, "writemostly")) { |
| 2111 | set_bit(WriteMostly, &rdev->flags); |
| 2112 | err = 0; |
| 2113 | } else if (cmd_match(buf, "-writemostly")) { |
| 2114 | clear_bit(WriteMostly, &rdev->flags); |
| 2115 | err = 0; |
| 2116 | } else if (cmd_match(buf, "blocked")) { |
| 2117 | set_bit(Blocked, &rdev->flags); |
| 2118 | err = 0; |
| 2119 | } else if (cmd_match(buf, "-blocked")) { |
| 2120 | clear_bit(Blocked, &rdev->flags); |
| 2121 | wake_up(&rdev->blocked_wait); |
| 2122 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
| 2123 | md_wakeup_thread(rdev->mddev->thread); |
| 2124 | |
| 2125 | err = 0; |
| 2126 | } |
| 2127 | if (!err && rdev->sysfs_state) |
| 2128 | sysfs_notify_dirent(rdev->sysfs_state); |
| 2129 | return err ? err : len; |
| 2130 | } |
| 2131 | static struct rdev_sysfs_entry rdev_state = |
| 2132 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); |
| 2133 | |
| 2134 | static ssize_t |
| 2135 | errors_show(mdk_rdev_t *rdev, char *page) |
| 2136 | { |
| 2137 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); |
| 2138 | } |
| 2139 | |
| 2140 | static ssize_t |
| 2141 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) |
| 2142 | { |
| 2143 | char *e; |
| 2144 | unsigned long n = simple_strtoul(buf, &e, 10); |
| 2145 | if (*buf && (*e == 0 || *e == '\n')) { |
| 2146 | atomic_set(&rdev->corrected_errors, n); |
| 2147 | return len; |
| 2148 | } |
| 2149 | return -EINVAL; |
| 2150 | } |
| 2151 | static struct rdev_sysfs_entry rdev_errors = |
| 2152 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
| 2153 | |
| 2154 | static ssize_t |
| 2155 | slot_show(mdk_rdev_t *rdev, char *page) |
| 2156 | { |
| 2157 | if (rdev->raid_disk < 0) |
| 2158 | return sprintf(page, "none\n"); |
| 2159 | else |
| 2160 | return sprintf(page, "%d\n", rdev->raid_disk); |
| 2161 | } |
| 2162 | |
| 2163 | static ssize_t |
| 2164 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) |
| 2165 | { |
| 2166 | char *e; |
| 2167 | int err; |
| 2168 | char nm[20]; |
| 2169 | int slot = simple_strtoul(buf, &e, 10); |
| 2170 | if (strncmp(buf, "none", 4)==0) |
| 2171 | slot = -1; |
| 2172 | else if (e==buf || (*e && *e!= '\n')) |
| 2173 | return -EINVAL; |
| 2174 | if (rdev->mddev->pers && slot == -1) { |
| 2175 | /* Setting 'slot' on an active array requires also |
| 2176 | * updating the 'rd%d' link, and communicating |
| 2177 | * with the personality with ->hot_*_disk. |
| 2178 | * For now we only support removing |
| 2179 | * failed/spare devices. This normally happens automatically, |
| 2180 | * but not when the metadata is externally managed. |
| 2181 | */ |
| 2182 | if (rdev->raid_disk == -1) |
| 2183 | return -EEXIST; |
| 2184 | /* personality does all needed checks */ |
| 2185 | if (rdev->mddev->pers->hot_add_disk == NULL) |
| 2186 | return -EINVAL; |
| 2187 | err = rdev->mddev->pers-> |
| 2188 | hot_remove_disk(rdev->mddev, rdev->raid_disk); |
| 2189 | if (err) |
| 2190 | return err; |
| 2191 | sprintf(nm, "rd%d", rdev->raid_disk); |
| 2192 | sysfs_remove_link(&rdev->mddev->kobj, nm); |
| 2193 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
| 2194 | md_wakeup_thread(rdev->mddev->thread); |
| 2195 | } else if (rdev->mddev->pers) { |
| 2196 | mdk_rdev_t *rdev2; |
| 2197 | /* Activating a spare .. or possibly reactivating |
| 2198 | * if we every get bitmaps working here. |
| 2199 | */ |
| 2200 | |
| 2201 | if (rdev->raid_disk != -1) |
| 2202 | return -EBUSY; |
| 2203 | |
| 2204 | if (rdev->mddev->pers->hot_add_disk == NULL) |
| 2205 | return -EINVAL; |
| 2206 | |
| 2207 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
| 2208 | if (rdev2->raid_disk == slot) |
| 2209 | return -EEXIST; |
| 2210 | |
| 2211 | rdev->raid_disk = slot; |
| 2212 | if (test_bit(In_sync, &rdev->flags)) |
| 2213 | rdev->saved_raid_disk = slot; |
| 2214 | else |
| 2215 | rdev->saved_raid_disk = -1; |
| 2216 | err = rdev->mddev->pers-> |
| 2217 | hot_add_disk(rdev->mddev, rdev); |
| 2218 | if (err) { |
| 2219 | rdev->raid_disk = -1; |
| 2220 | return err; |
| 2221 | } else |
| 2222 | sysfs_notify_dirent(rdev->sysfs_state); |
| 2223 | sprintf(nm, "rd%d", rdev->raid_disk); |
| 2224 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) |
| 2225 | printk(KERN_WARNING |
| 2226 | "md: cannot register " |
| 2227 | "%s for %s\n", |
| 2228 | nm, mdname(rdev->mddev)); |
| 2229 | |
| 2230 | /* don't wakeup anyone, leave that to userspace. */ |
| 2231 | } else { |
| 2232 | if (slot >= rdev->mddev->raid_disks) |
| 2233 | return -ENOSPC; |
| 2234 | rdev->raid_disk = slot; |
| 2235 | /* assume it is working */ |
| 2236 | clear_bit(Faulty, &rdev->flags); |
| 2237 | clear_bit(WriteMostly, &rdev->flags); |
| 2238 | set_bit(In_sync, &rdev->flags); |
| 2239 | sysfs_notify_dirent(rdev->sysfs_state); |
| 2240 | } |
| 2241 | return len; |
| 2242 | } |
| 2243 | |
| 2244 | |
| 2245 | static struct rdev_sysfs_entry rdev_slot = |
| 2246 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
| 2247 | |
| 2248 | static ssize_t |
| 2249 | offset_show(mdk_rdev_t *rdev, char *page) |
| 2250 | { |
| 2251 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
| 2252 | } |
| 2253 | |
| 2254 | static ssize_t |
| 2255 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) |
| 2256 | { |
| 2257 | char *e; |
| 2258 | unsigned long long offset = simple_strtoull(buf, &e, 10); |
| 2259 | if (e==buf || (*e && *e != '\n')) |
| 2260 | return -EINVAL; |
| 2261 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
| 2262 | return -EBUSY; |
| 2263 | if (rdev->sectors && rdev->mddev->external) |
| 2264 | /* Must set offset before size, so overlap checks |
| 2265 | * can be sane */ |
| 2266 | return -EBUSY; |
| 2267 | rdev->data_offset = offset; |
| 2268 | return len; |
| 2269 | } |
| 2270 | |
| 2271 | static struct rdev_sysfs_entry rdev_offset = |
| 2272 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
| 2273 | |
| 2274 | static ssize_t |
| 2275 | rdev_size_show(mdk_rdev_t *rdev, char *page) |
| 2276 | { |
| 2277 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
| 2278 | } |
| 2279 | |
| 2280 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
| 2281 | { |
| 2282 | /* check if two start/length pairs overlap */ |
| 2283 | if (s1+l1 <= s2) |
| 2284 | return 0; |
| 2285 | if (s2+l2 <= s1) |
| 2286 | return 0; |
| 2287 | return 1; |
| 2288 | } |
| 2289 | |
| 2290 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
| 2291 | { |
| 2292 | unsigned long long blocks; |
| 2293 | sector_t new; |
| 2294 | |
| 2295 | if (strict_strtoull(buf, 10, &blocks) < 0) |
| 2296 | return -EINVAL; |
| 2297 | |
| 2298 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) |
| 2299 | return -EINVAL; /* sector conversion overflow */ |
| 2300 | |
| 2301 | new = blocks * 2; |
| 2302 | if (new != blocks * 2) |
| 2303 | return -EINVAL; /* unsigned long long to sector_t overflow */ |
| 2304 | |
| 2305 | *sectors = new; |
| 2306 | return 0; |
| 2307 | } |
| 2308 | |
| 2309 | static ssize_t |
| 2310 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) |
| 2311 | { |
| 2312 | mddev_t *my_mddev = rdev->mddev; |
| 2313 | sector_t oldsectors = rdev->sectors; |
| 2314 | sector_t sectors; |
| 2315 | |
| 2316 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
| 2317 | return -EINVAL; |
| 2318 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
| 2319 | if (my_mddev->persistent) { |
| 2320 | sectors = super_types[my_mddev->major_version]. |
| 2321 | rdev_size_change(rdev, sectors); |
| 2322 | if (!sectors) |
| 2323 | return -EBUSY; |
| 2324 | } else if (!sectors) |
| 2325 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
| 2326 | rdev->data_offset; |
| 2327 | } |
| 2328 | if (sectors < my_mddev->dev_sectors) |
| 2329 | return -EINVAL; /* component must fit device */ |
| 2330 | |
| 2331 | rdev->sectors = sectors; |
| 2332 | if (sectors > oldsectors && my_mddev->external) { |
| 2333 | /* need to check that all other rdevs with the same ->bdev |
| 2334 | * do not overlap. We need to unlock the mddev to avoid |
| 2335 | * a deadlock. We have already changed rdev->sectors, and if |
| 2336 | * we have to change it back, we will have the lock again. |
| 2337 | */ |
| 2338 | mddev_t *mddev; |
| 2339 | int overlap = 0; |
| 2340 | struct list_head *tmp; |
| 2341 | |
| 2342 | mddev_unlock(my_mddev); |
| 2343 | for_each_mddev(mddev, tmp) { |
| 2344 | mdk_rdev_t *rdev2; |
| 2345 | |
| 2346 | mddev_lock(mddev); |
| 2347 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
| 2348 | if (test_bit(AllReserved, &rdev2->flags) || |
| 2349 | (rdev->bdev == rdev2->bdev && |
| 2350 | rdev != rdev2 && |
| 2351 | overlaps(rdev->data_offset, rdev->sectors, |
| 2352 | rdev2->data_offset, |
| 2353 | rdev2->sectors))) { |
| 2354 | overlap = 1; |
| 2355 | break; |
| 2356 | } |
| 2357 | mddev_unlock(mddev); |
| 2358 | if (overlap) { |
| 2359 | mddev_put(mddev); |
| 2360 | break; |
| 2361 | } |
| 2362 | } |
| 2363 | mddev_lock(my_mddev); |
| 2364 | if (overlap) { |
| 2365 | /* Someone else could have slipped in a size |
| 2366 | * change here, but doing so is just silly. |
| 2367 | * We put oldsectors back because we *know* it is |
| 2368 | * safe, and trust userspace not to race with |
| 2369 | * itself |
| 2370 | */ |
| 2371 | rdev->sectors = oldsectors; |
| 2372 | return -EBUSY; |
| 2373 | } |
| 2374 | } |
| 2375 | return len; |
| 2376 | } |
| 2377 | |
| 2378 | static struct rdev_sysfs_entry rdev_size = |
| 2379 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
| 2380 | |
| 2381 | static struct attribute *rdev_default_attrs[] = { |
| 2382 | &rdev_state.attr, |
| 2383 | &rdev_errors.attr, |
| 2384 | &rdev_slot.attr, |
| 2385 | &rdev_offset.attr, |
| 2386 | &rdev_size.attr, |
| 2387 | NULL, |
| 2388 | }; |
| 2389 | static ssize_t |
| 2390 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) |
| 2391 | { |
| 2392 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); |
| 2393 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); |
| 2394 | mddev_t *mddev = rdev->mddev; |
| 2395 | ssize_t rv; |
| 2396 | |
| 2397 | if (!entry->show) |
| 2398 | return -EIO; |
| 2399 | |
| 2400 | rv = mddev ? mddev_lock(mddev) : -EBUSY; |
| 2401 | if (!rv) { |
| 2402 | if (rdev->mddev == NULL) |
| 2403 | rv = -EBUSY; |
| 2404 | else |
| 2405 | rv = entry->show(rdev, page); |
| 2406 | mddev_unlock(mddev); |
| 2407 | } |
| 2408 | return rv; |
| 2409 | } |
| 2410 | |
| 2411 | static ssize_t |
| 2412 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, |
| 2413 | const char *page, size_t length) |
| 2414 | { |
| 2415 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); |
| 2416 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); |
| 2417 | ssize_t rv; |
| 2418 | mddev_t *mddev = rdev->mddev; |
| 2419 | |
| 2420 | if (!entry->store) |
| 2421 | return -EIO; |
| 2422 | if (!capable(CAP_SYS_ADMIN)) |
| 2423 | return -EACCES; |
| 2424 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
| 2425 | if (!rv) { |
| 2426 | if (rdev->mddev == NULL) |
| 2427 | rv = -EBUSY; |
| 2428 | else |
| 2429 | rv = entry->store(rdev, page, length); |
| 2430 | mddev_unlock(mddev); |
| 2431 | } |
| 2432 | return rv; |
| 2433 | } |
| 2434 | |
| 2435 | static void rdev_free(struct kobject *ko) |
| 2436 | { |
| 2437 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); |
| 2438 | kfree(rdev); |
| 2439 | } |
| 2440 | static struct sysfs_ops rdev_sysfs_ops = { |
| 2441 | .show = rdev_attr_show, |
| 2442 | .store = rdev_attr_store, |
| 2443 | }; |
| 2444 | static struct kobj_type rdev_ktype = { |
| 2445 | .release = rdev_free, |
| 2446 | .sysfs_ops = &rdev_sysfs_ops, |
| 2447 | .default_attrs = rdev_default_attrs, |
| 2448 | }; |
| 2449 | |
| 2450 | /* |
| 2451 | * Import a device. If 'super_format' >= 0, then sanity check the superblock |
| 2452 | * |
| 2453 | * mark the device faulty if: |
| 2454 | * |
| 2455 | * - the device is nonexistent (zero size) |
| 2456 | * - the device has no valid superblock |
| 2457 | * |
| 2458 | * a faulty rdev _never_ has rdev->sb set. |
| 2459 | */ |
| 2460 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) |
| 2461 | { |
| 2462 | char b[BDEVNAME_SIZE]; |
| 2463 | int err; |
| 2464 | mdk_rdev_t *rdev; |
| 2465 | sector_t size; |
| 2466 | |
| 2467 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
| 2468 | if (!rdev) { |
| 2469 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); |
| 2470 | return ERR_PTR(-ENOMEM); |
| 2471 | } |
| 2472 | |
| 2473 | if ((err = alloc_disk_sb(rdev))) |
| 2474 | goto abort_free; |
| 2475 | |
| 2476 | err = lock_rdev(rdev, newdev, super_format == -2); |
| 2477 | if (err) |
| 2478 | goto abort_free; |
| 2479 | |
| 2480 | kobject_init(&rdev->kobj, &rdev_ktype); |
| 2481 | |
| 2482 | rdev->desc_nr = -1; |
| 2483 | rdev->saved_raid_disk = -1; |
| 2484 | rdev->raid_disk = -1; |
| 2485 | rdev->flags = 0; |
| 2486 | rdev->data_offset = 0; |
| 2487 | rdev->sb_events = 0; |
| 2488 | atomic_set(&rdev->nr_pending, 0); |
| 2489 | atomic_set(&rdev->read_errors, 0); |
| 2490 | atomic_set(&rdev->corrected_errors, 0); |
| 2491 | |
| 2492 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; |
| 2493 | if (!size) { |
| 2494 | printk(KERN_WARNING |
| 2495 | "md: %s has zero or unknown size, marking faulty!\n", |
| 2496 | bdevname(rdev->bdev,b)); |
| 2497 | err = -EINVAL; |
| 2498 | goto abort_free; |
| 2499 | } |
| 2500 | |
| 2501 | if (super_format >= 0) { |
| 2502 | err = super_types[super_format]. |
| 2503 | load_super(rdev, NULL, super_minor); |
| 2504 | if (err == -EINVAL) { |
| 2505 | printk(KERN_WARNING |
| 2506 | "md: %s does not have a valid v%d.%d " |
| 2507 | "superblock, not importing!\n", |
| 2508 | bdevname(rdev->bdev,b), |
| 2509 | super_format, super_minor); |
| 2510 | goto abort_free; |
| 2511 | } |
| 2512 | if (err < 0) { |
| 2513 | printk(KERN_WARNING |
| 2514 | "md: could not read %s's sb, not importing!\n", |
| 2515 | bdevname(rdev->bdev,b)); |
| 2516 | goto abort_free; |
| 2517 | } |
| 2518 | } |
| 2519 | |
| 2520 | INIT_LIST_HEAD(&rdev->same_set); |
| 2521 | init_waitqueue_head(&rdev->blocked_wait); |
| 2522 | |
| 2523 | return rdev; |
| 2524 | |
| 2525 | abort_free: |
| 2526 | if (rdev->sb_page) { |
| 2527 | if (rdev->bdev) |
| 2528 | unlock_rdev(rdev); |
| 2529 | free_disk_sb(rdev); |
| 2530 | } |
| 2531 | kfree(rdev); |
| 2532 | return ERR_PTR(err); |
| 2533 | } |
| 2534 | |
| 2535 | /* |
| 2536 | * Check a full RAID array for plausibility |
| 2537 | */ |
| 2538 | |
| 2539 | |
| 2540 | static void analyze_sbs(mddev_t * mddev) |
| 2541 | { |
| 2542 | int i; |
| 2543 | mdk_rdev_t *rdev, *freshest, *tmp; |
| 2544 | char b[BDEVNAME_SIZE]; |
| 2545 | |
| 2546 | freshest = NULL; |
| 2547 | rdev_for_each(rdev, tmp, mddev) |
| 2548 | switch (super_types[mddev->major_version]. |
| 2549 | load_super(rdev, freshest, mddev->minor_version)) { |
| 2550 | case 1: |
| 2551 | freshest = rdev; |
| 2552 | break; |
| 2553 | case 0: |
| 2554 | break; |
| 2555 | default: |
| 2556 | printk( KERN_ERR \ |
| 2557 | "md: fatal superblock inconsistency in %s" |
| 2558 | " -- removing from array\n", |
| 2559 | bdevname(rdev->bdev,b)); |
| 2560 | kick_rdev_from_array(rdev); |
| 2561 | } |
| 2562 | |
| 2563 | |
| 2564 | super_types[mddev->major_version]. |
| 2565 | validate_super(mddev, freshest); |
| 2566 | |
| 2567 | i = 0; |
| 2568 | rdev_for_each(rdev, tmp, mddev) { |
| 2569 | if (rdev->desc_nr >= mddev->max_disks || |
| 2570 | i > mddev->max_disks) { |
| 2571 | printk(KERN_WARNING |
| 2572 | "md: %s: %s: only %d devices permitted\n", |
| 2573 | mdname(mddev), bdevname(rdev->bdev, b), |
| 2574 | mddev->max_disks); |
| 2575 | kick_rdev_from_array(rdev); |
| 2576 | continue; |
| 2577 | } |
| 2578 | if (rdev != freshest) |
| 2579 | if (super_types[mddev->major_version]. |
| 2580 | validate_super(mddev, rdev)) { |
| 2581 | printk(KERN_WARNING "md: kicking non-fresh %s" |
| 2582 | " from array!\n", |
| 2583 | bdevname(rdev->bdev,b)); |
| 2584 | kick_rdev_from_array(rdev); |
| 2585 | continue; |
| 2586 | } |
| 2587 | if (mddev->level == LEVEL_MULTIPATH) { |
| 2588 | rdev->desc_nr = i++; |
| 2589 | rdev->raid_disk = rdev->desc_nr; |
| 2590 | set_bit(In_sync, &rdev->flags); |
| 2591 | } else if (rdev->raid_disk >= mddev->raid_disks) { |
| 2592 | rdev->raid_disk = -1; |
| 2593 | clear_bit(In_sync, &rdev->flags); |
| 2594 | } |
| 2595 | } |
| 2596 | |
| 2597 | |
| 2598 | |
| 2599 | if (mddev->recovery_cp != MaxSector && |
| 2600 | mddev->level >= 1) |
| 2601 | printk(KERN_ERR "md: %s: raid array is not clean" |
| 2602 | " -- starting background reconstruction\n", |
| 2603 | mdname(mddev)); |
| 2604 | |
| 2605 | } |
| 2606 | |
| 2607 | static void md_safemode_timeout(unsigned long data); |
| 2608 | |
| 2609 | static ssize_t |
| 2610 | safe_delay_show(mddev_t *mddev, char *page) |
| 2611 | { |
| 2612 | int msec = (mddev->safemode_delay*1000)/HZ; |
| 2613 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); |
| 2614 | } |
| 2615 | static ssize_t |
| 2616 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) |
| 2617 | { |
| 2618 | int scale=1; |
| 2619 | int dot=0; |
| 2620 | int i; |
| 2621 | unsigned long msec; |
| 2622 | char buf[30]; |
| 2623 | |
| 2624 | /* remove a period, and count digits after it */ |
| 2625 | if (len >= sizeof(buf)) |
| 2626 | return -EINVAL; |
| 2627 | strlcpy(buf, cbuf, sizeof(buf)); |
| 2628 | for (i=0; i<len; i++) { |
| 2629 | if (dot) { |
| 2630 | if (isdigit(buf[i])) { |
| 2631 | buf[i-1] = buf[i]; |
| 2632 | scale *= 10; |
| 2633 | } |
| 2634 | buf[i] = 0; |
| 2635 | } else if (buf[i] == '.') { |
| 2636 | dot=1; |
| 2637 | buf[i] = 0; |
| 2638 | } |
| 2639 | } |
| 2640 | if (strict_strtoul(buf, 10, &msec) < 0) |
| 2641 | return -EINVAL; |
| 2642 | msec = (msec * 1000) / scale; |
| 2643 | if (msec == 0) |
| 2644 | mddev->safemode_delay = 0; |
| 2645 | else { |
| 2646 | unsigned long old_delay = mddev->safemode_delay; |
| 2647 | mddev->safemode_delay = (msec*HZ)/1000; |
| 2648 | if (mddev->safemode_delay == 0) |
| 2649 | mddev->safemode_delay = 1; |
| 2650 | if (mddev->safemode_delay < old_delay) |
| 2651 | md_safemode_timeout((unsigned long)mddev); |
| 2652 | } |
| 2653 | return len; |
| 2654 | } |
| 2655 | static struct md_sysfs_entry md_safe_delay = |
| 2656 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
| 2657 | |
| 2658 | static ssize_t |
| 2659 | level_show(mddev_t *mddev, char *page) |
| 2660 | { |
| 2661 | struct mdk_personality *p = mddev->pers; |
| 2662 | if (p) |
| 2663 | return sprintf(page, "%s\n", p->name); |
| 2664 | else if (mddev->clevel[0]) |
| 2665 | return sprintf(page, "%s\n", mddev->clevel); |
| 2666 | else if (mddev->level != LEVEL_NONE) |
| 2667 | return sprintf(page, "%d\n", mddev->level); |
| 2668 | else |
| 2669 | return 0; |
| 2670 | } |
| 2671 | |
| 2672 | static ssize_t |
| 2673 | level_store(mddev_t *mddev, const char *buf, size_t len) |
| 2674 | { |
| 2675 | char level[16]; |
| 2676 | ssize_t rv = len; |
| 2677 | struct mdk_personality *pers; |
| 2678 | void *priv; |
| 2679 | |
| 2680 | if (mddev->pers == NULL) { |
| 2681 | if (len == 0) |
| 2682 | return 0; |
| 2683 | if (len >= sizeof(mddev->clevel)) |
| 2684 | return -ENOSPC; |
| 2685 | strncpy(mddev->clevel, buf, len); |
| 2686 | if (mddev->clevel[len-1] == '\n') |
| 2687 | len--; |
| 2688 | mddev->clevel[len] = 0; |
| 2689 | mddev->level = LEVEL_NONE; |
| 2690 | return rv; |
| 2691 | } |
| 2692 | |
| 2693 | /* request to change the personality. Need to ensure: |
| 2694 | * - array is not engaged in resync/recovery/reshape |
| 2695 | * - old personality can be suspended |
| 2696 | * - new personality will access other array. |
| 2697 | */ |
| 2698 | |
| 2699 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
| 2700 | return -EBUSY; |
| 2701 | |
| 2702 | if (!mddev->pers->quiesce) { |
| 2703 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", |
| 2704 | mdname(mddev), mddev->pers->name); |
| 2705 | return -EINVAL; |
| 2706 | } |
| 2707 | |
| 2708 | /* Now find the new personality */ |
| 2709 | if (len == 0 || len >= sizeof(level)) |
| 2710 | return -EINVAL; |
| 2711 | strncpy(level, buf, len); |
| 2712 | if (level[len-1] == '\n') |
| 2713 | len--; |
| 2714 | level[len] = 0; |
| 2715 | |
| 2716 | request_module("md-%s", level); |
| 2717 | spin_lock(&pers_lock); |
| 2718 | pers = find_pers(LEVEL_NONE, level); |
| 2719 | if (!pers || !try_module_get(pers->owner)) { |
| 2720 | spin_unlock(&pers_lock); |
| 2721 | printk(KERN_WARNING "md: personality %s not loaded\n", level); |
| 2722 | return -EINVAL; |
| 2723 | } |
| 2724 | spin_unlock(&pers_lock); |
| 2725 | |
| 2726 | if (pers == mddev->pers) { |
| 2727 | /* Nothing to do! */ |
| 2728 | module_put(pers->owner); |
| 2729 | return rv; |
| 2730 | } |
| 2731 | if (!pers->takeover) { |
| 2732 | module_put(pers->owner); |
| 2733 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", |
| 2734 | mdname(mddev), level); |
| 2735 | return -EINVAL; |
| 2736 | } |
| 2737 | |
| 2738 | /* ->takeover must set new_* and/or delta_disks |
| 2739 | * if it succeeds, and may set them when it fails. |
| 2740 | */ |
| 2741 | priv = pers->takeover(mddev); |
| 2742 | if (IS_ERR(priv)) { |
| 2743 | mddev->new_level = mddev->level; |
| 2744 | mddev->new_layout = mddev->layout; |
| 2745 | mddev->new_chunk = mddev->chunk_size; |
| 2746 | mddev->raid_disks -= mddev->delta_disks; |
| 2747 | mddev->delta_disks = 0; |
| 2748 | module_put(pers->owner); |
| 2749 | printk(KERN_WARNING "md: %s: %s would not accept array\n", |
| 2750 | mdname(mddev), level); |
| 2751 | return PTR_ERR(priv); |
| 2752 | } |
| 2753 | |
| 2754 | /* Looks like we have a winner */ |
| 2755 | mddev_suspend(mddev); |
| 2756 | mddev->pers->stop(mddev); |
| 2757 | module_put(mddev->pers->owner); |
| 2758 | mddev->pers = pers; |
| 2759 | mddev->private = priv; |
| 2760 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
| 2761 | mddev->level = mddev->new_level; |
| 2762 | mddev->layout = mddev->new_layout; |
| 2763 | mddev->chunk_size = mddev->new_chunk; |
| 2764 | mddev->delta_disks = 0; |
| 2765 | pers->run(mddev); |
| 2766 | mddev_resume(mddev); |
| 2767 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| 2768 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 2769 | md_wakeup_thread(mddev->thread); |
| 2770 | return rv; |
| 2771 | } |
| 2772 | |
| 2773 | static struct md_sysfs_entry md_level = |
| 2774 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
| 2775 | |
| 2776 | |
| 2777 | static ssize_t |
| 2778 | layout_show(mddev_t *mddev, char *page) |
| 2779 | { |
| 2780 | /* just a number, not meaningful for all levels */ |
| 2781 | if (mddev->reshape_position != MaxSector && |
| 2782 | mddev->layout != mddev->new_layout) |
| 2783 | return sprintf(page, "%d (%d)\n", |
| 2784 | mddev->new_layout, mddev->layout); |
| 2785 | return sprintf(page, "%d\n", mddev->layout); |
| 2786 | } |
| 2787 | |
| 2788 | static ssize_t |
| 2789 | layout_store(mddev_t *mddev, const char *buf, size_t len) |
| 2790 | { |
| 2791 | char *e; |
| 2792 | unsigned long n = simple_strtoul(buf, &e, 10); |
| 2793 | |
| 2794 | if (!*buf || (*e && *e != '\n')) |
| 2795 | return -EINVAL; |
| 2796 | |
| 2797 | if (mddev->pers) { |
| 2798 | int err; |
| 2799 | if (mddev->pers->reconfig == NULL) |
| 2800 | return -EBUSY; |
| 2801 | err = mddev->pers->reconfig(mddev, n, -1); |
| 2802 | if (err) |
| 2803 | return err; |
| 2804 | } else { |
| 2805 | mddev->new_layout = n; |
| 2806 | if (mddev->reshape_position == MaxSector) |
| 2807 | mddev->layout = n; |
| 2808 | } |
| 2809 | return len; |
| 2810 | } |
| 2811 | static struct md_sysfs_entry md_layout = |
| 2812 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
| 2813 | |
| 2814 | |
| 2815 | static ssize_t |
| 2816 | raid_disks_show(mddev_t *mddev, char *page) |
| 2817 | { |
| 2818 | if (mddev->raid_disks == 0) |
| 2819 | return 0; |
| 2820 | if (mddev->reshape_position != MaxSector && |
| 2821 | mddev->delta_disks != 0) |
| 2822 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, |
| 2823 | mddev->raid_disks - mddev->delta_disks); |
| 2824 | return sprintf(page, "%d\n", mddev->raid_disks); |
| 2825 | } |
| 2826 | |
| 2827 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
| 2828 | |
| 2829 | static ssize_t |
| 2830 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) |
| 2831 | { |
| 2832 | char *e; |
| 2833 | int rv = 0; |
| 2834 | unsigned long n = simple_strtoul(buf, &e, 10); |
| 2835 | |
| 2836 | if (!*buf || (*e && *e != '\n')) |
| 2837 | return -EINVAL; |
| 2838 | |
| 2839 | if (mddev->pers) |
| 2840 | rv = update_raid_disks(mddev, n); |
| 2841 | else if (mddev->reshape_position != MaxSector) { |
| 2842 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
| 2843 | mddev->delta_disks = n - olddisks; |
| 2844 | mddev->raid_disks = n; |
| 2845 | } else |
| 2846 | mddev->raid_disks = n; |
| 2847 | return rv ? rv : len; |
| 2848 | } |
| 2849 | static struct md_sysfs_entry md_raid_disks = |
| 2850 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
| 2851 | |
| 2852 | static ssize_t |
| 2853 | chunk_size_show(mddev_t *mddev, char *page) |
| 2854 | { |
| 2855 | if (mddev->reshape_position != MaxSector && |
| 2856 | mddev->chunk_size != mddev->new_chunk) |
| 2857 | return sprintf(page, "%d (%d)\n", mddev->new_chunk, |
| 2858 | mddev->chunk_size); |
| 2859 | return sprintf(page, "%d\n", mddev->chunk_size); |
| 2860 | } |
| 2861 | |
| 2862 | static ssize_t |
| 2863 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) |
| 2864 | { |
| 2865 | char *e; |
| 2866 | unsigned long n = simple_strtoul(buf, &e, 10); |
| 2867 | |
| 2868 | if (!*buf || (*e && *e != '\n')) |
| 2869 | return -EINVAL; |
| 2870 | |
| 2871 | if (mddev->pers) { |
| 2872 | int err; |
| 2873 | if (mddev->pers->reconfig == NULL) |
| 2874 | return -EBUSY; |
| 2875 | err = mddev->pers->reconfig(mddev, -1, n); |
| 2876 | if (err) |
| 2877 | return err; |
| 2878 | } else { |
| 2879 | mddev->new_chunk = n; |
| 2880 | if (mddev->reshape_position == MaxSector) |
| 2881 | mddev->chunk_size = n; |
| 2882 | } |
| 2883 | return len; |
| 2884 | } |
| 2885 | static struct md_sysfs_entry md_chunk_size = |
| 2886 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
| 2887 | |
| 2888 | static ssize_t |
| 2889 | resync_start_show(mddev_t *mddev, char *page) |
| 2890 | { |
| 2891 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
| 2892 | } |
| 2893 | |
| 2894 | static ssize_t |
| 2895 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) |
| 2896 | { |
| 2897 | char *e; |
| 2898 | unsigned long long n = simple_strtoull(buf, &e, 10); |
| 2899 | |
| 2900 | if (mddev->pers) |
| 2901 | return -EBUSY; |
| 2902 | if (!*buf || (*e && *e != '\n')) |
| 2903 | return -EINVAL; |
| 2904 | |
| 2905 | mddev->recovery_cp = n; |
| 2906 | return len; |
| 2907 | } |
| 2908 | static struct md_sysfs_entry md_resync_start = |
| 2909 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
| 2910 | |
| 2911 | /* |
| 2912 | * The array state can be: |
| 2913 | * |
| 2914 | * clear |
| 2915 | * No devices, no size, no level |
| 2916 | * Equivalent to STOP_ARRAY ioctl |
| 2917 | * inactive |
| 2918 | * May have some settings, but array is not active |
| 2919 | * all IO results in error |
| 2920 | * When written, doesn't tear down array, but just stops it |
| 2921 | * suspended (not supported yet) |
| 2922 | * All IO requests will block. The array can be reconfigured. |
| 2923 | * Writing this, if accepted, will block until array is quiescent |
| 2924 | * readonly |
| 2925 | * no resync can happen. no superblocks get written. |
| 2926 | * write requests fail |
| 2927 | * read-auto |
| 2928 | * like readonly, but behaves like 'clean' on a write request. |
| 2929 | * |
| 2930 | * clean - no pending writes, but otherwise active. |
| 2931 | * When written to inactive array, starts without resync |
| 2932 | * If a write request arrives then |
| 2933 | * if metadata is known, mark 'dirty' and switch to 'active'. |
| 2934 | * if not known, block and switch to write-pending |
| 2935 | * If written to an active array that has pending writes, then fails. |
| 2936 | * active |
| 2937 | * fully active: IO and resync can be happening. |
| 2938 | * When written to inactive array, starts with resync |
| 2939 | * |
| 2940 | * write-pending |
| 2941 | * clean, but writes are blocked waiting for 'active' to be written. |
| 2942 | * |
| 2943 | * active-idle |
| 2944 | * like active, but no writes have been seen for a while (100msec). |
| 2945 | * |
| 2946 | */ |
| 2947 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, |
| 2948 | write_pending, active_idle, bad_word}; |
| 2949 | static char *array_states[] = { |
| 2950 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
| 2951 | "write-pending", "active-idle", NULL }; |
| 2952 | |
| 2953 | static int match_word(const char *word, char **list) |
| 2954 | { |
| 2955 | int n; |
| 2956 | for (n=0; list[n]; n++) |
| 2957 | if (cmd_match(word, list[n])) |
| 2958 | break; |
| 2959 | return n; |
| 2960 | } |
| 2961 | |
| 2962 | static ssize_t |
| 2963 | array_state_show(mddev_t *mddev, char *page) |
| 2964 | { |
| 2965 | enum array_state st = inactive; |
| 2966 | |
| 2967 | if (mddev->pers) |
| 2968 | switch(mddev->ro) { |
| 2969 | case 1: |
| 2970 | st = readonly; |
| 2971 | break; |
| 2972 | case 2: |
| 2973 | st = read_auto; |
| 2974 | break; |
| 2975 | case 0: |
| 2976 | if (mddev->in_sync) |
| 2977 | st = clean; |
| 2978 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
| 2979 | st = write_pending; |
| 2980 | else if (mddev->safemode) |
| 2981 | st = active_idle; |
| 2982 | else |
| 2983 | st = active; |
| 2984 | } |
| 2985 | else { |
| 2986 | if (list_empty(&mddev->disks) && |
| 2987 | mddev->raid_disks == 0 && |
| 2988 | mddev->dev_sectors == 0) |
| 2989 | st = clear; |
| 2990 | else |
| 2991 | st = inactive; |
| 2992 | } |
| 2993 | return sprintf(page, "%s\n", array_states[st]); |
| 2994 | } |
| 2995 | |
| 2996 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
| 2997 | static int do_md_run(mddev_t * mddev); |
| 2998 | static int restart_array(mddev_t *mddev); |
| 2999 | |
| 3000 | static ssize_t |
| 3001 | array_state_store(mddev_t *mddev, const char *buf, size_t len) |
| 3002 | { |
| 3003 | int err = -EINVAL; |
| 3004 | enum array_state st = match_word(buf, array_states); |
| 3005 | switch(st) { |
| 3006 | case bad_word: |
| 3007 | break; |
| 3008 | case clear: |
| 3009 | /* stopping an active array */ |
| 3010 | if (atomic_read(&mddev->openers) > 0) |
| 3011 | return -EBUSY; |
| 3012 | err = do_md_stop(mddev, 0, 0); |
| 3013 | break; |
| 3014 | case inactive: |
| 3015 | /* stopping an active array */ |
| 3016 | if (mddev->pers) { |
| 3017 | if (atomic_read(&mddev->openers) > 0) |
| 3018 | return -EBUSY; |
| 3019 | err = do_md_stop(mddev, 2, 0); |
| 3020 | } else |
| 3021 | err = 0; /* already inactive */ |
| 3022 | break; |
| 3023 | case suspended: |
| 3024 | break; /* not supported yet */ |
| 3025 | case readonly: |
| 3026 | if (mddev->pers) |
| 3027 | err = do_md_stop(mddev, 1, 0); |
| 3028 | else { |
| 3029 | mddev->ro = 1; |
| 3030 | set_disk_ro(mddev->gendisk, 1); |
| 3031 | err = do_md_run(mddev); |
| 3032 | } |
| 3033 | break; |
| 3034 | case read_auto: |
| 3035 | if (mddev->pers) { |
| 3036 | if (mddev->ro == 0) |
| 3037 | err = do_md_stop(mddev, 1, 0); |
| 3038 | else if (mddev->ro == 1) |
| 3039 | err = restart_array(mddev); |
| 3040 | if (err == 0) { |
| 3041 | mddev->ro = 2; |
| 3042 | set_disk_ro(mddev->gendisk, 0); |
| 3043 | } |
| 3044 | } else { |
| 3045 | mddev->ro = 2; |
| 3046 | err = do_md_run(mddev); |
| 3047 | } |
| 3048 | break; |
| 3049 | case clean: |
| 3050 | if (mddev->pers) { |
| 3051 | restart_array(mddev); |
| 3052 | spin_lock_irq(&mddev->write_lock); |
| 3053 | if (atomic_read(&mddev->writes_pending) == 0) { |
| 3054 | if (mddev->in_sync == 0) { |
| 3055 | mddev->in_sync = 1; |
| 3056 | if (mddev->safemode == 1) |
| 3057 | mddev->safemode = 0; |
| 3058 | if (mddev->persistent) |
| 3059 | set_bit(MD_CHANGE_CLEAN, |
| 3060 | &mddev->flags); |
| 3061 | } |
| 3062 | err = 0; |
| 3063 | } else |
| 3064 | err = -EBUSY; |
| 3065 | spin_unlock_irq(&mddev->write_lock); |
| 3066 | } else { |
| 3067 | mddev->ro = 0; |
| 3068 | mddev->recovery_cp = MaxSector; |
| 3069 | err = do_md_run(mddev); |
| 3070 | } |
| 3071 | break; |
| 3072 | case active: |
| 3073 | if (mddev->pers) { |
| 3074 | restart_array(mddev); |
| 3075 | if (mddev->external) |
| 3076 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| 3077 | wake_up(&mddev->sb_wait); |
| 3078 | err = 0; |
| 3079 | } else { |
| 3080 | mddev->ro = 0; |
| 3081 | set_disk_ro(mddev->gendisk, 0); |
| 3082 | err = do_md_run(mddev); |
| 3083 | } |
| 3084 | break; |
| 3085 | case write_pending: |
| 3086 | case active_idle: |
| 3087 | /* these cannot be set */ |
| 3088 | break; |
| 3089 | } |
| 3090 | if (err) |
| 3091 | return err; |
| 3092 | else { |
| 3093 | sysfs_notify_dirent(mddev->sysfs_state); |
| 3094 | return len; |
| 3095 | } |
| 3096 | } |
| 3097 | static struct md_sysfs_entry md_array_state = |
| 3098 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
| 3099 | |
| 3100 | static ssize_t |
| 3101 | null_show(mddev_t *mddev, char *page) |
| 3102 | { |
| 3103 | return -EINVAL; |
| 3104 | } |
| 3105 | |
| 3106 | static ssize_t |
| 3107 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) |
| 3108 | { |
| 3109 | /* buf must be %d:%d\n? giving major and minor numbers */ |
| 3110 | /* The new device is added to the array. |
| 3111 | * If the array has a persistent superblock, we read the |
| 3112 | * superblock to initialise info and check validity. |
| 3113 | * Otherwise, only checking done is that in bind_rdev_to_array, |
| 3114 | * which mainly checks size. |
| 3115 | */ |
| 3116 | char *e; |
| 3117 | int major = simple_strtoul(buf, &e, 10); |
| 3118 | int minor; |
| 3119 | dev_t dev; |
| 3120 | mdk_rdev_t *rdev; |
| 3121 | int err; |
| 3122 | |
| 3123 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') |
| 3124 | return -EINVAL; |
| 3125 | minor = simple_strtoul(e+1, &e, 10); |
| 3126 | if (*e && *e != '\n') |
| 3127 | return -EINVAL; |
| 3128 | dev = MKDEV(major, minor); |
| 3129 | if (major != MAJOR(dev) || |
| 3130 | minor != MINOR(dev)) |
| 3131 | return -EOVERFLOW; |
| 3132 | |
| 3133 | |
| 3134 | if (mddev->persistent) { |
| 3135 | rdev = md_import_device(dev, mddev->major_version, |
| 3136 | mddev->minor_version); |
| 3137 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { |
| 3138 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, |
| 3139 | mdk_rdev_t, same_set); |
| 3140 | err = super_types[mddev->major_version] |
| 3141 | .load_super(rdev, rdev0, mddev->minor_version); |
| 3142 | if (err < 0) |
| 3143 | goto out; |
| 3144 | } |
| 3145 | } else if (mddev->external) |
| 3146 | rdev = md_import_device(dev, -2, -1); |
| 3147 | else |
| 3148 | rdev = md_import_device(dev, -1, -1); |
| 3149 | |
| 3150 | if (IS_ERR(rdev)) |
| 3151 | return PTR_ERR(rdev); |
| 3152 | err = bind_rdev_to_array(rdev, mddev); |
| 3153 | out: |
| 3154 | if (err) |
| 3155 | export_rdev(rdev); |
| 3156 | return err ? err : len; |
| 3157 | } |
| 3158 | |
| 3159 | static struct md_sysfs_entry md_new_device = |
| 3160 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
| 3161 | |
| 3162 | static ssize_t |
| 3163 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) |
| 3164 | { |
| 3165 | char *end; |
| 3166 | unsigned long chunk, end_chunk; |
| 3167 | |
| 3168 | if (!mddev->bitmap) |
| 3169 | goto out; |
| 3170 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ |
| 3171 | while (*buf) { |
| 3172 | chunk = end_chunk = simple_strtoul(buf, &end, 0); |
| 3173 | if (buf == end) break; |
| 3174 | if (*end == '-') { /* range */ |
| 3175 | buf = end + 1; |
| 3176 | end_chunk = simple_strtoul(buf, &end, 0); |
| 3177 | if (buf == end) break; |
| 3178 | } |
| 3179 | if (*end && !isspace(*end)) break; |
| 3180 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); |
| 3181 | buf = end; |
| 3182 | while (isspace(*buf)) buf++; |
| 3183 | } |
| 3184 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ |
| 3185 | out: |
| 3186 | return len; |
| 3187 | } |
| 3188 | |
| 3189 | static struct md_sysfs_entry md_bitmap = |
| 3190 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); |
| 3191 | |
| 3192 | static ssize_t |
| 3193 | size_show(mddev_t *mddev, char *page) |
| 3194 | { |
| 3195 | return sprintf(page, "%llu\n", |
| 3196 | (unsigned long long)mddev->dev_sectors / 2); |
| 3197 | } |
| 3198 | |
| 3199 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
| 3200 | |
| 3201 | static ssize_t |
| 3202 | size_store(mddev_t *mddev, const char *buf, size_t len) |
| 3203 | { |
| 3204 | /* If array is inactive, we can reduce the component size, but |
| 3205 | * not increase it (except from 0). |
| 3206 | * If array is active, we can try an on-line resize |
| 3207 | */ |
| 3208 | sector_t sectors; |
| 3209 | int err = strict_blocks_to_sectors(buf, §ors); |
| 3210 | |
| 3211 | if (err < 0) |
| 3212 | return err; |
| 3213 | if (mddev->pers) { |
| 3214 | err = update_size(mddev, sectors); |
| 3215 | md_update_sb(mddev, 1); |
| 3216 | } else { |
| 3217 | if (mddev->dev_sectors == 0 || |
| 3218 | mddev->dev_sectors > sectors) |
| 3219 | mddev->dev_sectors = sectors; |
| 3220 | else |
| 3221 | err = -ENOSPC; |
| 3222 | } |
| 3223 | return err ? err : len; |
| 3224 | } |
| 3225 | |
| 3226 | static struct md_sysfs_entry md_size = |
| 3227 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
| 3228 | |
| 3229 | |
| 3230 | /* Metdata version. |
| 3231 | * This is one of |
| 3232 | * 'none' for arrays with no metadata (good luck...) |
| 3233 | * 'external' for arrays with externally managed metadata, |
| 3234 | * or N.M for internally known formats |
| 3235 | */ |
| 3236 | static ssize_t |
| 3237 | metadata_show(mddev_t *mddev, char *page) |
| 3238 | { |
| 3239 | if (mddev->persistent) |
| 3240 | return sprintf(page, "%d.%d\n", |
| 3241 | mddev->major_version, mddev->minor_version); |
| 3242 | else if (mddev->external) |
| 3243 | return sprintf(page, "external:%s\n", mddev->metadata_type); |
| 3244 | else |
| 3245 | return sprintf(page, "none\n"); |
| 3246 | } |
| 3247 | |
| 3248 | static ssize_t |
| 3249 | metadata_store(mddev_t *mddev, const char *buf, size_t len) |
| 3250 | { |
| 3251 | int major, minor; |
| 3252 | char *e; |
| 3253 | /* Changing the details of 'external' metadata is |
| 3254 | * always permitted. Otherwise there must be |
| 3255 | * no devices attached to the array. |
| 3256 | */ |
| 3257 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
| 3258 | ; |
| 3259 | else if (!list_empty(&mddev->disks)) |
| 3260 | return -EBUSY; |
| 3261 | |
| 3262 | if (cmd_match(buf, "none")) { |
| 3263 | mddev->persistent = 0; |
| 3264 | mddev->external = 0; |
| 3265 | mddev->major_version = 0; |
| 3266 | mddev->minor_version = 90; |
| 3267 | return len; |
| 3268 | } |
| 3269 | if (strncmp(buf, "external:", 9) == 0) { |
| 3270 | size_t namelen = len-9; |
| 3271 | if (namelen >= sizeof(mddev->metadata_type)) |
| 3272 | namelen = sizeof(mddev->metadata_type)-1; |
| 3273 | strncpy(mddev->metadata_type, buf+9, namelen); |
| 3274 | mddev->metadata_type[namelen] = 0; |
| 3275 | if (namelen && mddev->metadata_type[namelen-1] == '\n') |
| 3276 | mddev->metadata_type[--namelen] = 0; |
| 3277 | mddev->persistent = 0; |
| 3278 | mddev->external = 1; |
| 3279 | mddev->major_version = 0; |
| 3280 | mddev->minor_version = 90; |
| 3281 | return len; |
| 3282 | } |
| 3283 | major = simple_strtoul(buf, &e, 10); |
| 3284 | if (e==buf || *e != '.') |
| 3285 | return -EINVAL; |
| 3286 | buf = e+1; |
| 3287 | minor = simple_strtoul(buf, &e, 10); |
| 3288 | if (e==buf || (*e && *e != '\n') ) |
| 3289 | return -EINVAL; |
| 3290 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
| 3291 | return -ENOENT; |
| 3292 | mddev->major_version = major; |
| 3293 | mddev->minor_version = minor; |
| 3294 | mddev->persistent = 1; |
| 3295 | mddev->external = 0; |
| 3296 | return len; |
| 3297 | } |
| 3298 | |
| 3299 | static struct md_sysfs_entry md_metadata = |
| 3300 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
| 3301 | |
| 3302 | static ssize_t |
| 3303 | action_show(mddev_t *mddev, char *page) |
| 3304 | { |
| 3305 | char *type = "idle"; |
| 3306 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| 3307 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
| 3308 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 3309 | type = "reshape"; |
| 3310 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| 3311 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| 3312 | type = "resync"; |
| 3313 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) |
| 3314 | type = "check"; |
| 3315 | else |
| 3316 | type = "repair"; |
| 3317 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
| 3318 | type = "recover"; |
| 3319 | } |
| 3320 | return sprintf(page, "%s\n", type); |
| 3321 | } |
| 3322 | |
| 3323 | static ssize_t |
| 3324 | action_store(mddev_t *mddev, const char *page, size_t len) |
| 3325 | { |
| 3326 | if (!mddev->pers || !mddev->pers->sync_request) |
| 3327 | return -EINVAL; |
| 3328 | |
| 3329 | if (cmd_match(page, "idle")) { |
| 3330 | if (mddev->sync_thread) { |
| 3331 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 3332 | md_unregister_thread(mddev->sync_thread); |
| 3333 | mddev->sync_thread = NULL; |
| 3334 | mddev->recovery = 0; |
| 3335 | } |
| 3336 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
| 3337 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
| 3338 | return -EBUSY; |
| 3339 | else if (cmd_match(page, "resync")) |
| 3340 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 3341 | else if (cmd_match(page, "recover")) { |
| 3342 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 3343 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 3344 | } else if (cmd_match(page, "reshape")) { |
| 3345 | int err; |
| 3346 | if (mddev->pers->start_reshape == NULL) |
| 3347 | return -EINVAL; |
| 3348 | err = mddev->pers->start_reshape(mddev); |
| 3349 | if (err) |
| 3350 | return err; |
| 3351 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| 3352 | } else { |
| 3353 | if (cmd_match(page, "check")) |
| 3354 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 3355 | else if (!cmd_match(page, "repair")) |
| 3356 | return -EINVAL; |
| 3357 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
| 3358 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 3359 | } |
| 3360 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 3361 | md_wakeup_thread(mddev->thread); |
| 3362 | sysfs_notify_dirent(mddev->sysfs_action); |
| 3363 | return len; |
| 3364 | } |
| 3365 | |
| 3366 | static ssize_t |
| 3367 | mismatch_cnt_show(mddev_t *mddev, char *page) |
| 3368 | { |
| 3369 | return sprintf(page, "%llu\n", |
| 3370 | (unsigned long long) mddev->resync_mismatches); |
| 3371 | } |
| 3372 | |
| 3373 | static struct md_sysfs_entry md_scan_mode = |
| 3374 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
| 3375 | |
| 3376 | |
| 3377 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
| 3378 | |
| 3379 | static ssize_t |
| 3380 | sync_min_show(mddev_t *mddev, char *page) |
| 3381 | { |
| 3382 | return sprintf(page, "%d (%s)\n", speed_min(mddev), |
| 3383 | mddev->sync_speed_min ? "local": "system"); |
| 3384 | } |
| 3385 | |
| 3386 | static ssize_t |
| 3387 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) |
| 3388 | { |
| 3389 | int min; |
| 3390 | char *e; |
| 3391 | if (strncmp(buf, "system", 6)==0) { |
| 3392 | mddev->sync_speed_min = 0; |
| 3393 | return len; |
| 3394 | } |
| 3395 | min = simple_strtoul(buf, &e, 10); |
| 3396 | if (buf == e || (*e && *e != '\n') || min <= 0) |
| 3397 | return -EINVAL; |
| 3398 | mddev->sync_speed_min = min; |
| 3399 | return len; |
| 3400 | } |
| 3401 | |
| 3402 | static struct md_sysfs_entry md_sync_min = |
| 3403 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); |
| 3404 | |
| 3405 | static ssize_t |
| 3406 | sync_max_show(mddev_t *mddev, char *page) |
| 3407 | { |
| 3408 | return sprintf(page, "%d (%s)\n", speed_max(mddev), |
| 3409 | mddev->sync_speed_max ? "local": "system"); |
| 3410 | } |
| 3411 | |
| 3412 | static ssize_t |
| 3413 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) |
| 3414 | { |
| 3415 | int max; |
| 3416 | char *e; |
| 3417 | if (strncmp(buf, "system", 6)==0) { |
| 3418 | mddev->sync_speed_max = 0; |
| 3419 | return len; |
| 3420 | } |
| 3421 | max = simple_strtoul(buf, &e, 10); |
| 3422 | if (buf == e || (*e && *e != '\n') || max <= 0) |
| 3423 | return -EINVAL; |
| 3424 | mddev->sync_speed_max = max; |
| 3425 | return len; |
| 3426 | } |
| 3427 | |
| 3428 | static struct md_sysfs_entry md_sync_max = |
| 3429 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); |
| 3430 | |
| 3431 | static ssize_t |
| 3432 | degraded_show(mddev_t *mddev, char *page) |
| 3433 | { |
| 3434 | return sprintf(page, "%d\n", mddev->degraded); |
| 3435 | } |
| 3436 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); |
| 3437 | |
| 3438 | static ssize_t |
| 3439 | sync_force_parallel_show(mddev_t *mddev, char *page) |
| 3440 | { |
| 3441 | return sprintf(page, "%d\n", mddev->parallel_resync); |
| 3442 | } |
| 3443 | |
| 3444 | static ssize_t |
| 3445 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) |
| 3446 | { |
| 3447 | long n; |
| 3448 | |
| 3449 | if (strict_strtol(buf, 10, &n)) |
| 3450 | return -EINVAL; |
| 3451 | |
| 3452 | if (n != 0 && n != 1) |
| 3453 | return -EINVAL; |
| 3454 | |
| 3455 | mddev->parallel_resync = n; |
| 3456 | |
| 3457 | if (mddev->sync_thread) |
| 3458 | wake_up(&resync_wait); |
| 3459 | |
| 3460 | return len; |
| 3461 | } |
| 3462 | |
| 3463 | /* force parallel resync, even with shared block devices */ |
| 3464 | static struct md_sysfs_entry md_sync_force_parallel = |
| 3465 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, |
| 3466 | sync_force_parallel_show, sync_force_parallel_store); |
| 3467 | |
| 3468 | static ssize_t |
| 3469 | sync_speed_show(mddev_t *mddev, char *page) |
| 3470 | { |
| 3471 | unsigned long resync, dt, db; |
| 3472 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
| 3473 | dt = (jiffies - mddev->resync_mark) / HZ; |
| 3474 | if (!dt) dt++; |
| 3475 | db = resync - mddev->resync_mark_cnt; |
| 3476 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ |
| 3477 | } |
| 3478 | |
| 3479 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
| 3480 | |
| 3481 | static ssize_t |
| 3482 | sync_completed_show(mddev_t *mddev, char *page) |
| 3483 | { |
| 3484 | unsigned long max_sectors, resync; |
| 3485 | |
| 3486 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
| 3487 | max_sectors = mddev->resync_max_sectors; |
| 3488 | else |
| 3489 | max_sectors = mddev->dev_sectors; |
| 3490 | |
| 3491 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); |
| 3492 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
| 3493 | } |
| 3494 | |
| 3495 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
| 3496 | |
| 3497 | static ssize_t |
| 3498 | min_sync_show(mddev_t *mddev, char *page) |
| 3499 | { |
| 3500 | return sprintf(page, "%llu\n", |
| 3501 | (unsigned long long)mddev->resync_min); |
| 3502 | } |
| 3503 | static ssize_t |
| 3504 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) |
| 3505 | { |
| 3506 | unsigned long long min; |
| 3507 | if (strict_strtoull(buf, 10, &min)) |
| 3508 | return -EINVAL; |
| 3509 | if (min > mddev->resync_max) |
| 3510 | return -EINVAL; |
| 3511 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 3512 | return -EBUSY; |
| 3513 | |
| 3514 | /* Must be a multiple of chunk_size */ |
| 3515 | if (mddev->chunk_size) { |
| 3516 | if (min & (sector_t)((mddev->chunk_size>>9)-1)) |
| 3517 | return -EINVAL; |
| 3518 | } |
| 3519 | mddev->resync_min = min; |
| 3520 | |
| 3521 | return len; |
| 3522 | } |
| 3523 | |
| 3524 | static struct md_sysfs_entry md_min_sync = |
| 3525 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); |
| 3526 | |
| 3527 | static ssize_t |
| 3528 | max_sync_show(mddev_t *mddev, char *page) |
| 3529 | { |
| 3530 | if (mddev->resync_max == MaxSector) |
| 3531 | return sprintf(page, "max\n"); |
| 3532 | else |
| 3533 | return sprintf(page, "%llu\n", |
| 3534 | (unsigned long long)mddev->resync_max); |
| 3535 | } |
| 3536 | static ssize_t |
| 3537 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) |
| 3538 | { |
| 3539 | if (strncmp(buf, "max", 3) == 0) |
| 3540 | mddev->resync_max = MaxSector; |
| 3541 | else { |
| 3542 | unsigned long long max; |
| 3543 | if (strict_strtoull(buf, 10, &max)) |
| 3544 | return -EINVAL; |
| 3545 | if (max < mddev->resync_min) |
| 3546 | return -EINVAL; |
| 3547 | if (max < mddev->resync_max && |
| 3548 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
| 3549 | return -EBUSY; |
| 3550 | |
| 3551 | /* Must be a multiple of chunk_size */ |
| 3552 | if (mddev->chunk_size) { |
| 3553 | if (max & (sector_t)((mddev->chunk_size>>9)-1)) |
| 3554 | return -EINVAL; |
| 3555 | } |
| 3556 | mddev->resync_max = max; |
| 3557 | } |
| 3558 | wake_up(&mddev->recovery_wait); |
| 3559 | return len; |
| 3560 | } |
| 3561 | |
| 3562 | static struct md_sysfs_entry md_max_sync = |
| 3563 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); |
| 3564 | |
| 3565 | static ssize_t |
| 3566 | suspend_lo_show(mddev_t *mddev, char *page) |
| 3567 | { |
| 3568 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); |
| 3569 | } |
| 3570 | |
| 3571 | static ssize_t |
| 3572 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) |
| 3573 | { |
| 3574 | char *e; |
| 3575 | unsigned long long new = simple_strtoull(buf, &e, 10); |
| 3576 | |
| 3577 | if (mddev->pers->quiesce == NULL) |
| 3578 | return -EINVAL; |
| 3579 | if (buf == e || (*e && *e != '\n')) |
| 3580 | return -EINVAL; |
| 3581 | if (new >= mddev->suspend_hi || |
| 3582 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { |
| 3583 | mddev->suspend_lo = new; |
| 3584 | mddev->pers->quiesce(mddev, 2); |
| 3585 | return len; |
| 3586 | } else |
| 3587 | return -EINVAL; |
| 3588 | } |
| 3589 | static struct md_sysfs_entry md_suspend_lo = |
| 3590 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); |
| 3591 | |
| 3592 | |
| 3593 | static ssize_t |
| 3594 | suspend_hi_show(mddev_t *mddev, char *page) |
| 3595 | { |
| 3596 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); |
| 3597 | } |
| 3598 | |
| 3599 | static ssize_t |
| 3600 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) |
| 3601 | { |
| 3602 | char *e; |
| 3603 | unsigned long long new = simple_strtoull(buf, &e, 10); |
| 3604 | |
| 3605 | if (mddev->pers->quiesce == NULL) |
| 3606 | return -EINVAL; |
| 3607 | if (buf == e || (*e && *e != '\n')) |
| 3608 | return -EINVAL; |
| 3609 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || |
| 3610 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { |
| 3611 | mddev->suspend_hi = new; |
| 3612 | mddev->pers->quiesce(mddev, 1); |
| 3613 | mddev->pers->quiesce(mddev, 0); |
| 3614 | return len; |
| 3615 | } else |
| 3616 | return -EINVAL; |
| 3617 | } |
| 3618 | static struct md_sysfs_entry md_suspend_hi = |
| 3619 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); |
| 3620 | |
| 3621 | static ssize_t |
| 3622 | reshape_position_show(mddev_t *mddev, char *page) |
| 3623 | { |
| 3624 | if (mddev->reshape_position != MaxSector) |
| 3625 | return sprintf(page, "%llu\n", |
| 3626 | (unsigned long long)mddev->reshape_position); |
| 3627 | strcpy(page, "none\n"); |
| 3628 | return 5; |
| 3629 | } |
| 3630 | |
| 3631 | static ssize_t |
| 3632 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) |
| 3633 | { |
| 3634 | char *e; |
| 3635 | unsigned long long new = simple_strtoull(buf, &e, 10); |
| 3636 | if (mddev->pers) |
| 3637 | return -EBUSY; |
| 3638 | if (buf == e || (*e && *e != '\n')) |
| 3639 | return -EINVAL; |
| 3640 | mddev->reshape_position = new; |
| 3641 | mddev->delta_disks = 0; |
| 3642 | mddev->new_level = mddev->level; |
| 3643 | mddev->new_layout = mddev->layout; |
| 3644 | mddev->new_chunk = mddev->chunk_size; |
| 3645 | return len; |
| 3646 | } |
| 3647 | |
| 3648 | static struct md_sysfs_entry md_reshape_position = |
| 3649 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, |
| 3650 | reshape_position_store); |
| 3651 | |
| 3652 | static ssize_t |
| 3653 | array_size_show(mddev_t *mddev, char *page) |
| 3654 | { |
| 3655 | if (mddev->external_size) |
| 3656 | return sprintf(page, "%llu\n", |
| 3657 | (unsigned long long)mddev->array_sectors/2); |
| 3658 | else |
| 3659 | return sprintf(page, "default\n"); |
| 3660 | } |
| 3661 | |
| 3662 | static ssize_t |
| 3663 | array_size_store(mddev_t *mddev, const char *buf, size_t len) |
| 3664 | { |
| 3665 | sector_t sectors; |
| 3666 | |
| 3667 | if (strncmp(buf, "default", 7) == 0) { |
| 3668 | if (mddev->pers) |
| 3669 | sectors = mddev->pers->size(mddev, 0, 0); |
| 3670 | else |
| 3671 | sectors = mddev->array_sectors; |
| 3672 | |
| 3673 | mddev->external_size = 0; |
| 3674 | } else { |
| 3675 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
| 3676 | return -EINVAL; |
| 3677 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) |
| 3678 | return -EINVAL; |
| 3679 | |
| 3680 | mddev->external_size = 1; |
| 3681 | } |
| 3682 | |
| 3683 | mddev->array_sectors = sectors; |
| 3684 | set_capacity(mddev->gendisk, mddev->array_sectors); |
| 3685 | if (mddev->pers) { |
| 3686 | struct block_device *bdev = bdget_disk(mddev->gendisk, 0); |
| 3687 | |
| 3688 | if (bdev) { |
| 3689 | mutex_lock(&bdev->bd_inode->i_mutex); |
| 3690 | i_size_write(bdev->bd_inode, |
| 3691 | (loff_t)mddev->array_sectors << 9); |
| 3692 | mutex_unlock(&bdev->bd_inode->i_mutex); |
| 3693 | bdput(bdev); |
| 3694 | } |
| 3695 | } |
| 3696 | |
| 3697 | return len; |
| 3698 | } |
| 3699 | |
| 3700 | static struct md_sysfs_entry md_array_size = |
| 3701 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, |
| 3702 | array_size_store); |
| 3703 | |
| 3704 | static struct attribute *md_default_attrs[] = { |
| 3705 | &md_level.attr, |
| 3706 | &md_layout.attr, |
| 3707 | &md_raid_disks.attr, |
| 3708 | &md_chunk_size.attr, |
| 3709 | &md_size.attr, |
| 3710 | &md_resync_start.attr, |
| 3711 | &md_metadata.attr, |
| 3712 | &md_new_device.attr, |
| 3713 | &md_safe_delay.attr, |
| 3714 | &md_array_state.attr, |
| 3715 | &md_reshape_position.attr, |
| 3716 | &md_array_size.attr, |
| 3717 | NULL, |
| 3718 | }; |
| 3719 | |
| 3720 | static struct attribute *md_redundancy_attrs[] = { |
| 3721 | &md_scan_mode.attr, |
| 3722 | &md_mismatches.attr, |
| 3723 | &md_sync_min.attr, |
| 3724 | &md_sync_max.attr, |
| 3725 | &md_sync_speed.attr, |
| 3726 | &md_sync_force_parallel.attr, |
| 3727 | &md_sync_completed.attr, |
| 3728 | &md_min_sync.attr, |
| 3729 | &md_max_sync.attr, |
| 3730 | &md_suspend_lo.attr, |
| 3731 | &md_suspend_hi.attr, |
| 3732 | &md_bitmap.attr, |
| 3733 | &md_degraded.attr, |
| 3734 | NULL, |
| 3735 | }; |
| 3736 | static struct attribute_group md_redundancy_group = { |
| 3737 | .name = NULL, |
| 3738 | .attrs = md_redundancy_attrs, |
| 3739 | }; |
| 3740 | |
| 3741 | |
| 3742 | static ssize_t |
| 3743 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) |
| 3744 | { |
| 3745 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); |
| 3746 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); |
| 3747 | ssize_t rv; |
| 3748 | |
| 3749 | if (!entry->show) |
| 3750 | return -EIO; |
| 3751 | rv = mddev_lock(mddev); |
| 3752 | if (!rv) { |
| 3753 | rv = entry->show(mddev, page); |
| 3754 | mddev_unlock(mddev); |
| 3755 | } |
| 3756 | return rv; |
| 3757 | } |
| 3758 | |
| 3759 | static ssize_t |
| 3760 | md_attr_store(struct kobject *kobj, struct attribute *attr, |
| 3761 | const char *page, size_t length) |
| 3762 | { |
| 3763 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); |
| 3764 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); |
| 3765 | ssize_t rv; |
| 3766 | |
| 3767 | if (!entry->store) |
| 3768 | return -EIO; |
| 3769 | if (!capable(CAP_SYS_ADMIN)) |
| 3770 | return -EACCES; |
| 3771 | rv = mddev_lock(mddev); |
| 3772 | if (mddev->hold_active == UNTIL_IOCTL) |
| 3773 | mddev->hold_active = 0; |
| 3774 | if (!rv) { |
| 3775 | rv = entry->store(mddev, page, length); |
| 3776 | mddev_unlock(mddev); |
| 3777 | } |
| 3778 | return rv; |
| 3779 | } |
| 3780 | |
| 3781 | static void md_free(struct kobject *ko) |
| 3782 | { |
| 3783 | mddev_t *mddev = container_of(ko, mddev_t, kobj); |
| 3784 | |
| 3785 | if (mddev->sysfs_state) |
| 3786 | sysfs_put(mddev->sysfs_state); |
| 3787 | |
| 3788 | if (mddev->gendisk) { |
| 3789 | del_gendisk(mddev->gendisk); |
| 3790 | put_disk(mddev->gendisk); |
| 3791 | } |
| 3792 | if (mddev->queue) |
| 3793 | blk_cleanup_queue(mddev->queue); |
| 3794 | |
| 3795 | kfree(mddev); |
| 3796 | } |
| 3797 | |
| 3798 | static struct sysfs_ops md_sysfs_ops = { |
| 3799 | .show = md_attr_show, |
| 3800 | .store = md_attr_store, |
| 3801 | }; |
| 3802 | static struct kobj_type md_ktype = { |
| 3803 | .release = md_free, |
| 3804 | .sysfs_ops = &md_sysfs_ops, |
| 3805 | .default_attrs = md_default_attrs, |
| 3806 | }; |
| 3807 | |
| 3808 | int mdp_major = 0; |
| 3809 | |
| 3810 | static int md_alloc(dev_t dev, char *name) |
| 3811 | { |
| 3812 | static DEFINE_MUTEX(disks_mutex); |
| 3813 | mddev_t *mddev = mddev_find(dev); |
| 3814 | struct gendisk *disk; |
| 3815 | int partitioned; |
| 3816 | int shift; |
| 3817 | int unit; |
| 3818 | int error; |
| 3819 | |
| 3820 | if (!mddev) |
| 3821 | return -ENODEV; |
| 3822 | |
| 3823 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); |
| 3824 | shift = partitioned ? MdpMinorShift : 0; |
| 3825 | unit = MINOR(mddev->unit) >> shift; |
| 3826 | |
| 3827 | /* wait for any previous instance if this device |
| 3828 | * to be completed removed (mddev_delayed_delete). |
| 3829 | */ |
| 3830 | flush_scheduled_work(); |
| 3831 | |
| 3832 | mutex_lock(&disks_mutex); |
| 3833 | if (mddev->gendisk) { |
| 3834 | mutex_unlock(&disks_mutex); |
| 3835 | mddev_put(mddev); |
| 3836 | return -EEXIST; |
| 3837 | } |
| 3838 | |
| 3839 | if (name) { |
| 3840 | /* Need to ensure that 'name' is not a duplicate. |
| 3841 | */ |
| 3842 | mddev_t *mddev2; |
| 3843 | spin_lock(&all_mddevs_lock); |
| 3844 | |
| 3845 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) |
| 3846 | if (mddev2->gendisk && |
| 3847 | strcmp(mddev2->gendisk->disk_name, name) == 0) { |
| 3848 | spin_unlock(&all_mddevs_lock); |
| 3849 | return -EEXIST; |
| 3850 | } |
| 3851 | spin_unlock(&all_mddevs_lock); |
| 3852 | } |
| 3853 | |
| 3854 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
| 3855 | if (!mddev->queue) { |
| 3856 | mutex_unlock(&disks_mutex); |
| 3857 | mddev_put(mddev); |
| 3858 | return -ENOMEM; |
| 3859 | } |
| 3860 | mddev->queue->queuedata = mddev; |
| 3861 | |
| 3862 | /* Can be unlocked because the queue is new: no concurrency */ |
| 3863 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); |
| 3864 | |
| 3865 | blk_queue_make_request(mddev->queue, md_make_request); |
| 3866 | |
| 3867 | disk = alloc_disk(1 << shift); |
| 3868 | if (!disk) { |
| 3869 | mutex_unlock(&disks_mutex); |
| 3870 | blk_cleanup_queue(mddev->queue); |
| 3871 | mddev->queue = NULL; |
| 3872 | mddev_put(mddev); |
| 3873 | return -ENOMEM; |
| 3874 | } |
| 3875 | disk->major = MAJOR(mddev->unit); |
| 3876 | disk->first_minor = unit << shift; |
| 3877 | if (name) |
| 3878 | strcpy(disk->disk_name, name); |
| 3879 | else if (partitioned) |
| 3880 | sprintf(disk->disk_name, "md_d%d", unit); |
| 3881 | else |
| 3882 | sprintf(disk->disk_name, "md%d", unit); |
| 3883 | disk->fops = &md_fops; |
| 3884 | disk->private_data = mddev; |
| 3885 | disk->queue = mddev->queue; |
| 3886 | /* Allow extended partitions. This makes the |
| 3887 | * 'mdp' device redundant, but we can't really |
| 3888 | * remove it now. |
| 3889 | */ |
| 3890 | disk->flags |= GENHD_FL_EXT_DEVT; |
| 3891 | add_disk(disk); |
| 3892 | mddev->gendisk = disk; |
| 3893 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
| 3894 | &disk_to_dev(disk)->kobj, "%s", "md"); |
| 3895 | mutex_unlock(&disks_mutex); |
| 3896 | if (error) |
| 3897 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
| 3898 | disk->disk_name); |
| 3899 | else { |
| 3900 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
| 3901 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
| 3902 | } |
| 3903 | mddev_put(mddev); |
| 3904 | return 0; |
| 3905 | } |
| 3906 | |
| 3907 | static struct kobject *md_probe(dev_t dev, int *part, void *data) |
| 3908 | { |
| 3909 | md_alloc(dev, NULL); |
| 3910 | return NULL; |
| 3911 | } |
| 3912 | |
| 3913 | static int add_named_array(const char *val, struct kernel_param *kp) |
| 3914 | { |
| 3915 | /* val must be "md_*" where * is not all digits. |
| 3916 | * We allocate an array with a large free minor number, and |
| 3917 | * set the name to val. val must not already be an active name. |
| 3918 | */ |
| 3919 | int len = strlen(val); |
| 3920 | char buf[DISK_NAME_LEN]; |
| 3921 | |
| 3922 | while (len && val[len-1] == '\n') |
| 3923 | len--; |
| 3924 | if (len >= DISK_NAME_LEN) |
| 3925 | return -E2BIG; |
| 3926 | strlcpy(buf, val, len+1); |
| 3927 | if (strncmp(buf, "md_", 3) != 0) |
| 3928 | return -EINVAL; |
| 3929 | return md_alloc(0, buf); |
| 3930 | } |
| 3931 | |
| 3932 | static void md_safemode_timeout(unsigned long data) |
| 3933 | { |
| 3934 | mddev_t *mddev = (mddev_t *) data; |
| 3935 | |
| 3936 | if (!atomic_read(&mddev->writes_pending)) { |
| 3937 | mddev->safemode = 1; |
| 3938 | if (mddev->external) |
| 3939 | sysfs_notify_dirent(mddev->sysfs_state); |
| 3940 | } |
| 3941 | md_wakeup_thread(mddev->thread); |
| 3942 | } |
| 3943 | |
| 3944 | static int start_dirty_degraded; |
| 3945 | |
| 3946 | static int do_md_run(mddev_t * mddev) |
| 3947 | { |
| 3948 | int err; |
| 3949 | int chunk_size; |
| 3950 | mdk_rdev_t *rdev; |
| 3951 | struct gendisk *disk; |
| 3952 | struct mdk_personality *pers; |
| 3953 | char b[BDEVNAME_SIZE]; |
| 3954 | |
| 3955 | if (list_empty(&mddev->disks)) |
| 3956 | /* cannot run an array with no devices.. */ |
| 3957 | return -EINVAL; |
| 3958 | |
| 3959 | if (mddev->pers) |
| 3960 | return -EBUSY; |
| 3961 | |
| 3962 | /* |
| 3963 | * Analyze all RAID superblock(s) |
| 3964 | */ |
| 3965 | if (!mddev->raid_disks) { |
| 3966 | if (!mddev->persistent) |
| 3967 | return -EINVAL; |
| 3968 | analyze_sbs(mddev); |
| 3969 | } |
| 3970 | |
| 3971 | chunk_size = mddev->chunk_size; |
| 3972 | |
| 3973 | if (chunk_size) { |
| 3974 | if (chunk_size > MAX_CHUNK_SIZE) { |
| 3975 | printk(KERN_ERR "too big chunk_size: %d > %d\n", |
| 3976 | chunk_size, MAX_CHUNK_SIZE); |
| 3977 | return -EINVAL; |
| 3978 | } |
| 3979 | /* |
| 3980 | * chunk-size has to be a power of 2 |
| 3981 | */ |
| 3982 | if ( (1 << ffz(~chunk_size)) != chunk_size) { |
| 3983 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
| 3984 | return -EINVAL; |
| 3985 | } |
| 3986 | |
| 3987 | /* devices must have minimum size of one chunk */ |
| 3988 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 3989 | if (test_bit(Faulty, &rdev->flags)) |
| 3990 | continue; |
| 3991 | if (rdev->sectors < chunk_size / 512) { |
| 3992 | printk(KERN_WARNING |
| 3993 | "md: Dev %s smaller than chunk_size:" |
| 3994 | " %llu < %d\n", |
| 3995 | bdevname(rdev->bdev,b), |
| 3996 | (unsigned long long)rdev->sectors, |
| 3997 | chunk_size / 512); |
| 3998 | return -EINVAL; |
| 3999 | } |
| 4000 | } |
| 4001 | } |
| 4002 | |
| 4003 | if (mddev->level != LEVEL_NONE) |
| 4004 | request_module("md-level-%d", mddev->level); |
| 4005 | else if (mddev->clevel[0]) |
| 4006 | request_module("md-%s", mddev->clevel); |
| 4007 | |
| 4008 | /* |
| 4009 | * Drop all container device buffers, from now on |
| 4010 | * the only valid external interface is through the md |
| 4011 | * device. |
| 4012 | */ |
| 4013 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 4014 | if (test_bit(Faulty, &rdev->flags)) |
| 4015 | continue; |
| 4016 | sync_blockdev(rdev->bdev); |
| 4017 | invalidate_bdev(rdev->bdev); |
| 4018 | |
| 4019 | /* perform some consistency tests on the device. |
| 4020 | * We don't want the data to overlap the metadata, |
| 4021 | * Internal Bitmap issues have been handled elsewhere. |
| 4022 | */ |
| 4023 | if (rdev->data_offset < rdev->sb_start) { |
| 4024 | if (mddev->dev_sectors && |
| 4025 | rdev->data_offset + mddev->dev_sectors |
| 4026 | > rdev->sb_start) { |
| 4027 | printk("md: %s: data overlaps metadata\n", |
| 4028 | mdname(mddev)); |
| 4029 | return -EINVAL; |
| 4030 | } |
| 4031 | } else { |
| 4032 | if (rdev->sb_start + rdev->sb_size/512 |
| 4033 | > rdev->data_offset) { |
| 4034 | printk("md: %s: metadata overlaps data\n", |
| 4035 | mdname(mddev)); |
| 4036 | return -EINVAL; |
| 4037 | } |
| 4038 | } |
| 4039 | sysfs_notify_dirent(rdev->sysfs_state); |
| 4040 | } |
| 4041 | |
| 4042 | md_probe(mddev->unit, NULL, NULL); |
| 4043 | disk = mddev->gendisk; |
| 4044 | if (!disk) |
| 4045 | return -ENOMEM; |
| 4046 | |
| 4047 | spin_lock(&pers_lock); |
| 4048 | pers = find_pers(mddev->level, mddev->clevel); |
| 4049 | if (!pers || !try_module_get(pers->owner)) { |
| 4050 | spin_unlock(&pers_lock); |
| 4051 | if (mddev->level != LEVEL_NONE) |
| 4052 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", |
| 4053 | mddev->level); |
| 4054 | else |
| 4055 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", |
| 4056 | mddev->clevel); |
| 4057 | return -EINVAL; |
| 4058 | } |
| 4059 | mddev->pers = pers; |
| 4060 | spin_unlock(&pers_lock); |
| 4061 | if (mddev->level != pers->level) { |
| 4062 | mddev->level = pers->level; |
| 4063 | mddev->new_level = pers->level; |
| 4064 | } |
| 4065 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
| 4066 | |
| 4067 | if (pers->level >= 4 && pers->level <= 6) |
| 4068 | /* Cannot support integrity (yet) */ |
| 4069 | blk_integrity_unregister(mddev->gendisk); |
| 4070 | |
| 4071 | if (mddev->reshape_position != MaxSector && |
| 4072 | pers->start_reshape == NULL) { |
| 4073 | /* This personality cannot handle reshaping... */ |
| 4074 | mddev->pers = NULL; |
| 4075 | module_put(pers->owner); |
| 4076 | return -EINVAL; |
| 4077 | } |
| 4078 | |
| 4079 | if (pers->sync_request) { |
| 4080 | /* Warn if this is a potentially silly |
| 4081 | * configuration. |
| 4082 | */ |
| 4083 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| 4084 | mdk_rdev_t *rdev2; |
| 4085 | int warned = 0; |
| 4086 | |
| 4087 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 4088 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
| 4089 | if (rdev < rdev2 && |
| 4090 | rdev->bdev->bd_contains == |
| 4091 | rdev2->bdev->bd_contains) { |
| 4092 | printk(KERN_WARNING |
| 4093 | "%s: WARNING: %s appears to be" |
| 4094 | " on the same physical disk as" |
| 4095 | " %s.\n", |
| 4096 | mdname(mddev), |
| 4097 | bdevname(rdev->bdev,b), |
| 4098 | bdevname(rdev2->bdev,b2)); |
| 4099 | warned = 1; |
| 4100 | } |
| 4101 | } |
| 4102 | |
| 4103 | if (warned) |
| 4104 | printk(KERN_WARNING |
| 4105 | "True protection against single-disk" |
| 4106 | " failure might be compromised.\n"); |
| 4107 | } |
| 4108 | |
| 4109 | mddev->recovery = 0; |
| 4110 | /* may be over-ridden by personality */ |
| 4111 | mddev->resync_max_sectors = mddev->dev_sectors; |
| 4112 | |
| 4113 | mddev->barriers_work = 1; |
| 4114 | mddev->ok_start_degraded = start_dirty_degraded; |
| 4115 | |
| 4116 | if (start_readonly) |
| 4117 | mddev->ro = 2; /* read-only, but switch on first write */ |
| 4118 | |
| 4119 | err = mddev->pers->run(mddev); |
| 4120 | if (err) |
| 4121 | printk(KERN_ERR "md: pers->run() failed ...\n"); |
| 4122 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
| 4123 | WARN_ONCE(!mddev->external_size, "%s: default size too small," |
| 4124 | " but 'external_size' not in effect?\n", __func__); |
| 4125 | printk(KERN_ERR |
| 4126 | "md: invalid array_size %llu > default size %llu\n", |
| 4127 | (unsigned long long)mddev->array_sectors / 2, |
| 4128 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); |
| 4129 | err = -EINVAL; |
| 4130 | mddev->pers->stop(mddev); |
| 4131 | } |
| 4132 | if (err == 0 && mddev->pers->sync_request) { |
| 4133 | err = bitmap_create(mddev); |
| 4134 | if (err) { |
| 4135 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
| 4136 | mdname(mddev), err); |
| 4137 | mddev->pers->stop(mddev); |
| 4138 | } |
| 4139 | } |
| 4140 | if (err) { |
| 4141 | module_put(mddev->pers->owner); |
| 4142 | mddev->pers = NULL; |
| 4143 | bitmap_destroy(mddev); |
| 4144 | return err; |
| 4145 | } |
| 4146 | if (mddev->pers->sync_request) { |
| 4147 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) |
| 4148 | printk(KERN_WARNING |
| 4149 | "md: cannot register extra attributes for %s\n", |
| 4150 | mdname(mddev)); |
| 4151 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
| 4152 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
| 4153 | mddev->ro = 0; |
| 4154 | |
| 4155 | atomic_set(&mddev->writes_pending,0); |
| 4156 | mddev->safemode = 0; |
| 4157 | mddev->safemode_timer.function = md_safemode_timeout; |
| 4158 | mddev->safemode_timer.data = (unsigned long) mddev; |
| 4159 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
| 4160 | mddev->in_sync = 1; |
| 4161 | |
| 4162 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 4163 | if (rdev->raid_disk >= 0) { |
| 4164 | char nm[20]; |
| 4165 | sprintf(nm, "rd%d", rdev->raid_disk); |
| 4166 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
| 4167 | printk("md: cannot register %s for %s\n", |
| 4168 | nm, mdname(mddev)); |
| 4169 | } |
| 4170 | |
| 4171 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 4172 | |
| 4173 | if (mddev->flags) |
| 4174 | md_update_sb(mddev, 0); |
| 4175 | |
| 4176 | set_capacity(disk, mddev->array_sectors); |
| 4177 | |
| 4178 | /* If there is a partially-recovered drive we need to |
| 4179 | * start recovery here. If we leave it to md_check_recovery, |
| 4180 | * it will remove the drives and not do the right thing |
| 4181 | */ |
| 4182 | if (mddev->degraded && !mddev->sync_thread) { |
| 4183 | int spares = 0; |
| 4184 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 4185 | if (rdev->raid_disk >= 0 && |
| 4186 | !test_bit(In_sync, &rdev->flags) && |
| 4187 | !test_bit(Faulty, &rdev->flags)) |
| 4188 | /* complete an interrupted recovery */ |
| 4189 | spares++; |
| 4190 | if (spares && mddev->pers->sync_request) { |
| 4191 | mddev->recovery = 0; |
| 4192 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 4193 | mddev->sync_thread = md_register_thread(md_do_sync, |
| 4194 | mddev, |
| 4195 | "%s_resync"); |
| 4196 | if (!mddev->sync_thread) { |
| 4197 | printk(KERN_ERR "%s: could not start resync" |
| 4198 | " thread...\n", |
| 4199 | mdname(mddev)); |
| 4200 | /* leave the spares where they are, it shouldn't hurt */ |
| 4201 | mddev->recovery = 0; |
| 4202 | } |
| 4203 | } |
| 4204 | } |
| 4205 | md_wakeup_thread(mddev->thread); |
| 4206 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ |
| 4207 | |
| 4208 | mddev->changed = 1; |
| 4209 | md_new_event(mddev); |
| 4210 | sysfs_notify_dirent(mddev->sysfs_state); |
| 4211 | if (mddev->sysfs_action) |
| 4212 | sysfs_notify_dirent(mddev->sysfs_action); |
| 4213 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
| 4214 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
| 4215 | return 0; |
| 4216 | } |
| 4217 | |
| 4218 | static int restart_array(mddev_t *mddev) |
| 4219 | { |
| 4220 | struct gendisk *disk = mddev->gendisk; |
| 4221 | |
| 4222 | /* Complain if it has no devices */ |
| 4223 | if (list_empty(&mddev->disks)) |
| 4224 | return -ENXIO; |
| 4225 | if (!mddev->pers) |
| 4226 | return -EINVAL; |
| 4227 | if (!mddev->ro) |
| 4228 | return -EBUSY; |
| 4229 | mddev->safemode = 0; |
| 4230 | mddev->ro = 0; |
| 4231 | set_disk_ro(disk, 0); |
| 4232 | printk(KERN_INFO "md: %s switched to read-write mode.\n", |
| 4233 | mdname(mddev)); |
| 4234 | /* Kick recovery or resync if necessary */ |
| 4235 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 4236 | md_wakeup_thread(mddev->thread); |
| 4237 | md_wakeup_thread(mddev->sync_thread); |
| 4238 | sysfs_notify_dirent(mddev->sysfs_state); |
| 4239 | return 0; |
| 4240 | } |
| 4241 | |
| 4242 | /* similar to deny_write_access, but accounts for our holding a reference |
| 4243 | * to the file ourselves */ |
| 4244 | static int deny_bitmap_write_access(struct file * file) |
| 4245 | { |
| 4246 | struct inode *inode = file->f_mapping->host; |
| 4247 | |
| 4248 | spin_lock(&inode->i_lock); |
| 4249 | if (atomic_read(&inode->i_writecount) > 1) { |
| 4250 | spin_unlock(&inode->i_lock); |
| 4251 | return -ETXTBSY; |
| 4252 | } |
| 4253 | atomic_set(&inode->i_writecount, -1); |
| 4254 | spin_unlock(&inode->i_lock); |
| 4255 | |
| 4256 | return 0; |
| 4257 | } |
| 4258 | |
| 4259 | static void restore_bitmap_write_access(struct file *file) |
| 4260 | { |
| 4261 | struct inode *inode = file->f_mapping->host; |
| 4262 | |
| 4263 | spin_lock(&inode->i_lock); |
| 4264 | atomic_set(&inode->i_writecount, 1); |
| 4265 | spin_unlock(&inode->i_lock); |
| 4266 | } |
| 4267 | |
| 4268 | /* mode: |
| 4269 | * 0 - completely stop and dis-assemble array |
| 4270 | * 1 - switch to readonly |
| 4271 | * 2 - stop but do not disassemble array |
| 4272 | */ |
| 4273 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
| 4274 | { |
| 4275 | int err = 0; |
| 4276 | struct gendisk *disk = mddev->gendisk; |
| 4277 | |
| 4278 | if (atomic_read(&mddev->openers) > is_open) { |
| 4279 | printk("md: %s still in use.\n",mdname(mddev)); |
| 4280 | return -EBUSY; |
| 4281 | } |
| 4282 | |
| 4283 | if (mddev->pers) { |
| 4284 | |
| 4285 | if (mddev->sync_thread) { |
| 4286 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 4287 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 4288 | md_unregister_thread(mddev->sync_thread); |
| 4289 | mddev->sync_thread = NULL; |
| 4290 | } |
| 4291 | |
| 4292 | del_timer_sync(&mddev->safemode_timer); |
| 4293 | |
| 4294 | switch(mode) { |
| 4295 | case 1: /* readonly */ |
| 4296 | err = -ENXIO; |
| 4297 | if (mddev->ro==1) |
| 4298 | goto out; |
| 4299 | mddev->ro = 1; |
| 4300 | break; |
| 4301 | case 0: /* disassemble */ |
| 4302 | case 2: /* stop */ |
| 4303 | bitmap_flush(mddev); |
| 4304 | md_super_wait(mddev); |
| 4305 | if (mddev->ro) |
| 4306 | set_disk_ro(disk, 0); |
| 4307 | |
| 4308 | mddev->pers->stop(mddev); |
| 4309 | mddev->queue->merge_bvec_fn = NULL; |
| 4310 | mddev->queue->unplug_fn = NULL; |
| 4311 | mddev->queue->backing_dev_info.congested_fn = NULL; |
| 4312 | if (mddev->pers->sync_request) { |
| 4313 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); |
| 4314 | if (mddev->sysfs_action) |
| 4315 | sysfs_put(mddev->sysfs_action); |
| 4316 | mddev->sysfs_action = NULL; |
| 4317 | } |
| 4318 | module_put(mddev->pers->owner); |
| 4319 | mddev->pers = NULL; |
| 4320 | /* tell userspace to handle 'inactive' */ |
| 4321 | sysfs_notify_dirent(mddev->sysfs_state); |
| 4322 | |
| 4323 | set_capacity(disk, 0); |
| 4324 | mddev->changed = 1; |
| 4325 | |
| 4326 | if (mddev->ro) |
| 4327 | mddev->ro = 0; |
| 4328 | } |
| 4329 | if (!mddev->in_sync || mddev->flags) { |
| 4330 | /* mark array as shutdown cleanly */ |
| 4331 | mddev->in_sync = 1; |
| 4332 | md_update_sb(mddev, 1); |
| 4333 | } |
| 4334 | if (mode == 1) |
| 4335 | set_disk_ro(disk, 1); |
| 4336 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
| 4337 | } |
| 4338 | |
| 4339 | /* |
| 4340 | * Free resources if final stop |
| 4341 | */ |
| 4342 | if (mode == 0) { |
| 4343 | mdk_rdev_t *rdev; |
| 4344 | |
| 4345 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
| 4346 | |
| 4347 | bitmap_destroy(mddev); |
| 4348 | if (mddev->bitmap_file) { |
| 4349 | restore_bitmap_write_access(mddev->bitmap_file); |
| 4350 | fput(mddev->bitmap_file); |
| 4351 | mddev->bitmap_file = NULL; |
| 4352 | } |
| 4353 | mddev->bitmap_offset = 0; |
| 4354 | |
| 4355 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 4356 | if (rdev->raid_disk >= 0) { |
| 4357 | char nm[20]; |
| 4358 | sprintf(nm, "rd%d", rdev->raid_disk); |
| 4359 | sysfs_remove_link(&mddev->kobj, nm); |
| 4360 | } |
| 4361 | |
| 4362 | /* make sure all md_delayed_delete calls have finished */ |
| 4363 | flush_scheduled_work(); |
| 4364 | |
| 4365 | export_array(mddev); |
| 4366 | |
| 4367 | mddev->array_sectors = 0; |
| 4368 | mddev->external_size = 0; |
| 4369 | mddev->dev_sectors = 0; |
| 4370 | mddev->raid_disks = 0; |
| 4371 | mddev->recovery_cp = 0; |
| 4372 | mddev->resync_min = 0; |
| 4373 | mddev->resync_max = MaxSector; |
| 4374 | mddev->reshape_position = MaxSector; |
| 4375 | mddev->external = 0; |
| 4376 | mddev->persistent = 0; |
| 4377 | mddev->level = LEVEL_NONE; |
| 4378 | mddev->clevel[0] = 0; |
| 4379 | mddev->flags = 0; |
| 4380 | mddev->ro = 0; |
| 4381 | mddev->metadata_type[0] = 0; |
| 4382 | mddev->chunk_size = 0; |
| 4383 | mddev->ctime = mddev->utime = 0; |
| 4384 | mddev->layout = 0; |
| 4385 | mddev->max_disks = 0; |
| 4386 | mddev->events = 0; |
| 4387 | mddev->delta_disks = 0; |
| 4388 | mddev->new_level = LEVEL_NONE; |
| 4389 | mddev->new_layout = 0; |
| 4390 | mddev->new_chunk = 0; |
| 4391 | mddev->curr_resync = 0; |
| 4392 | mddev->resync_mismatches = 0; |
| 4393 | mddev->suspend_lo = mddev->suspend_hi = 0; |
| 4394 | mddev->sync_speed_min = mddev->sync_speed_max = 0; |
| 4395 | mddev->recovery = 0; |
| 4396 | mddev->in_sync = 0; |
| 4397 | mddev->changed = 0; |
| 4398 | mddev->degraded = 0; |
| 4399 | mddev->barriers_work = 0; |
| 4400 | mddev->safemode = 0; |
| 4401 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
| 4402 | if (mddev->hold_active == UNTIL_STOP) |
| 4403 | mddev->hold_active = 0; |
| 4404 | |
| 4405 | } else if (mddev->pers) |
| 4406 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
| 4407 | mdname(mddev)); |
| 4408 | err = 0; |
| 4409 | blk_integrity_unregister(disk); |
| 4410 | md_new_event(mddev); |
| 4411 | sysfs_notify_dirent(mddev->sysfs_state); |
| 4412 | out: |
| 4413 | return err; |
| 4414 | } |
| 4415 | |
| 4416 | #ifndef MODULE |
| 4417 | static void autorun_array(mddev_t *mddev) |
| 4418 | { |
| 4419 | mdk_rdev_t *rdev; |
| 4420 | int err; |
| 4421 | |
| 4422 | if (list_empty(&mddev->disks)) |
| 4423 | return; |
| 4424 | |
| 4425 | printk(KERN_INFO "md: running: "); |
| 4426 | |
| 4427 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 4428 | char b[BDEVNAME_SIZE]; |
| 4429 | printk("<%s>", bdevname(rdev->bdev,b)); |
| 4430 | } |
| 4431 | printk("\n"); |
| 4432 | |
| 4433 | err = do_md_run(mddev); |
| 4434 | if (err) { |
| 4435 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); |
| 4436 | do_md_stop(mddev, 0, 0); |
| 4437 | } |
| 4438 | } |
| 4439 | |
| 4440 | /* |
| 4441 | * lets try to run arrays based on all disks that have arrived |
| 4442 | * until now. (those are in pending_raid_disks) |
| 4443 | * |
| 4444 | * the method: pick the first pending disk, collect all disks with |
| 4445 | * the same UUID, remove all from the pending list and put them into |
| 4446 | * the 'same_array' list. Then order this list based on superblock |
| 4447 | * update time (freshest comes first), kick out 'old' disks and |
| 4448 | * compare superblocks. If everything's fine then run it. |
| 4449 | * |
| 4450 | * If "unit" is allocated, then bump its reference count |
| 4451 | */ |
| 4452 | static void autorun_devices(int part) |
| 4453 | { |
| 4454 | mdk_rdev_t *rdev0, *rdev, *tmp; |
| 4455 | mddev_t *mddev; |
| 4456 | char b[BDEVNAME_SIZE]; |
| 4457 | |
| 4458 | printk(KERN_INFO "md: autorun ...\n"); |
| 4459 | while (!list_empty(&pending_raid_disks)) { |
| 4460 | int unit; |
| 4461 | dev_t dev; |
| 4462 | LIST_HEAD(candidates); |
| 4463 | rdev0 = list_entry(pending_raid_disks.next, |
| 4464 | mdk_rdev_t, same_set); |
| 4465 | |
| 4466 | printk(KERN_INFO "md: considering %s ...\n", |
| 4467 | bdevname(rdev0->bdev,b)); |
| 4468 | INIT_LIST_HEAD(&candidates); |
| 4469 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
| 4470 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
| 4471 | printk(KERN_INFO "md: adding %s ...\n", |
| 4472 | bdevname(rdev->bdev,b)); |
| 4473 | list_move(&rdev->same_set, &candidates); |
| 4474 | } |
| 4475 | /* |
| 4476 | * now we have a set of devices, with all of them having |
| 4477 | * mostly sane superblocks. It's time to allocate the |
| 4478 | * mddev. |
| 4479 | */ |
| 4480 | if (part) { |
| 4481 | dev = MKDEV(mdp_major, |
| 4482 | rdev0->preferred_minor << MdpMinorShift); |
| 4483 | unit = MINOR(dev) >> MdpMinorShift; |
| 4484 | } else { |
| 4485 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); |
| 4486 | unit = MINOR(dev); |
| 4487 | } |
| 4488 | if (rdev0->preferred_minor != unit) { |
| 4489 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
| 4490 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); |
| 4491 | break; |
| 4492 | } |
| 4493 | |
| 4494 | md_probe(dev, NULL, NULL); |
| 4495 | mddev = mddev_find(dev); |
| 4496 | if (!mddev || !mddev->gendisk) { |
| 4497 | if (mddev) |
| 4498 | mddev_put(mddev); |
| 4499 | printk(KERN_ERR |
| 4500 | "md: cannot allocate memory for md drive.\n"); |
| 4501 | break; |
| 4502 | } |
| 4503 | if (mddev_lock(mddev)) |
| 4504 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
| 4505 | mdname(mddev)); |
| 4506 | else if (mddev->raid_disks || mddev->major_version |
| 4507 | || !list_empty(&mddev->disks)) { |
| 4508 | printk(KERN_WARNING |
| 4509 | "md: %s already running, cannot run %s\n", |
| 4510 | mdname(mddev), bdevname(rdev0->bdev,b)); |
| 4511 | mddev_unlock(mddev); |
| 4512 | } else { |
| 4513 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); |
| 4514 | mddev->persistent = 1; |
| 4515 | rdev_for_each_list(rdev, tmp, &candidates) { |
| 4516 | list_del_init(&rdev->same_set); |
| 4517 | if (bind_rdev_to_array(rdev, mddev)) |
| 4518 | export_rdev(rdev); |
| 4519 | } |
| 4520 | autorun_array(mddev); |
| 4521 | mddev_unlock(mddev); |
| 4522 | } |
| 4523 | /* on success, candidates will be empty, on error |
| 4524 | * it won't... |
| 4525 | */ |
| 4526 | rdev_for_each_list(rdev, tmp, &candidates) { |
| 4527 | list_del_init(&rdev->same_set); |
| 4528 | export_rdev(rdev); |
| 4529 | } |
| 4530 | mddev_put(mddev); |
| 4531 | } |
| 4532 | printk(KERN_INFO "md: ... autorun DONE.\n"); |
| 4533 | } |
| 4534 | #endif /* !MODULE */ |
| 4535 | |
| 4536 | static int get_version(void __user * arg) |
| 4537 | { |
| 4538 | mdu_version_t ver; |
| 4539 | |
| 4540 | ver.major = MD_MAJOR_VERSION; |
| 4541 | ver.minor = MD_MINOR_VERSION; |
| 4542 | ver.patchlevel = MD_PATCHLEVEL_VERSION; |
| 4543 | |
| 4544 | if (copy_to_user(arg, &ver, sizeof(ver))) |
| 4545 | return -EFAULT; |
| 4546 | |
| 4547 | return 0; |
| 4548 | } |
| 4549 | |
| 4550 | static int get_array_info(mddev_t * mddev, void __user * arg) |
| 4551 | { |
| 4552 | mdu_array_info_t info; |
| 4553 | int nr,working,active,failed,spare; |
| 4554 | mdk_rdev_t *rdev; |
| 4555 | |
| 4556 | nr=working=active=failed=spare=0; |
| 4557 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 4558 | nr++; |
| 4559 | if (test_bit(Faulty, &rdev->flags)) |
| 4560 | failed++; |
| 4561 | else { |
| 4562 | working++; |
| 4563 | if (test_bit(In_sync, &rdev->flags)) |
| 4564 | active++; |
| 4565 | else |
| 4566 | spare++; |
| 4567 | } |
| 4568 | } |
| 4569 | |
| 4570 | info.major_version = mddev->major_version; |
| 4571 | info.minor_version = mddev->minor_version; |
| 4572 | info.patch_version = MD_PATCHLEVEL_VERSION; |
| 4573 | info.ctime = mddev->ctime; |
| 4574 | info.level = mddev->level; |
| 4575 | info.size = mddev->dev_sectors / 2; |
| 4576 | if (info.size != mddev->dev_sectors / 2) /* overflow */ |
| 4577 | info.size = -1; |
| 4578 | info.nr_disks = nr; |
| 4579 | info.raid_disks = mddev->raid_disks; |
| 4580 | info.md_minor = mddev->md_minor; |
| 4581 | info.not_persistent= !mddev->persistent; |
| 4582 | |
| 4583 | info.utime = mddev->utime; |
| 4584 | info.state = 0; |
| 4585 | if (mddev->in_sync) |
| 4586 | info.state = (1<<MD_SB_CLEAN); |
| 4587 | if (mddev->bitmap && mddev->bitmap_offset) |
| 4588 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
| 4589 | info.active_disks = active; |
| 4590 | info.working_disks = working; |
| 4591 | info.failed_disks = failed; |
| 4592 | info.spare_disks = spare; |
| 4593 | |
| 4594 | info.layout = mddev->layout; |
| 4595 | info.chunk_size = mddev->chunk_size; |
| 4596 | |
| 4597 | if (copy_to_user(arg, &info, sizeof(info))) |
| 4598 | return -EFAULT; |
| 4599 | |
| 4600 | return 0; |
| 4601 | } |
| 4602 | |
| 4603 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
| 4604 | { |
| 4605 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ |
| 4606 | char *ptr, *buf = NULL; |
| 4607 | int err = -ENOMEM; |
| 4608 | |
| 4609 | if (md_allow_write(mddev)) |
| 4610 | file = kmalloc(sizeof(*file), GFP_NOIO); |
| 4611 | else |
| 4612 | file = kmalloc(sizeof(*file), GFP_KERNEL); |
| 4613 | |
| 4614 | if (!file) |
| 4615 | goto out; |
| 4616 | |
| 4617 | /* bitmap disabled, zero the first byte and copy out */ |
| 4618 | if (!mddev->bitmap || !mddev->bitmap->file) { |
| 4619 | file->pathname[0] = '\0'; |
| 4620 | goto copy_out; |
| 4621 | } |
| 4622 | |
| 4623 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); |
| 4624 | if (!buf) |
| 4625 | goto out; |
| 4626 | |
| 4627 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
| 4628 | if (IS_ERR(ptr)) |
| 4629 | goto out; |
| 4630 | |
| 4631 | strcpy(file->pathname, ptr); |
| 4632 | |
| 4633 | copy_out: |
| 4634 | err = 0; |
| 4635 | if (copy_to_user(arg, file, sizeof(*file))) |
| 4636 | err = -EFAULT; |
| 4637 | out: |
| 4638 | kfree(buf); |
| 4639 | kfree(file); |
| 4640 | return err; |
| 4641 | } |
| 4642 | |
| 4643 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
| 4644 | { |
| 4645 | mdu_disk_info_t info; |
| 4646 | mdk_rdev_t *rdev; |
| 4647 | |
| 4648 | if (copy_from_user(&info, arg, sizeof(info))) |
| 4649 | return -EFAULT; |
| 4650 | |
| 4651 | rdev = find_rdev_nr(mddev, info.number); |
| 4652 | if (rdev) { |
| 4653 | info.major = MAJOR(rdev->bdev->bd_dev); |
| 4654 | info.minor = MINOR(rdev->bdev->bd_dev); |
| 4655 | info.raid_disk = rdev->raid_disk; |
| 4656 | info.state = 0; |
| 4657 | if (test_bit(Faulty, &rdev->flags)) |
| 4658 | info.state |= (1<<MD_DISK_FAULTY); |
| 4659 | else if (test_bit(In_sync, &rdev->flags)) { |
| 4660 | info.state |= (1<<MD_DISK_ACTIVE); |
| 4661 | info.state |= (1<<MD_DISK_SYNC); |
| 4662 | } |
| 4663 | if (test_bit(WriteMostly, &rdev->flags)) |
| 4664 | info.state |= (1<<MD_DISK_WRITEMOSTLY); |
| 4665 | } else { |
| 4666 | info.major = info.minor = 0; |
| 4667 | info.raid_disk = -1; |
| 4668 | info.state = (1<<MD_DISK_REMOVED); |
| 4669 | } |
| 4670 | |
| 4671 | if (copy_to_user(arg, &info, sizeof(info))) |
| 4672 | return -EFAULT; |
| 4673 | |
| 4674 | return 0; |
| 4675 | } |
| 4676 | |
| 4677 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) |
| 4678 | { |
| 4679 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
| 4680 | mdk_rdev_t *rdev; |
| 4681 | dev_t dev = MKDEV(info->major,info->minor); |
| 4682 | |
| 4683 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) |
| 4684 | return -EOVERFLOW; |
| 4685 | |
| 4686 | if (!mddev->raid_disks) { |
| 4687 | int err; |
| 4688 | /* expecting a device which has a superblock */ |
| 4689 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); |
| 4690 | if (IS_ERR(rdev)) { |
| 4691 | printk(KERN_WARNING |
| 4692 | "md: md_import_device returned %ld\n", |
| 4693 | PTR_ERR(rdev)); |
| 4694 | return PTR_ERR(rdev); |
| 4695 | } |
| 4696 | if (!list_empty(&mddev->disks)) { |
| 4697 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, |
| 4698 | mdk_rdev_t, same_set); |
| 4699 | int err = super_types[mddev->major_version] |
| 4700 | .load_super(rdev, rdev0, mddev->minor_version); |
| 4701 | if (err < 0) { |
| 4702 | printk(KERN_WARNING |
| 4703 | "md: %s has different UUID to %s\n", |
| 4704 | bdevname(rdev->bdev,b), |
| 4705 | bdevname(rdev0->bdev,b2)); |
| 4706 | export_rdev(rdev); |
| 4707 | return -EINVAL; |
| 4708 | } |
| 4709 | } |
| 4710 | err = bind_rdev_to_array(rdev, mddev); |
| 4711 | if (err) |
| 4712 | export_rdev(rdev); |
| 4713 | return err; |
| 4714 | } |
| 4715 | |
| 4716 | /* |
| 4717 | * add_new_disk can be used once the array is assembled |
| 4718 | * to add "hot spares". They must already have a superblock |
| 4719 | * written |
| 4720 | */ |
| 4721 | if (mddev->pers) { |
| 4722 | int err; |
| 4723 | if (!mddev->pers->hot_add_disk) { |
| 4724 | printk(KERN_WARNING |
| 4725 | "%s: personality does not support diskops!\n", |
| 4726 | mdname(mddev)); |
| 4727 | return -EINVAL; |
| 4728 | } |
| 4729 | if (mddev->persistent) |
| 4730 | rdev = md_import_device(dev, mddev->major_version, |
| 4731 | mddev->minor_version); |
| 4732 | else |
| 4733 | rdev = md_import_device(dev, -1, -1); |
| 4734 | if (IS_ERR(rdev)) { |
| 4735 | printk(KERN_WARNING |
| 4736 | "md: md_import_device returned %ld\n", |
| 4737 | PTR_ERR(rdev)); |
| 4738 | return PTR_ERR(rdev); |
| 4739 | } |
| 4740 | /* set save_raid_disk if appropriate */ |
| 4741 | if (!mddev->persistent) { |
| 4742 | if (info->state & (1<<MD_DISK_SYNC) && |
| 4743 | info->raid_disk < mddev->raid_disks) |
| 4744 | rdev->raid_disk = info->raid_disk; |
| 4745 | else |
| 4746 | rdev->raid_disk = -1; |
| 4747 | } else |
| 4748 | super_types[mddev->major_version]. |
| 4749 | validate_super(mddev, rdev); |
| 4750 | rdev->saved_raid_disk = rdev->raid_disk; |
| 4751 | |
| 4752 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
| 4753 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
| 4754 | set_bit(WriteMostly, &rdev->flags); |
| 4755 | else |
| 4756 | clear_bit(WriteMostly, &rdev->flags); |
| 4757 | |
| 4758 | rdev->raid_disk = -1; |
| 4759 | err = bind_rdev_to_array(rdev, mddev); |
| 4760 | if (!err && !mddev->pers->hot_remove_disk) { |
| 4761 | /* If there is hot_add_disk but no hot_remove_disk |
| 4762 | * then added disks for geometry changes, |
| 4763 | * and should be added immediately. |
| 4764 | */ |
| 4765 | super_types[mddev->major_version]. |
| 4766 | validate_super(mddev, rdev); |
| 4767 | err = mddev->pers->hot_add_disk(mddev, rdev); |
| 4768 | if (err) |
| 4769 | unbind_rdev_from_array(rdev); |
| 4770 | } |
| 4771 | if (err) |
| 4772 | export_rdev(rdev); |
| 4773 | else |
| 4774 | sysfs_notify_dirent(rdev->sysfs_state); |
| 4775 | |
| 4776 | md_update_sb(mddev, 1); |
| 4777 | if (mddev->degraded) |
| 4778 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 4779 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 4780 | md_wakeup_thread(mddev->thread); |
| 4781 | return err; |
| 4782 | } |
| 4783 | |
| 4784 | /* otherwise, add_new_disk is only allowed |
| 4785 | * for major_version==0 superblocks |
| 4786 | */ |
| 4787 | if (mddev->major_version != 0) { |
| 4788 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", |
| 4789 | mdname(mddev)); |
| 4790 | return -EINVAL; |
| 4791 | } |
| 4792 | |
| 4793 | if (!(info->state & (1<<MD_DISK_FAULTY))) { |
| 4794 | int err; |
| 4795 | rdev = md_import_device(dev, -1, 0); |
| 4796 | if (IS_ERR(rdev)) { |
| 4797 | printk(KERN_WARNING |
| 4798 | "md: error, md_import_device() returned %ld\n", |
| 4799 | PTR_ERR(rdev)); |
| 4800 | return PTR_ERR(rdev); |
| 4801 | } |
| 4802 | rdev->desc_nr = info->number; |
| 4803 | if (info->raid_disk < mddev->raid_disks) |
| 4804 | rdev->raid_disk = info->raid_disk; |
| 4805 | else |
| 4806 | rdev->raid_disk = -1; |
| 4807 | |
| 4808 | if (rdev->raid_disk < mddev->raid_disks) |
| 4809 | if (info->state & (1<<MD_DISK_SYNC)) |
| 4810 | set_bit(In_sync, &rdev->flags); |
| 4811 | |
| 4812 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
| 4813 | set_bit(WriteMostly, &rdev->flags); |
| 4814 | |
| 4815 | if (!mddev->persistent) { |
| 4816 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); |
| 4817 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
| 4818 | } else |
| 4819 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
| 4820 | rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size); |
| 4821 | |
| 4822 | err = bind_rdev_to_array(rdev, mddev); |
| 4823 | if (err) { |
| 4824 | export_rdev(rdev); |
| 4825 | return err; |
| 4826 | } |
| 4827 | } |
| 4828 | |
| 4829 | return 0; |
| 4830 | } |
| 4831 | |
| 4832 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) |
| 4833 | { |
| 4834 | char b[BDEVNAME_SIZE]; |
| 4835 | mdk_rdev_t *rdev; |
| 4836 | |
| 4837 | rdev = find_rdev(mddev, dev); |
| 4838 | if (!rdev) |
| 4839 | return -ENXIO; |
| 4840 | |
| 4841 | if (rdev->raid_disk >= 0) |
| 4842 | goto busy; |
| 4843 | |
| 4844 | kick_rdev_from_array(rdev); |
| 4845 | md_update_sb(mddev, 1); |
| 4846 | md_new_event(mddev); |
| 4847 | |
| 4848 | return 0; |
| 4849 | busy: |
| 4850 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
| 4851 | bdevname(rdev->bdev,b), mdname(mddev)); |
| 4852 | return -EBUSY; |
| 4853 | } |
| 4854 | |
| 4855 | static int hot_add_disk(mddev_t * mddev, dev_t dev) |
| 4856 | { |
| 4857 | char b[BDEVNAME_SIZE]; |
| 4858 | int err; |
| 4859 | mdk_rdev_t *rdev; |
| 4860 | |
| 4861 | if (!mddev->pers) |
| 4862 | return -ENODEV; |
| 4863 | |
| 4864 | if (mddev->major_version != 0) { |
| 4865 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" |
| 4866 | " version-0 superblocks.\n", |
| 4867 | mdname(mddev)); |
| 4868 | return -EINVAL; |
| 4869 | } |
| 4870 | if (!mddev->pers->hot_add_disk) { |
| 4871 | printk(KERN_WARNING |
| 4872 | "%s: personality does not support diskops!\n", |
| 4873 | mdname(mddev)); |
| 4874 | return -EINVAL; |
| 4875 | } |
| 4876 | |
| 4877 | rdev = md_import_device(dev, -1, 0); |
| 4878 | if (IS_ERR(rdev)) { |
| 4879 | printk(KERN_WARNING |
| 4880 | "md: error, md_import_device() returned %ld\n", |
| 4881 | PTR_ERR(rdev)); |
| 4882 | return -EINVAL; |
| 4883 | } |
| 4884 | |
| 4885 | if (mddev->persistent) |
| 4886 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
| 4887 | else |
| 4888 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
| 4889 | |
| 4890 | rdev->sectors = calc_num_sectors(rdev, mddev->chunk_size); |
| 4891 | |
| 4892 | if (test_bit(Faulty, &rdev->flags)) { |
| 4893 | printk(KERN_WARNING |
| 4894 | "md: can not hot-add faulty %s disk to %s!\n", |
| 4895 | bdevname(rdev->bdev,b), mdname(mddev)); |
| 4896 | err = -EINVAL; |
| 4897 | goto abort_export; |
| 4898 | } |
| 4899 | clear_bit(In_sync, &rdev->flags); |
| 4900 | rdev->desc_nr = -1; |
| 4901 | rdev->saved_raid_disk = -1; |
| 4902 | err = bind_rdev_to_array(rdev, mddev); |
| 4903 | if (err) |
| 4904 | goto abort_export; |
| 4905 | |
| 4906 | /* |
| 4907 | * The rest should better be atomic, we can have disk failures |
| 4908 | * noticed in interrupt contexts ... |
| 4909 | */ |
| 4910 | |
| 4911 | rdev->raid_disk = -1; |
| 4912 | |
| 4913 | md_update_sb(mddev, 1); |
| 4914 | |
| 4915 | /* |
| 4916 | * Kick recovery, maybe this spare has to be added to the |
| 4917 | * array immediately. |
| 4918 | */ |
| 4919 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 4920 | md_wakeup_thread(mddev->thread); |
| 4921 | md_new_event(mddev); |
| 4922 | return 0; |
| 4923 | |
| 4924 | abort_export: |
| 4925 | export_rdev(rdev); |
| 4926 | return err; |
| 4927 | } |
| 4928 | |
| 4929 | static int set_bitmap_file(mddev_t *mddev, int fd) |
| 4930 | { |
| 4931 | int err; |
| 4932 | |
| 4933 | if (mddev->pers) { |
| 4934 | if (!mddev->pers->quiesce) |
| 4935 | return -EBUSY; |
| 4936 | if (mddev->recovery || mddev->sync_thread) |
| 4937 | return -EBUSY; |
| 4938 | /* we should be able to change the bitmap.. */ |
| 4939 | } |
| 4940 | |
| 4941 | |
| 4942 | if (fd >= 0) { |
| 4943 | if (mddev->bitmap) |
| 4944 | return -EEXIST; /* cannot add when bitmap is present */ |
| 4945 | mddev->bitmap_file = fget(fd); |
| 4946 | |
| 4947 | if (mddev->bitmap_file == NULL) { |
| 4948 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
| 4949 | mdname(mddev)); |
| 4950 | return -EBADF; |
| 4951 | } |
| 4952 | |
| 4953 | err = deny_bitmap_write_access(mddev->bitmap_file); |
| 4954 | if (err) { |
| 4955 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
| 4956 | mdname(mddev)); |
| 4957 | fput(mddev->bitmap_file); |
| 4958 | mddev->bitmap_file = NULL; |
| 4959 | return err; |
| 4960 | } |
| 4961 | mddev->bitmap_offset = 0; /* file overrides offset */ |
| 4962 | } else if (mddev->bitmap == NULL) |
| 4963 | return -ENOENT; /* cannot remove what isn't there */ |
| 4964 | err = 0; |
| 4965 | if (mddev->pers) { |
| 4966 | mddev->pers->quiesce(mddev, 1); |
| 4967 | if (fd >= 0) |
| 4968 | err = bitmap_create(mddev); |
| 4969 | if (fd < 0 || err) { |
| 4970 | bitmap_destroy(mddev); |
| 4971 | fd = -1; /* make sure to put the file */ |
| 4972 | } |
| 4973 | mddev->pers->quiesce(mddev, 0); |
| 4974 | } |
| 4975 | if (fd < 0) { |
| 4976 | if (mddev->bitmap_file) { |
| 4977 | restore_bitmap_write_access(mddev->bitmap_file); |
| 4978 | fput(mddev->bitmap_file); |
| 4979 | } |
| 4980 | mddev->bitmap_file = NULL; |
| 4981 | } |
| 4982 | |
| 4983 | return err; |
| 4984 | } |
| 4985 | |
| 4986 | /* |
| 4987 | * set_array_info is used two different ways |
| 4988 | * The original usage is when creating a new array. |
| 4989 | * In this usage, raid_disks is > 0 and it together with |
| 4990 | * level, size, not_persistent,layout,chunksize determine the |
| 4991 | * shape of the array. |
| 4992 | * This will always create an array with a type-0.90.0 superblock. |
| 4993 | * The newer usage is when assembling an array. |
| 4994 | * In this case raid_disks will be 0, and the major_version field is |
| 4995 | * use to determine which style super-blocks are to be found on the devices. |
| 4996 | * The minor and patch _version numbers are also kept incase the |
| 4997 | * super_block handler wishes to interpret them. |
| 4998 | */ |
| 4999 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) |
| 5000 | { |
| 5001 | |
| 5002 | if (info->raid_disks == 0) { |
| 5003 | /* just setting version number for superblock loading */ |
| 5004 | if (info->major_version < 0 || |
| 5005 | info->major_version >= ARRAY_SIZE(super_types) || |
| 5006 | super_types[info->major_version].name == NULL) { |
| 5007 | /* maybe try to auto-load a module? */ |
| 5008 | printk(KERN_INFO |
| 5009 | "md: superblock version %d not known\n", |
| 5010 | info->major_version); |
| 5011 | return -EINVAL; |
| 5012 | } |
| 5013 | mddev->major_version = info->major_version; |
| 5014 | mddev->minor_version = info->minor_version; |
| 5015 | mddev->patch_version = info->patch_version; |
| 5016 | mddev->persistent = !info->not_persistent; |
| 5017 | return 0; |
| 5018 | } |
| 5019 | mddev->major_version = MD_MAJOR_VERSION; |
| 5020 | mddev->minor_version = MD_MINOR_VERSION; |
| 5021 | mddev->patch_version = MD_PATCHLEVEL_VERSION; |
| 5022 | mddev->ctime = get_seconds(); |
| 5023 | |
| 5024 | mddev->level = info->level; |
| 5025 | mddev->clevel[0] = 0; |
| 5026 | mddev->dev_sectors = 2 * (sector_t)info->size; |
| 5027 | mddev->raid_disks = info->raid_disks; |
| 5028 | /* don't set md_minor, it is determined by which /dev/md* was |
| 5029 | * openned |
| 5030 | */ |
| 5031 | if (info->state & (1<<MD_SB_CLEAN)) |
| 5032 | mddev->recovery_cp = MaxSector; |
| 5033 | else |
| 5034 | mddev->recovery_cp = 0; |
| 5035 | mddev->persistent = ! info->not_persistent; |
| 5036 | mddev->external = 0; |
| 5037 | |
| 5038 | mddev->layout = info->layout; |
| 5039 | mddev->chunk_size = info->chunk_size; |
| 5040 | |
| 5041 | mddev->max_disks = MD_SB_DISKS; |
| 5042 | |
| 5043 | if (mddev->persistent) |
| 5044 | mddev->flags = 0; |
| 5045 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| 5046 | |
| 5047 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
| 5048 | mddev->bitmap_offset = 0; |
| 5049 | |
| 5050 | mddev->reshape_position = MaxSector; |
| 5051 | |
| 5052 | /* |
| 5053 | * Generate a 128 bit UUID |
| 5054 | */ |
| 5055 | get_random_bytes(mddev->uuid, 16); |
| 5056 | |
| 5057 | mddev->new_level = mddev->level; |
| 5058 | mddev->new_chunk = mddev->chunk_size; |
| 5059 | mddev->new_layout = mddev->layout; |
| 5060 | mddev->delta_disks = 0; |
| 5061 | |
| 5062 | return 0; |
| 5063 | } |
| 5064 | |
| 5065 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
| 5066 | { |
| 5067 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
| 5068 | |
| 5069 | if (mddev->external_size) |
| 5070 | return; |
| 5071 | |
| 5072 | mddev->array_sectors = array_sectors; |
| 5073 | } |
| 5074 | EXPORT_SYMBOL(md_set_array_sectors); |
| 5075 | |
| 5076 | void md_set_array_sectors_lock(mddev_t *mddev, sector_t array_sectors) |
| 5077 | { |
| 5078 | mddev_lock(mddev); |
| 5079 | md_set_array_sectors(mddev, array_sectors); |
| 5080 | mddev_unlock(mddev); |
| 5081 | } |
| 5082 | EXPORT_SYMBOL(md_set_array_sectors_lock); |
| 5083 | |
| 5084 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
| 5085 | { |
| 5086 | mdk_rdev_t *rdev; |
| 5087 | int rv; |
| 5088 | int fit = (num_sectors == 0); |
| 5089 | |
| 5090 | if (mddev->pers->resize == NULL) |
| 5091 | return -EINVAL; |
| 5092 | /* The "num_sectors" is the number of sectors of each device that |
| 5093 | * is used. This can only make sense for arrays with redundancy. |
| 5094 | * linear and raid0 always use whatever space is available. We can only |
| 5095 | * consider changing this number if no resync or reconstruction is |
| 5096 | * happening, and if the new size is acceptable. It must fit before the |
| 5097 | * sb_start or, if that is <data_offset, it must fit before the size |
| 5098 | * of each device. If num_sectors is zero, we find the largest size |
| 5099 | * that fits. |
| 5100 | |
| 5101 | */ |
| 5102 | if (mddev->sync_thread) |
| 5103 | return -EBUSY; |
| 5104 | if (mddev->bitmap) |
| 5105 | /* Sorry, cannot grow a bitmap yet, just remove it, |
| 5106 | * grow, and re-add. |
| 5107 | */ |
| 5108 | return -EBUSY; |
| 5109 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 5110 | sector_t avail = rdev->sectors; |
| 5111 | |
| 5112 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
| 5113 | num_sectors = avail; |
| 5114 | if (avail < num_sectors) |
| 5115 | return -ENOSPC; |
| 5116 | } |
| 5117 | rv = mddev->pers->resize(mddev, num_sectors); |
| 5118 | if (!rv) { |
| 5119 | struct block_device *bdev; |
| 5120 | |
| 5121 | bdev = bdget_disk(mddev->gendisk, 0); |
| 5122 | if (bdev) { |
| 5123 | mutex_lock(&bdev->bd_inode->i_mutex); |
| 5124 | i_size_write(bdev->bd_inode, |
| 5125 | (loff_t)mddev->array_sectors << 9); |
| 5126 | mutex_unlock(&bdev->bd_inode->i_mutex); |
| 5127 | bdput(bdev); |
| 5128 | } |
| 5129 | } |
| 5130 | return rv; |
| 5131 | } |
| 5132 | |
| 5133 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
| 5134 | { |
| 5135 | int rv; |
| 5136 | /* change the number of raid disks */ |
| 5137 | if (mddev->pers->check_reshape == NULL) |
| 5138 | return -EINVAL; |
| 5139 | if (raid_disks <= 0 || |
| 5140 | raid_disks >= mddev->max_disks) |
| 5141 | return -EINVAL; |
| 5142 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
| 5143 | return -EBUSY; |
| 5144 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
| 5145 | |
| 5146 | rv = mddev->pers->check_reshape(mddev); |
| 5147 | return rv; |
| 5148 | } |
| 5149 | |
| 5150 | |
| 5151 | /* |
| 5152 | * update_array_info is used to change the configuration of an |
| 5153 | * on-line array. |
| 5154 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size |
| 5155 | * fields in the info are checked against the array. |
| 5156 | * Any differences that cannot be handled will cause an error. |
| 5157 | * Normally, only one change can be managed at a time. |
| 5158 | */ |
| 5159 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) |
| 5160 | { |
| 5161 | int rv = 0; |
| 5162 | int cnt = 0; |
| 5163 | int state = 0; |
| 5164 | |
| 5165 | /* calculate expected state,ignoring low bits */ |
| 5166 | if (mddev->bitmap && mddev->bitmap_offset) |
| 5167 | state |= (1 << MD_SB_BITMAP_PRESENT); |
| 5168 | |
| 5169 | if (mddev->major_version != info->major_version || |
| 5170 | mddev->minor_version != info->minor_version || |
| 5171 | /* mddev->patch_version != info->patch_version || */ |
| 5172 | mddev->ctime != info->ctime || |
| 5173 | mddev->level != info->level || |
| 5174 | /* mddev->layout != info->layout || */ |
| 5175 | !mddev->persistent != info->not_persistent|| |
| 5176 | mddev->chunk_size != info->chunk_size || |
| 5177 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
| 5178 | ((state^info->state) & 0xfffffe00) |
| 5179 | ) |
| 5180 | return -EINVAL; |
| 5181 | /* Check there is only one change */ |
| 5182 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
| 5183 | cnt++; |
| 5184 | if (mddev->raid_disks != info->raid_disks) |
| 5185 | cnt++; |
| 5186 | if (mddev->layout != info->layout) |
| 5187 | cnt++; |
| 5188 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) |
| 5189 | cnt++; |
| 5190 | if (cnt == 0) |
| 5191 | return 0; |
| 5192 | if (cnt > 1) |
| 5193 | return -EINVAL; |
| 5194 | |
| 5195 | if (mddev->layout != info->layout) { |
| 5196 | /* Change layout |
| 5197 | * we don't need to do anything at the md level, the |
| 5198 | * personality will take care of it all. |
| 5199 | */ |
| 5200 | if (mddev->pers->reconfig == NULL) |
| 5201 | return -EINVAL; |
| 5202 | else |
| 5203 | return mddev->pers->reconfig(mddev, info->layout, -1); |
| 5204 | } |
| 5205 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
| 5206 | rv = update_size(mddev, (sector_t)info->size * 2); |
| 5207 | |
| 5208 | if (mddev->raid_disks != info->raid_disks) |
| 5209 | rv = update_raid_disks(mddev, info->raid_disks); |
| 5210 | |
| 5211 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
| 5212 | if (mddev->pers->quiesce == NULL) |
| 5213 | return -EINVAL; |
| 5214 | if (mddev->recovery || mddev->sync_thread) |
| 5215 | return -EBUSY; |
| 5216 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { |
| 5217 | /* add the bitmap */ |
| 5218 | if (mddev->bitmap) |
| 5219 | return -EEXIST; |
| 5220 | if (mddev->default_bitmap_offset == 0) |
| 5221 | return -EINVAL; |
| 5222 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
| 5223 | mddev->pers->quiesce(mddev, 1); |
| 5224 | rv = bitmap_create(mddev); |
| 5225 | if (rv) |
| 5226 | bitmap_destroy(mddev); |
| 5227 | mddev->pers->quiesce(mddev, 0); |
| 5228 | } else { |
| 5229 | /* remove the bitmap */ |
| 5230 | if (!mddev->bitmap) |
| 5231 | return -ENOENT; |
| 5232 | if (mddev->bitmap->file) |
| 5233 | return -EINVAL; |
| 5234 | mddev->pers->quiesce(mddev, 1); |
| 5235 | bitmap_destroy(mddev); |
| 5236 | mddev->pers->quiesce(mddev, 0); |
| 5237 | mddev->bitmap_offset = 0; |
| 5238 | } |
| 5239 | } |
| 5240 | md_update_sb(mddev, 1); |
| 5241 | return rv; |
| 5242 | } |
| 5243 | |
| 5244 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) |
| 5245 | { |
| 5246 | mdk_rdev_t *rdev; |
| 5247 | |
| 5248 | if (mddev->pers == NULL) |
| 5249 | return -ENODEV; |
| 5250 | |
| 5251 | rdev = find_rdev(mddev, dev); |
| 5252 | if (!rdev) |
| 5253 | return -ENODEV; |
| 5254 | |
| 5255 | md_error(mddev, rdev); |
| 5256 | return 0; |
| 5257 | } |
| 5258 | |
| 5259 | /* |
| 5260 | * We have a problem here : there is no easy way to give a CHS |
| 5261 | * virtual geometry. We currently pretend that we have a 2 heads |
| 5262 | * 4 sectors (with a BIG number of cylinders...). This drives |
| 5263 | * dosfs just mad... ;-) |
| 5264 | */ |
| 5265 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
| 5266 | { |
| 5267 | mddev_t *mddev = bdev->bd_disk->private_data; |
| 5268 | |
| 5269 | geo->heads = 2; |
| 5270 | geo->sectors = 4; |
| 5271 | geo->cylinders = get_capacity(mddev->gendisk) / 8; |
| 5272 | return 0; |
| 5273 | } |
| 5274 | |
| 5275 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
| 5276 | unsigned int cmd, unsigned long arg) |
| 5277 | { |
| 5278 | int err = 0; |
| 5279 | void __user *argp = (void __user *)arg; |
| 5280 | mddev_t *mddev = NULL; |
| 5281 | |
| 5282 | if (!capable(CAP_SYS_ADMIN)) |
| 5283 | return -EACCES; |
| 5284 | |
| 5285 | /* |
| 5286 | * Commands dealing with the RAID driver but not any |
| 5287 | * particular array: |
| 5288 | */ |
| 5289 | switch (cmd) |
| 5290 | { |
| 5291 | case RAID_VERSION: |
| 5292 | err = get_version(argp); |
| 5293 | goto done; |
| 5294 | |
| 5295 | case PRINT_RAID_DEBUG: |
| 5296 | err = 0; |
| 5297 | md_print_devices(); |
| 5298 | goto done; |
| 5299 | |
| 5300 | #ifndef MODULE |
| 5301 | case RAID_AUTORUN: |
| 5302 | err = 0; |
| 5303 | autostart_arrays(arg); |
| 5304 | goto done; |
| 5305 | #endif |
| 5306 | default:; |
| 5307 | } |
| 5308 | |
| 5309 | /* |
| 5310 | * Commands creating/starting a new array: |
| 5311 | */ |
| 5312 | |
| 5313 | mddev = bdev->bd_disk->private_data; |
| 5314 | |
| 5315 | if (!mddev) { |
| 5316 | BUG(); |
| 5317 | goto abort; |
| 5318 | } |
| 5319 | |
| 5320 | err = mddev_lock(mddev); |
| 5321 | if (err) { |
| 5322 | printk(KERN_INFO |
| 5323 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
| 5324 | err, cmd); |
| 5325 | goto abort; |
| 5326 | } |
| 5327 | |
| 5328 | switch (cmd) |
| 5329 | { |
| 5330 | case SET_ARRAY_INFO: |
| 5331 | { |
| 5332 | mdu_array_info_t info; |
| 5333 | if (!arg) |
| 5334 | memset(&info, 0, sizeof(info)); |
| 5335 | else if (copy_from_user(&info, argp, sizeof(info))) { |
| 5336 | err = -EFAULT; |
| 5337 | goto abort_unlock; |
| 5338 | } |
| 5339 | if (mddev->pers) { |
| 5340 | err = update_array_info(mddev, &info); |
| 5341 | if (err) { |
| 5342 | printk(KERN_WARNING "md: couldn't update" |
| 5343 | " array info. %d\n", err); |
| 5344 | goto abort_unlock; |
| 5345 | } |
| 5346 | goto done_unlock; |
| 5347 | } |
| 5348 | if (!list_empty(&mddev->disks)) { |
| 5349 | printk(KERN_WARNING |
| 5350 | "md: array %s already has disks!\n", |
| 5351 | mdname(mddev)); |
| 5352 | err = -EBUSY; |
| 5353 | goto abort_unlock; |
| 5354 | } |
| 5355 | if (mddev->raid_disks) { |
| 5356 | printk(KERN_WARNING |
| 5357 | "md: array %s already initialised!\n", |
| 5358 | mdname(mddev)); |
| 5359 | err = -EBUSY; |
| 5360 | goto abort_unlock; |
| 5361 | } |
| 5362 | err = set_array_info(mddev, &info); |
| 5363 | if (err) { |
| 5364 | printk(KERN_WARNING "md: couldn't set" |
| 5365 | " array info. %d\n", err); |
| 5366 | goto abort_unlock; |
| 5367 | } |
| 5368 | } |
| 5369 | goto done_unlock; |
| 5370 | |
| 5371 | default:; |
| 5372 | } |
| 5373 | |
| 5374 | /* |
| 5375 | * Commands querying/configuring an existing array: |
| 5376 | */ |
| 5377 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
| 5378 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
| 5379 | if ((!mddev->raid_disks && !mddev->external) |
| 5380 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY |
| 5381 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE |
| 5382 | && cmd != GET_BITMAP_FILE) { |
| 5383 | err = -ENODEV; |
| 5384 | goto abort_unlock; |
| 5385 | } |
| 5386 | |
| 5387 | /* |
| 5388 | * Commands even a read-only array can execute: |
| 5389 | */ |
| 5390 | switch (cmd) |
| 5391 | { |
| 5392 | case GET_ARRAY_INFO: |
| 5393 | err = get_array_info(mddev, argp); |
| 5394 | goto done_unlock; |
| 5395 | |
| 5396 | case GET_BITMAP_FILE: |
| 5397 | err = get_bitmap_file(mddev, argp); |
| 5398 | goto done_unlock; |
| 5399 | |
| 5400 | case GET_DISK_INFO: |
| 5401 | err = get_disk_info(mddev, argp); |
| 5402 | goto done_unlock; |
| 5403 | |
| 5404 | case RESTART_ARRAY_RW: |
| 5405 | err = restart_array(mddev); |
| 5406 | goto done_unlock; |
| 5407 | |
| 5408 | case STOP_ARRAY: |
| 5409 | err = do_md_stop(mddev, 0, 1); |
| 5410 | goto done_unlock; |
| 5411 | |
| 5412 | case STOP_ARRAY_RO: |
| 5413 | err = do_md_stop(mddev, 1, 1); |
| 5414 | goto done_unlock; |
| 5415 | |
| 5416 | } |
| 5417 | |
| 5418 | /* |
| 5419 | * The remaining ioctls are changing the state of the |
| 5420 | * superblock, so we do not allow them on read-only arrays. |
| 5421 | * However non-MD ioctls (e.g. get-size) will still come through |
| 5422 | * here and hit the 'default' below, so only disallow |
| 5423 | * 'md' ioctls, and switch to rw mode if started auto-readonly. |
| 5424 | */ |
| 5425 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
| 5426 | if (mddev->ro == 2) { |
| 5427 | mddev->ro = 0; |
| 5428 | sysfs_notify_dirent(mddev->sysfs_state); |
| 5429 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 5430 | md_wakeup_thread(mddev->thread); |
| 5431 | } else { |
| 5432 | err = -EROFS; |
| 5433 | goto abort_unlock; |
| 5434 | } |
| 5435 | } |
| 5436 | |
| 5437 | switch (cmd) |
| 5438 | { |
| 5439 | case ADD_NEW_DISK: |
| 5440 | { |
| 5441 | mdu_disk_info_t info; |
| 5442 | if (copy_from_user(&info, argp, sizeof(info))) |
| 5443 | err = -EFAULT; |
| 5444 | else |
| 5445 | err = add_new_disk(mddev, &info); |
| 5446 | goto done_unlock; |
| 5447 | } |
| 5448 | |
| 5449 | case HOT_REMOVE_DISK: |
| 5450 | err = hot_remove_disk(mddev, new_decode_dev(arg)); |
| 5451 | goto done_unlock; |
| 5452 | |
| 5453 | case HOT_ADD_DISK: |
| 5454 | err = hot_add_disk(mddev, new_decode_dev(arg)); |
| 5455 | goto done_unlock; |
| 5456 | |
| 5457 | case SET_DISK_FAULTY: |
| 5458 | err = set_disk_faulty(mddev, new_decode_dev(arg)); |
| 5459 | goto done_unlock; |
| 5460 | |
| 5461 | case RUN_ARRAY: |
| 5462 | err = do_md_run(mddev); |
| 5463 | goto done_unlock; |
| 5464 | |
| 5465 | case SET_BITMAP_FILE: |
| 5466 | err = set_bitmap_file(mddev, (int)arg); |
| 5467 | goto done_unlock; |
| 5468 | |
| 5469 | default: |
| 5470 | err = -EINVAL; |
| 5471 | goto abort_unlock; |
| 5472 | } |
| 5473 | |
| 5474 | done_unlock: |
| 5475 | abort_unlock: |
| 5476 | if (mddev->hold_active == UNTIL_IOCTL && |
| 5477 | err != -EINVAL) |
| 5478 | mddev->hold_active = 0; |
| 5479 | mddev_unlock(mddev); |
| 5480 | |
| 5481 | return err; |
| 5482 | done: |
| 5483 | if (err) |
| 5484 | MD_BUG(); |
| 5485 | abort: |
| 5486 | return err; |
| 5487 | } |
| 5488 | |
| 5489 | static int md_open(struct block_device *bdev, fmode_t mode) |
| 5490 | { |
| 5491 | /* |
| 5492 | * Succeed if we can lock the mddev, which confirms that |
| 5493 | * it isn't being stopped right now. |
| 5494 | */ |
| 5495 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
| 5496 | int err; |
| 5497 | |
| 5498 | if (mddev->gendisk != bdev->bd_disk) { |
| 5499 | /* we are racing with mddev_put which is discarding this |
| 5500 | * bd_disk. |
| 5501 | */ |
| 5502 | mddev_put(mddev); |
| 5503 | /* Wait until bdev->bd_disk is definitely gone */ |
| 5504 | flush_scheduled_work(); |
| 5505 | /* Then retry the open from the top */ |
| 5506 | return -ERESTARTSYS; |
| 5507 | } |
| 5508 | BUG_ON(mddev != bdev->bd_disk->private_data); |
| 5509 | |
| 5510 | if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1))) |
| 5511 | goto out; |
| 5512 | |
| 5513 | err = 0; |
| 5514 | atomic_inc(&mddev->openers); |
| 5515 | mddev_unlock(mddev); |
| 5516 | |
| 5517 | check_disk_change(bdev); |
| 5518 | out: |
| 5519 | return err; |
| 5520 | } |
| 5521 | |
| 5522 | static int md_release(struct gendisk *disk, fmode_t mode) |
| 5523 | { |
| 5524 | mddev_t *mddev = disk->private_data; |
| 5525 | |
| 5526 | BUG_ON(!mddev); |
| 5527 | atomic_dec(&mddev->openers); |
| 5528 | mddev_put(mddev); |
| 5529 | |
| 5530 | return 0; |
| 5531 | } |
| 5532 | |
| 5533 | static int md_media_changed(struct gendisk *disk) |
| 5534 | { |
| 5535 | mddev_t *mddev = disk->private_data; |
| 5536 | |
| 5537 | return mddev->changed; |
| 5538 | } |
| 5539 | |
| 5540 | static int md_revalidate(struct gendisk *disk) |
| 5541 | { |
| 5542 | mddev_t *mddev = disk->private_data; |
| 5543 | |
| 5544 | mddev->changed = 0; |
| 5545 | return 0; |
| 5546 | } |
| 5547 | static struct block_device_operations md_fops = |
| 5548 | { |
| 5549 | .owner = THIS_MODULE, |
| 5550 | .open = md_open, |
| 5551 | .release = md_release, |
| 5552 | .locked_ioctl = md_ioctl, |
| 5553 | .getgeo = md_getgeo, |
| 5554 | .media_changed = md_media_changed, |
| 5555 | .revalidate_disk= md_revalidate, |
| 5556 | }; |
| 5557 | |
| 5558 | static int md_thread(void * arg) |
| 5559 | { |
| 5560 | mdk_thread_t *thread = arg; |
| 5561 | |
| 5562 | /* |
| 5563 | * md_thread is a 'system-thread', it's priority should be very |
| 5564 | * high. We avoid resource deadlocks individually in each |
| 5565 | * raid personality. (RAID5 does preallocation) We also use RR and |
| 5566 | * the very same RT priority as kswapd, thus we will never get |
| 5567 | * into a priority inversion deadlock. |
| 5568 | * |
| 5569 | * we definitely have to have equal or higher priority than |
| 5570 | * bdflush, otherwise bdflush will deadlock if there are too |
| 5571 | * many dirty RAID5 blocks. |
| 5572 | */ |
| 5573 | |
| 5574 | allow_signal(SIGKILL); |
| 5575 | while (!kthread_should_stop()) { |
| 5576 | |
| 5577 | /* We need to wait INTERRUPTIBLE so that |
| 5578 | * we don't add to the load-average. |
| 5579 | * That means we need to be sure no signals are |
| 5580 | * pending |
| 5581 | */ |
| 5582 | if (signal_pending(current)) |
| 5583 | flush_signals(current); |
| 5584 | |
| 5585 | wait_event_interruptible_timeout |
| 5586 | (thread->wqueue, |
| 5587 | test_bit(THREAD_WAKEUP, &thread->flags) |
| 5588 | || kthread_should_stop(), |
| 5589 | thread->timeout); |
| 5590 | |
| 5591 | clear_bit(THREAD_WAKEUP, &thread->flags); |
| 5592 | |
| 5593 | thread->run(thread->mddev); |
| 5594 | } |
| 5595 | |
| 5596 | return 0; |
| 5597 | } |
| 5598 | |
| 5599 | void md_wakeup_thread(mdk_thread_t *thread) |
| 5600 | { |
| 5601 | if (thread) { |
| 5602 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); |
| 5603 | set_bit(THREAD_WAKEUP, &thread->flags); |
| 5604 | wake_up(&thread->wqueue); |
| 5605 | } |
| 5606 | } |
| 5607 | |
| 5608 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, |
| 5609 | const char *name) |
| 5610 | { |
| 5611 | mdk_thread_t *thread; |
| 5612 | |
| 5613 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
| 5614 | if (!thread) |
| 5615 | return NULL; |
| 5616 | |
| 5617 | init_waitqueue_head(&thread->wqueue); |
| 5618 | |
| 5619 | thread->run = run; |
| 5620 | thread->mddev = mddev; |
| 5621 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
| 5622 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
| 5623 | if (IS_ERR(thread->tsk)) { |
| 5624 | kfree(thread); |
| 5625 | return NULL; |
| 5626 | } |
| 5627 | return thread; |
| 5628 | } |
| 5629 | |
| 5630 | void md_unregister_thread(mdk_thread_t *thread) |
| 5631 | { |
| 5632 | if (!thread) |
| 5633 | return; |
| 5634 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
| 5635 | |
| 5636 | kthread_stop(thread->tsk); |
| 5637 | kfree(thread); |
| 5638 | } |
| 5639 | |
| 5640 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) |
| 5641 | { |
| 5642 | if (!mddev) { |
| 5643 | MD_BUG(); |
| 5644 | return; |
| 5645 | } |
| 5646 | |
| 5647 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
| 5648 | return; |
| 5649 | |
| 5650 | if (mddev->external) |
| 5651 | set_bit(Blocked, &rdev->flags); |
| 5652 | /* |
| 5653 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
| 5654 | mdname(mddev), |
| 5655 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), |
| 5656 | __builtin_return_address(0),__builtin_return_address(1), |
| 5657 | __builtin_return_address(2),__builtin_return_address(3)); |
| 5658 | */ |
| 5659 | if (!mddev->pers) |
| 5660 | return; |
| 5661 | if (!mddev->pers->error_handler) |
| 5662 | return; |
| 5663 | mddev->pers->error_handler(mddev,rdev); |
| 5664 | if (mddev->degraded) |
| 5665 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 5666 | set_bit(StateChanged, &rdev->flags); |
| 5667 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 5668 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 5669 | md_wakeup_thread(mddev->thread); |
| 5670 | md_new_event_inintr(mddev); |
| 5671 | } |
| 5672 | |
| 5673 | /* seq_file implementation /proc/mdstat */ |
| 5674 | |
| 5675 | static void status_unused(struct seq_file *seq) |
| 5676 | { |
| 5677 | int i = 0; |
| 5678 | mdk_rdev_t *rdev; |
| 5679 | |
| 5680 | seq_printf(seq, "unused devices: "); |
| 5681 | |
| 5682 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
| 5683 | char b[BDEVNAME_SIZE]; |
| 5684 | i++; |
| 5685 | seq_printf(seq, "%s ", |
| 5686 | bdevname(rdev->bdev,b)); |
| 5687 | } |
| 5688 | if (!i) |
| 5689 | seq_printf(seq, "<none>"); |
| 5690 | |
| 5691 | seq_printf(seq, "\n"); |
| 5692 | } |
| 5693 | |
| 5694 | |
| 5695 | static void status_resync(struct seq_file *seq, mddev_t * mddev) |
| 5696 | { |
| 5697 | sector_t max_blocks, resync, res; |
| 5698 | unsigned long dt, db, rt; |
| 5699 | int scale; |
| 5700 | unsigned int per_milli; |
| 5701 | |
| 5702 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; |
| 5703 | |
| 5704 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
| 5705 | max_blocks = mddev->resync_max_sectors >> 1; |
| 5706 | else |
| 5707 | max_blocks = mddev->dev_sectors / 2; |
| 5708 | |
| 5709 | /* |
| 5710 | * Should not happen. |
| 5711 | */ |
| 5712 | if (!max_blocks) { |
| 5713 | MD_BUG(); |
| 5714 | return; |
| 5715 | } |
| 5716 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
| 5717 | * in a sector_t, and (max_blocks>>scale) will fit in a |
| 5718 | * u32, as those are the requirements for sector_div. |
| 5719 | * Thus 'scale' must be at least 10 |
| 5720 | */ |
| 5721 | scale = 10; |
| 5722 | if (sizeof(sector_t) > sizeof(unsigned long)) { |
| 5723 | while ( max_blocks/2 > (1ULL<<(scale+32))) |
| 5724 | scale++; |
| 5725 | } |
| 5726 | res = (resync>>scale)*1000; |
| 5727 | sector_div(res, (u32)((max_blocks>>scale)+1)); |
| 5728 | |
| 5729 | per_milli = res; |
| 5730 | { |
| 5731 | int i, x = per_milli/50, y = 20-x; |
| 5732 | seq_printf(seq, "["); |
| 5733 | for (i = 0; i < x; i++) |
| 5734 | seq_printf(seq, "="); |
| 5735 | seq_printf(seq, ">"); |
| 5736 | for (i = 0; i < y; i++) |
| 5737 | seq_printf(seq, "."); |
| 5738 | seq_printf(seq, "] "); |
| 5739 | } |
| 5740 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
| 5741 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
| 5742 | "reshape" : |
| 5743 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
| 5744 | "check" : |
| 5745 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? |
| 5746 | "resync" : "recovery"))), |
| 5747 | per_milli/10, per_milli % 10, |
| 5748 | (unsigned long long) resync, |
| 5749 | (unsigned long long) max_blocks); |
| 5750 | |
| 5751 | /* |
| 5752 | * We do not want to overflow, so the order of operands and |
| 5753 | * the * 100 / 100 trick are important. We do a +1 to be |
| 5754 | * safe against division by zero. We only estimate anyway. |
| 5755 | * |
| 5756 | * dt: time from mark until now |
| 5757 | * db: blocks written from mark until now |
| 5758 | * rt: remaining time |
| 5759 | */ |
| 5760 | dt = ((jiffies - mddev->resync_mark) / HZ); |
| 5761 | if (!dt) dt++; |
| 5762 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
| 5763 | - mddev->resync_mark_cnt; |
| 5764 | rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100; |
| 5765 | |
| 5766 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); |
| 5767 | |
| 5768 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
| 5769 | } |
| 5770 | |
| 5771 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) |
| 5772 | { |
| 5773 | struct list_head *tmp; |
| 5774 | loff_t l = *pos; |
| 5775 | mddev_t *mddev; |
| 5776 | |
| 5777 | if (l >= 0x10000) |
| 5778 | return NULL; |
| 5779 | if (!l--) |
| 5780 | /* header */ |
| 5781 | return (void*)1; |
| 5782 | |
| 5783 | spin_lock(&all_mddevs_lock); |
| 5784 | list_for_each(tmp,&all_mddevs) |
| 5785 | if (!l--) { |
| 5786 | mddev = list_entry(tmp, mddev_t, all_mddevs); |
| 5787 | mddev_get(mddev); |
| 5788 | spin_unlock(&all_mddevs_lock); |
| 5789 | return mddev; |
| 5790 | } |
| 5791 | spin_unlock(&all_mddevs_lock); |
| 5792 | if (!l--) |
| 5793 | return (void*)2;/* tail */ |
| 5794 | return NULL; |
| 5795 | } |
| 5796 | |
| 5797 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 5798 | { |
| 5799 | struct list_head *tmp; |
| 5800 | mddev_t *next_mddev, *mddev = v; |
| 5801 | |
| 5802 | ++*pos; |
| 5803 | if (v == (void*)2) |
| 5804 | return NULL; |
| 5805 | |
| 5806 | spin_lock(&all_mddevs_lock); |
| 5807 | if (v == (void*)1) |
| 5808 | tmp = all_mddevs.next; |
| 5809 | else |
| 5810 | tmp = mddev->all_mddevs.next; |
| 5811 | if (tmp != &all_mddevs) |
| 5812 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); |
| 5813 | else { |
| 5814 | next_mddev = (void*)2; |
| 5815 | *pos = 0x10000; |
| 5816 | } |
| 5817 | spin_unlock(&all_mddevs_lock); |
| 5818 | |
| 5819 | if (v != (void*)1) |
| 5820 | mddev_put(mddev); |
| 5821 | return next_mddev; |
| 5822 | |
| 5823 | } |
| 5824 | |
| 5825 | static void md_seq_stop(struct seq_file *seq, void *v) |
| 5826 | { |
| 5827 | mddev_t *mddev = v; |
| 5828 | |
| 5829 | if (mddev && v != (void*)1 && v != (void*)2) |
| 5830 | mddev_put(mddev); |
| 5831 | } |
| 5832 | |
| 5833 | struct mdstat_info { |
| 5834 | int event; |
| 5835 | }; |
| 5836 | |
| 5837 | static int md_seq_show(struct seq_file *seq, void *v) |
| 5838 | { |
| 5839 | mddev_t *mddev = v; |
| 5840 | sector_t sectors; |
| 5841 | mdk_rdev_t *rdev; |
| 5842 | struct mdstat_info *mi = seq->private; |
| 5843 | struct bitmap *bitmap; |
| 5844 | |
| 5845 | if (v == (void*)1) { |
| 5846 | struct mdk_personality *pers; |
| 5847 | seq_printf(seq, "Personalities : "); |
| 5848 | spin_lock(&pers_lock); |
| 5849 | list_for_each_entry(pers, &pers_list, list) |
| 5850 | seq_printf(seq, "[%s] ", pers->name); |
| 5851 | |
| 5852 | spin_unlock(&pers_lock); |
| 5853 | seq_printf(seq, "\n"); |
| 5854 | mi->event = atomic_read(&md_event_count); |
| 5855 | return 0; |
| 5856 | } |
| 5857 | if (v == (void*)2) { |
| 5858 | status_unused(seq); |
| 5859 | return 0; |
| 5860 | } |
| 5861 | |
| 5862 | if (mddev_lock(mddev) < 0) |
| 5863 | return -EINTR; |
| 5864 | |
| 5865 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
| 5866 | seq_printf(seq, "%s : %sactive", mdname(mddev), |
| 5867 | mddev->pers ? "" : "in"); |
| 5868 | if (mddev->pers) { |
| 5869 | if (mddev->ro==1) |
| 5870 | seq_printf(seq, " (read-only)"); |
| 5871 | if (mddev->ro==2) |
| 5872 | seq_printf(seq, " (auto-read-only)"); |
| 5873 | seq_printf(seq, " %s", mddev->pers->name); |
| 5874 | } |
| 5875 | |
| 5876 | sectors = 0; |
| 5877 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 5878 | char b[BDEVNAME_SIZE]; |
| 5879 | seq_printf(seq, " %s[%d]", |
| 5880 | bdevname(rdev->bdev,b), rdev->desc_nr); |
| 5881 | if (test_bit(WriteMostly, &rdev->flags)) |
| 5882 | seq_printf(seq, "(W)"); |
| 5883 | if (test_bit(Faulty, &rdev->flags)) { |
| 5884 | seq_printf(seq, "(F)"); |
| 5885 | continue; |
| 5886 | } else if (rdev->raid_disk < 0) |
| 5887 | seq_printf(seq, "(S)"); /* spare */ |
| 5888 | sectors += rdev->sectors; |
| 5889 | } |
| 5890 | |
| 5891 | if (!list_empty(&mddev->disks)) { |
| 5892 | if (mddev->pers) |
| 5893 | seq_printf(seq, "\n %llu blocks", |
| 5894 | (unsigned long long) |
| 5895 | mddev->array_sectors / 2); |
| 5896 | else |
| 5897 | seq_printf(seq, "\n %llu blocks", |
| 5898 | (unsigned long long)sectors / 2); |
| 5899 | } |
| 5900 | if (mddev->persistent) { |
| 5901 | if (mddev->major_version != 0 || |
| 5902 | mddev->minor_version != 90) { |
| 5903 | seq_printf(seq," super %d.%d", |
| 5904 | mddev->major_version, |
| 5905 | mddev->minor_version); |
| 5906 | } |
| 5907 | } else if (mddev->external) |
| 5908 | seq_printf(seq, " super external:%s", |
| 5909 | mddev->metadata_type); |
| 5910 | else |
| 5911 | seq_printf(seq, " super non-persistent"); |
| 5912 | |
| 5913 | if (mddev->pers) { |
| 5914 | mddev->pers->status(seq, mddev); |
| 5915 | seq_printf(seq, "\n "); |
| 5916 | if (mddev->pers->sync_request) { |
| 5917 | if (mddev->curr_resync > 2) { |
| 5918 | status_resync(seq, mddev); |
| 5919 | seq_printf(seq, "\n "); |
| 5920 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) |
| 5921 | seq_printf(seq, "\tresync=DELAYED\n "); |
| 5922 | else if (mddev->recovery_cp < MaxSector) |
| 5923 | seq_printf(seq, "\tresync=PENDING\n "); |
| 5924 | } |
| 5925 | } else |
| 5926 | seq_printf(seq, "\n "); |
| 5927 | |
| 5928 | if ((bitmap = mddev->bitmap)) { |
| 5929 | unsigned long chunk_kb; |
| 5930 | unsigned long flags; |
| 5931 | spin_lock_irqsave(&bitmap->lock, flags); |
| 5932 | chunk_kb = bitmap->chunksize >> 10; |
| 5933 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
| 5934 | "%lu%s chunk", |
| 5935 | bitmap->pages - bitmap->missing_pages, |
| 5936 | bitmap->pages, |
| 5937 | (bitmap->pages - bitmap->missing_pages) |
| 5938 | << (PAGE_SHIFT - 10), |
| 5939 | chunk_kb ? chunk_kb : bitmap->chunksize, |
| 5940 | chunk_kb ? "KB" : "B"); |
| 5941 | if (bitmap->file) { |
| 5942 | seq_printf(seq, ", file: "); |
| 5943 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
| 5944 | } |
| 5945 | |
| 5946 | seq_printf(seq, "\n"); |
| 5947 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 5948 | } |
| 5949 | |
| 5950 | seq_printf(seq, "\n"); |
| 5951 | } |
| 5952 | mddev_unlock(mddev); |
| 5953 | |
| 5954 | return 0; |
| 5955 | } |
| 5956 | |
| 5957 | static struct seq_operations md_seq_ops = { |
| 5958 | .start = md_seq_start, |
| 5959 | .next = md_seq_next, |
| 5960 | .stop = md_seq_stop, |
| 5961 | .show = md_seq_show, |
| 5962 | }; |
| 5963 | |
| 5964 | static int md_seq_open(struct inode *inode, struct file *file) |
| 5965 | { |
| 5966 | int error; |
| 5967 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
| 5968 | if (mi == NULL) |
| 5969 | return -ENOMEM; |
| 5970 | |
| 5971 | error = seq_open(file, &md_seq_ops); |
| 5972 | if (error) |
| 5973 | kfree(mi); |
| 5974 | else { |
| 5975 | struct seq_file *p = file->private_data; |
| 5976 | p->private = mi; |
| 5977 | mi->event = atomic_read(&md_event_count); |
| 5978 | } |
| 5979 | return error; |
| 5980 | } |
| 5981 | |
| 5982 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
| 5983 | { |
| 5984 | struct seq_file *m = filp->private_data; |
| 5985 | struct mdstat_info *mi = m->private; |
| 5986 | int mask; |
| 5987 | |
| 5988 | poll_wait(filp, &md_event_waiters, wait); |
| 5989 | |
| 5990 | /* always allow read */ |
| 5991 | mask = POLLIN | POLLRDNORM; |
| 5992 | |
| 5993 | if (mi->event != atomic_read(&md_event_count)) |
| 5994 | mask |= POLLERR | POLLPRI; |
| 5995 | return mask; |
| 5996 | } |
| 5997 | |
| 5998 | static const struct file_operations md_seq_fops = { |
| 5999 | .owner = THIS_MODULE, |
| 6000 | .open = md_seq_open, |
| 6001 | .read = seq_read, |
| 6002 | .llseek = seq_lseek, |
| 6003 | .release = seq_release_private, |
| 6004 | .poll = mdstat_poll, |
| 6005 | }; |
| 6006 | |
| 6007 | int register_md_personality(struct mdk_personality *p) |
| 6008 | { |
| 6009 | spin_lock(&pers_lock); |
| 6010 | list_add_tail(&p->list, &pers_list); |
| 6011 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); |
| 6012 | spin_unlock(&pers_lock); |
| 6013 | return 0; |
| 6014 | } |
| 6015 | |
| 6016 | int unregister_md_personality(struct mdk_personality *p) |
| 6017 | { |
| 6018 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
| 6019 | spin_lock(&pers_lock); |
| 6020 | list_del_init(&p->list); |
| 6021 | spin_unlock(&pers_lock); |
| 6022 | return 0; |
| 6023 | } |
| 6024 | |
| 6025 | static int is_mddev_idle(mddev_t *mddev, int init) |
| 6026 | { |
| 6027 | mdk_rdev_t * rdev; |
| 6028 | int idle; |
| 6029 | int curr_events; |
| 6030 | |
| 6031 | idle = 1; |
| 6032 | rcu_read_lock(); |
| 6033 | rdev_for_each_rcu(rdev, mddev) { |
| 6034 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
| 6035 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
| 6036 | (int)part_stat_read(&disk->part0, sectors[1]) - |
| 6037 | atomic_read(&disk->sync_io); |
| 6038 | /* sync IO will cause sync_io to increase before the disk_stats |
| 6039 | * as sync_io is counted when a request starts, and |
| 6040 | * disk_stats is counted when it completes. |
| 6041 | * So resync activity will cause curr_events to be smaller than |
| 6042 | * when there was no such activity. |
| 6043 | * non-sync IO will cause disk_stat to increase without |
| 6044 | * increasing sync_io so curr_events will (eventually) |
| 6045 | * be larger than it was before. Once it becomes |
| 6046 | * substantially larger, the test below will cause |
| 6047 | * the array to appear non-idle, and resync will slow |
| 6048 | * down. |
| 6049 | * If there is a lot of outstanding resync activity when |
| 6050 | * we set last_event to curr_events, then all that activity |
| 6051 | * completing might cause the array to appear non-idle |
| 6052 | * and resync will be slowed down even though there might |
| 6053 | * not have been non-resync activity. This will only |
| 6054 | * happen once though. 'last_events' will soon reflect |
| 6055 | * the state where there is little or no outstanding |
| 6056 | * resync requests, and further resync activity will |
| 6057 | * always make curr_events less than last_events. |
| 6058 | * |
| 6059 | */ |
| 6060 | if (init || curr_events - rdev->last_events > 64) { |
| 6061 | rdev->last_events = curr_events; |
| 6062 | idle = 0; |
| 6063 | } |
| 6064 | } |
| 6065 | rcu_read_unlock(); |
| 6066 | return idle; |
| 6067 | } |
| 6068 | |
| 6069 | void md_done_sync(mddev_t *mddev, int blocks, int ok) |
| 6070 | { |
| 6071 | /* another "blocks" (512byte) blocks have been synced */ |
| 6072 | atomic_sub(blocks, &mddev->recovery_active); |
| 6073 | wake_up(&mddev->recovery_wait); |
| 6074 | if (!ok) { |
| 6075 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 6076 | md_wakeup_thread(mddev->thread); |
| 6077 | // stop recovery, signal do_sync .... |
| 6078 | } |
| 6079 | } |
| 6080 | |
| 6081 | |
| 6082 | /* md_write_start(mddev, bi) |
| 6083 | * If we need to update some array metadata (e.g. 'active' flag |
| 6084 | * in superblock) before writing, schedule a superblock update |
| 6085 | * and wait for it to complete. |
| 6086 | */ |
| 6087 | void md_write_start(mddev_t *mddev, struct bio *bi) |
| 6088 | { |
| 6089 | int did_change = 0; |
| 6090 | if (bio_data_dir(bi) != WRITE) |
| 6091 | return; |
| 6092 | |
| 6093 | BUG_ON(mddev->ro == 1); |
| 6094 | if (mddev->ro == 2) { |
| 6095 | /* need to switch to read/write */ |
| 6096 | mddev->ro = 0; |
| 6097 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 6098 | md_wakeup_thread(mddev->thread); |
| 6099 | md_wakeup_thread(mddev->sync_thread); |
| 6100 | did_change = 1; |
| 6101 | } |
| 6102 | atomic_inc(&mddev->writes_pending); |
| 6103 | if (mddev->safemode == 1) |
| 6104 | mddev->safemode = 0; |
| 6105 | if (mddev->in_sync) { |
| 6106 | spin_lock_irq(&mddev->write_lock); |
| 6107 | if (mddev->in_sync) { |
| 6108 | mddev->in_sync = 0; |
| 6109 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| 6110 | md_wakeup_thread(mddev->thread); |
| 6111 | did_change = 1; |
| 6112 | } |
| 6113 | spin_unlock_irq(&mddev->write_lock); |
| 6114 | } |
| 6115 | if (did_change) |
| 6116 | sysfs_notify_dirent(mddev->sysfs_state); |
| 6117 | wait_event(mddev->sb_wait, |
| 6118 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && |
| 6119 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
| 6120 | } |
| 6121 | |
| 6122 | void md_write_end(mddev_t *mddev) |
| 6123 | { |
| 6124 | if (atomic_dec_and_test(&mddev->writes_pending)) { |
| 6125 | if (mddev->safemode == 2) |
| 6126 | md_wakeup_thread(mddev->thread); |
| 6127 | else if (mddev->safemode_delay) |
| 6128 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
| 6129 | } |
| 6130 | } |
| 6131 | |
| 6132 | /* md_allow_write(mddev) |
| 6133 | * Calling this ensures that the array is marked 'active' so that writes |
| 6134 | * may proceed without blocking. It is important to call this before |
| 6135 | * attempting a GFP_KERNEL allocation while holding the mddev lock. |
| 6136 | * Must be called with mddev_lock held. |
| 6137 | * |
| 6138 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock |
| 6139 | * is dropped, so return -EAGAIN after notifying userspace. |
| 6140 | */ |
| 6141 | int md_allow_write(mddev_t *mddev) |
| 6142 | { |
| 6143 | if (!mddev->pers) |
| 6144 | return 0; |
| 6145 | if (mddev->ro) |
| 6146 | return 0; |
| 6147 | if (!mddev->pers->sync_request) |
| 6148 | return 0; |
| 6149 | |
| 6150 | spin_lock_irq(&mddev->write_lock); |
| 6151 | if (mddev->in_sync) { |
| 6152 | mddev->in_sync = 0; |
| 6153 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| 6154 | if (mddev->safemode_delay && |
| 6155 | mddev->safemode == 0) |
| 6156 | mddev->safemode = 1; |
| 6157 | spin_unlock_irq(&mddev->write_lock); |
| 6158 | md_update_sb(mddev, 0); |
| 6159 | sysfs_notify_dirent(mddev->sysfs_state); |
| 6160 | } else |
| 6161 | spin_unlock_irq(&mddev->write_lock); |
| 6162 | |
| 6163 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
| 6164 | return -EAGAIN; |
| 6165 | else |
| 6166 | return 0; |
| 6167 | } |
| 6168 | EXPORT_SYMBOL_GPL(md_allow_write); |
| 6169 | |
| 6170 | #define SYNC_MARKS 10 |
| 6171 | #define SYNC_MARK_STEP (3*HZ) |
| 6172 | void md_do_sync(mddev_t *mddev) |
| 6173 | { |
| 6174 | mddev_t *mddev2; |
| 6175 | unsigned int currspeed = 0, |
| 6176 | window; |
| 6177 | sector_t max_sectors,j, io_sectors; |
| 6178 | unsigned long mark[SYNC_MARKS]; |
| 6179 | sector_t mark_cnt[SYNC_MARKS]; |
| 6180 | int last_mark,m; |
| 6181 | struct list_head *tmp; |
| 6182 | sector_t last_check; |
| 6183 | int skipped = 0; |
| 6184 | mdk_rdev_t *rdev; |
| 6185 | char *desc; |
| 6186 | |
| 6187 | /* just incase thread restarts... */ |
| 6188 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) |
| 6189 | return; |
| 6190 | if (mddev->ro) /* never try to sync a read-only array */ |
| 6191 | return; |
| 6192 | |
| 6193 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| 6194 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) |
| 6195 | desc = "data-check"; |
| 6196 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| 6197 | desc = "requested-resync"; |
| 6198 | else |
| 6199 | desc = "resync"; |
| 6200 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 6201 | desc = "reshape"; |
| 6202 | else |
| 6203 | desc = "recovery"; |
| 6204 | |
| 6205 | /* we overload curr_resync somewhat here. |
| 6206 | * 0 == not engaged in resync at all |
| 6207 | * 2 == checking that there is no conflict with another sync |
| 6208 | * 1 == like 2, but have yielded to allow conflicting resync to |
| 6209 | * commense |
| 6210 | * other == active in resync - this many blocks |
| 6211 | * |
| 6212 | * Before starting a resync we must have set curr_resync to |
| 6213 | * 2, and then checked that every "conflicting" array has curr_resync |
| 6214 | * less than ours. When we find one that is the same or higher |
| 6215 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync |
| 6216 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). |
| 6217 | * This will mean we have to start checking from the beginning again. |
| 6218 | * |
| 6219 | */ |
| 6220 | |
| 6221 | do { |
| 6222 | mddev->curr_resync = 2; |
| 6223 | |
| 6224 | try_again: |
| 6225 | if (kthread_should_stop()) { |
| 6226 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 6227 | goto skip; |
| 6228 | } |
| 6229 | for_each_mddev(mddev2, tmp) { |
| 6230 | if (mddev2 == mddev) |
| 6231 | continue; |
| 6232 | if (!mddev->parallel_resync |
| 6233 | && mddev2->curr_resync |
| 6234 | && match_mddev_units(mddev, mddev2)) { |
| 6235 | DEFINE_WAIT(wq); |
| 6236 | if (mddev < mddev2 && mddev->curr_resync == 2) { |
| 6237 | /* arbitrarily yield */ |
| 6238 | mddev->curr_resync = 1; |
| 6239 | wake_up(&resync_wait); |
| 6240 | } |
| 6241 | if (mddev > mddev2 && mddev->curr_resync == 1) |
| 6242 | /* no need to wait here, we can wait the next |
| 6243 | * time 'round when curr_resync == 2 |
| 6244 | */ |
| 6245 | continue; |
| 6246 | /* We need to wait 'interruptible' so as not to |
| 6247 | * contribute to the load average, and not to |
| 6248 | * be caught by 'softlockup' |
| 6249 | */ |
| 6250 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); |
| 6251 | if (!kthread_should_stop() && |
| 6252 | mddev2->curr_resync >= mddev->curr_resync) { |
| 6253 | printk(KERN_INFO "md: delaying %s of %s" |
| 6254 | " until %s has finished (they" |
| 6255 | " share one or more physical units)\n", |
| 6256 | desc, mdname(mddev), mdname(mddev2)); |
| 6257 | mddev_put(mddev2); |
| 6258 | if (signal_pending(current)) |
| 6259 | flush_signals(current); |
| 6260 | schedule(); |
| 6261 | finish_wait(&resync_wait, &wq); |
| 6262 | goto try_again; |
| 6263 | } |
| 6264 | finish_wait(&resync_wait, &wq); |
| 6265 | } |
| 6266 | } |
| 6267 | } while (mddev->curr_resync < 2); |
| 6268 | |
| 6269 | j = 0; |
| 6270 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| 6271 | /* resync follows the size requested by the personality, |
| 6272 | * which defaults to physical size, but can be virtual size |
| 6273 | */ |
| 6274 | max_sectors = mddev->resync_max_sectors; |
| 6275 | mddev->resync_mismatches = 0; |
| 6276 | /* we don't use the checkpoint if there's a bitmap */ |
| 6277 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
| 6278 | j = mddev->resync_min; |
| 6279 | else if (!mddev->bitmap) |
| 6280 | j = mddev->recovery_cp; |
| 6281 | |
| 6282 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
| 6283 | max_sectors = mddev->dev_sectors; |
| 6284 | else { |
| 6285 | /* recovery follows the physical size of devices */ |
| 6286 | max_sectors = mddev->dev_sectors; |
| 6287 | j = MaxSector; |
| 6288 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 6289 | if (rdev->raid_disk >= 0 && |
| 6290 | !test_bit(Faulty, &rdev->flags) && |
| 6291 | !test_bit(In_sync, &rdev->flags) && |
| 6292 | rdev->recovery_offset < j) |
| 6293 | j = rdev->recovery_offset; |
| 6294 | } |
| 6295 | |
| 6296 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
| 6297 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" |
| 6298 | " %d KB/sec/disk.\n", speed_min(mddev)); |
| 6299 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
| 6300 | "(but not more than %d KB/sec) for %s.\n", |
| 6301 | speed_max(mddev), desc); |
| 6302 | |
| 6303 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
| 6304 | |
| 6305 | io_sectors = 0; |
| 6306 | for (m = 0; m < SYNC_MARKS; m++) { |
| 6307 | mark[m] = jiffies; |
| 6308 | mark_cnt[m] = io_sectors; |
| 6309 | } |
| 6310 | last_mark = 0; |
| 6311 | mddev->resync_mark = mark[last_mark]; |
| 6312 | mddev->resync_mark_cnt = mark_cnt[last_mark]; |
| 6313 | |
| 6314 | /* |
| 6315 | * Tune reconstruction: |
| 6316 | */ |
| 6317 | window = 32*(PAGE_SIZE/512); |
| 6318 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", |
| 6319 | window/2,(unsigned long long) max_sectors/2); |
| 6320 | |
| 6321 | atomic_set(&mddev->recovery_active, 0); |
| 6322 | last_check = 0; |
| 6323 | |
| 6324 | if (j>2) { |
| 6325 | printk(KERN_INFO |
| 6326 | "md: resuming %s of %s from checkpoint.\n", |
| 6327 | desc, mdname(mddev)); |
| 6328 | mddev->curr_resync = j; |
| 6329 | } |
| 6330 | |
| 6331 | while (j < max_sectors) { |
| 6332 | sector_t sectors; |
| 6333 | |
| 6334 | skipped = 0; |
| 6335 | if (j >= mddev->resync_max) { |
| 6336 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| 6337 | wait_event(mddev->recovery_wait, |
| 6338 | mddev->resync_max > j |
| 6339 | || kthread_should_stop()); |
| 6340 | } |
| 6341 | if (kthread_should_stop()) |
| 6342 | goto interrupted; |
| 6343 | |
| 6344 | if (mddev->curr_resync > mddev->curr_resync_completed && |
| 6345 | (mddev->curr_resync - mddev->curr_resync_completed) |
| 6346 | > (max_sectors >> 4)) { |
| 6347 | /* time to update curr_resync_completed */ |
| 6348 | blk_unplug(mddev->queue); |
| 6349 | wait_event(mddev->recovery_wait, |
| 6350 | atomic_read(&mddev->recovery_active) == 0); |
| 6351 | mddev->curr_resync_completed = |
| 6352 | mddev->curr_resync; |
| 6353 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| 6354 | } |
| 6355 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
| 6356 | currspeed < speed_min(mddev)); |
| 6357 | if (sectors == 0) { |
| 6358 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 6359 | goto out; |
| 6360 | } |
| 6361 | |
| 6362 | if (!skipped) { /* actual IO requested */ |
| 6363 | io_sectors += sectors; |
| 6364 | atomic_add(sectors, &mddev->recovery_active); |
| 6365 | } |
| 6366 | |
| 6367 | j += sectors; |
| 6368 | if (j>1) mddev->curr_resync = j; |
| 6369 | mddev->curr_mark_cnt = io_sectors; |
| 6370 | if (last_check == 0) |
| 6371 | /* this is the earliers that rebuilt will be |
| 6372 | * visible in /proc/mdstat |
| 6373 | */ |
| 6374 | md_new_event(mddev); |
| 6375 | |
| 6376 | if (last_check + window > io_sectors || j == max_sectors) |
| 6377 | continue; |
| 6378 | |
| 6379 | last_check = io_sectors; |
| 6380 | |
| 6381 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| 6382 | break; |
| 6383 | |
| 6384 | repeat: |
| 6385 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { |
| 6386 | /* step marks */ |
| 6387 | int next = (last_mark+1) % SYNC_MARKS; |
| 6388 | |
| 6389 | mddev->resync_mark = mark[next]; |
| 6390 | mddev->resync_mark_cnt = mark_cnt[next]; |
| 6391 | mark[next] = jiffies; |
| 6392 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
| 6393 | last_mark = next; |
| 6394 | } |
| 6395 | |
| 6396 | |
| 6397 | if (kthread_should_stop()) |
| 6398 | goto interrupted; |
| 6399 | |
| 6400 | |
| 6401 | /* |
| 6402 | * this loop exits only if either when we are slower than |
| 6403 | * the 'hard' speed limit, or the system was IO-idle for |
| 6404 | * a jiffy. |
| 6405 | * the system might be non-idle CPU-wise, but we only care |
| 6406 | * about not overloading the IO subsystem. (things like an |
| 6407 | * e2fsck being done on the RAID array should execute fast) |
| 6408 | */ |
| 6409 | blk_unplug(mddev->queue); |
| 6410 | cond_resched(); |
| 6411 | |
| 6412 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
| 6413 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
| 6414 | |
| 6415 | if (currspeed > speed_min(mddev)) { |
| 6416 | if ((currspeed > speed_max(mddev)) || |
| 6417 | !is_mddev_idle(mddev, 0)) { |
| 6418 | msleep(500); |
| 6419 | goto repeat; |
| 6420 | } |
| 6421 | } |
| 6422 | } |
| 6423 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
| 6424 | /* |
| 6425 | * this also signals 'finished resyncing' to md_stop |
| 6426 | */ |
| 6427 | out: |
| 6428 | blk_unplug(mddev->queue); |
| 6429 | |
| 6430 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
| 6431 | |
| 6432 | /* tell personality that we are finished */ |
| 6433 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
| 6434 | |
| 6435 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
| 6436 | mddev->curr_resync > 2) { |
| 6437 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
| 6438 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
| 6439 | if (mddev->curr_resync >= mddev->recovery_cp) { |
| 6440 | printk(KERN_INFO |
| 6441 | "md: checkpointing %s of %s.\n", |
| 6442 | desc, mdname(mddev)); |
| 6443 | mddev->recovery_cp = mddev->curr_resync; |
| 6444 | } |
| 6445 | } else |
| 6446 | mddev->recovery_cp = MaxSector; |
| 6447 | } else { |
| 6448 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
| 6449 | mddev->curr_resync = MaxSector; |
| 6450 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 6451 | if (rdev->raid_disk >= 0 && |
| 6452 | !test_bit(Faulty, &rdev->flags) && |
| 6453 | !test_bit(In_sync, &rdev->flags) && |
| 6454 | rdev->recovery_offset < mddev->curr_resync) |
| 6455 | rdev->recovery_offset = mddev->curr_resync; |
| 6456 | } |
| 6457 | } |
| 6458 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| 6459 | |
| 6460 | skip: |
| 6461 | mddev->curr_resync = 0; |
| 6462 | mddev->resync_min = 0; |
| 6463 | mddev->resync_max = MaxSector; |
| 6464 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
| 6465 | wake_up(&resync_wait); |
| 6466 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); |
| 6467 | md_wakeup_thread(mddev->thread); |
| 6468 | return; |
| 6469 | |
| 6470 | interrupted: |
| 6471 | /* |
| 6472 | * got a signal, exit. |
| 6473 | */ |
| 6474 | printk(KERN_INFO |
| 6475 | "md: md_do_sync() got signal ... exiting\n"); |
| 6476 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 6477 | goto out; |
| 6478 | |
| 6479 | } |
| 6480 | EXPORT_SYMBOL_GPL(md_do_sync); |
| 6481 | |
| 6482 | |
| 6483 | static int remove_and_add_spares(mddev_t *mddev) |
| 6484 | { |
| 6485 | mdk_rdev_t *rdev; |
| 6486 | int spares = 0; |
| 6487 | |
| 6488 | mddev->curr_resync_completed = 0; |
| 6489 | |
| 6490 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 6491 | if (rdev->raid_disk >= 0 && |
| 6492 | !test_bit(Blocked, &rdev->flags) && |
| 6493 | (test_bit(Faulty, &rdev->flags) || |
| 6494 | ! test_bit(In_sync, &rdev->flags)) && |
| 6495 | atomic_read(&rdev->nr_pending)==0) { |
| 6496 | if (mddev->pers->hot_remove_disk( |
| 6497 | mddev, rdev->raid_disk)==0) { |
| 6498 | char nm[20]; |
| 6499 | sprintf(nm,"rd%d", rdev->raid_disk); |
| 6500 | sysfs_remove_link(&mddev->kobj, nm); |
| 6501 | rdev->raid_disk = -1; |
| 6502 | } |
| 6503 | } |
| 6504 | |
| 6505 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
| 6506 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
| 6507 | if (rdev->raid_disk >= 0 && |
| 6508 | !test_bit(In_sync, &rdev->flags) && |
| 6509 | !test_bit(Blocked, &rdev->flags)) |
| 6510 | spares++; |
| 6511 | if (rdev->raid_disk < 0 |
| 6512 | && !test_bit(Faulty, &rdev->flags)) { |
| 6513 | rdev->recovery_offset = 0; |
| 6514 | if (mddev->pers-> |
| 6515 | hot_add_disk(mddev, rdev) == 0) { |
| 6516 | char nm[20]; |
| 6517 | sprintf(nm, "rd%d", rdev->raid_disk); |
| 6518 | if (sysfs_create_link(&mddev->kobj, |
| 6519 | &rdev->kobj, nm)) |
| 6520 | printk(KERN_WARNING |
| 6521 | "md: cannot register " |
| 6522 | "%s for %s\n", |
| 6523 | nm, mdname(mddev)); |
| 6524 | spares++; |
| 6525 | md_new_event(mddev); |
| 6526 | } else |
| 6527 | break; |
| 6528 | } |
| 6529 | } |
| 6530 | } |
| 6531 | return spares; |
| 6532 | } |
| 6533 | /* |
| 6534 | * This routine is regularly called by all per-raid-array threads to |
| 6535 | * deal with generic issues like resync and super-block update. |
| 6536 | * Raid personalities that don't have a thread (linear/raid0) do not |
| 6537 | * need this as they never do any recovery or update the superblock. |
| 6538 | * |
| 6539 | * It does not do any resync itself, but rather "forks" off other threads |
| 6540 | * to do that as needed. |
| 6541 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in |
| 6542 | * "->recovery" and create a thread at ->sync_thread. |
| 6543 | * When the thread finishes it sets MD_RECOVERY_DONE |
| 6544 | * and wakeups up this thread which will reap the thread and finish up. |
| 6545 | * This thread also removes any faulty devices (with nr_pending == 0). |
| 6546 | * |
| 6547 | * The overall approach is: |
| 6548 | * 1/ if the superblock needs updating, update it. |
| 6549 | * 2/ If a recovery thread is running, don't do anything else. |
| 6550 | * 3/ If recovery has finished, clean up, possibly marking spares active. |
| 6551 | * 4/ If there are any faulty devices, remove them. |
| 6552 | * 5/ If array is degraded, try to add spares devices |
| 6553 | * 6/ If array has spares or is not in-sync, start a resync thread. |
| 6554 | */ |
| 6555 | void md_check_recovery(mddev_t *mddev) |
| 6556 | { |
| 6557 | mdk_rdev_t *rdev; |
| 6558 | |
| 6559 | |
| 6560 | if (mddev->bitmap) |
| 6561 | bitmap_daemon_work(mddev->bitmap); |
| 6562 | |
| 6563 | if (mddev->ro) |
| 6564 | return; |
| 6565 | |
| 6566 | if (signal_pending(current)) { |
| 6567 | if (mddev->pers->sync_request && !mddev->external) { |
| 6568 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
| 6569 | mdname(mddev)); |
| 6570 | mddev->safemode = 2; |
| 6571 | } |
| 6572 | flush_signals(current); |
| 6573 | } |
| 6574 | |
| 6575 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
| 6576 | return; |
| 6577 | if ( ! ( |
| 6578 | (mddev->flags && !mddev->external) || |
| 6579 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
| 6580 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
| 6581 | (mddev->external == 0 && mddev->safemode == 1) || |
| 6582 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
| 6583 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) |
| 6584 | )) |
| 6585 | return; |
| 6586 | |
| 6587 | if (mddev_trylock(mddev)) { |
| 6588 | int spares = 0; |
| 6589 | |
| 6590 | if (mddev->ro) { |
| 6591 | /* Only thing we do on a ro array is remove |
| 6592 | * failed devices. |
| 6593 | */ |
| 6594 | remove_and_add_spares(mddev); |
| 6595 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 6596 | goto unlock; |
| 6597 | } |
| 6598 | |
| 6599 | if (!mddev->external) { |
| 6600 | int did_change = 0; |
| 6601 | spin_lock_irq(&mddev->write_lock); |
| 6602 | if (mddev->safemode && |
| 6603 | !atomic_read(&mddev->writes_pending) && |
| 6604 | !mddev->in_sync && |
| 6605 | mddev->recovery_cp == MaxSector) { |
| 6606 | mddev->in_sync = 1; |
| 6607 | did_change = 1; |
| 6608 | if (mddev->persistent) |
| 6609 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
| 6610 | } |
| 6611 | if (mddev->safemode == 1) |
| 6612 | mddev->safemode = 0; |
| 6613 | spin_unlock_irq(&mddev->write_lock); |
| 6614 | if (did_change) |
| 6615 | sysfs_notify_dirent(mddev->sysfs_state); |
| 6616 | } |
| 6617 | |
| 6618 | if (mddev->flags) |
| 6619 | md_update_sb(mddev, 0); |
| 6620 | |
| 6621 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 6622 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
| 6623 | sysfs_notify_dirent(rdev->sysfs_state); |
| 6624 | |
| 6625 | |
| 6626 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
| 6627 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { |
| 6628 | /* resync/recovery still happening */ |
| 6629 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 6630 | goto unlock; |
| 6631 | } |
| 6632 | if (mddev->sync_thread) { |
| 6633 | /* resync has finished, collect result */ |
| 6634 | md_unregister_thread(mddev->sync_thread); |
| 6635 | mddev->sync_thread = NULL; |
| 6636 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
| 6637 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { |
| 6638 | /* success...*/ |
| 6639 | /* activate any spares */ |
| 6640 | if (mddev->pers->spare_active(mddev)) |
| 6641 | sysfs_notify(&mddev->kobj, NULL, |
| 6642 | "degraded"); |
| 6643 | } |
| 6644 | md_update_sb(mddev, 1); |
| 6645 | |
| 6646 | /* if array is no-longer degraded, then any saved_raid_disk |
| 6647 | * information must be scrapped |
| 6648 | */ |
| 6649 | if (!mddev->degraded) |
| 6650 | list_for_each_entry(rdev, &mddev->disks, same_set) |
| 6651 | rdev->saved_raid_disk = -1; |
| 6652 | |
| 6653 | mddev->recovery = 0; |
| 6654 | /* flag recovery needed just to double check */ |
| 6655 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 6656 | sysfs_notify_dirent(mddev->sysfs_action); |
| 6657 | md_new_event(mddev); |
| 6658 | goto unlock; |
| 6659 | } |
| 6660 | /* Set RUNNING before clearing NEEDED to avoid |
| 6661 | * any transients in the value of "sync_action". |
| 6662 | */ |
| 6663 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 6664 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 6665 | /* Clear some bits that don't mean anything, but |
| 6666 | * might be left set |
| 6667 | */ |
| 6668 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
| 6669 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
| 6670 | |
| 6671 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
| 6672 | goto unlock; |
| 6673 | /* no recovery is running. |
| 6674 | * remove any failed drives, then |
| 6675 | * add spares if possible. |
| 6676 | * Spare are also removed and re-added, to allow |
| 6677 | * the personality to fail the re-add. |
| 6678 | */ |
| 6679 | |
| 6680 | if (mddev->reshape_position != MaxSector) { |
| 6681 | if (mddev->pers->check_reshape(mddev) != 0) |
| 6682 | /* Cannot proceed */ |
| 6683 | goto unlock; |
| 6684 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
| 6685 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 6686 | } else if ((spares = remove_and_add_spares(mddev))) { |
| 6687 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 6688 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
| 6689 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
| 6690 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 6691 | } else if (mddev->recovery_cp < MaxSector) { |
| 6692 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
| 6693 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
| 6694 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
| 6695 | /* nothing to be done ... */ |
| 6696 | goto unlock; |
| 6697 | |
| 6698 | if (mddev->pers->sync_request) { |
| 6699 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
| 6700 | /* We are adding a device or devices to an array |
| 6701 | * which has the bitmap stored on all devices. |
| 6702 | * So make sure all bitmap pages get written |
| 6703 | */ |
| 6704 | bitmap_write_all(mddev->bitmap); |
| 6705 | } |
| 6706 | mddev->sync_thread = md_register_thread(md_do_sync, |
| 6707 | mddev, |
| 6708 | "%s_resync"); |
| 6709 | if (!mddev->sync_thread) { |
| 6710 | printk(KERN_ERR "%s: could not start resync" |
| 6711 | " thread...\n", |
| 6712 | mdname(mddev)); |
| 6713 | /* leave the spares where they are, it shouldn't hurt */ |
| 6714 | mddev->recovery = 0; |
| 6715 | } else |
| 6716 | md_wakeup_thread(mddev->sync_thread); |
| 6717 | sysfs_notify_dirent(mddev->sysfs_action); |
| 6718 | md_new_event(mddev); |
| 6719 | } |
| 6720 | unlock: |
| 6721 | if (!mddev->sync_thread) { |
| 6722 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
| 6723 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
| 6724 | &mddev->recovery)) |
| 6725 | if (mddev->sysfs_action) |
| 6726 | sysfs_notify_dirent(mddev->sysfs_action); |
| 6727 | } |
| 6728 | mddev_unlock(mddev); |
| 6729 | } |
| 6730 | } |
| 6731 | |
| 6732 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
| 6733 | { |
| 6734 | sysfs_notify_dirent(rdev->sysfs_state); |
| 6735 | wait_event_timeout(rdev->blocked_wait, |
| 6736 | !test_bit(Blocked, &rdev->flags), |
| 6737 | msecs_to_jiffies(5000)); |
| 6738 | rdev_dec_pending(rdev, mddev); |
| 6739 | } |
| 6740 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); |
| 6741 | |
| 6742 | static int md_notify_reboot(struct notifier_block *this, |
| 6743 | unsigned long code, void *x) |
| 6744 | { |
| 6745 | struct list_head *tmp; |
| 6746 | mddev_t *mddev; |
| 6747 | |
| 6748 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { |
| 6749 | |
| 6750 | printk(KERN_INFO "md: stopping all md devices.\n"); |
| 6751 | |
| 6752 | for_each_mddev(mddev, tmp) |
| 6753 | if (mddev_trylock(mddev)) { |
| 6754 | /* Force a switch to readonly even array |
| 6755 | * appears to still be in use. Hence |
| 6756 | * the '100'. |
| 6757 | */ |
| 6758 | do_md_stop(mddev, 1, 100); |
| 6759 | mddev_unlock(mddev); |
| 6760 | } |
| 6761 | /* |
| 6762 | * certain more exotic SCSI devices are known to be |
| 6763 | * volatile wrt too early system reboots. While the |
| 6764 | * right place to handle this issue is the given |
| 6765 | * driver, we do want to have a safe RAID driver ... |
| 6766 | */ |
| 6767 | mdelay(1000*1); |
| 6768 | } |
| 6769 | return NOTIFY_DONE; |
| 6770 | } |
| 6771 | |
| 6772 | static struct notifier_block md_notifier = { |
| 6773 | .notifier_call = md_notify_reboot, |
| 6774 | .next = NULL, |
| 6775 | .priority = INT_MAX, /* before any real devices */ |
| 6776 | }; |
| 6777 | |
| 6778 | static void md_geninit(void) |
| 6779 | { |
| 6780 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
| 6781 | |
| 6782 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
| 6783 | } |
| 6784 | |
| 6785 | static int __init md_init(void) |
| 6786 | { |
| 6787 | if (register_blkdev(MD_MAJOR, "md")) |
| 6788 | return -1; |
| 6789 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { |
| 6790 | unregister_blkdev(MD_MAJOR, "md"); |
| 6791 | return -1; |
| 6792 | } |
| 6793 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
| 6794 | md_probe, NULL, NULL); |
| 6795 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, |
| 6796 | md_probe, NULL, NULL); |
| 6797 | |
| 6798 | register_reboot_notifier(&md_notifier); |
| 6799 | raid_table_header = register_sysctl_table(raid_root_table); |
| 6800 | |
| 6801 | md_geninit(); |
| 6802 | return 0; |
| 6803 | } |
| 6804 | |
| 6805 | |
| 6806 | #ifndef MODULE |
| 6807 | |
| 6808 | /* |
| 6809 | * Searches all registered partitions for autorun RAID arrays |
| 6810 | * at boot time. |
| 6811 | */ |
| 6812 | |
| 6813 | static LIST_HEAD(all_detected_devices); |
| 6814 | struct detected_devices_node { |
| 6815 | struct list_head list; |
| 6816 | dev_t dev; |
| 6817 | }; |
| 6818 | |
| 6819 | void md_autodetect_dev(dev_t dev) |
| 6820 | { |
| 6821 | struct detected_devices_node *node_detected_dev; |
| 6822 | |
| 6823 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); |
| 6824 | if (node_detected_dev) { |
| 6825 | node_detected_dev->dev = dev; |
| 6826 | list_add_tail(&node_detected_dev->list, &all_detected_devices); |
| 6827 | } else { |
| 6828 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" |
| 6829 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); |
| 6830 | } |
| 6831 | } |
| 6832 | |
| 6833 | |
| 6834 | static void autostart_arrays(int part) |
| 6835 | { |
| 6836 | mdk_rdev_t *rdev; |
| 6837 | struct detected_devices_node *node_detected_dev; |
| 6838 | dev_t dev; |
| 6839 | int i_scanned, i_passed; |
| 6840 | |
| 6841 | i_scanned = 0; |
| 6842 | i_passed = 0; |
| 6843 | |
| 6844 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
| 6845 | |
| 6846 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
| 6847 | i_scanned++; |
| 6848 | node_detected_dev = list_entry(all_detected_devices.next, |
| 6849 | struct detected_devices_node, list); |
| 6850 | list_del(&node_detected_dev->list); |
| 6851 | dev = node_detected_dev->dev; |
| 6852 | kfree(node_detected_dev); |
| 6853 | rdev = md_import_device(dev,0, 90); |
| 6854 | if (IS_ERR(rdev)) |
| 6855 | continue; |
| 6856 | |
| 6857 | if (test_bit(Faulty, &rdev->flags)) { |
| 6858 | MD_BUG(); |
| 6859 | continue; |
| 6860 | } |
| 6861 | set_bit(AutoDetected, &rdev->flags); |
| 6862 | list_add(&rdev->same_set, &pending_raid_disks); |
| 6863 | i_passed++; |
| 6864 | } |
| 6865 | |
| 6866 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", |
| 6867 | i_scanned, i_passed); |
| 6868 | |
| 6869 | autorun_devices(part); |
| 6870 | } |
| 6871 | |
| 6872 | #endif /* !MODULE */ |
| 6873 | |
| 6874 | static __exit void md_exit(void) |
| 6875 | { |
| 6876 | mddev_t *mddev; |
| 6877 | struct list_head *tmp; |
| 6878 | |
| 6879 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
| 6880 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
| 6881 | |
| 6882 | unregister_blkdev(MD_MAJOR,"md"); |
| 6883 | unregister_blkdev(mdp_major, "mdp"); |
| 6884 | unregister_reboot_notifier(&md_notifier); |
| 6885 | unregister_sysctl_table(raid_table_header); |
| 6886 | remove_proc_entry("mdstat", NULL); |
| 6887 | for_each_mddev(mddev, tmp) { |
| 6888 | export_array(mddev); |
| 6889 | mddev->hold_active = 0; |
| 6890 | } |
| 6891 | } |
| 6892 | |
| 6893 | subsys_initcall(md_init); |
| 6894 | module_exit(md_exit) |
| 6895 | |
| 6896 | static int get_ro(char *buffer, struct kernel_param *kp) |
| 6897 | { |
| 6898 | return sprintf(buffer, "%d", start_readonly); |
| 6899 | } |
| 6900 | static int set_ro(const char *val, struct kernel_param *kp) |
| 6901 | { |
| 6902 | char *e; |
| 6903 | int num = simple_strtoul(val, &e, 10); |
| 6904 | if (*val && (*e == '\0' || *e == '\n')) { |
| 6905 | start_readonly = num; |
| 6906 | return 0; |
| 6907 | } |
| 6908 | return -EINVAL; |
| 6909 | } |
| 6910 | |
| 6911 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
| 6912 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); |
| 6913 | |
| 6914 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
| 6915 | |
| 6916 | EXPORT_SYMBOL(register_md_personality); |
| 6917 | EXPORT_SYMBOL(unregister_md_personality); |
| 6918 | EXPORT_SYMBOL(md_error); |
| 6919 | EXPORT_SYMBOL(md_done_sync); |
| 6920 | EXPORT_SYMBOL(md_write_start); |
| 6921 | EXPORT_SYMBOL(md_write_end); |
| 6922 | EXPORT_SYMBOL(md_register_thread); |
| 6923 | EXPORT_SYMBOL(md_unregister_thread); |
| 6924 | EXPORT_SYMBOL(md_wakeup_thread); |
| 6925 | EXPORT_SYMBOL(md_check_recovery); |
| 6926 | MODULE_LICENSE("GPL"); |
| 6927 | MODULE_ALIAS("md"); |
| 6928 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |