| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Zoned block device handling |
| 4 | * |
| 5 | * Copyright (c) 2015, Hannes Reinecke |
| 6 | * Copyright (c) 2015, SUSE Linux GmbH |
| 7 | * |
| 8 | * Copyright (c) 2016, Damien Le Moal |
| 9 | * Copyright (c) 2016, Western Digital |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/rbtree.h> |
| 15 | #include <linux/blkdev.h> |
| 16 | #include <linux/blk-mq.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/vmalloc.h> |
| 19 | #include <linux/sched/mm.h> |
| 20 | |
| 21 | #include "blk.h" |
| 22 | |
| 23 | #define ZONE_COND_NAME(name) [BLK_ZONE_COND_##name] = #name |
| 24 | static const char *const zone_cond_name[] = { |
| 25 | ZONE_COND_NAME(NOT_WP), |
| 26 | ZONE_COND_NAME(EMPTY), |
| 27 | ZONE_COND_NAME(IMP_OPEN), |
| 28 | ZONE_COND_NAME(EXP_OPEN), |
| 29 | ZONE_COND_NAME(CLOSED), |
| 30 | ZONE_COND_NAME(READONLY), |
| 31 | ZONE_COND_NAME(FULL), |
| 32 | ZONE_COND_NAME(OFFLINE), |
| 33 | }; |
| 34 | #undef ZONE_COND_NAME |
| 35 | |
| 36 | /** |
| 37 | * blk_zone_cond_str - Return string XXX in BLK_ZONE_COND_XXX. |
| 38 | * @zone_cond: BLK_ZONE_COND_XXX. |
| 39 | * |
| 40 | * Description: Centralize block layer function to convert BLK_ZONE_COND_XXX |
| 41 | * into string format. Useful in the debugging and tracing zone conditions. For |
| 42 | * invalid BLK_ZONE_COND_XXX it returns string "UNKNOWN". |
| 43 | */ |
| 44 | const char *blk_zone_cond_str(enum blk_zone_cond zone_cond) |
| 45 | { |
| 46 | static const char *zone_cond_str = "UNKNOWN"; |
| 47 | |
| 48 | if (zone_cond < ARRAY_SIZE(zone_cond_name) && zone_cond_name[zone_cond]) |
| 49 | zone_cond_str = zone_cond_name[zone_cond]; |
| 50 | |
| 51 | return zone_cond_str; |
| 52 | } |
| 53 | EXPORT_SYMBOL_GPL(blk_zone_cond_str); |
| 54 | |
| 55 | /* |
| 56 | * Return true if a request is a write requests that needs zone write locking. |
| 57 | */ |
| 58 | bool blk_req_needs_zone_write_lock(struct request *rq) |
| 59 | { |
| 60 | if (!rq->q->disk->seq_zones_wlock) |
| 61 | return false; |
| 62 | |
| 63 | return blk_rq_is_seq_zoned_write(rq); |
| 64 | } |
| 65 | EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock); |
| 66 | |
| 67 | bool blk_req_zone_write_trylock(struct request *rq) |
| 68 | { |
| 69 | unsigned int zno = blk_rq_zone_no(rq); |
| 70 | |
| 71 | if (test_and_set_bit(zno, rq->q->disk->seq_zones_wlock)) |
| 72 | return false; |
| 73 | |
| 74 | WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED); |
| 75 | rq->rq_flags |= RQF_ZONE_WRITE_LOCKED; |
| 76 | |
| 77 | return true; |
| 78 | } |
| 79 | EXPORT_SYMBOL_GPL(blk_req_zone_write_trylock); |
| 80 | |
| 81 | void __blk_req_zone_write_lock(struct request *rq) |
| 82 | { |
| 83 | if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq), |
| 84 | rq->q->disk->seq_zones_wlock))) |
| 85 | return; |
| 86 | |
| 87 | WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED); |
| 88 | rq->rq_flags |= RQF_ZONE_WRITE_LOCKED; |
| 89 | } |
| 90 | EXPORT_SYMBOL_GPL(__blk_req_zone_write_lock); |
| 91 | |
| 92 | void __blk_req_zone_write_unlock(struct request *rq) |
| 93 | { |
| 94 | rq->rq_flags &= ~RQF_ZONE_WRITE_LOCKED; |
| 95 | if (rq->q->disk->seq_zones_wlock) |
| 96 | WARN_ON_ONCE(!test_and_clear_bit(blk_rq_zone_no(rq), |
| 97 | rq->q->disk->seq_zones_wlock)); |
| 98 | } |
| 99 | EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock); |
| 100 | |
| 101 | /** |
| 102 | * bdev_nr_zones - Get number of zones |
| 103 | * @bdev: Target device |
| 104 | * |
| 105 | * Return the total number of zones of a zoned block device. For a block |
| 106 | * device without zone capabilities, the number of zones is always 0. |
| 107 | */ |
| 108 | unsigned int bdev_nr_zones(struct block_device *bdev) |
| 109 | { |
| 110 | sector_t zone_sectors = bdev_zone_sectors(bdev); |
| 111 | |
| 112 | if (!bdev_is_zoned(bdev)) |
| 113 | return 0; |
| 114 | return (bdev_nr_sectors(bdev) + zone_sectors - 1) >> |
| 115 | ilog2(zone_sectors); |
| 116 | } |
| 117 | EXPORT_SYMBOL_GPL(bdev_nr_zones); |
| 118 | |
| 119 | /** |
| 120 | * blkdev_report_zones - Get zones information |
| 121 | * @bdev: Target block device |
| 122 | * @sector: Sector from which to report zones |
| 123 | * @nr_zones: Maximum number of zones to report |
| 124 | * @cb: Callback function called for each reported zone |
| 125 | * @data: Private data for the callback |
| 126 | * |
| 127 | * Description: |
| 128 | * Get zone information starting from the zone containing @sector for at most |
| 129 | * @nr_zones, and call @cb for each zone reported by the device. |
| 130 | * To report all zones in a device starting from @sector, the BLK_ALL_ZONES |
| 131 | * constant can be passed to @nr_zones. |
| 132 | * Returns the number of zones reported by the device, or a negative errno |
| 133 | * value in case of failure. |
| 134 | * |
| 135 | * Note: The caller must use memalloc_noXX_save/restore() calls to control |
| 136 | * memory allocations done within this function. |
| 137 | */ |
| 138 | int blkdev_report_zones(struct block_device *bdev, sector_t sector, |
| 139 | unsigned int nr_zones, report_zones_cb cb, void *data) |
| 140 | { |
| 141 | struct gendisk *disk = bdev->bd_disk; |
| 142 | sector_t capacity = get_capacity(disk); |
| 143 | |
| 144 | if (!bdev_is_zoned(bdev) || WARN_ON_ONCE(!disk->fops->report_zones)) |
| 145 | return -EOPNOTSUPP; |
| 146 | |
| 147 | if (!nr_zones || sector >= capacity) |
| 148 | return 0; |
| 149 | |
| 150 | return disk->fops->report_zones(disk, sector, nr_zones, cb, data); |
| 151 | } |
| 152 | EXPORT_SYMBOL_GPL(blkdev_report_zones); |
| 153 | |
| 154 | static inline unsigned long *blk_alloc_zone_bitmap(int node, |
| 155 | unsigned int nr_zones) |
| 156 | { |
| 157 | return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long), |
| 158 | GFP_NOIO, node); |
| 159 | } |
| 160 | |
| 161 | static int blk_zone_need_reset_cb(struct blk_zone *zone, unsigned int idx, |
| 162 | void *data) |
| 163 | { |
| 164 | /* |
| 165 | * For an all-zones reset, ignore conventional, empty, read-only |
| 166 | * and offline zones. |
| 167 | */ |
| 168 | switch (zone->cond) { |
| 169 | case BLK_ZONE_COND_NOT_WP: |
| 170 | case BLK_ZONE_COND_EMPTY: |
| 171 | case BLK_ZONE_COND_READONLY: |
| 172 | case BLK_ZONE_COND_OFFLINE: |
| 173 | return 0; |
| 174 | default: |
| 175 | set_bit(idx, (unsigned long *)data); |
| 176 | return 0; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | static int blkdev_zone_reset_all_emulated(struct block_device *bdev, |
| 181 | gfp_t gfp_mask) |
| 182 | { |
| 183 | struct gendisk *disk = bdev->bd_disk; |
| 184 | sector_t capacity = bdev_nr_sectors(bdev); |
| 185 | sector_t zone_sectors = bdev_zone_sectors(bdev); |
| 186 | unsigned long *need_reset; |
| 187 | struct bio *bio = NULL; |
| 188 | sector_t sector = 0; |
| 189 | int ret; |
| 190 | |
| 191 | need_reset = blk_alloc_zone_bitmap(disk->queue->node, disk->nr_zones); |
| 192 | if (!need_reset) |
| 193 | return -ENOMEM; |
| 194 | |
| 195 | ret = disk->fops->report_zones(disk, 0, disk->nr_zones, |
| 196 | blk_zone_need_reset_cb, need_reset); |
| 197 | if (ret < 0) |
| 198 | goto out_free_need_reset; |
| 199 | |
| 200 | ret = 0; |
| 201 | while (sector < capacity) { |
| 202 | if (!test_bit(disk_zone_no(disk, sector), need_reset)) { |
| 203 | sector += zone_sectors; |
| 204 | continue; |
| 205 | } |
| 206 | |
| 207 | bio = blk_next_bio(bio, bdev, 0, REQ_OP_ZONE_RESET | REQ_SYNC, |
| 208 | gfp_mask); |
| 209 | bio->bi_iter.bi_sector = sector; |
| 210 | sector += zone_sectors; |
| 211 | |
| 212 | /* This may take a while, so be nice to others */ |
| 213 | cond_resched(); |
| 214 | } |
| 215 | |
| 216 | if (bio) { |
| 217 | ret = submit_bio_wait(bio); |
| 218 | bio_put(bio); |
| 219 | } |
| 220 | |
| 221 | out_free_need_reset: |
| 222 | kfree(need_reset); |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | static int blkdev_zone_reset_all(struct block_device *bdev, gfp_t gfp_mask) |
| 227 | { |
| 228 | struct bio bio; |
| 229 | |
| 230 | bio_init(&bio, bdev, NULL, 0, REQ_OP_ZONE_RESET_ALL | REQ_SYNC); |
| 231 | return submit_bio_wait(&bio); |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * blkdev_zone_mgmt - Execute a zone management operation on a range of zones |
| 236 | * @bdev: Target block device |
| 237 | * @op: Operation to be performed on the zones |
| 238 | * @sector: Start sector of the first zone to operate on |
| 239 | * @nr_sectors: Number of sectors, should be at least the length of one zone and |
| 240 | * must be zone size aligned. |
| 241 | * @gfp_mask: Memory allocation flags (for bio_alloc) |
| 242 | * |
| 243 | * Description: |
| 244 | * Perform the specified operation on the range of zones specified by |
| 245 | * @sector..@sector+@nr_sectors. Specifying the entire disk sector range |
| 246 | * is valid, but the specified range should not contain conventional zones. |
| 247 | * The operation to execute on each zone can be a zone reset, open, close |
| 248 | * or finish request. |
| 249 | */ |
| 250 | int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op, |
| 251 | sector_t sector, sector_t nr_sectors, gfp_t gfp_mask) |
| 252 | { |
| 253 | struct request_queue *q = bdev_get_queue(bdev); |
| 254 | sector_t zone_sectors = bdev_zone_sectors(bdev); |
| 255 | sector_t capacity = bdev_nr_sectors(bdev); |
| 256 | sector_t end_sector = sector + nr_sectors; |
| 257 | struct bio *bio = NULL; |
| 258 | int ret = 0; |
| 259 | |
| 260 | if (!bdev_is_zoned(bdev)) |
| 261 | return -EOPNOTSUPP; |
| 262 | |
| 263 | if (bdev_read_only(bdev)) |
| 264 | return -EPERM; |
| 265 | |
| 266 | if (!op_is_zone_mgmt(op)) |
| 267 | return -EOPNOTSUPP; |
| 268 | |
| 269 | if (end_sector <= sector || end_sector > capacity) |
| 270 | /* Out of range */ |
| 271 | return -EINVAL; |
| 272 | |
| 273 | /* Check alignment (handle eventual smaller last zone) */ |
| 274 | if (!bdev_is_zone_start(bdev, sector)) |
| 275 | return -EINVAL; |
| 276 | |
| 277 | if (!bdev_is_zone_start(bdev, nr_sectors) && end_sector != capacity) |
| 278 | return -EINVAL; |
| 279 | |
| 280 | /* |
| 281 | * In the case of a zone reset operation over all zones, |
| 282 | * REQ_OP_ZONE_RESET_ALL can be used with devices supporting this |
| 283 | * command. For other devices, we emulate this command behavior by |
| 284 | * identifying the zones needing a reset. |
| 285 | */ |
| 286 | if (op == REQ_OP_ZONE_RESET && sector == 0 && nr_sectors == capacity) { |
| 287 | if (!blk_queue_zone_resetall(q)) |
| 288 | return blkdev_zone_reset_all_emulated(bdev, gfp_mask); |
| 289 | return blkdev_zone_reset_all(bdev, gfp_mask); |
| 290 | } |
| 291 | |
| 292 | while (sector < end_sector) { |
| 293 | bio = blk_next_bio(bio, bdev, 0, op | REQ_SYNC, gfp_mask); |
| 294 | bio->bi_iter.bi_sector = sector; |
| 295 | sector += zone_sectors; |
| 296 | |
| 297 | /* This may take a while, so be nice to others */ |
| 298 | cond_resched(); |
| 299 | } |
| 300 | |
| 301 | ret = submit_bio_wait(bio); |
| 302 | bio_put(bio); |
| 303 | |
| 304 | return ret; |
| 305 | } |
| 306 | EXPORT_SYMBOL_GPL(blkdev_zone_mgmt); |
| 307 | |
| 308 | struct zone_report_args { |
| 309 | struct blk_zone __user *zones; |
| 310 | }; |
| 311 | |
| 312 | static int blkdev_copy_zone_to_user(struct blk_zone *zone, unsigned int idx, |
| 313 | void *data) |
| 314 | { |
| 315 | struct zone_report_args *args = data; |
| 316 | |
| 317 | if (copy_to_user(&args->zones[idx], zone, sizeof(struct blk_zone))) |
| 318 | return -EFAULT; |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * BLKREPORTZONE ioctl processing. |
| 324 | * Called from blkdev_ioctl. |
| 325 | */ |
| 326 | int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd, |
| 327 | unsigned long arg) |
| 328 | { |
| 329 | void __user *argp = (void __user *)arg; |
| 330 | struct zone_report_args args; |
| 331 | struct blk_zone_report rep; |
| 332 | int ret; |
| 333 | |
| 334 | if (!argp) |
| 335 | return -EINVAL; |
| 336 | |
| 337 | if (!bdev_is_zoned(bdev)) |
| 338 | return -ENOTTY; |
| 339 | |
| 340 | if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report))) |
| 341 | return -EFAULT; |
| 342 | |
| 343 | if (!rep.nr_zones) |
| 344 | return -EINVAL; |
| 345 | |
| 346 | args.zones = argp + sizeof(struct blk_zone_report); |
| 347 | ret = blkdev_report_zones(bdev, rep.sector, rep.nr_zones, |
| 348 | blkdev_copy_zone_to_user, &args); |
| 349 | if (ret < 0) |
| 350 | return ret; |
| 351 | |
| 352 | rep.nr_zones = ret; |
| 353 | rep.flags = BLK_ZONE_REP_CAPACITY; |
| 354 | if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) |
| 355 | return -EFAULT; |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | static int blkdev_truncate_zone_range(struct block_device *bdev, |
| 360 | blk_mode_t mode, const struct blk_zone_range *zrange) |
| 361 | { |
| 362 | loff_t start, end; |
| 363 | |
| 364 | if (zrange->sector + zrange->nr_sectors <= zrange->sector || |
| 365 | zrange->sector + zrange->nr_sectors > get_capacity(bdev->bd_disk)) |
| 366 | /* Out of range */ |
| 367 | return -EINVAL; |
| 368 | |
| 369 | start = zrange->sector << SECTOR_SHIFT; |
| 370 | end = ((zrange->sector + zrange->nr_sectors) << SECTOR_SHIFT) - 1; |
| 371 | |
| 372 | return truncate_bdev_range(bdev, mode, start, end); |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | * BLKRESETZONE, BLKOPENZONE, BLKCLOSEZONE and BLKFINISHZONE ioctl processing. |
| 377 | * Called from blkdev_ioctl. |
| 378 | */ |
| 379 | int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode, |
| 380 | unsigned int cmd, unsigned long arg) |
| 381 | { |
| 382 | void __user *argp = (void __user *)arg; |
| 383 | struct blk_zone_range zrange; |
| 384 | enum req_op op; |
| 385 | int ret; |
| 386 | |
| 387 | if (!argp) |
| 388 | return -EINVAL; |
| 389 | |
| 390 | if (!bdev_is_zoned(bdev)) |
| 391 | return -ENOTTY; |
| 392 | |
| 393 | if (!(mode & BLK_OPEN_WRITE)) |
| 394 | return -EBADF; |
| 395 | |
| 396 | if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range))) |
| 397 | return -EFAULT; |
| 398 | |
| 399 | switch (cmd) { |
| 400 | case BLKRESETZONE: |
| 401 | op = REQ_OP_ZONE_RESET; |
| 402 | |
| 403 | /* Invalidate the page cache, including dirty pages. */ |
| 404 | filemap_invalidate_lock(bdev->bd_inode->i_mapping); |
| 405 | ret = blkdev_truncate_zone_range(bdev, mode, &zrange); |
| 406 | if (ret) |
| 407 | goto fail; |
| 408 | break; |
| 409 | case BLKOPENZONE: |
| 410 | op = REQ_OP_ZONE_OPEN; |
| 411 | break; |
| 412 | case BLKCLOSEZONE: |
| 413 | op = REQ_OP_ZONE_CLOSE; |
| 414 | break; |
| 415 | case BLKFINISHZONE: |
| 416 | op = REQ_OP_ZONE_FINISH; |
| 417 | break; |
| 418 | default: |
| 419 | return -ENOTTY; |
| 420 | } |
| 421 | |
| 422 | ret = blkdev_zone_mgmt(bdev, op, zrange.sector, zrange.nr_sectors, |
| 423 | GFP_KERNEL); |
| 424 | |
| 425 | fail: |
| 426 | if (cmd == BLKRESETZONE) |
| 427 | filemap_invalidate_unlock(bdev->bd_inode->i_mapping); |
| 428 | |
| 429 | return ret; |
| 430 | } |
| 431 | |
| 432 | void disk_free_zone_bitmaps(struct gendisk *disk) |
| 433 | { |
| 434 | kfree(disk->conv_zones_bitmap); |
| 435 | disk->conv_zones_bitmap = NULL; |
| 436 | kfree(disk->seq_zones_wlock); |
| 437 | disk->seq_zones_wlock = NULL; |
| 438 | } |
| 439 | |
| 440 | struct blk_revalidate_zone_args { |
| 441 | struct gendisk *disk; |
| 442 | unsigned long *conv_zones_bitmap; |
| 443 | unsigned long *seq_zones_wlock; |
| 444 | unsigned int nr_zones; |
| 445 | sector_t zone_sectors; |
| 446 | sector_t sector; |
| 447 | }; |
| 448 | |
| 449 | /* |
| 450 | * Helper function to check the validity of zones of a zoned block device. |
| 451 | */ |
| 452 | static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx, |
| 453 | void *data) |
| 454 | { |
| 455 | struct blk_revalidate_zone_args *args = data; |
| 456 | struct gendisk *disk = args->disk; |
| 457 | struct request_queue *q = disk->queue; |
| 458 | sector_t capacity = get_capacity(disk); |
| 459 | |
| 460 | /* |
| 461 | * All zones must have the same size, with the exception on an eventual |
| 462 | * smaller last zone. |
| 463 | */ |
| 464 | if (zone->start == 0) { |
| 465 | if (zone->len == 0 || !is_power_of_2(zone->len)) { |
| 466 | pr_warn("%s: Invalid zoned device with non power of two zone size (%llu)\n", |
| 467 | disk->disk_name, zone->len); |
| 468 | return -ENODEV; |
| 469 | } |
| 470 | |
| 471 | args->zone_sectors = zone->len; |
| 472 | args->nr_zones = (capacity + zone->len - 1) >> ilog2(zone->len); |
| 473 | } else if (zone->start + args->zone_sectors < capacity) { |
| 474 | if (zone->len != args->zone_sectors) { |
| 475 | pr_warn("%s: Invalid zoned device with non constant zone size\n", |
| 476 | disk->disk_name); |
| 477 | return -ENODEV; |
| 478 | } |
| 479 | } else { |
| 480 | if (zone->len > args->zone_sectors) { |
| 481 | pr_warn("%s: Invalid zoned device with larger last zone size\n", |
| 482 | disk->disk_name); |
| 483 | return -ENODEV; |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | /* Check for holes in the zone report */ |
| 488 | if (zone->start != args->sector) { |
| 489 | pr_warn("%s: Zone gap at sectors %llu..%llu\n", |
| 490 | disk->disk_name, args->sector, zone->start); |
| 491 | return -ENODEV; |
| 492 | } |
| 493 | |
| 494 | /* Check zone type */ |
| 495 | switch (zone->type) { |
| 496 | case BLK_ZONE_TYPE_CONVENTIONAL: |
| 497 | if (!args->conv_zones_bitmap) { |
| 498 | args->conv_zones_bitmap = |
| 499 | blk_alloc_zone_bitmap(q->node, args->nr_zones); |
| 500 | if (!args->conv_zones_bitmap) |
| 501 | return -ENOMEM; |
| 502 | } |
| 503 | set_bit(idx, args->conv_zones_bitmap); |
| 504 | break; |
| 505 | case BLK_ZONE_TYPE_SEQWRITE_REQ: |
| 506 | case BLK_ZONE_TYPE_SEQWRITE_PREF: |
| 507 | if (!args->seq_zones_wlock) { |
| 508 | args->seq_zones_wlock = |
| 509 | blk_alloc_zone_bitmap(q->node, args->nr_zones); |
| 510 | if (!args->seq_zones_wlock) |
| 511 | return -ENOMEM; |
| 512 | } |
| 513 | break; |
| 514 | default: |
| 515 | pr_warn("%s: Invalid zone type 0x%x at sectors %llu\n", |
| 516 | disk->disk_name, (int)zone->type, zone->start); |
| 517 | return -ENODEV; |
| 518 | } |
| 519 | |
| 520 | args->sector += zone->len; |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | /** |
| 525 | * blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps |
| 526 | * @disk: Target disk |
| 527 | * @update_driver_data: Callback to update driver data on the frozen disk |
| 528 | * |
| 529 | * Helper function for low-level device drivers to (re) allocate and initialize |
| 530 | * a disk request queue zone bitmaps. This functions should normally be called |
| 531 | * within the disk ->revalidate method for blk-mq based drivers. For BIO based |
| 532 | * drivers only q->nr_zones needs to be updated so that the sysfs exposed value |
| 533 | * is correct. |
| 534 | * If the @update_driver_data callback function is not NULL, the callback is |
| 535 | * executed with the device request queue frozen after all zones have been |
| 536 | * checked. |
| 537 | */ |
| 538 | int blk_revalidate_disk_zones(struct gendisk *disk, |
| 539 | void (*update_driver_data)(struct gendisk *disk)) |
| 540 | { |
| 541 | struct request_queue *q = disk->queue; |
| 542 | struct blk_revalidate_zone_args args = { |
| 543 | .disk = disk, |
| 544 | }; |
| 545 | unsigned int noio_flag; |
| 546 | int ret; |
| 547 | |
| 548 | if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) |
| 549 | return -EIO; |
| 550 | if (WARN_ON_ONCE(!queue_is_mq(q))) |
| 551 | return -EIO; |
| 552 | |
| 553 | if (!get_capacity(disk)) |
| 554 | return -EIO; |
| 555 | |
| 556 | /* |
| 557 | * Ensure that all memory allocations in this context are done as if |
| 558 | * GFP_NOIO was specified. |
| 559 | */ |
| 560 | noio_flag = memalloc_noio_save(); |
| 561 | ret = disk->fops->report_zones(disk, 0, UINT_MAX, |
| 562 | blk_revalidate_zone_cb, &args); |
| 563 | if (!ret) { |
| 564 | pr_warn("%s: No zones reported\n", disk->disk_name); |
| 565 | ret = -ENODEV; |
| 566 | } |
| 567 | memalloc_noio_restore(noio_flag); |
| 568 | |
| 569 | /* |
| 570 | * If zones where reported, make sure that the entire disk capacity |
| 571 | * has been checked. |
| 572 | */ |
| 573 | if (ret > 0 && args.sector != get_capacity(disk)) { |
| 574 | pr_warn("%s: Missing zones from sector %llu\n", |
| 575 | disk->disk_name, args.sector); |
| 576 | ret = -ENODEV; |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Install the new bitmaps and update nr_zones only once the queue is |
| 581 | * stopped and all I/Os are completed (i.e. a scheduler is not |
| 582 | * referencing the bitmaps). |
| 583 | */ |
| 584 | blk_mq_freeze_queue(q); |
| 585 | if (ret > 0) { |
| 586 | blk_queue_chunk_sectors(q, args.zone_sectors); |
| 587 | disk->nr_zones = args.nr_zones; |
| 588 | swap(disk->seq_zones_wlock, args.seq_zones_wlock); |
| 589 | swap(disk->conv_zones_bitmap, args.conv_zones_bitmap); |
| 590 | if (update_driver_data) |
| 591 | update_driver_data(disk); |
| 592 | ret = 0; |
| 593 | } else { |
| 594 | pr_warn("%s: failed to revalidate zones\n", disk->disk_name); |
| 595 | disk_free_zone_bitmaps(disk); |
| 596 | } |
| 597 | blk_mq_unfreeze_queue(q); |
| 598 | |
| 599 | kfree(args.seq_zones_wlock); |
| 600 | kfree(args.conv_zones_bitmap); |
| 601 | return ret; |
| 602 | } |
| 603 | EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones); |
| 604 | |
| 605 | void disk_clear_zone_settings(struct gendisk *disk) |
| 606 | { |
| 607 | struct request_queue *q = disk->queue; |
| 608 | |
| 609 | blk_mq_freeze_queue(q); |
| 610 | |
| 611 | disk_free_zone_bitmaps(disk); |
| 612 | blk_queue_flag_clear(QUEUE_FLAG_ZONE_RESETALL, q); |
| 613 | q->required_elevator_features &= ~ELEVATOR_F_ZBD_SEQ_WRITE; |
| 614 | disk->nr_zones = 0; |
| 615 | disk->max_open_zones = 0; |
| 616 | disk->max_active_zones = 0; |
| 617 | q->limits.chunk_sectors = 0; |
| 618 | q->limits.zone_write_granularity = 0; |
| 619 | q->limits.max_zone_append_sectors = 0; |
| 620 | |
| 621 | blk_mq_unfreeze_queue(q); |
| 622 | } |