1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/vmalloc.h> 3 #include <linux/bitmap.h> 4 #include "null_blk.h" 5 6 #define CREATE_TRACE_POINTS 7 #include "trace.h" 8 9 #undef pr_fmt 10 #define pr_fmt(fmt) "null_blk: " fmt 11 12 #define NULL_ZONE_INVALID_WP ((sector_t)-1) 13 14 static inline sector_t mb_to_sects(unsigned long mb) 15 { 16 return ((sector_t)mb * SZ_1M) >> SECTOR_SHIFT; 17 } 18 19 static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) 20 { 21 return sect >> ilog2(dev->zone_size_sects); 22 } 23 24 static inline void null_init_zone_lock(struct nullb_device *dev, 25 struct nullb_zone *zone) 26 { 27 if (!dev->memory_backed) 28 spin_lock_init(&zone->spinlock); 29 else 30 mutex_init(&zone->mutex); 31 } 32 33 static inline void null_lock_zone(struct nullb_device *dev, 34 struct nullb_zone *zone) 35 { 36 if (!dev->memory_backed) 37 spin_lock_irq(&zone->spinlock); 38 else 39 mutex_lock(&zone->mutex); 40 } 41 42 static inline void null_unlock_zone(struct nullb_device *dev, 43 struct nullb_zone *zone) 44 { 45 if (!dev->memory_backed) 46 spin_unlock_irq(&zone->spinlock); 47 else 48 mutex_unlock(&zone->mutex); 49 } 50 51 int null_init_zoned_dev(struct nullb_device *dev, 52 struct queue_limits *lim) 53 { 54 sector_t dev_capacity_sects, zone_capacity_sects; 55 struct nullb_zone *zone; 56 sector_t sector = 0; 57 unsigned int i; 58 59 if (!is_power_of_2(dev->zone_size)) { 60 pr_err("zone_size must be power-of-two\n"); 61 return -EINVAL; 62 } 63 if (dev->zone_size > dev->size) { 64 pr_err("Zone size larger than device capacity\n"); 65 return -EINVAL; 66 } 67 68 if (!dev->zone_capacity) 69 dev->zone_capacity = dev->zone_size; 70 71 if (dev->zone_capacity > dev->zone_size) { 72 pr_err("zone capacity (%lu MB) larger than zone size (%lu MB)\n", 73 dev->zone_capacity, dev->zone_size); 74 return -EINVAL; 75 } 76 77 /* 78 * If a smaller zone capacity was requested, do not allow a smaller last 79 * zone at the same time as such zone configuration does not correspond 80 * to any real zoned device. 81 */ 82 if (dev->zone_capacity != dev->zone_size && 83 dev->size & (dev->zone_size - 1)) { 84 pr_err("A smaller last zone is not allowed with zone capacity smaller than zone size.\n"); 85 return -EINVAL; 86 } 87 88 zone_capacity_sects = mb_to_sects(dev->zone_capacity); 89 dev_capacity_sects = mb_to_sects(dev->size); 90 dev->zone_size_sects = mb_to_sects(dev->zone_size); 91 dev->nr_zones = round_up(dev_capacity_sects, dev->zone_size_sects) 92 >> ilog2(dev->zone_size_sects); 93 94 dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct nullb_zone), 95 GFP_KERNEL | __GFP_ZERO); 96 if (!dev->zones) 97 return -ENOMEM; 98 99 spin_lock_init(&dev->zone_res_lock); 100 101 if (dev->zone_nr_conv >= dev->nr_zones) { 102 dev->zone_nr_conv = dev->nr_zones - 1; 103 pr_info("changed the number of conventional zones to %u", 104 dev->zone_nr_conv); 105 } 106 107 dev->zone_append_max_sectors = 108 min(ALIGN_DOWN(dev->zone_append_max_sectors, 109 dev->blocksize >> SECTOR_SHIFT), 110 zone_capacity_sects); 111 112 /* Max active zones has to be < nbr of seq zones in order to be enforceable */ 113 if (dev->zone_max_active >= dev->nr_zones - dev->zone_nr_conv) { 114 dev->zone_max_active = 0; 115 pr_info("zone_max_active limit disabled, limit >= zone count\n"); 116 } 117 118 /* Max open zones has to be <= max active zones */ 119 if (dev->zone_max_active && dev->zone_max_open > dev->zone_max_active) { 120 dev->zone_max_open = dev->zone_max_active; 121 pr_info("changed the maximum number of open zones to %u\n", 122 dev->zone_max_open); 123 } else if (dev->zone_max_open >= dev->nr_zones - dev->zone_nr_conv) { 124 dev->zone_max_open = 0; 125 pr_info("zone_max_open limit disabled, limit >= zone count\n"); 126 } 127 dev->need_zone_res_mgmt = dev->zone_max_active || dev->zone_max_open; 128 dev->imp_close_zone_no = dev->zone_nr_conv; 129 130 for (i = 0; i < dev->zone_nr_conv; i++) { 131 zone = &dev->zones[i]; 132 133 null_init_zone_lock(dev, zone); 134 zone->start = sector; 135 zone->len = dev->zone_size_sects; 136 zone->capacity = zone->len; 137 zone->wp = zone->start + zone->len; 138 zone->type = BLK_ZONE_TYPE_CONVENTIONAL; 139 zone->cond = BLK_ZONE_COND_NOT_WP; 140 141 sector += dev->zone_size_sects; 142 } 143 144 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { 145 zone = &dev->zones[i]; 146 147 null_init_zone_lock(dev, zone); 148 zone->start = zone->wp = sector; 149 if (zone->start + dev->zone_size_sects > dev_capacity_sects) 150 zone->len = dev_capacity_sects - zone->start; 151 else 152 zone->len = dev->zone_size_sects; 153 zone->capacity = 154 min_t(sector_t, zone->len, zone_capacity_sects); 155 zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ; 156 zone->cond = BLK_ZONE_COND_EMPTY; 157 158 sector += dev->zone_size_sects; 159 } 160 161 lim->zoned = true; 162 lim->chunk_sectors = dev->zone_size_sects; 163 lim->max_zone_append_sectors = dev->zone_append_max_sectors; 164 lim->max_open_zones = dev->zone_max_open; 165 lim->max_active_zones = dev->zone_max_active; 166 return 0; 167 } 168 169 int null_register_zoned_dev(struct nullb *nullb) 170 { 171 struct request_queue *q = nullb->q; 172 struct gendisk *disk = nullb->disk; 173 174 blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q); 175 disk->nr_zones = bdev_nr_zones(disk->part0); 176 177 pr_info("%s: using %s zone append\n", 178 disk->disk_name, 179 queue_emulates_zone_append(q) ? "emulated" : "native"); 180 181 return blk_revalidate_disk_zones(disk); 182 } 183 184 void null_free_zoned_dev(struct nullb_device *dev) 185 { 186 kvfree(dev->zones); 187 dev->zones = NULL; 188 } 189 190 int null_report_zones(struct gendisk *disk, sector_t sector, 191 unsigned int nr_zones, report_zones_cb cb, void *data) 192 { 193 struct nullb *nullb = disk->private_data; 194 struct nullb_device *dev = nullb->dev; 195 unsigned int first_zone, i; 196 struct nullb_zone *zone; 197 struct blk_zone blkz; 198 int error; 199 200 first_zone = null_zone_no(dev, sector); 201 if (first_zone >= dev->nr_zones) 202 return 0; 203 204 nr_zones = min(nr_zones, dev->nr_zones - first_zone); 205 trace_nullb_report_zones(nullb, nr_zones); 206 207 memset(&blkz, 0, sizeof(struct blk_zone)); 208 zone = &dev->zones[first_zone]; 209 for (i = 0; i < nr_zones; i++, zone++) { 210 /* 211 * Stacked DM target drivers will remap the zone information by 212 * modifying the zone information passed to the report callback. 213 * So use a local copy to avoid corruption of the device zone 214 * array. 215 */ 216 null_lock_zone(dev, zone); 217 blkz.start = zone->start; 218 blkz.len = zone->len; 219 blkz.wp = zone->wp; 220 blkz.type = zone->type; 221 blkz.cond = zone->cond; 222 blkz.capacity = zone->capacity; 223 null_unlock_zone(dev, zone); 224 225 error = cb(&blkz, i, data); 226 if (error) 227 return error; 228 } 229 230 return nr_zones; 231 } 232 233 /* 234 * This is called in the case of memory backing from null_process_cmd() 235 * with the target zone already locked. 236 */ 237 size_t null_zone_valid_read_len(struct nullb *nullb, 238 sector_t sector, unsigned int len) 239 { 240 struct nullb_device *dev = nullb->dev; 241 struct nullb_zone *zone = &dev->zones[null_zone_no(dev, sector)]; 242 unsigned int nr_sectors = len >> SECTOR_SHIFT; 243 244 /* Read must be below the write pointer position */ 245 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL || 246 sector + nr_sectors <= zone->wp) 247 return len; 248 249 if (sector > zone->wp) 250 return 0; 251 252 return (zone->wp - sector) << SECTOR_SHIFT; 253 } 254 255 static void null_close_imp_open_zone(struct nullb_device *dev) 256 { 257 struct nullb_zone *zone; 258 unsigned int zno, i; 259 260 zno = dev->imp_close_zone_no; 261 if (zno >= dev->nr_zones) 262 zno = dev->zone_nr_conv; 263 264 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { 265 zone = &dev->zones[zno]; 266 zno++; 267 if (zno >= dev->nr_zones) 268 zno = dev->zone_nr_conv; 269 270 if (zone->cond == BLK_ZONE_COND_IMP_OPEN) { 271 dev->nr_zones_imp_open--; 272 if (zone->wp == zone->start) { 273 zone->cond = BLK_ZONE_COND_EMPTY; 274 } else { 275 zone->cond = BLK_ZONE_COND_CLOSED; 276 dev->nr_zones_closed++; 277 } 278 dev->imp_close_zone_no = zno; 279 return; 280 } 281 } 282 } 283 284 static blk_status_t null_check_active(struct nullb_device *dev) 285 { 286 if (!dev->zone_max_active) 287 return BLK_STS_OK; 288 289 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open + 290 dev->nr_zones_closed < dev->zone_max_active) 291 return BLK_STS_OK; 292 293 return BLK_STS_ZONE_ACTIVE_RESOURCE; 294 } 295 296 static blk_status_t null_check_open(struct nullb_device *dev) 297 { 298 if (!dev->zone_max_open) 299 return BLK_STS_OK; 300 301 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open < dev->zone_max_open) 302 return BLK_STS_OK; 303 304 if (dev->nr_zones_imp_open) { 305 if (null_check_active(dev) == BLK_STS_OK) { 306 null_close_imp_open_zone(dev); 307 return BLK_STS_OK; 308 } 309 } 310 311 return BLK_STS_ZONE_OPEN_RESOURCE; 312 } 313 314 /* 315 * This function matches the manage open zone resources function in the ZBC standard, 316 * with the addition of max active zones support (added in the ZNS standard). 317 * 318 * The function determines if a zone can transition to implicit open or explicit open, 319 * while maintaining the max open zone (and max active zone) limit(s). It may close an 320 * implicit open zone in order to make additional zone resources available. 321 * 322 * ZBC states that an implicit open zone shall be closed only if there is not 323 * room within the open limit. However, with the addition of an active limit, 324 * it is not certain that closing an implicit open zone will allow a new zone 325 * to be opened, since we might already be at the active limit capacity. 326 */ 327 static blk_status_t null_check_zone_resources(struct nullb_device *dev, 328 struct nullb_zone *zone) 329 { 330 blk_status_t ret; 331 332 switch (zone->cond) { 333 case BLK_ZONE_COND_EMPTY: 334 ret = null_check_active(dev); 335 if (ret != BLK_STS_OK) 336 return ret; 337 fallthrough; 338 case BLK_ZONE_COND_CLOSED: 339 return null_check_open(dev); 340 default: 341 /* Should never be called for other states */ 342 WARN_ON(1); 343 return BLK_STS_IOERR; 344 } 345 } 346 347 static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector, 348 unsigned int nr_sectors, bool append) 349 { 350 struct nullb_device *dev = cmd->nq->dev; 351 unsigned int zno = null_zone_no(dev, sector); 352 struct nullb_zone *zone = &dev->zones[zno]; 353 blk_status_t ret; 354 355 trace_nullb_zone_op(cmd, zno, zone->cond); 356 357 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) { 358 if (append) 359 return BLK_STS_IOERR; 360 return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors); 361 } 362 363 null_lock_zone(dev, zone); 364 365 /* 366 * Regular writes must be at the write pointer position. Zone append 367 * writes are automatically issued at the write pointer and the position 368 * returned using the request sector. Note that we do not check the zone 369 * condition because for FULL, READONLY and OFFLINE zones, the sector 370 * check against the zone write pointer will always result in failing 371 * the command. 372 */ 373 if (append) { 374 if (WARN_ON_ONCE(!dev->zone_append_max_sectors) || 375 zone->wp == NULL_ZONE_INVALID_WP) { 376 ret = BLK_STS_IOERR; 377 goto unlock_zone; 378 } 379 sector = zone->wp; 380 blk_mq_rq_from_pdu(cmd)->__sector = sector; 381 } 382 383 if (sector != zone->wp || 384 zone->wp + nr_sectors > zone->start + zone->capacity) { 385 ret = BLK_STS_IOERR; 386 goto unlock_zone; 387 } 388 389 if (zone->cond == BLK_ZONE_COND_CLOSED || 390 zone->cond == BLK_ZONE_COND_EMPTY) { 391 if (dev->need_zone_res_mgmt) { 392 spin_lock(&dev->zone_res_lock); 393 394 ret = null_check_zone_resources(dev, zone); 395 if (ret != BLK_STS_OK) { 396 spin_unlock(&dev->zone_res_lock); 397 goto unlock_zone; 398 } 399 if (zone->cond == BLK_ZONE_COND_CLOSED) { 400 dev->nr_zones_closed--; 401 dev->nr_zones_imp_open++; 402 } else if (zone->cond == BLK_ZONE_COND_EMPTY) { 403 dev->nr_zones_imp_open++; 404 } 405 406 spin_unlock(&dev->zone_res_lock); 407 } 408 409 zone->cond = BLK_ZONE_COND_IMP_OPEN; 410 } 411 412 ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors); 413 if (ret != BLK_STS_OK) 414 goto unlock_zone; 415 416 zone->wp += nr_sectors; 417 if (zone->wp == zone->start + zone->capacity) { 418 if (dev->need_zone_res_mgmt) { 419 spin_lock(&dev->zone_res_lock); 420 if (zone->cond == BLK_ZONE_COND_EXP_OPEN) 421 dev->nr_zones_exp_open--; 422 else if (zone->cond == BLK_ZONE_COND_IMP_OPEN) 423 dev->nr_zones_imp_open--; 424 spin_unlock(&dev->zone_res_lock); 425 } 426 zone->cond = BLK_ZONE_COND_FULL; 427 } 428 429 ret = BLK_STS_OK; 430 431 unlock_zone: 432 null_unlock_zone(dev, zone); 433 434 return ret; 435 } 436 437 static blk_status_t null_open_zone(struct nullb_device *dev, 438 struct nullb_zone *zone) 439 { 440 blk_status_t ret = BLK_STS_OK; 441 442 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) 443 return BLK_STS_IOERR; 444 445 switch (zone->cond) { 446 case BLK_ZONE_COND_EXP_OPEN: 447 /* Open operation on exp open is not an error */ 448 return BLK_STS_OK; 449 case BLK_ZONE_COND_EMPTY: 450 case BLK_ZONE_COND_IMP_OPEN: 451 case BLK_ZONE_COND_CLOSED: 452 break; 453 case BLK_ZONE_COND_FULL: 454 default: 455 return BLK_STS_IOERR; 456 } 457 458 if (dev->need_zone_res_mgmt) { 459 spin_lock(&dev->zone_res_lock); 460 461 switch (zone->cond) { 462 case BLK_ZONE_COND_EMPTY: 463 ret = null_check_zone_resources(dev, zone); 464 if (ret != BLK_STS_OK) { 465 spin_unlock(&dev->zone_res_lock); 466 return ret; 467 } 468 break; 469 case BLK_ZONE_COND_IMP_OPEN: 470 dev->nr_zones_imp_open--; 471 break; 472 case BLK_ZONE_COND_CLOSED: 473 ret = null_check_zone_resources(dev, zone); 474 if (ret != BLK_STS_OK) { 475 spin_unlock(&dev->zone_res_lock); 476 return ret; 477 } 478 dev->nr_zones_closed--; 479 break; 480 default: 481 break; 482 } 483 484 dev->nr_zones_exp_open++; 485 486 spin_unlock(&dev->zone_res_lock); 487 } 488 489 zone->cond = BLK_ZONE_COND_EXP_OPEN; 490 491 return BLK_STS_OK; 492 } 493 494 static blk_status_t null_close_zone(struct nullb_device *dev, 495 struct nullb_zone *zone) 496 { 497 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) 498 return BLK_STS_IOERR; 499 500 switch (zone->cond) { 501 case BLK_ZONE_COND_CLOSED: 502 /* close operation on closed is not an error */ 503 return BLK_STS_OK; 504 case BLK_ZONE_COND_IMP_OPEN: 505 case BLK_ZONE_COND_EXP_OPEN: 506 break; 507 case BLK_ZONE_COND_EMPTY: 508 case BLK_ZONE_COND_FULL: 509 default: 510 return BLK_STS_IOERR; 511 } 512 513 if (dev->need_zone_res_mgmt) { 514 spin_lock(&dev->zone_res_lock); 515 516 switch (zone->cond) { 517 case BLK_ZONE_COND_IMP_OPEN: 518 dev->nr_zones_imp_open--; 519 break; 520 case BLK_ZONE_COND_EXP_OPEN: 521 dev->nr_zones_exp_open--; 522 break; 523 default: 524 break; 525 } 526 527 if (zone->wp > zone->start) 528 dev->nr_zones_closed++; 529 530 spin_unlock(&dev->zone_res_lock); 531 } 532 533 if (zone->wp == zone->start) 534 zone->cond = BLK_ZONE_COND_EMPTY; 535 else 536 zone->cond = BLK_ZONE_COND_CLOSED; 537 538 return BLK_STS_OK; 539 } 540 541 static blk_status_t null_finish_zone(struct nullb_device *dev, 542 struct nullb_zone *zone) 543 { 544 blk_status_t ret = BLK_STS_OK; 545 546 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) 547 return BLK_STS_IOERR; 548 549 if (dev->need_zone_res_mgmt) { 550 spin_lock(&dev->zone_res_lock); 551 552 switch (zone->cond) { 553 case BLK_ZONE_COND_FULL: 554 /* Finish operation on full is not an error */ 555 spin_unlock(&dev->zone_res_lock); 556 return BLK_STS_OK; 557 case BLK_ZONE_COND_EMPTY: 558 ret = null_check_zone_resources(dev, zone); 559 if (ret != BLK_STS_OK) { 560 spin_unlock(&dev->zone_res_lock); 561 return ret; 562 } 563 break; 564 case BLK_ZONE_COND_IMP_OPEN: 565 dev->nr_zones_imp_open--; 566 break; 567 case BLK_ZONE_COND_EXP_OPEN: 568 dev->nr_zones_exp_open--; 569 break; 570 case BLK_ZONE_COND_CLOSED: 571 ret = null_check_zone_resources(dev, zone); 572 if (ret != BLK_STS_OK) { 573 spin_unlock(&dev->zone_res_lock); 574 return ret; 575 } 576 dev->nr_zones_closed--; 577 break; 578 default: 579 spin_unlock(&dev->zone_res_lock); 580 return BLK_STS_IOERR; 581 } 582 583 spin_unlock(&dev->zone_res_lock); 584 } 585 586 zone->cond = BLK_ZONE_COND_FULL; 587 zone->wp = zone->start + zone->len; 588 589 return BLK_STS_OK; 590 } 591 592 static blk_status_t null_reset_zone(struct nullb_device *dev, 593 struct nullb_zone *zone) 594 { 595 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) 596 return BLK_STS_IOERR; 597 598 if (dev->need_zone_res_mgmt) { 599 spin_lock(&dev->zone_res_lock); 600 601 switch (zone->cond) { 602 case BLK_ZONE_COND_IMP_OPEN: 603 dev->nr_zones_imp_open--; 604 break; 605 case BLK_ZONE_COND_EXP_OPEN: 606 dev->nr_zones_exp_open--; 607 break; 608 case BLK_ZONE_COND_CLOSED: 609 dev->nr_zones_closed--; 610 break; 611 case BLK_ZONE_COND_EMPTY: 612 case BLK_ZONE_COND_FULL: 613 break; 614 default: 615 spin_unlock(&dev->zone_res_lock); 616 return BLK_STS_IOERR; 617 } 618 619 spin_unlock(&dev->zone_res_lock); 620 } 621 622 zone->cond = BLK_ZONE_COND_EMPTY; 623 zone->wp = zone->start; 624 625 if (dev->memory_backed) 626 return null_handle_discard(dev, zone->start, zone->len); 627 628 return BLK_STS_OK; 629 } 630 631 static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_op op, 632 sector_t sector) 633 { 634 struct nullb_device *dev = cmd->nq->dev; 635 unsigned int zone_no; 636 struct nullb_zone *zone; 637 blk_status_t ret; 638 size_t i; 639 640 if (op == REQ_OP_ZONE_RESET_ALL) { 641 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { 642 zone = &dev->zones[i]; 643 null_lock_zone(dev, zone); 644 if (zone->cond != BLK_ZONE_COND_EMPTY && 645 zone->cond != BLK_ZONE_COND_READONLY && 646 zone->cond != BLK_ZONE_COND_OFFLINE) { 647 null_reset_zone(dev, zone); 648 trace_nullb_zone_op(cmd, i, zone->cond); 649 } 650 null_unlock_zone(dev, zone); 651 } 652 return BLK_STS_OK; 653 } 654 655 zone_no = null_zone_no(dev, sector); 656 zone = &dev->zones[zone_no]; 657 658 null_lock_zone(dev, zone); 659 660 if (zone->cond == BLK_ZONE_COND_READONLY || 661 zone->cond == BLK_ZONE_COND_OFFLINE) { 662 ret = BLK_STS_IOERR; 663 goto unlock; 664 } 665 666 switch (op) { 667 case REQ_OP_ZONE_RESET: 668 ret = null_reset_zone(dev, zone); 669 break; 670 case REQ_OP_ZONE_OPEN: 671 ret = null_open_zone(dev, zone); 672 break; 673 case REQ_OP_ZONE_CLOSE: 674 ret = null_close_zone(dev, zone); 675 break; 676 case REQ_OP_ZONE_FINISH: 677 ret = null_finish_zone(dev, zone); 678 break; 679 default: 680 ret = BLK_STS_NOTSUPP; 681 break; 682 } 683 684 if (ret == BLK_STS_OK) 685 trace_nullb_zone_op(cmd, zone_no, zone->cond); 686 687 unlock: 688 null_unlock_zone(dev, zone); 689 690 return ret; 691 } 692 693 blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_op op, 694 sector_t sector, sector_t nr_sectors) 695 { 696 struct nullb_device *dev; 697 struct nullb_zone *zone; 698 blk_status_t sts; 699 700 switch (op) { 701 case REQ_OP_WRITE: 702 return null_zone_write(cmd, sector, nr_sectors, false); 703 case REQ_OP_ZONE_APPEND: 704 return null_zone_write(cmd, sector, nr_sectors, true); 705 case REQ_OP_ZONE_RESET: 706 case REQ_OP_ZONE_RESET_ALL: 707 case REQ_OP_ZONE_OPEN: 708 case REQ_OP_ZONE_CLOSE: 709 case REQ_OP_ZONE_FINISH: 710 return null_zone_mgmt(cmd, op, sector); 711 default: 712 dev = cmd->nq->dev; 713 zone = &dev->zones[null_zone_no(dev, sector)]; 714 if (zone->cond == BLK_ZONE_COND_OFFLINE) 715 return BLK_STS_IOERR; 716 717 null_lock_zone(dev, zone); 718 sts = null_process_cmd(cmd, op, sector, nr_sectors); 719 null_unlock_zone(dev, zone); 720 return sts; 721 } 722 } 723 724 /* 725 * Set a zone in the read-only or offline condition. 726 */ 727 static void null_set_zone_cond(struct nullb_device *dev, 728 struct nullb_zone *zone, enum blk_zone_cond cond) 729 { 730 if (WARN_ON_ONCE(cond != BLK_ZONE_COND_READONLY && 731 cond != BLK_ZONE_COND_OFFLINE)) 732 return; 733 734 null_lock_zone(dev, zone); 735 736 /* 737 * If the read-only condition is requested again to zones already in 738 * read-only condition, restore back normal empty condition. Do the same 739 * if the offline condition is requested for offline zones. Otherwise, 740 * set the specified zone condition to the zones. Finish the zones 741 * beforehand to free up zone resources. 742 */ 743 if (zone->cond == cond) { 744 zone->cond = BLK_ZONE_COND_EMPTY; 745 zone->wp = zone->start; 746 if (dev->memory_backed) 747 null_handle_discard(dev, zone->start, zone->len); 748 } else { 749 if (zone->cond != BLK_ZONE_COND_READONLY && 750 zone->cond != BLK_ZONE_COND_OFFLINE) 751 null_finish_zone(dev, zone); 752 zone->cond = cond; 753 zone->wp = NULL_ZONE_INVALID_WP; 754 } 755 756 null_unlock_zone(dev, zone); 757 } 758 759 /* 760 * Identify a zone from the sector written to configfs file. Then set zone 761 * condition to the zone. 762 */ 763 ssize_t zone_cond_store(struct nullb_device *dev, const char *page, 764 size_t count, enum blk_zone_cond cond) 765 { 766 unsigned long long sector; 767 unsigned int zone_no; 768 int ret; 769 770 if (!dev->zoned) { 771 pr_err("null_blk device is not zoned\n"); 772 return -EINVAL; 773 } 774 775 if (!dev->zones) { 776 pr_err("null_blk device is not yet powered\n"); 777 return -EINVAL; 778 } 779 780 ret = kstrtoull(page, 0, §or); 781 if (ret < 0) 782 return ret; 783 784 zone_no = null_zone_no(dev, sector); 785 if (zone_no >= dev->nr_zones) { 786 pr_err("Sector out of range\n"); 787 return -EINVAL; 788 } 789 790 if (dev->zones[zone_no].type == BLK_ZONE_TYPE_CONVENTIONAL) { 791 pr_err("Can not change condition of conventional zones\n"); 792 return -EINVAL; 793 } 794 795 null_set_zone_cond(dev, &dev->zones[zone_no], cond); 796 797 return count; 798 } 799