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->features |= BLK_FEAT_ZONED | BLK_FEAT_ZONE_RESETALL; 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 pr_info("%s: using %s zone append\n", 175 disk->disk_name, 176 queue_emulates_zone_append(q) ? "emulated" : "native"); 177 178 return blk_revalidate_disk_zones(disk); 179 } 180 181 void null_free_zoned_dev(struct nullb_device *dev) 182 { 183 kvfree(dev->zones); 184 dev->zones = NULL; 185 } 186 187 int null_report_zones(struct gendisk *disk, sector_t sector, 188 unsigned int nr_zones, report_zones_cb cb, void *data) 189 { 190 struct nullb *nullb = disk->private_data; 191 struct nullb_device *dev = nullb->dev; 192 unsigned int first_zone, i; 193 struct nullb_zone *zone; 194 struct blk_zone blkz; 195 int error; 196 197 first_zone = null_zone_no(dev, sector); 198 if (first_zone >= dev->nr_zones) 199 return 0; 200 201 nr_zones = min(nr_zones, dev->nr_zones - first_zone); 202 trace_nullb_report_zones(nullb, nr_zones); 203 204 memset(&blkz, 0, sizeof(struct blk_zone)); 205 zone = &dev->zones[first_zone]; 206 for (i = 0; i < nr_zones; i++, zone++) { 207 /* 208 * Stacked DM target drivers will remap the zone information by 209 * modifying the zone information passed to the report callback. 210 * So use a local copy to avoid corruption of the device zone 211 * array. 212 */ 213 null_lock_zone(dev, zone); 214 blkz.start = zone->start; 215 blkz.len = zone->len; 216 blkz.wp = zone->wp; 217 blkz.type = zone->type; 218 blkz.cond = zone->cond; 219 blkz.capacity = zone->capacity; 220 null_unlock_zone(dev, zone); 221 222 error = cb(&blkz, i, data); 223 if (error) 224 return error; 225 } 226 227 return nr_zones; 228 } 229 230 /* 231 * This is called in the case of memory backing from null_process_cmd() 232 * with the target zone already locked. 233 */ 234 size_t null_zone_valid_read_len(struct nullb *nullb, 235 sector_t sector, unsigned int len) 236 { 237 struct nullb_device *dev = nullb->dev; 238 struct nullb_zone *zone = &dev->zones[null_zone_no(dev, sector)]; 239 unsigned int nr_sectors = len >> SECTOR_SHIFT; 240 241 /* Read must be below the write pointer position */ 242 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL || 243 sector + nr_sectors <= zone->wp) 244 return len; 245 246 if (sector > zone->wp) 247 return 0; 248 249 return (zone->wp - sector) << SECTOR_SHIFT; 250 } 251 252 static void null_close_imp_open_zone(struct nullb_device *dev) 253 { 254 struct nullb_zone *zone; 255 unsigned int zno, i; 256 257 zno = dev->imp_close_zone_no; 258 if (zno >= dev->nr_zones) 259 zno = dev->zone_nr_conv; 260 261 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { 262 zone = &dev->zones[zno]; 263 zno++; 264 if (zno >= dev->nr_zones) 265 zno = dev->zone_nr_conv; 266 267 if (zone->cond == BLK_ZONE_COND_IMP_OPEN) { 268 dev->nr_zones_imp_open--; 269 if (zone->wp == zone->start) { 270 zone->cond = BLK_ZONE_COND_EMPTY; 271 } else { 272 zone->cond = BLK_ZONE_COND_CLOSED; 273 dev->nr_zones_closed++; 274 } 275 dev->imp_close_zone_no = zno; 276 return; 277 } 278 } 279 } 280 281 static blk_status_t null_check_active(struct nullb_device *dev) 282 { 283 if (!dev->zone_max_active) 284 return BLK_STS_OK; 285 286 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open + 287 dev->nr_zones_closed < dev->zone_max_active) 288 return BLK_STS_OK; 289 290 return BLK_STS_ZONE_ACTIVE_RESOURCE; 291 } 292 293 static blk_status_t null_check_open(struct nullb_device *dev) 294 { 295 if (!dev->zone_max_open) 296 return BLK_STS_OK; 297 298 if (dev->nr_zones_exp_open + dev->nr_zones_imp_open < dev->zone_max_open) 299 return BLK_STS_OK; 300 301 if (dev->nr_zones_imp_open) { 302 if (null_check_active(dev) == BLK_STS_OK) { 303 null_close_imp_open_zone(dev); 304 return BLK_STS_OK; 305 } 306 } 307 308 return BLK_STS_ZONE_OPEN_RESOURCE; 309 } 310 311 /* 312 * This function matches the manage open zone resources function in the ZBC standard, 313 * with the addition of max active zones support (added in the ZNS standard). 314 * 315 * The function determines if a zone can transition to implicit open or explicit open, 316 * while maintaining the max open zone (and max active zone) limit(s). It may close an 317 * implicit open zone in order to make additional zone resources available. 318 * 319 * ZBC states that an implicit open zone shall be closed only if there is not 320 * room within the open limit. However, with the addition of an active limit, 321 * it is not certain that closing an implicit open zone will allow a new zone 322 * to be opened, since we might already be at the active limit capacity. 323 */ 324 static blk_status_t null_check_zone_resources(struct nullb_device *dev, 325 struct nullb_zone *zone) 326 { 327 blk_status_t ret; 328 329 switch (zone->cond) { 330 case BLK_ZONE_COND_EMPTY: 331 ret = null_check_active(dev); 332 if (ret != BLK_STS_OK) 333 return ret; 334 fallthrough; 335 case BLK_ZONE_COND_CLOSED: 336 return null_check_open(dev); 337 default: 338 /* Should never be called for other states */ 339 WARN_ON(1); 340 return BLK_STS_IOERR; 341 } 342 } 343 344 static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector, 345 unsigned int nr_sectors, bool append) 346 { 347 struct nullb_device *dev = cmd->nq->dev; 348 unsigned int zno = null_zone_no(dev, sector); 349 struct nullb_zone *zone = &dev->zones[zno]; 350 blk_status_t ret; 351 352 trace_nullb_zone_op(cmd, zno, zone->cond); 353 354 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) { 355 if (append) 356 return BLK_STS_IOERR; 357 return null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors); 358 } 359 360 null_lock_zone(dev, zone); 361 362 /* 363 * Regular writes must be at the write pointer position. Zone append 364 * writes are automatically issued at the write pointer and the position 365 * returned using the request sector. Note that we do not check the zone 366 * condition because for FULL, READONLY and OFFLINE zones, the sector 367 * check against the zone write pointer will always result in failing 368 * the command. 369 */ 370 if (append) { 371 if (WARN_ON_ONCE(!dev->zone_append_max_sectors) || 372 zone->wp == NULL_ZONE_INVALID_WP) { 373 ret = BLK_STS_IOERR; 374 goto unlock_zone; 375 } 376 sector = zone->wp; 377 blk_mq_rq_from_pdu(cmd)->__sector = sector; 378 } 379 380 if (sector != zone->wp || 381 zone->wp + nr_sectors > zone->start + zone->capacity) { 382 ret = BLK_STS_IOERR; 383 goto unlock_zone; 384 } 385 386 if (zone->cond == BLK_ZONE_COND_CLOSED || 387 zone->cond == BLK_ZONE_COND_EMPTY) { 388 if (dev->need_zone_res_mgmt) { 389 spin_lock(&dev->zone_res_lock); 390 391 ret = null_check_zone_resources(dev, zone); 392 if (ret != BLK_STS_OK) { 393 spin_unlock(&dev->zone_res_lock); 394 goto unlock_zone; 395 } 396 if (zone->cond == BLK_ZONE_COND_CLOSED) { 397 dev->nr_zones_closed--; 398 dev->nr_zones_imp_open++; 399 } else if (zone->cond == BLK_ZONE_COND_EMPTY) { 400 dev->nr_zones_imp_open++; 401 } 402 403 spin_unlock(&dev->zone_res_lock); 404 } 405 406 zone->cond = BLK_ZONE_COND_IMP_OPEN; 407 } 408 409 ret = null_process_cmd(cmd, REQ_OP_WRITE, sector, nr_sectors); 410 if (ret != BLK_STS_OK) 411 goto unlock_zone; 412 413 zone->wp += nr_sectors; 414 if (zone->wp == zone->start + zone->capacity) { 415 if (dev->need_zone_res_mgmt) { 416 spin_lock(&dev->zone_res_lock); 417 if (zone->cond == BLK_ZONE_COND_EXP_OPEN) 418 dev->nr_zones_exp_open--; 419 else if (zone->cond == BLK_ZONE_COND_IMP_OPEN) 420 dev->nr_zones_imp_open--; 421 spin_unlock(&dev->zone_res_lock); 422 } 423 zone->cond = BLK_ZONE_COND_FULL; 424 } 425 426 ret = BLK_STS_OK; 427 428 unlock_zone: 429 null_unlock_zone(dev, zone); 430 431 return ret; 432 } 433 434 static blk_status_t null_open_zone(struct nullb_device *dev, 435 struct nullb_zone *zone) 436 { 437 blk_status_t ret = BLK_STS_OK; 438 439 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) 440 return BLK_STS_IOERR; 441 442 switch (zone->cond) { 443 case BLK_ZONE_COND_EXP_OPEN: 444 /* Open operation on exp open is not an error */ 445 return BLK_STS_OK; 446 case BLK_ZONE_COND_EMPTY: 447 case BLK_ZONE_COND_IMP_OPEN: 448 case BLK_ZONE_COND_CLOSED: 449 break; 450 case BLK_ZONE_COND_FULL: 451 default: 452 return BLK_STS_IOERR; 453 } 454 455 if (dev->need_zone_res_mgmt) { 456 spin_lock(&dev->zone_res_lock); 457 458 switch (zone->cond) { 459 case BLK_ZONE_COND_EMPTY: 460 ret = null_check_zone_resources(dev, zone); 461 if (ret != BLK_STS_OK) { 462 spin_unlock(&dev->zone_res_lock); 463 return ret; 464 } 465 break; 466 case BLK_ZONE_COND_IMP_OPEN: 467 dev->nr_zones_imp_open--; 468 break; 469 case BLK_ZONE_COND_CLOSED: 470 ret = null_check_zone_resources(dev, zone); 471 if (ret != BLK_STS_OK) { 472 spin_unlock(&dev->zone_res_lock); 473 return ret; 474 } 475 dev->nr_zones_closed--; 476 break; 477 default: 478 break; 479 } 480 481 dev->nr_zones_exp_open++; 482 483 spin_unlock(&dev->zone_res_lock); 484 } 485 486 zone->cond = BLK_ZONE_COND_EXP_OPEN; 487 488 return BLK_STS_OK; 489 } 490 491 static blk_status_t null_close_zone(struct nullb_device *dev, 492 struct nullb_zone *zone) 493 { 494 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) 495 return BLK_STS_IOERR; 496 497 switch (zone->cond) { 498 case BLK_ZONE_COND_CLOSED: 499 /* close operation on closed is not an error */ 500 return BLK_STS_OK; 501 case BLK_ZONE_COND_IMP_OPEN: 502 case BLK_ZONE_COND_EXP_OPEN: 503 break; 504 case BLK_ZONE_COND_EMPTY: 505 case BLK_ZONE_COND_FULL: 506 default: 507 return BLK_STS_IOERR; 508 } 509 510 if (dev->need_zone_res_mgmt) { 511 spin_lock(&dev->zone_res_lock); 512 513 switch (zone->cond) { 514 case BLK_ZONE_COND_IMP_OPEN: 515 dev->nr_zones_imp_open--; 516 break; 517 case BLK_ZONE_COND_EXP_OPEN: 518 dev->nr_zones_exp_open--; 519 break; 520 default: 521 break; 522 } 523 524 if (zone->wp > zone->start) 525 dev->nr_zones_closed++; 526 527 spin_unlock(&dev->zone_res_lock); 528 } 529 530 if (zone->wp == zone->start) 531 zone->cond = BLK_ZONE_COND_EMPTY; 532 else 533 zone->cond = BLK_ZONE_COND_CLOSED; 534 535 return BLK_STS_OK; 536 } 537 538 static blk_status_t null_finish_zone(struct nullb_device *dev, 539 struct nullb_zone *zone) 540 { 541 blk_status_t ret = BLK_STS_OK; 542 543 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) 544 return BLK_STS_IOERR; 545 546 if (dev->need_zone_res_mgmt) { 547 spin_lock(&dev->zone_res_lock); 548 549 switch (zone->cond) { 550 case BLK_ZONE_COND_FULL: 551 /* Finish operation on full is not an error */ 552 spin_unlock(&dev->zone_res_lock); 553 return BLK_STS_OK; 554 case BLK_ZONE_COND_EMPTY: 555 ret = null_check_zone_resources(dev, zone); 556 if (ret != BLK_STS_OK) { 557 spin_unlock(&dev->zone_res_lock); 558 return ret; 559 } 560 break; 561 case BLK_ZONE_COND_IMP_OPEN: 562 dev->nr_zones_imp_open--; 563 break; 564 case BLK_ZONE_COND_EXP_OPEN: 565 dev->nr_zones_exp_open--; 566 break; 567 case BLK_ZONE_COND_CLOSED: 568 ret = null_check_zone_resources(dev, zone); 569 if (ret != BLK_STS_OK) { 570 spin_unlock(&dev->zone_res_lock); 571 return ret; 572 } 573 dev->nr_zones_closed--; 574 break; 575 default: 576 spin_unlock(&dev->zone_res_lock); 577 return BLK_STS_IOERR; 578 } 579 580 spin_unlock(&dev->zone_res_lock); 581 } 582 583 zone->cond = BLK_ZONE_COND_FULL; 584 zone->wp = zone->start + zone->len; 585 586 return BLK_STS_OK; 587 } 588 589 static blk_status_t null_reset_zone(struct nullb_device *dev, 590 struct nullb_zone *zone) 591 { 592 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) 593 return BLK_STS_IOERR; 594 595 if (dev->need_zone_res_mgmt) { 596 spin_lock(&dev->zone_res_lock); 597 598 switch (zone->cond) { 599 case BLK_ZONE_COND_IMP_OPEN: 600 dev->nr_zones_imp_open--; 601 break; 602 case BLK_ZONE_COND_EXP_OPEN: 603 dev->nr_zones_exp_open--; 604 break; 605 case BLK_ZONE_COND_CLOSED: 606 dev->nr_zones_closed--; 607 break; 608 case BLK_ZONE_COND_EMPTY: 609 case BLK_ZONE_COND_FULL: 610 break; 611 default: 612 spin_unlock(&dev->zone_res_lock); 613 return BLK_STS_IOERR; 614 } 615 616 spin_unlock(&dev->zone_res_lock); 617 } 618 619 zone->cond = BLK_ZONE_COND_EMPTY; 620 zone->wp = zone->start; 621 622 if (dev->memory_backed) 623 return null_handle_discard(dev, zone->start, zone->len); 624 625 return BLK_STS_OK; 626 } 627 628 static blk_status_t null_zone_mgmt(struct nullb_cmd *cmd, enum req_op op, 629 sector_t sector) 630 { 631 struct nullb_device *dev = cmd->nq->dev; 632 unsigned int zone_no; 633 struct nullb_zone *zone; 634 blk_status_t ret; 635 size_t i; 636 637 if (op == REQ_OP_ZONE_RESET_ALL) { 638 for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) { 639 zone = &dev->zones[i]; 640 null_lock_zone(dev, zone); 641 if (zone->cond != BLK_ZONE_COND_EMPTY && 642 zone->cond != BLK_ZONE_COND_READONLY && 643 zone->cond != BLK_ZONE_COND_OFFLINE) { 644 null_reset_zone(dev, zone); 645 trace_nullb_zone_op(cmd, i, zone->cond); 646 } 647 null_unlock_zone(dev, zone); 648 } 649 return BLK_STS_OK; 650 } 651 652 zone_no = null_zone_no(dev, sector); 653 zone = &dev->zones[zone_no]; 654 655 null_lock_zone(dev, zone); 656 657 if (zone->cond == BLK_ZONE_COND_READONLY || 658 zone->cond == BLK_ZONE_COND_OFFLINE) { 659 ret = BLK_STS_IOERR; 660 goto unlock; 661 } 662 663 switch (op) { 664 case REQ_OP_ZONE_RESET: 665 ret = null_reset_zone(dev, zone); 666 break; 667 case REQ_OP_ZONE_OPEN: 668 ret = null_open_zone(dev, zone); 669 break; 670 case REQ_OP_ZONE_CLOSE: 671 ret = null_close_zone(dev, zone); 672 break; 673 case REQ_OP_ZONE_FINISH: 674 ret = null_finish_zone(dev, zone); 675 break; 676 default: 677 ret = BLK_STS_NOTSUPP; 678 break; 679 } 680 681 if (ret == BLK_STS_OK) 682 trace_nullb_zone_op(cmd, zone_no, zone->cond); 683 684 unlock: 685 null_unlock_zone(dev, zone); 686 687 return ret; 688 } 689 690 blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_op op, 691 sector_t sector, sector_t nr_sectors) 692 { 693 struct nullb_device *dev; 694 struct nullb_zone *zone; 695 blk_status_t sts; 696 697 switch (op) { 698 case REQ_OP_WRITE: 699 return null_zone_write(cmd, sector, nr_sectors, false); 700 case REQ_OP_ZONE_APPEND: 701 return null_zone_write(cmd, sector, nr_sectors, true); 702 case REQ_OP_ZONE_RESET: 703 case REQ_OP_ZONE_RESET_ALL: 704 case REQ_OP_ZONE_OPEN: 705 case REQ_OP_ZONE_CLOSE: 706 case REQ_OP_ZONE_FINISH: 707 return null_zone_mgmt(cmd, op, sector); 708 default: 709 dev = cmd->nq->dev; 710 zone = &dev->zones[null_zone_no(dev, sector)]; 711 if (zone->cond == BLK_ZONE_COND_OFFLINE) 712 return BLK_STS_IOERR; 713 714 null_lock_zone(dev, zone); 715 sts = null_process_cmd(cmd, op, sector, nr_sectors); 716 null_unlock_zone(dev, zone); 717 return sts; 718 } 719 } 720 721 /* 722 * Set a zone in the read-only or offline condition. 723 */ 724 static void null_set_zone_cond(struct nullb_device *dev, 725 struct nullb_zone *zone, enum blk_zone_cond cond) 726 { 727 if (WARN_ON_ONCE(cond != BLK_ZONE_COND_READONLY && 728 cond != BLK_ZONE_COND_OFFLINE)) 729 return; 730 731 null_lock_zone(dev, zone); 732 733 /* 734 * If the read-only condition is requested again to zones already in 735 * read-only condition, restore back normal empty condition. Do the same 736 * if the offline condition is requested for offline zones. Otherwise, 737 * set the specified zone condition to the zones. Finish the zones 738 * beforehand to free up zone resources. 739 */ 740 if (zone->cond == cond) { 741 zone->cond = BLK_ZONE_COND_EMPTY; 742 zone->wp = zone->start; 743 if (dev->memory_backed) 744 null_handle_discard(dev, zone->start, zone->len); 745 } else { 746 if (zone->cond != BLK_ZONE_COND_READONLY && 747 zone->cond != BLK_ZONE_COND_OFFLINE) 748 null_finish_zone(dev, zone); 749 zone->cond = cond; 750 zone->wp = NULL_ZONE_INVALID_WP; 751 } 752 753 null_unlock_zone(dev, zone); 754 } 755 756 /* 757 * Identify a zone from the sector written to configfs file. Then set zone 758 * condition to the zone. 759 */ 760 ssize_t zone_cond_store(struct nullb_device *dev, const char *page, 761 size_t count, enum blk_zone_cond cond) 762 { 763 unsigned long long sector; 764 unsigned int zone_no; 765 int ret; 766 767 if (!dev->zoned) { 768 pr_err("null_blk device is not zoned\n"); 769 return -EINVAL; 770 } 771 772 if (!dev->zones) { 773 pr_err("null_blk device is not yet powered\n"); 774 return -EINVAL; 775 } 776 777 ret = kstrtoull(page, 0, §or); 778 if (ret < 0) 779 return ret; 780 781 zone_no = null_zone_no(dev, sector); 782 if (zone_no >= dev->nr_zones) { 783 pr_err("Sector out of range\n"); 784 return -EINVAL; 785 } 786 787 if (dev->zones[zone_no].type == BLK_ZONE_TYPE_CONVENTIONAL) { 788 pr_err("Can not change condition of conventional zones\n"); 789 return -EINVAL; 790 } 791 792 null_set_zone_cond(dev, &dev->zones[zone_no], cond); 793 794 return count; 795 } 796