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1// SPDX-License-Identifier: GPL-2.02 3#include <linux/bitops.h>4#include <linux/slab.h>5#include <linux/blkdev.h>6#include <linux/sched/mm.h>7#include <linux/atomic.h>8#include <linux/vmalloc.h>9#include "ctree.h"10#include "volumes.h"11#include "zoned.h"12#include "rcu-string.h"13#include "disk-io.h"14#include "block-group.h"15#include "dev-replace.h"16#include "space-info.h"17#include "fs.h"18#include "accessors.h"19#include "bio.h"20 21/* Maximum number of zones to report per blkdev_report_zones() call */22#define BTRFS_REPORT_NR_ZONES 409623/* Invalid allocation pointer value for missing devices */24#define WP_MISSING_DEV ((u64)-1)25/* Pseudo write pointer value for conventional zone */26#define WP_CONVENTIONAL ((u64)-2)27 28/*29 * Location of the first zone of superblock logging zone pairs.30 *31 * - primary superblock: 0B (zone 0)32 * - first copy: 512G (zone starting at that offset)33 * - second copy: 4T (zone starting at that offset)34 */35#define BTRFS_SB_LOG_PRIMARY_OFFSET (0ULL)36#define BTRFS_SB_LOG_FIRST_OFFSET (512ULL * SZ_1G)37#define BTRFS_SB_LOG_SECOND_OFFSET (4096ULL * SZ_1G)38 39#define BTRFS_SB_LOG_FIRST_SHIFT const_ilog2(BTRFS_SB_LOG_FIRST_OFFSET)40#define BTRFS_SB_LOG_SECOND_SHIFT const_ilog2(BTRFS_SB_LOG_SECOND_OFFSET)41 42/* Number of superblock log zones */43#define BTRFS_NR_SB_LOG_ZONES 244 45/*46 * Minimum of active zones we need:47 *48 * - BTRFS_SUPER_MIRROR_MAX zones for superblock mirrors49 * - 3 zones to ensure at least one zone per SYSTEM, META and DATA block group50 * - 1 zone for tree-log dedicated block group51 * - 1 zone for relocation52 */53#define BTRFS_MIN_ACTIVE_ZONES (BTRFS_SUPER_MIRROR_MAX + 5)54 55/*56 * Minimum / maximum supported zone size. Currently, SMR disks have a zone57 * size of 256MiB, and we are expecting ZNS drives to be in the 1-4GiB range.58 * We do not expect the zone size to become larger than 8GiB or smaller than59 * 4MiB in the near future.60 */61#define BTRFS_MAX_ZONE_SIZE SZ_8G62#define BTRFS_MIN_ZONE_SIZE SZ_4M63 64#define SUPER_INFO_SECTORS ((u64)BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT)65 66static void wait_eb_writebacks(struct btrfs_block_group *block_group);67static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written);68 69static inline bool sb_zone_is_full(const struct blk_zone *zone)70{71 return (zone->cond == BLK_ZONE_COND_FULL) ||72 (zone->wp + SUPER_INFO_SECTORS > zone->start + zone->capacity);73}74 75static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data)76{77 struct blk_zone *zones = data;78 79 memcpy(&zones[idx], zone, sizeof(*zone));80 81 return 0;82}83 84static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,85 u64 *wp_ret)86{87 bool empty[BTRFS_NR_SB_LOG_ZONES];88 bool full[BTRFS_NR_SB_LOG_ZONES];89 sector_t sector;90 91 for (int i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {92 ASSERT(zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL);93 empty[i] = (zones[i].cond == BLK_ZONE_COND_EMPTY);94 full[i] = sb_zone_is_full(&zones[i]);95 }96 97 /*98 * Possible states of log buffer zones99 *100 * Empty[0] In use[0] Full[0]101 * Empty[1] * 0 1102 * In use[1] x x 1103 * Full[1] 0 0 C104 *105 * Log position:106 * *: Special case, no superblock is written107 * 0: Use write pointer of zones[0]108 * 1: Use write pointer of zones[1]109 * C: Compare super blocks from zones[0] and zones[1], use the latest110 * one determined by generation111 * x: Invalid state112 */113 114 if (empty[0] && empty[1]) {115 /* Special case to distinguish no superblock to read */116 *wp_ret = zones[0].start << SECTOR_SHIFT;117 return -ENOENT;118 } else if (full[0] && full[1]) {119 /* Compare two super blocks */120 struct address_space *mapping = bdev->bd_mapping;121 struct page *page[BTRFS_NR_SB_LOG_ZONES];122 struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];123 124 for (int i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {125 u64 zone_end = (zones[i].start + zones[i].capacity) << SECTOR_SHIFT;126 u64 bytenr = ALIGN_DOWN(zone_end, BTRFS_SUPER_INFO_SIZE) -127 BTRFS_SUPER_INFO_SIZE;128 129 page[i] = read_cache_page_gfp(mapping,130 bytenr >> PAGE_SHIFT, GFP_NOFS);131 if (IS_ERR(page[i])) {132 if (i == 1)133 btrfs_release_disk_super(super[0]);134 return PTR_ERR(page[i]);135 }136 super[i] = page_address(page[i]);137 }138 139 if (btrfs_super_generation(super[0]) >140 btrfs_super_generation(super[1]))141 sector = zones[1].start;142 else143 sector = zones[0].start;144 145 for (int i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++)146 btrfs_release_disk_super(super[i]);147 } else if (!full[0] && (empty[1] || full[1])) {148 sector = zones[0].wp;149 } else if (full[0]) {150 sector = zones[1].wp;151 } else {152 return -EUCLEAN;153 }154 *wp_ret = sector << SECTOR_SHIFT;155 return 0;156}157 158/*159 * Get the first zone number of the superblock mirror160 */161static inline u32 sb_zone_number(int shift, int mirror)162{163 u64 zone = U64_MAX;164 165 ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);166 switch (mirror) {167 case 0: zone = 0; break;168 case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break;169 case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;170 }171 172 ASSERT(zone <= U32_MAX);173 174 return (u32)zone;175}176 177static inline sector_t zone_start_sector(u32 zone_number,178 struct block_device *bdev)179{180 return (sector_t)zone_number << ilog2(bdev_zone_sectors(bdev));181}182 183static inline u64 zone_start_physical(u32 zone_number,184 struct btrfs_zoned_device_info *zone_info)185{186 return (u64)zone_number << zone_info->zone_size_shift;187}188 189/*190 * Emulate blkdev_report_zones() for a non-zoned device. It slices up the block191 * device into static sized chunks and fake a conventional zone on each of192 * them.193 */194static int emulate_report_zones(struct btrfs_device *device, u64 pos,195 struct blk_zone *zones, unsigned int nr_zones)196{197 const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT;198 sector_t bdev_size = bdev_nr_sectors(device->bdev);199 unsigned int i;200 201 pos >>= SECTOR_SHIFT;202 for (i = 0; i < nr_zones; i++) {203 zones[i].start = i * zone_sectors + pos;204 zones[i].len = zone_sectors;205 zones[i].capacity = zone_sectors;206 zones[i].wp = zones[i].start + zone_sectors;207 zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL;208 zones[i].cond = BLK_ZONE_COND_NOT_WP;209 210 if (zones[i].wp >= bdev_size) {211 i++;212 break;213 }214 }215 216 return i;217}218 219static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,220 struct blk_zone *zones, unsigned int *nr_zones)221{222 struct btrfs_zoned_device_info *zinfo = device->zone_info;223 int ret;224 225 if (!*nr_zones)226 return 0;227 228 if (!bdev_is_zoned(device->bdev)) {229 ret = emulate_report_zones(device, pos, zones, *nr_zones);230 *nr_zones = ret;231 return 0;232 }233 234 /* Check cache */235 if (zinfo->zone_cache) {236 unsigned int i;237 u32 zno;238 239 ASSERT(IS_ALIGNED(pos, zinfo->zone_size));240 zno = pos >> zinfo->zone_size_shift;241 /*242 * We cannot report zones beyond the zone end. So, it is OK to243 * cap *nr_zones to at the end.244 */245 *nr_zones = min_t(u32, *nr_zones, zinfo->nr_zones - zno);246 247 for (i = 0; i < *nr_zones; i++) {248 struct blk_zone *zone_info;249 250 zone_info = &zinfo->zone_cache[zno + i];251 if (!zone_info->len)252 break;253 }254 255 if (i == *nr_zones) {256 /* Cache hit on all the zones */257 memcpy(zones, zinfo->zone_cache + zno,258 sizeof(*zinfo->zone_cache) * *nr_zones);259 return 0;260 }261 }262 263 ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,264 copy_zone_info_cb, zones);265 if (ret < 0) {266 btrfs_err_in_rcu(device->fs_info,267 "zoned: failed to read zone %llu on %s (devid %llu)",268 pos, rcu_str_deref(device->name),269 device->devid);270 return ret;271 }272 *nr_zones = ret;273 if (!ret)274 return -EIO;275 276 /* Populate cache */277 if (zinfo->zone_cache) {278 u32 zno = pos >> zinfo->zone_size_shift;279 280 memcpy(zinfo->zone_cache + zno, zones,281 sizeof(*zinfo->zone_cache) * *nr_zones);282 }283 284 return 0;285}286 287/* The emulated zone size is determined from the size of device extent */288static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info)289{290 BTRFS_PATH_AUTO_FREE(path);291 struct btrfs_root *root = fs_info->dev_root;292 struct btrfs_key key;293 struct extent_buffer *leaf;294 struct btrfs_dev_extent *dext;295 int ret = 0;296 297 key.objectid = 1;298 key.type = BTRFS_DEV_EXTENT_KEY;299 key.offset = 0;300 301 path = btrfs_alloc_path();302 if (!path)303 return -ENOMEM;304 305 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);306 if (ret < 0)307 return ret;308 309 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {310 ret = btrfs_next_leaf(root, path);311 if (ret < 0)312 return ret;313 /* No dev extents at all? Not good */314 if (ret > 0)315 return -EUCLEAN;316 }317 318 leaf = path->nodes[0];319 dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent);320 fs_info->zone_size = btrfs_dev_extent_length(leaf, dext);321 return 0;322}323 324int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)325{326 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;327 struct btrfs_device *device;328 int ret = 0;329 330 /* fs_info->zone_size might not set yet. Use the incomapt flag here. */331 if (!btrfs_fs_incompat(fs_info, ZONED))332 return 0;333 334 mutex_lock(&fs_devices->device_list_mutex);335 list_for_each_entry(device, &fs_devices->devices, dev_list) {336 /* We can skip reading of zone info for missing devices */337 if (!device->bdev)338 continue;339 340 ret = btrfs_get_dev_zone_info(device, true);341 if (ret)342 break;343 }344 mutex_unlock(&fs_devices->device_list_mutex);345 346 return ret;347}348 349int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache)350{351 struct btrfs_fs_info *fs_info = device->fs_info;352 struct btrfs_zoned_device_info *zone_info = NULL;353 struct block_device *bdev = device->bdev;354 unsigned int max_active_zones;355 unsigned int nactive;356 sector_t nr_sectors;357 sector_t sector = 0;358 struct blk_zone *zones = NULL;359 unsigned int i, nreported = 0, nr_zones;360 sector_t zone_sectors;361 char *model, *emulated;362 int ret;363 364 /*365 * Cannot use btrfs_is_zoned here, since fs_info::zone_size might not366 * yet be set.367 */368 if (!btrfs_fs_incompat(fs_info, ZONED))369 return 0;370 371 if (device->zone_info)372 return 0;373 374 zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);375 if (!zone_info)376 return -ENOMEM;377 378 device->zone_info = zone_info;379 380 if (!bdev_is_zoned(bdev)) {381 if (!fs_info->zone_size) {382 ret = calculate_emulated_zone_size(fs_info);383 if (ret)384 goto out;385 }386 387 ASSERT(fs_info->zone_size);388 zone_sectors = fs_info->zone_size >> SECTOR_SHIFT;389 } else {390 zone_sectors = bdev_zone_sectors(bdev);391 }392 393 ASSERT(is_power_of_two_u64(zone_sectors));394 zone_info->zone_size = zone_sectors << SECTOR_SHIFT;395 396 /* We reject devices with a zone size larger than 8GB */397 if (zone_info->zone_size > BTRFS_MAX_ZONE_SIZE) {398 btrfs_err_in_rcu(fs_info,399 "zoned: %s: zone size %llu larger than supported maximum %llu",400 rcu_str_deref(device->name),401 zone_info->zone_size, BTRFS_MAX_ZONE_SIZE);402 ret = -EINVAL;403 goto out;404 } else if (zone_info->zone_size < BTRFS_MIN_ZONE_SIZE) {405 btrfs_err_in_rcu(fs_info,406 "zoned: %s: zone size %llu smaller than supported minimum %u",407 rcu_str_deref(device->name),408 zone_info->zone_size, BTRFS_MIN_ZONE_SIZE);409 ret = -EINVAL;410 goto out;411 }412 413 nr_sectors = bdev_nr_sectors(bdev);414 zone_info->zone_size_shift = ilog2(zone_info->zone_size);415 zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);416 if (!IS_ALIGNED(nr_sectors, zone_sectors))417 zone_info->nr_zones++;418 419 max_active_zones = bdev_max_active_zones(bdev);420 if (max_active_zones && max_active_zones < BTRFS_MIN_ACTIVE_ZONES) {421 btrfs_err_in_rcu(fs_info,422"zoned: %s: max active zones %u is too small, need at least %u active zones",423 rcu_str_deref(device->name), max_active_zones,424 BTRFS_MIN_ACTIVE_ZONES);425 ret = -EINVAL;426 goto out;427 }428 zone_info->max_active_zones = max_active_zones;429 430 zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);431 if (!zone_info->seq_zones) {432 ret = -ENOMEM;433 goto out;434 }435 436 zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);437 if (!zone_info->empty_zones) {438 ret = -ENOMEM;439 goto out;440 }441 442 zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);443 if (!zone_info->active_zones) {444 ret = -ENOMEM;445 goto out;446 }447 448 zones = kvcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);449 if (!zones) {450 ret = -ENOMEM;451 goto out;452 }453 454 /*455 * Enable zone cache only for a zoned device. On a non-zoned device, we456 * fill the zone info with emulated CONVENTIONAL zones, so no need to457 * use the cache.458 */459 if (populate_cache && bdev_is_zoned(device->bdev)) {460 zone_info->zone_cache = vcalloc(zone_info->nr_zones,461 sizeof(struct blk_zone));462 if (!zone_info->zone_cache) {463 btrfs_err_in_rcu(device->fs_info,464 "zoned: failed to allocate zone cache for %s",465 rcu_str_deref(device->name));466 ret = -ENOMEM;467 goto out;468 }469 }470 471 /* Get zones type */472 nactive = 0;473 while (sector < nr_sectors) {474 nr_zones = BTRFS_REPORT_NR_ZONES;475 ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,476 &nr_zones);477 if (ret)478 goto out;479 480 for (i = 0; i < nr_zones; i++) {481 if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)482 __set_bit(nreported, zone_info->seq_zones);483 switch (zones[i].cond) {484 case BLK_ZONE_COND_EMPTY:485 __set_bit(nreported, zone_info->empty_zones);486 break;487 case BLK_ZONE_COND_IMP_OPEN:488 case BLK_ZONE_COND_EXP_OPEN:489 case BLK_ZONE_COND_CLOSED:490 __set_bit(nreported, zone_info->active_zones);491 nactive++;492 break;493 }494 nreported++;495 }496 sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len;497 }498 499 if (nreported != zone_info->nr_zones) {500 btrfs_err_in_rcu(device->fs_info,501 "inconsistent number of zones on %s (%u/%u)",502 rcu_str_deref(device->name), nreported,503 zone_info->nr_zones);504 ret = -EIO;505 goto out;506 }507 508 if (max_active_zones) {509 if (nactive > max_active_zones) {510 btrfs_err_in_rcu(device->fs_info,511 "zoned: %u active zones on %s exceeds max_active_zones %u",512 nactive, rcu_str_deref(device->name),513 max_active_zones);514 ret = -EIO;515 goto out;516 }517 atomic_set(&zone_info->active_zones_left,518 max_active_zones - nactive);519 set_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags);520 }521 522 /* Validate superblock log */523 nr_zones = BTRFS_NR_SB_LOG_ZONES;524 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {525 u32 sb_zone;526 u64 sb_wp;527 int sb_pos = BTRFS_NR_SB_LOG_ZONES * i;528 529 sb_zone = sb_zone_number(zone_info->zone_size_shift, i);530 if (sb_zone + 1 >= zone_info->nr_zones)531 continue;532 533 ret = btrfs_get_dev_zones(device,534 zone_start_physical(sb_zone, zone_info),535 &zone_info->sb_zones[sb_pos],536 &nr_zones);537 if (ret)538 goto out;539 540 if (nr_zones != BTRFS_NR_SB_LOG_ZONES) {541 btrfs_err_in_rcu(device->fs_info,542 "zoned: failed to read super block log zone info at devid %llu zone %u",543 device->devid, sb_zone);544 ret = -EUCLEAN;545 goto out;546 }547 548 /*549 * If zones[0] is conventional, always use the beginning of the550 * zone to record superblock. No need to validate in that case.551 */552 if (zone_info->sb_zones[BTRFS_NR_SB_LOG_ZONES * i].type ==553 BLK_ZONE_TYPE_CONVENTIONAL)554 continue;555 556 ret = sb_write_pointer(device->bdev,557 &zone_info->sb_zones[sb_pos], &sb_wp);558 if (ret != -ENOENT && ret) {559 btrfs_err_in_rcu(device->fs_info,560 "zoned: super block log zone corrupted devid %llu zone %u",561 device->devid, sb_zone);562 ret = -EUCLEAN;563 goto out;564 }565 }566 567 568 kvfree(zones);569 570 if (bdev_is_zoned(bdev)) {571 model = "host-managed zoned";572 emulated = "";573 } else {574 model = "regular";575 emulated = "emulated ";576 }577 578 btrfs_info_in_rcu(fs_info,579 "%s block device %s, %u %szones of %llu bytes",580 model, rcu_str_deref(device->name), zone_info->nr_zones,581 emulated, zone_info->zone_size);582 583 return 0;584 585out:586 kvfree(zones);587 btrfs_destroy_dev_zone_info(device);588 return ret;589}590 591void btrfs_destroy_dev_zone_info(struct btrfs_device *device)592{593 struct btrfs_zoned_device_info *zone_info = device->zone_info;594 595 if (!zone_info)596 return;597 598 bitmap_free(zone_info->active_zones);599 bitmap_free(zone_info->seq_zones);600 bitmap_free(zone_info->empty_zones);601 vfree(zone_info->zone_cache);602 kfree(zone_info);603 device->zone_info = NULL;604}605 606struct btrfs_zoned_device_info *btrfs_clone_dev_zone_info(struct btrfs_device *orig_dev)607{608 struct btrfs_zoned_device_info *zone_info;609 610 zone_info = kmemdup(orig_dev->zone_info, sizeof(*zone_info), GFP_KERNEL);611 if (!zone_info)612 return NULL;613 614 zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);615 if (!zone_info->seq_zones)616 goto out;617 618 bitmap_copy(zone_info->seq_zones, orig_dev->zone_info->seq_zones,619 zone_info->nr_zones);620 621 zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);622 if (!zone_info->empty_zones)623 goto out;624 625 bitmap_copy(zone_info->empty_zones, orig_dev->zone_info->empty_zones,626 zone_info->nr_zones);627 628 zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);629 if (!zone_info->active_zones)630 goto out;631 632 bitmap_copy(zone_info->active_zones, orig_dev->zone_info->active_zones,633 zone_info->nr_zones);634 zone_info->zone_cache = NULL;635 636 return zone_info;637 638out:639 bitmap_free(zone_info->seq_zones);640 bitmap_free(zone_info->empty_zones);641 bitmap_free(zone_info->active_zones);642 kfree(zone_info);643 return NULL;644}645 646static int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos, struct blk_zone *zone)647{648 unsigned int nr_zones = 1;649 int ret;650 651 ret = btrfs_get_dev_zones(device, pos, zone, &nr_zones);652 if (ret != 0 || !nr_zones)653 return ret ? ret : -EIO;654 655 return 0;656}657 658static int btrfs_check_for_zoned_device(struct btrfs_fs_info *fs_info)659{660 struct btrfs_device *device;661 662 list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {663 if (device->bdev && bdev_is_zoned(device->bdev)) {664 btrfs_err(fs_info,665 "zoned: mode not enabled but zoned device found: %pg",666 device->bdev);667 return -EINVAL;668 }669 }670 671 return 0;672}673 674int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)675{676 struct queue_limits *lim = &fs_info->limits;677 struct btrfs_device *device;678 u64 zone_size = 0;679 int ret;680 681 /*682 * Host-Managed devices can't be used without the ZONED flag. With the683 * ZONED all devices can be used, using zone emulation if required.684 */685 if (!btrfs_fs_incompat(fs_info, ZONED))686 return btrfs_check_for_zoned_device(fs_info);687 688 blk_set_stacking_limits(lim);689 690 list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {691 struct btrfs_zoned_device_info *zone_info = device->zone_info;692 693 if (!device->bdev)694 continue;695 696 if (!zone_size) {697 zone_size = zone_info->zone_size;698 } else if (zone_info->zone_size != zone_size) {699 btrfs_err(fs_info,700 "zoned: unequal block device zone sizes: have %llu found %llu",701 zone_info->zone_size, zone_size);702 return -EINVAL;703 }704 705 /*706 * With the zoned emulation, we can have non-zoned device on the707 * zoned mode. In this case, we don't have a valid max zone708 * append size.709 */710 if (bdev_is_zoned(device->bdev)) {711 blk_stack_limits(lim,712 &bdev_get_queue(device->bdev)->limits,713 0);714 }715 }716 717 /*718 * stripe_size is always aligned to BTRFS_STRIPE_LEN in719 * btrfs_create_chunk(). Since we want stripe_len == zone_size,720 * check the alignment here.721 */722 if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) {723 btrfs_err(fs_info,724 "zoned: zone size %llu not aligned to stripe %u",725 zone_size, BTRFS_STRIPE_LEN);726 return -EINVAL;727 }728 729 if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {730 btrfs_err(fs_info, "zoned: mixed block groups not supported");731 return -EINVAL;732 }733 734 fs_info->zone_size = zone_size;735 /*736 * Also limit max_zone_append_size by max_segments * PAGE_SIZE.737 * Technically, we can have multiple pages per segment. But, since738 * we add the pages one by one to a bio, and cannot increase the739 * metadata reservation even if it increases the number of extents, it740 * is safe to stick with the limit.741 */742 fs_info->max_zone_append_size = ALIGN_DOWN(743 min3((u64)lim->max_zone_append_sectors << SECTOR_SHIFT,744 (u64)lim->max_sectors << SECTOR_SHIFT,745 (u64)lim->max_segments << PAGE_SHIFT),746 fs_info->sectorsize);747 fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED;748 if (fs_info->max_zone_append_size < fs_info->max_extent_size)749 fs_info->max_extent_size = fs_info->max_zone_append_size;750 751 /*752 * Check mount options here, because we might change fs_info->zoned753 * from fs_info->zone_size.754 */755 ret = btrfs_check_mountopts_zoned(fs_info, &fs_info->mount_opt);756 if (ret)757 return ret;758 759 btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);760 return 0;761}762 763int btrfs_check_mountopts_zoned(const struct btrfs_fs_info *info,764 unsigned long long *mount_opt)765{766 if (!btrfs_is_zoned(info))767 return 0;768 769 /*770 * Space cache writing is not COWed. Disable that to avoid write errors771 * in sequential zones.772 */773 if (btrfs_raw_test_opt(*mount_opt, SPACE_CACHE)) {774 btrfs_err(info, "zoned: space cache v1 is not supported");775 return -EINVAL;776 }777 778 if (btrfs_raw_test_opt(*mount_opt, NODATACOW)) {779 btrfs_err(info, "zoned: NODATACOW not supported");780 return -EINVAL;781 }782 783 if (btrfs_raw_test_opt(*mount_opt, DISCARD_ASYNC)) {784 btrfs_info(info,785 "zoned: async discard ignored and disabled for zoned mode");786 btrfs_clear_opt(*mount_opt, DISCARD_ASYNC);787 }788 789 return 0;790}791 792static int sb_log_location(struct block_device *bdev, struct blk_zone *zones,793 int rw, u64 *bytenr_ret)794{795 u64 wp;796 int ret;797 798 if (zones[0].type == BLK_ZONE_TYPE_CONVENTIONAL) {799 *bytenr_ret = zones[0].start << SECTOR_SHIFT;800 return 0;801 }802 803 ret = sb_write_pointer(bdev, zones, &wp);804 if (ret != -ENOENT && ret < 0)805 return ret;806 807 if (rw == WRITE) {808 struct blk_zone *reset = NULL;809 810 if (wp == zones[0].start << SECTOR_SHIFT)811 reset = &zones[0];812 else if (wp == zones[1].start << SECTOR_SHIFT)813 reset = &zones[1];814 815 if (reset && reset->cond != BLK_ZONE_COND_EMPTY) {816 unsigned int nofs_flags;817 818 ASSERT(sb_zone_is_full(reset));819 820 nofs_flags = memalloc_nofs_save();821 ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,822 reset->start, reset->len);823 memalloc_nofs_restore(nofs_flags);824 if (ret)825 return ret;826 827 reset->cond = BLK_ZONE_COND_EMPTY;828 reset->wp = reset->start;829 }830 } else if (ret != -ENOENT) {831 /*832 * For READ, we want the previous one. Move write pointer to833 * the end of a zone, if it is at the head of a zone.834 */835 u64 zone_end = 0;836 837 if (wp == zones[0].start << SECTOR_SHIFT)838 zone_end = zones[1].start + zones[1].capacity;839 else if (wp == zones[1].start << SECTOR_SHIFT)840 zone_end = zones[0].start + zones[0].capacity;841 if (zone_end)842 wp = ALIGN_DOWN(zone_end << SECTOR_SHIFT,843 BTRFS_SUPER_INFO_SIZE);844 845 wp -= BTRFS_SUPER_INFO_SIZE;846 }847 848 *bytenr_ret = wp;849 return 0;850 851}852 853int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,854 u64 *bytenr_ret)855{856 struct blk_zone zones[BTRFS_NR_SB_LOG_ZONES];857 sector_t zone_sectors;858 u32 sb_zone;859 int ret;860 u8 zone_sectors_shift;861 sector_t nr_sectors;862 u32 nr_zones;863 864 if (!bdev_is_zoned(bdev)) {865 *bytenr_ret = btrfs_sb_offset(mirror);866 return 0;867 }868 869 ASSERT(rw == READ || rw == WRITE);870 871 zone_sectors = bdev_zone_sectors(bdev);872 if (!is_power_of_2(zone_sectors))873 return -EINVAL;874 zone_sectors_shift = ilog2(zone_sectors);875 nr_sectors = bdev_nr_sectors(bdev);876 nr_zones = nr_sectors >> zone_sectors_shift;877 878 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);879 if (sb_zone + 1 >= nr_zones)880 return -ENOENT;881 882 ret = blkdev_report_zones(bdev, zone_start_sector(sb_zone, bdev),883 BTRFS_NR_SB_LOG_ZONES, copy_zone_info_cb,884 zones);885 if (ret < 0)886 return ret;887 if (ret != BTRFS_NR_SB_LOG_ZONES)888 return -EIO;889 890 return sb_log_location(bdev, zones, rw, bytenr_ret);891}892 893int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,894 u64 *bytenr_ret)895{896 struct btrfs_zoned_device_info *zinfo = device->zone_info;897 u32 zone_num;898 899 /*900 * For a zoned filesystem on a non-zoned block device, use the same901 * super block locations as regular filesystem. Doing so, the super902 * block can always be retrieved and the zoned flag of the volume903 * detected from the super block information.904 */905 if (!bdev_is_zoned(device->bdev)) {906 *bytenr_ret = btrfs_sb_offset(mirror);907 return 0;908 }909 910 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);911 if (zone_num + 1 >= zinfo->nr_zones)912 return -ENOENT;913 914 return sb_log_location(device->bdev,915 &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror],916 rw, bytenr_ret);917}918 919static inline bool is_sb_log_zone(struct btrfs_zoned_device_info *zinfo,920 int mirror)921{922 u32 zone_num;923 924 if (!zinfo)925 return false;926 927 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);928 if (zone_num + 1 >= zinfo->nr_zones)929 return false;930 931 if (!test_bit(zone_num, zinfo->seq_zones))932 return false;933 934 return true;935}936 937int btrfs_advance_sb_log(struct btrfs_device *device, int mirror)938{939 struct btrfs_zoned_device_info *zinfo = device->zone_info;940 struct blk_zone *zone;941 int i;942 943 if (!is_sb_log_zone(zinfo, mirror))944 return 0;945 946 zone = &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror];947 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {948 /* Advance the next zone */949 if (zone->cond == BLK_ZONE_COND_FULL) {950 zone++;951 continue;952 }953 954 if (zone->cond == BLK_ZONE_COND_EMPTY)955 zone->cond = BLK_ZONE_COND_IMP_OPEN;956 957 zone->wp += SUPER_INFO_SECTORS;958 959 if (sb_zone_is_full(zone)) {960 /*961 * No room left to write new superblock. Since962 * superblock is written with REQ_SYNC, it is safe to963 * finish the zone now.964 *965 * If the write pointer is exactly at the capacity,966 * explicit ZONE_FINISH is not necessary.967 */968 if (zone->wp != zone->start + zone->capacity) {969 unsigned int nofs_flags;970 int ret;971 972 nofs_flags = memalloc_nofs_save();973 ret = blkdev_zone_mgmt(device->bdev,974 REQ_OP_ZONE_FINISH, zone->start,975 zone->len);976 memalloc_nofs_restore(nofs_flags);977 if (ret)978 return ret;979 }980 981 zone->wp = zone->start + zone->len;982 zone->cond = BLK_ZONE_COND_FULL;983 }984 return 0;985 }986 987 /* All the zones are FULL. Should not reach here. */988 ASSERT(0);989 return -EIO;990}991 992int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)993{994 unsigned int nofs_flags;995 sector_t zone_sectors;996 sector_t nr_sectors;997 u8 zone_sectors_shift;998 u32 sb_zone;999 u32 nr_zones;1000 int ret;1001 1002 zone_sectors = bdev_zone_sectors(bdev);1003 zone_sectors_shift = ilog2(zone_sectors);1004 nr_sectors = bdev_nr_sectors(bdev);1005 nr_zones = nr_sectors >> zone_sectors_shift;1006 1007 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);1008 if (sb_zone + 1 >= nr_zones)1009 return -ENOENT;1010 1011 nofs_flags = memalloc_nofs_save();1012 ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,1013 zone_start_sector(sb_zone, bdev),1014 zone_sectors * BTRFS_NR_SB_LOG_ZONES);1015 memalloc_nofs_restore(nofs_flags);1016 return ret;1017}1018 1019/*1020 * Find allocatable zones within a given region.1021 *1022 * @device: the device to allocate a region on1023 * @hole_start: the position of the hole to allocate the region1024 * @num_bytes: size of wanted region1025 * @hole_end: the end of the hole1026 * @return: position of allocatable zones1027 *1028 * Allocatable region should not contain any superblock locations.1029 */1030u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,1031 u64 hole_end, u64 num_bytes)1032{1033 struct btrfs_zoned_device_info *zinfo = device->zone_info;1034 const u8 shift = zinfo->zone_size_shift;1035 u64 nzones = num_bytes >> shift;1036 u64 pos = hole_start;1037 u64 begin, end;1038 bool have_sb;1039 int i;1040 1041 ASSERT(IS_ALIGNED(hole_start, zinfo->zone_size));1042 ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size));1043 1044 while (pos < hole_end) {1045 begin = pos >> shift;1046 end = begin + nzones;1047 1048 if (end > zinfo->nr_zones)1049 return hole_end;1050 1051 /* Check if zones in the region are all empty */1052 if (btrfs_dev_is_sequential(device, pos) &&1053 !bitmap_test_range_all_set(zinfo->empty_zones, begin, nzones)) {1054 pos += zinfo->zone_size;1055 continue;1056 }1057 1058 have_sb = false;1059 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {1060 u32 sb_zone;1061 u64 sb_pos;1062 1063 sb_zone = sb_zone_number(shift, i);1064 if (!(end <= sb_zone ||1065 sb_zone + BTRFS_NR_SB_LOG_ZONES <= begin)) {1066 have_sb = true;1067 pos = zone_start_physical(1068 sb_zone + BTRFS_NR_SB_LOG_ZONES, zinfo);1069 break;1070 }1071 1072 /* We also need to exclude regular superblock positions */1073 sb_pos = btrfs_sb_offset(i);1074 if (!(pos + num_bytes <= sb_pos ||1075 sb_pos + BTRFS_SUPER_INFO_SIZE <= pos)) {1076 have_sb = true;1077 pos = ALIGN(sb_pos + BTRFS_SUPER_INFO_SIZE,1078 zinfo->zone_size);1079 break;1080 }1081 }1082 if (!have_sb)1083 break;1084 }1085 1086 return pos;1087}1088 1089static bool btrfs_dev_set_active_zone(struct btrfs_device *device, u64 pos)1090{1091 struct btrfs_zoned_device_info *zone_info = device->zone_info;1092 unsigned int zno = (pos >> zone_info->zone_size_shift);1093 1094 /* We can use any number of zones */1095 if (zone_info->max_active_zones == 0)1096 return true;1097 1098 if (!test_bit(zno, zone_info->active_zones)) {1099 /* Active zone left? */1100 if (atomic_dec_if_positive(&zone_info->active_zones_left) < 0)1101 return false;1102 if (test_and_set_bit(zno, zone_info->active_zones)) {1103 /* Someone already set the bit */1104 atomic_inc(&zone_info->active_zones_left);1105 }1106 }1107 1108 return true;1109}1110 1111static void btrfs_dev_clear_active_zone(struct btrfs_device *device, u64 pos)1112{1113 struct btrfs_zoned_device_info *zone_info = device->zone_info;1114 unsigned int zno = (pos >> zone_info->zone_size_shift);1115 1116 /* We can use any number of zones */1117 if (zone_info->max_active_zones == 0)1118 return;1119 1120 if (test_and_clear_bit(zno, zone_info->active_zones))1121 atomic_inc(&zone_info->active_zones_left);1122}1123 1124int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,1125 u64 length, u64 *bytes)1126{1127 unsigned int nofs_flags;1128 int ret;1129 1130 *bytes = 0;1131 nofs_flags = memalloc_nofs_save();1132 ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_RESET,1133 physical >> SECTOR_SHIFT, length >> SECTOR_SHIFT);1134 memalloc_nofs_restore(nofs_flags);1135 if (ret)1136 return ret;1137 1138 *bytes = length;1139 while (length) {1140 btrfs_dev_set_zone_empty(device, physical);1141 btrfs_dev_clear_active_zone(device, physical);1142 physical += device->zone_info->zone_size;1143 length -= device->zone_info->zone_size;1144 }1145 1146 return 0;1147}1148 1149int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size)1150{1151 struct btrfs_zoned_device_info *zinfo = device->zone_info;1152 const u8 shift = zinfo->zone_size_shift;1153 unsigned long begin = start >> shift;1154 unsigned long nbits = size >> shift;1155 u64 pos;1156 int ret;1157 1158 ASSERT(IS_ALIGNED(start, zinfo->zone_size));1159 ASSERT(IS_ALIGNED(size, zinfo->zone_size));1160 1161 if (begin + nbits > zinfo->nr_zones)1162 return -ERANGE;1163 1164 /* All the zones are conventional */1165 if (bitmap_test_range_all_zero(zinfo->seq_zones, begin, nbits))1166 return 0;1167 1168 /* All the zones are sequential and empty */1169 if (bitmap_test_range_all_set(zinfo->seq_zones, begin, nbits) &&1170 bitmap_test_range_all_set(zinfo->empty_zones, begin, nbits))1171 return 0;1172 1173 for (pos = start; pos < start + size; pos += zinfo->zone_size) {1174 u64 reset_bytes;1175 1176 if (!btrfs_dev_is_sequential(device, pos) ||1177 btrfs_dev_is_empty_zone(device, pos))1178 continue;1179 1180 /* Free regions should be empty */1181 btrfs_warn_in_rcu(1182 device->fs_info,1183 "zoned: resetting device %s (devid %llu) zone %llu for allocation",1184 rcu_str_deref(device->name), device->devid, pos >> shift);1185 WARN_ON_ONCE(1);1186 1187 ret = btrfs_reset_device_zone(device, pos, zinfo->zone_size,1188 &reset_bytes);1189 if (ret)1190 return ret;1191 }1192 1193 return 0;1194}1195 1196/*1197 * Calculate an allocation pointer from the extent allocation information1198 * for a block group consist of conventional zones. It is pointed to the1199 * end of the highest addressed extent in the block group as an allocation1200 * offset.1201 */1202static int calculate_alloc_pointer(struct btrfs_block_group *cache,1203 u64 *offset_ret, bool new)1204{1205 struct btrfs_fs_info *fs_info = cache->fs_info;1206 struct btrfs_root *root;1207 BTRFS_PATH_AUTO_FREE(path);1208 struct btrfs_key key;1209 struct btrfs_key found_key;1210 int ret;1211 u64 length;1212 1213 /*1214 * Avoid tree lookups for a new block group, there's no use for it.1215 * It must always be 0.1216 *1217 * Also, we have a lock chain of extent buffer lock -> chunk mutex.1218 * For new a block group, this function is called from1219 * btrfs_make_block_group() which is already taking the chunk mutex.1220 * Thus, we cannot call calculate_alloc_pointer() which takes extent1221 * buffer locks to avoid deadlock.1222 */1223 if (new) {1224 *offset_ret = 0;1225 return 0;1226 }1227 1228 path = btrfs_alloc_path();1229 if (!path)1230 return -ENOMEM;1231 1232 key.objectid = cache->start + cache->length;1233 key.type = 0;1234 key.offset = 0;1235 1236 root = btrfs_extent_root(fs_info, key.objectid);1237 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);1238 /* We should not find the exact match */1239 if (!ret)1240 ret = -EUCLEAN;1241 if (ret < 0)1242 return ret;1243 1244 ret = btrfs_previous_extent_item(root, path, cache->start);1245 if (ret) {1246 if (ret == 1) {1247 ret = 0;1248 *offset_ret = 0;1249 }1250 return ret;1251 }1252 1253 btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);1254 1255 if (found_key.type == BTRFS_EXTENT_ITEM_KEY)1256 length = found_key.offset;1257 else1258 length = fs_info->nodesize;1259 1260 if (!(found_key.objectid >= cache->start &&1261 found_key.objectid + length <= cache->start + cache->length)) {1262 return -EUCLEAN;1263 }1264 *offset_ret = found_key.objectid + length - cache->start;1265 return 0;1266}1267 1268struct zone_info {1269 u64 physical;1270 u64 capacity;1271 u64 alloc_offset;1272};1273 1274static int btrfs_load_zone_info(struct btrfs_fs_info *fs_info, int zone_idx,1275 struct zone_info *info, unsigned long *active,1276 struct btrfs_chunk_map *map)1277{1278 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;1279 struct btrfs_device *device;1280 int dev_replace_is_ongoing = 0;1281 unsigned int nofs_flag;1282 struct blk_zone zone;1283 int ret;1284 1285 info->physical = map->stripes[zone_idx].physical;1286 1287 down_read(&dev_replace->rwsem);1288 device = map->stripes[zone_idx].dev;1289 1290 if (!device->bdev) {1291 up_read(&dev_replace->rwsem);1292 info->alloc_offset = WP_MISSING_DEV;1293 return 0;1294 }1295 1296 /* Consider a zone as active if we can allow any number of active zones. */1297 if (!device->zone_info->max_active_zones)1298 __set_bit(zone_idx, active);1299 1300 if (!btrfs_dev_is_sequential(device, info->physical)) {1301 up_read(&dev_replace->rwsem);1302 info->alloc_offset = WP_CONVENTIONAL;1303 return 0;1304 }1305 1306 /* This zone will be used for allocation, so mark this zone non-empty. */1307 btrfs_dev_clear_zone_empty(device, info->physical);1308 1309 dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);1310 if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL)1311 btrfs_dev_clear_zone_empty(dev_replace->tgtdev, info->physical);1312 1313 /*1314 * The group is mapped to a sequential zone. Get the zone write pointer1315 * to determine the allocation offset within the zone.1316 */1317 WARN_ON(!IS_ALIGNED(info->physical, fs_info->zone_size));1318 nofs_flag = memalloc_nofs_save();1319 ret = btrfs_get_dev_zone(device, info->physical, &zone);1320 memalloc_nofs_restore(nofs_flag);1321 if (ret) {1322 up_read(&dev_replace->rwsem);1323 if (ret != -EIO && ret != -EOPNOTSUPP)1324 return ret;1325 info->alloc_offset = WP_MISSING_DEV;1326 return 0;1327 }1328 1329 if (zone.type == BLK_ZONE_TYPE_CONVENTIONAL) {1330 btrfs_err_in_rcu(fs_info,1331 "zoned: unexpected conventional zone %llu on device %s (devid %llu)",1332 zone.start << SECTOR_SHIFT, rcu_str_deref(device->name),1333 device->devid);1334 up_read(&dev_replace->rwsem);1335 return -EIO;1336 }1337 1338 info->capacity = (zone.capacity << SECTOR_SHIFT);1339 1340 switch (zone.cond) {1341 case BLK_ZONE_COND_OFFLINE:1342 case BLK_ZONE_COND_READONLY:1343 btrfs_err_in_rcu(fs_info,1344 "zoned: offline/readonly zone %llu on device %s (devid %llu)",1345 (info->physical >> device->zone_info->zone_size_shift),1346 rcu_str_deref(device->name), device->devid);1347 info->alloc_offset = WP_MISSING_DEV;1348 break;1349 case BLK_ZONE_COND_EMPTY:1350 info->alloc_offset = 0;1351 break;1352 case BLK_ZONE_COND_FULL:1353 info->alloc_offset = info->capacity;1354 break;1355 default:1356 /* Partially used zone. */1357 info->alloc_offset = ((zone.wp - zone.start) << SECTOR_SHIFT);1358 __set_bit(zone_idx, active);1359 break;1360 }1361 1362 up_read(&dev_replace->rwsem);1363 1364 return 0;1365}1366 1367static int btrfs_load_block_group_single(struct btrfs_block_group *bg,1368 struct zone_info *info,1369 unsigned long *active)1370{1371 if (info->alloc_offset == WP_MISSING_DEV) {1372 btrfs_err(bg->fs_info,1373 "zoned: cannot recover write pointer for zone %llu",1374 info->physical);1375 return -EIO;1376 }1377 1378 bg->alloc_offset = info->alloc_offset;1379 bg->zone_capacity = info->capacity;1380 if (test_bit(0, active))1381 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);1382 return 0;1383}1384 1385static int btrfs_load_block_group_dup(struct btrfs_block_group *bg,1386 struct btrfs_chunk_map *map,1387 struct zone_info *zone_info,1388 unsigned long *active)1389{1390 struct btrfs_fs_info *fs_info = bg->fs_info;1391 1392 if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {1393 btrfs_err(fs_info, "zoned: data DUP profile needs raid-stripe-tree");1394 return -EINVAL;1395 }1396 1397 bg->zone_capacity = min_not_zero(zone_info[0].capacity, zone_info[1].capacity);1398 1399 if (zone_info[0].alloc_offset == WP_MISSING_DEV) {1400 btrfs_err(bg->fs_info,1401 "zoned: cannot recover write pointer for zone %llu",1402 zone_info[0].physical);1403 return -EIO;1404 }1405 if (zone_info[1].alloc_offset == WP_MISSING_DEV) {1406 btrfs_err(bg->fs_info,1407 "zoned: cannot recover write pointer for zone %llu",1408 zone_info[1].physical);1409 return -EIO;1410 }1411 if (zone_info[0].alloc_offset != zone_info[1].alloc_offset) {1412 btrfs_err(bg->fs_info,1413 "zoned: write pointer offset mismatch of zones in DUP profile");1414 return -EIO;1415 }1416 1417 if (test_bit(0, active) != test_bit(1, active)) {1418 if (!btrfs_zone_activate(bg))1419 return -EIO;1420 } else if (test_bit(0, active)) {1421 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);1422 }1423 1424 bg->alloc_offset = zone_info[0].alloc_offset;1425 return 0;1426}1427 1428static int btrfs_load_block_group_raid1(struct btrfs_block_group *bg,1429 struct btrfs_chunk_map *map,1430 struct zone_info *zone_info,1431 unsigned long *active)1432{1433 struct btrfs_fs_info *fs_info = bg->fs_info;1434 int i;1435 1436 if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {1437 btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",1438 btrfs_bg_type_to_raid_name(map->type));1439 return -EINVAL;1440 }1441 1442 /* In case a device is missing we have a cap of 0, so don't use it. */1443 bg->zone_capacity = min_not_zero(zone_info[0].capacity, zone_info[1].capacity);1444 1445 for (i = 0; i < map->num_stripes; i++) {1446 if (zone_info[i].alloc_offset == WP_MISSING_DEV ||1447 zone_info[i].alloc_offset == WP_CONVENTIONAL)1448 continue;1449 1450 if ((zone_info[0].alloc_offset != zone_info[i].alloc_offset) &&1451 !btrfs_test_opt(fs_info, DEGRADED)) {1452 btrfs_err(fs_info,1453 "zoned: write pointer offset mismatch of zones in %s profile",1454 btrfs_bg_type_to_raid_name(map->type));1455 return -EIO;1456 }1457 if (test_bit(0, active) != test_bit(i, active)) {1458 if (!btrfs_test_opt(fs_info, DEGRADED) &&1459 !btrfs_zone_activate(bg)) {1460 return -EIO;1461 }1462 } else {1463 if (test_bit(0, active))1464 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);1465 }1466 }1467 1468 if (zone_info[0].alloc_offset != WP_MISSING_DEV)1469 bg->alloc_offset = zone_info[0].alloc_offset;1470 else1471 bg->alloc_offset = zone_info[i - 1].alloc_offset;1472 1473 return 0;1474}1475 1476static int btrfs_load_block_group_raid0(struct btrfs_block_group *bg,1477 struct btrfs_chunk_map *map,1478 struct zone_info *zone_info,1479 unsigned long *active)1480{1481 struct btrfs_fs_info *fs_info = bg->fs_info;1482 1483 if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {1484 btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",1485 btrfs_bg_type_to_raid_name(map->type));1486 return -EINVAL;1487 }1488 1489 for (int i = 0; i < map->num_stripes; i++) {1490 if (zone_info[i].alloc_offset == WP_MISSING_DEV ||1491 zone_info[i].alloc_offset == WP_CONVENTIONAL)1492 continue;1493 1494 if (test_bit(0, active) != test_bit(i, active)) {1495 if (!btrfs_zone_activate(bg))1496 return -EIO;1497 } else {1498 if (test_bit(0, active))1499 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);1500 }1501 bg->zone_capacity += zone_info[i].capacity;1502 bg->alloc_offset += zone_info[i].alloc_offset;1503 }1504 1505 return 0;1506}1507 1508static int btrfs_load_block_group_raid10(struct btrfs_block_group *bg,1509 struct btrfs_chunk_map *map,1510 struct zone_info *zone_info,1511 unsigned long *active)1512{1513 struct btrfs_fs_info *fs_info = bg->fs_info;1514 1515 if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {1516 btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",1517 btrfs_bg_type_to_raid_name(map->type));1518 return -EINVAL;1519 }1520 1521 for (int i = 0; i < map->num_stripes; i++) {1522 if (zone_info[i].alloc_offset == WP_MISSING_DEV ||1523 zone_info[i].alloc_offset == WP_CONVENTIONAL)1524 continue;1525 1526 if (test_bit(0, active) != test_bit(i, active)) {1527 if (!btrfs_zone_activate(bg))1528 return -EIO;1529 } else {1530 if (test_bit(0, active))1531 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);1532 }1533 1534 if ((i % map->sub_stripes) == 0) {1535 bg->zone_capacity += zone_info[i].capacity;1536 bg->alloc_offset += zone_info[i].alloc_offset;1537 }1538 }1539 1540 return 0;1541}1542 1543int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)1544{1545 struct btrfs_fs_info *fs_info = cache->fs_info;1546 struct btrfs_chunk_map *map;1547 u64 logical = cache->start;1548 u64 length = cache->length;1549 struct zone_info *zone_info = NULL;1550 int ret;1551 int i;1552 unsigned long *active = NULL;1553 u64 last_alloc = 0;1554 u32 num_sequential = 0, num_conventional = 0;1555 u64 profile;1556 1557 if (!btrfs_is_zoned(fs_info))1558 return 0;1559 1560 /* Sanity check */1561 if (!IS_ALIGNED(length, fs_info->zone_size)) {1562 btrfs_err(fs_info,1563 "zoned: block group %llu len %llu unaligned to zone size %llu",1564 logical, length, fs_info->zone_size);1565 return -EIO;1566 }1567 1568 map = btrfs_find_chunk_map(fs_info, logical, length);1569 if (!map)1570 return -EINVAL;1571 1572 cache->physical_map = map;1573 1574 zone_info = kcalloc(map->num_stripes, sizeof(*zone_info), GFP_NOFS);1575 if (!zone_info) {1576 ret = -ENOMEM;1577 goto out;1578 }1579 1580 active = bitmap_zalloc(map->num_stripes, GFP_NOFS);1581 if (!active) {1582 ret = -ENOMEM;1583 goto out;1584 }1585 1586 for (i = 0; i < map->num_stripes; i++) {1587 ret = btrfs_load_zone_info(fs_info, i, &zone_info[i], active, map);1588 if (ret)1589 goto out;1590 1591 if (zone_info[i].alloc_offset == WP_CONVENTIONAL)1592 num_conventional++;1593 else1594 num_sequential++;1595 }1596 1597 if (num_sequential > 0)1598 set_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags);1599 1600 if (num_conventional > 0) {1601 /* Zone capacity is always zone size in emulation */1602 cache->zone_capacity = cache->length;1603 ret = calculate_alloc_pointer(cache, &last_alloc, new);1604 if (ret) {1605 btrfs_err(fs_info,1606 "zoned: failed to determine allocation offset of bg %llu",1607 cache->start);1608 goto out;1609 } else if (map->num_stripes == num_conventional) {1610 cache->alloc_offset = last_alloc;1611 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags);1612 goto out;1613 }1614 }1615 1616 profile = map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK;1617 switch (profile) {1618 case 0: /* single */1619 ret = btrfs_load_block_group_single(cache, &zone_info[0], active);1620 break;1621 case BTRFS_BLOCK_GROUP_DUP:1622 ret = btrfs_load_block_group_dup(cache, map, zone_info, active);1623 break;1624 case BTRFS_BLOCK_GROUP_RAID1:1625 case BTRFS_BLOCK_GROUP_RAID1C3:1626 case BTRFS_BLOCK_GROUP_RAID1C4:1627 ret = btrfs_load_block_group_raid1(cache, map, zone_info, active);1628 break;1629 case BTRFS_BLOCK_GROUP_RAID0:1630 ret = btrfs_load_block_group_raid0(cache, map, zone_info, active);1631 break;1632 case BTRFS_BLOCK_GROUP_RAID10:1633 ret = btrfs_load_block_group_raid10(cache, map, zone_info, active);1634 break;1635 case BTRFS_BLOCK_GROUP_RAID5:1636 case BTRFS_BLOCK_GROUP_RAID6:1637 default:1638 btrfs_err(fs_info, "zoned: profile %s not yet supported",1639 btrfs_bg_type_to_raid_name(map->type));1640 ret = -EINVAL;1641 goto out;1642 }1643 1644 if (ret == -EIO && profile != 0 && profile != BTRFS_BLOCK_GROUP_RAID0 &&1645 profile != BTRFS_BLOCK_GROUP_RAID10) {1646 /*1647 * Detected broken write pointer. Make this block group1648 * unallocatable by setting the allocation pointer at the end of1649 * allocatable region. Relocating this block group will fix the1650 * mismatch.1651 *1652 * Currently, we cannot handle RAID0 or RAID10 case like this1653 * because we don't have a proper zone_capacity value. But,1654 * reading from this block group won't work anyway by a missing1655 * stripe.1656 */1657 cache->alloc_offset = cache->zone_capacity;1658 ret = 0;1659 }1660 1661out:1662 /* Reject non SINGLE data profiles without RST */1663 if ((map->type & BTRFS_BLOCK_GROUP_DATA) &&1664 (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) &&1665 !fs_info->stripe_root) {1666 btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",1667 btrfs_bg_type_to_raid_name(map->type));1668 return -EINVAL;1669 }1670 1671 if (cache->alloc_offset > cache->zone_capacity) {1672 btrfs_err(fs_info,1673"zoned: invalid write pointer %llu (larger than zone capacity %llu) in block group %llu",1674 cache->alloc_offset, cache->zone_capacity,1675 cache->start);1676 ret = -EIO;1677 }1678 1679 /* An extent is allocated after the write pointer */1680 if (!ret && num_conventional && last_alloc > cache->alloc_offset) {1681 btrfs_err(fs_info,1682 "zoned: got wrong write pointer in BG %llu: %llu > %llu",1683 logical, last_alloc, cache->alloc_offset);1684 ret = -EIO;1685 }1686 1687 if (!ret) {1688 cache->meta_write_pointer = cache->alloc_offset + cache->start;1689 if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags)) {1690 btrfs_get_block_group(cache);1691 spin_lock(&fs_info->zone_active_bgs_lock);1692 list_add_tail(&cache->active_bg_list,1693 &fs_info->zone_active_bgs);1694 spin_unlock(&fs_info->zone_active_bgs_lock);1695 }1696 } else {1697 btrfs_free_chunk_map(cache->physical_map);1698 cache->physical_map = NULL;1699 }1700 bitmap_free(active);1701 kfree(zone_info);1702 1703 return ret;1704}1705 1706void btrfs_calc_zone_unusable(struct btrfs_block_group *cache)1707{1708 u64 unusable, free;1709 1710 if (!btrfs_is_zoned(cache->fs_info))1711 return;1712 1713 WARN_ON(cache->bytes_super != 0);1714 unusable = (cache->alloc_offset - cache->used) +1715 (cache->length - cache->zone_capacity);1716 free = cache->zone_capacity - cache->alloc_offset;1717 1718 /* We only need ->free_space in ALLOC_SEQ block groups */1719 cache->cached = BTRFS_CACHE_FINISHED;1720 cache->free_space_ctl->free_space = free;1721 cache->zone_unusable = unusable;1722}1723 1724bool btrfs_use_zone_append(struct btrfs_bio *bbio)1725{1726 u64 start = (bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT);1727 struct btrfs_inode *inode = bbio->inode;1728 struct btrfs_fs_info *fs_info = bbio->fs_info;1729 struct btrfs_block_group *cache;1730 bool ret = false;1731 1732 if (!btrfs_is_zoned(fs_info))1733 return false;1734 1735 if (!inode || !is_data_inode(inode))1736 return false;1737 1738 if (btrfs_op(&bbio->bio) != BTRFS_MAP_WRITE)1739 return false;1740 1741 /*1742 * Using REQ_OP_ZONE_APPNED for relocation can break assumptions on the1743 * extent layout the relocation code has.1744 * Furthermore we have set aside own block-group from which only the1745 * relocation "process" can allocate and make sure only one process at a1746 * time can add pages to an extent that gets relocated, so it's safe to1747 * use regular REQ_OP_WRITE for this special case.1748 */1749 if (btrfs_is_data_reloc_root(inode->root))1750 return false;1751 1752 cache = btrfs_lookup_block_group(fs_info, start);1753 ASSERT(cache);1754 if (!cache)1755 return false;1756 1757 ret = !!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags);1758 btrfs_put_block_group(cache);1759 1760 return ret;1761}1762 1763void btrfs_record_physical_zoned(struct btrfs_bio *bbio)1764{1765 const u64 physical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT;1766 struct btrfs_ordered_sum *sum = bbio->sums;1767 1768 if (physical < bbio->orig_physical)1769 sum->logical -= bbio->orig_physical - physical;1770 else1771 sum->logical += physical - bbio->orig_physical;1772}1773 1774static void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered,1775 u64 logical)1776{1777 struct extent_map_tree *em_tree = &ordered->inode->extent_tree;1778 struct extent_map *em;1779 1780 ordered->disk_bytenr = logical;1781 1782 write_lock(&em_tree->lock);1783 em = search_extent_mapping(em_tree, ordered->file_offset,1784 ordered->num_bytes);1785 /* The em should be a new COW extent, thus it should not have an offset. */1786 ASSERT(em->offset == 0);1787 em->disk_bytenr = logical;1788 free_extent_map(em);1789 write_unlock(&em_tree->lock);1790}1791 1792static bool btrfs_zoned_split_ordered(struct btrfs_ordered_extent *ordered,1793 u64 logical, u64 len)1794{1795 struct btrfs_ordered_extent *new;1796 1797 if (!test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags) &&1798 split_extent_map(ordered->inode, ordered->file_offset,1799 ordered->num_bytes, len, logical))1800 return false;1801 1802 new = btrfs_split_ordered_extent(ordered, len);1803 if (IS_ERR(new))1804 return false;1805 new->disk_bytenr = logical;1806 btrfs_finish_one_ordered(new);1807 return true;1808}1809 1810void btrfs_finish_ordered_zoned(struct btrfs_ordered_extent *ordered)1811{1812 struct btrfs_inode *inode = ordered->inode;1813 struct btrfs_fs_info *fs_info = inode->root->fs_info;1814 struct btrfs_ordered_sum *sum;1815 u64 logical, len;1816 1817 /*1818 * Write to pre-allocated region is for the data relocation, and so1819 * it should use WRITE operation. No split/rewrite are necessary.1820 */1821 if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags))1822 return;1823 1824 ASSERT(!list_empty(&ordered->list));1825 /* The ordered->list can be empty in the above pre-alloc case. */1826 sum = list_first_entry(&ordered->list, struct btrfs_ordered_sum, list);1827 logical = sum->logical;1828 len = sum->len;1829 1830 while (len < ordered->disk_num_bytes) {1831 sum = list_next_entry(sum, list);1832 if (sum->logical == logical + len) {1833 len += sum->len;1834 continue;1835 }1836 if (!btrfs_zoned_split_ordered(ordered, logical, len)) {1837 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);1838 btrfs_err(fs_info, "failed to split ordered extent");1839 goto out;1840 }1841 logical = sum->logical;1842 len = sum->len;1843 }1844 1845 if (ordered->disk_bytenr != logical)1846 btrfs_rewrite_logical_zoned(ordered, logical);1847 1848out:1849 /*1850 * If we end up here for nodatasum I/O, the btrfs_ordered_sum structures1851 * were allocated by btrfs_alloc_dummy_sum only to record the logical1852 * addresses and don't contain actual checksums. We thus must free them1853 * here so that we don't attempt to log the csums later.1854 */1855 if ((inode->flags & BTRFS_INODE_NODATASUM) ||1856 test_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state)) {1857 while ((sum = list_first_entry_or_null(&ordered->list,1858 typeof(*sum), list))) {1859 list_del(&sum->list);1860 kfree(sum);1861 }1862 }1863}1864 1865static bool check_bg_is_active(struct btrfs_eb_write_context *ctx,1866 struct btrfs_block_group **active_bg)1867{1868 const struct writeback_control *wbc = ctx->wbc;1869 struct btrfs_block_group *block_group = ctx->zoned_bg;1870 struct btrfs_fs_info *fs_info = block_group->fs_info;1871 1872 if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags))1873 return true;1874 1875 if (fs_info->treelog_bg == block_group->start) {1876 if (!btrfs_zone_activate(block_group)) {1877 int ret_fin = btrfs_zone_finish_one_bg(fs_info);1878 1879 if (ret_fin != 1 || !btrfs_zone_activate(block_group))1880 return false;1881 }1882 } else if (*active_bg != block_group) {1883 struct btrfs_block_group *tgt = *active_bg;1884 1885 /* zoned_meta_io_lock protects fs_info->active_{meta,system}_bg. */1886 lockdep_assert_held(&fs_info->zoned_meta_io_lock);1887 1888 if (tgt) {1889 /*1890 * If there is an unsent IO left in the allocated area,1891 * we cannot wait for them as it may cause a deadlock.1892 */1893 if (tgt->meta_write_pointer < tgt->start + tgt->alloc_offset) {1894 if (wbc->sync_mode == WB_SYNC_NONE ||1895 (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync))1896 return false;1897 }1898 1899 /* Pivot active metadata/system block group. */1900 btrfs_zoned_meta_io_unlock(fs_info);1901 wait_eb_writebacks(tgt);1902 do_zone_finish(tgt, true);1903 btrfs_zoned_meta_io_lock(fs_info);1904 if (*active_bg == tgt) {1905 btrfs_put_block_group(tgt);1906 *active_bg = NULL;1907 }1908 }1909 if (!btrfs_zone_activate(block_group))1910 return false;1911 if (*active_bg != block_group) {1912 ASSERT(*active_bg == NULL);1913 *active_bg = block_group;1914 btrfs_get_block_group(block_group);1915 }1916 }1917 1918 return true;1919}1920 1921/*1922 * Check if @ctx->eb is aligned to the write pointer.1923 *1924 * Return:1925 * 0: @ctx->eb is at the write pointer. You can write it.1926 * -EAGAIN: There is a hole. The caller should handle the case.1927 * -EBUSY: There is a hole, but the caller can just bail out.1928 */1929int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,1930 struct btrfs_eb_write_context *ctx)1931{1932 const struct writeback_control *wbc = ctx->wbc;1933 const struct extent_buffer *eb = ctx->eb;1934 struct btrfs_block_group *block_group = ctx->zoned_bg;1935 1936 if (!btrfs_is_zoned(fs_info))1937 return 0;1938 1939 if (block_group) {1940 if (block_group->start > eb->start ||1941 block_group->start + block_group->length <= eb->start) {1942 btrfs_put_block_group(block_group);1943 block_group = NULL;1944 ctx->zoned_bg = NULL;1945 }1946 }1947 1948 if (!block_group) {1949 block_group = btrfs_lookup_block_group(fs_info, eb->start);1950 if (!block_group)1951 return 0;1952 ctx->zoned_bg = block_group;1953 }1954 1955 if (block_group->meta_write_pointer == eb->start) {1956 struct btrfs_block_group **tgt;1957 1958 if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags))1959 return 0;1960 1961 if (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM)1962 tgt = &fs_info->active_system_bg;1963 else1964 tgt = &fs_info->active_meta_bg;1965 if (check_bg_is_active(ctx, tgt))1966 return 0;1967 }1968 1969 /*1970 * Since we may release fs_info->zoned_meta_io_lock, someone can already1971 * start writing this eb. In that case, we can just bail out.1972 */1973 if (block_group->meta_write_pointer > eb->start)1974 return -EBUSY;1975 1976 /* If for_sync, this hole will be filled with trasnsaction commit. */1977 if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)1978 return -EAGAIN;1979 return -EBUSY;1980}1981 1982int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length)1983{1984 if (!btrfs_dev_is_sequential(device, physical))1985 return -EOPNOTSUPP;1986 1987 return blkdev_issue_zeroout(device->bdev, physical >> SECTOR_SHIFT,1988 length >> SECTOR_SHIFT, GFP_NOFS, 0);1989}1990 1991static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical,1992 struct blk_zone *zone)1993{1994 struct btrfs_io_context *bioc = NULL;1995 u64 mapped_length = PAGE_SIZE;1996 unsigned int nofs_flag;1997 int nmirrors;1998 int i, ret;1999 2000 ret = btrfs_map_block(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,2001 &mapped_length, &bioc, NULL, NULL);2002 if (ret || !bioc || mapped_length < PAGE_SIZE) {2003 ret = -EIO;2004 goto out_put_bioc;2005 }2006 2007 if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {2008 ret = -EINVAL;2009 goto out_put_bioc;2010 }2011 2012 nofs_flag = memalloc_nofs_save();2013 nmirrors = (int)bioc->num_stripes;2014 for (i = 0; i < nmirrors; i++) {2015 u64 physical = bioc->stripes[i].physical;2016 struct btrfs_device *dev = bioc->stripes[i].dev;2017 2018 /* Missing device */2019 if (!dev->bdev)2020 continue;2021 2022 ret = btrfs_get_dev_zone(dev, physical, zone);2023 /* Failing device */2024 if (ret == -EIO || ret == -EOPNOTSUPP)2025 continue;2026 break;2027 }2028 memalloc_nofs_restore(nofs_flag);2029out_put_bioc:2030 btrfs_put_bioc(bioc);2031 return ret;2032}2033 2034/*2035 * Synchronize write pointer in a zone at @physical_start on @tgt_dev, by2036 * filling zeros between @physical_pos to a write pointer of dev-replace2037 * source device.2038 */2039int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,2040 u64 physical_start, u64 physical_pos)2041{2042 struct btrfs_fs_info *fs_info = tgt_dev->fs_info;2043 struct blk_zone zone;2044 u64 length;2045 u64 wp;2046 int ret;2047 2048 if (!btrfs_dev_is_sequential(tgt_dev, physical_pos))2049 return 0;2050 2051 ret = read_zone_info(fs_info, logical, &zone);2052 if (ret)2053 return ret;2054 2055 wp = physical_start + ((zone.wp - zone.start) << SECTOR_SHIFT);2056 2057 if (physical_pos == wp)2058 return 0;2059 2060 if (physical_pos > wp)2061 return -EUCLEAN;2062 2063 length = wp - physical_pos;2064 return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length);2065}2066 2067/*2068 * Activate block group and underlying device zones2069 *2070 * @block_group: the block group to activate2071 *2072 * Return: true on success, false otherwise2073 */2074bool btrfs_zone_activate(struct btrfs_block_group *block_group)2075{2076 struct btrfs_fs_info *fs_info = block_group->fs_info;2077 struct btrfs_chunk_map *map;2078 struct btrfs_device *device;2079 u64 physical;2080 const bool is_data = (block_group->flags & BTRFS_BLOCK_GROUP_DATA);2081 bool ret;2082 int i;2083 2084 if (!btrfs_is_zoned(block_group->fs_info))2085 return true;2086 2087 map = block_group->physical_map;2088 2089 spin_lock(&fs_info->zone_active_bgs_lock);2090 spin_lock(&block_group->lock);2091 if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) {2092 ret = true;2093 goto out_unlock;2094 }2095 2096 /* No space left */2097 if (btrfs_zoned_bg_is_full(block_group)) {2098 ret = false;2099 goto out_unlock;2100 }2101 2102 for (i = 0; i < map->num_stripes; i++) {2103 struct btrfs_zoned_device_info *zinfo;2104 int reserved = 0;2105 2106 device = map->stripes[i].dev;2107 physical = map->stripes[i].physical;2108 zinfo = device->zone_info;2109 2110 if (zinfo->max_active_zones == 0)2111 continue;2112 2113 if (is_data)2114 reserved = zinfo->reserved_active_zones;2115 /*2116 * For the data block group, leave active zones for one2117 * metadata block group and one system block group.2118 */2119 if (atomic_read(&zinfo->active_zones_left) <= reserved) {2120 ret = false;2121 goto out_unlock;2122 }2123 2124 if (!btrfs_dev_set_active_zone(device, physical)) {2125 /* Cannot activate the zone */2126 ret = false;2127 goto out_unlock;2128 }2129 if (!is_data)2130 zinfo->reserved_active_zones--;2131 }2132 2133 /* Successfully activated all the zones */2134 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);2135 spin_unlock(&block_group->lock);2136 2137 /* For the active block group list */2138 btrfs_get_block_group(block_group);2139 list_add_tail(&block_group->active_bg_list, &fs_info->zone_active_bgs);2140 spin_unlock(&fs_info->zone_active_bgs_lock);2141 2142 return true;2143 2144out_unlock:2145 spin_unlock(&block_group->lock);2146 spin_unlock(&fs_info->zone_active_bgs_lock);2147 return ret;2148}2149 2150static void wait_eb_writebacks(struct btrfs_block_group *block_group)2151{2152 struct btrfs_fs_info *fs_info = block_group->fs_info;2153 const u64 end = block_group->start + block_group->length;2154 struct radix_tree_iter iter;2155 struct extent_buffer *eb;2156 void __rcu **slot;2157 2158 rcu_read_lock();2159 radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter,2160 block_group->start >> fs_info->sectorsize_bits) {2161 eb = radix_tree_deref_slot(slot);2162 if (!eb)2163 continue;2164 if (radix_tree_deref_retry(eb)) {2165 slot = radix_tree_iter_retry(&iter);2166 continue;2167 }2168 2169 if (eb->start < block_group->start)2170 continue;2171 if (eb->start >= end)2172 break;2173 2174 slot = radix_tree_iter_resume(slot, &iter);2175 rcu_read_unlock();2176 wait_on_extent_buffer_writeback(eb);2177 rcu_read_lock();2178 }2179 rcu_read_unlock();2180}2181 2182static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written)2183{2184 struct btrfs_fs_info *fs_info = block_group->fs_info;2185 struct btrfs_chunk_map *map;2186 const bool is_metadata = (block_group->flags &2187 (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM));2188 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;2189 int ret = 0;2190 int i;2191 2192 spin_lock(&block_group->lock);2193 if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) {2194 spin_unlock(&block_group->lock);2195 return 0;2196 }2197 2198 /* Check if we have unwritten allocated space */2199 if (is_metadata &&2200 block_group->start + block_group->alloc_offset > block_group->meta_write_pointer) {2201 spin_unlock(&block_group->lock);2202 return -EAGAIN;2203 }2204 2205 /*2206 * If we are sure that the block group is full (= no more room left for2207 * new allocation) and the IO for the last usable block is completed, we2208 * don't need to wait for the other IOs. This holds because we ensure2209 * the sequential IO submissions using the ZONE_APPEND command for data2210 * and block_group->meta_write_pointer for metadata.2211 */2212 if (!fully_written) {2213 if (test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) {2214 spin_unlock(&block_group->lock);2215 return -EAGAIN;2216 }2217 spin_unlock(&block_group->lock);2218 2219 ret = btrfs_inc_block_group_ro(block_group, false);2220 if (ret)2221 return ret;2222 2223 /* Ensure all writes in this block group finish */2224 btrfs_wait_block_group_reservations(block_group);2225 /* No need to wait for NOCOW writers. Zoned mode does not allow that */2226 btrfs_wait_ordered_roots(fs_info, U64_MAX, block_group);2227 /* Wait for extent buffers to be written. */2228 if (is_metadata)2229 wait_eb_writebacks(block_group);2230 2231 spin_lock(&block_group->lock);2232 2233 /*2234 * Bail out if someone already deactivated the block group, or2235 * allocated space is left in the block group.2236 */2237 if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,2238 &block_group->runtime_flags)) {2239 spin_unlock(&block_group->lock);2240 btrfs_dec_block_group_ro(block_group);2241 return 0;2242 }2243 2244 if (block_group->reserved ||2245 test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,2246 &block_group->runtime_flags)) {2247 spin_unlock(&block_group->lock);2248 btrfs_dec_block_group_ro(block_group);2249 return -EAGAIN;2250 }2251 }2252 2253 clear_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);2254 block_group->alloc_offset = block_group->zone_capacity;2255 if (block_group->flags & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))2256 block_group->meta_write_pointer = block_group->start +2257 block_group->zone_capacity;2258 block_group->free_space_ctl->free_space = 0;2259 btrfs_clear_treelog_bg(block_group);2260 btrfs_clear_data_reloc_bg(block_group);2261 spin_unlock(&block_group->lock);2262 2263 down_read(&dev_replace->rwsem);2264 map = block_group->physical_map;2265 for (i = 0; i < map->num_stripes; i++) {2266 struct btrfs_device *device = map->stripes[i].dev;2267 const u64 physical = map->stripes[i].physical;2268 struct btrfs_zoned_device_info *zinfo = device->zone_info;2269 unsigned int nofs_flags;2270 2271 if (zinfo->max_active_zones == 0)2272 continue;2273 2274 nofs_flags = memalloc_nofs_save();2275 ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_FINISH,2276 physical >> SECTOR_SHIFT,2277 zinfo->zone_size >> SECTOR_SHIFT);2278 memalloc_nofs_restore(nofs_flags);2279 2280 if (ret) {2281 up_read(&dev_replace->rwsem);2282 return ret;2283 }2284 2285 if (!(block_group->flags & BTRFS_BLOCK_GROUP_DATA))2286 zinfo->reserved_active_zones++;2287 btrfs_dev_clear_active_zone(device, physical);2288 }2289 up_read(&dev_replace->rwsem);2290 2291 if (!fully_written)2292 btrfs_dec_block_group_ro(block_group);2293 2294 spin_lock(&fs_info->zone_active_bgs_lock);2295 ASSERT(!list_empty(&block_group->active_bg_list));2296 list_del_init(&block_group->active_bg_list);2297 spin_unlock(&fs_info->zone_active_bgs_lock);2298 2299 /* For active_bg_list */2300 btrfs_put_block_group(block_group);2301 2302 clear_and_wake_up_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);2303 2304 return 0;2305}2306 2307int btrfs_zone_finish(struct btrfs_block_group *block_group)2308{2309 if (!btrfs_is_zoned(block_group->fs_info))2310 return 0;2311 2312 return do_zone_finish(block_group, false);2313}2314 2315bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags)2316{2317 struct btrfs_fs_info *fs_info = fs_devices->fs_info;2318 struct btrfs_device *device;2319 bool ret = false;2320 2321 if (!btrfs_is_zoned(fs_info))2322 return true;2323 2324 /* Check if there is a device with active zones left */2325 mutex_lock(&fs_info->chunk_mutex);2326 spin_lock(&fs_info->zone_active_bgs_lock);2327 list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {2328 struct btrfs_zoned_device_info *zinfo = device->zone_info;2329 int reserved = 0;2330 2331 if (!device->bdev)2332 continue;2333 2334 if (!zinfo->max_active_zones) {2335 ret = true;2336 break;2337 }2338 2339 if (flags & BTRFS_BLOCK_GROUP_DATA)2340 reserved = zinfo->reserved_active_zones;2341 2342 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {2343 case 0: /* single */2344 ret = (atomic_read(&zinfo->active_zones_left) >= (1 + reserved));2345 break;2346 case BTRFS_BLOCK_GROUP_DUP:2347 ret = (atomic_read(&zinfo->active_zones_left) >= (2 + reserved));2348 break;2349 }2350 if (ret)2351 break;2352 }2353 spin_unlock(&fs_info->zone_active_bgs_lock);2354 mutex_unlock(&fs_info->chunk_mutex);2355 2356 if (!ret)2357 set_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);2358 2359 return ret;2360}2361 2362void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical, u64 length)2363{2364 struct btrfs_block_group *block_group;2365 u64 min_alloc_bytes;2366 2367 if (!btrfs_is_zoned(fs_info))2368 return;2369 2370 block_group = btrfs_lookup_block_group(fs_info, logical);2371 ASSERT(block_group);2372 2373 /* No MIXED_BG on zoned btrfs. */2374 if (block_group->flags & BTRFS_BLOCK_GROUP_DATA)2375 min_alloc_bytes = fs_info->sectorsize;2376 else2377 min_alloc_bytes = fs_info->nodesize;2378 2379 /* Bail out if we can allocate more data from this block group. */2380 if (logical + length + min_alloc_bytes <=2381 block_group->start + block_group->zone_capacity)2382 goto out;2383 2384 do_zone_finish(block_group, true);2385 2386out:2387 btrfs_put_block_group(block_group);2388}2389 2390static void btrfs_zone_finish_endio_workfn(struct work_struct *work)2391{2392 struct btrfs_block_group *bg =2393 container_of(work, struct btrfs_block_group, zone_finish_work);2394 2395 wait_on_extent_buffer_writeback(bg->last_eb);2396 free_extent_buffer(bg->last_eb);2397 btrfs_zone_finish_endio(bg->fs_info, bg->start, bg->length);2398 btrfs_put_block_group(bg);2399}2400 2401void btrfs_schedule_zone_finish_bg(struct btrfs_block_group *bg,2402 struct extent_buffer *eb)2403{2404 if (!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &bg->runtime_flags) ||2405 eb->start + eb->len * 2 <= bg->start + bg->zone_capacity)2406 return;2407 2408 if (WARN_ON(bg->zone_finish_work.func == btrfs_zone_finish_endio_workfn)) {2409 btrfs_err(bg->fs_info, "double scheduling of bg %llu zone finishing",2410 bg->start);2411 return;2412 }2413 2414 /* For the work */2415 btrfs_get_block_group(bg);2416 atomic_inc(&eb->refs);2417 bg->last_eb = eb;2418 INIT_WORK(&bg->zone_finish_work, btrfs_zone_finish_endio_workfn);2419 queue_work(system_unbound_wq, &bg->zone_finish_work);2420}2421 2422void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg)2423{2424 struct btrfs_fs_info *fs_info = bg->fs_info;2425 2426 spin_lock(&fs_info->relocation_bg_lock);2427 if (fs_info->data_reloc_bg == bg->start)2428 fs_info->data_reloc_bg = 0;2429 spin_unlock(&fs_info->relocation_bg_lock);2430}2431 2432void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info)2433{2434 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;2435 struct btrfs_device *device;2436 2437 if (!btrfs_is_zoned(fs_info))2438 return;2439 2440 mutex_lock(&fs_devices->device_list_mutex);2441 list_for_each_entry(device, &fs_devices->devices, dev_list) {2442 if (device->zone_info) {2443 vfree(device->zone_info->zone_cache);2444 device->zone_info->zone_cache = NULL;2445 }2446 }2447 mutex_unlock(&fs_devices->device_list_mutex);2448}2449 2450bool btrfs_zoned_should_reclaim(const struct btrfs_fs_info *fs_info)2451{2452 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;2453 struct btrfs_device *device;2454 u64 used = 0;2455 u64 total = 0;2456 u64 factor;2457 2458 ASSERT(btrfs_is_zoned(fs_info));2459 2460 if (fs_info->bg_reclaim_threshold == 0)2461 return false;2462 2463 mutex_lock(&fs_devices->device_list_mutex);2464 list_for_each_entry(device, &fs_devices->devices, dev_list) {2465 if (!device->bdev)2466 continue;2467 2468 total += device->disk_total_bytes;2469 used += device->bytes_used;2470 }2471 mutex_unlock(&fs_devices->device_list_mutex);2472 2473 factor = div64_u64(used * 100, total);2474 return factor >= fs_info->bg_reclaim_threshold;2475}2476 2477void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical,2478 u64 length)2479{2480 struct btrfs_block_group *block_group;2481 2482 if (!btrfs_is_zoned(fs_info))2483 return;2484 2485 block_group = btrfs_lookup_block_group(fs_info, logical);2486 /* It should be called on a previous data relocation block group. */2487 ASSERT(block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA));2488 2489 spin_lock(&block_group->lock);2490 if (!test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags))2491 goto out;2492 2493 /* All relocation extents are written. */2494 if (block_group->start + block_group->alloc_offset == logical + length) {2495 /*2496 * Now, release this block group for further allocations and2497 * zone finish.2498 */2499 clear_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,2500 &block_group->runtime_flags);2501 }2502 2503out:2504 spin_unlock(&block_group->lock);2505 btrfs_put_block_group(block_group);2506}2507 2508int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info)2509{2510 struct btrfs_block_group *block_group;2511 struct btrfs_block_group *min_bg = NULL;2512 u64 min_avail = U64_MAX;2513 int ret;2514 2515 spin_lock(&fs_info->zone_active_bgs_lock);2516 list_for_each_entry(block_group, &fs_info->zone_active_bgs,2517 active_bg_list) {2518 u64 avail;2519 2520 spin_lock(&block_group->lock);2521 if (block_group->reserved || block_group->alloc_offset == 0 ||2522 (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM) ||2523 test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) {2524 spin_unlock(&block_group->lock);2525 continue;2526 }2527 2528 avail = block_group->zone_capacity - block_group->alloc_offset;2529 if (min_avail > avail) {2530 if (min_bg)2531 btrfs_put_block_group(min_bg);2532 min_bg = block_group;2533 min_avail = avail;2534 btrfs_get_block_group(min_bg);2535 }2536 spin_unlock(&block_group->lock);2537 }2538 spin_unlock(&fs_info->zone_active_bgs_lock);2539 2540 if (!min_bg)2541 return 0;2542 2543 ret = btrfs_zone_finish(min_bg);2544 btrfs_put_block_group(min_bg);2545 2546 return ret < 0 ? ret : 1;2547}2548 2549int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info,2550 struct btrfs_space_info *space_info,2551 bool do_finish)2552{2553 struct btrfs_block_group *bg;2554 int index;2555 2556 if (!btrfs_is_zoned(fs_info) || (space_info->flags & BTRFS_BLOCK_GROUP_DATA))2557 return 0;2558 2559 for (;;) {2560 int ret;2561 bool need_finish = false;2562 2563 down_read(&space_info->groups_sem);2564 for (index = 0; index < BTRFS_NR_RAID_TYPES; index++) {2565 list_for_each_entry(bg, &space_info->block_groups[index],2566 list) {2567 if (!spin_trylock(&bg->lock))2568 continue;2569 if (btrfs_zoned_bg_is_full(bg) ||2570 test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,2571 &bg->runtime_flags)) {2572 spin_unlock(&bg->lock);2573 continue;2574 }2575 spin_unlock(&bg->lock);2576 2577 if (btrfs_zone_activate(bg)) {2578 up_read(&space_info->groups_sem);2579 return 1;2580 }2581 2582 need_finish = true;2583 }2584 }2585 up_read(&space_info->groups_sem);2586 2587 if (!do_finish || !need_finish)2588 break;2589 2590 ret = btrfs_zone_finish_one_bg(fs_info);2591 if (ret == 0)2592 break;2593 if (ret < 0)2594 return ret;2595 }2596 2597 return 0;2598}2599 2600/*2601 * Reserve zones for one metadata block group, one tree-log block group, and one2602 * system block group.2603 */2604void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info)2605{2606 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;2607 struct btrfs_block_group *block_group;2608 struct btrfs_device *device;2609 /* Reserve zones for normal SINGLE metadata and tree-log block group. */2610 unsigned int metadata_reserve = 2;2611 /* Reserve a zone for SINGLE system block group. */2612 unsigned int system_reserve = 1;2613 2614 if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags))2615 return;2616 2617 /*2618 * This function is called from the mount context. So, there is no2619 * parallel process touching the bits. No need for read_seqretry().2620 */2621 if (fs_info->avail_metadata_alloc_bits & BTRFS_BLOCK_GROUP_DUP)2622 metadata_reserve = 4;2623 if (fs_info->avail_system_alloc_bits & BTRFS_BLOCK_GROUP_DUP)2624 system_reserve = 2;2625 2626 /* Apply the reservation on all the devices. */2627 mutex_lock(&fs_devices->device_list_mutex);2628 list_for_each_entry(device, &fs_devices->devices, dev_list) {2629 if (!device->bdev)2630 continue;2631 2632 device->zone_info->reserved_active_zones =2633 metadata_reserve + system_reserve;2634 }2635 mutex_unlock(&fs_devices->device_list_mutex);2636 2637 /* Release reservation for currently active block groups. */2638 spin_lock(&fs_info->zone_active_bgs_lock);2639 list_for_each_entry(block_group, &fs_info->zone_active_bgs, active_bg_list) {2640 struct btrfs_chunk_map *map = block_group->physical_map;2641 2642 if (!(block_group->flags &2643 (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM)))2644 continue;2645 2646 for (int i = 0; i < map->num_stripes; i++)2647 map->stripes[i].dev->zone_info->reserved_active_zones--;2648 }2649 spin_unlock(&fs_info->zone_active_bgs_lock);2650}2651