diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/btrfs/zoned.c | 2533 |
1 files changed, 2533 insertions, 0 deletions
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c new file mode 100644 index 0000000000..41a8cdce5d --- /dev/null +++ b/fs/btrfs/zoned.c @@ -0,0 +1,2533 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/bitops.h> +#include <linux/slab.h> +#include <linux/blkdev.h> +#include <linux/sched/mm.h> +#include <linux/atomic.h> +#include <linux/vmalloc.h> +#include "ctree.h" +#include "volumes.h" +#include "zoned.h" +#include "rcu-string.h" +#include "disk-io.h" +#include "block-group.h" +#include "transaction.h" +#include "dev-replace.h" +#include "space-info.h" +#include "super.h" +#include "fs.h" +#include "accessors.h" +#include "bio.h" + +/* Maximum number of zones to report per blkdev_report_zones() call */ +#define BTRFS_REPORT_NR_ZONES 4096 +/* Invalid allocation pointer value for missing devices */ +#define WP_MISSING_DEV ((u64)-1) +/* Pseudo write pointer value for conventional zone */ +#define WP_CONVENTIONAL ((u64)-2) + +/* + * Location of the first zone of superblock logging zone pairs. + * + * - primary superblock: 0B (zone 0) + * - first copy: 512G (zone starting at that offset) + * - second copy: 4T (zone starting at that offset) + */ +#define BTRFS_SB_LOG_PRIMARY_OFFSET (0ULL) +#define BTRFS_SB_LOG_FIRST_OFFSET (512ULL * SZ_1G) +#define BTRFS_SB_LOG_SECOND_OFFSET (4096ULL * SZ_1G) + +#define BTRFS_SB_LOG_FIRST_SHIFT const_ilog2(BTRFS_SB_LOG_FIRST_OFFSET) +#define BTRFS_SB_LOG_SECOND_SHIFT const_ilog2(BTRFS_SB_LOG_SECOND_OFFSET) + +/* Number of superblock log zones */ +#define BTRFS_NR_SB_LOG_ZONES 2 + +/* + * Minimum of active zones we need: + * + * - BTRFS_SUPER_MIRROR_MAX zones for superblock mirrors + * - 3 zones to ensure at least one zone per SYSTEM, META and DATA block group + * - 1 zone for tree-log dedicated block group + * - 1 zone for relocation + */ +#define BTRFS_MIN_ACTIVE_ZONES (BTRFS_SUPER_MIRROR_MAX + 5) + +/* + * Minimum / maximum supported zone size. Currently, SMR disks have a zone + * size of 256MiB, and we are expecting ZNS drives to be in the 1-4GiB range. + * We do not expect the zone size to become larger than 8GiB or smaller than + * 4MiB in the near future. + */ +#define BTRFS_MAX_ZONE_SIZE SZ_8G +#define BTRFS_MIN_ZONE_SIZE SZ_4M + +#define SUPER_INFO_SECTORS ((u64)BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT) + +static void wait_eb_writebacks(struct btrfs_block_group *block_group); +static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written); + +static inline bool sb_zone_is_full(const struct blk_zone *zone) +{ + return (zone->cond == BLK_ZONE_COND_FULL) || + (zone->wp + SUPER_INFO_SECTORS > zone->start + zone->capacity); +} + +static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data) +{ + struct blk_zone *zones = data; + + memcpy(&zones[idx], zone, sizeof(*zone)); + + return 0; +} + +static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones, + u64 *wp_ret) +{ + bool empty[BTRFS_NR_SB_LOG_ZONES]; + bool full[BTRFS_NR_SB_LOG_ZONES]; + sector_t sector; + int i; + + for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) { + ASSERT(zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL); + empty[i] = (zones[i].cond == BLK_ZONE_COND_EMPTY); + full[i] = sb_zone_is_full(&zones[i]); + } + + /* + * Possible states of log buffer zones + * + * Empty[0] In use[0] Full[0] + * Empty[1] * 0 1 + * In use[1] x x 1 + * Full[1] 0 0 C + * + * Log position: + * *: Special case, no superblock is written + * 0: Use write pointer of zones[0] + * 1: Use write pointer of zones[1] + * C: Compare super blocks from zones[0] and zones[1], use the latest + * one determined by generation + * x: Invalid state + */ + + if (empty[0] && empty[1]) { + /* Special case to distinguish no superblock to read */ + *wp_ret = zones[0].start << SECTOR_SHIFT; + return -ENOENT; + } else if (full[0] && full[1]) { + /* Compare two super blocks */ + struct address_space *mapping = bdev->bd_inode->i_mapping; + struct page *page[BTRFS_NR_SB_LOG_ZONES]; + struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES]; + int i; + + for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) { + u64 zone_end = (zones[i].start + zones[i].capacity) << SECTOR_SHIFT; + u64 bytenr = ALIGN_DOWN(zone_end, BTRFS_SUPER_INFO_SIZE) - + BTRFS_SUPER_INFO_SIZE; + + page[i] = read_cache_page_gfp(mapping, + bytenr >> PAGE_SHIFT, GFP_NOFS); + if (IS_ERR(page[i])) { + if (i == 1) + btrfs_release_disk_super(super[0]); + return PTR_ERR(page[i]); + } + super[i] = page_address(page[i]); + } + + if (btrfs_super_generation(super[0]) > + btrfs_super_generation(super[1])) + sector = zones[1].start; + else + sector = zones[0].start; + + for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) + btrfs_release_disk_super(super[i]); + } else if (!full[0] && (empty[1] || full[1])) { + sector = zones[0].wp; + } else if (full[0]) { + sector = zones[1].wp; + } else { + return -EUCLEAN; + } + *wp_ret = sector << SECTOR_SHIFT; + return 0; +} + +/* + * Get the first zone number of the superblock mirror + */ +static inline u32 sb_zone_number(int shift, int mirror) +{ + u64 zone = U64_MAX; + + ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX); + switch (mirror) { + case 0: zone = 0; break; + case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break; + case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break; + } + + ASSERT(zone <= U32_MAX); + + return (u32)zone; +} + +static inline sector_t zone_start_sector(u32 zone_number, + struct block_device *bdev) +{ + return (sector_t)zone_number << ilog2(bdev_zone_sectors(bdev)); +} + +static inline u64 zone_start_physical(u32 zone_number, + struct btrfs_zoned_device_info *zone_info) +{ + return (u64)zone_number << zone_info->zone_size_shift; +} + +/* + * Emulate blkdev_report_zones() for a non-zoned device. It slices up the block + * device into static sized chunks and fake a conventional zone on each of + * them. + */ +static int emulate_report_zones(struct btrfs_device *device, u64 pos, + struct blk_zone *zones, unsigned int nr_zones) +{ + const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT; + sector_t bdev_size = bdev_nr_sectors(device->bdev); + unsigned int i; + + pos >>= SECTOR_SHIFT; + for (i = 0; i < nr_zones; i++) { + zones[i].start = i * zone_sectors + pos; + zones[i].len = zone_sectors; + zones[i].capacity = zone_sectors; + zones[i].wp = zones[i].start + zone_sectors; + zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL; + zones[i].cond = BLK_ZONE_COND_NOT_WP; + + if (zones[i].wp >= bdev_size) { + i++; + break; + } + } + + return i; +} + +static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos, + struct blk_zone *zones, unsigned int *nr_zones) +{ + struct btrfs_zoned_device_info *zinfo = device->zone_info; + int ret; + + if (!*nr_zones) + return 0; + + if (!bdev_is_zoned(device->bdev)) { + ret = emulate_report_zones(device, pos, zones, *nr_zones); + *nr_zones = ret; + return 0; + } + + /* Check cache */ + if (zinfo->zone_cache) { + unsigned int i; + u32 zno; + + ASSERT(IS_ALIGNED(pos, zinfo->zone_size)); + zno = pos >> zinfo->zone_size_shift; + /* + * We cannot report zones beyond the zone end. So, it is OK to + * cap *nr_zones to at the end. + */ + *nr_zones = min_t(u32, *nr_zones, zinfo->nr_zones - zno); + + for (i = 0; i < *nr_zones; i++) { + struct blk_zone *zone_info; + + zone_info = &zinfo->zone_cache[zno + i]; + if (!zone_info->len) + break; + } + + if (i == *nr_zones) { + /* Cache hit on all the zones */ + memcpy(zones, zinfo->zone_cache + zno, + sizeof(*zinfo->zone_cache) * *nr_zones); + return 0; + } + } + + ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones, + copy_zone_info_cb, zones); + if (ret < 0) { + btrfs_err_in_rcu(device->fs_info, + "zoned: failed to read zone %llu on %s (devid %llu)", + pos, rcu_str_deref(device->name), + device->devid); + return ret; + } + *nr_zones = ret; + if (!ret) + return -EIO; + + /* Populate cache */ + if (zinfo->zone_cache) { + u32 zno = pos >> zinfo->zone_size_shift; + + memcpy(zinfo->zone_cache + zno, zones, + sizeof(*zinfo->zone_cache) * *nr_zones); + } + + return 0; +} + +/* The emulated zone size is determined from the size of device extent */ +static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info) +{ + struct btrfs_path *path; + struct btrfs_root *root = fs_info->dev_root; + struct btrfs_key key; + struct extent_buffer *leaf; + struct btrfs_dev_extent *dext; + int ret = 0; + + key.objectid = 1; + key.type = BTRFS_DEV_EXTENT_KEY; + key.offset = 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + if (ret < 0) + goto out; + + if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { + ret = btrfs_next_leaf(root, path); + if (ret < 0) + goto out; + /* No dev extents at all? Not good */ + if (ret > 0) { + ret = -EUCLEAN; + goto out; + } + } + + leaf = path->nodes[0]; + dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent); + fs_info->zone_size = btrfs_dev_extent_length(leaf, dext); + ret = 0; + +out: + btrfs_free_path(path); + + return ret; +} + +int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info) +{ + struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; + struct btrfs_device *device; + int ret = 0; + + /* fs_info->zone_size might not set yet. Use the incomapt flag here. */ + if (!btrfs_fs_incompat(fs_info, ZONED)) + return 0; + + mutex_lock(&fs_devices->device_list_mutex); + list_for_each_entry(device, &fs_devices->devices, dev_list) { + /* We can skip reading of zone info for missing devices */ + if (!device->bdev) + continue; + + ret = btrfs_get_dev_zone_info(device, true); + if (ret) + break; + } + mutex_unlock(&fs_devices->device_list_mutex); + + return ret; +} + +int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache) +{ + struct btrfs_fs_info *fs_info = device->fs_info; + struct btrfs_zoned_device_info *zone_info = NULL; + struct block_device *bdev = device->bdev; + unsigned int max_active_zones; + unsigned int nactive; + sector_t nr_sectors; + sector_t sector = 0; + struct blk_zone *zones = NULL; + unsigned int i, nreported = 0, nr_zones; + sector_t zone_sectors; + char *model, *emulated; + int ret; + + /* + * Cannot use btrfs_is_zoned here, since fs_info::zone_size might not + * yet be set. + */ + if (!btrfs_fs_incompat(fs_info, ZONED)) + return 0; + + if (device->zone_info) + return 0; + + zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL); + if (!zone_info) + return -ENOMEM; + + device->zone_info = zone_info; + + if (!bdev_is_zoned(bdev)) { + if (!fs_info->zone_size) { + ret = calculate_emulated_zone_size(fs_info); + if (ret) + goto out; + } + + ASSERT(fs_info->zone_size); + zone_sectors = fs_info->zone_size >> SECTOR_SHIFT; + } else { + zone_sectors = bdev_zone_sectors(bdev); + } + + ASSERT(is_power_of_two_u64(zone_sectors)); + zone_info->zone_size = zone_sectors << SECTOR_SHIFT; + + /* We reject devices with a zone size larger than 8GB */ + if (zone_info->zone_size > BTRFS_MAX_ZONE_SIZE) { + btrfs_err_in_rcu(fs_info, + "zoned: %s: zone size %llu larger than supported maximum %llu", + rcu_str_deref(device->name), + zone_info->zone_size, BTRFS_MAX_ZONE_SIZE); + ret = -EINVAL; + goto out; + } else if (zone_info->zone_size < BTRFS_MIN_ZONE_SIZE) { + btrfs_err_in_rcu(fs_info, + "zoned: %s: zone size %llu smaller than supported minimum %u", + rcu_str_deref(device->name), + zone_info->zone_size, BTRFS_MIN_ZONE_SIZE); + ret = -EINVAL; + goto out; + } + + nr_sectors = bdev_nr_sectors(bdev); + zone_info->zone_size_shift = ilog2(zone_info->zone_size); + zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors); + if (!IS_ALIGNED(nr_sectors, zone_sectors)) + zone_info->nr_zones++; + + max_active_zones = bdev_max_active_zones(bdev); + if (max_active_zones && max_active_zones < BTRFS_MIN_ACTIVE_ZONES) { + btrfs_err_in_rcu(fs_info, +"zoned: %s: max active zones %u is too small, need at least %u active zones", + rcu_str_deref(device->name), max_active_zones, + BTRFS_MIN_ACTIVE_ZONES); + ret = -EINVAL; + goto out; + } + zone_info->max_active_zones = max_active_zones; + + zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL); + if (!zone_info->seq_zones) { + ret = -ENOMEM; + goto out; + } + + zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL); + if (!zone_info->empty_zones) { + ret = -ENOMEM; + goto out; + } + + zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL); + if (!zone_info->active_zones) { + ret = -ENOMEM; + goto out; + } + + zones = kvcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL); + if (!zones) { + ret = -ENOMEM; + goto out; + } + + /* + * Enable zone cache only for a zoned device. On a non-zoned device, we + * fill the zone info with emulated CONVENTIONAL zones, so no need to + * use the cache. + */ + if (populate_cache && bdev_is_zoned(device->bdev)) { + zone_info->zone_cache = vcalloc(zone_info->nr_zones, + sizeof(struct blk_zone)); + if (!zone_info->zone_cache) { + btrfs_err_in_rcu(device->fs_info, + "zoned: failed to allocate zone cache for %s", + rcu_str_deref(device->name)); + ret = -ENOMEM; + goto out; + } + } + + /* Get zones type */ + nactive = 0; + while (sector < nr_sectors) { + nr_zones = BTRFS_REPORT_NR_ZONES; + ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones, + &nr_zones); + if (ret) + goto out; + + for (i = 0; i < nr_zones; i++) { + if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ) + __set_bit(nreported, zone_info->seq_zones); + switch (zones[i].cond) { + case BLK_ZONE_COND_EMPTY: + __set_bit(nreported, zone_info->empty_zones); + break; + case BLK_ZONE_COND_IMP_OPEN: + case BLK_ZONE_COND_EXP_OPEN: + case BLK_ZONE_COND_CLOSED: + __set_bit(nreported, zone_info->active_zones); + nactive++; + break; + } + nreported++; + } + sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len; + } + + if (nreported != zone_info->nr_zones) { + btrfs_err_in_rcu(device->fs_info, + "inconsistent number of zones on %s (%u/%u)", + rcu_str_deref(device->name), nreported, + zone_info->nr_zones); + ret = -EIO; + goto out; + } + + if (max_active_zones) { + if (nactive > max_active_zones) { + btrfs_err_in_rcu(device->fs_info, + "zoned: %u active zones on %s exceeds max_active_zones %u", + nactive, rcu_str_deref(device->name), + max_active_zones); + ret = -EIO; + goto out; + } + atomic_set(&zone_info->active_zones_left, + max_active_zones - nactive); + set_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags); + } + + /* Validate superblock log */ + nr_zones = BTRFS_NR_SB_LOG_ZONES; + for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { + u32 sb_zone; + u64 sb_wp; + int sb_pos = BTRFS_NR_SB_LOG_ZONES * i; + + sb_zone = sb_zone_number(zone_info->zone_size_shift, i); + if (sb_zone + 1 >= zone_info->nr_zones) + continue; + + ret = btrfs_get_dev_zones(device, + zone_start_physical(sb_zone, zone_info), + &zone_info->sb_zones[sb_pos], + &nr_zones); + if (ret) + goto out; + + if (nr_zones != BTRFS_NR_SB_LOG_ZONES) { + btrfs_err_in_rcu(device->fs_info, + "zoned: failed to read super block log zone info at devid %llu zone %u", + device->devid, sb_zone); + ret = -EUCLEAN; + goto out; + } + + /* + * If zones[0] is conventional, always use the beginning of the + * zone to record superblock. No need to validate in that case. + */ + if (zone_info->sb_zones[BTRFS_NR_SB_LOG_ZONES * i].type == + BLK_ZONE_TYPE_CONVENTIONAL) + continue; + + ret = sb_write_pointer(device->bdev, + &zone_info->sb_zones[sb_pos], &sb_wp); + if (ret != -ENOENT && ret) { + btrfs_err_in_rcu(device->fs_info, + "zoned: super block log zone corrupted devid %llu zone %u", + device->devid, sb_zone); + ret = -EUCLEAN; + goto out; + } + } + + + kvfree(zones); + + switch (bdev_zoned_model(bdev)) { + case BLK_ZONED_HM: + model = "host-managed zoned"; + emulated = ""; + break; + case BLK_ZONED_HA: + model = "host-aware zoned"; + emulated = ""; + break; + case BLK_ZONED_NONE: + model = "regular"; + emulated = "emulated "; + break; + default: + /* Just in case */ + btrfs_err_in_rcu(fs_info, "zoned: unsupported model %d on %s", + bdev_zoned_model(bdev), + rcu_str_deref(device->name)); + ret = -EOPNOTSUPP; + goto out_free_zone_info; + } + + btrfs_info_in_rcu(fs_info, + "%s block device %s, %u %szones of %llu bytes", + model, rcu_str_deref(device->name), zone_info->nr_zones, + emulated, zone_info->zone_size); + + return 0; + +out: + kvfree(zones); +out_free_zone_info: + btrfs_destroy_dev_zone_info(device); + + return ret; +} + +void btrfs_destroy_dev_zone_info(struct btrfs_device *device) +{ + struct btrfs_zoned_device_info *zone_info = device->zone_info; + + if (!zone_info) + return; + + bitmap_free(zone_info->active_zones); + bitmap_free(zone_info->seq_zones); + bitmap_free(zone_info->empty_zones); + vfree(zone_info->zone_cache); + kfree(zone_info); + device->zone_info = NULL; +} + +struct btrfs_zoned_device_info *btrfs_clone_dev_zone_info(struct btrfs_device *orig_dev) +{ + struct btrfs_zoned_device_info *zone_info; + + zone_info = kmemdup(orig_dev->zone_info, sizeof(*zone_info), GFP_KERNEL); + if (!zone_info) + return NULL; + + zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL); + if (!zone_info->seq_zones) + goto out; + + bitmap_copy(zone_info->seq_zones, orig_dev->zone_info->seq_zones, + zone_info->nr_zones); + + zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL); + if (!zone_info->empty_zones) + goto out; + + bitmap_copy(zone_info->empty_zones, orig_dev->zone_info->empty_zones, + zone_info->nr_zones); + + zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL); + if (!zone_info->active_zones) + goto out; + + bitmap_copy(zone_info->active_zones, orig_dev->zone_info->active_zones, + zone_info->nr_zones); + zone_info->zone_cache = NULL; + + return zone_info; + +out: + bitmap_free(zone_info->seq_zones); + bitmap_free(zone_info->empty_zones); + bitmap_free(zone_info->active_zones); + kfree(zone_info); + return NULL; +} + +int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos, + struct blk_zone *zone) +{ + unsigned int nr_zones = 1; + int ret; + + ret = btrfs_get_dev_zones(device, pos, zone, &nr_zones); + if (ret != 0 || !nr_zones) + return ret ? ret : -EIO; + + return 0; +} + +static int btrfs_check_for_zoned_device(struct btrfs_fs_info *fs_info) +{ + struct btrfs_device *device; + + list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { + if (device->bdev && + bdev_zoned_model(device->bdev) == BLK_ZONED_HM) { + btrfs_err(fs_info, + "zoned: mode not enabled but zoned device found: %pg", + device->bdev); + return -EINVAL; + } + } + + return 0; +} + +int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info) +{ + struct queue_limits *lim = &fs_info->limits; + struct btrfs_device *device; + u64 zone_size = 0; + int ret; + + /* + * Host-Managed devices can't be used without the ZONED flag. With the + * ZONED all devices can be used, using zone emulation if required. + */ + if (!btrfs_fs_incompat(fs_info, ZONED)) + return btrfs_check_for_zoned_device(fs_info); + + blk_set_stacking_limits(lim); + + list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { + struct btrfs_zoned_device_info *zone_info = device->zone_info; + + if (!device->bdev) + continue; + + if (!zone_size) { + zone_size = zone_info->zone_size; + } else if (zone_info->zone_size != zone_size) { + btrfs_err(fs_info, + "zoned: unequal block device zone sizes: have %llu found %llu", + zone_info->zone_size, zone_size); + return -EINVAL; + } + + /* + * With the zoned emulation, we can have non-zoned device on the + * zoned mode. In this case, we don't have a valid max zone + * append size. + */ + if (bdev_is_zoned(device->bdev)) { + blk_stack_limits(lim, + &bdev_get_queue(device->bdev)->limits, + 0); + } + } + + /* + * stripe_size is always aligned to BTRFS_STRIPE_LEN in + * btrfs_create_chunk(). Since we want stripe_len == zone_size, + * check the alignment here. + */ + if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) { + btrfs_err(fs_info, + "zoned: zone size %llu not aligned to stripe %u", + zone_size, BTRFS_STRIPE_LEN); + return -EINVAL; + } + + if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) { + btrfs_err(fs_info, "zoned: mixed block groups not supported"); + return -EINVAL; + } + + fs_info->zone_size = zone_size; + /* + * Also limit max_zone_append_size by max_segments * PAGE_SIZE. + * Technically, we can have multiple pages per segment. But, since + * we add the pages one by one to a bio, and cannot increase the + * metadata reservation even if it increases the number of extents, it + * is safe to stick with the limit. + */ + fs_info->max_zone_append_size = ALIGN_DOWN( + min3((u64)lim->max_zone_append_sectors << SECTOR_SHIFT, + (u64)lim->max_sectors << SECTOR_SHIFT, + (u64)lim->max_segments << PAGE_SHIFT), + fs_info->sectorsize); + fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED; + if (fs_info->max_zone_append_size < fs_info->max_extent_size) + fs_info->max_extent_size = fs_info->max_zone_append_size; + + /* + * Check mount options here, because we might change fs_info->zoned + * from fs_info->zone_size. + */ + ret = btrfs_check_mountopts_zoned(fs_info); + if (ret) + return ret; + + btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size); + return 0; +} + +int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info) +{ + if (!btrfs_is_zoned(info)) + return 0; + + /* + * Space cache writing is not COWed. Disable that to avoid write errors + * in sequential zones. + */ + if (btrfs_test_opt(info, SPACE_CACHE)) { + btrfs_err(info, "zoned: space cache v1 is not supported"); + return -EINVAL; + } + + if (btrfs_test_opt(info, NODATACOW)) { + btrfs_err(info, "zoned: NODATACOW not supported"); + return -EINVAL; + } + + btrfs_clear_and_info(info, DISCARD_ASYNC, + "zoned: async discard ignored and disabled for zoned mode"); + + return 0; +} + +static int sb_log_location(struct block_device *bdev, struct blk_zone *zones, + int rw, u64 *bytenr_ret) +{ + u64 wp; + int ret; + + if (zones[0].type == BLK_ZONE_TYPE_CONVENTIONAL) { + *bytenr_ret = zones[0].start << SECTOR_SHIFT; + return 0; + } + + ret = sb_write_pointer(bdev, zones, &wp); + if (ret != -ENOENT && ret < 0) + return ret; + + if (rw == WRITE) { + struct blk_zone *reset = NULL; + + if (wp == zones[0].start << SECTOR_SHIFT) + reset = &zones[0]; + else if (wp == zones[1].start << SECTOR_SHIFT) + reset = &zones[1]; + + if (reset && reset->cond != BLK_ZONE_COND_EMPTY) { + ASSERT(sb_zone_is_full(reset)); + + ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET, + reset->start, reset->len, + GFP_NOFS); + if (ret) + return ret; + + reset->cond = BLK_ZONE_COND_EMPTY; + reset->wp = reset->start; + } + } else if (ret != -ENOENT) { + /* + * For READ, we want the previous one. Move write pointer to + * the end of a zone, if it is at the head of a zone. + */ + u64 zone_end = 0; + + if (wp == zones[0].start << SECTOR_SHIFT) + zone_end = zones[1].start + zones[1].capacity; + else if (wp == zones[1].start << SECTOR_SHIFT) + zone_end = zones[0].start + zones[0].capacity; + if (zone_end) + wp = ALIGN_DOWN(zone_end << SECTOR_SHIFT, + BTRFS_SUPER_INFO_SIZE); + + wp -= BTRFS_SUPER_INFO_SIZE; + } + + *bytenr_ret = wp; + return 0; + +} + +int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw, + u64 *bytenr_ret) +{ + struct blk_zone zones[BTRFS_NR_SB_LOG_ZONES]; + sector_t zone_sectors; + u32 sb_zone; + int ret; + u8 zone_sectors_shift; + sector_t nr_sectors; + u32 nr_zones; + + if (!bdev_is_zoned(bdev)) { + *bytenr_ret = btrfs_sb_offset(mirror); + return 0; + } + + ASSERT(rw == READ || rw == WRITE); + + zone_sectors = bdev_zone_sectors(bdev); + if (!is_power_of_2(zone_sectors)) + return -EINVAL; + zone_sectors_shift = ilog2(zone_sectors); + nr_sectors = bdev_nr_sectors(bdev); + nr_zones = nr_sectors >> zone_sectors_shift; + + sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror); + if (sb_zone + 1 >= nr_zones) + return -ENOENT; + + ret = blkdev_report_zones(bdev, zone_start_sector(sb_zone, bdev), + BTRFS_NR_SB_LOG_ZONES, copy_zone_info_cb, + zones); + if (ret < 0) + return ret; + if (ret != BTRFS_NR_SB_LOG_ZONES) + return -EIO; + + return sb_log_location(bdev, zones, rw, bytenr_ret); +} + +int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw, + u64 *bytenr_ret) +{ + struct btrfs_zoned_device_info *zinfo = device->zone_info; + u32 zone_num; + + /* + * For a zoned filesystem on a non-zoned block device, use the same + * super block locations as regular filesystem. Doing so, the super + * block can always be retrieved and the zoned flag of the volume + * detected from the super block information. + */ + if (!bdev_is_zoned(device->bdev)) { + *bytenr_ret = btrfs_sb_offset(mirror); + return 0; + } + + zone_num = sb_zone_number(zinfo->zone_size_shift, mirror); + if (zone_num + 1 >= zinfo->nr_zones) + return -ENOENT; + + return sb_log_location(device->bdev, + &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror], + rw, bytenr_ret); +} + +static inline bool is_sb_log_zone(struct btrfs_zoned_device_info *zinfo, + int mirror) +{ + u32 zone_num; + + if (!zinfo) + return false; + + zone_num = sb_zone_number(zinfo->zone_size_shift, mirror); + if (zone_num + 1 >= zinfo->nr_zones) + return false; + + if (!test_bit(zone_num, zinfo->seq_zones)) + return false; + + return true; +} + +int btrfs_advance_sb_log(struct btrfs_device *device, int mirror) +{ + struct btrfs_zoned_device_info *zinfo = device->zone_info; + struct blk_zone *zone; + int i; + + if (!is_sb_log_zone(zinfo, mirror)) + return 0; + + zone = &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror]; + for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) { + /* Advance the next zone */ + if (zone->cond == BLK_ZONE_COND_FULL) { + zone++; + continue; + } + + if (zone->cond == BLK_ZONE_COND_EMPTY) + zone->cond = BLK_ZONE_COND_IMP_OPEN; + + zone->wp += SUPER_INFO_SECTORS; + + if (sb_zone_is_full(zone)) { + /* + * No room left to write new superblock. Since + * superblock is written with REQ_SYNC, it is safe to + * finish the zone now. + * + * If the write pointer is exactly at the capacity, + * explicit ZONE_FINISH is not necessary. + */ + if (zone->wp != zone->start + zone->capacity) { + int ret; + + ret = blkdev_zone_mgmt(device->bdev, + REQ_OP_ZONE_FINISH, zone->start, + zone->len, GFP_NOFS); + if (ret) + return ret; + } + + zone->wp = zone->start + zone->len; + zone->cond = BLK_ZONE_COND_FULL; + } + return 0; + } + + /* All the zones are FULL. Should not reach here. */ + ASSERT(0); + return -EIO; +} + +int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror) +{ + sector_t zone_sectors; + sector_t nr_sectors; + u8 zone_sectors_shift; + u32 sb_zone; + u32 nr_zones; + + zone_sectors = bdev_zone_sectors(bdev); + zone_sectors_shift = ilog2(zone_sectors); + nr_sectors = bdev_nr_sectors(bdev); + nr_zones = nr_sectors >> zone_sectors_shift; + + sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror); + if (sb_zone + 1 >= nr_zones) + return -ENOENT; + + return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET, + zone_start_sector(sb_zone, bdev), + zone_sectors * BTRFS_NR_SB_LOG_ZONES, GFP_NOFS); +} + +/* + * Find allocatable zones within a given region. + * + * @device: the device to allocate a region on + * @hole_start: the position of the hole to allocate the region + * @num_bytes: size of wanted region + * @hole_end: the end of the hole + * @return: position of allocatable zones + * + * Allocatable region should not contain any superblock locations. + */ +u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start, + u64 hole_end, u64 num_bytes) +{ + struct btrfs_zoned_device_info *zinfo = device->zone_info; + const u8 shift = zinfo->zone_size_shift; + u64 nzones = num_bytes >> shift; + u64 pos = hole_start; + u64 begin, end; + bool have_sb; + int i; + + ASSERT(IS_ALIGNED(hole_start, zinfo->zone_size)); + ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size)); + + while (pos < hole_end) { + begin = pos >> shift; + end = begin + nzones; + + if (end > zinfo->nr_zones) + return hole_end; + + /* Check if zones in the region are all empty */ + if (btrfs_dev_is_sequential(device, pos) && + !bitmap_test_range_all_set(zinfo->empty_zones, begin, nzones)) { + pos += zinfo->zone_size; + continue; + } + + have_sb = false; + for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { + u32 sb_zone; + u64 sb_pos; + + sb_zone = sb_zone_number(shift, i); + if (!(end <= sb_zone || + sb_zone + BTRFS_NR_SB_LOG_ZONES <= begin)) { + have_sb = true; + pos = zone_start_physical( + sb_zone + BTRFS_NR_SB_LOG_ZONES, zinfo); + break; + } + + /* We also need to exclude regular superblock positions */ + sb_pos = btrfs_sb_offset(i); + if (!(pos + num_bytes <= sb_pos || + sb_pos + BTRFS_SUPER_INFO_SIZE <= pos)) { + have_sb = true; + pos = ALIGN(sb_pos + BTRFS_SUPER_INFO_SIZE, + zinfo->zone_size); + break; + } + } + if (!have_sb) + break; + } + + return pos; +} + +static bool btrfs_dev_set_active_zone(struct btrfs_device *device, u64 pos) +{ + struct btrfs_zoned_device_info *zone_info = device->zone_info; + unsigned int zno = (pos >> zone_info->zone_size_shift); + + /* We can use any number of zones */ + if (zone_info->max_active_zones == 0) + return true; + + if (!test_bit(zno, zone_info->active_zones)) { + /* Active zone left? */ + if (atomic_dec_if_positive(&zone_info->active_zones_left) < 0) + return false; + if (test_and_set_bit(zno, zone_info->active_zones)) { + /* Someone already set the bit */ + atomic_inc(&zone_info->active_zones_left); + } + } + + return true; +} + +static void btrfs_dev_clear_active_zone(struct btrfs_device *device, u64 pos) +{ + struct btrfs_zoned_device_info *zone_info = device->zone_info; + unsigned int zno = (pos >> zone_info->zone_size_shift); + + /* We can use any number of zones */ + if (zone_info->max_active_zones == 0) + return; + + if (test_and_clear_bit(zno, zone_info->active_zones)) + atomic_inc(&zone_info->active_zones_left); +} + +int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical, + u64 length, u64 *bytes) +{ + int ret; + + *bytes = 0; + ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_RESET, + physical >> SECTOR_SHIFT, length >> SECTOR_SHIFT, + GFP_NOFS); + if (ret) + return ret; + + *bytes = length; + while (length) { + btrfs_dev_set_zone_empty(device, physical); + btrfs_dev_clear_active_zone(device, physical); + physical += device->zone_info->zone_size; + length -= device->zone_info->zone_size; + } + + return 0; +} + +int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size) +{ + struct btrfs_zoned_device_info *zinfo = device->zone_info; + const u8 shift = zinfo->zone_size_shift; + unsigned long begin = start >> shift; + unsigned long nbits = size >> shift; + u64 pos; + int ret; + + ASSERT(IS_ALIGNED(start, zinfo->zone_size)); + ASSERT(IS_ALIGNED(size, zinfo->zone_size)); + + if (begin + nbits > zinfo->nr_zones) + return -ERANGE; + + /* All the zones are conventional */ + if (bitmap_test_range_all_zero(zinfo->seq_zones, begin, nbits)) + return 0; + + /* All the zones are sequential and empty */ + if (bitmap_test_range_all_set(zinfo->seq_zones, begin, nbits) && + bitmap_test_range_all_set(zinfo->empty_zones, begin, nbits)) + return 0; + + for (pos = start; pos < start + size; pos += zinfo->zone_size) { + u64 reset_bytes; + + if (!btrfs_dev_is_sequential(device, pos) || + btrfs_dev_is_empty_zone(device, pos)) + continue; + + /* Free regions should be empty */ + btrfs_warn_in_rcu( + device->fs_info, + "zoned: resetting device %s (devid %llu) zone %llu for allocation", + rcu_str_deref(device->name), device->devid, pos >> shift); + WARN_ON_ONCE(1); + + ret = btrfs_reset_device_zone(device, pos, zinfo->zone_size, + &reset_bytes); + if (ret) + return ret; + } + + return 0; +} + +/* + * Calculate an allocation pointer from the extent allocation information + * for a block group consist of conventional zones. It is pointed to the + * end of the highest addressed extent in the block group as an allocation + * offset. + */ +static int calculate_alloc_pointer(struct btrfs_block_group *cache, + u64 *offset_ret, bool new) +{ + struct btrfs_fs_info *fs_info = cache->fs_info; + struct btrfs_root *root; + struct btrfs_path *path; + struct btrfs_key key; + struct btrfs_key found_key; + int ret; + u64 length; + + /* + * Avoid tree lookups for a new block group, there's no use for it. + * It must always be 0. + * + * Also, we have a lock chain of extent buffer lock -> chunk mutex. + * For new a block group, this function is called from + * btrfs_make_block_group() which is already taking the chunk mutex. + * Thus, we cannot call calculate_alloc_pointer() which takes extent + * buffer locks to avoid deadlock. + */ + if (new) { + *offset_ret = 0; + return 0; + } + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + key.objectid = cache->start + cache->length; + key.type = 0; + key.offset = 0; + + root = btrfs_extent_root(fs_info, key.objectid); + ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); + /* We should not find the exact match */ + if (!ret) + ret = -EUCLEAN; + if (ret < 0) + goto out; + + ret = btrfs_previous_extent_item(root, path, cache->start); + if (ret) { + if (ret == 1) { + ret = 0; + *offset_ret = 0; + } + goto out; + } + + btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); + + if (found_key.type == BTRFS_EXTENT_ITEM_KEY) + length = found_key.offset; + else + length = fs_info->nodesize; + + if (!(found_key.objectid >= cache->start && + found_key.objectid + length <= cache->start + cache->length)) { + ret = -EUCLEAN; + goto out; + } + *offset_ret = found_key.objectid + length - cache->start; + ret = 0; + +out: + btrfs_free_path(path); + return ret; +} + +int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new) +{ + struct btrfs_fs_info *fs_info = cache->fs_info; + struct extent_map_tree *em_tree = &fs_info->mapping_tree; + struct extent_map *em; + struct map_lookup *map; + struct btrfs_device *device; + u64 logical = cache->start; + u64 length = cache->length; + int ret; + int i; + unsigned int nofs_flag; + u64 *alloc_offsets = NULL; + u64 *caps = NULL; + u64 *physical = NULL; + unsigned long *active = NULL; + u64 last_alloc = 0; + u32 num_sequential = 0, num_conventional = 0; + + if (!btrfs_is_zoned(fs_info)) + return 0; + + /* Sanity check */ + if (!IS_ALIGNED(length, fs_info->zone_size)) { + btrfs_err(fs_info, + "zoned: block group %llu len %llu unaligned to zone size %llu", + logical, length, fs_info->zone_size); + return -EIO; + } + + /* Get the chunk mapping */ + read_lock(&em_tree->lock); + em = lookup_extent_mapping(em_tree, logical, length); + read_unlock(&em_tree->lock); + + if (!em) + return -EINVAL; + + map = em->map_lookup; + + cache->physical_map = kmemdup(map, map_lookup_size(map->num_stripes), GFP_NOFS); + if (!cache->physical_map) { + ret = -ENOMEM; + goto out; + } + + alloc_offsets = kcalloc(map->num_stripes, sizeof(*alloc_offsets), GFP_NOFS); + if (!alloc_offsets) { + ret = -ENOMEM; + goto out; + } + + caps = kcalloc(map->num_stripes, sizeof(*caps), GFP_NOFS); + if (!caps) { + ret = -ENOMEM; + goto out; + } + + physical = kcalloc(map->num_stripes, sizeof(*physical), GFP_NOFS); + if (!physical) { + ret = -ENOMEM; + goto out; + } + + active = bitmap_zalloc(map->num_stripes, GFP_NOFS); + if (!active) { + ret = -ENOMEM; + goto out; + } + + for (i = 0; i < map->num_stripes; i++) { + bool is_sequential; + struct blk_zone zone; + struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; + int dev_replace_is_ongoing = 0; + + device = map->stripes[i].dev; + physical[i] = map->stripes[i].physical; + + if (device->bdev == NULL) { + alloc_offsets[i] = WP_MISSING_DEV; + continue; + } + + is_sequential = btrfs_dev_is_sequential(device, physical[i]); + if (is_sequential) + num_sequential++; + else + num_conventional++; + + /* + * Consider a zone as active if we can allow any number of + * active zones. + */ + if (!device->zone_info->max_active_zones) + __set_bit(i, active); + + if (!is_sequential) { + alloc_offsets[i] = WP_CONVENTIONAL; + continue; + } + + /* + * This zone will be used for allocation, so mark this zone + * non-empty. + */ + btrfs_dev_clear_zone_empty(device, physical[i]); + + down_read(&dev_replace->rwsem); + dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace); + if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL) + btrfs_dev_clear_zone_empty(dev_replace->tgtdev, physical[i]); + up_read(&dev_replace->rwsem); + + /* + * The group is mapped to a sequential zone. Get the zone write + * pointer to determine the allocation offset within the zone. + */ + WARN_ON(!IS_ALIGNED(physical[i], fs_info->zone_size)); + nofs_flag = memalloc_nofs_save(); + ret = btrfs_get_dev_zone(device, physical[i], &zone); + memalloc_nofs_restore(nofs_flag); + if (ret == -EIO || ret == -EOPNOTSUPP) { + ret = 0; + alloc_offsets[i] = WP_MISSING_DEV; + continue; + } else if (ret) { + goto out; + } + + if (zone.type == BLK_ZONE_TYPE_CONVENTIONAL) { + btrfs_err_in_rcu(fs_info, + "zoned: unexpected conventional zone %llu on device %s (devid %llu)", + zone.start << SECTOR_SHIFT, + rcu_str_deref(device->name), device->devid); + ret = -EIO; + goto out; + } + + caps[i] = (zone.capacity << SECTOR_SHIFT); + + switch (zone.cond) { + case BLK_ZONE_COND_OFFLINE: + case BLK_ZONE_COND_READONLY: + btrfs_err(fs_info, + "zoned: offline/readonly zone %llu on device %s (devid %llu)", + physical[i] >> device->zone_info->zone_size_shift, + rcu_str_deref(device->name), device->devid); + alloc_offsets[i] = WP_MISSING_DEV; + break; + case BLK_ZONE_COND_EMPTY: + alloc_offsets[i] = 0; + break; + case BLK_ZONE_COND_FULL: + alloc_offsets[i] = caps[i]; + break; + default: + /* Partially used zone */ + alloc_offsets[i] = + ((zone.wp - zone.start) << SECTOR_SHIFT); + __set_bit(i, active); + break; + } + } + + if (num_sequential > 0) + set_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags); + + if (num_conventional > 0) { + /* Zone capacity is always zone size in emulation */ + cache->zone_capacity = cache->length; + ret = calculate_alloc_pointer(cache, &last_alloc, new); + if (ret) { + btrfs_err(fs_info, + "zoned: failed to determine allocation offset of bg %llu", + cache->start); + goto out; + } else if (map->num_stripes == num_conventional) { + cache->alloc_offset = last_alloc; + set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags); + goto out; + } + } + + switch (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) { + case 0: /* single */ + if (alloc_offsets[0] == WP_MISSING_DEV) { + btrfs_err(fs_info, + "zoned: cannot recover write pointer for zone %llu", + physical[0]); + ret = -EIO; + goto out; + } + cache->alloc_offset = alloc_offsets[0]; + cache->zone_capacity = caps[0]; + if (test_bit(0, active)) + set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags); + break; + case BTRFS_BLOCK_GROUP_DUP: + if (map->type & BTRFS_BLOCK_GROUP_DATA) { + btrfs_err(fs_info, "zoned: profile DUP not yet supported on data bg"); + ret = -EINVAL; + goto out; + } + if (alloc_offsets[0] == WP_MISSING_DEV) { + btrfs_err(fs_info, + "zoned: cannot recover write pointer for zone %llu", + physical[0]); + ret = -EIO; + goto out; + } + if (alloc_offsets[1] == WP_MISSING_DEV) { + btrfs_err(fs_info, + "zoned: cannot recover write pointer for zone %llu", + physical[1]); + ret = -EIO; + goto out; + } + if (alloc_offsets[0] != alloc_offsets[1]) { + btrfs_err(fs_info, + "zoned: write pointer offset mismatch of zones in DUP profile"); + ret = -EIO; + goto out; + } + if (test_bit(0, active) != test_bit(1, active)) { + if (!btrfs_zone_activate(cache)) { + ret = -EIO; + goto out; + } + } else { + if (test_bit(0, active)) + set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, + &cache->runtime_flags); + } + cache->alloc_offset = alloc_offsets[0]; + cache->zone_capacity = min(caps[0], caps[1]); + break; + case BTRFS_BLOCK_GROUP_RAID1: + case BTRFS_BLOCK_GROUP_RAID0: + case BTRFS_BLOCK_GROUP_RAID10: + case BTRFS_BLOCK_GROUP_RAID5: + case BTRFS_BLOCK_GROUP_RAID6: + /* non-single profiles are not supported yet */ + default: + btrfs_err(fs_info, "zoned: profile %s not yet supported", + btrfs_bg_type_to_raid_name(map->type)); + ret = -EINVAL; + goto out; + } + +out: + if (cache->alloc_offset > fs_info->zone_size) { + btrfs_err(fs_info, + "zoned: invalid write pointer %llu in block group %llu", + cache->alloc_offset, cache->start); + ret = -EIO; + } + + if (cache->alloc_offset > cache->zone_capacity) { + btrfs_err(fs_info, +"zoned: invalid write pointer %llu (larger than zone capacity %llu) in block group %llu", + cache->alloc_offset, cache->zone_capacity, + cache->start); + ret = -EIO; + } + + /* An extent is allocated after the write pointer */ + if (!ret && num_conventional && last_alloc > cache->alloc_offset) { + btrfs_err(fs_info, + "zoned: got wrong write pointer in BG %llu: %llu > %llu", + logical, last_alloc, cache->alloc_offset); + ret = -EIO; + } + + if (!ret) { + cache->meta_write_pointer = cache->alloc_offset + cache->start; + if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags)) { + btrfs_get_block_group(cache); + spin_lock(&fs_info->zone_active_bgs_lock); + list_add_tail(&cache->active_bg_list, + &fs_info->zone_active_bgs); + spin_unlock(&fs_info->zone_active_bgs_lock); + } + } else { + kfree(cache->physical_map); + cache->physical_map = NULL; + } + bitmap_free(active); + kfree(physical); + kfree(caps); + kfree(alloc_offsets); + free_extent_map(em); + + return ret; +} + +void btrfs_calc_zone_unusable(struct btrfs_block_group *cache) +{ + u64 unusable, free; + + if (!btrfs_is_zoned(cache->fs_info)) + return; + + WARN_ON(cache->bytes_super != 0); + unusable = (cache->alloc_offset - cache->used) + + (cache->length - cache->zone_capacity); + free = cache->zone_capacity - cache->alloc_offset; + + /* We only need ->free_space in ALLOC_SEQ block groups */ + cache->cached = BTRFS_CACHE_FINISHED; + cache->free_space_ctl->free_space = free; + cache->zone_unusable = unusable; +} + +void btrfs_redirty_list_add(struct btrfs_transaction *trans, + struct extent_buffer *eb) +{ + if (!btrfs_is_zoned(eb->fs_info) || + btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN)) + return; + + ASSERT(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); + + memzero_extent_buffer(eb, 0, eb->len); + set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags); + set_extent_buffer_dirty(eb); + set_extent_bit(&trans->dirty_pages, eb->start, eb->start + eb->len - 1, + EXTENT_DIRTY | EXTENT_NOWAIT, NULL); +} + +bool btrfs_use_zone_append(struct btrfs_bio *bbio) +{ + u64 start = (bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT); + struct btrfs_inode *inode = bbio->inode; + struct btrfs_fs_info *fs_info = bbio->fs_info; + struct btrfs_block_group *cache; + bool ret = false; + + if (!btrfs_is_zoned(fs_info)) + return false; + + if (!inode || !is_data_inode(&inode->vfs_inode)) + return false; + + if (btrfs_op(&bbio->bio) != BTRFS_MAP_WRITE) + return false; + + /* + * Using REQ_OP_ZONE_APPNED for relocation can break assumptions on the + * extent layout the relocation code has. + * Furthermore we have set aside own block-group from which only the + * relocation "process" can allocate and make sure only one process at a + * time can add pages to an extent that gets relocated, so it's safe to + * use regular REQ_OP_WRITE for this special case. + */ + if (btrfs_is_data_reloc_root(inode->root)) + return false; + + cache = btrfs_lookup_block_group(fs_info, start); + ASSERT(cache); + if (!cache) + return false; + + ret = !!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags); + btrfs_put_block_group(cache); + + return ret; +} + +void btrfs_record_physical_zoned(struct btrfs_bio *bbio) +{ + const u64 physical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT; + struct btrfs_ordered_sum *sum = bbio->sums; + + if (physical < bbio->orig_physical) + sum->logical -= bbio->orig_physical - physical; + else + sum->logical += physical - bbio->orig_physical; +} + +static void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered, + u64 logical) +{ + struct extent_map_tree *em_tree = &BTRFS_I(ordered->inode)->extent_tree; + struct extent_map *em; + + ordered->disk_bytenr = logical; + + write_lock(&em_tree->lock); + em = search_extent_mapping(em_tree, ordered->file_offset, + ordered->num_bytes); + em->block_start = logical; + free_extent_map(em); + write_unlock(&em_tree->lock); +} + +static bool btrfs_zoned_split_ordered(struct btrfs_ordered_extent *ordered, + u64 logical, u64 len) +{ + struct btrfs_ordered_extent *new; + + if (!test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags) && + split_extent_map(BTRFS_I(ordered->inode), ordered->file_offset, + ordered->num_bytes, len, logical)) + return false; + + new = btrfs_split_ordered_extent(ordered, len); + if (IS_ERR(new)) + return false; + new->disk_bytenr = logical; + btrfs_finish_one_ordered(new); + return true; +} + +void btrfs_finish_ordered_zoned(struct btrfs_ordered_extent *ordered) +{ + struct btrfs_inode *inode = BTRFS_I(ordered->inode); + struct btrfs_fs_info *fs_info = inode->root->fs_info; + struct btrfs_ordered_sum *sum; + u64 logical, len; + + /* + * Write to pre-allocated region is for the data relocation, and so + * it should use WRITE operation. No split/rewrite are necessary. + */ + if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) + return; + + ASSERT(!list_empty(&ordered->list)); + /* The ordered->list can be empty in the above pre-alloc case. */ + sum = list_first_entry(&ordered->list, struct btrfs_ordered_sum, list); + logical = sum->logical; + len = sum->len; + + while (len < ordered->disk_num_bytes) { + sum = list_next_entry(sum, list); + if (sum->logical == logical + len) { + len += sum->len; + continue; + } + if (!btrfs_zoned_split_ordered(ordered, logical, len)) { + set_bit(BTRFS_ORDERED_IOERR, &ordered->flags); + btrfs_err(fs_info, "failed to split ordered extent"); + goto out; + } + logical = sum->logical; + len = sum->len; + } + + if (ordered->disk_bytenr != logical) + btrfs_rewrite_logical_zoned(ordered, logical); + +out: + /* + * If we end up here for nodatasum I/O, the btrfs_ordered_sum structures + * were allocated by btrfs_alloc_dummy_sum only to record the logical + * addresses and don't contain actual checksums. We thus must free them + * here so that we don't attempt to log the csums later. + */ + if ((inode->flags & BTRFS_INODE_NODATASUM) || + test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state)) { + while ((sum = list_first_entry_or_null(&ordered->list, + typeof(*sum), list))) { + list_del(&sum->list); + kfree(sum); + } + } +} + +static bool check_bg_is_active(struct btrfs_eb_write_context *ctx, + struct btrfs_block_group **active_bg) +{ + const struct writeback_control *wbc = ctx->wbc; + struct btrfs_block_group *block_group = ctx->zoned_bg; + struct btrfs_fs_info *fs_info = block_group->fs_info; + + if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) + return true; + + if (fs_info->treelog_bg == block_group->start) { + if (!btrfs_zone_activate(block_group)) { + int ret_fin = btrfs_zone_finish_one_bg(fs_info); + + if (ret_fin != 1 || !btrfs_zone_activate(block_group)) + return false; + } + } else if (*active_bg != block_group) { + struct btrfs_block_group *tgt = *active_bg; + + /* zoned_meta_io_lock protects fs_info->active_{meta,system}_bg. */ + lockdep_assert_held(&fs_info->zoned_meta_io_lock); + + if (tgt) { + /* + * If there is an unsent IO left in the allocated area, + * we cannot wait for them as it may cause a deadlock. + */ + if (tgt->meta_write_pointer < tgt->start + tgt->alloc_offset) { + if (wbc->sync_mode == WB_SYNC_NONE || + (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)) + return false; + } + + /* Pivot active metadata/system block group. */ + btrfs_zoned_meta_io_unlock(fs_info); + wait_eb_writebacks(tgt); + do_zone_finish(tgt, true); + btrfs_zoned_meta_io_lock(fs_info); + if (*active_bg == tgt) { + btrfs_put_block_group(tgt); + *active_bg = NULL; + } + } + if (!btrfs_zone_activate(block_group)) + return false; + if (*active_bg != block_group) { + ASSERT(*active_bg == NULL); + *active_bg = block_group; + btrfs_get_block_group(block_group); + } + } + + return true; +} + +/* + * Check if @ctx->eb is aligned to the write pointer. + * + * Return: + * 0: @ctx->eb is at the write pointer. You can write it. + * -EAGAIN: There is a hole. The caller should handle the case. + * -EBUSY: There is a hole, but the caller can just bail out. + */ +int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info, + struct btrfs_eb_write_context *ctx) +{ + const struct writeback_control *wbc = ctx->wbc; + const struct extent_buffer *eb = ctx->eb; + struct btrfs_block_group *block_group = ctx->zoned_bg; + + if (!btrfs_is_zoned(fs_info)) + return 0; + + if (block_group) { + if (block_group->start > eb->start || + block_group->start + block_group->length <= eb->start) { + btrfs_put_block_group(block_group); + block_group = NULL; + ctx->zoned_bg = NULL; + } + } + + if (!block_group) { + block_group = btrfs_lookup_block_group(fs_info, eb->start); + if (!block_group) + return 0; + ctx->zoned_bg = block_group; + } + + if (block_group->meta_write_pointer == eb->start) { + struct btrfs_block_group **tgt; + + if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags)) + return 0; + + if (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM) + tgt = &fs_info->active_system_bg; + else + tgt = &fs_info->active_meta_bg; + if (check_bg_is_active(ctx, tgt)) + return 0; + } + + /* + * Since we may release fs_info->zoned_meta_io_lock, someone can already + * start writing this eb. In that case, we can just bail out. + */ + if (block_group->meta_write_pointer > eb->start) + return -EBUSY; + + /* If for_sync, this hole will be filled with trasnsaction commit. */ + if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync) + return -EAGAIN; + return -EBUSY; +} + +int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length) +{ + if (!btrfs_dev_is_sequential(device, physical)) + return -EOPNOTSUPP; + + return blkdev_issue_zeroout(device->bdev, physical >> SECTOR_SHIFT, + length >> SECTOR_SHIFT, GFP_NOFS, 0); +} + +static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical, + struct blk_zone *zone) +{ + struct btrfs_io_context *bioc = NULL; + u64 mapped_length = PAGE_SIZE; + unsigned int nofs_flag; + int nmirrors; + int i, ret; + + ret = btrfs_map_block(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical, + &mapped_length, &bioc, NULL, NULL, 1); + if (ret || !bioc || mapped_length < PAGE_SIZE) { + ret = -EIO; + goto out_put_bioc; + } + + if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) { + ret = -EINVAL; + goto out_put_bioc; + } + + nofs_flag = memalloc_nofs_save(); + nmirrors = (int)bioc->num_stripes; + for (i = 0; i < nmirrors; i++) { + u64 physical = bioc->stripes[i].physical; + struct btrfs_device *dev = bioc->stripes[i].dev; + + /* Missing device */ + if (!dev->bdev) + continue; + + ret = btrfs_get_dev_zone(dev, physical, zone); + /* Failing device */ + if (ret == -EIO || ret == -EOPNOTSUPP) + continue; + break; + } + memalloc_nofs_restore(nofs_flag); +out_put_bioc: + btrfs_put_bioc(bioc); + return ret; +} + +/* + * Synchronize write pointer in a zone at @physical_start on @tgt_dev, by + * filling zeros between @physical_pos to a write pointer of dev-replace + * source device. + */ +int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical, + u64 physical_start, u64 physical_pos) +{ + struct btrfs_fs_info *fs_info = tgt_dev->fs_info; + struct blk_zone zone; + u64 length; + u64 wp; + int ret; + + if (!btrfs_dev_is_sequential(tgt_dev, physical_pos)) + return 0; + + ret = read_zone_info(fs_info, logical, &zone); + if (ret) + return ret; + + wp = physical_start + ((zone.wp - zone.start) << SECTOR_SHIFT); + + if (physical_pos == wp) + return 0; + + if (physical_pos > wp) + return -EUCLEAN; + + length = wp - physical_pos; + return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length); +} + +/* + * Activate block group and underlying device zones + * + * @block_group: the block group to activate + * + * Return: true on success, false otherwise + */ +bool btrfs_zone_activate(struct btrfs_block_group *block_group) +{ + struct btrfs_fs_info *fs_info = block_group->fs_info; + struct map_lookup *map; + struct btrfs_device *device; + u64 physical; + const bool is_data = (block_group->flags & BTRFS_BLOCK_GROUP_DATA); + bool ret; + int i; + + if (!btrfs_is_zoned(block_group->fs_info)) + return true; + + map = block_group->physical_map; + + spin_lock(&fs_info->zone_active_bgs_lock); + spin_lock(&block_group->lock); + if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) { + ret = true; + goto out_unlock; + } + + /* No space left */ + if (btrfs_zoned_bg_is_full(block_group)) { + ret = false; + goto out_unlock; + } + + for (i = 0; i < map->num_stripes; i++) { + struct btrfs_zoned_device_info *zinfo; + int reserved = 0; + + device = map->stripes[i].dev; + physical = map->stripes[i].physical; + zinfo = device->zone_info; + + if (zinfo->max_active_zones == 0) + continue; + + if (is_data) + reserved = zinfo->reserved_active_zones; + /* + * For the data block group, leave active zones for one + * metadata block group and one system block group. + */ + if (atomic_read(&zinfo->active_zones_left) <= reserved) { + ret = false; + goto out_unlock; + } + + if (!btrfs_dev_set_active_zone(device, physical)) { + /* Cannot activate the zone */ + ret = false; + goto out_unlock; + } + if (!is_data) + zinfo->reserved_active_zones--; + } + + /* Successfully activated all the zones */ + set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags); + spin_unlock(&block_group->lock); + + /* For the active block group list */ + btrfs_get_block_group(block_group); + list_add_tail(&block_group->active_bg_list, &fs_info->zone_active_bgs); + spin_unlock(&fs_info->zone_active_bgs_lock); + + return true; + +out_unlock: + spin_unlock(&block_group->lock); + spin_unlock(&fs_info->zone_active_bgs_lock); + return ret; +} + +static void wait_eb_writebacks(struct btrfs_block_group *block_group) +{ + struct btrfs_fs_info *fs_info = block_group->fs_info; + const u64 end = block_group->start + block_group->length; + struct radix_tree_iter iter; + struct extent_buffer *eb; + void __rcu **slot; + + rcu_read_lock(); + radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter, + block_group->start >> fs_info->sectorsize_bits) { + eb = radix_tree_deref_slot(slot); + if (!eb) + continue; + if (radix_tree_deref_retry(eb)) { + slot = radix_tree_iter_retry(&iter); + continue; + } + + if (eb->start < block_group->start) + continue; + if (eb->start >= end) + break; + + slot = radix_tree_iter_resume(slot, &iter); + rcu_read_unlock(); + wait_on_extent_buffer_writeback(eb); + rcu_read_lock(); + } + rcu_read_unlock(); +} + +static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written) +{ + struct btrfs_fs_info *fs_info = block_group->fs_info; + struct map_lookup *map; + const bool is_metadata = (block_group->flags & + (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM)); + int ret = 0; + int i; + + spin_lock(&block_group->lock); + if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) { + spin_unlock(&block_group->lock); + return 0; + } + + /* Check if we have unwritten allocated space */ + if (is_metadata && + block_group->start + block_group->alloc_offset > block_group->meta_write_pointer) { + spin_unlock(&block_group->lock); + return -EAGAIN; + } + + /* + * If we are sure that the block group is full (= no more room left for + * new allocation) and the IO for the last usable block is completed, we + * don't need to wait for the other IOs. This holds because we ensure + * the sequential IO submissions using the ZONE_APPEND command for data + * and block_group->meta_write_pointer for metadata. + */ + if (!fully_written) { + if (test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) { + spin_unlock(&block_group->lock); + return -EAGAIN; + } + spin_unlock(&block_group->lock); + + ret = btrfs_inc_block_group_ro(block_group, false); + if (ret) + return ret; + + /* Ensure all writes in this block group finish */ + btrfs_wait_block_group_reservations(block_group); + /* No need to wait for NOCOW writers. Zoned mode does not allow that */ + btrfs_wait_ordered_roots(fs_info, U64_MAX, block_group->start, + block_group->length); + /* Wait for extent buffers to be written. */ + if (is_metadata) + wait_eb_writebacks(block_group); + + spin_lock(&block_group->lock); + + /* + * Bail out if someone already deactivated the block group, or + * allocated space is left in the block group. + */ + if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, + &block_group->runtime_flags)) { + spin_unlock(&block_group->lock); + btrfs_dec_block_group_ro(block_group); + return 0; + } + + if (block_group->reserved || + test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, + &block_group->runtime_flags)) { + spin_unlock(&block_group->lock); + btrfs_dec_block_group_ro(block_group); + return -EAGAIN; + } + } + + clear_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags); + block_group->alloc_offset = block_group->zone_capacity; + if (block_group->flags & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM)) + block_group->meta_write_pointer = block_group->start + + block_group->zone_capacity; + block_group->free_space_ctl->free_space = 0; + btrfs_clear_treelog_bg(block_group); + btrfs_clear_data_reloc_bg(block_group); + spin_unlock(&block_group->lock); + + map = block_group->physical_map; + for (i = 0; i < map->num_stripes; i++) { + struct btrfs_device *device = map->stripes[i].dev; + const u64 physical = map->stripes[i].physical; + struct btrfs_zoned_device_info *zinfo = device->zone_info; + + if (zinfo->max_active_zones == 0) + continue; + + ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_FINISH, + physical >> SECTOR_SHIFT, + zinfo->zone_size >> SECTOR_SHIFT, + GFP_NOFS); + + if (ret) + return ret; + + if (!(block_group->flags & BTRFS_BLOCK_GROUP_DATA)) + zinfo->reserved_active_zones++; + btrfs_dev_clear_active_zone(device, physical); + } + + if (!fully_written) + btrfs_dec_block_group_ro(block_group); + + spin_lock(&fs_info->zone_active_bgs_lock); + ASSERT(!list_empty(&block_group->active_bg_list)); + list_del_init(&block_group->active_bg_list); + spin_unlock(&fs_info->zone_active_bgs_lock); + + /* For active_bg_list */ + btrfs_put_block_group(block_group); + + clear_and_wake_up_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags); + + return 0; +} + +int btrfs_zone_finish(struct btrfs_block_group *block_group) +{ + if (!btrfs_is_zoned(block_group->fs_info)) + return 0; + + return do_zone_finish(block_group, false); +} + +bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags) +{ + struct btrfs_fs_info *fs_info = fs_devices->fs_info; + struct btrfs_device *device; + bool ret = false; + + if (!btrfs_is_zoned(fs_info)) + return true; + + /* Check if there is a device with active zones left */ + mutex_lock(&fs_info->chunk_mutex); + spin_lock(&fs_info->zone_active_bgs_lock); + list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { + struct btrfs_zoned_device_info *zinfo = device->zone_info; + int reserved = 0; + + if (!device->bdev) + continue; + + if (!zinfo->max_active_zones) { + ret = true; + break; + } + + if (flags & BTRFS_BLOCK_GROUP_DATA) + reserved = zinfo->reserved_active_zones; + + switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) { + case 0: /* single */ + ret = (atomic_read(&zinfo->active_zones_left) >= (1 + reserved)); + break; + case BTRFS_BLOCK_GROUP_DUP: + ret = (atomic_read(&zinfo->active_zones_left) >= (2 + reserved)); + break; + } + if (ret) + break; + } + spin_unlock(&fs_info->zone_active_bgs_lock); + mutex_unlock(&fs_info->chunk_mutex); + + if (!ret) + set_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags); + + return ret; +} + +void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical, u64 length) +{ + struct btrfs_block_group *block_group; + u64 min_alloc_bytes; + + if (!btrfs_is_zoned(fs_info)) + return; + + block_group = btrfs_lookup_block_group(fs_info, logical); + ASSERT(block_group); + + /* No MIXED_BG on zoned btrfs. */ + if (block_group->flags & BTRFS_BLOCK_GROUP_DATA) + min_alloc_bytes = fs_info->sectorsize; + else + min_alloc_bytes = fs_info->nodesize; + + /* Bail out if we can allocate more data from this block group. */ + if (logical + length + min_alloc_bytes <= + block_group->start + block_group->zone_capacity) + goto out; + + do_zone_finish(block_group, true); + +out: + btrfs_put_block_group(block_group); +} + +static void btrfs_zone_finish_endio_workfn(struct work_struct *work) +{ + struct btrfs_block_group *bg = + container_of(work, struct btrfs_block_group, zone_finish_work); + + wait_on_extent_buffer_writeback(bg->last_eb); + free_extent_buffer(bg->last_eb); + btrfs_zone_finish_endio(bg->fs_info, bg->start, bg->length); + btrfs_put_block_group(bg); +} + +void btrfs_schedule_zone_finish_bg(struct btrfs_block_group *bg, + struct extent_buffer *eb) +{ + if (!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &bg->runtime_flags) || + eb->start + eb->len * 2 <= bg->start + bg->zone_capacity) + return; + + if (WARN_ON(bg->zone_finish_work.func == btrfs_zone_finish_endio_workfn)) { + btrfs_err(bg->fs_info, "double scheduling of bg %llu zone finishing", + bg->start); + return; + } + + /* For the work */ + btrfs_get_block_group(bg); + atomic_inc(&eb->refs); + bg->last_eb = eb; + INIT_WORK(&bg->zone_finish_work, btrfs_zone_finish_endio_workfn); + queue_work(system_unbound_wq, &bg->zone_finish_work); +} + +void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg) +{ + struct btrfs_fs_info *fs_info = bg->fs_info; + + spin_lock(&fs_info->relocation_bg_lock); + if (fs_info->data_reloc_bg == bg->start) + fs_info->data_reloc_bg = 0; + spin_unlock(&fs_info->relocation_bg_lock); +} + +void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info) +{ + struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; + struct btrfs_device *device; + + if (!btrfs_is_zoned(fs_info)) + return; + + mutex_lock(&fs_devices->device_list_mutex); + list_for_each_entry(device, &fs_devices->devices, dev_list) { + if (device->zone_info) { + vfree(device->zone_info->zone_cache); + device->zone_info->zone_cache = NULL; + } + } + mutex_unlock(&fs_devices->device_list_mutex); +} + +bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info) +{ + struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; + struct btrfs_device *device; + u64 used = 0; + u64 total = 0; + u64 factor; + + ASSERT(btrfs_is_zoned(fs_info)); + + if (fs_info->bg_reclaim_threshold == 0) + return false; + + mutex_lock(&fs_devices->device_list_mutex); + list_for_each_entry(device, &fs_devices->devices, dev_list) { + if (!device->bdev) + continue; + + total += device->disk_total_bytes; + used += device->bytes_used; + } + mutex_unlock(&fs_devices->device_list_mutex); + + factor = div64_u64(used * 100, total); + return factor >= fs_info->bg_reclaim_threshold; +} + +void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical, + u64 length) +{ + struct btrfs_block_group *block_group; + + if (!btrfs_is_zoned(fs_info)) + return; + + block_group = btrfs_lookup_block_group(fs_info, logical); + /* It should be called on a previous data relocation block group. */ + ASSERT(block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)); + + spin_lock(&block_group->lock); + if (!test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) + goto out; + + /* All relocation extents are written. */ + if (block_group->start + block_group->alloc_offset == logical + length) { + /* + * Now, release this block group for further allocations and + * zone finish. + */ + clear_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, + &block_group->runtime_flags); + } + +out: + spin_unlock(&block_group->lock); + btrfs_put_block_group(block_group); +} + +int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info) +{ + struct btrfs_block_group *block_group; + struct btrfs_block_group *min_bg = NULL; + u64 min_avail = U64_MAX; + int ret; + + spin_lock(&fs_info->zone_active_bgs_lock); + list_for_each_entry(block_group, &fs_info->zone_active_bgs, + active_bg_list) { + u64 avail; + + spin_lock(&block_group->lock); + if (block_group->reserved || block_group->alloc_offset == 0 || + (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM) || + test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) { + spin_unlock(&block_group->lock); + continue; + } + + avail = block_group->zone_capacity - block_group->alloc_offset; + if (min_avail > avail) { + if (min_bg) + btrfs_put_block_group(min_bg); + min_bg = block_group; + min_avail = avail; + btrfs_get_block_group(min_bg); + } + spin_unlock(&block_group->lock); + } + spin_unlock(&fs_info->zone_active_bgs_lock); + + if (!min_bg) + return 0; + + ret = btrfs_zone_finish(min_bg); + btrfs_put_block_group(min_bg); + + return ret < 0 ? ret : 1; +} + +int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info, + struct btrfs_space_info *space_info, + bool do_finish) +{ + struct btrfs_block_group *bg; + int index; + + if (!btrfs_is_zoned(fs_info) || (space_info->flags & BTRFS_BLOCK_GROUP_DATA)) + return 0; + + for (;;) { + int ret; + bool need_finish = false; + + down_read(&space_info->groups_sem); + for (index = 0; index < BTRFS_NR_RAID_TYPES; index++) { + list_for_each_entry(bg, &space_info->block_groups[index], + list) { + if (!spin_trylock(&bg->lock)) + continue; + if (btrfs_zoned_bg_is_full(bg) || + test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, + &bg->runtime_flags)) { + spin_unlock(&bg->lock); + continue; + } + spin_unlock(&bg->lock); + + if (btrfs_zone_activate(bg)) { + up_read(&space_info->groups_sem); + return 1; + } + + need_finish = true; + } + } + up_read(&space_info->groups_sem); + + if (!do_finish || !need_finish) + break; + + ret = btrfs_zone_finish_one_bg(fs_info); + if (ret == 0) + break; + if (ret < 0) + return ret; + } + + return 0; +} + +/* + * Reserve zones for one metadata block group, one tree-log block group, and one + * system block group. + */ +void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info) +{ + struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; + struct btrfs_block_group *block_group; + struct btrfs_device *device; + /* Reserve zones for normal SINGLE metadata and tree-log block group. */ + unsigned int metadata_reserve = 2; + /* Reserve a zone for SINGLE system block group. */ + unsigned int system_reserve = 1; + + if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags)) + return; + + /* + * This function is called from the mount context. So, there is no + * parallel process touching the bits. No need for read_seqretry(). + */ + if (fs_info->avail_metadata_alloc_bits & BTRFS_BLOCK_GROUP_DUP) + metadata_reserve = 4; + if (fs_info->avail_system_alloc_bits & BTRFS_BLOCK_GROUP_DUP) + system_reserve = 2; + + /* Apply the reservation on all the devices. */ + mutex_lock(&fs_devices->device_list_mutex); + list_for_each_entry(device, &fs_devices->devices, dev_list) { + if (!device->bdev) + continue; + + device->zone_info->reserved_active_zones = + metadata_reserve + system_reserve; + } + mutex_unlock(&fs_devices->device_list_mutex); + + /* Release reservation for currently active block groups. */ + spin_lock(&fs_info->zone_active_bgs_lock); + list_for_each_entry(block_group, &fs_info->zone_active_bgs, active_bg_list) { + struct map_lookup *map = block_group->physical_map; + + if (!(block_group->flags & + (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))) + continue; + + for (int i = 0; i < map->num_stripes; i++) + map->stripes[i].dev->zone_info->reserved_active_zones--; + } + spin_unlock(&fs_info->zone_active_bgs_lock); +} |