// SPDX-License-Identifier: GPL-2.0 /* * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License v2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include #include #include "kernel-lib/list.h" #include "kernel-shared/volumes.h" #include "kernel-shared/zoned.h" #include "common/utils.h" #include "common/device-utils.h" #include "common/messages.h" #include "mkfs/common.h" /* Maximum number of zones to report per ioctl(BLKREPORTZONE) 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) #define EMULATED_ZONE_SIZE SZ_256M static int btrfs_get_dev_zone_info(struct btrfs_device *device); enum btrfs_zoned_model zoned_model(const char *file) { const char host_aware[] = "host-aware"; const char host_managed[] = "host-managed"; struct stat st; char model[32]; int ret; ret = stat(file, &st); if (ret < 0) { error("zoned: unable to stat %s", file); return -ENOENT; } /* Consider a regular file as non-zoned device */ if (!S_ISBLK(st.st_mode)) return ZONED_NONE; ret = device_get_queue_param(file, "zoned", model, sizeof(model)); if (ret <= 0) return ZONED_NONE; if (strncmp(model, host_aware, strlen(host_aware)) == 0) return ZONED_HOST_AWARE; if (strncmp(model, host_managed, strlen(host_managed)) == 0) return ZONED_HOST_MANAGED; return ZONED_NONE; } u64 zone_size(const char *file) { char chunk[32]; int ret; /* Zoned emulation on regular device */ if (zoned_model(file) == ZONED_NONE) return EMULATED_ZONE_SIZE; ret = device_get_queue_param(file, "chunk_sectors", chunk, sizeof(chunk)); if (ret <= 0) return 0; return strtoull((const char *)chunk, NULL, 10) << SECTOR_SHIFT; } u64 max_zone_append_size(const char *file) { char chunk[32]; int ret; ret = device_get_queue_param(file, "zone_append_max_bytes", chunk, sizeof(chunk)); if (ret <= 0) return 0; return strtoull((const char *)chunk, NULL, 10); } #ifdef BTRFS_ZONED /* * Emulate blkdev_report_zones() for a non-zoned device. It slices up the block * device into fixed-sized chunks and emulate a conventional zone on each of * them. */ static int emulate_report_zones(const char *file, int fd, u64 pos, struct blk_zone *zones, unsigned int nr_zones) { const sector_t zone_sectors = EMULATED_ZONE_SIZE >> SECTOR_SHIFT; struct stat st; sector_t bdev_size; unsigned int i; int ret; ret = fstat(fd, &st); if (ret < 0) { error("unable to stat %s: %m", file); return -EIO; } bdev_size = btrfs_device_size(fd, &st) >> SECTOR_SHIFT; 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 sb_write_pointer(int fd, struct blk_zone *zones, u64 *wp_ret) { bool empty[BTRFS_NR_SB_LOG_ZONES]; bool full[BTRFS_NR_SB_LOG_ZONES]; sector_t sector; ASSERT(zones[0].type != BLK_ZONE_TYPE_CONVENTIONAL && zones[1].type != BLK_ZONE_TYPE_CONVENTIONAL); empty[0] = (zones[0].cond == BLK_ZONE_COND_EMPTY); empty[1] = (zones[1].cond == BLK_ZONE_COND_EMPTY); full[0] = (zones[0].cond == BLK_ZONE_COND_FULL); full[1] = (zones[1].cond == BLK_ZONE_COND_FULL); /* * Possible states of log buffer zones * * Empty[0] In use[0] Full[0] * Empty[1] * x 0 * In use[1] 0 x 0 * Full[1] 1 1 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 */ u8 buf[BTRFS_NR_SB_LOG_ZONES][BTRFS_SUPER_INFO_SIZE]; struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES]; int i; int ret; for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) { u64 bytenr; bytenr = ((zones[i].start + zones[i].len) << SECTOR_SHIFT) - BTRFS_SUPER_INFO_SIZE; ret = pread64(fd, buf[i], BTRFS_SUPER_INFO_SIZE, bytenr); if (ret != BTRFS_SUPER_INFO_SIZE) return -EIO; super[i] = (struct btrfs_super_block *)&buf[i]; } if (super[0]->generation > super[1]->generation) sector = zones[1].start; else sector = zones[0].start; } 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; } int btrfs_reset_dev_zone(int fd, struct blk_zone *zone) { struct blk_zone_range range; /* Nothing to do if it is already empty */ if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL || zone->cond == BLK_ZONE_COND_EMPTY) return 0; range.sector = zone->start; range.nr_sectors = zone->len; if (ioctl(fd, BLKRESETZONE, &range) < 0) return -errno; zone->cond = BLK_ZONE_COND_EMPTY; zone->wp = zone->start; return 0; } static int report_zones(int fd, const char *file, struct btrfs_zoned_device_info *zinfo) { u64 device_size; u64 zone_bytes = zone_size(file); size_t rep_size; u64 sector = 0; struct stat st; struct blk_zone_report *rep; struct blk_zone *zone; unsigned int i, n = 0; int ret; /* * Zones are guaranteed (by kernel) to be a power of 2 number of * sectors. Check this here and make sure that zones are not too small. */ if (!zone_bytes || !is_power_of_2(zone_bytes)) { error("zoned: illegal zone size %llu (not a power of 2)", zone_bytes); exit(1); } /* * The zone size must be large enough to hold the initial system * block group for mkfs time. */ if (zone_bytes < BTRFS_MKFS_SYSTEM_GROUP_SIZE) { error("zoned: illegal zone size %llu (smaller than %d)", zone_bytes, BTRFS_MKFS_SYSTEM_GROUP_SIZE); exit(1); } ret = fstat(fd, &st); if (ret < 0) { error("error when reading zone info on %s: %m", file); return -EIO; } device_size = btrfs_device_size(fd, &st); if (device_size == 0) { error("zoned: failed to read size of %s: %m", file); exit(1); } /* Allocate the zone information array */ zinfo->zone_size = zone_bytes; zinfo->nr_zones = device_size / zone_bytes; if (device_size & (zone_bytes - 1)) zinfo->nr_zones++; if (zoned_model(file) != ZONED_NONE && max_zone_append_size(file) == 0) { error( "zoned: device %s does not support ZONE_APPEND command", file); exit(1); } zinfo->zones = calloc(zinfo->nr_zones, sizeof(struct blk_zone)); if (!zinfo->zones) { error("zoned: no memory for zone information"); exit(1); } /* Allocate a zone report */ rep_size = sizeof(struct blk_zone_report) + sizeof(struct blk_zone) * BTRFS_REPORT_NR_ZONES; rep = malloc(rep_size); if (!rep) { error("zoned: no memory for zones report"); exit(1); } /* Get zone information */ zone = (struct blk_zone *)(rep + 1); while (n < zinfo->nr_zones) { memset(rep, 0, rep_size); rep->sector = sector; rep->nr_zones = BTRFS_REPORT_NR_ZONES; if (zinfo->model != ZONED_NONE) { ret = ioctl(fd, BLKREPORTZONE, rep); if (ret != 0) { error("zoned: ioctl BLKREPORTZONE failed (%m)"); exit(1); } zinfo->emulated = false; } else { ret = emulate_report_zones(file, fd, sector << SECTOR_SHIFT, zone, BTRFS_REPORT_NR_ZONES); if (ret < 0) { error("zoned: failed to emulate BLKREPORTZONE"); exit(1); } zinfo->emulated = true; } if (!rep->nr_zones) break; for (i = 0; i < rep->nr_zones; i++) { if (n >= zinfo->nr_zones) break; memcpy(&zinfo->zones[n], &zone[i], sizeof(struct blk_zone)); n++; } sector = zone[rep->nr_zones - 1].start + zone[rep->nr_zones - 1].len; } free(rep); return 0; } /* * Discard blocks in the zones of a zoned block device. Process this with zone * size granularity so that blocks in conventional zones are discarded using * discard_range and blocks in sequential zones are reset though a zone reset. */ int btrfs_reset_all_zones(int fd, struct btrfs_zoned_device_info *zinfo) { unsigned int i; int ret = 0; ASSERT(zinfo); /* Zone size granularity */ for (i = 0; i < zinfo->nr_zones; i++) { if (zinfo->zones[i].type == BLK_ZONE_TYPE_CONVENTIONAL) { ret = device_discard_blocks(fd, zinfo->zones[i].start << SECTOR_SHIFT, zinfo->zone_size); if (ret == EOPNOTSUPP) ret = 0; } else if (zinfo->zones[i].cond != BLK_ZONE_COND_EMPTY) { ret = btrfs_reset_dev_zone(fd, &zinfo->zones[i]); } else { ret = 0; } if (ret) return ret; } return fsync(fd); } int zero_zone_blocks(int fd, struct btrfs_zoned_device_info *zinfo, off_t start, size_t len) { size_t zone_len = zinfo->zone_size; off_t ofst = start; size_t count; int ret; /* Make sure that device_zero_blocks does not write sequential zones */ while (len > 0) { /* Limit device_zero_blocks to a single zone */ count = min_t(size_t, len, zone_len); if (count > zone_len - (ofst & (zone_len - 1))) count = zone_len - (ofst & (zone_len - 1)); if (!zone_is_sequential(zinfo, ofst)) { ret = device_zero_blocks(fd, ofst, count, true); if (ret != 0) return ret; } len -= count; ofst += count; } return 0; } static int sb_log_location(int fd, struct blk_zone *zones, int rw, u64 *bytenr_ret) { u64 wp; int ret; /* Use the head of the zones if either zone is conventional */ if (zones[0].type == BLK_ZONE_TYPE_CONVENTIONAL) { *bytenr_ret = zones[0].start << SECTOR_SHIFT; return 0; } else if (zones[1].type == BLK_ZONE_TYPE_CONVENTIONAL) { *bytenr_ret = zones[1].start << SECTOR_SHIFT; return 0; } ret = sb_write_pointer(fd, 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(reset->cond == BLK_ZONE_COND_FULL); ret = btrfs_reset_dev_zone(fd, reset); if (ret) return ret; } } else if (ret != -ENOENT) { /* For READ, we want the previous one */ if (wp == zones[0].start << SECTOR_SHIFT) wp = (zones[1].start + zones[1].len) << SECTOR_SHIFT; wp -= BTRFS_SUPER_INFO_SIZE; } *bytenr_ret = wp; return 0; } size_t btrfs_sb_io(int fd, void *buf, off_t offset, int rw) { size_t count = BTRFS_SUPER_INFO_SIZE; struct stat stat_buf; struct blk_zone_report *rep; struct blk_zone *zones; const u64 sb_size_sector = (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT); u64 mapped = U64_MAX; u32 zone_num; u32 zone_size_sector; size_t rep_size; int mirror = -1; int i; int ret; size_t ret_sz; ASSERT(rw == READ || rw == WRITE); if (fstat(fd, &stat_buf) == -1) { error("fstat failed (%s)", strerror(errno)); exit(1); } /* Do not call ioctl(BLKGETZONESZ) on a regular file. */ if ((stat_buf.st_mode & S_IFMT) == S_IFBLK) { ret = ioctl(fd, BLKGETZONESZ, &zone_size_sector); if (ret < 0) { if (errno == ENOTTY || errno == EINVAL) { /* * No kernel support, assuming non-zoned device. * * Note: older kernels before 5.11 could return * EINVAL in case the ioctl is not available, * which is wrong. */ zone_size_sector = 0; } else { error("zoned: ioctl BLKGETZONESZ failed: %m"); exit(1); } } } else { zone_size_sector = 0; } /* We can call pread/pwrite if 'fd' is non-zoned device/file */ if (zone_size_sector == 0) { if (rw == READ) return pread64(fd, buf, count, offset); return pwrite64(fd, buf, count, offset); } ASSERT(IS_ALIGNED(zone_size_sector, sb_size_sector)); for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { if (offset == btrfs_sb_offset(i)) { mirror = i; break; } } ASSERT(mirror != -1); zone_num = sb_zone_number(ilog2(zone_size_sector) + SECTOR_SHIFT, mirror); rep_size = sizeof(struct blk_zone_report) + sizeof(struct blk_zone) * 2; rep = calloc(1, rep_size); if (!rep) { error("zoned: no memory for zones report"); exit(1); } rep->sector = zone_num * (sector_t)zone_size_sector; rep->nr_zones = 2; ret = ioctl(fd, BLKREPORTZONE, rep); if (ret) { if (errno == ENOTTY || errno == EINVAL) { /* * Note: older kernels before 5.11 could return EINVAL * in case the ioctl is not available, which is wrong. */ error("zoned: BLKREPORTZONE failed but BLKGETZONESZ works: %m"); exit(1); } error("zoned: ioctl BLKREPORTZONE failed: %m"); exit(1); } if (rep->nr_zones != 2) { if (errno == ENOENT || errno == 0) return (rw == WRITE ? count : 0); error("zoned: failed to read zone info of %u and %u: %m", zone_num, zone_num + 1); free(rep); return 0; } zones = (struct blk_zone *)(rep + 1); ret = sb_log_location(fd, zones, rw, &mapped); free(rep); /* * Special case: no superblock found in the zones. This case happens * when initializing a file-system. */ if (rw == READ && ret == -ENOENT) { memset(buf, 0, count); return count; } if (ret) return ret; if (rw == READ) ret_sz = btrfs_pread(fd, buf, count, mapped, true); else ret_sz = btrfs_pwrite(fd, buf, count, mapped, true); if (ret_sz != count) return ret_sz; /* Call fsync() to force the write order */ if (rw == WRITE && fsync(fd)) { error("failed to synchronize superblock: %s", strerror(errno)); exit(1); } return ret_sz; } /* * Check if spcecifeid region is suitable for allocation * * @device: the device to allocate a region * @pos: the position of the region * @num_bytes: the size of the region * * In non-ZONED device, anywhere is suitable for allocation. In ZONED * device, check if: * 1) the region is not on non-empty sequential zones, * 2) all zones in the region have the same zone type, * 3) it does not contain super block location */ bool btrfs_check_allocatable_zones(struct btrfs_device *device, u64 pos, u64 num_bytes) { struct btrfs_zoned_device_info *zinfo = device->zone_info; u64 nzones, begin, end; u64 sb_pos; bool is_sequential; int shift; int i; if (!zinfo || zinfo->model == ZONED_NONE) return true; nzones = num_bytes / zinfo->zone_size; begin = pos / zinfo->zone_size; end = begin + nzones; ASSERT(IS_ALIGNED(pos, zinfo->zone_size)); ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size)); if (end > zinfo->nr_zones) return false; shift = ilog2(zinfo->zone_size); for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { sb_pos = sb_zone_number(shift, i); if (!(end < sb_pos || sb_pos + 1 < begin)) return false; } is_sequential = btrfs_dev_is_sequential(device, pos); while (num_bytes) { if (is_sequential && !btrfs_dev_is_empty_zone(device, pos)) return false; if (is_sequential != btrfs_dev_is_sequential(device, pos)) return false; pos += zinfo->zone_size; num_bytes -= zinfo->zone_size; } return true; } /** * btrfs_find_allocatable_zones - 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; int shift = ilog2(zinfo->zone_size); u64 nzones = num_bytes >> shift; u64 pos = hole_start; u64 begin, end; bool is_sequential; 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; /* * The zones must be all sequential (and empty), or * conventional */ is_sequential = btrfs_dev_is_sequential(device, pos); for (i = 0; i < end - begin; i++) { u64 zone_offset = pos + ((u64)i << shift); if ((is_sequential && !btrfs_dev_is_empty_zone(device, zone_offset)) || (is_sequential != btrfs_dev_is_sequential(device, zone_offset))) { 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 = ((u64)sb_zone + BTRFS_NR_SB_LOG_ZONES) << shift; 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; } /* * Calculate an allocation pointer from the extent allocation information * for a block group consisting 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_fs_info *fs_info, struct btrfs_block_group *cache, u64 *offset_ret) { struct btrfs_root *root = btrfs_extent_root(fs_info, cache->start); struct btrfs_path *path; struct btrfs_key key; struct btrfs_key found_key; int ret; u64 length; path = btrfs_alloc_path(); if (!path) return -ENOMEM; key.objectid = cache->start + cache->length; key.type = 0; key.offset = 0; ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); /* There should be no exact match (ie. an extent) at this address */ 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; } bool zoned_profile_supported(u64 map_type) { bool data = (map_type & BTRFS_BLOCK_GROUP_DATA); u64 flags = (map_type & BTRFS_BLOCK_GROUP_PROFILE_MASK); /* SINGLE */ if (flags == 0) return true; /* We can support DUP on metadata */ if (!data && (flags & BTRFS_BLOCK_GROUP_DUP)) return true; /* All other profiles are not supported yet */ return false; } int btrfs_load_block_group_zone_info(struct btrfs_fs_info *fs_info, struct btrfs_block_group *cache) { struct btrfs_device *device; struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; struct cache_extent *ce; struct map_lookup *map; u64 logical = cache->start; u64 length = cache->length; u64 physical = 0; int ret = 0; int i; u64 *alloc_offsets = NULL; u64 last_alloc = 0; u32 num_sequential = 0, num_conventional = 0; if (!btrfs_is_zoned(fs_info)) return 0; /* Sanity check */ if (logical == BTRFS_BLOCK_RESERVED_1M_FOR_SUPER) { if (length + SZ_1M != fs_info->zone_size) { error("zoned: unaligned initial system block group"); return -EIO; } } else if (!IS_ALIGNED(length, fs_info->zone_size)) { error("zoned: unaligned block group at %llu + %llu", logical, length); return -EIO; } /* Get the chunk mapping */ ce = search_cache_extent(&map_tree->cache_tree, logical); if (!ce) { error("zoned: failed to find block group at %llu", logical); return -ENOENT; } map = container_of(ce, struct map_lookup, ce); alloc_offsets = calloc(map->num_stripes, sizeof(*alloc_offsets)); if (!alloc_offsets) { error("zoned: failed to allocate alloc_offsets"); return -ENOMEM; } for (i = 0; i < map->num_stripes; i++) { bool is_sequential; struct blk_zone zone; device = map->stripes[i].dev; physical = map->stripes[i].physical; if (device->fd == -1) { alloc_offsets[i] = WP_MISSING_DEV; continue; } is_sequential = btrfs_dev_is_sequential(device, physical); if (is_sequential) num_sequential++; else num_conventional++; if (!is_sequential) { alloc_offsets[i] = WP_CONVENTIONAL; continue; } /* * 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, fs_info->zone_size)); zone = device->zone_info->zones[physical / fs_info->zone_size]; switch (zone.cond) { case BLK_ZONE_COND_OFFLINE: case BLK_ZONE_COND_READONLY: error( "zoned: offline/readonly zone %llu on device %s (devid %llu)", physical / fs_info->zone_size, 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] = fs_info->zone_size; break; default: /* Partially used zone */ alloc_offsets[i] = ((zone.wp - zone.start) << SECTOR_SHIFT); break; } } if (num_conventional > 0) { ret = calculate_alloc_pointer(fs_info, cache, &last_alloc); if (ret || map->num_stripes == num_conventional) { if (!ret) cache->alloc_offset = last_alloc; else error( "zoned: failed to determine allocation offset of block group %llu", cache->start); goto out; } } if (!zoned_profile_supported(map->type)) { error("zoned: profile %s not yet supported", btrfs_group_profile_str(map->type)); ret = -EINVAL; goto out; } cache->alloc_offset = alloc_offsets[0]; out: /* An extent is allocated after the write pointer */ if (!ret && num_conventional && last_alloc > cache->alloc_offset) { error( "zoned: got wrong write pointer in block group %llu: %llu > %llu", logical, last_alloc, cache->alloc_offset); ret = -EIO; } if (!ret) cache->write_offset = cache->alloc_offset; free(alloc_offsets); return ret; } bool btrfs_redirty_extent_buffer_for_zoned(struct btrfs_fs_info *fs_info, u64 start, u64 end) { u64 next; struct btrfs_block_group *cache; struct extent_buffer *eb; if (!btrfs_is_zoned(fs_info)) return false; cache = btrfs_lookup_first_block_group(fs_info, start); BUG_ON(!cache); if (cache->start + cache->write_offset < start) { next = cache->start + cache->write_offset; BUG_ON(next + fs_info->nodesize > start); eb = btrfs_find_create_tree_block(fs_info, next); btrfs_mark_buffer_dirty(eb); free_extent_buffer(eb); return true; } cache->write_offset += (end + 1 - start); return false; } int btrfs_reset_chunk_zones(struct btrfs_fs_info *fs_info, u64 devid, u64 offset, u64 length) { struct btrfs_device *device; list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { struct btrfs_zoned_device_info *zinfo; struct blk_zone *reset; if (device->devid != devid) continue; zinfo = device->zone_info; if (!zone_is_sequential(zinfo, offset)) continue; reset = &zinfo->zones[offset / zinfo->zone_size]; if (btrfs_reset_dev_zone(device->fd, reset)) { error("zoned: failed to reset zone %llu: %m", offset / zinfo->zone_size); return -EIO; } } return 0; } int btrfs_wipe_temporary_sb(struct btrfs_fs_devices *fs_devices) { struct list_head *head = &fs_devices->devices; struct btrfs_device *dev; int ret = 0; list_for_each_entry(dev, head, dev_list) { struct btrfs_zoned_device_info *zinfo = dev->zone_info; if (!zinfo) continue; ret = btrfs_reset_dev_zone(dev->fd, &zinfo->zones[0]); if (ret) break; } return ret; } #endif 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; list_for_each_entry(device, &fs_devices->devices, dev_list) { /* We can skip reading of zone info for missing devices */ if (device->fd == -1) continue; ret = btrfs_get_dev_zone_info(device); if (ret) break; } return ret; } static int btrfs_get_dev_zone_info(struct btrfs_device *device) { struct btrfs_fs_info *fs_info = device->fs_info; /* * 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; return btrfs_get_zone_info(device->fd, device->name, &device->zone_info); } int btrfs_get_zone_info(int fd, const char *file, struct btrfs_zoned_device_info **zinfo_ret) { #ifdef BTRFS_ZONED struct btrfs_zoned_device_info *zinfo; int ret; #endif enum btrfs_zoned_model model; *zinfo_ret = NULL; /* Check zone model */ model = zoned_model(file); #ifdef BTRFS_ZONED zinfo = calloc(1, sizeof(*zinfo)); if (!zinfo) { error("zoned: no memory for zone information"); exit(1); } zinfo->model = model; /* Get zone information */ ret = report_zones(fd, file, zinfo); if (ret != 0) { kfree(zinfo); return ret; } *zinfo_ret = zinfo; #else error("zoned: %s: unsupported host-%s zoned block device", file, model == ZONED_HOST_MANAGED ? "managed" : "aware"); if (model == ZONED_HOST_MANAGED) return -EOPNOTSUPP; error("zoned: %s: handling host-aware block device as a regular disk", file); #endif return 0; } int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info) { struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; struct btrfs_device *device; u64 zoned_devices = 0; u64 nr_devices = 0; u64 zone_size = 0; const bool incompat_zoned = btrfs_fs_incompat(fs_info, ZONED); int ret = 0; /* Count zoned devices */ list_for_each_entry(device, &fs_devices->devices, dev_list) { enum btrfs_zoned_model model; if (device->fd == -1) continue; model = zoned_model(device->name); /* * A Host-Managed zoned device must be used as a zoned device. * A Host-Aware zoned device and a non-zoned devices can be * treated as a zoned device, if ZONED flag is enabled in the * superblock. */ if (model == ZONED_HOST_MANAGED || (model == ZONED_HOST_AWARE && incompat_zoned) || (model == ZONED_NONE && incompat_zoned)) { struct btrfs_zoned_device_info *zone_info = device->zone_info; zoned_devices++; if (!zone_size) { zone_size = zone_info->zone_size; } else if (zone_info->zone_size != zone_size) { error( "zoned: unequal block device zone sizes: have %llu found %llu", device->zone_info->zone_size, zone_size); ret = -EINVAL; goto out; } } nr_devices++; } if (!zoned_devices && !incompat_zoned) goto out; if (!zoned_devices && incompat_zoned) { /* No zoned block device found on ZONED filesystem */ error("zoned: no zoned devices found on a zoned filesystem"); ret = -EINVAL; goto out; } if (zoned_devices && !incompat_zoned) { error("zoned: mode not enabled but zoned device found"); ret = -EINVAL; goto out; } if (zoned_devices != nr_devices) { error("zoned: cannot mix zoned and regular devices"); ret = -EINVAL; goto out; } /* * stripe_size is always aligned to BTRFS_STRIPE_LEN in * __btrfs_alloc_chunk(). Since we want stripe_len == zone_size, * check the alignment here. */ if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) { error("zoned: zone size %llu not aligned to stripe %u", zone_size, BTRFS_STRIPE_LEN); ret = -EINVAL; goto out; } if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) { error("zoned: mixed block groups not supported"); ret = -EINVAL; goto out; } fs_info->zone_size = zone_size; fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED; out: return ret; }