-/*
- * Reserve space from free_tree.
- * The algorithm is very simple, find the first cache_extent with enough space
- * and allocate from its beginning.
- */
-static int reserve_free_space(struct cache_tree *free_tree, u64 len,
- u64 *ret_start)
-{
- struct cache_extent *cache;
- int found = 0;
-
- ASSERT(ret_start != NULL);
- cache = first_cache_extent(free_tree);
- while (cache) {
- if (cache->size > len) {
- found = 1;
- *ret_start = cache->start;
-
- cache->size -= len;
- if (cache->size == 0) {
- remove_cache_extent(free_tree, cache);
- free(cache);
- } else {
- cache->start += len;
- }
- break;
- }
- cache = next_cache_extent(cache);
- }
- if (!found)
- return -ENOSPC;
- return 0;
-}
-
-static inline int write_temp_super(int fd, struct btrfs_super_block *sb,
- u64 sb_bytenr)
-{
- u32 crc = ~(u32)0;
- int ret;
-
- crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
- BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- btrfs_csum_final(crc, (char *)&sb->csum[0]);
- ret = pwrite(fd, sb, BTRFS_SUPER_INFO_SIZE, sb_bytenr);
- if (ret < BTRFS_SUPER_INFO_SIZE)
- ret = (ret < 0 ? -errno : -EIO);
- else
- ret = 0;
- return ret;
-}
-
-/*
- * Setup temporary superblock at cfg->super_bynter
- * Needed info are extracted from cfg, and root_bytenr, chunk_bytenr
- *
- * For now sys chunk array will be empty and dev_item is empty too.
- * They will be re-initialized at temp chunk tree setup.
- *
- * The superblock signature is not valid, denotes a partially created
- * filesystem, needs to be finalized.
- */
-static int setup_temp_super(int fd, struct btrfs_mkfs_config *cfg,
- u64 root_bytenr, u64 chunk_bytenr)
-{
- unsigned char chunk_uuid[BTRFS_UUID_SIZE];
- char super_buf[BTRFS_SUPER_INFO_SIZE];
- struct btrfs_super_block *super = (struct btrfs_super_block *)super_buf;
- int ret;
-
- memset(super_buf, 0, BTRFS_SUPER_INFO_SIZE);
- cfg->num_bytes = round_down(cfg->num_bytes, cfg->sectorsize);
-
- if (*cfg->fs_uuid) {
- if (uuid_parse(cfg->fs_uuid, super->fsid) != 0) {
- error("cound not parse UUID: %s", cfg->fs_uuid);
- ret = -EINVAL;
- goto out;
- }
- if (!test_uuid_unique(cfg->fs_uuid)) {
- error("non-unique UUID: %s", cfg->fs_uuid);
- ret = -EINVAL;
- goto out;
- }
- } else {
- uuid_generate(super->fsid);
- uuid_unparse(super->fsid, cfg->fs_uuid);
- }
- uuid_generate(chunk_uuid);
- uuid_unparse(chunk_uuid, cfg->chunk_uuid);
-
- btrfs_set_super_bytenr(super, cfg->super_bytenr);
- btrfs_set_super_num_devices(super, 1);
- btrfs_set_super_magic(super, BTRFS_MAGIC_PARTIAL);
- btrfs_set_super_generation(super, 1);
- btrfs_set_super_root(super, root_bytenr);
- btrfs_set_super_chunk_root(super, chunk_bytenr);
- btrfs_set_super_total_bytes(super, cfg->num_bytes);
- /*
- * Temporary filesystem will only have 6 tree roots:
- * chunk tree, root tree, extent_tree, device tree, fs tree
- * and csum tree.
- */
- btrfs_set_super_bytes_used(super, 6 * cfg->nodesize);
- btrfs_set_super_sectorsize(super, cfg->sectorsize);
- btrfs_set_super_leafsize(super, cfg->nodesize);
- btrfs_set_super_nodesize(super, cfg->nodesize);
- btrfs_set_super_stripesize(super, cfg->stripesize);
- btrfs_set_super_csum_type(super, BTRFS_CSUM_TYPE_CRC32);
- btrfs_set_super_chunk_root(super, chunk_bytenr);
- btrfs_set_super_cache_generation(super, -1);
- btrfs_set_super_incompat_flags(super, cfg->features);
- if (cfg->label)
- __strncpy_null(super->label, cfg->label, BTRFS_LABEL_SIZE - 1);
-
- /* Sys chunk array will be re-initialized at chunk tree init time */
- super->sys_chunk_array_size = 0;
-
- ret = write_temp_super(fd, super, cfg->super_bytenr);
-out:
- return ret;
-}
-
-/*
- * Setup an extent buffer for tree block.
- */
-static int setup_temp_extent_buffer(struct extent_buffer *buf,
- struct btrfs_mkfs_config *cfg,
- u64 bytenr, u64 owner)
-{
- unsigned char fsid[BTRFS_FSID_SIZE];
- unsigned char chunk_uuid[BTRFS_UUID_SIZE];
- int ret;
-
- ret = uuid_parse(cfg->fs_uuid, fsid);
- if (ret)
- return -EINVAL;
- ret = uuid_parse(cfg->chunk_uuid, chunk_uuid);
- if (ret)
- return -EINVAL;
-
- memset(buf->data, 0, cfg->nodesize);
- buf->len = cfg->nodesize;
- btrfs_set_header_bytenr(buf, bytenr);
- btrfs_set_header_generation(buf, 1);
- btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(buf, owner);
- btrfs_set_header_flags(buf, BTRFS_HEADER_FLAG_WRITTEN);
- write_extent_buffer(buf, chunk_uuid, btrfs_header_chunk_tree_uuid(buf),
- BTRFS_UUID_SIZE);
- write_extent_buffer(buf, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
- return 0;
-}
-
-static inline int write_temp_extent_buffer(int fd, struct extent_buffer *buf,
- u64 bytenr)
-{
- int ret;
-
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
-
- /* Temporary extent buffer is always mapped 1:1 on disk */
- ret = pwrite(fd, buf->data, buf->len, bytenr);
- if (ret < buf->len)
- ret = (ret < 0 ? ret : -EIO);
- else
- ret = 0;
- return ret;
-}
-
-/*
- * Insert a root item for temporary tree root
- *
- * Only used in make_btrfs_v2().
- */
-static void insert_temp_root_item(struct extent_buffer *buf,
- struct btrfs_mkfs_config *cfg,
- int *slot, u32 *itemoff, u64 objectid,
- u64 bytenr)
-{
- struct btrfs_root_item root_item;
- struct btrfs_inode_item *inode_item;
- struct btrfs_disk_key disk_key;
-
- btrfs_set_header_nritems(buf, *slot + 1);
- (*itemoff) -= sizeof(root_item);
- memset(&root_item, 0, sizeof(root_item));
- inode_item = &root_item.inode;
- btrfs_set_stack_inode_generation(inode_item, 1);
- btrfs_set_stack_inode_size(inode_item, 3);
- btrfs_set_stack_inode_nlink(inode_item, 1);
- btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
- btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
- btrfs_set_root_refs(&root_item, 1);
- btrfs_set_root_used(&root_item, cfg->nodesize);
- btrfs_set_root_generation(&root_item, 1);
- btrfs_set_root_bytenr(&root_item, bytenr);
-
- memset(&disk_key, 0, sizeof(disk_key));
- btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
- btrfs_set_disk_key_objectid(&disk_key, objectid);
- btrfs_set_disk_key_offset(&disk_key, 0);
-
- btrfs_set_item_key(buf, &disk_key, *slot);
- btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, *slot),
- sizeof(root_item));
- (*slot)++;
-}
-
-static int setup_temp_root_tree(int fd, struct btrfs_mkfs_config *cfg,
- u64 root_bytenr, u64 extent_bytenr,
- u64 dev_bytenr, u64 fs_bytenr, u64 csum_bytenr)
-{
- struct extent_buffer *buf = NULL;
- u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
- int slot = 0;
- int ret;
-
- /*
- * Provided bytenr must in ascending order, or tree root will have a
- * bad key order.
- */
- if (!(root_bytenr < extent_bytenr && extent_bytenr < dev_bytenr &&
- dev_bytenr < fs_bytenr && fs_bytenr < csum_bytenr)) {
- error("bad tree bytenr order: "
- "root < extent %llu < %llu, "
- "extent < dev %llu < %llu, "
- "dev < fs %llu < %llu, "
- "fs < csum %llu < %llu",
- (unsigned long long)root_bytenr,
- (unsigned long long)extent_bytenr,
- (unsigned long long)extent_bytenr,
- (unsigned long long)dev_bytenr,
- (unsigned long long)dev_bytenr,
- (unsigned long long)fs_bytenr,
- (unsigned long long)fs_bytenr,
- (unsigned long long)csum_bytenr);
- return -EINVAL;
- }
- buf = malloc(sizeof(*buf) + cfg->nodesize);
- if (!buf)
- return -ENOMEM;
-
- ret = setup_temp_extent_buffer(buf, cfg, root_bytenr,
- BTRFS_ROOT_TREE_OBJECTID);
- if (ret < 0)
- goto out;
-
- insert_temp_root_item(buf, cfg, &slot, &itemoff,
- BTRFS_EXTENT_TREE_OBJECTID, extent_bytenr);
- insert_temp_root_item(buf, cfg, &slot, &itemoff,
- BTRFS_DEV_TREE_OBJECTID, dev_bytenr);
- insert_temp_root_item(buf, cfg, &slot, &itemoff,
- BTRFS_FS_TREE_OBJECTID, fs_bytenr);
- insert_temp_root_item(buf, cfg, &slot, &itemoff,
- BTRFS_CSUM_TREE_OBJECTID, csum_bytenr);
-
- ret = write_temp_extent_buffer(fd, buf, root_bytenr);
-out:
- free(buf);
- return ret;
-}
-
-static int insert_temp_dev_item(int fd, struct extent_buffer *buf,
- struct btrfs_mkfs_config *cfg,
- int *slot, u32 *itemoff)
-{
- struct btrfs_disk_key disk_key;
- struct btrfs_dev_item *dev_item;
- char super_buf[BTRFS_SUPER_INFO_SIZE];
- unsigned char dev_uuid[BTRFS_UUID_SIZE];
- unsigned char fsid[BTRFS_FSID_SIZE];
- struct btrfs_super_block *super = (struct btrfs_super_block *)super_buf;
- int ret;
-
- ret = pread(fd, super_buf, BTRFS_SUPER_INFO_SIZE, cfg->super_bytenr);
- if (ret < BTRFS_SUPER_INFO_SIZE) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- btrfs_set_header_nritems(buf, *slot + 1);
- (*itemoff) -= sizeof(*dev_item);
- /* setup device item 1, 0 is for replace case */
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, 1);
- btrfs_set_item_key(buf, &disk_key, *slot);
- btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(*dev_item));
-
- dev_item = btrfs_item_ptr(buf, *slot, struct btrfs_dev_item);
- /* Generate device uuid */
- uuid_generate(dev_uuid);
- write_extent_buffer(buf, dev_uuid,
- (unsigned long)btrfs_device_uuid(dev_item),
- BTRFS_UUID_SIZE);
- uuid_parse(cfg->fs_uuid, fsid);
- write_extent_buffer(buf, fsid,
- (unsigned long)btrfs_device_fsid(dev_item),
- BTRFS_FSID_SIZE);
- btrfs_set_device_id(buf, dev_item, 1);
- btrfs_set_device_generation(buf, dev_item, 0);
- btrfs_set_device_total_bytes(buf, dev_item, cfg->num_bytes);
- /*
- * The number must match the initial SYSTEM and META chunk size
- */
- btrfs_set_device_bytes_used(buf, dev_item,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE +
- BTRFS_CONVERT_META_GROUP_SIZE);
- btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_type(buf, dev_item, 0);
-
- /* Super dev_item is not complete, copy the complete one to sb */
- read_extent_buffer(buf, &super->dev_item, (unsigned long)dev_item,
- sizeof(*dev_item));
- ret = write_temp_super(fd, super, cfg->super_bytenr);
- (*slot)++;
-out:
- return ret;
-}
-
-static int insert_temp_chunk_item(int fd, struct extent_buffer *buf,
- struct btrfs_mkfs_config *cfg,
- int *slot, u32 *itemoff, u64 start, u64 len,
- u64 type)
-{
- struct btrfs_chunk *chunk;
- struct btrfs_disk_key disk_key;
- char super_buf[BTRFS_SUPER_INFO_SIZE];
- struct btrfs_super_block *sb = (struct btrfs_super_block *)super_buf;
- int ret = 0;
-
- ret = pread(fd, super_buf, BTRFS_SUPER_INFO_SIZE,
- cfg->super_bytenr);
- if (ret < BTRFS_SUPER_INFO_SIZE) {
- ret = (ret < 0 ? ret : -EIO);
- return ret;
- }
-
- btrfs_set_header_nritems(buf, *slot + 1);
- (*itemoff) -= btrfs_chunk_item_size(1);
- btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, start);
- btrfs_set_item_key(buf, &disk_key, *slot);
- btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(*slot),
- btrfs_chunk_item_size(1));
-
- chunk = btrfs_item_ptr(buf, *slot, struct btrfs_chunk);
- btrfs_set_chunk_length(buf, chunk, len);
- btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
- btrfs_set_chunk_type(buf, chunk, type);
- btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
- btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
- btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
- btrfs_set_chunk_num_stripes(buf, chunk, 1);
- /* TODO: Support DUP profile for system chunk */
- btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
- /* We are doing 1:1 mapping, so start is its dev offset */
- btrfs_set_stripe_offset_nr(buf, chunk, 0, start);
- write_extent_buffer(buf, &sb->dev_item.uuid,
- (unsigned long)btrfs_stripe_dev_uuid_nr(chunk, 0),
- BTRFS_UUID_SIZE);
- (*slot)++;
-
- /*
- * If it's system chunk, also copy it to super block.
- */
- if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
- char *cur;
-
- cur = (char *)sb->sys_chunk_array + sb->sys_chunk_array_size;
- memcpy(cur, &disk_key, sizeof(disk_key));
- cur += sizeof(disk_key);
- read_extent_buffer(buf, cur, (unsigned long int)chunk,
- btrfs_chunk_item_size(1));
- sb->sys_chunk_array_size += btrfs_chunk_item_size(1) +
- sizeof(disk_key);
-
- ret = write_temp_super(fd, sb, cfg->super_bytenr);
- }
- return ret;
-}
-
-static int setup_temp_chunk_tree(int fd, struct btrfs_mkfs_config *cfg,
- u64 sys_chunk_start, u64 meta_chunk_start,
- u64 chunk_bytenr)
-{
- struct extent_buffer *buf = NULL;
- u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
- int slot = 0;
- int ret;
-
- /* Must ensure SYS chunk starts before META chunk */
- if (meta_chunk_start < sys_chunk_start) {
- error("wrong chunk order: meta < system %llu < %llu",
- (unsigned long long)meta_chunk_start,
- (unsigned long long)sys_chunk_start);
- return -EINVAL;
- }
- buf = malloc(sizeof(*buf) + cfg->nodesize);
- if (!buf)
- return -ENOMEM;
- ret = setup_temp_extent_buffer(buf, cfg, chunk_bytenr,
- BTRFS_CHUNK_TREE_OBJECTID);
- if (ret < 0)
- goto out;
-
- ret = insert_temp_dev_item(fd, buf, cfg, &slot, &itemoff);
- if (ret < 0)
- goto out;
- ret = insert_temp_chunk_item(fd, buf, cfg, &slot, &itemoff,
- sys_chunk_start,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE,
- BTRFS_BLOCK_GROUP_SYSTEM);
- if (ret < 0)
- goto out;
- ret = insert_temp_chunk_item(fd, buf, cfg, &slot, &itemoff,
- meta_chunk_start,
- BTRFS_CONVERT_META_GROUP_SIZE,
- BTRFS_BLOCK_GROUP_METADATA);
- if (ret < 0)
- goto out;
- ret = write_temp_extent_buffer(fd, buf, chunk_bytenr);
-
-out:
- free(buf);
- return ret;
-}
-
-static void insert_temp_dev_extent(struct extent_buffer *buf,
- int *slot, u32 *itemoff, u64 start, u64 len)
-{
- struct btrfs_dev_extent *dev_extent;
- struct btrfs_disk_key disk_key;
-
- btrfs_set_header_nritems(buf, *slot + 1);
- (*itemoff) -= sizeof(*dev_extent);
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
- btrfs_set_disk_key_objectid(&disk_key, 1);
- btrfs_set_disk_key_offset(&disk_key, start);
- btrfs_set_item_key(buf, &disk_key, *slot);
- btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(*dev_extent));
-
- dev_extent = btrfs_item_ptr(buf, *slot, struct btrfs_dev_extent);
- btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_dev_extent_length(buf, dev_extent, len);
- btrfs_set_dev_extent_chunk_offset(buf, dev_extent, start);
- btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
- BTRFS_CHUNK_TREE_OBJECTID);
- (*slot)++;
-}
-
-static int setup_temp_dev_tree(int fd, struct btrfs_mkfs_config *cfg,
- u64 sys_chunk_start, u64 meta_chunk_start,
- u64 dev_bytenr)
-{
- struct extent_buffer *buf = NULL;
- u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
- int slot = 0;
- int ret;
-
- /* Must ensure SYS chunk starts before META chunk */
- if (meta_chunk_start < sys_chunk_start) {
- error("wrong chunk order: meta < system %llu < %llu",
- (unsigned long long)meta_chunk_start,
- (unsigned long long)sys_chunk_start);
- return -EINVAL;
- }
- buf = malloc(sizeof(*buf) + cfg->nodesize);
- if (!buf)
- return -ENOMEM;
- ret = setup_temp_extent_buffer(buf, cfg, dev_bytenr,
- BTRFS_DEV_TREE_OBJECTID);
- if (ret < 0)
- goto out;
- insert_temp_dev_extent(buf, &slot, &itemoff, sys_chunk_start,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- insert_temp_dev_extent(buf, &slot, &itemoff, meta_chunk_start,
- BTRFS_CONVERT_META_GROUP_SIZE);
- ret = write_temp_extent_buffer(fd, buf, dev_bytenr);
-out:
- free(buf);
- return ret;
-}
-
-static int setup_temp_fs_tree(int fd, struct btrfs_mkfs_config *cfg,
- u64 fs_bytenr)
-{
- struct extent_buffer *buf = NULL;
- int ret;
-
- buf = malloc(sizeof(*buf) + cfg->nodesize);
- if (!buf)
- return -ENOMEM;
- ret = setup_temp_extent_buffer(buf, cfg, fs_bytenr,
- BTRFS_FS_TREE_OBJECTID);
- if (ret < 0)
- goto out;
- /*
- * Temporary fs tree is completely empty.
- */
- ret = write_temp_extent_buffer(fd, buf, fs_bytenr);
-out:
- free(buf);
- return ret;
-}
-
-static int setup_temp_csum_tree(int fd, struct btrfs_mkfs_config *cfg,
- u64 csum_bytenr)
-{
- struct extent_buffer *buf = NULL;
- int ret;
-
- buf = malloc(sizeof(*buf) + cfg->nodesize);
- if (!buf)
- return -ENOMEM;
- ret = setup_temp_extent_buffer(buf, cfg, csum_bytenr,
- BTRFS_CSUM_TREE_OBJECTID);
- if (ret < 0)
- goto out;
- /*
- * Temporary csum tree is completely empty.
- */
- ret = write_temp_extent_buffer(fd, buf, csum_bytenr);
-out:
- free(buf);
- return ret;
-}
-
-/*
- * Insert one temporary extent item.
- *
- * NOTE: if skinny_metadata is not enabled, this function must be called
- * after all other trees are initialized.
- * Or fs without skinny-metadata will be screwed up.
- */
-static int insert_temp_extent_item(int fd, struct extent_buffer *buf,
- struct btrfs_mkfs_config *cfg,
- int *slot, u32 *itemoff, u64 bytenr,
- u64 ref_root)
-{
- struct extent_buffer *tmp;
- struct btrfs_extent_item *ei;
- struct btrfs_extent_inline_ref *iref;
- struct btrfs_disk_key disk_key;
- struct btrfs_disk_key tree_info_key;
- struct btrfs_tree_block_info *info;
- int itemsize;
- int skinny_metadata = cfg->features &
- BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA;
- int ret;
-
- if (skinny_metadata)
- itemsize = sizeof(*ei) + sizeof(*iref);
- else
- itemsize = sizeof(*ei) + sizeof(*iref) +
- sizeof(struct btrfs_tree_block_info);
-
- btrfs_set_header_nritems(buf, *slot + 1);
- *(itemoff) -= itemsize;
-
- if (skinny_metadata) {
- btrfs_set_disk_key_type(&disk_key, BTRFS_METADATA_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- } else {
- btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
- }
- btrfs_set_disk_key_objectid(&disk_key, bytenr);
-
- btrfs_set_item_key(buf, &disk_key, *slot);
- btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(*slot), itemsize);
-
- ei = btrfs_item_ptr(buf, *slot, struct btrfs_extent_item);
- btrfs_set_extent_refs(buf, ei, 1);
- btrfs_set_extent_generation(buf, ei, 1);
- btrfs_set_extent_flags(buf, ei, BTRFS_EXTENT_FLAG_TREE_BLOCK);
-
- if (skinny_metadata) {
- iref = (struct btrfs_extent_inline_ref *)(ei + 1);
- } else {
- info = (struct btrfs_tree_block_info *)(ei + 1);
- iref = (struct btrfs_extent_inline_ref *)(info + 1);
- }
- btrfs_set_extent_inline_ref_type(buf, iref,
- BTRFS_TREE_BLOCK_REF_KEY);
- btrfs_set_extent_inline_ref_offset(buf, iref, ref_root);
-
- (*slot)++;
- if (skinny_metadata)
- return 0;
-
- /*
- * Lastly, check the tree block key by read the tree block
- * Since we do 1:1 mapping for convert case, we can directly
- * read the bytenr from disk
- */
- tmp = malloc(sizeof(*tmp) + cfg->nodesize);
- if (!tmp)
- return -ENOMEM;
- ret = setup_temp_extent_buffer(tmp, cfg, bytenr, ref_root);
- if (ret < 0)
- goto out;
- ret = pread(fd, tmp->data, cfg->nodesize, bytenr);
- if (ret < cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
- if (btrfs_header_nritems(tmp) == 0) {
- btrfs_set_disk_key_type(&tree_info_key, 0);
- btrfs_set_disk_key_objectid(&tree_info_key, 0);
- btrfs_set_disk_key_offset(&tree_info_key, 0);
- } else {
- btrfs_item_key(tmp, &tree_info_key, 0);
- }
- btrfs_set_tree_block_key(buf, info, &tree_info_key);
-
-out:
- free(tmp);
- return ret;
-}
-
-static void insert_temp_block_group(struct extent_buffer *buf,
- struct btrfs_mkfs_config *cfg,
- int *slot, u32 *itemoff,
- u64 bytenr, u64 len, u64 used, u64 flag)
-{
- struct btrfs_block_group_item bgi;
- struct btrfs_disk_key disk_key;
-
- btrfs_set_header_nritems(buf, *slot + 1);
- (*itemoff) -= sizeof(bgi);
- btrfs_set_disk_key_type(&disk_key, BTRFS_BLOCK_GROUP_ITEM_KEY);
- btrfs_set_disk_key_objectid(&disk_key, bytenr);
- btrfs_set_disk_key_offset(&disk_key, len);
- btrfs_set_item_key(buf, &disk_key, *slot);
- btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(bgi));
-
- btrfs_set_block_group_flags(&bgi, flag);
- btrfs_set_block_group_used(&bgi, used);
- btrfs_set_block_group_chunk_objectid(&bgi,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- write_extent_buffer(buf, &bgi, btrfs_item_ptr_offset(buf, *slot),
- sizeof(bgi));
- (*slot)++;
-}
-
-static int setup_temp_extent_tree(int fd, struct btrfs_mkfs_config *cfg,
- u64 chunk_bytenr, u64 root_bytenr,
- u64 extent_bytenr, u64 dev_bytenr,
- u64 fs_bytenr, u64 csum_bytenr)
-{
- struct extent_buffer *buf = NULL;
- u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
- int slot = 0;
- int ret;
-
- /*
- * We must ensure provided bytenr are in ascending order,
- * or extent tree key order will be broken.
- */
- if (!(chunk_bytenr < root_bytenr && root_bytenr < extent_bytenr &&
- extent_bytenr < dev_bytenr && dev_bytenr < fs_bytenr &&
- fs_bytenr < csum_bytenr)) {
- error("bad tree bytenr order: "
- "chunk < root %llu < %llu, "
- "root < extent %llu < %llu, "
- "extent < dev %llu < %llu, "
- "dev < fs %llu < %llu, "
- "fs < csum %llu < %llu",
- (unsigned long long)chunk_bytenr,
- (unsigned long long)root_bytenr,
- (unsigned long long)root_bytenr,
- (unsigned long long)extent_bytenr,
- (unsigned long long)extent_bytenr,
- (unsigned long long)dev_bytenr,
- (unsigned long long)dev_bytenr,
- (unsigned long long)fs_bytenr,
- (unsigned long long)fs_bytenr,
- (unsigned long long)csum_bytenr);
- return -EINVAL;
- }
- buf = malloc(sizeof(*buf) + cfg->nodesize);
- if (!buf)
- return -ENOMEM;
-
- ret = setup_temp_extent_buffer(buf, cfg, extent_bytenr,
- BTRFS_EXTENT_TREE_OBJECTID);
- if (ret < 0)
- goto out;
-
- ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
- chunk_bytenr, BTRFS_CHUNK_TREE_OBJECTID);
- if (ret < 0)
- goto out;
-
- insert_temp_block_group(buf, cfg, &slot, &itemoff, chunk_bytenr,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE, cfg->nodesize,
- BTRFS_BLOCK_GROUP_SYSTEM);
-
- ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
- root_bytenr, BTRFS_ROOT_TREE_OBJECTID);
- if (ret < 0)
- goto out;
-
- /* 5 tree block used, root, extent, dev, fs and csum*/
- insert_temp_block_group(buf, cfg, &slot, &itemoff, root_bytenr,
- BTRFS_CONVERT_META_GROUP_SIZE, cfg->nodesize * 5,
- BTRFS_BLOCK_GROUP_METADATA);
-
- ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
- extent_bytenr, BTRFS_EXTENT_TREE_OBJECTID);
- if (ret < 0)
- goto out;
- ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
- dev_bytenr, BTRFS_DEV_TREE_OBJECTID);
- if (ret < 0)
- goto out;
- ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
- fs_bytenr, BTRFS_FS_TREE_OBJECTID);
- if (ret < 0)
- goto out;
- ret = insert_temp_extent_item(fd, buf, cfg, &slot, &itemoff,
- csum_bytenr, BTRFS_CSUM_TREE_OBJECTID);
- if (ret < 0)
- goto out;
-
- ret = write_temp_extent_buffer(fd, buf, extent_bytenr);
-out:
- free(buf);
- return ret;
-}
-
-/*
- * Improved version of make_btrfs().
- *
- * This one will
- * 1) Do chunk allocation to avoid used data
- * And after this function, extent type matches chunk type
- * 2) Better structured code
- * No super long hand written codes to initialized all tree blocks
- * Split into small blocks and reuse codes.
- * TODO: Reuse tree operation facilities by introducing new flags
- */
-static int make_convert_btrfs(int fd, struct btrfs_mkfs_config *cfg,
- struct btrfs_convert_context *cctx)
-{
- struct cache_tree *free = &cctx->free;
- struct cache_tree *used = &cctx->used;
- u64 sys_chunk_start;
- u64 meta_chunk_start;
- /* chunk tree bytenr, in system chunk */
- u64 chunk_bytenr;
- /* metadata trees bytenr, in metadata chunk */
- u64 root_bytenr;
- u64 extent_bytenr;
- u64 dev_bytenr;
- u64 fs_bytenr;
- u64 csum_bytenr;
- int ret;
-
- /* Shouldn't happen */
- BUG_ON(cache_tree_empty(used));
-
- /*
- * reserve space for temporary superblock first
- * Here we allocate a little larger space, to keep later
- * free space will be STRIPE_LEN aligned
- */
- ret = reserve_free_space(free, BTRFS_STRIPE_LEN,
- &cfg->super_bytenr);
- if (ret < 0)
- goto out;
-
- /*
- * Then reserve system chunk space
- * TODO: Change system group size depending on cctx->total_bytes.
- * If using current 4M, it can only handle less than one TB for
- * worst case and then run out of sys space.
- */
- ret = reserve_free_space(free, BTRFS_MKFS_SYSTEM_GROUP_SIZE,
- &sys_chunk_start);
- if (ret < 0)
- goto out;
- ret = reserve_free_space(free, BTRFS_CONVERT_META_GROUP_SIZE,
- &meta_chunk_start);
- if (ret < 0)
- goto out;
-
- /*
- * Allocated meta/sys chunks will be mapped 1:1 with device offset.
- *
- * Inside the allocated metadata chunk, the layout will be:
- * | offset | contents |
- * -------------------------------------
- * | +0 | tree root |
- * | +nodesize | extent root |
- * | +nodesize * 2 | device root |
- * | +nodesize * 3 | fs tree |
- * | +nodesize * 4 | csum tree |
- * -------------------------------------
- * Inside the allocated system chunk, the layout will be:
- * | offset | contents |
- * -------------------------------------
- * | +0 | chunk root |
- * -------------------------------------
- */
- chunk_bytenr = sys_chunk_start;
- root_bytenr = meta_chunk_start;
- extent_bytenr = meta_chunk_start + cfg->nodesize;
- dev_bytenr = meta_chunk_start + cfg->nodesize * 2;
- fs_bytenr = meta_chunk_start + cfg->nodesize * 3;
- csum_bytenr = meta_chunk_start + cfg->nodesize * 4;
-
- ret = setup_temp_super(fd, cfg, root_bytenr, chunk_bytenr);
- if (ret < 0)
- goto out;
-
- ret = setup_temp_root_tree(fd, cfg, root_bytenr, extent_bytenr,
- dev_bytenr, fs_bytenr, csum_bytenr);
- if (ret < 0)
- goto out;
- ret = setup_temp_chunk_tree(fd, cfg, sys_chunk_start, meta_chunk_start,
- chunk_bytenr);
- if (ret < 0)
- goto out;
- ret = setup_temp_dev_tree(fd, cfg, sys_chunk_start, meta_chunk_start,
- dev_bytenr);
- if (ret < 0)
- goto out;
- ret = setup_temp_fs_tree(fd, cfg, fs_bytenr);
- if (ret < 0)
- goto out;
- ret = setup_temp_csum_tree(fd, cfg, csum_bytenr);
- if (ret < 0)
- goto out;
- /*
- * Setup extent tree last, since it may need to read tree block key
- * for non-skinny metadata case.
- */
- ret = setup_temp_extent_tree(fd, cfg, chunk_bytenr, root_bytenr,
- extent_bytenr, dev_bytenr, fs_bytenr,
- csum_bytenr);
-out:
- return ret;
-}
-
-/*
- * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
- *
- * The superblock signature is not valid, denotes a partially created
- * filesystem, needs to be finalized.
- */
-int make_btrfs(int fd, struct btrfs_mkfs_config *cfg,
- struct btrfs_convert_context *cctx)
-{
- struct btrfs_super_block super;
- struct extent_buffer *buf;
- struct btrfs_root_item root_item;
- struct btrfs_disk_key disk_key;
- struct btrfs_extent_item *extent_item;
- struct btrfs_inode_item *inode_item;
- struct btrfs_chunk *chunk;
- struct btrfs_dev_item *dev_item;
- struct btrfs_dev_extent *dev_extent;
- u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
- u8 *ptr;
- int i;
- int ret;
- u32 itemoff;
- u32 nritems = 0;
- u64 first_free;
- u64 ref_root;
- u32 array_size;
- u32 item_size;
- int skinny_metadata = !!(cfg->features &
- BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
- u64 num_bytes;
-
- if (cctx)
- return make_convert_btrfs(fd, cfg, cctx);
- buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
- if (!buf)
- return -ENOMEM;
-
- first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
- first_free &= ~((u64)cfg->sectorsize - 1);
-
- memset(&super, 0, sizeof(super));
-
- num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
- if (*cfg->fs_uuid) {
- if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
- error("cannot not parse UUID: %s", cfg->fs_uuid);
- ret = -EINVAL;
- goto out;
- }
- if (!test_uuid_unique(cfg->fs_uuid)) {
- error("non-unique UUID: %s", cfg->fs_uuid);
- ret = -EBUSY;
- goto out;
- }
- } else {
- uuid_generate(super.fsid);
- if (cfg->fs_uuid)
- uuid_unparse(super.fsid, cfg->fs_uuid);
- }
- uuid_generate(super.dev_item.uuid);
- uuid_generate(chunk_tree_uuid);
-
- btrfs_set_super_bytenr(&super, cfg->blocks[0]);
- btrfs_set_super_num_devices(&super, 1);
- btrfs_set_super_magic(&super, BTRFS_MAGIC_PARTIAL);
- btrfs_set_super_generation(&super, 1);
- btrfs_set_super_root(&super, cfg->blocks[1]);
- btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
- btrfs_set_super_total_bytes(&super, num_bytes);
- btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
- btrfs_set_super_sectorsize(&super, cfg->sectorsize);
- btrfs_set_super_leafsize(&super, cfg->nodesize);
- btrfs_set_super_nodesize(&super, cfg->nodesize);
- btrfs_set_super_stripesize(&super, cfg->stripesize);
- btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
- btrfs_set_super_chunk_root_generation(&super, 1);
- btrfs_set_super_cache_generation(&super, -1);
- btrfs_set_super_incompat_flags(&super, cfg->features);
- if (cfg->label)
- __strncpy_null(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
-
- /* create the tree of root objects */
- memset(buf->data, 0, cfg->nodesize);
- buf->len = cfg->nodesize;
- btrfs_set_header_bytenr(buf, cfg->blocks[1]);
- btrfs_set_header_nritems(buf, 4);
- btrfs_set_header_generation(buf, 1);
- btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
- write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
- BTRFS_FSID_SIZE);
-
- write_extent_buffer(buf, chunk_tree_uuid,
- btrfs_header_chunk_tree_uuid(buf),
- BTRFS_UUID_SIZE);
-
- /* create the items for the root tree */
- memset(&root_item, 0, sizeof(root_item));
- inode_item = &root_item.inode;
- btrfs_set_stack_inode_generation(inode_item, 1);
- btrfs_set_stack_inode_size(inode_item, 3);
- btrfs_set_stack_inode_nlink(inode_item, 1);
- btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
- btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
- btrfs_set_root_refs(&root_item, 1);
- btrfs_set_root_used(&root_item, cfg->nodesize);
- btrfs_set_root_generation(&root_item, 1);
-
- memset(&disk_key, 0, sizeof(disk_key));
- btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- nritems = 0;
-
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
- nritems), sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
-
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the items for the extent tree */
- memset(buf->data + sizeof(struct btrfs_header), 0,
- cfg->nodesize - sizeof(struct btrfs_header));
- nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
- for (i = 1; i < 7; i++) {
- item_size = sizeof(struct btrfs_extent_item);
- if (!skinny_metadata)
- item_size += sizeof(struct btrfs_tree_block_info);
-
- BUG_ON(cfg->blocks[i] < first_free);
- BUG_ON(cfg->blocks[i] < cfg->blocks[i - 1]);
-
- /* create extent item */
- itemoff -= item_size;
- btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
- if (skinny_metadata) {
- btrfs_set_disk_key_type(&disk_key,
- BTRFS_METADATA_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- } else {
- btrfs_set_disk_key_type(&disk_key,
- BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
- }
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
- itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- item_size);
- extent_item = btrfs_item_ptr(buf, nritems,
- struct btrfs_extent_item);
- btrfs_set_extent_refs(buf, extent_item, 1);
- btrfs_set_extent_generation(buf, extent_item, 1);
- btrfs_set_extent_flags(buf, extent_item,
- BTRFS_EXTENT_FLAG_TREE_BLOCK);
- nritems++;
-
- /* create extent ref */
- ref_root = reference_root_table[i];
- btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
- btrfs_set_disk_key_offset(&disk_key, ref_root);
- btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
- itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
- nritems++;
- }
- btrfs_set_header_bytenr(buf, cfg->blocks[2]);
- btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the chunk tree */
- memset(buf->data + sizeof(struct btrfs_header), 0,
- cfg->nodesize - sizeof(struct btrfs_header));
- nritems = 0;
- item_size = sizeof(*dev_item);
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
-
- /* first device 1 (there is no device 0) */
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, 1);
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
-
- dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
- btrfs_set_device_id(buf, dev_item, 1);
- btrfs_set_device_generation(buf, dev_item, 0);
- btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
- btrfs_set_device_bytes_used(buf, dev_item,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_type(buf, dev_item, 0);
-
- write_extent_buffer(buf, super.dev_item.uuid,
- (unsigned long)btrfs_device_uuid(dev_item),
- BTRFS_UUID_SIZE);
- write_extent_buffer(buf, super.fsid,
- (unsigned long)btrfs_device_fsid(dev_item),
- BTRFS_UUID_SIZE);
- read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
- sizeof(*dev_item));
-
- nritems++;
- item_size = btrfs_chunk_item_size(1);
- itemoff = itemoff - item_size;
-
- /* then we have chunk 0 */
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, 0);
- btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
-
- chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
- btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
- btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
- btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
- btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
- btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
- btrfs_set_chunk_num_stripes(buf, chunk, 1);
- btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
- btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
- nritems++;
-
- write_extent_buffer(buf, super.dev_item.uuid,
- (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
- BTRFS_UUID_SIZE);
-
- /* copy the key for the chunk to the system array */
- ptr = super.sys_chunk_array;
- array_size = sizeof(disk_key);
-
- memcpy(ptr, &disk_key, sizeof(disk_key));
- ptr += sizeof(disk_key);
-
- /* copy the chunk to the system array */
- read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
- array_size += item_size;
- ptr += item_size;
- btrfs_set_super_sys_array_size(&super, array_size);
-
- btrfs_set_header_bytenr(buf, cfg->blocks[3]);
- btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the device tree */
- memset(buf->data + sizeof(struct btrfs_header), 0,
- cfg->nodesize - sizeof(struct btrfs_header));
- nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
- sizeof(struct btrfs_dev_extent);
-
- btrfs_set_disk_key_objectid(&disk_key, 1);
- btrfs_set_disk_key_offset(&disk_key, 0);
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(struct btrfs_dev_extent));
- dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
- btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
- BTRFS_CHUNK_TREE_OBJECTID);
- btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
-
- write_extent_buffer(buf, chunk_tree_uuid,
- (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
- BTRFS_UUID_SIZE);
-
- btrfs_set_dev_extent_length(buf, dev_extent,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- nritems++;
-
- btrfs_set_header_bytenr(buf, cfg->blocks[4]);
- btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the FS root */
- memset(buf->data + sizeof(struct btrfs_header), 0,
- cfg->nodesize - sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(buf, cfg->blocks[5]);
- btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, 0);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
- /* finally create the csum root */
- memset(buf->data + sizeof(struct btrfs_header), 0,
- cfg->nodesize - sizeof(struct btrfs_header));
- btrfs_set_header_bytenr(buf, cfg->blocks[6]);
- btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, 0);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* and write out the super block */
- memset(buf->data, 0, BTRFS_SUPER_INFO_SIZE);
- memcpy(buf->data, &super, sizeof(super));
- buf->len = BTRFS_SUPER_INFO_SIZE;
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, cfg->blocks[0]);
- if (ret != BTRFS_SUPER_INFO_SIZE) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- ret = 0;
-
-out:
- free(buf);
- return ret;
-}
-
-static const struct btrfs_fs_feature {
- const char *name;
- u64 flag;
- const char *desc;
-} mkfs_features[] = {
- { "mixed-bg", BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS,
- "mixed data and metadata block groups" },
- { "extref", BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF,
- "increased hardlink limit per file to 65536" },
- { "raid56", BTRFS_FEATURE_INCOMPAT_RAID56,
- "raid56 extended format" },
- { "skinny-metadata", BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA,
- "reduced-size metadata extent refs" },
- { "no-holes", BTRFS_FEATURE_INCOMPAT_NO_HOLES,
- "no explicit hole extents for files" },
- /* Keep this one last */
- { "list-all", BTRFS_FEATURE_LIST_ALL, NULL }
-};
-
-static int parse_one_fs_feature(const char *name, u64 *flags)
-{
- int i;
- int found = 0;
-
- for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
- if (name[0] == '^' &&
- !strcmp(mkfs_features[i].name, name + 1)) {
- *flags &= ~ mkfs_features[i].flag;
- found = 1;
- } else if (!strcmp(mkfs_features[i].name, name)) {
- *flags |= mkfs_features[i].flag;
- found = 1;
- }
- }
-
- return !found;
-}
-
-void btrfs_parse_features_to_string(char *buf, u64 flags)
-{
- int i;
-
- buf[0] = 0;
-
- for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
- if (flags & mkfs_features[i].flag) {
- if (*buf)
- strcat(buf, ", ");
- strcat(buf, mkfs_features[i].name);
- }
- }
-}
-
-void btrfs_process_fs_features(u64 flags)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(mkfs_features); i++) {
- if (flags & mkfs_features[i].flag) {
- printf("Turning ON incompat feature '%s': %s\n",
- mkfs_features[i].name,
- mkfs_features[i].desc);
- }
- }
-}
-
-void btrfs_list_all_fs_features(u64 mask_disallowed)
-{
- int i;
-
- fprintf(stderr, "Filesystem features available:\n");
- for (i = 0; i < ARRAY_SIZE(mkfs_features) - 1; i++) {
- char *is_default = "";
-
- if (mkfs_features[i].flag & mask_disallowed)
- continue;
- if (mkfs_features[i].flag & BTRFS_MKFS_DEFAULT_FEATURES)
- is_default = ", default";
- fprintf(stderr, "%-20s- %s (0x%llx%s)\n",
- mkfs_features[i].name,
- mkfs_features[i].desc,
- mkfs_features[i].flag,
- is_default);
- }
-}
-
-/*
- * Return NULL if all features were parsed fine, otherwise return the name of
- * the first unparsed.
- */
-char* btrfs_parse_fs_features(char *namelist, u64 *flags)
-{
- char *this_char;
- char *save_ptr = NULL; /* Satisfy static checkers */
-
- for (this_char = strtok_r(namelist, ",", &save_ptr);
- this_char != NULL;
- this_char = strtok_r(NULL, ",", &save_ptr)) {
- if (parse_one_fs_feature(this_char, flags))
- return this_char;
- }
-
- return NULL;
-}
-