diff options
| -rw-r--r-- | btrfs-convert.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/btrfs-convert.c b/btrfs-convert.c index 4489c58c..47028d9a 100644 --- a/btrfs-convert.c +++ b/btrfs-convert.c @@ -2329,6 +2329,67 @@ static int make_convert_data_block_groups(struct btrfs_trans_handle *trans, return ret; } +/* + * Init the temp btrfs to a operational status. + * + * It will fix the extent usage accounting(XXX: Do we really need?) and + * insert needed data chunks, to ensure all old fs data extents are covered + * by DATA chunks, preventing wrong chunks are allocated. + * + * And also create convert image subvolume and relocation tree. + * (XXX: Not need again?) + * But the convert image subvolume is *NOT* linked to fs tree yet. + */ +static int init_btrfs_v2(struct btrfs_mkfs_config *cfg, struct btrfs_root *root, + struct btrfs_convert_context *cctx, int datacsum, + int packing, int noxattr) +{ + struct btrfs_key location; + struct btrfs_trans_handle *trans; + struct btrfs_fs_info *fs_info = root->fs_info; + int ret; + + trans = btrfs_start_transaction(root, 1); + BUG_ON(!trans); + ret = btrfs_fix_block_accounting(trans, root); + if (ret) + goto err; + ret = make_convert_data_block_groups(trans, fs_info, cfg, cctx); + if (ret) + goto err; + ret = btrfs_make_root_dir(trans, fs_info->tree_root, + BTRFS_ROOT_TREE_DIR_OBJECTID); + if (ret) + goto err; + memcpy(&location, &root->root_key, sizeof(location)); + location.offset = (u64)-1; + ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7, + btrfs_super_root_dir(fs_info->super_copy), + &location, BTRFS_FT_DIR, 0); + if (ret) + goto err; + ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7, + location.objectid, + btrfs_super_root_dir(fs_info->super_copy), 0); + if (ret) + goto err; + btrfs_set_root_dirid(&fs_info->fs_root->root_item, + BTRFS_FIRST_FREE_OBJECTID); + + /* subvol for fs image file */ + ret = create_subvol(trans, root, CONV_IMAGE_SUBVOL_OBJECTID); + if (ret < 0) + goto err; + /* subvol for data relocation tree */ + ret = create_subvol(trans, root, BTRFS_DATA_RELOC_TREE_OBJECTID); + if (ret < 0) + goto err; + + ret = btrfs_commit_transaction(trans, root); +err: + return ret; +} + static int init_btrfs(struct btrfs_root *root) { int ret; |