int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb, struct btrfs_device *device) { u64 bytenr; u32 crc; int i, ret; if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) { btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr); crc = ~(u32)0; 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]); /* * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is * zero filled, we can use it directly */ ret = pwrite64(device->fd, root->fs_info->super_copy, BTRFS_SUPER_INFO_SIZE, root->fs_info->super_bytenr); BUG_ON(ret != BTRFS_SUPER_INFO_SIZE); return 0; } for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { bytenr = btrfs_sb_offset(i); if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes) break; btrfs_set_super_bytenr(sb, bytenr); crc = ~(u32)0; 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]); /* * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is * zero filled, we can use it directly */ ret = pwrite64(device->fd, root->fs_info->super_copy, BTRFS_SUPER_INFO_SIZE, bytenr); BUG_ON(ret != BTRFS_SUPER_INFO_SIZE); } return 0; }
int make_btrfs(int fd, const char *device, const char *label, u64 blocks[7], u64 num_bytes, u32 nodesize, u32 leafsize, u32 sectorsize, u32 stripesize, u64 features) { 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 = !!(features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA); first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1; first_free &= ~((u64)sectorsize - 1); memset(&super, 0, sizeof(super)); num_bytes = (num_bytes / sectorsize) * sectorsize; uuid_generate(super.fsid); uuid_generate(super.dev_item.uuid); uuid_generate(chunk_tree_uuid); btrfs_set_super_bytenr(&super, blocks[0]); btrfs_set_super_num_devices(&super, 1); btrfs_set_super_magic(&super, BTRFS_MAGIC); btrfs_set_super_generation(&super, 1); btrfs_set_super_root(&super, blocks[1]); btrfs_set_super_chunk_root(&super, blocks[3]); btrfs_set_super_total_bytes(&super, num_bytes); btrfs_set_super_bytes_used(&super, 6 * leafsize); btrfs_set_super_sectorsize(&super, sectorsize); btrfs_set_super_leafsize(&super, leafsize); btrfs_set_super_nodesize(&super, nodesize); btrfs_set_super_stripesize(&super, 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, features); if (label) strncpy(super.label, label, BTRFS_LABEL_SIZE - 1); buf = malloc(sizeof(*buf) + max(sectorsize, leafsize)); /* create the tree of root objects */ memset(buf->data, 0, leafsize); buf->len = leafsize; btrfs_set_header_bytenr(buf, 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, (unsigned long) 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, leafsize); btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); btrfs_set_root_refs(&root_item, 1); btrfs_set_root_used(&root_item, leafsize); 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(leafsize) - sizeof(root_item); btrfs_set_root_bytenr(&root_item, 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, 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, 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, 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, leafsize, blocks[1]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* create the items for the extent tree */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); nritems = 0; itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize); 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(blocks[i] < first_free); BUG_ON(blocks[i] < blocks[i - 1]); /* create extent item */ itemoff -= item_size; btrfs_set_disk_key_objectid(&disk_key, 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, leafsize); } 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, 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, 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, leafsize, blocks[2]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* create the chunk tree */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); nritems = 0; item_size = sizeof(*dev_item); itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - 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, sectorsize); btrfs_set_device_io_width(buf, dev_item, sectorsize); btrfs_set_device_sector_size(buf, dev_item, 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, sectorsize); btrfs_set_chunk_io_width(buf, chunk, sectorsize); btrfs_set_chunk_sector_size(buf, chunk, 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, 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, leafsize, blocks[3]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* create the device tree */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); nritems = 0; itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - 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, 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, leafsize, blocks[4]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* create the FS root */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); btrfs_set_header_bytenr(buf, 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, leafsize, blocks[5]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* finally create the csum root */ memset(buf->data+sizeof(struct btrfs_header), 0, leafsize-sizeof(struct btrfs_header)); btrfs_set_header_bytenr(buf, 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, leafsize, blocks[6]); if (ret != leafsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } /* and write out the super block */ BUG_ON(sizeof(super) > sectorsize); memset(buf->data, 0, sectorsize); memcpy(buf->data, &super, sizeof(super)); buf->len = sectorsize; csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0); ret = pwrite(fd, buf->data, sectorsize, blocks[0]); if (ret != sectorsize) { ret = (ret < 0 ? -errno : -EIO); goto out; } ret = 0; out: free(buf); return ret; }
int btrfs_add_to_fsid(struct btrfs_trans_handle *trans, struct btrfs_root *root, int fd, char *path, u64 block_count, u32 io_width, u32 io_align, u32 sectorsize) { struct btrfs_super_block *disk_super; struct btrfs_super_block *super = root->fs_info->super_copy; struct btrfs_device *device; struct btrfs_dev_item *dev_item; char *buf; u64 total_bytes; u64 num_devs; int ret; device = kzalloc(sizeof(*device), GFP_NOFS); if (!device) return -ENOMEM; buf = kmalloc(sectorsize, GFP_NOFS); if (!buf) { kfree(device); return -ENOMEM; } BUG_ON(sizeof(*disk_super) > sectorsize); memset(buf, 0, sectorsize); disk_super = (struct btrfs_super_block *)buf; dev_item = &disk_super->dev_item; uuid_generate(device->uuid); device->devid = 0; device->type = 0; device->io_width = io_width; device->io_align = io_align; device->sector_size = sectorsize; device->fd = fd; device->writeable = 1; device->total_bytes = block_count; device->bytes_used = 0; device->total_ios = 0; device->dev_root = root->fs_info->dev_root; ret = btrfs_add_device(trans, root, device); BUG_ON(ret); total_bytes = btrfs_super_total_bytes(super) + block_count; btrfs_set_super_total_bytes(super, total_bytes); num_devs = btrfs_super_num_devices(super) + 1; btrfs_set_super_num_devices(super, num_devs); memcpy(disk_super, super, sizeof(*disk_super)); printf("adding device %s id %llu\n", path, (unsigned long long)device->devid); btrfs_set_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET); btrfs_set_stack_device_id(dev_item, device->devid); btrfs_set_stack_device_type(dev_item, device->type); btrfs_set_stack_device_io_align(dev_item, device->io_align); btrfs_set_stack_device_io_width(dev_item, device->io_width); btrfs_set_stack_device_sector_size(dev_item, device->sector_size); btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes); btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used); memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE); ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET); BUG_ON(ret != sectorsize); kfree(buf); list_add(&device->dev_list, &root->fs_info->fs_devices->devices); device->fs_devices = root->fs_info->fs_devices; return 0; }