diff options
Diffstat (limited to 'utils.c')
| -rw-r--r-- | utils.c | 160 |
1 files changed, 145 insertions, 15 deletions
@@ -32,13 +32,16 @@ #include "transaction.h" #include "crc32c.h" #include "utils.h" -static u64 reference_root_table[4] = { +static u64 reference_root_table[6] = { [1] = BTRFS_ROOT_TREE_OBJECTID, [2] = BTRFS_EXTENT_TREE_OBJECTID, - [3] = BTRFS_FS_TREE_OBJECTID, + [3] = BTRFS_CHUNK_TREE_OBJECTID, + [4] = BTRFS_DEV_TREE_OBJECTID, + [5] = BTRFS_FS_TREE_OBJECTID, }; -int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize, +int make_btrfs(int fd, char *device_name, + u64 blocks[6], u64 num_bytes, u32 nodesize, u32 leafsize, u32 sectorsize, u32 stripesize) { struct btrfs_super_block super; @@ -48,6 +51,10 @@ int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize, struct btrfs_extent_ref *extent_ref; 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 *ptr; int i; int ret; u32 itemoff; @@ -56,6 +63,8 @@ int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize, u64 first_free; u64 ref_gen; u64 ref_root; + u32 array_size; + u32 item_size; first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1; first_free &= ~((u64)sectorsize - 1); @@ -66,27 +75,24 @@ int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize, strncpy((char *)&super.magic, BTRFS_MAGIC, sizeof(super.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, first_free + 3 * leafsize); + btrfs_set_super_bytes_used(&super, first_free + 5 * leafsize); btrfs_set_super_root_dir(&super, 0); 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_root_level(&super, 0); + btrfs_set_super_chunk_root_level(&super, 0); + btrfs_set_super_sys_array_size(&super, 0); buf = malloc(sizeof(*buf) + max(sectorsize, leafsize)); - BUG_ON(sizeof(super) > sectorsize); - memset(buf->data, 0, sectorsize); - memcpy(buf->data, &super, sizeof(super)); - ret = pwrite(fd, buf->data, sectorsize, blocks[0]); - BUG_ON(ret != sectorsize); - /* create the tree of root objects */ memset(buf->data, 0, leafsize); btrfs_set_header_bytenr(buf, blocks[1]); - btrfs_set_header_nritems(buf, 2); + btrfs_set_header_nritems(buf, 3); btrfs_set_header_generation(buf, 1); btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID); write_extent_buffer(buf, super.fsid, (unsigned long) @@ -117,13 +123,23 @@ int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize, sizeof(root_item)); itemoff = itemoff - sizeof(root_item); - btrfs_set_root_bytenr(&root_item, blocks[3]); + 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, 1); btrfs_set_item_offset(buf, btrfs_item_nr(buf, 1), itemoff); btrfs_set_item_size(buf, btrfs_item_nr(buf, 1), sizeof(root_item)); write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, 1), sizeof(root_item)); + + 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, 2); + btrfs_set_item_offset(buf, btrfs_item_nr(buf, 2), itemoff); + btrfs_set_item_size(buf, btrfs_item_nr(buf, 2), sizeof(root_item)); + write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf, 2), + sizeof(root_item)); + ret = pwrite(fd, buf->data, leafsize, blocks[1]); BUG_ON(ret != leafsize); @@ -140,7 +156,7 @@ int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize, extent_item = btrfs_item_ptr(buf, nritems, struct btrfs_extent_item); btrfs_set_extent_refs(buf, extent_item, 1); nritems++; - for (i = 1; i < 4; i++) { + for (i = 1; i < 6; i++) { BUG_ON(blocks[i] < first_free); BUG_ON(blocks[i] < blocks[i - 1]); @@ -190,13 +206,127 @@ int make_btrfs(int fd, u64 blocks[4], u64 num_bytes, u32 nodesize, ret = pwrite(fd, buf->data, leafsize, blocks[2]); BUG_ON(ret != leafsize); - /* finally create the FS root */ + /* create the chunk tree */ + nritems = 0; + item_size = btrfs_chunk_item_size(1); + itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size; + + /* first we have chunk 0 */ + btrfs_set_disk_key_objectid(&disk_key, 0); + btrfs_set_disk_key_offset(&disk_key, BTRFS_MKFS_SYSTEM_GROUP_SIZE); + 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(buf, nritems), itemoff); + btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size); + + chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk); + 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); + + /* 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; + + /* then device 1 (there is no device 0) */ + nritems++; + item_size = sizeof(*dev_item) + strlen(device_name); + itemoff = itemoff - item_size; + 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(buf, nritems), itemoff); + btrfs_set_item_size(buf, btrfs_item_nr(buf, 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_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_rdev(buf, dev_item, 0); + btrfs_set_device_type(buf, dev_item, 0); + btrfs_set_device_partition(buf, dev_item, 0); + btrfs_set_device_name_len(buf, dev_item, strlen(device_name)); + nritems++; + + memset_extent_buffer(buf, 0, (unsigned long)btrfs_device_uuid(dev_item), + BTRFS_DEV_UUID_SIZE); + write_extent_buffer(buf, device_name, + (unsigned long)btrfs_device_name(dev_item), + strlen(device_name)); + + /* copy the device item and key into the system array */ + memcpy(ptr, &disk_key, sizeof(disk_key)); + ptr += sizeof(disk_key); + array_size += sizeof(disk_key); + + read_extent_buffer(buf, ptr, (unsigned long)dev_item, 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); + ret = pwrite(fd, buf->data, leafsize, blocks[3]); + + /* create the device tree */ + 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(buf, nritems), itemoff); + btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), + sizeof(struct btrfs_dev_extent)); + dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent); + btrfs_set_dev_extent_owner(buf, dev_extent, 0); + 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); + ret = pwrite(fd, buf->data, leafsize, blocks[4]); + + /* finally create the FS root */ + btrfs_set_header_bytenr(buf, blocks[5]); btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID); btrfs_set_header_nritems(buf, 0); - ret = pwrite(fd, buf->data, leafsize, blocks[3]); + ret = pwrite(fd, buf->data, leafsize, blocks[5]); BUG_ON(ret != leafsize); + /* and write out the super block */ + BUG_ON(sizeof(super) > sectorsize); + memset(buf->data, 0, sectorsize); + memcpy(buf->data, &super, sizeof(super)); + ret = pwrite(fd, buf->data, sectorsize, blocks[0]); + BUG_ON(ret != sectorsize); + + free(buf); return 0; } |