diff options
Diffstat (limited to 'mkfs.c')
| -rw-r--r-- | mkfs.c | 72 |
1 files changed, 56 insertions, 16 deletions
@@ -99,7 +99,7 @@ err: return ret; } -int mkfs(int fd, u64 num_blocks, u32 blocksize) +int mkfs(int fd, char *pathname, u64 num_blocks, u32 blocksize) { struct btrfs_super_block super; struct btrfs_leaf *empty_leaf; @@ -107,10 +107,13 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize) struct btrfs_item item; struct btrfs_extent_item extent_item; struct btrfs_inode_item *inode_item; + struct btrfs_device_item dev_item; char *block; int ret; u32 itemoff; u32 start_block = BTRFS_SUPER_INFO_OFFSET / blocksize; + u16 item_size; + btrfs_set_super_generation(&super, 1); btrfs_set_super_blocknr(&super, start_block); btrfs_set_super_root(&super, start_block + 1); @@ -118,6 +121,9 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize) btrfs_set_super_blocksize(&super, blocksize); btrfs_set_super_total_blocks(&super, num_blocks); btrfs_set_super_blocks_used(&super, start_block + 4); + btrfs_set_super_device_block_start(&super, 0); + btrfs_set_super_device_num_blocks(&super, num_blocks); + btrfs_set_super_device_root(&super, start_block + 2); uuid_generate(super.fsid); block = malloc(blocksize); @@ -146,20 +152,21 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize) btrfs_set_inode_mode(inode_item, S_IFDIR | 0755); btrfs_set_root_dirid(&root_item, 0); - btrfs_set_root_blocknr(&root_item, start_block + 2); btrfs_set_root_refs(&root_item, 1); - itemoff = __BTRFS_LEAF_DATA_SIZE(blocksize) - sizeof(root_item); - btrfs_set_item_offset(&item, itemoff); - btrfs_set_item_size(&item, sizeof(root_item)); - btrfs_set_disk_key_objectid(&item.key, BTRFS_EXTENT_TREE_OBJECTID); btrfs_set_disk_key_offset(&item.key, 0); btrfs_set_disk_key_flags(&item.key, 0); + btrfs_set_item_size(&item, sizeof(root_item)); btrfs_set_disk_key_type(&item.key, BTRFS_ROOT_ITEM_KEY); + + itemoff = __BTRFS_LEAF_DATA_SIZE(blocksize) - sizeof(root_item); + btrfs_set_root_blocknr(&root_item, start_block + 3); + btrfs_set_item_offset(&item, itemoff); + btrfs_set_disk_key_objectid(&item.key, BTRFS_EXTENT_TREE_OBJECTID); memcpy(empty_leaf->items, &item, sizeof(item)); memcpy(btrfs_leaf_data(empty_leaf) + itemoff, &root_item, sizeof(root_item)); - btrfs_set_root_blocknr(&root_item, start_block + 3); + btrfs_set_root_blocknr(&root_item, start_block + 4); itemoff = itemoff - sizeof(root_item); btrfs_set_item_offset(&item, itemoff); btrfs_set_disk_key_objectid(&item.key, BTRFS_FS_TREE_OBJECTID); @@ -168,9 +175,31 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize) &root_item, sizeof(root_item)); ret = pwrite(fd, empty_leaf, blocksize, (start_block + 1) * blocksize); - /* create the items for the extent tree */ + /* create the item for the dev tree */ btrfs_set_header_blocknr(&empty_leaf->header, start_block + 2); - btrfs_set_header_nritems(&empty_leaf->header, 4); + btrfs_set_header_nritems(&empty_leaf->header, 1); + btrfs_set_disk_key_objectid(&item.key, 0); + btrfs_set_disk_key_offset(&item.key, num_blocks); + btrfs_set_disk_key_flags(&item.key, 0); + btrfs_set_disk_key_type(&item.key, BTRFS_DEV_ITEM_KEY); + + item_size = sizeof(struct btrfs_device_item) + strlen(pathname); + itemoff = __BTRFS_LEAF_DATA_SIZE(blocksize) - item_size; + btrfs_set_item_offset(&item, itemoff); + btrfs_set_item_size(&item, item_size); + btrfs_set_device_pathlen(&dev_item, strlen(pathname)); + memcpy(empty_leaf->items, &item, sizeof(item)); + memcpy(btrfs_leaf_data(empty_leaf) + itemoff, &dev_item, + sizeof(dev_item)); + memcpy(btrfs_leaf_data(empty_leaf) + itemoff + sizeof(dev_item), + pathname, strlen(pathname)); + ret = pwrite(fd, empty_leaf, blocksize, (start_block + 2) * blocksize); + if (ret != blocksize) + return -1; + + /* create the items for the extent tree */ + btrfs_set_header_blocknr(&empty_leaf->header, start_block + 3); + btrfs_set_header_nritems(&empty_leaf->header, 5); /* item1, reserve blocks 0-16 */ btrfs_set_disk_key_objectid(&item.key, 0); @@ -195,7 +224,7 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize) memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item), &extent_item, btrfs_item_size(&item)); - /* item3, give block 18 to the extent root */ + /* item3, give block 18 to the dev root */ btrfs_set_disk_key_objectid(&item.key, start_block + 2); btrfs_set_disk_key_offset(&item.key, 1); itemoff = itemoff - sizeof(struct btrfs_extent_item); @@ -204,7 +233,7 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize) memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item), &extent_item, btrfs_item_size(&item)); - /* item5, give block 19 to the FS root */ + /* item4, give block 19 to the extent root */ btrfs_set_disk_key_objectid(&item.key, start_block + 3); btrfs_set_disk_key_offset(&item.key, 1); itemoff = itemoff - sizeof(struct btrfs_extent_item); @@ -212,14 +241,23 @@ int mkfs(int fd, u64 num_blocks, u32 blocksize) memcpy(empty_leaf->items + 3, &item, sizeof(item)); memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item), &extent_item, btrfs_item_size(&item)); - ret = pwrite(fd, empty_leaf, blocksize, (start_block + 2) * blocksize); + + /* item5, give block 20 to the FS root */ + btrfs_set_disk_key_objectid(&item.key, start_block + 4); + btrfs_set_disk_key_offset(&item.key, 1); + itemoff = itemoff - sizeof(struct btrfs_extent_item); + btrfs_set_item_offset(&item, itemoff); + memcpy(empty_leaf->items + 4, &item, sizeof(item)); + memcpy(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item), + &extent_item, btrfs_item_size(&item)); + ret = pwrite(fd, empty_leaf, blocksize, (start_block + 3) * blocksize); if (ret != blocksize) return -1; /* finally create the FS root */ - btrfs_set_header_blocknr(&empty_leaf->header, start_block + 3); + btrfs_set_header_blocknr(&empty_leaf->header, start_block + 4); btrfs_set_header_nritems(&empty_leaf->header, 0); - ret = pwrite(fd, empty_leaf, blocksize, (start_block + 3) * blocksize); + ret = pwrite(fd, empty_leaf, blocksize, (start_block + 4) * blocksize); if (ret != blocksize) return -1; return 0; @@ -248,6 +286,7 @@ int main(int ac, char **av) int ret; int i; char *buf = malloc(4096); + char *realpath_name; radix_tree_init(); @@ -287,14 +326,15 @@ int main(int ac, char **av) exit(1); } memset(buf, 0, 4096); - for(i = 0; i < 16; i++) { + for(i = 0; i < 64; i++) { ret = write(fd, buf, 4096); if (ret != 4096) { fprintf(stderr, "unable to zero fill device\n"); exit(1); } } - ret = mkfs(fd, block_count, 4096); + realpath_name = realpath(file, NULL); + ret = mkfs(fd, realpath_name, block_count, 4096); if (ret) { fprintf(stderr, "error during mkfs %d\n", ret); exit(1); |