#include "ctree.h"
#include "disk-io.h"
+int mkfs(int fd, u64 num_blocks, u16 blocksize)
+{
+ struct btrfs_super_block super;
+ struct btrfs_leaf empty_leaf;
+ struct btrfs_root_item root_item;
+ struct btrfs_item item;
+ struct btrfs_extent_item extent_item;
+ char *block;
+ int ret;
+ u16 itemoff;
+
+ btrfs_set_super_blocknr(&super, 16);
+ btrfs_set_super_root(&super, 17);
+ strcpy((char *)(&super.magic), BTRFS_MAGIC);
+ btrfs_set_super_blocksize(&super, blocksize);
+ btrfs_set_super_total_blocks(&super, num_blocks);
+ btrfs_set_super_blocks_used(&super, 0);
+
+ block = malloc(blocksize);
+ memset(block, 0, blocksize);
+ BUG_ON(sizeof(super) > blocksize);
+ memcpy(block, &super, sizeof(super));
+ ret = pwrite(fd, block, blocksize, BTRFS_SUPER_INFO_OFFSET(blocksize));
+ BUG_ON(ret != blocksize);
+
+ /* create the tree of root objects */
+ memset(&empty_leaf, 0, sizeof(empty_leaf));
+ btrfs_set_header_parentid(&empty_leaf.header, BTRFS_ROOT_TREE_OBJECTID);
+ btrfs_set_header_blocknr(&empty_leaf.header, 17);
+ btrfs_set_header_nritems(&empty_leaf.header, 2);
+
+ /* create the items for the root tree */
+ btrfs_set_root_blocknr(&root_item, 18);
+ btrfs_set_root_refs(&root_item, 1);
+ itemoff = LEAF_DATA_SIZE - sizeof(root_item);
+ btrfs_set_item_offset(&item, itemoff);
+ btrfs_set_item_size(&item, sizeof(root_item));
+ btrfs_set_key_objectid(&item.key, BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_key_offset(&item.key, 0);
+ btrfs_set_key_flags(&item.key, 0);
+ memcpy(empty_leaf.items, &item, sizeof(item));
+ memcpy(empty_leaf.data + itemoff, &root_item, sizeof(root_item));
+
+ btrfs_set_root_blocknr(&root_item, 19);
+ itemoff = itemoff - sizeof(root_item);
+ btrfs_set_item_offset(&item, itemoff);
+ btrfs_set_key_objectid(&item.key, BTRFS_FS_TREE_OBJECTID);
+ memcpy(empty_leaf.items + 1, &item, sizeof(item));
+ memcpy(empty_leaf.data + itemoff, &root_item, sizeof(root_item));
+ ret = pwrite(fd, &empty_leaf, blocksize, 17 * blocksize);
+
+ /* create the items for the extent tree */
+ btrfs_set_header_parentid(&empty_leaf.header,
+ BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_header_blocknr(&empty_leaf.header, 18);
+ btrfs_set_header_nritems(&empty_leaf.header, 4);
+
+ /* item1, reserve blocks 0-16 */
+ btrfs_set_key_objectid(&item.key, 0);
+ btrfs_set_key_offset(&item.key, 17);
+ btrfs_set_key_flags(&item.key, 0);
+ itemoff = LEAF_DATA_SIZE - sizeof(struct btrfs_extent_item);
+ btrfs_set_item_offset(&item, itemoff);
+ btrfs_set_item_size(&item, sizeof(struct btrfs_extent_item));
+ btrfs_set_extent_refs(&extent_item, 1);
+ btrfs_set_extent_owner(&extent_item, 0);
+ memcpy(empty_leaf.items, &item, sizeof(item));
+ memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
+ btrfs_item_size(&item));
+
+ /* item2, give block 17 to the root */
+ btrfs_set_key_objectid(&item.key, 17);
+ btrfs_set_key_offset(&item.key, 1);
+ itemoff = itemoff - sizeof(struct btrfs_extent_item);
+ btrfs_set_item_offset(&item, itemoff);
+ btrfs_set_extent_owner(&extent_item, BTRFS_ROOT_TREE_OBJECTID);
+ memcpy(empty_leaf.items + 1, &item, sizeof(item));
+ memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
+ btrfs_item_size(&item));
+
+ /* item3, give block 18 to the extent root */
+ btrfs_set_key_objectid(&item.key, 18);
+ btrfs_set_key_offset(&item.key, 1);
+ itemoff = itemoff - sizeof(struct btrfs_extent_item);
+ btrfs_set_item_offset(&item, itemoff);
+ btrfs_set_extent_owner(&extent_item, BTRFS_EXTENT_TREE_OBJECTID);
+ memcpy(empty_leaf.items + 2, &item, sizeof(item));
+ memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
+ btrfs_item_size(&item));
+
+ /* item4, give block 19 to the FS root */
+ btrfs_set_key_objectid(&item.key, 19);
+ btrfs_set_key_offset(&item.key, 1);
+ itemoff = itemoff - sizeof(struct btrfs_extent_item);
+ btrfs_set_item_offset(&item, itemoff);
+ btrfs_set_extent_owner(&extent_item, BTRFS_FS_TREE_OBJECTID);
+ memcpy(empty_leaf.items + 3, &item, sizeof(item));
+ memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
+ btrfs_item_size(&item));
+ ret = pwrite(fd, &empty_leaf, blocksize, 18 * blocksize);
+ if (ret != sizeof(empty_leaf))
+ return -1;
+
+ /* finally create the FS root */
+ btrfs_set_header_parentid(&empty_leaf.header, BTRFS_FS_TREE_OBJECTID);
+ btrfs_set_header_blocknr(&empty_leaf.header, 19);
+ btrfs_set_header_nritems(&empty_leaf.header, 0);
+ ret = pwrite(fd, &empty_leaf, blocksize, 19 * blocksize);
+ if (ret != sizeof(empty_leaf))
+ return -1;
+ return 0;
+}
+
+#if 0
int mkfs(int fd)
{
- struct ctree_root_info info[2];
- struct leaf empty_leaf;
- struct item item;
- struct extent_item extent_item;
+ struct btrfs_root_info info[2];
+ struct btrfs_leaf empty_leaf;
+ struct btrfs_item item;
+ struct btrfs_extent_item extent_item;
int ret;
/* setup the super block area */
memset(info, 0, sizeof(info));
- info[0].blocknr = 16;
- info[0].objectid = 1;
- info[0].tree_root = 17;
+ btrfs_set_root_blocknr(info, 16);
+ btrfs_set_root_objectid(info, 1);
+ btrfs_set_root_tree_root(info, 17);
+
+ btrfs_set_root_blocknr(info + 1, 16);
+ btrfs_set_root_objectid(info + 1, 2);
+ btrfs_set_root_tree_root(info + 1, 18);
- info[1].blocknr = 16;
- info[1].objectid = 2;
- info[1].tree_root = 18;
ret = pwrite(fd, info, sizeof(info),
- CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
+ BTRFS_SUPER_INFO_OFFSET(BTRFS_BLOCKSIZE));
if (ret != sizeof(info))
return -1;
/* create leaves for the tree root and extent root */
memset(&empty_leaf, 0, sizeof(empty_leaf));
- empty_leaf.header.parentid = 1;
- empty_leaf.header.blocknr = 17;
- ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 17 * CTREE_BLOCKSIZE);
+ btrfs_set_header_parentid(&empty_leaf.header, 1);
+ btrfs_set_header_blocknr(&empty_leaf.header, 17);
+ ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 17 * BTRFS_BLOCKSIZE);
if (ret != sizeof(empty_leaf))
return -1;
- empty_leaf.header.parentid = 2;
- empty_leaf.header.blocknr = 18;
- empty_leaf.header.nritems = 3;
+ btrfs_set_header_parentid(&empty_leaf.header, 2);
+ btrfs_set_header_blocknr(&empty_leaf.header, 18);
+ btrfs_set_header_nritems(&empty_leaf.header, 3);
/* item1, reserve blocks 0-16 */
- item.key.objectid = 0;
- item.key.offset = 17;
- item.key.flags = 0;
- item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item);
- item.size = sizeof(struct extent_item);
- extent_item.refs = 1;
- extent_item.owner = 0;
+ btrfs_set_key_objectid(&item.key, 0);
+ btrfs_set_key_offset(&item.key, 17);
+ btrfs_set_key_flags(&item.key, 0);
+ btrfs_set_item_offset(&item, LEAF_DATA_SIZE -
+ sizeof(struct btrfs_extent_item));
+ btrfs_set_item_size(&item, sizeof(struct btrfs_extent_item));
+ btrfs_set_extent_refs(&extent_item, 1);
+ btrfs_set_extent_owner(&extent_item, 0);
memcpy(empty_leaf.items, &item, sizeof(item));
- memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
+ memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
+ btrfs_item_size(&item));
/* item2, give block 17 to the root */
- item.key.objectid = 17;
- item.key.offset = 1;
- item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 2;
- extent_item.owner = 1;
+ btrfs_set_key_objectid(&item.key, 17);
+ btrfs_set_key_offset(&item.key, 1);
+ btrfs_set_item_offset(&item, LEAF_DATA_SIZE -
+ sizeof(struct btrfs_extent_item) * 2);
+ btrfs_set_extent_owner(&extent_item, 1);
memcpy(empty_leaf.items + 1, &item, sizeof(item));
- memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
+ memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
+ btrfs_item_size(&item));
/* item3, give block 18 for the extent root */
- item.key.objectid = 18;
- item.key.offset = 1;
- item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 3;
- extent_item.owner = 2;
+ btrfs_set_key_objectid(&item.key, 18);
+ btrfs_set_key_offset(&item.key, 1);
+ btrfs_set_item_offset(&item, LEAF_DATA_SIZE -
+ sizeof(struct btrfs_extent_item) * 3);
+ btrfs_set_extent_owner(&extent_item, 2);
memcpy(empty_leaf.items + 2, &item, sizeof(item));
- memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
- ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 18 * CTREE_BLOCKSIZE);
+ memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item,
+ btrfs_item_size(&item));
+ ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 18 * BTRFS_BLOCKSIZE);
if (ret != sizeof(empty_leaf))
return -1;
return 0;
}
+#endif
projects / linux-2.6-block.git / blobdiff