78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
#define _XOPEN_SOURCE 500
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include "kerncompat.h"
|
|
#include "radix-tree.h"
|
|
#include "ctree.h"
|
|
#include "disk-io.h"
|
|
|
|
int mkfs(int fd)
|
|
{
|
|
struct ctree_root_info info[2];
|
|
struct leaf empty_leaf;
|
|
struct item item;
|
|
struct 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;
|
|
|
|
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));
|
|
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);
|
|
if (ret != sizeof(empty_leaf))
|
|
return -1;
|
|
|
|
empty_leaf.header.parentid = 2;
|
|
empty_leaf.header.blocknr = 18;
|
|
empty_leaf.header.nritems = 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;
|
|
memcpy(empty_leaf.items, &item, sizeof(item));
|
|
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
|
|
|
|
/* 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;
|
|
memcpy(empty_leaf.items + 1, &item, sizeof(item));
|
|
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
|
|
|
|
/* 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;
|
|
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);
|
|
if (ret != sizeof(empty_leaf))
|
|
return -1;
|
|
return 0;
|
|
}
|