Commit | Line | Data |
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06ed4b31 CM |
1 | #define _XOPEN_SOURCE 500 |
2 | #include <stdio.h> | |
3 | #include <stdlib.h> | |
4 | #include <sys/types.h> | |
5 | #include <sys/stat.h> | |
6 | #include <fcntl.h> | |
7 | #include <unistd.h> | |
8 | #include "kerncompat.h" | |
9 | #include "radix-tree.h" | |
10 | #include "ctree.h" | |
11 | #include "disk-io.h" | |
12 | ||
13 | int mkfs(int fd) | |
14 | { | |
234b63a0 CM |
15 | struct btrfs_root_info info[2]; |
16 | struct btrfs_leaf empty_leaf; | |
0783fcfc | 17 | struct btrfs_item item; |
234b63a0 | 18 | struct btrfs_extent_item extent_item; |
06ed4b31 CM |
19 | int ret; |
20 | ||
cfaa7295 | 21 | /* setup the super block area */ |
06ed4b31 CM |
22 | memset(info, 0, sizeof(info)); |
23 | info[0].blocknr = 16; | |
24 | info[0].objectid = 1; | |
25 | info[0].tree_root = 17; | |
06ed4b31 CM |
26 | |
27 | info[1].blocknr = 16; | |
28 | info[1].objectid = 2; | |
9a8dd150 | 29 | info[1].tree_root = 18; |
06ed4b31 | 30 | ret = pwrite(fd, info, sizeof(info), |
234b63a0 | 31 | BTRFS_SUPER_INFO_OFFSET(BTRFS_BLOCKSIZE)); |
06ed4b31 CM |
32 | if (ret != sizeof(info)) |
33 | return -1; | |
cfaa7295 CM |
34 | |
35 | /* create leaves for the tree root and extent root */ | |
06ed4b31 | 36 | memset(&empty_leaf, 0, sizeof(empty_leaf)); |
7518a238 CM |
37 | btrfs_set_header_parentid(&empty_leaf.header, 1); |
38 | btrfs_set_header_blocknr(&empty_leaf.header, 17); | |
234b63a0 | 39 | ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 17 * BTRFS_BLOCKSIZE); |
06ed4b31 CM |
40 | if (ret != sizeof(empty_leaf)) |
41 | return -1; | |
42 | ||
7518a238 CM |
43 | btrfs_set_header_parentid(&empty_leaf.header, 2); |
44 | btrfs_set_header_blocknr(&empty_leaf.header, 18); | |
45 | btrfs_set_header_nritems(&empty_leaf.header, 3); | |
9a8dd150 CM |
46 | |
47 | /* item1, reserve blocks 0-16 */ | |
0783fcfc CM |
48 | btrfs_set_key_objectid(&item.key, 0); |
49 | btrfs_set_key_offset(&item.key, 17); | |
50 | btrfs_set_key_flags(&item.key, 0); | |
234b63a0 CM |
51 | btrfs_set_item_offset(&item, LEAF_DATA_SIZE - |
52 | sizeof(struct btrfs_extent_item)); | |
53 | btrfs_set_item_size(&item, sizeof(struct btrfs_extent_item)); | |
cf27e1ee CM |
54 | btrfs_set_extent_refs(&extent_item, 1); |
55 | btrfs_set_extent_owner(&extent_item, 0); | |
06ed4b31 | 56 | memcpy(empty_leaf.items, &item, sizeof(item)); |
0783fcfc CM |
57 | memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item, |
58 | btrfs_item_size(&item)); | |
9a8dd150 CM |
59 | |
60 | /* item2, give block 17 to the root */ | |
0783fcfc CM |
61 | btrfs_set_key_objectid(&item.key, 17); |
62 | btrfs_set_key_offset(&item.key, 1); | |
234b63a0 CM |
63 | btrfs_set_item_offset(&item, LEAF_DATA_SIZE - |
64 | sizeof(struct btrfs_extent_item) * 2); | |
cf27e1ee | 65 | btrfs_set_extent_owner(&extent_item, 1); |
06ed4b31 | 66 | memcpy(empty_leaf.items + 1, &item, sizeof(item)); |
0783fcfc CM |
67 | memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item, |
68 | btrfs_item_size(&item)); | |
9a8dd150 CM |
69 | |
70 | /* item3, give block 18 for the extent root */ | |
0783fcfc CM |
71 | btrfs_set_key_objectid(&item.key, 18); |
72 | btrfs_set_key_offset(&item.key, 1); | |
234b63a0 CM |
73 | btrfs_set_item_offset(&item, LEAF_DATA_SIZE - |
74 | sizeof(struct btrfs_extent_item) * 3); | |
cf27e1ee | 75 | btrfs_set_extent_owner(&extent_item, 2); |
9a8dd150 | 76 | memcpy(empty_leaf.items + 2, &item, sizeof(item)); |
0783fcfc CM |
77 | memcpy(empty_leaf.data + btrfs_item_offset(&item), &extent_item, |
78 | btrfs_item_size(&item)); | |
234b63a0 | 79 | ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 18 * BTRFS_BLOCKSIZE); |
06ed4b31 CM |
80 | if (ret != sizeof(empty_leaf)) |
81 | return -1; | |
82 | return 0; | |
83 | } |