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 | { | |
15 | struct ctree_root_info info[2]; | |
16 | struct leaf empty_leaf; | |
17 | struct item item; | |
18 | struct extent_item extent_item; | |
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 CM |
30 | ret = pwrite(fd, info, sizeof(info), |
31 | CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE)); | |
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); | |
06ed4b31 CM |
39 | ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 17 * CTREE_BLOCKSIZE); |
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 */ | |
06ed4b31 | 48 | item.key.objectid = 0; |
9a8dd150 | 49 | item.key.offset = 17; |
06ed4b31 CM |
50 | item.key.flags = 0; |
51 | item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item); | |
52 | item.size = sizeof(struct extent_item); | |
53 | extent_item.refs = 1; | |
9a8dd150 | 54 | extent_item.owner = 0; |
06ed4b31 CM |
55 | memcpy(empty_leaf.items, &item, sizeof(item)); |
56 | memcpy(empty_leaf.data + item.offset, &extent_item, item.size); | |
9a8dd150 CM |
57 | |
58 | /* item2, give block 17 to the root */ | |
59 | item.key.objectid = 17; | |
60 | item.key.offset = 1; | |
06ed4b31 | 61 | item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 2; |
9a8dd150 | 62 | extent_item.owner = 1; |
06ed4b31 CM |
63 | memcpy(empty_leaf.items + 1, &item, sizeof(item)); |
64 | memcpy(empty_leaf.data + item.offset, &extent_item, item.size); | |
9a8dd150 CM |
65 | |
66 | /* item3, give block 18 for the extent root */ | |
67 | item.key.objectid = 18; | |
68 | item.key.offset = 1; | |
69 | item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 3; | |
70 | extent_item.owner = 2; | |
71 | memcpy(empty_leaf.items + 2, &item, sizeof(item)); | |
72 | memcpy(empty_leaf.data + item.offset, &extent_item, item.size); | |
73 | ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 18 * CTREE_BLOCKSIZE); | |
06ed4b31 CM |
74 | if (ret != sizeof(empty_leaf)) |
75 | return -1; | |
76 | return 0; | |
77 | } |