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-rw-r--r--fs/btrfs/mkfs.c255
1 files changed, 0 insertions, 255 deletions
diff --git a/fs/btrfs/mkfs.c b/fs/btrfs/mkfs.c
deleted file mode 100644
index f7efc8a5fb1..00000000000
--- a/fs/btrfs/mkfs.c
+++ /dev/null
@@ -1,255 +0,0 @@
-#define _XOPEN_SOURCE 500
-#ifndef __CHECKER__
-#include <sys/ioctl.h>
-#include <sys/mount.h>
-#endif
-#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"
-
-#ifdef __CHECKER__
-#define BLKGETSIZE64 0
-static inline int ioctl(int fd, int define, u64 *size) { return 0; }
-#endif
-
-#if 0
-#if defined(__linux__) && defined(_IOR) && !defined(BLKGETSIZE64)
-# define BLKGETSIZE64 _IOR(0x12, 114, __u64)
-#endif
-#endif
-
-int mkfs(int fd, u64 num_blocks, u32 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;
- u32 itemoff;
- u32 start_block = BTRFS_SUPER_INFO_OFFSET / blocksize;
-
- btrfs_set_super_blocknr(&super, start_block);
- btrfs_set_super_root(&super, start_block + 1);
- 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, start_block + 5);
-
- 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);
- BUG_ON(ret != blocksize);
-
- /* create the tree of root objects */
- empty_leaf = malloc(blocksize);
- memset(empty_leaf, 0, blocksize);
- btrfs_set_header_parentid(&empty_leaf->header,
- BTRFS_ROOT_TREE_OBJECTID);
- btrfs_set_header_blocknr(&empty_leaf->header, start_block + 1);
- btrfs_set_header_nritems(&empty_leaf->header, 3);
-
- /* create the items for the root tree */
- 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_disk_key_type(&item.key, BTRFS_ROOT_ITEM_KEY);
- 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);
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_item_offset(&item, itemoff);
- btrfs_set_disk_key_objectid(&item.key, BTRFS_INODE_MAP_OBJECTID);
- memcpy(empty_leaf->items + 1, &item, sizeof(item));
- memcpy(btrfs_leaf_data(empty_leaf) + itemoff,
- &root_item, sizeof(root_item));
-
- 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);
- memcpy(empty_leaf->items + 2, &item, sizeof(item));
- memcpy(btrfs_leaf_data(empty_leaf) + itemoff,
- &root_item, sizeof(root_item));
- ret = pwrite(fd, empty_leaf, blocksize, (start_block + 1) * 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, start_block + 2);
- btrfs_set_header_nritems(&empty_leaf->header, 5);
-
- /* item1, reserve blocks 0-16 */
- btrfs_set_disk_key_objectid(&item.key, 0);
- btrfs_set_disk_key_offset(&item.key, start_block + 1);
- btrfs_set_disk_key_flags(&item.key, 0);
- btrfs_set_disk_key_type(&item.key, BTRFS_EXTENT_ITEM_KEY);
- itemoff = __BTRFS_LEAF_DATA_SIZE(blocksize) -
- 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(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
- &extent_item, btrfs_item_size(&item));
-
- /* item2, give block 17 to the root */
- btrfs_set_disk_key_objectid(&item.key, start_block + 1);
- btrfs_set_disk_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(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
- &extent_item, btrfs_item_size(&item));
-
- /* item3, give block 18 to the extent 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);
- 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(btrfs_leaf_data(empty_leaf) + btrfs_item_offset(&item),
- &extent_item, btrfs_item_size(&item));
-
- /* item4, give block 19 to the inode map */
- 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);
- btrfs_set_item_offset(&item, itemoff);
- btrfs_set_extent_owner(&extent_item, BTRFS_INODE_MAP_OBJECTID);
- 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);
- if (ret != blocksize)
- return -1;
-
- /* 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);
- btrfs_set_extent_owner(&extent_item, BTRFS_FS_TREE_OBJECTID);
- 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 + 2) * blocksize);
- if (ret != blocksize)
- return -1;
-
- /* create the inode map */
- btrfs_set_header_parentid(&empty_leaf->header,
- BTRFS_INODE_MAP_OBJECTID);
- btrfs_set_header_blocknr(&empty_leaf->header, start_block + 3);
- btrfs_set_header_nritems(&empty_leaf->header, 0);
- ret = pwrite(fd, empty_leaf, blocksize, (start_block + 3) * blocksize);
- if (ret != blocksize)
- 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, start_block + 4);
- btrfs_set_header_nritems(&empty_leaf->header, 0);
- ret = pwrite(fd, empty_leaf, blocksize, (start_block + 4) * blocksize);
- if (ret != blocksize)
- return -1;
- return 0;
-}
-
-u64 device_size(int fd, struct stat *st)
-{
- u64 size;
- if (S_ISREG(st->st_mode)) {
- return st->st_size;
- }
- if (!S_ISBLK(st->st_mode)) {
- return 0;
- }
- if (ioctl(fd, BLKGETSIZE64, &size) >= 0) {
- return size;
- }
- return 0;
-}
-
-int main(int ac, char **av)
-{
- char *file;
- u64 block_count = 0;
- int fd;
- struct stat st;
- int ret;
- int i;
- char *buf = malloc(4096);
- if (ac >= 2) {
- file = av[1];
- if (ac == 3) {
- block_count = atoi(av[2]);
- if (!block_count) {
- fprintf(stderr, "error finding block count\n");
- exit(1);
- }
- }
- } else {
- fprintf(stderr, "usage: mkfs.btrfs file [block count]\n");
- exit(1);
- }
- fd = open(file, O_RDWR);
- if (fd < 0) {
- fprintf(stderr, "unable to open %s\n", file);
- exit(1);
- }
- ret = fstat(fd, &st);
- if (ret < 0) {
- fprintf(stderr, "unable to stat %s\n", file);
- exit(1);
- }
- if (block_count == 0) {
- block_count = device_size(fd, &st);
- if (block_count == 0) {
- fprintf(stderr, "unable to find %s size\n", file);
- exit(1);
- }
- }
- block_count /= 4096;
- if (block_count < 256) {
- fprintf(stderr, "device %s is too small\n", file);
- exit(1);
- }
- memset(buf, 0, 4096);
- for(i = 0; i < 6; 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);
- if (ret) {
- fprintf(stderr, "error during mkfs %d\n", ret);
- exit(1);
- }
- printf("fs created on %s blocksize %d blocks %Lu\n",
- file, 4096, block_count);
- return 0;
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-18 20:12:17 +0000