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mktest.c
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mktest.c
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/*
* file: mktest.c
* description: create test image for CS 5600 / 7600 homework 3
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <sys/select.h>
#include <time.h>
#include <unistd.h>
#include "fs7600.h"
char *disk;
fd_set *inode_map;
fd_set *block_map;
void *next_ptr;
int main(int argc, char **argv)
{
int i;
char *file = argv[1];
int n_blks = 1024;
int n_map_blks = 1;
int n_inos = 64;
int n_ino_blks = n_inos * sizeof(struct fs7600_inode) / FS_BLOCK_SIZE;
disk = malloc(n_blks * FS_BLOCK_SIZE);
memset(disk, 0, n_blks * FS_BLOCK_SIZE);
struct fs7600_super *sb = (void*)disk;
void *ptr = disk + FS_BLOCK_SIZE;
inode_map = ptr; ptr += FS_BLOCK_SIZE;
block_map = ptr; ptr += FS_BLOCK_SIZE;
*sb = (struct fs7600_super){.magic = FS7600_MAGIC, .inode_map_sz = 1,
.inode_region_sz = n_ino_blks, .block_map_sz = 1,
.num_blocks = n_blks, .root_inode = 1};
FD_SET(0, inode_map);
/* remember (from /usr/include/i386-linux-gnu/bits/stat.h)
* S_IFDIR = 0040000 - directory
* S_IFREG = 0100000 - regular file
*/
/* block 0 - superblock
* 1 - inode map
* 2 - block map
* 3,4,5,6 - inodes
* 7 - root directory (inode 1)
* [8 - file]
*/
struct fs7600_inode *inodes = ptr; ptr += 4*FS_BLOCK_SIZE;
/* root directory
*/
int inum = 1;
int root_inum = inum++;
FD_SET(root_inum, inode_map);
int root_blk = (ptr - (void*)disk) / FS_BLOCK_SIZE;
struct fs7600_dirent *root_de = ptr; ptr += FS_BLOCK_SIZE;
int t = 0x50000000;
inodes[root_inum] = (struct fs7600_inode){.uid = 1000, .gid = 1000, .mode = 0040777,
.ctime = t, .mtime = t,
.size = 1024,
.direct = {root_blk, 0, 0, 0, 0, 0},
.indir_1 = 0, .indir_2 = 0};
/* "/file.A", 1000 bytes, permission 777
*/
int f1_inode = inum++;
root_de[0] = (struct fs7600_dirent){.valid = 0, .isDir = 0,
.inode = 1717, .name = "file.A"};
root_de[1] = (struct fs7600_dirent){.valid = 1, .isDir = 0,
.inode = f1_inode, .name = "file.A"};
int f1_blk = (ptr - (void*)disk) / FS_BLOCK_SIZE;
void *f1_ptr = ptr; ptr += FS_BLOCK_SIZE;
memset(f1_ptr, 'A', 1000);
inodes[f1_inode] = (struct fs7600_inode){.uid = 1000, .gid = 1000, .mode = 0100777,
.ctime = t+200, .mtime = t+200,
.size = 1000,
.direct = {f1_blk, 0, 0, 0, 0, 0},
.indir_1 = 0, .indir_2 = 0};
/* "/dir1/", directory, permission 755
* note invalid directory entry for testing...
*/
int d1_inode = inum++;
root_de[3] = (struct fs7600_dirent){.valid = 0, .isDir = 1,
.inode = f1_inode, .name = "dir1"};
root_de[5] = (struct fs7600_dirent){.valid = 1, .isDir = 1,
.inode = d1_inode, .name = "dir1"};
int d1_blk = (ptr - (void*)disk) / FS_BLOCK_SIZE;
struct fs7600_dirent *d1_de = ptr; ptr += FS_BLOCK_SIZE;
inodes[d1_inode] = (struct fs7600_inode){.uid = 1000, .gid = 1000, .mode = 0040755,
.ctime = t+400, .mtime = t+400,
.size = 0,
.direct = {d1_blk, 0, 0, 0, 0, 0},
.indir_1 = 0, .indir_2 = 0};
/* "/dir1/file.2", file, 2012 bytes
*/
int f2_inode = inum++;
int f2_blk1 = (ptr - (void*)disk) / FS_BLOCK_SIZE;
void *f2_ptr = ptr; ptr += FS_BLOCK_SIZE;
int f2_blk2 = (ptr - (void*)disk) / FS_BLOCK_SIZE; ptr += FS_BLOCK_SIZE;
d1_de[3] = (struct fs7600_dirent){.valid = 1, .isDir = 0,
.inode = f2_inode, .name = "file.2"};
memset(f2_ptr, '2', 2 * FS_BLOCK_SIZE);
inodes[f2_inode] = (struct fs7600_inode){.uid = 1000, .gid = 1000, .mode = 0100777,
.ctime = t+200, .mtime = t+200,
.size = 2012,
.direct = {f2_blk2, f2_blk1, 0, 0, 0, 0},
.indir_1 = 0, .indir_2 = 0};
/* "/dir1/file.0", zero-length file
*/
int f3_inode = inum++;
d1_de[4] = (struct fs7600_dirent){.valid = 1, .isDir = 0,
.inode = f3_inode, .name = "file.0"};
inodes[f3_inode] = (struct fs7600_inode){.uid = 1000, .gid = 1000, .mode = 0100777,
.ctime = t+200, .mtime = t+200,
.size = 0,
.direct = {0, 0, 0, 0, 0, 0},
.indir_1 = 0, .indir_2 = 0};
/* "/file.7", 7KB file
*/
int f4_inode = inum++;
int f4_indirN = (ptr - (void*)disk) / FS_BLOCK_SIZE;
int *f4_indir = ptr; ptr += FS_BLOCK_SIZE;
int f4_blk0 = (ptr - (void*)disk) / FS_BLOCK_SIZE;
void *f4_data = ptr; ptr += 7*FS_BLOCK_SIZE;
root_de[6] = (struct fs7600_dirent){.valid = 1, .isDir = 0,
.inode = f4_inode, .name = "file.7"};
inodes[f4_inode] = (struct fs7600_inode){.uid = 1000, .gid = 1000, .mode = 0100777,
.ctime = t+300, .mtime = t+300,
.size = 6*1024 + 500,
.direct = {0, 0, 0, 0, 0, 0},
.indir_1 = f4_indirN, .indir_2 = 0};
for (i = 0; i < 6; i++)
inodes[f4_inode].direct[i] = f4_blk0++;
f4_indir[0] = f4_blk0;
memset(f4_data, '4', 6*1024+500);
/* "/dir1/file.270", 270KB file
*/
int f5_inode = inum++;
int f5_indN1 = (ptr - (void*)disk) / FS_BLOCK_SIZE;
int *f5_indir1 = ptr; ptr += FS_BLOCK_SIZE;
int f5_indN2 = (ptr - (void*)disk) / FS_BLOCK_SIZE;
int *f5_indir2 = ptr; ptr += FS_BLOCK_SIZE;
int f5_indN2_0 = (ptr - (void*)disk) / FS_BLOCK_SIZE;
int *f5_indir2_0 = ptr; ptr += FS_BLOCK_SIZE;
int f5_blk0 = (ptr - (void*)disk) / FS_BLOCK_SIZE;
void *f5_data = ptr; ptr += 270*FS_BLOCK_SIZE;
d1_de[6] = (struct fs7600_dirent){.valid = 1, .isDir = 0,
.inode = f5_inode, .name = "file.270"};
inodes[f5_inode] = (struct fs7600_inode){.uid = 1000, .gid = 1000, .mode = 0100777,
.ctime = t+300, .mtime = t+300,
.size = 269*1024 + 721,
.direct = {0, 0, 0, 0, 0, 0},
.indir_1 = 0, .indir_2 = 0};
for (i = 0; i < 6; i++)
inodes[f5_inode].direct[i] = f5_blk0++;
inodes[f5_inode].indir_1 = f5_indN1;
for (i = 0; i < 256; i++)
f5_indir1[i] = f5_blk0++;
/* 270 - 6 - 256 = 8
*/
inodes[f5_inode].indir_2 = f5_indN2;
f5_indir2[0] = f5_indN2_0;
for (i = 0; i < 8; i++)
f5_indir2_0[i] = f5_blk0++;
memset(f5_data, 'K', 269*1024+721);
for (i = 0; i < inum; i++)
FD_SET(i, inode_map);
for (i = 0; i < (ptr - (void*)disk)/FS_BLOCK_SIZE; i++)
FD_SET(i, block_map);
int fd = open(file, O_WRONLY|O_CREAT|O_TRUNC, 0777);
write(fd, disk, n_blks * FS_BLOCK_SIZE);
close(fd);
return 0;
}