/
vbfs_format.c
602 lines (486 loc) · 14.1 KB
/
vbfs_format.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <uuid/uuid.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <assert.h>
#include "vbfs_format.h"
#ifndef CHAR_BIT
#define CHAR_BIT 8
#endif
struct vbfs_paramters vbfs_params;
struct vbfs_superblock vbfs_superblk;
static void vbfs_init_paramters()
{
vbfs_params.extend_size_kb = 0;
vbfs_params.dev_name = NULL;
vbfs_params.total_size = 0;
vbfs_params.file_idx_len = 256;
vbfs_params.bad_ratio = 2048;
vbfs_params.fd = -1;
}
static void cmd_usage()
{
fprintf(stderr, "Usage: mkfs_vbfs [options] device\n");
fprintf(stderr, "[options]\n");
fprintf(stderr, "-e assign extend size in KB\n");
fprintf(stderr, "-b assign bad ratio of extend nums\n");
fprintf(stderr, "\t\tdefaut 1:2048\n");
fprintf(stderr, "-x assign file index size of first extend in KB\n");
fprintf(stderr, "\t\tdefaut 256KB\n");
exit(1);
}
static int is_raid5_friendly()
{
int fd;
char name[8], buf[32], attr[128];
int chunk_size, raid_disks, stripe_size_kb;
name[7] = 0;
buf[31] = 0;
/* Fix */
strncpy(name, vbfs_params.dev_name + 5, sizeof(name) - 1);
if (0 == strncmp(name, "md", 2)) {
snprintf(attr, sizeof(attr), "/sys/block/%s/md/chunk_size", name);
fd = open(attr, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "open %s failed\n", attr);
return 1;
}
read(fd, buf, sizeof(buf) - 1);
chunk_size = atoi(buf);
snprintf(attr, sizeof(attr), "/sys/block/%s/md/raid_disks", name);
fd = open(attr, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "open %s failed\n", attr);
return 1;
}
read(fd, buf, sizeof(buf) - 1);
raid_disks = atoi(buf);
stripe_size_kb = (raid_disks - 1) * chunk_size / 1024;
if (vbfs_params.extend_size_kb == stripe_size_kb) {
return 0;
} else {
return 1;
}
}
return 0;
}
static int get_device_info()
{
int fd = 0;
struct stat stat_buf;
fd = open(vbfs_params.dev_name, O_RDWR|O_LARGEFILE);
if (fd < 0) {
fprintf(stderr, "Can't open %s\n", vbfs_params.dev_name);
return -1;
}
vbfs_params.fd = fd;
if (fstat(fd, &stat_buf) < 0) {
fprintf(stderr, "Can't get %s stat\n", vbfs_params.dev_name);
return -1;
}
if (S_ISREG(stat_buf.st_mode)) {
vbfs_params.total_size = stat_buf.st_size;
} else if (S_ISBLK(stat_buf.st_mode)) {
if (ioctl(fd, BLKGETSIZE64, &vbfs_params.total_size) < 0) {
fprintf(stderr, "Can't get disk size\n");
}
if (0 != is_raid5_friendly()) {
fprintf(stderr, "extend size is not a full stripe size\n");
}
} else {
fprintf(stderr, "%s is not a block device\n", vbfs_params.dev_name);
return -1;
}
return 0;
}
static void parse_options(int argc, char **argv)
{
static const char *option_string = "e:b:x";
int option = 0;
while ((option = getopt(argc, argv, option_string)) != EOF) {
switch (option) {
case 'e':
vbfs_params.extend_size_kb = atoi(optarg);
break;
case 'b':
vbfs_params.bad_ratio = atoi(optarg);
break;
case 'x':
vbfs_params.file_idx_len = atoi(optarg);
break;
default:
fprintf(stderr, "Unknown option %c\n", option);
cmd_usage();
break;
}
}
/* check paramters */
if (vbfs_params.extend_size_kb < 64) {
fprintf(stderr, "extend size must bigger than 64KB\n");
cmd_usage();
}
if (vbfs_params.extend_size_kb > 8192) {
fprintf(stderr, "\nWARN: extend size exceeds 8M\n\n");
}
if (vbfs_params.file_idx_len > vbfs_params.extend_size_kb) {
fprintf(stderr, "file index of first extend is too large\n");
cmd_usage();
}
if ((optind + 1) != argc) {
cmd_usage();
}
vbfs_params.dev_name = argv[optind];
}
__u32 calc_div(__u32 dividend, __u32 divisor)
{
__u32 result = 0;
if (dividend % divisor) {
result = dividend / divisor + 1;
} else {
result = dividend / divisor;
}
return result;
}
static void set_first_bits(char *bitmap, __u32 bit_num)
{
__u32 *bm = 0;
__u32 val = 0;
__u32 i;
bm = (__u32 *) bitmap;
val = le32_to_cpu(*bm);
for (i = 0; i < bit_num; i++)
val |= 1 << i;
*bm = cpu_to_le32(val);
}
static int vbfs_prepare_superblock()
{
__u32 extend_size = 0;
__u64 disk_size = 0;
__u32 extend_count = 0;
__u32 bad_max_count = 0;
__u32 bad_extend_count = 0;
__u32 bm_capacity = 0;
__u32 bitmap_cnt = 0;
extend_size = vbfs_params.extend_size_kb * 1024;
disk_size = vbfs_params.total_size;
printf("disk size %llu, extend size %u\n", disk_size, extend_size);
/* extend_count */
extend_count = disk_size / extend_size;
printf("extend count %u\n", extend_count);
/* bad extend (record bad extend number)*/
bad_max_count = calc_div(extend_count, vbfs_params.bad_ratio);
bad_extend_count = calc_div(bad_max_count, extend_size / 8);
printf("bad use %u extends\n", bad_extend_count);
/* bitmap */
bm_capacity = (extend_size - BITMAP_META_SIZE) * 8;
bitmap_cnt = calc_div(extend_count, bm_capacity);
memset(&vbfs_superblk, 0, sizeof(vbfs_superblk));
/*
* generate superblock
* */
vbfs_superblk.s_magic = VBFS_SUPER_MAGIC;
vbfs_superblk.s_extend_size = extend_size;
vbfs_superblk.s_extend_count = extend_count;
vbfs_superblk.s_file_idx_len = vbfs_params.file_idx_len * 1024;
/* bad extend */
vbfs_superblk.bad_count = 0;
vbfs_superblk.bad_extend_count = bad_extend_count;
vbfs_superblk.bad_extend_current = 0;
/* first extend is used by superblock*/
vbfs_superblk.bad_extend_offset = 1;
/* bitmap */
vbfs_superblk.bitmap_count = bitmap_cnt;
vbfs_superblk.bitmap_offset = bad_extend_count + 1;
vbfs_superblk.bitmap_current = 0;
vbfs_superblk.s_ctime = time(NULL);
vbfs_superblk.s_mount_time = 0;
/* 0 represent clean, 1 unclean */
vbfs_superblk.s_state = 0;
uuid_generate(vbfs_superblk.uuid);
return 0;
}
int write_to_disk(int fd, void *buf, __u64 offset, size_t len)
{
if (lseek64(fd, offset, SEEK_SET) < 0) {
fprintf(stderr, "lseek error %llu, %s\n", offset, strerror(errno));
return -1;
}
if (write(fd, buf, len) < 0) {
fprintf(stderr, "write error %s\n", strerror(errno));
return -1;
}
return 0;
}
static int write_extend(__u32 extend_no, void *buf)
{
size_t len = vbfs_params.extend_size_kb * 1024;
int fd = vbfs_params.fd;
off64_t offset = (__u64)extend_no * len;
if (write_to_disk(fd, buf, offset, len)) {
return -1;
}
return 0;
}
static int write_bad_extend()
{
int ret = 0;
char *extend = NULL;
int extend_size = 0;
int extend_no = 0;
int i;
extend_size = vbfs_params.extend_size_kb * 1024;
if ((extend = valloc(extend_size)) == NULL) {
fprintf(stderr, "No mem\n");
return -1;
}
extend_no = vbfs_superblk.bad_extend_offset;
memset(extend, 0, extend_size);
for (i = 0; i < vbfs_superblk.bad_extend_count; i ++) {
if (write_extend(extend_no, extend)) {
free(extend);
return -1;
}
extend_no ++;
}
free(extend);
return ret;
}
static void bitmap_header_to_disk(bitmap_header_dk_t *bm_header_dk, struct bitmap_header *bitmap)
{
bm_header_dk->bitmap_dk.group_no = cpu_to_le32(bitmap->group_no);
bm_header_dk->bitmap_dk.total_cnt = cpu_to_le32(bitmap->total_cnt);
bm_header_dk->bitmap_dk.free_cnt = cpu_to_le32(bitmap->free_cnt);
bm_header_dk->bitmap_dk.current_position = cpu_to_le32(bitmap->current_position);
}
static void bitmap_prepare(__u32 group_no, __u32 total_cnt, char *buf)
{
bitmap_header_dk_t bm_header_dk;
struct bitmap_header bm_header;
char *bitmap_region = NULL;
__u32 extend_size;
extend_size = vbfs_params.extend_size_kb * 1024;
memset(&bm_header_dk, 0, sizeof(bm_header_dk));
memset(buf, 0, extend_size);
bitmap_region = buf + BITMAP_META_SIZE;
bm_header.free_cnt = total_cnt;
bm_header.total_cnt = total_cnt;
bm_header.group_no = group_no;
bm_header.current_position = 0;
if (group_no == 0) {
bm_header.free_cnt --;
bm_header.current_position ++;
/* one bit for root dentry */
set_first_bits(bitmap_region, 1);
}
bitmap_header_to_disk(&bm_header_dk, &bm_header);
memcpy(buf, &bm_header_dk, sizeof(bm_header_dk));
}
static int write_bitmap()
{
char *buf = NULL;
int extend_size = 0;
int extend_no = 0;
__u32 i = 0;
__u32 count = 0;
__u32 one_bm_capacity = 0;
__u32 total_cnt = 0;
extend_size = vbfs_params.extend_size_kb * 1024;
/* minus 1 to backup superblock */
total_cnt = vbfs_superblk.s_extend_count
- vbfs_superblk.bitmap_count
- vbfs_superblk.bitmap_offset - 1;
one_bm_capacity = (extend_size - BITMAP_META_SIZE) * 8;
if ((buf = valloc(extend_size)) == NULL) {
fprintf(stderr, "No mem\n");
return -1;
}
extend_no = vbfs_superblk.bitmap_offset;
for (i = 0; i < vbfs_superblk.bitmap_count; i ++) {
if (total_cnt > one_bm_capacity * i) {
count = total_cnt - one_bm_capacity * i;
if (count > one_bm_capacity)
count = one_bm_capacity;
} else {
count = 0;
}
bitmap_prepare(i, count, buf);
if (write_extend(extend_no, buf)) {
free(buf);
return -1;
}
extend_no ++;
}
free(buf);
return 0;
}
static void save_dirent_header(vbfs_dir_header_dk_t *vbfs_header_dk,
struct vbfs_dirent_header *dir_header)
{
vbfs_header_dk->vbfs_dir_header.group_no = cpu_to_le32(dir_header->group_no);
vbfs_header_dk->vbfs_dir_header.total_extends = cpu_to_le32(dir_header->total_extends);
vbfs_header_dk->vbfs_dir_header.dir_self_count = cpu_to_le32(dir_header->dir_self_count);
vbfs_header_dk->vbfs_dir_header.dir_total_count = cpu_to_le32(dir_header->dir_total_count);
vbfs_header_dk->vbfs_dir_header.next_extend = cpu_to_le32(dir_header->next_extend);
vbfs_header_dk->vbfs_dir_header.dir_capacity = cpu_to_le32(dir_header->dir_capacity);
vbfs_header_dk->vbfs_dir_header.bitmap_size = cpu_to_le32(dir_header->bitmap_size);
}
static void save_dirent(struct vbfs_dirent_disk *dirent_dk, struct vbfs_dirent *dir)
{
dirent_dk->i_ino = cpu_to_le32(dir->i_ino);
dirent_dk->i_pino = cpu_to_le32(dir->i_pino);
dirent_dk->i_mode = cpu_to_le32(dir->i_mode);
dirent_dk->i_size = cpu_to_le64(dir->i_size);
dirent_dk->i_atime = cpu_to_le32(dir->i_atime);
dirent_dk->i_ctime = cpu_to_le32(dir->i_ctime);
dirent_dk->i_mtime = cpu_to_le32(dir->i_mtime);
dirent_dk->padding = cpu_to_le32(dir->padding);
memcpy(dir->name, dirent_dk->name, NAME_LEN);
}
static void prepare_root_dentry(char *buf)
{
int bitmap_size = 0;
int extend_size;
int dir_cnt = 0;
char *pos = NULL;
struct vbfs_dirent_header dir_header;
struct vbfs_dirent dirent;
extend_size = vbfs_params.extend_size_kb * 1024;
memset(buf, 0, extend_size);
memset(&dirent, 0, sizeof(dirent));
/* write dir header */
dir_cnt = (extend_size - VBFS_DIR_META_SIZE) / VBFS_DIR_SIZE;
dir_header.bitmap_size = calc_div(dir_cnt, VBFS_DIR_SIZE * CHAR_BIT);
dir_header.dir_capacity = dir_cnt - bitmap_size;
dir_header.group_no = 0;
dir_header.total_extends = 0;
dir_header.dir_self_count = 1;
dir_header.dir_total_count = 1;
dir_header.next_extend = 0;
pos = buf;
save_dirent_header((vbfs_dir_header_dk_t *) pos, &dir_header);
/* write dir bitmap */
pos = buf + VBFS_DIR_META_SIZE;
set_first_bits(pos, 1);
/* write dir */
dirent.i_ino = ROOT_INO;
dirent.i_pino = ROOT_INO;
dirent.i_mode = VBFS_FT_DIR;
dirent.i_size = extend_size;
dirent.i_atime = time(NULL);
dirent.i_ctime = time(NULL);
dirent.i_mtime = time(NULL);
dirent.padding = 0;
memset(dirent.name, 0, NAME_LEN);
pos = buf + VBFS_DIR_META_SIZE + dir_header.bitmap_size * VBFS_DIR_SIZE;
save_dirent((struct vbfs_dirent_disk *) pos, &dirent);
}
static int write_root_dentry()
{
char *buf = NULL;
int extend_size = 0;
int extend_no = 0;
extend_size = vbfs_params.extend_size_kb * 1024;
if ((buf = valloc(extend_size)) == NULL) {
fprintf(stderr, "No mem\n");
return -1;
}
extend_no = vbfs_superblk.bitmap_offset + vbfs_superblk.bitmap_count;
printf("root dirent extend %u\n", extend_no);
prepare_root_dentry(buf);
if (write_extend(extend_no, buf)) {
free(buf);
return -1;
}
free(buf);
return 0;
}
static void superblk_to_disk(struct vbfs_superblock_disk *super_dk,
struct vbfs_superblock *super)
{
super_dk->s_magic = cpu_to_le32(super->s_magic);
super_dk->s_extend_size = cpu_to_le32(super->s_extend_size);
super_dk->s_extend_count= cpu_to_le32(super->s_extend_count);
super_dk->s_file_idx_len = cpu_to_le32(super->s_file_idx_len);
super_dk->bad_count = cpu_to_le32(super->bad_count);
super_dk->bad_extend_count = cpu_to_le32(super->bad_extend_count);
super_dk->bad_extend_current = cpu_to_le32(super->bad_extend_current);
super_dk->bad_extend_offset = cpu_to_le32(super->bad_extend_offset);
super_dk->bitmap_count = cpu_to_le32(super->bitmap_count);
super_dk->bitmap_offset = cpu_to_le32(super->bitmap_offset);
super_dk->bitmap_current = cpu_to_le32(super->bitmap_current);
super_dk->s_ctime = cpu_to_le32(super->s_ctime);
super_dk->s_mount_time = cpu_to_le32(super->s_mount_time);
super_dk->s_state = cpu_to_le32(super->s_state);
memcpy(super->uuid, super_dk->uuid, sizeof(super_dk->uuid));
}
static int write_superblock()
{
int ret = 0;
char *extend = NULL;
int extend_size = 0;
int extend_no = 0;
char *pos;
vbfs_superblock_dk_t super_disk;
memset(&super_disk, 0, sizeof(vbfs_superblock_dk_t));
extend_size = vbfs_params.extend_size_kb * 1024;
if ((extend = valloc(extend_size)) == NULL) {
fprintf(stderr, "No mem\n");
return -1;
}
memset(extend, 0, extend_size);
superblk_to_disk(&super_disk.vbfs_super, &vbfs_superblk);
pos = extend + VBFS_SUPER_OFFSET;
memcpy(pos, &super_disk, sizeof(vbfs_superblock_dk_t));
/* write superblock */
if (write_extend(extend_no, extend)) {
free(extend);
return -1;
}
/* write backup superblock */
extend_no = vbfs_superblk.s_extend_count - 1;
if (write_extend(extend_no, extend)) {
free(extend);
return -1;
}
free(extend);
return ret;
}
static int vbfs_format_device()
{
int ret = 0;
vbfs_prepare_superblock();
ret = write_root_dentry();
if (ret < 0)
return -1;
ret = write_bad_extend();
if (ret < 0)
return -1;
ret = write_bitmap();
if (ret < 0)
return -1;
ret = write_superblock();
if (ret < 0)
return -1;
fsync(vbfs_params.fd);
close(vbfs_params.fd);
return 0;
}
int main(int argc, char **argv)
{
vbfs_init_paramters();
parse_options(argc, argv);
if (get_device_info() < 0)
return -1;
if (vbfs_format_device() < 0)
return -1;
return 0;
}