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/*
* setsuper.c --- set a superblock value
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include <fcntl.h>
#include <utime.h>
#include "debugfs.h"
static struct ext2_super_block set_sb;
struct super_set_info {
const char *name;
void *ptr;
int size;
errcode_t (*func)(struct super_set_info *info, char *arg);
};
static errcode_t parse_uint(struct super_set_info *info, char *arg);
static errcode_t parse_int(struct super_set_info *info, char *arg);
static errcode_t parse_string(struct super_set_info *info, char *arg);
static struct super_set_info super_fields[] = {
{ "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
{ "blocks_count", &set_sb.s_blocks_count, 4, parse_uint },
{ "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint },
{ "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint },
{ "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint },
{ "first_data_block", &set_sb.s_first_data_block, 4, parse_uint },
{ "log_block_size", &set_sb.s_log_block_size, 4, parse_uint },
{ "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int },
{ "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint },
{ "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint },
{ "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint },
/* s_mtime (time_t) */
/* s_wtime (time_t) */
{ "mnt_count", &set_sb.s_mnt_count, 2, parse_uint },
{ "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int },
/* s_magic */
{ "state", &set_sb.s_state, 2, parse_uint },
{ "errors", &set_sb.s_errors, 2, parse_uint },
{ "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint },
/* s_lastcheck (time_t) */
{ "checkinterval", &set_sb.s_checkinterval, 4, parse_uint },
{ "creator_os", &set_sb.s_creator_os, 4, parse_uint },
{ "rev_level", &set_sb.s_rev_level, 4, parse_uint },
{ "def_resuid", &set_sb.s_def_resuid, 2, parse_uint },
{ "def_resgid", &set_sb.s_def_resgid, 2, parse_uint },
{ "first_ino", &set_sb.s_first_ino, 4, parse_uint },
{ "inode_size", &set_sb.s_inode_size, 2, parse_uint },
{ "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint },
{ "feature_compat", &set_sb.s_feature_compat, 4, parse_uint },
{ "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint },
{ "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint },
/* __u8 s_uuid[16]; */
{ "volume_name", &set_sb.s_volume_name, 16, parse_string },
{ "last_mounted", &set_sb.s_last_mounted, 64, parse_string },
{ "lastcheck", &set_sb.s_lastcheck, 4, parse_uint },
{ "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap,
4, parse_uint },
{ "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
{ "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
parse_uint },
/* s_padding1 */
/* s_journal_uuid */
{ "journal_inum", &set_sb.s_journal_inum, 4, parse_uint },
{ "journal_dev", &set_sb.s_journal_dev, 4, parse_uint },
{ "last_orphan", &set_sb.s_last_orphan, 4, parse_uint },
{ 0, 0, 0, 0 }
};
static struct super_set_info *find_field(char *field)
{
struct super_set_info *ss;
if (strncmp(field, "s_", 2) == 0)
field += 2;
for (ss = super_fields ; ss->name ; ss++) {
if (strcmp(ss->name, field) == 0)
return ss;
}
return NULL;
}
static errcode_t parse_uint(struct super_set_info *info, char *arg)
{
unsigned long num;
char *tmp;
__u32 *ptr32;
__u16 *ptr16;
__u8 *ptr8;
num = strtoul(arg, &tmp, 0);
if (*tmp) {
fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
arg, info->name);
return EINVAL;
}
switch (info->size) {
case 4:
ptr32 = (__u32 *) info->ptr;
*ptr32 = num;
break;
case 2:
ptr16 = (__u16 *) info->ptr;
*ptr16 = num;
break;
case 1:
ptr8 = (__u8 *) info->ptr;
*ptr8 = num;
break;
}
return 0;
}
static errcode_t parse_int(struct super_set_info *info, char *arg)
{
long num;
char *tmp;
__s32 *ptr32;
__s16 *ptr16;
__s8 *ptr8;
num = strtol(arg, &tmp, 0);
if (*tmp) {
fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
arg, info->name);
return EINVAL;
}
switch (info->size) {
case 4:
ptr32 = (__s32 *) info->ptr;
*ptr32 = num;
break;
case 2:
ptr16 = (__s16 *) info->ptr;
*ptr16 = num;
break;
case 1:
ptr8 = (__s8 *) info->ptr;
*ptr8 = num;
break;
}
return 0;
}
static errcode_t parse_string(struct super_set_info *info, char *arg)
{
char *cp = (char *) info->ptr;
if (strlen(arg) >= info->size) {
fprintf(stderr, "Error maximum size for %s is %d.\n",
info->name, info->size);
return EINVAL;
}
strcpy(cp, arg);
return 0;
}
static void print_possible_fields()
{
struct super_set_info *ss;
char *type;
printf("Superblock fields supported by the set_super_value command:\n");
for (ss = super_fields ; ss->name ; ss++) {
type = "unknown";
if (ss->func == parse_string)
type = "string";
else if (ss->func == parse_int)
type = "integer";
else if (ss->func == parse_uint)
type = "unsigned integer";
printf("\t%-20s\t%s\n", ss->name, type);
}
}
void do_set_super(int argc, char *argv[])
{
const char *usage = "Usage: set_super <field> <value>\n"
"\t\"set_super -l\" will list the names of superblock fields "
"which\n\tcan be set.";
static struct super_set_info *ss;
if ((argc == 2) && !strcmp(argv[1], "-l")) {
print_possible_fields();
return;
}
if (check_fs_open(argv[0]))
return;
if (argc != 3) {
com_err(argv[0], 0, usage);
return;
}
if (check_fs_read_write(argv[0]))
return;
if ((ss = find_field(argv[1])) == 0) {
com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
return;
}
set_sb = *current_fs->super;
if (ss->func(ss, argv[2]) == 0) {
*current_fs->super = set_sb;
ext2fs_mark_super_dirty(current_fs);
}
}
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