| /* |
| * 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 { |
| 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 }, |
| { "s_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 }, |
| { "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; |
| |
| 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; |
| } |
| |
| void do_set_super(int argc, char *argv[]) |
| { |
| char *cp; |
| ino_t parent; |
| char *name; |
| errcode_t retval; |
| static struct super_set_info *ss; |
| |
| if (check_fs_open(argv[0])) |
| return; |
| |
| if (argc != 3) { |
| com_err(argv[0], 0, "Usage: set_super <field> <value>"); |
| 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); |
| } |
| } |
| |
| |
| |
| |