Theodore Ts'o | c6bd0c9 | 2000-08-14 20:37:09 +0000 | [diff] [blame] | 1 | /* |
| 2 | * setsuper.c --- set a superblock value |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <unistd.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <ctype.h> |
| 9 | #include <string.h> |
| 10 | #include <time.h> |
| 11 | #include <sys/types.h> |
| 12 | #include <sys/stat.h> |
| 13 | #ifdef HAVE_ERRNO_H |
| 14 | #include <errno.h> |
| 15 | #endif |
| 16 | #include <fcntl.h> |
| 17 | #include <utime.h> |
| 18 | |
| 19 | #include "debugfs.h" |
| 20 | |
| 21 | static struct ext2_super_block set_sb; |
| 22 | |
| 23 | struct super_set_info { |
| 24 | char *name; |
| 25 | void *ptr; |
| 26 | int size; |
| 27 | errcode_t (*func)(struct super_set_info *info, char *arg); |
| 28 | }; |
| 29 | |
| 30 | static errcode_t parse_uint(struct super_set_info *info, char *arg); |
| 31 | static errcode_t parse_int(struct super_set_info *info, char *arg); |
| 32 | static errcode_t parse_string(struct super_set_info *info, char *arg); |
| 33 | |
| 34 | static struct super_set_info super_fields[] = { |
| 35 | { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, |
| 36 | { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint }, |
| 37 | { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint }, |
| 38 | { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint }, |
| 39 | { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint }, |
| 40 | { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint }, |
| 41 | { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint }, |
| 42 | { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int }, |
| 43 | { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint }, |
| 44 | { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint }, |
| 45 | { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint }, |
| 46 | /* s_mtime (time_t) */ |
| 47 | /* s_wtime (time_t) */ |
| 48 | { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint }, |
| 49 | { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int }, |
| 50 | /* s_magic */ |
| 51 | { "state", &set_sb.s_state, 2, parse_uint }, |
| 52 | { "errors", &set_sb.s_errors, 2, parse_uint }, |
| 53 | { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint }, |
| 54 | /* s_lastcheck (time_t) */ |
| 55 | { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint }, |
| 56 | { "creator_os", &set_sb.s_creator_os, 4, parse_uint }, |
| 57 | { "rev_level", &set_sb.s_rev_level, 4, parse_uint }, |
| 58 | { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint }, |
| 59 | { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint }, |
| 60 | { "first_ino", &set_sb.s_first_ino, 4, parse_uint }, |
| 61 | { "s_inode_size", &set_sb. s_inode_size, 2, parse_uint }, |
| 62 | { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint }, |
| 63 | { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint }, |
| 64 | { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint }, |
| 65 | { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint }, |
| 66 | /* __u8 s_uuid[16]; */ |
| 67 | { "volume_name", &set_sb.s_volume_name, 16, parse_string }, |
| 68 | { "last_mounted", &set_sb.s_last_mounted, 64, parse_string }, |
| 69 | { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, |
| 70 | 4, parse_uint }, |
| 71 | { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint }, |
| 72 | { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1, |
| 73 | parse_uint }, |
| 74 | /* s_padding1 */ |
| 75 | /* s_journal_uuid */ |
| 76 | { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint }, |
| 77 | { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint }, |
| 78 | { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint }, |
| 79 | |
| 80 | { 0, 0, 0, 0 } |
| 81 | }; |
| 82 | |
| 83 | static struct super_set_info *find_field(char *field) |
| 84 | { |
| 85 | struct super_set_info *ss; |
| 86 | |
| 87 | for (ss = super_fields ; ss->name ; ss++) { |
| 88 | if (strcmp(ss->name, field) == 0) |
| 89 | return ss; |
| 90 | } |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | static errcode_t parse_uint(struct super_set_info *info, char *arg) |
| 95 | { |
| 96 | unsigned long num; |
| 97 | char *tmp; |
| 98 | __u32 *ptr32; |
| 99 | __u16 *ptr16; |
| 100 | __u8 *ptr8; |
| 101 | |
| 102 | num = strtoul(arg, &tmp, 0); |
| 103 | if (*tmp) { |
| 104 | fprintf(stderr, "Couldn't parse '%s' for field %s.\n", |
| 105 | arg, info->name); |
| 106 | return EINVAL; |
| 107 | } |
| 108 | switch (info->size) { |
| 109 | case 4: |
| 110 | ptr32 = (__u32 *) info->ptr; |
| 111 | *ptr32 = num; |
| 112 | break; |
| 113 | case 2: |
| 114 | ptr16 = (__u16 *) info->ptr; |
| 115 | *ptr16 = num; |
| 116 | break; |
| 117 | case 1: |
| 118 | ptr8 = (__u8 *) info->ptr; |
| 119 | *ptr8 = num; |
| 120 | break; |
| 121 | } |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | static errcode_t parse_int(struct super_set_info *info, char *arg) |
| 126 | { |
| 127 | long num; |
| 128 | char *tmp; |
| 129 | __s32 *ptr32; |
| 130 | __s16 *ptr16; |
| 131 | __s8 *ptr8; |
| 132 | |
| 133 | num = strtol(arg, &tmp, 0); |
| 134 | if (*tmp) { |
| 135 | fprintf(stderr, "Couldn't parse '%s' for field %s.\n", |
| 136 | arg, info->name); |
| 137 | return EINVAL; |
| 138 | } |
| 139 | switch (info->size) { |
| 140 | case 4: |
| 141 | ptr32 = (__s32 *) info->ptr; |
| 142 | *ptr32 = num; |
| 143 | break; |
| 144 | case 2: |
| 145 | ptr16 = (__s16 *) info->ptr; |
| 146 | *ptr16 = num; |
| 147 | break; |
| 148 | case 1: |
| 149 | ptr8 = (__s8 *) info->ptr; |
| 150 | *ptr8 = num; |
| 151 | break; |
| 152 | } |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | static errcode_t parse_string(struct super_set_info *info, char *arg) |
| 157 | { |
| 158 | char *cp = (char *) info->ptr; |
| 159 | |
| 160 | if (strlen(arg) >= info->size) { |
| 161 | fprintf(stderr, "Error maximum size for %s is %d.\n", |
| 162 | info->name, info->size); |
| 163 | return EINVAL; |
| 164 | } |
| 165 | strcpy(cp, arg); |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | void do_set_super(int argc, char *argv[]) |
| 170 | { |
| 171 | char *cp; |
| 172 | ino_t parent; |
| 173 | char *name; |
| 174 | errcode_t retval; |
| 175 | static struct super_set_info *ss; |
| 176 | |
| 177 | if (check_fs_open(argv[0])) |
| 178 | return; |
| 179 | |
| 180 | if (argc != 3) { |
| 181 | com_err(argv[0], 0, "Usage: set_super <field> <value>"); |
| 182 | return; |
| 183 | } |
| 184 | |
| 185 | if (check_fs_read_write(argv[0])) |
| 186 | return; |
| 187 | |
| 188 | if ((ss = find_field(argv[1])) == 0) { |
| 189 | com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); |
| 190 | return; |
| 191 | } |
| 192 | set_sb = *current_fs->super; |
| 193 | if (ss->func(ss, argv[2]) == 0) { |
| 194 | *current_fs->super = set_sb; |
| 195 | ext2fs_mark_super_dirty(current_fs); |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | |
| 200 | |
| 201 | |