2 * setsuper.c --- set a superblock value
11 #include <sys/types.h>
21 static struct ext2_super_block set_sb;
23 struct super_set_info {
27 errcode_t (*func)(struct super_set_info *info, char *arg);
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);
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 },
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 { "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,
71 { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
72 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
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 },
83 static struct super_set_info *find_field(char *field)
85 struct super_set_info *ss;
87 if (strncmp(field, "s_", 2) == 0)
89 for (ss = super_fields ; ss->name ; ss++) {
90 if (strcmp(ss->name, field) == 0)
96 static errcode_t parse_uint(struct super_set_info *info, char *arg)
104 num = strtoul(arg, &tmp, 0);
106 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
110 switch (info->size) {
112 ptr32 = (__u32 *) info->ptr;
116 ptr16 = (__u16 *) info->ptr;
120 ptr8 = (__u8 *) info->ptr;
127 static errcode_t parse_int(struct super_set_info *info, char *arg)
135 num = strtol(arg, &tmp, 0);
137 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
141 switch (info->size) {
143 ptr32 = (__s32 *) info->ptr;
147 ptr16 = (__s16 *) info->ptr;
151 ptr8 = (__s8 *) info->ptr;
158 static errcode_t parse_string(struct super_set_info *info, char *arg)
160 char *cp = (char *) info->ptr;
162 if (strlen(arg) >= info->size) {
163 fprintf(stderr, "Error maximum size for %s is %d.\n",
164 info->name, info->size);
171 void do_set_super(int argc, char *argv[])
173 static struct super_set_info *ss;
175 if (check_fs_open(argv[0]))
179 com_err(argv[0], 0, "Usage: set_super <field> <value>");
183 if (check_fs_read_write(argv[0]))
186 if ((ss = find_field(argv[1])) == 0) {
187 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
190 set_sb = *current_fs->super;
191 if (ss->func(ss, argv[2]) == 0) {
192 *current_fs->super = set_sb;
193 ext2fs_mark_super_dirty(current_fs);