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Commit | Line | Data |
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c6bd0c97 TT |
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" | |
3e699064 TT |
20 | #include "uuid/uuid.h" |
21 | #include "e2p/e2p.h" | |
c6bd0c97 TT |
22 | |
23 | static struct ext2_super_block set_sb; | |
24 | ||
25 | struct super_set_info { | |
b044c2e0 | 26 | const char *name; |
c6bd0c97 | 27 | void *ptr; |
54434927 | 28 | unsigned int size; |
c6bd0c97 TT |
29 | errcode_t (*func)(struct super_set_info *info, char *arg); |
30 | }; | |
31 | ||
32 | static errcode_t parse_uint(struct super_set_info *info, char *arg); | |
33 | static errcode_t parse_int(struct super_set_info *info, char *arg); | |
34 | static errcode_t parse_string(struct super_set_info *info, char *arg); | |
f61fc0b5 TT |
35 | static errcode_t parse_uuid(struct super_set_info *info, char *arg); |
36 | static errcode_t parse_hashalg(struct super_set_info *info, char *arg); | |
c6bd0c97 TT |
37 | |
38 | static struct super_set_info super_fields[] = { | |
39 | { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint }, | |
40 | { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint }, | |
41 | { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint }, | |
42 | { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint }, | |
43 | { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint }, | |
44 | { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint }, | |
45 | { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint }, | |
46 | { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int }, | |
47 | { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint }, | |
48 | { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint }, | |
49 | { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint }, | |
50 | /* s_mtime (time_t) */ | |
51 | /* s_wtime (time_t) */ | |
52 | { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint }, | |
53 | { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int }, | |
54 | /* s_magic */ | |
55 | { "state", &set_sb.s_state, 2, parse_uint }, | |
56 | { "errors", &set_sb.s_errors, 2, parse_uint }, | |
57 | { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint }, | |
58 | /* s_lastcheck (time_t) */ | |
59 | { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint }, | |
60 | { "creator_os", &set_sb.s_creator_os, 4, parse_uint }, | |
61 | { "rev_level", &set_sb.s_rev_level, 4, parse_uint }, | |
62 | { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint }, | |
63 | { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint }, | |
64 | { "first_ino", &set_sb.s_first_ino, 4, parse_uint }, | |
426d734f | 65 | { "inode_size", &set_sb.s_inode_size, 2, parse_uint }, |
c6bd0c97 TT |
66 | { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint }, |
67 | { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint }, | |
68 | { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint }, | |
69 | { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint }, | |
f61fc0b5 | 70 | { "uuid", &set_sb.s_uuid, 16, parse_uuid }, |
c6bd0c97 TT |
71 | { "volume_name", &set_sb.s_volume_name, 16, parse_string }, |
72 | { "last_mounted", &set_sb.s_last_mounted, 64, parse_string }, | |
364a373e | 73 | { "lastcheck", &set_sb.s_lastcheck, 4, parse_uint }, |
c6bd0c97 TT |
74 | { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, |
75 | 4, parse_uint }, | |
76 | { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint }, | |
77 | { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1, | |
78 | parse_uint }, | |
79 | /* s_padding1 */ | |
f61fc0b5 | 80 | { "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid }, |
c6bd0c97 TT |
81 | { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint }, |
82 | { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint }, | |
83 | { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint }, | |
f61fc0b5 TT |
84 | { "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid }, |
85 | { "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg }, | |
c6bd0c97 TT |
86 | { 0, 0, 0, 0 } |
87 | }; | |
88 | ||
89 | static struct super_set_info *find_field(char *field) | |
90 | { | |
91 | struct super_set_info *ss; | |
92 | ||
3db9305a TT |
93 | if (strncmp(field, "s_", 2) == 0) |
94 | field += 2; | |
c6bd0c97 TT |
95 | for (ss = super_fields ; ss->name ; ss++) { |
96 | if (strcmp(ss->name, field) == 0) | |
97 | return ss; | |
98 | } | |
99 | return NULL; | |
100 | } | |
101 | ||
102 | static errcode_t parse_uint(struct super_set_info *info, char *arg) | |
103 | { | |
104 | unsigned long num; | |
105 | char *tmp; | |
106 | __u32 *ptr32; | |
107 | __u16 *ptr16; | |
108 | __u8 *ptr8; | |
109 | ||
110 | num = strtoul(arg, &tmp, 0); | |
111 | if (*tmp) { | |
112 | fprintf(stderr, "Couldn't parse '%s' for field %s.\n", | |
113 | arg, info->name); | |
114 | return EINVAL; | |
115 | } | |
116 | switch (info->size) { | |
117 | case 4: | |
118 | ptr32 = (__u32 *) info->ptr; | |
119 | *ptr32 = num; | |
120 | break; | |
121 | case 2: | |
122 | ptr16 = (__u16 *) info->ptr; | |
123 | *ptr16 = num; | |
124 | break; | |
125 | case 1: | |
126 | ptr8 = (__u8 *) info->ptr; | |
127 | *ptr8 = num; | |
128 | break; | |
129 | } | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static errcode_t parse_int(struct super_set_info *info, char *arg) | |
134 | { | |
135 | long num; | |
136 | char *tmp; | |
137 | __s32 *ptr32; | |
138 | __s16 *ptr16; | |
139 | __s8 *ptr8; | |
140 | ||
141 | num = strtol(arg, &tmp, 0); | |
142 | if (*tmp) { | |
143 | fprintf(stderr, "Couldn't parse '%s' for field %s.\n", | |
144 | arg, info->name); | |
145 | return EINVAL; | |
146 | } | |
147 | switch (info->size) { | |
148 | case 4: | |
149 | ptr32 = (__s32 *) info->ptr; | |
150 | *ptr32 = num; | |
151 | break; | |
152 | case 2: | |
153 | ptr16 = (__s16 *) info->ptr; | |
154 | *ptr16 = num; | |
155 | break; | |
156 | case 1: | |
157 | ptr8 = (__s8 *) info->ptr; | |
158 | *ptr8 = num; | |
159 | break; | |
160 | } | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static errcode_t parse_string(struct super_set_info *info, char *arg) | |
165 | { | |
166 | char *cp = (char *) info->ptr; | |
167 | ||
168 | if (strlen(arg) >= info->size) { | |
169 | fprintf(stderr, "Error maximum size for %s is %d.\n", | |
170 | info->name, info->size); | |
171 | return EINVAL; | |
172 | } | |
173 | strcpy(cp, arg); | |
174 | return 0; | |
175 | } | |
176 | ||
f61fc0b5 TT |
177 | static errcode_t parse_uuid(struct super_set_info *info, char *arg) |
178 | { | |
3e699064 | 179 | unsigned char * p = (unsigned char *) info->ptr; |
f61fc0b5 TT |
180 | |
181 | if ((strcasecmp(arg, "null") == 0) || | |
182 | (strcasecmp(arg, "clear") == 0)) { | |
183 | uuid_clear(p); | |
184 | } else if (strcasecmp(arg, "time") == 0) { | |
185 | uuid_generate_time(p); | |
186 | } else if (strcasecmp(arg, "random") == 0) { | |
187 | uuid_generate(p); | |
188 | } else if (uuid_parse(arg, p)) { | |
189 | fprintf(stderr, "Invalid UUID format: %s\n", arg); | |
190 | return EINVAL; | |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static errcode_t parse_hashalg(struct super_set_info *info, char *arg) | |
196 | { | |
197 | int hashv; | |
198 | unsigned char *p = (unsigned char *) info->ptr; | |
199 | ||
200 | hashv = e2p_string2hash(arg); | |
201 | if (hashv < 0) { | |
202 | fprintf(stderr, "Invalid hash algorithm: %s\n", arg); | |
203 | return EINVAL; | |
204 | } | |
205 | *p = hashv; | |
206 | return 0; | |
207 | } | |
208 | ||
209 | ||
e1018eea | 210 | static void print_possible_fields(void) |
6e96adcb TT |
211 | { |
212 | struct super_set_info *ss; | |
4ea7bd04 | 213 | const char *type; |
6e96adcb TT |
214 | |
215 | printf("Superblock fields supported by the set_super_value command:\n"); | |
216 | for (ss = super_fields ; ss->name ; ss++) { | |
217 | type = "unknown"; | |
218 | if (ss->func == parse_string) | |
219 | type = "string"; | |
220 | else if (ss->func == parse_int) | |
221 | type = "integer"; | |
222 | else if (ss->func == parse_uint) | |
223 | type = "unsigned integer"; | |
f61fc0b5 TT |
224 | else if (ss->func == parse_uuid) |
225 | type = "UUID"; | |
226 | else if (ss->func == parse_hashalg) | |
227 | type = "hash algorithm"; | |
6e96adcb TT |
228 | printf("\t%-20s\t%s\n", ss->name, type); |
229 | } | |
230 | } | |
231 | ||
232 | ||
c6bd0c97 TT |
233 | void do_set_super(int argc, char *argv[]) |
234 | { | |
e1018eea TT |
235 | const char *usage = "<field> <value>\n" |
236 | "\t\"set_super_value -l\" will list the names of " | |
237 | "superblock fields\n\twhich can be set."; | |
c6bd0c97 TT |
238 | static struct super_set_info *ss; |
239 | ||
6e96adcb TT |
240 | if ((argc == 2) && !strcmp(argv[1], "-l")) { |
241 | print_possible_fields(); | |
242 | return; | |
243 | } | |
244 | ||
e1018eea TT |
245 | if (common_args_process(argc, argv, 3, 3, "set_super_value", |
246 | usage, CHECK_FS_RW)) | |
c6bd0c97 TT |
247 | return; |
248 | ||
c6bd0c97 TT |
249 | if ((ss = find_field(argv[1])) == 0) { |
250 | com_err(argv[0], 0, "invalid field specifier: %s", argv[1]); | |
251 | return; | |
252 | } | |
253 | set_sb = *current_fs->super; | |
254 | if (ss->func(ss, argv[2]) == 0) { | |
255 | *current_fs->super = set_sb; | |
256 | ext2fs_mark_super_dirty(current_fs); | |
257 | } | |
258 | } |