1 /*
2 * set_fields.c --- set a superblock value
3 *
4 * Copyright (C) 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12 #define _XOPEN_SOURCE 600 /* for inclusion of strptime() and strtoull */
13
14 #ifdef HAVE_STRTOULL
15 #define STRTOULL strtoull
16 #else
17 #define STRTOULL strtoul
18 #endif
19
20 #include <stdio.h>
21 #include <unistd.h>
22 #include <stdlib.h>
23 #include <ctype.h>
24 #include <string.h>
25 #include <strings.h>
26 #include <time.h>
27 #include <sys/types.h>
28 #include <sys/stat.h>
29 #ifdef HAVE_ERRNO_H
30 #include <errno.h>
31 #endif
32 #if HAVE_STRINGS_H
33 #include <strings.h>
34 #endif
35 #include <fcntl.h>
36 #include <utime.h>
37
38 #include "debugfs.h"
39 #include "uuid/uuid.h"
40 #include "e2p/e2p.h"
41
42 static struct ext2_super_block set_sb;
43 static struct ext2_inode set_inode;
44 static struct ext2_group_desc set_gd;
45 static dgrp_t set_bg;
46 static ext2_ino_t set_ino;
47 static int array_idx;
48
49 #define FLAG_ARRAY 0x0001
50
51 struct field_set_info {
52 const char *name;
53 void *ptr;
54 unsigned int size;
55 errcode_t (*func)(struct field_set_info *info, char *arg);
56 int flags;
57 int max_idx;
58 };
59
60 static errcode_t parse_uint(struct field_set_info *info, char *arg);
61 static errcode_t parse_int(struct field_set_info *info, char *arg);
62 static errcode_t parse_string(struct field_set_info *info, char *arg);
63 static errcode_t parse_uuid(struct field_set_info *info, char *arg);
64 static errcode_t parse_hashalg(struct field_set_info *info, char *arg);
65 static errcode_t parse_time(struct field_set_info *info, char *arg);
66 static errcode_t parse_bmap(struct field_set_info *info, char *arg);
67 static errcode_t parse_gd_csum(struct field_set_info *info, char *arg);
68
69 static struct field_set_info super_fields[] = {
70 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
71 { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint },
72 { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint },
73 { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint },
74 { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint },
75 { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint },
76 { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint },
77 { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int },
78 { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint },
79 { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint },
80 { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint },
81 { "mtime", &set_sb.s_mtime, 4, parse_time },
82 { "wtime", &set_sb.s_wtime, 4, parse_time },
83 { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint },
84 { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int },
85 /* s_magic */
86 { "state", &set_sb.s_state, 2, parse_uint },
87 { "errors", &set_sb.s_errors, 2, parse_uint },
88 { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint },
89 { "lastcheck", &set_sb.s_lastcheck, 4, parse_time },
90 { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint },
91 { "creator_os", &set_sb.s_creator_os, 4, parse_uint },
92 { "rev_level", &set_sb.s_rev_level, 4, parse_uint },
93 { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint },
94 { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint },
95 { "first_ino", &set_sb.s_first_ino, 4, parse_uint },
96 { "inode_size", &set_sb.s_inode_size, 2, parse_uint },
97 { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint },
98 { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint },
99 { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint },
100 { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint },
101 { "uuid", &set_sb.s_uuid, 16, parse_uuid },
102 { "volume_name", &set_sb.s_volume_name, 16, parse_string },
103 { "last_mounted", &set_sb.s_last_mounted, 64, parse_string },
104 { "lastcheck", &set_sb.s_lastcheck, 4, parse_uint },
105 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap,
106 4, parse_uint },
107 { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
108 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
109 parse_uint },
110 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2,
111 parse_uint },
112 { "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid },
113 { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint },
114 { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint },
115 { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint },
116 { "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid },
117 { "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg },
118 { "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint },
119 { "desc_size", &set_sb.s_desc_size, 2, parse_uint },
120 { "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint },
121 { "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint },
122 { "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time },
123 { "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY,
124 17 },
125 { "blocks_count_hi", &set_sb.s_blocks_count_hi, 4, parse_uint },
126 { "r_blocks_count_hi", &set_sb.s_r_blocks_count_hi, 4, parse_uint },
127 { "min_extra_isize", &set_sb.s_min_extra_isize, 2, parse_uint },
128 { "want_extra_isize", &set_sb.s_want_extra_isize, 2, parse_uint },
129 { "flags", &set_sb.s_flags, 4, parse_uint },
130 { "raid_stride", &set_sb.s_raid_stride, 2, parse_uint },
131 { "min_extra_isize", &set_sb.s_min_extra_isize, 4, parse_uint },
132 { "mmp_interval", &set_sb.s_mmp_interval, 2, parse_uint },
133 { "mmp_block", &set_sb.s_mmp_block, 8, parse_uint },
134 { "raid_stripe_width", &set_sb.s_raid_stripe_width, 4, parse_uint },
135 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, 1, parse_uint },
136 { "kbytes_written", &set_sb.s_kbytes_written, 8, parse_uint },
137 { "snapshot_inum", &set_sb.s_snapshot_inum, 4, parse_uint },
138 { "snapshot_id", &set_sb.s_snapshot_id, 4, parse_uint },
139 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, 8,
140 parse_uint },
141 { "snapshot_list", &set_sb.s_snapshot_list, 4, parse_uint },
142 { "mount_opts", &set_sb.s_mount_opts, 64, parse_string },
143 { 0, 0, 0, 0 }
144 };
145
146 static struct field_set_info inode_fields[] = {
147 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
148 { "mode", &set_inode.i_mode, 2, parse_uint },
149 { "uid", &set_inode.i_uid, 2, parse_uint },
150 { "size", &set_inode.i_size, 4, parse_uint },
151 { "atime", &set_inode.i_atime, 4, parse_time },
152 { "ctime", &set_inode.i_ctime, 4, parse_time },
153 { "mtime", &set_inode.i_mtime, 4, parse_time },
154 { "dtime", &set_inode.i_dtime, 4, parse_time },
155 { "gid", &set_inode.i_gid, 2, parse_uint },
156 { "links_count", &set_inode.i_links_count, 2, parse_uint },
157 { "blocks", &set_inode.i_blocks, 4, parse_uint },
158 { "flags", &set_inode.i_flags, 4, parse_uint },
159 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint },
160 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
161 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY,
162 EXT2_NDIR_BLOCKS },
163 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
164 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
165 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
166 { "generation", &set_inode.i_generation, 4, parse_uint },
167 { "file_acl", &set_inode.i_file_acl, 4, parse_uint },
168 { "file_acl_high", &set_inode.osd2.linux2.l_i_file_acl_high, 2,
169 parse_uint },
170 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
171 { "size_high", &set_inode.i_size_high, 4, parse_uint },
172 { "faddr", &set_inode.i_faddr, 4, parse_uint },
173 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint },
174 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint },
175 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint },
176 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
177 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
178 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
179 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
180 { 0, 0, 0, 0 }
181 };
182
183 static struct field_set_info ext2_bg_fields[] = {
184 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint },
185 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint },
186 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint },
187 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint },
188 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
189 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
190 { "flags", &set_gd.bg_flags, 2, parse_uint },
191 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
192 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
193 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum },
194 { 0, 0, 0, 0 }
195 };
196
197
find_field(struct field_set_info * fields,char * field)198 static struct field_set_info *find_field(struct field_set_info *fields,
199 char *field)
200 {
201 struct field_set_info *ss;
202 const char *prefix;
203 char *arg, *delim, *idx, *tmp;
204 int prefix_len;
205
206 if (fields == super_fields)
207 prefix = "s_";
208 else if (fields == inode_fields)
209 prefix = "i_";
210 else
211 prefix = "bg_";
212 prefix_len = strlen(prefix);
213 if (strncmp(field, prefix, prefix_len) == 0)
214 field += prefix_len;
215
216 arg = malloc(strlen(field)+1);
217 if (!arg)
218 return NULL;
219 strcpy(arg, field);
220
221 idx = strchr(arg, '[');
222 if (idx) {
223 *idx++ = 0;
224 delim = idx + strlen(idx) - 1;
225 if (!*idx || *delim != ']')
226 idx = 0;
227 else
228 *delim = 0;
229 }
230 /*
231 * Can we parse the number?
232 */
233 if (idx) {
234 array_idx = strtol(idx, &tmp, 0);
235 if (*tmp)
236 idx = 0;
237 }
238
239 for (ss = fields ; ss->name ; ss++) {
240 if (ss->flags & FLAG_ARRAY) {
241 if (!idx || (strcmp(ss->name, arg) != 0))
242 continue;
243 if (ss->max_idx > 0 && array_idx >= ss->max_idx)
244 continue;
245 } else {
246 if (strcmp(ss->name, field) != 0)
247 continue;
248 }
249 free(arg);
250 return ss;
251 }
252 free(arg);
253 return NULL;
254 }
255
parse_uint(struct field_set_info * info,char * arg)256 static errcode_t parse_uint(struct field_set_info *info, char *arg)
257 {
258 unsigned long long num, limit;
259 char *tmp;
260 union {
261 __u64 *ptr64;
262 __u32 *ptr32;
263 __u16 *ptr16;
264 __u8 *ptr8;
265 } u;
266
267 u.ptr8 = (__u8 *) info->ptr;
268 if (info->flags & FLAG_ARRAY)
269 u.ptr8 += array_idx * info->size;
270
271 errno = 0;
272 num = STRTOULL(arg, &tmp, 0);
273 if (*tmp || errno) {
274 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
275 arg, info->name);
276 return EINVAL;
277 }
278 limit = ~0ULL >> ((8 - info->size) * 8);
279 if (num > limit) {
280 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
281 arg, info->name, limit);
282 return EINVAL;
283 }
284 switch (info->size) {
285 case 8:
286 *u.ptr64 = num;
287 break;
288 case 4:
289 *u.ptr32 = num;
290 break;
291 case 2:
292 *u.ptr16 = num;
293 break;
294 case 1:
295 *u.ptr8 = num;
296 break;
297 }
298 return 0;
299 }
300
parse_int(struct field_set_info * info,char * arg)301 static errcode_t parse_int(struct field_set_info *info, char *arg)
302 {
303 long num;
304 char *tmp;
305 __s32 *ptr32;
306 __s16 *ptr16;
307 __s8 *ptr8;
308
309 num = strtol(arg, &tmp, 0);
310 if (*tmp) {
311 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
312 arg, info->name);
313 return EINVAL;
314 }
315 switch (info->size) {
316 case 4:
317 ptr32 = (__s32 *) info->ptr;
318 *ptr32 = num;
319 break;
320 case 2:
321 ptr16 = (__s16 *) info->ptr;
322 *ptr16 = num;
323 break;
324 case 1:
325 ptr8 = (__s8 *) info->ptr;
326 *ptr8 = num;
327 break;
328 }
329 return 0;
330 }
331
parse_string(struct field_set_info * info,char * arg)332 static errcode_t parse_string(struct field_set_info *info, char *arg)
333 {
334 char *cp = (char *) info->ptr;
335
336 if (strlen(arg) >= info->size) {
337 fprintf(stderr, "Error maximum size for %s is %d.\n",
338 info->name, info->size);
339 return EINVAL;
340 }
341 strcpy(cp, arg);
342 return 0;
343 }
344
parse_time(struct field_set_info * info,char * arg)345 static errcode_t parse_time(struct field_set_info *info, char *arg)
346 {
347 time_t t;
348 __u32 *ptr32;
349
350 ptr32 = (__u32 *) info->ptr;
351
352 t = string_to_time(arg);
353
354 if (t == ((time_t) -1)) {
355 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
356 arg, info->name);
357 return EINVAL;
358 }
359 *ptr32 = t;
360 return 0;
361 }
362
parse_uuid(struct field_set_info * info,char * arg)363 static errcode_t parse_uuid(struct field_set_info *info, char *arg)
364 {
365 unsigned char * p = (unsigned char *) info->ptr;
366
367 if ((strcasecmp(arg, "null") == 0) ||
368 (strcasecmp(arg, "clear") == 0)) {
369 uuid_clear(p);
370 } else if (strcasecmp(arg, "time") == 0) {
371 uuid_generate_time(p);
372 } else if (strcasecmp(arg, "random") == 0) {
373 uuid_generate(p);
374 } else if (uuid_parse(arg, p)) {
375 fprintf(stderr, "Invalid UUID format: %s\n", arg);
376 return EINVAL;
377 }
378 return 0;
379 }
380
parse_hashalg(struct field_set_info * info,char * arg)381 static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
382 {
383 int hashv;
384 unsigned char *p = (unsigned char *) info->ptr;
385
386 hashv = e2p_string2hash(arg);
387 if (hashv < 0) {
388 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
389 return EINVAL;
390 }
391 *p = hashv;
392 return 0;
393 }
394
parse_bmap(struct field_set_info * info,char * arg)395 static errcode_t parse_bmap(struct field_set_info *info, char *arg)
396 {
397 unsigned long num;
398 blk_t blk;
399 errcode_t retval;
400 char *tmp;
401
402 num = strtoul(arg, &tmp, 0);
403 if (*tmp) {
404 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
405 arg, info->name);
406 return EINVAL;
407 }
408 blk = num;
409
410 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET,
411 array_idx, &blk);
412 if (retval) {
413 com_err("set_inode", retval, "while setting block map");
414 }
415 return retval;
416 }
417
parse_gd_csum(struct field_set_info * info,char * arg)418 static errcode_t parse_gd_csum(struct field_set_info *info, char *arg)
419 {
420
421 if (strcmp(arg, "calc") == 0) {
422 ext2fs_group_desc_csum_set(current_fs, set_bg);
423 set_gd = current_fs->group_desc[set_bg];
424 printf("Checksum set to 0x%04x\n",
425 current_fs->group_desc[set_bg].bg_checksum);
426 return 0;
427 }
428
429 return parse_uint(info, arg);
430 }
431
print_possible_fields(struct field_set_info * fields)432 static void print_possible_fields(struct field_set_info *fields)
433 {
434 struct field_set_info *ss;
435 const char *type, *cmd;
436 FILE *f;
437 char name[40], idx[40];
438
439 if (fields == super_fields) {
440 type = "Superblock";
441 cmd = "set_super_value";
442 } else if (fields == inode_fields) {
443 type = "Inode";
444 cmd = "set_inode";
445 } else {
446 type = "Block group descriptor";
447 cmd = "set_block_group";
448 }
449 f = open_pager();
450
451 fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
452
453 for (ss = fields ; ss->name ; ss++) {
454 type = "unknown";
455 if (ss->func == parse_string)
456 type = "string";
457 else if (ss->func == parse_int)
458 type = "integer";
459 else if (ss->func == parse_uint)
460 type = "unsigned integer";
461 else if (ss->func == parse_uuid)
462 type = "UUID";
463 else if (ss->func == parse_hashalg)
464 type = "hash algorithm";
465 else if (ss->func == parse_time)
466 type = "date/time";
467 else if (ss->func == parse_bmap)
468 type = "set physical->logical block map";
469 strcpy(name, ss->name);
470 if (ss->flags & FLAG_ARRAY) {
471 if (ss->max_idx > 0)
472 sprintf(idx, "[%d]", ss->max_idx);
473 else
474 strcpy(idx, "[]");
475 strcat(name, idx);
476 }
477 fprintf(f, "\t%-20s\t%s\n", name, type);
478 }
479 close_pager(f);
480 }
481
482
do_set_super(int argc,char * argv[])483 void do_set_super(int argc, char *argv[])
484 {
485 const char *usage = "<field> <value>\n"
486 "\t\"set_super_value -l\" will list the names of "
487 "superblock fields\n\twhich can be set.";
488 static struct field_set_info *ss;
489
490 if ((argc == 2) && !strcmp(argv[1], "-l")) {
491 print_possible_fields(super_fields);
492 return;
493 }
494
495 if (common_args_process(argc, argv, 3, 3, "set_super_value",
496 usage, CHECK_FS_RW))
497 return;
498
499 if ((ss = find_field(super_fields, argv[1])) == 0) {
500 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
501 return;
502 }
503 set_sb = *current_fs->super;
504 if (ss->func(ss, argv[2]) == 0) {
505 *current_fs->super = set_sb;
506 ext2fs_mark_super_dirty(current_fs);
507 }
508 }
509
do_set_inode(int argc,char * argv[])510 void do_set_inode(int argc, char *argv[])
511 {
512 const char *usage = "<inode> <field> <value>\n"
513 "\t\"set_inode_field -l\" will list the names of "
514 "the fields in an ext2 inode\n\twhich can be set.";
515 static struct field_set_info *ss;
516
517 if ((argc == 2) && !strcmp(argv[1], "-l")) {
518 print_possible_fields(inode_fields);
519 return;
520 }
521
522 if (common_args_process(argc, argv, 4, 4, "set_inode",
523 usage, CHECK_FS_RW))
524 return;
525
526 if ((ss = find_field(inode_fields, argv[2])) == 0) {
527 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
528 return;
529 }
530
531 set_ino = string_to_inode(argv[1]);
532 if (!set_ino)
533 return;
534
535 if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
536 return;
537
538 if (ss->func(ss, argv[3]) == 0) {
539 if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
540 return;
541 }
542 }
543
do_set_block_group_descriptor(int argc,char * argv[])544 void do_set_block_group_descriptor(int argc, char *argv[])
545 {
546 const char *usage = "<bg number> <field> <value>\n"
547 "\t\"set_block_group_descriptor -l\" will list the names of "
548 "the fields in a block group descriptor\n\twhich can be set.";
549 struct field_set_info *ss;
550 char *end;
551
552 if ((argc == 2) && !strcmp(argv[1], "-l")) {
553 print_possible_fields(ext2_bg_fields);
554 return;
555 }
556
557 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
558 usage, CHECK_FS_RW))
559 return;
560
561 set_bg = strtoul(argv[1], &end, 0);
562 if (*end) {
563 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
564 return;
565 }
566
567 if (set_bg >= current_fs->group_desc_count) {
568 com_err(argv[0], 0, "block group number too big: %d", set_bg);
569 return;
570 }
571
572
573 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) {
574 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
575 return;
576 }
577
578 set_gd = current_fs->group_desc[set_bg];
579
580 if (ss->func(ss, argv[3]) == 0) {
581 current_fs->group_desc[set_bg] = set_gd;
582 ext2fs_mark_super_dirty(current_fs);
583 }
584 }
585