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 { 0, 0, 0, 0 }
138 };
139
140 static struct field_set_info inode_fields[] = {
141 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
142 { "mode", &set_inode.i_mode, 2, parse_uint },
143 { "uid", &set_inode.i_uid, 2, parse_uint },
144 { "size", &set_inode.i_size, 4, parse_uint },
145 { "atime", &set_inode.i_atime, 4, parse_time },
146 { "ctime", &set_inode.i_ctime, 4, parse_time },
147 { "mtime", &set_inode.i_mtime, 4, parse_time },
148 { "dtime", &set_inode.i_dtime, 4, parse_time },
149 { "gid", &set_inode.i_gid, 2, parse_uint },
150 { "links_count", &set_inode.i_links_count, 2, parse_uint },
151 { "blocks", &set_inode.i_blocks, 4, parse_uint },
152 { "flags", &set_inode.i_flags, 4, parse_uint },
153 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint },
154 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
155 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY,
156 EXT2_NDIR_BLOCKS },
157 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
158 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
159 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
160 { "generation", &set_inode.i_generation, 4, parse_uint },
161 { "file_acl", &set_inode.i_file_acl, 4, parse_uint },
162 { "file_acl_high", &set_inode.osd2.linux2.l_i_file_acl_high, 2,
163 parse_uint },
164 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
165 { "size_high", &set_inode.i_size_high, 4, parse_uint },
166 { "faddr", &set_inode.i_faddr, 4, parse_uint },
167 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint },
168 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint },
169 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint },
170 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
171 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
172 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
173 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
174 { 0, 0, 0, 0 }
175 };
176
177 static struct field_set_info ext2_bg_fields[] = {
178 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint },
179 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint },
180 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint },
181 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint },
182 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
183 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
184 { "flags", &set_gd.bg_flags, 2, parse_uint },
185 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
186 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
187 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum },
188 { 0, 0, 0, 0 }
189 };
190
191
find_field(struct field_set_info * fields,char * field)192 static struct field_set_info *find_field(struct field_set_info *fields,
193 char *field)
194 {
195 struct field_set_info *ss;
196 const char *prefix;
197 char *arg, *delim, *idx, *tmp;
198 int prefix_len;
199
200 if (fields == super_fields)
201 prefix = "s_";
202 else if (fields == inode_fields)
203 prefix = "i_";
204 else
205 prefix = "bg_";
206 prefix_len = strlen(prefix);
207 if (strncmp(field, prefix, prefix_len) == 0)
208 field += prefix_len;
209
210 arg = malloc(strlen(field)+1);
211 if (!arg)
212 return NULL;
213 strcpy(arg, field);
214
215 idx = strchr(arg, '[');
216 if (idx) {
217 *idx++ = 0;
218 delim = idx + strlen(idx) - 1;
219 if (!*idx || *delim != ']')
220 idx = 0;
221 else
222 *delim = 0;
223 }
224 /*
225 * Can we parse the number?
226 */
227 if (idx) {
228 array_idx = strtol(idx, &tmp, 0);
229 if (*tmp)
230 idx = 0;
231 }
232
233 for (ss = fields ; ss->name ; ss++) {
234 if (ss->flags & FLAG_ARRAY) {
235 if (!idx || (strcmp(ss->name, arg) != 0))
236 continue;
237 if (ss->max_idx > 0 && array_idx >= ss->max_idx)
238 continue;
239 } else {
240 if (strcmp(ss->name, field) != 0)
241 continue;
242 }
243 free(arg);
244 return ss;
245 }
246 free(arg);
247 return NULL;
248 }
249
parse_uint(struct field_set_info * info,char * arg)250 static errcode_t parse_uint(struct field_set_info *info, char *arg)
251 {
252 unsigned long long num, limit;
253 char *tmp;
254 union {
255 __u64 *ptr64;
256 __u32 *ptr32;
257 __u16 *ptr16;
258 __u8 *ptr8;
259 } u;
260
261 u.ptr8 = (__u8 *) info->ptr;
262 if (info->flags & FLAG_ARRAY)
263 u.ptr8 += array_idx * info->size;
264
265 errno = 0;
266 num = STRTOULL(arg, &tmp, 0);
267 if (*tmp || errno) {
268 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
269 arg, info->name);
270 return EINVAL;
271 }
272 limit = ~0ULL >> ((8 - info->size) * 8);
273 if (num > limit) {
274 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
275 arg, info->name, limit);
276 return EINVAL;
277 }
278 switch (info->size) {
279 case 8:
280 *u.ptr64 = num;
281 break;
282 case 4:
283 *u.ptr32 = num;
284 break;
285 case 2:
286 *u.ptr16 = num;
287 break;
288 case 1:
289 *u.ptr8 = num;
290 break;
291 }
292 return 0;
293 }
294
parse_int(struct field_set_info * info,char * arg)295 static errcode_t parse_int(struct field_set_info *info, char *arg)
296 {
297 long num;
298 char *tmp;
299 __s32 *ptr32;
300 __s16 *ptr16;
301 __s8 *ptr8;
302
303 num = strtol(arg, &tmp, 0);
304 if (*tmp) {
305 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
306 arg, info->name);
307 return EINVAL;
308 }
309 switch (info->size) {
310 case 4:
311 ptr32 = (__s32 *) info->ptr;
312 *ptr32 = num;
313 break;
314 case 2:
315 ptr16 = (__s16 *) info->ptr;
316 *ptr16 = num;
317 break;
318 case 1:
319 ptr8 = (__s8 *) info->ptr;
320 *ptr8 = num;
321 break;
322 }
323 return 0;
324 }
325
parse_string(struct field_set_info * info,char * arg)326 static errcode_t parse_string(struct field_set_info *info, char *arg)
327 {
328 char *cp = (char *) info->ptr;
329
330 if (strlen(arg) >= info->size) {
331 fprintf(stderr, "Error maximum size for %s is %d.\n",
332 info->name, info->size);
333 return EINVAL;
334 }
335 strcpy(cp, arg);
336 return 0;
337 }
338
parse_time(struct field_set_info * info,char * arg)339 static errcode_t parse_time(struct field_set_info *info, char *arg)
340 {
341 time_t t;
342 __u32 *ptr32;
343
344 ptr32 = (__u32 *) info->ptr;
345
346 t = string_to_time(arg);
347
348 if (t == ((time_t) -1)) {
349 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
350 arg, info->name);
351 return EINVAL;
352 }
353 *ptr32 = t;
354 return 0;
355 }
356
parse_uuid(struct field_set_info * info,char * arg)357 static errcode_t parse_uuid(struct field_set_info *info, char *arg)
358 {
359 unsigned char * p = (unsigned char *) info->ptr;
360
361 if ((strcasecmp(arg, "null") == 0) ||
362 (strcasecmp(arg, "clear") == 0)) {
363 uuid_clear(p);
364 } else if (strcasecmp(arg, "time") == 0) {
365 uuid_generate_time(p);
366 } else if (strcasecmp(arg, "random") == 0) {
367 uuid_generate(p);
368 } else if (uuid_parse(arg, p)) {
369 fprintf(stderr, "Invalid UUID format: %s\n", arg);
370 return EINVAL;
371 }
372 return 0;
373 }
374
parse_hashalg(struct field_set_info * info,char * arg)375 static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
376 {
377 int hashv;
378 unsigned char *p = (unsigned char *) info->ptr;
379
380 hashv = e2p_string2hash(arg);
381 if (hashv < 0) {
382 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
383 return EINVAL;
384 }
385 *p = hashv;
386 return 0;
387 }
388
parse_bmap(struct field_set_info * info,char * arg)389 static errcode_t parse_bmap(struct field_set_info *info, char *arg)
390 {
391 unsigned long num;
392 blk_t blk;
393 errcode_t retval;
394 char *tmp;
395
396 num = strtoul(arg, &tmp, 0);
397 if (*tmp) {
398 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
399 arg, info->name);
400 return EINVAL;
401 }
402 blk = num;
403
404 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET,
405 array_idx, &blk);
406 if (retval) {
407 com_err("set_inode", retval, "while setting block map");
408 }
409 return retval;
410 }
411
parse_gd_csum(struct field_set_info * info,char * arg)412 static errcode_t parse_gd_csum(struct field_set_info *info, char *arg)
413 {
414
415 if (strcmp(arg, "calc") == 0) {
416 ext2fs_group_desc_csum_set(current_fs, set_bg);
417 set_gd = current_fs->group_desc[set_bg];
418 printf("Checksum set to 0x%04x\n",
419 current_fs->group_desc[set_bg].bg_checksum);
420 return 0;
421 }
422
423 return parse_uint(info, arg);
424 }
425
print_possible_fields(struct field_set_info * fields)426 static void print_possible_fields(struct field_set_info *fields)
427 {
428 struct field_set_info *ss;
429 const char *type, *cmd;
430 FILE *f;
431 char name[40], idx[40];
432
433 if (fields == super_fields) {
434 type = "Superblock";
435 cmd = "set_super_value";
436 } else if (fields == inode_fields) {
437 type = "Inode";
438 cmd = "set_inode";
439 } else {
440 type = "Block group descriptor";
441 cmd = "set_block_group";
442 }
443 f = open_pager();
444
445 fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
446
447 for (ss = fields ; ss->name ; ss++) {
448 type = "unknown";
449 if (ss->func == parse_string)
450 type = "string";
451 else if (ss->func == parse_int)
452 type = "integer";
453 else if (ss->func == parse_uint)
454 type = "unsigned integer";
455 else if (ss->func == parse_uuid)
456 type = "UUID";
457 else if (ss->func == parse_hashalg)
458 type = "hash algorithm";
459 else if (ss->func == parse_time)
460 type = "date/time";
461 else if (ss->func == parse_bmap)
462 type = "set physical->logical block map";
463 strcpy(name, ss->name);
464 if (ss->flags & FLAG_ARRAY) {
465 if (ss->max_idx > 0)
466 sprintf(idx, "[%d]", ss->max_idx);
467 else
468 strcpy(idx, "[]");
469 strcat(name, idx);
470 }
471 fprintf(f, "\t%-20s\t%s\n", name, type);
472 }
473 close_pager(f);
474 }
475
476
do_set_super(int argc,char * argv[])477 void do_set_super(int argc, char *argv[])
478 {
479 const char *usage = "<field> <value>\n"
480 "\t\"set_super_value -l\" will list the names of "
481 "superblock fields\n\twhich can be set.";
482 static struct field_set_info *ss;
483
484 if ((argc == 2) && !strcmp(argv[1], "-l")) {
485 print_possible_fields(super_fields);
486 return;
487 }
488
489 if (common_args_process(argc, argv, 3, 3, "set_super_value",
490 usage, CHECK_FS_RW))
491 return;
492
493 if ((ss = find_field(super_fields, argv[1])) == 0) {
494 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
495 return;
496 }
497 set_sb = *current_fs->super;
498 if (ss->func(ss, argv[2]) == 0) {
499 *current_fs->super = set_sb;
500 ext2fs_mark_super_dirty(current_fs);
501 }
502 }
503
do_set_inode(int argc,char * argv[])504 void do_set_inode(int argc, char *argv[])
505 {
506 const char *usage = "<inode> <field> <value>\n"
507 "\t\"set_inode_field -l\" will list the names of "
508 "the fields in an ext2 inode\n\twhich can be set.";
509 static struct field_set_info *ss;
510
511 if ((argc == 2) && !strcmp(argv[1], "-l")) {
512 print_possible_fields(inode_fields);
513 return;
514 }
515
516 if (common_args_process(argc, argv, 4, 4, "set_inode",
517 usage, CHECK_FS_RW))
518 return;
519
520 if ((ss = find_field(inode_fields, argv[2])) == 0) {
521 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
522 return;
523 }
524
525 set_ino = string_to_inode(argv[1]);
526 if (!set_ino)
527 return;
528
529 if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
530 return;
531
532 if (ss->func(ss, argv[3]) == 0) {
533 if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
534 return;
535 }
536 }
537
do_set_block_group_descriptor(int argc,char * argv[])538 void do_set_block_group_descriptor(int argc, char *argv[])
539 {
540 const char *usage = "<bg number> <field> <value>\n"
541 "\t\"set_block_group_descriptor -l\" will list the names of "
542 "the fields in a block group descriptor\n\twhich can be set.";
543 struct field_set_info *ss;
544 char *end;
545
546 if ((argc == 2) && !strcmp(argv[1], "-l")) {
547 print_possible_fields(ext2_bg_fields);
548 return;
549 }
550
551 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
552 usage, CHECK_FS_RW))
553 return;
554
555 set_bg = strtoul(argv[1], &end, 0);
556 if (*end) {
557 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
558 return;
559 }
560
561 if (set_bg >= current_fs->group_desc_count) {
562 com_err(argv[0], 0, "block group number too big: %d", set_bg);
563 return;
564 }
565
566
567 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) {
568 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
569 return;
570 }
571
572 set_gd = current_fs->group_desc[set_bg];
573
574 if (ss->func(ss, argv[3]) == 0) {
575 current_fs->group_desc[set_bg] = set_gd;
576 ext2fs_mark_super_dirty(current_fs);
577 }
578 }
579