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_large set_inode;
44 static struct ext2_group_desc set_gd;
45 static struct ext4_group_desc set_gd4;
46 static struct mmp_struct set_mmp;
47 static dgrp_t set_bg;
48 static ext2_ino_t set_ino;
49 static int array_idx;
50
51 #define FLAG_ARRAY 0x0001
52
53 struct field_set_info {
54 const char *name;
55 void *ptr;
56 void *ptr2;
57 unsigned int size;
58 errcode_t (*func)(struct field_set_info *info, char *field, char *arg);
59 int flags;
60 int max_idx;
61 };
62
63 static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg);
64 static errcode_t parse_int(struct field_set_info *info, char *field, char *arg);
65 static errcode_t parse_string(struct field_set_info *info, char *field, char *arg);
66 static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg);
67 static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg);
68 static errcode_t parse_time(struct field_set_info *info, char *field, char *arg);
69 static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg);
70 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg);
71 static errcode_t parse_mmp_clear(struct field_set_info *info, char *field,
72 char *arg);
73
74 static struct field_set_info super_fields[] = {
75 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
76 { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi,
77 4, parse_uint },
78 { "r_blocks_count", &set_sb.s_r_blocks_count,
79 &set_sb.s_r_blocks_count_hi, 4, parse_uint },
80 { "free_blocks_count", &set_sb.s_free_blocks_count,
81 &set_sb.s_free_blocks_hi, 4, parse_uint },
82 { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint },
83 { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint },
84 { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint },
85 { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int },
86 { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint },
87 { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint },
88 { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint },
89 { "mtime", &set_sb.s_mtime, NULL, 4, parse_time },
90 { "wtime", &set_sb.s_wtime, NULL, 4, parse_time },
91 { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint },
92 { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int },
93 /* s_magic */
94 { "state", &set_sb.s_state, NULL, 2, parse_uint },
95 { "errors", &set_sb.s_errors, NULL, 2, parse_uint },
96 { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint },
97 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time },
98 { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint },
99 { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint },
100 { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint },
101 { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint },
102 { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint },
103 { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint },
104 { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint },
105 { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint },
106 { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint },
107 { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint },
108 { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint },
109 { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid },
110 { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string },
111 { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string },
112 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_uint },
113 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL,
114 4, parse_uint },
115 { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint },
116 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1,
117 parse_uint },
118 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2,
119 parse_uint },
120 { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid },
121 { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint },
122 { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint },
123 { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint },
124 { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid },
125 { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg },
126 { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint },
127 { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint },
128 { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint },
129 { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint },
130 { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time },
131 { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY,
132 17 },
133 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint },
134 { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint },
135 { "flags", &set_sb.s_flags, NULL, 4, parse_uint },
136 { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint },
137 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 4, parse_uint },
138 { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint },
139 { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint },
140 { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint },
141 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint },
142 { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint },
143 { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint },
144 { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint },
145 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count,
146 NULL, 8, parse_uint },
147 { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint },
148 { "mount_opts", &set_sb.s_mount_opts, NULL, 64, parse_string },
149 { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint },
150 { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint },
151 { "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint },
152 { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
153 { 0, 0, 0, 0 }
154 };
155
156 static struct field_set_info inode_fields[] = {
157 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
158 { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
159 { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
160 2, parse_uint },
161 { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
162 { "atime", &set_inode.i_atime, NULL, 4, parse_time },
163 { "ctime", &set_inode.i_ctime, NULL, 4, parse_time },
164 { "mtime", &set_inode.i_mtime, NULL, 4, parse_time },
165 { "dtime", &set_inode.i_dtime, NULL, 4, parse_time },
166 { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
167 2, parse_uint },
168 { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
169 /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
170 { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
171 6, parse_uint },
172 { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
173 { "version", &set_inode.osd1.linux1.l_i_version,
174 &set_inode.i_version_hi, 4, parse_uint },
175 { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint },
176 { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
177 EXT2_NDIR_BLOCKS },
178 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
179 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
180 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
181 { "generation", &set_inode.i_generation, NULL, 4, parse_uint },
182 /* Special case: i_file_acl_high is 2 bytes */
183 { "file_acl", &set_inode.i_file_acl,
184 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
185 { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint },
186 { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
187 { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint },
188 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
189 { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
190 &set_inode.i_checksum_hi, 2, parse_uint },
191 { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
192 4, parse_uint },
193 { "extra_isize", &set_inode.i_extra_isize, NULL,
194 2, parse_uint },
195 { "ctime_extra", &set_inode.i_ctime_extra, NULL,
196 4, parse_uint },
197 { "mtime_extra", &set_inode.i_mtime_extra, NULL,
198 4, parse_uint },
199 { "atime_extra", &set_inode.i_atime_extra, NULL,
200 4, parse_uint },
201 { "crtime", &set_inode.i_crtime, NULL, 4, parse_uint },
202 { "crtime_extra", &set_inode.i_crtime_extra, NULL,
203 4, parse_uint },
204 { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
205 { 0, 0, 0, 0 }
206 };
207
208 static struct field_set_info ext2_bg_fields[] = {
209 { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
210 { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
211 { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
212 { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
213 { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
214 { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
215 { "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
216 { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
217 { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
218 { 0, 0, 0, 0 }
219 };
220
221 static struct field_set_info ext4_bg_fields[] = {
222 { "block_bitmap", &set_gd4.bg_block_bitmap,
223 &set_gd4.bg_block_bitmap_hi, 4, parse_uint },
224 { "inode_bitmap", &set_gd4.bg_inode_bitmap,
225 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
226 { "inode_table", &set_gd4.bg_inode_table,
227 &set_gd4.bg_inode_table_hi, 4, parse_uint },
228 { "free_blocks_count", &set_gd4.bg_free_blocks_count,
229 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
230 { "free_inodes_count", &set_gd4.bg_free_inodes_count,
231 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
232 { "used_dirs_count", &set_gd4.bg_used_dirs_count,
233 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
234 { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
235 { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
236 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
237 { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
238 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
239 { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
240 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
241 { "itable_unused", &set_gd4.bg_itable_unused,
242 &set_gd4.bg_itable_unused_hi, 2, parse_uint },
243 { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
244 { 0, 0, 0, 0 }
245 };
246
247 static struct field_set_info mmp_fields[] = {
248 { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear },
249 { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
250 { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
251 { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
252 { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
253 parse_string },
254 { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
255 parse_string },
256 { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
257 };
258
check_suffix(const char * field)259 static int check_suffix(const char *field)
260 {
261 int len = strlen(field);
262
263 if (len <= 3)
264 return 0;
265 field += len-3;
266 if (!strcmp(field, "_lo"))
267 return 1;
268 if (!strcmp(field, "_hi"))
269 return 2;
270 return 0;
271 }
272
find_field(struct field_set_info * fields,char * field)273 static struct field_set_info *find_field(struct field_set_info *fields,
274 char *field)
275 {
276 struct field_set_info *ss;
277 const char *prefix;
278 char *arg, *delim, *idx, *tmp;
279 int suffix, prefix_len;
280
281 if (fields == super_fields)
282 prefix = "s_";
283 else if (fields == inode_fields)
284 prefix = "i_";
285 else
286 prefix = "bg_";
287 prefix_len = strlen(prefix);
288 if (strncmp(field, prefix, prefix_len) == 0)
289 field += prefix_len;
290
291 arg = malloc(strlen(field)+1);
292 if (!arg)
293 return NULL;
294 strcpy(arg, field);
295
296 idx = strchr(arg, '[');
297 if (idx) {
298 *idx++ = 0;
299 delim = idx + strlen(idx) - 1;
300 if (!*idx || *delim != ']')
301 idx = 0;
302 else
303 *delim = 0;
304 }
305 /*
306 * Can we parse the number?
307 */
308 if (idx) {
309 array_idx = strtol(idx, &tmp, 0);
310 if (*tmp)
311 idx = 0;
312 }
313
314 /*
315 * If there is a valid _hi or a _lo suffix, strip it off
316 */
317 suffix = check_suffix(arg);
318 if (suffix > 0)
319 arg[strlen(arg)-3] = 0;
320
321 for (ss = fields ; ss->name ; ss++) {
322 if (suffix && ss->ptr2 == 0)
323 continue;
324 if (ss->flags & FLAG_ARRAY) {
325 if (!idx || (strcmp(ss->name, arg) != 0))
326 continue;
327 if (ss->max_idx > 0 && array_idx >= ss->max_idx)
328 continue;
329 } else {
330 if (strcmp(ss->name, arg) != 0)
331 continue;
332 }
333 free(arg);
334 return ss;
335 }
336 free(arg);
337 return NULL;
338 }
339
340 /*
341 * Note: info->size == 6 is special; this means a base size 4 bytes,
342 * and secondiory (high) size of 2 bytes. This is needed for the
343 * special case of i_blocks_high and i_file_acl_high.
344 */
parse_uint(struct field_set_info * info,char * field,char * arg)345 static errcode_t parse_uint(struct field_set_info *info, char *field,
346 char *arg)
347 {
348 unsigned long long n, num, mask, limit;
349 int suffix = check_suffix(field);
350 char *tmp;
351 void *field1 = info->ptr, *field2 = info->ptr2;
352 int size = (info->size == 6) ? 4 : info->size;
353 union {
354 __u64 *ptr64;
355 __u32 *ptr32;
356 __u16 *ptr16;
357 __u8 *ptr8;
358 } u;
359
360 if (suffix == 1)
361 field2 = 0;
362 if (suffix == 2) {
363 field1 = field2;
364 field2 = 0;
365 }
366
367 u.ptr8 = (__u8 *) field1;
368 if (info->flags & FLAG_ARRAY)
369 u.ptr8 += array_idx * info->size;
370
371 errno = 0;
372 num = STRTOULL(arg, &tmp, 0);
373 if (*tmp || errno) {
374 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
375 arg, info->name);
376 return EINVAL;
377 }
378 mask = ~0ULL >> ((8 - size) * 8);
379 limit = ~0ULL >> ((8 - info->size) * 8);
380 if (field2 && info->size != 6)
381 limit = ~0ULL >> ((8 - info->size*2) * 8);
382
383 if (num > limit) {
384 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
385 arg, info->name, limit);
386 return EINVAL;
387 }
388 n = num & mask;
389 switch (size) {
390 case 8:
391 /* Should never get here */
392 fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
393 "defined; BUG?!?\n", info->name);
394 *u.ptr64 = 0;
395 break;
396 case 4:
397 *u.ptr32 = n;
398 break;
399 case 2:
400 *u.ptr16 = n;
401 break;
402 case 1:
403 *u.ptr8 = n;
404 break;
405 }
406 if (!field2)
407 return 0;
408 n = num >> (size*8);
409 u.ptr8 = (__u8 *) field2;
410 if (info->size == 6)
411 size = 2;
412 switch (size) {
413 case 8:
414 *u.ptr64 = n;
415 break;
416 case 4:
417 *u.ptr32 = n;
418 break;
419 case 2:
420 *u.ptr16 = n;
421 break;
422 case 1:
423 *u.ptr8 = n;
424 break;
425 }
426 return 0;
427 }
428
parse_int(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)429 static errcode_t parse_int(struct field_set_info *info,
430 char *field EXT2FS_ATTR((unused)), char *arg)
431 {
432 long num;
433 char *tmp;
434 __s32 *ptr32;
435 __s16 *ptr16;
436 __s8 *ptr8;
437
438 num = strtol(arg, &tmp, 0);
439 if (*tmp) {
440 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
441 arg, info->name);
442 return EINVAL;
443 }
444 switch (info->size) {
445 case 4:
446 ptr32 = (__s32 *) info->ptr;
447 *ptr32 = num;
448 break;
449 case 2:
450 ptr16 = (__s16 *) info->ptr;
451 *ptr16 = num;
452 break;
453 case 1:
454 ptr8 = (__s8 *) info->ptr;
455 *ptr8 = num;
456 break;
457 }
458 return 0;
459 }
460
parse_string(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)461 static errcode_t parse_string(struct field_set_info *info,
462 char *field EXT2FS_ATTR((unused)), char *arg)
463 {
464 char *cp = (char *) info->ptr;
465
466 if (strlen(arg) >= info->size) {
467 fprintf(stderr, "Error maximum size for %s is %d.\n",
468 info->name, info->size);
469 return EINVAL;
470 }
471 strcpy(cp, arg);
472 return 0;
473 }
474
parse_time(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)475 static errcode_t parse_time(struct field_set_info *info,
476 char *field EXT2FS_ATTR((unused)), char *arg)
477 {
478 time_t t;
479 __u32 *ptr32;
480
481 ptr32 = (__u32 *) info->ptr;
482
483 t = string_to_time(arg);
484
485 if (t == ((time_t) -1)) {
486 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
487 arg, info->name);
488 return EINVAL;
489 }
490 *ptr32 = t;
491 return 0;
492 }
493
parse_uuid(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)494 static errcode_t parse_uuid(struct field_set_info *info,
495 char *field EXT2FS_ATTR((unused)), char *arg)
496 {
497 unsigned char * p = (unsigned char *) info->ptr;
498
499 if ((strcasecmp(arg, "null") == 0) ||
500 (strcasecmp(arg, "clear") == 0)) {
501 uuid_clear(p);
502 } else if (strcasecmp(arg, "time") == 0) {
503 uuid_generate_time(p);
504 } else if (strcasecmp(arg, "random") == 0) {
505 uuid_generate(p);
506 } else if (uuid_parse(arg, p)) {
507 fprintf(stderr, "Invalid UUID format: %s\n", arg);
508 return EINVAL;
509 }
510 return 0;
511 }
512
parse_hashalg(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)513 static errcode_t parse_hashalg(struct field_set_info *info,
514 char *field EXT2FS_ATTR((unused)), char *arg)
515 {
516 int hashv;
517 unsigned char *p = (unsigned char *) info->ptr;
518
519 hashv = e2p_string2hash(arg);
520 if (hashv < 0) {
521 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
522 return EINVAL;
523 }
524 *p = hashv;
525 return 0;
526 }
527
parse_bmap(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)528 static errcode_t parse_bmap(struct field_set_info *info,
529 char *field EXT2FS_ATTR((unused)), char *arg)
530 {
531 blk64_t blk;
532 errcode_t retval;
533 char *tmp;
534
535 blk = strtoull(arg, &tmp, 0);
536 if (*tmp) {
537 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
538 arg, info->name);
539 return EINVAL;
540 }
541
542 retval = ext2fs_bmap2(current_fs, set_ino,
543 (struct ext2_inode *) &set_inode,
544 NULL, BMAP_SET, array_idx, NULL, &blk);
545 if (retval) {
546 com_err("set_inode", retval, "while setting block map");
547 }
548 return retval;
549 }
550
parse_gd_csum(struct field_set_info * info,char * field,char * arg)551 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
552 char *arg)
553 {
554
555 if (strcmp(arg, "calc") == 0) {
556 ext2fs_group_desc_csum_set(current_fs, set_bg);
557 memcpy(&set_gd, ext2fs_group_desc(current_fs,
558 current_fs->group_desc,
559 set_bg),
560 sizeof(set_gd));
561 printf("Checksum set to 0x%04x\n",
562 ext2fs_bg_checksum(current_fs, set_bg));
563 return 0;
564 }
565
566 return parse_uint(info, field, arg);
567 }
568
print_possible_fields(struct field_set_info * fields)569 static void print_possible_fields(struct field_set_info *fields)
570 {
571 struct field_set_info *ss;
572 const char *type, *cmd;
573 FILE *f;
574 char name[40], idx[40];
575
576 if (fields == super_fields) {
577 type = "Superblock";
578 cmd = "set_super_value";
579 } else if (fields == inode_fields) {
580 type = "Inode";
581 cmd = "set_inode";
582 } else if (fields == mmp_fields) {
583 type = "MMP";
584 cmd = "set_mmp_value";
585 } else {
586 type = "Block group descriptor";
587 cmd = "set_block_group";
588 }
589 f = open_pager();
590
591 fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
592
593 for (ss = fields ; ss->name ; ss++) {
594 type = "unknown";
595 if (ss->func == parse_string)
596 type = "string";
597 else if (ss->func == parse_int)
598 type = "integer";
599 else if (ss->func == parse_uint)
600 type = "unsigned integer";
601 else if (ss->func == parse_uuid)
602 type = "UUID";
603 else if (ss->func == parse_hashalg)
604 type = "hash algorithm";
605 else if (ss->func == parse_time)
606 type = "date/time";
607 else if (ss->func == parse_bmap)
608 type = "set physical->logical block map";
609 else if (ss->func == parse_gd_csum)
610 type = "unsigned integer OR \"calc\"";
611 strcpy(name, ss->name);
612 if (ss->flags & FLAG_ARRAY) {
613 if (ss->max_idx > 0)
614 sprintf(idx, "[%d]", ss->max_idx);
615 else
616 strcpy(idx, "[]");
617 strcat(name, idx);
618 }
619 if (ss->ptr2)
620 strcat(name, "[_hi|_lo]");
621 fprintf(f, "\t%-25s\t%s\n", name, type);
622 }
623 close_pager(f);
624 }
625
626
do_set_super(int argc,char * argv[])627 void do_set_super(int argc, char *argv[])
628 {
629 const char *usage = "<field> <value>\n"
630 "\t\"set_super_value -l\" will list the names of "
631 "superblock fields\n\twhich can be set.";
632 static struct field_set_info *ss;
633
634 if ((argc == 2) && !strcmp(argv[1], "-l")) {
635 print_possible_fields(super_fields);
636 return;
637 }
638
639 if (common_args_process(argc, argv, 3, 3, "set_super_value",
640 usage, CHECK_FS_RW))
641 return;
642
643 if ((ss = find_field(super_fields, argv[1])) == 0) {
644 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
645 return;
646 }
647 set_sb = *current_fs->super;
648 if (ss->func(ss, argv[1], argv[2]) == 0) {
649 *current_fs->super = set_sb;
650 ext2fs_mark_super_dirty(current_fs);
651 }
652 }
653
do_set_inode(int argc,char * argv[])654 void do_set_inode(int argc, char *argv[])
655 {
656 const char *usage = "<inode> <field> <value>\n"
657 "\t\"set_inode_field -l\" will list the names of "
658 "the fields in an ext2 inode\n\twhich can be set.";
659 static struct field_set_info *ss;
660
661 if ((argc == 2) && !strcmp(argv[1], "-l")) {
662 print_possible_fields(inode_fields);
663 return;
664 }
665
666 if (common_args_process(argc, argv, 4, 4, "set_inode",
667 usage, CHECK_FS_RW))
668 return;
669
670 if ((ss = find_field(inode_fields, argv[2])) == 0) {
671 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
672 return;
673 }
674
675 set_ino = string_to_inode(argv[1]);
676 if (!set_ino)
677 return;
678
679 if (debugfs_read_inode_full(set_ino,
680 (struct ext2_inode *) &set_inode, argv[1],
681 sizeof(set_inode)))
682 return;
683
684 if (ss->func(ss, argv[2], argv[3]) == 0) {
685 if (debugfs_write_inode_full(set_ino,
686 (struct ext2_inode *) &set_inode,
687 argv[1], sizeof(set_inode)))
688 return;
689 }
690 }
691
do_set_block_group_descriptor(int argc,char * argv[])692 void do_set_block_group_descriptor(int argc, char *argv[])
693 {
694 const char *usage = "<bg number> <field> <value>\n"
695 "\t\"set_block_group_descriptor -l\" will list the names of "
696 "the fields in a block group descriptor\n\twhich can be set.";
697 struct field_set_info *table;
698 struct field_set_info *ss;
699 char *end;
700 void *edit, *target;
701 int size;
702
703 /*
704 * Determine whether we are editing an ext2 or ext4 block group
705 * descriptor. Descriptors larger than ext4_group_desc cannot
706 * have their fields edited yet, because they do not have any
707 * names assigned. When that happens, this function needs to
708 * be updated for the new descriptor struct and fields.
709 */
710 if (current_fs &&
711 EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) {
712 table = ext4_bg_fields;
713 edit = &set_gd4;
714 size = sizeof(set_gd4);
715 } else {
716 table = ext2_bg_fields;
717 edit = &set_gd;
718 size = sizeof(set_gd);
719 }
720
721 if ((argc == 2) && !strcmp(argv[1], "-l")) {
722 print_possible_fields(table);
723 return;
724 }
725
726 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
727 usage, CHECK_FS_RW))
728 return;
729
730 set_bg = strtoul(argv[1], &end, 0);
731 if (*end) {
732 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
733 return;
734 }
735
736 if (set_bg >= current_fs->group_desc_count) {
737 com_err(argv[0], 0, "block group number too big: %d", set_bg);
738 return;
739 }
740
741 if ((ss = find_field(table, argv[2])) == 0) {
742 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
743 return;
744 }
745
746 target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
747 memcpy(edit, target, size);
748 if (ss->func(ss, argv[2], argv[3]) == 0) {
749 memcpy(target, edit, size);
750 ext2fs_mark_super_dirty(current_fs);
751 }
752 }
753
parse_mmp_clear(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg EXT2FS_ATTR ((unused)))754 static errcode_t parse_mmp_clear(struct field_set_info *info,
755 char *field EXT2FS_ATTR((unused)),
756 char *arg EXT2FS_ATTR((unused)))
757 {
758 errcode_t retval;
759
760 retval = ext2fs_mmp_clear(current_fs);
761 if (retval != 0)
762 com_err("set_mmp_value", retval, "while clearing MMP block\n");
763 else
764 memcpy(info->ptr, current_fs->mmp_buf, info->size);
765
766 return 1; /* we don't need the MMP block written again */
767 }
768
do_set_mmp_value(int argc,char * argv[])769 void do_set_mmp_value(int argc, char *argv[])
770 {
771 const char *usage = "<field> <value>\n"
772 "\t\"set_mmp_value -l\" will list the names of "
773 "MMP fields\n\twhich can be set.";
774 static struct field_set_info *smmp;
775 struct mmp_struct *mmp_s;
776 errcode_t retval;
777
778 if (argc == 2 && strcmp(argv[1], "-l") == 0) {
779 print_possible_fields(mmp_fields);
780 return;
781 }
782
783 if (check_fs_open(argv[0]))
784 return;
785
786 if (current_fs->super->s_mmp_block == 0) {
787 com_err(argv[0], 0, "no MMP block allocated\n");
788 return;
789 }
790
791 if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
792 usage, CHECK_FS_RW))
793 return;
794
795 mmp_s = current_fs->mmp_buf;
796 if (mmp_s == NULL) {
797 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
798 if (retval) {
799 com_err(argv[0], retval, "allocating MMP buffer\n");
800 return;
801 }
802 retval = ext2fs_mmp_read(current_fs,
803 current_fs->super->s_mmp_block, mmp_s);
804 if (retval) {
805 com_err(argv[0], retval, "reading MMP block %llu.\n",
806 (long long)current_fs->super->s_mmp_block);
807 ext2fs_free_mem(&mmp_s);
808 return;
809 }
810 current_fs->mmp_buf = mmp_s;
811 }
812
813 smmp = find_field(mmp_fields, argv[1]);
814 if (smmp == 0) {
815 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
816 return;
817 }
818
819 set_mmp = *mmp_s;
820 if (smmp->func(smmp, argv[1], argv[2]) == 0) {
821 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
822 &set_mmp);
823 *mmp_s = set_mmp;
824 }
825 }
826
827