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 "config.h"
21 #include <stdio.h>
22 #include <unistd.h>
23 #include <stdlib.h>
24 #include <ctype.h>
25 #include <string.h>
26 #include <strings.h>
27 #include <time.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #ifdef HAVE_ERRNO_H
31 #include <errno.h>
32 #endif
33 #include <assert.h>
34 #if HAVE_STRINGS_H
35 #include <strings.h>
36 #endif
37 #include <fcntl.h>
38 #include <utime.h>
39
40 #include "debugfs.h"
41 #include "uuid/uuid.h"
42 #include "e2p/e2p.h"
43 #include "support/quotaio.h"
44
45 static struct ext2_super_block set_sb;
46 static struct ext2_inode_large set_inode;
47 static struct ext2_group_desc set_gd;
48 static struct ext4_group_desc set_gd4;
49 static struct mmp_struct set_mmp;
50 static dgrp_t set_bg;
51 static ext2_ino_t set_ino;
52 static int array_idx;
53
54 #define FLAG_ARRAY 0x0001
55 #define FLAG_ALIAS 0x0002 /* Data intersects with other field */
56
57 struct field_set_info {
58 const char *name;
59 void *ptr;
60 void *ptr2;
61 unsigned int size;
62 errcode_t (*func)(struct field_set_info *info, char *field, char *arg);
63 int flags;
64 int max_idx;
65 };
66
67 static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg);
68 static errcode_t parse_int(struct field_set_info *info, char *field, char *arg);
69 static errcode_t parse_string(struct field_set_info *info, char *field, char *arg);
70 static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg);
71 static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg);
72 static errcode_t parse_time(struct field_set_info *info, char *field, char *arg);
73 static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg);
74 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg);
75 static errcode_t parse_mmp_clear(struct field_set_info *info, char *field,
76 char *arg);
77
78 #pragma GCC diagnostic push
79 #pragma GCC diagnostic ignored "-Wmissing-field-initializers"
80
81 static struct field_set_info super_fields[] = {
82 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
83 { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi,
84 4, parse_uint },
85 { "r_blocks_count", &set_sb.s_r_blocks_count,
86 &set_sb.s_r_blocks_count_hi, 4, parse_uint },
87 { "free_blocks_count", &set_sb.s_free_blocks_count,
88 &set_sb.s_free_blocks_hi, 4, parse_uint },
89 { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint },
90 { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint },
91 { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint },
92 { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int },
93 { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint },
94 { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint },
95 { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint },
96 { "mtime", &set_sb.s_mtime, NULL, 4, parse_time },
97 { "wtime", &set_sb.s_wtime, NULL, 4, parse_time },
98 { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint },
99 { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int },
100 /* s_magic */
101 { "state", &set_sb.s_state, NULL, 2, parse_uint },
102 { "errors", &set_sb.s_errors, NULL, 2, parse_uint },
103 { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint },
104 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time },
105 { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint },
106 { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint },
107 { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint },
108 { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint },
109 { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint },
110 { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint },
111 { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint },
112 { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint },
113 { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint },
114 { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint },
115 { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint },
116 { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid },
117 { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string },
118 { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string },
119 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL,
120 4, parse_uint },
121 { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint },
122 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1,
123 parse_uint },
124 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2,
125 parse_uint },
126 { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid },
127 { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint },
128 { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint },
129 { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint },
130 { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid },
131 { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg },
132 { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint },
133 { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint },
134 { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint },
135 { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint },
136 { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time },
137 { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY,
138 17 },
139 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint },
140 { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint },
141 { "flags", &set_sb.s_flags, NULL, 4, parse_uint },
142 { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint },
143 { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint },
144 { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint },
145 { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint },
146 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint },
147 { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint },
148 { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint },
149 { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint },
150 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count,
151 NULL, 8, parse_uint },
152 { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint },
153 { "mount_opts", &set_sb.s_mount_opts, NULL, 64, parse_string },
154 { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint },
155 { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint },
156 { "prj_quota_inum", &set_sb.s_prj_quota_inum, NULL, 4, parse_uint },
157 { "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint },
158 { "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint,
159 FLAG_ARRAY, 2 },
160 { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
161 { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint },
162 { "encryption_level", &set_sb.s_encryption_level, NULL, 1, parse_uint },
163 { "error_count", &set_sb.s_error_count, NULL, 4, parse_uint },
164 { "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time },
165 { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
166 { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint },
167 { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string },
168 { "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint },
169 { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time },
170 { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
171 { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint },
172 { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string },
173 { "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint },
174 { "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint,
175 FLAG_ARRAY, 4 },
176 { "encrypt_pw_salt", &set_sb.s_encrypt_pw_salt, NULL, 16, parse_uuid },
177 { "lpf_ino", &set_sb.s_lpf_ino, NULL, 4, parse_uint },
178 { "checksum_seed", &set_sb.s_checksum_seed, NULL, 4, parse_uint },
179 { 0, 0, 0, 0 }
180 };
181
182 static struct field_set_info inode_fields[] = {
183 { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
184 { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
185 2, parse_uint },
186 { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
187 { "atime", &set_inode.i_atime, &set_inode.i_atime_extra,
188 4, parse_time },
189 { "ctime", &set_inode.i_ctime, &set_inode.i_ctime_extra,
190 4, parse_time },
191 { "mtime", &set_inode.i_mtime, &set_inode.i_mtime_extra,
192 4, parse_time },
193 { "dtime", &set_inode.i_dtime, NULL,
194 4, parse_time },
195 { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
196 2, parse_uint },
197 { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
198 /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
199 { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
200 6, parse_uint },
201 { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
202 { "version", &set_inode.osd1.linux1.l_i_version,
203 &set_inode.i_version_hi, 4, parse_uint },
204 { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL,
205 4, parse_uint, FLAG_ALIAS },
206 { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
207 EXT2_NDIR_BLOCKS },
208 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
209 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
210 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
211 { "generation", &set_inode.i_generation, NULL, 4, parse_uint },
212 /* Special case: i_file_acl_high is 2 bytes */
213 { "file_acl", &set_inode.i_file_acl,
214 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
215 { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint, FLAG_ALIAS },
216 { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
217 { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS },
218 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
219 { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
220 &set_inode.i_checksum_hi, 2, parse_uint },
221 { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
222 4, parse_uint, FLAG_ALIAS },
223 { "extra_isize", &set_inode.i_extra_isize, NULL,
224 2, parse_uint },
225 { "ctime_extra", &set_inode.i_ctime_extra, NULL,
226 4, parse_uint, FLAG_ALIAS },
227 { "mtime_extra", &set_inode.i_mtime_extra, NULL,
228 4, parse_uint, FLAG_ALIAS },
229 { "atime_extra", &set_inode.i_atime_extra, NULL,
230 4, parse_uint, FLAG_ALIAS },
231 { "crtime", &set_inode.i_crtime, &set_inode.i_crtime_extra,
232 4, parse_time },
233 { "crtime_extra", &set_inode.i_crtime_extra, NULL,
234 4, parse_uint, FLAG_ALIAS },
235 { "projid", &set_inode.i_projid, NULL, 4, parse_uint },
236 { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
237 { 0, 0, 0, 0 }
238 };
239
240 static struct field_set_info ext2_bg_fields[] = {
241 { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
242 { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
243 { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
244 { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
245 { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
246 { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
247 { "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
248 { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
249 { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
250 { 0, 0, 0, 0 }
251 };
252
253 static struct field_set_info ext4_bg_fields[] = {
254 { "block_bitmap", &set_gd4.bg_block_bitmap,
255 &set_gd4.bg_block_bitmap_hi, 4, parse_uint },
256 { "inode_bitmap", &set_gd4.bg_inode_bitmap,
257 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
258 { "inode_table", &set_gd4.bg_inode_table,
259 &set_gd4.bg_inode_table_hi, 4, parse_uint },
260 { "free_blocks_count", &set_gd4.bg_free_blocks_count,
261 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
262 { "free_inodes_count", &set_gd4.bg_free_inodes_count,
263 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
264 { "used_dirs_count", &set_gd4.bg_used_dirs_count,
265 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
266 { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
267 { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
268 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
269 { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
270 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
271 { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
272 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
273 { "itable_unused", &set_gd4.bg_itable_unused,
274 &set_gd4.bg_itable_unused_hi, 2, parse_uint },
275 { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
276 { 0, 0, 0, 0 }
277 };
278
279 static struct field_set_info mmp_fields[] = {
280 { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp),
281 parse_mmp_clear, FLAG_ALIAS },
282 { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
283 { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
284 { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
285 { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
286 parse_string },
287 { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
288 parse_string },
289 { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
290 { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
291 { 0, 0, 0, 0 }
292 };
293 #pragma GCC diagnostic pop
294
295 #ifdef UNITTEST
296
297
do_verify_field_set_info(struct field_set_info * fields,const void * data,size_t size)298 static void do_verify_field_set_info(struct field_set_info *fields,
299 const void *data, size_t size)
300 {
301 struct field_set_info *ss, *ss2;
302 const char *begin = (char *)data;
303 const char *end = begin + size;
304
305 for (ss = fields ; ss->name ; ss++) {
306 const char *ptr;
307
308 /* Check pointers */
309 ptr = ss->ptr;
310 assert(!ptr || (ptr >= begin && ptr < end));
311 ptr = ss->ptr2;
312 assert(!ptr || (ptr >= begin && ptr < end));
313
314 /* Check function */
315 assert(ss->func);
316
317 for (ss2 = fields ; ss2 != ss ; ss2++) {
318 /* Check duplicate names */
319 assert(strcmp(ss->name, ss2->name));
320
321 if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS)
322 continue;
323 /* Check false aliases, might be copy-n-paste error */
324 assert(!ss->ptr || (ss->ptr != ss2->ptr &&
325 ss->ptr != ss2->ptr2));
326 assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr &&
327 ss->ptr2 != ss2->ptr2));
328 }
329 }
330 }
331
main(int argc,char ** argv)332 int main(int argc, char **argv)
333 {
334 do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb));
335 do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode));
336 do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd));
337 do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4));
338 do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp));
339 return 0;
340 }
341
342 ext2_filsys current_fs;
343 ext2_ino_t root, cwd;
344
345 #endif /* UNITTEST */
346
check_suffix(const char * field)347 static int check_suffix(const char *field)
348 {
349 int len = strlen(field);
350
351 if (len <= 3)
352 return 0;
353 field += len-3;
354 if (!strcmp(field, "_lo"))
355 return 1;
356 if (!strcmp(field, "_hi"))
357 return 2;
358 return 0;
359 }
360
find_field(struct field_set_info * fields,char * field)361 static struct field_set_info *find_field(struct field_set_info *fields,
362 char *field)
363 {
364 struct field_set_info *ss;
365 const char *prefix;
366 char *arg, *delim, *idx, *tmp;
367 int suffix, prefix_len;
368
369 if (fields == super_fields)
370 prefix = "s_";
371 else if (fields == inode_fields)
372 prefix = "i_";
373 else
374 prefix = "bg_";
375 prefix_len = strlen(prefix);
376 if (strncmp(field, prefix, prefix_len) == 0)
377 field += prefix_len;
378
379 arg = malloc(strlen(field)+1);
380 if (!arg)
381 return NULL;
382 strcpy(arg, field);
383
384 idx = strchr(arg, '[');
385 if (idx) {
386 *idx++ = 0;
387 delim = idx + strlen(idx) - 1;
388 if (!*idx || *delim != ']')
389 idx = 0;
390 else
391 *delim = 0;
392 }
393 /*
394 * Can we parse the number?
395 */
396 if (idx) {
397 array_idx = strtol(idx, &tmp, 0);
398 if (*tmp) {
399 *(--idx) = '[';
400 *delim = ']';
401 idx = 0;
402 }
403 }
404
405 /*
406 * If there is a valid _hi or a _lo suffix, strip it off
407 */
408 suffix = check_suffix(arg);
409 if (suffix > 0)
410 arg[strlen(arg)-3] = 0;
411
412 for (ss = fields ; ss->name ; ss++) {
413 if (suffix && ss->ptr2 == 0)
414 continue;
415 if (ss->flags & FLAG_ARRAY) {
416 if (!idx || (strcmp(ss->name, arg) != 0))
417 continue;
418 if (ss->max_idx > 0 && array_idx >= ss->max_idx)
419 continue;
420 } else {
421 if (strcmp(ss->name, arg) != 0)
422 continue;
423 }
424 free(arg);
425 return ss;
426 }
427 free(arg);
428 return NULL;
429 }
430
431 /*
432 * Note: info->size == 6 is special; this means a base size 4 bytes,
433 * and secondiory (high) size of 2 bytes. This is needed for the
434 * special case of i_blocks_high and i_file_acl_high.
435 */
parse_uint(struct field_set_info * info,char * field,char * arg)436 static errcode_t parse_uint(struct field_set_info *info, char *field,
437 char *arg)
438 {
439 unsigned long long n, num, mask, limit;
440 int suffix = check_suffix(field);
441 char *tmp;
442 void *field1 = info->ptr, *field2 = info->ptr2;
443 int size = (info->size == 6) ? 4 : info->size;
444 union {
445 __u64 *ptr64;
446 __u32 *ptr32;
447 __u16 *ptr16;
448 __u8 *ptr8;
449 } u;
450
451 if (suffix == 1)
452 field2 = 0;
453 if (suffix == 2) {
454 field1 = field2;
455 field2 = 0;
456 }
457
458 u.ptr8 = (__u8 *) field1;
459 if (info->flags & FLAG_ARRAY)
460 u.ptr8 += array_idx * info->size;
461
462 errno = 0;
463 num = STRTOULL(arg, &tmp, 0);
464 if (*tmp || errno) {
465 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
466 arg, info->name);
467 return EINVAL;
468 }
469 mask = ~0ULL >> ((8 - size) * 8);
470 limit = ~0ULL >> ((8 - info->size) * 8);
471 if (field2 && info->size != 6)
472 limit = ~0ULL >> ((8 - info->size*2) * 8);
473
474 if (num > limit) {
475 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
476 arg, info->name, limit);
477 return EINVAL;
478 }
479 n = num & mask;
480 switch (size) {
481 case 8:
482 /* Should never get here */
483 fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
484 "defined; BUG?!?\n", info->name);
485 *u.ptr64 = 0;
486 break;
487 case 4:
488 *u.ptr32 = n;
489 break;
490 case 2:
491 *u.ptr16 = n;
492 break;
493 case 1:
494 *u.ptr8 = n;
495 break;
496 }
497 if (!field2)
498 return 0;
499 n = num >> (size*8);
500 u.ptr8 = (__u8 *) field2;
501 if (info->size == 6)
502 size = 2;
503 switch (size) {
504 case 8:
505 *u.ptr64 = n;
506 break;
507 case 4:
508 *u.ptr32 = n;
509 break;
510 case 2:
511 *u.ptr16 = n;
512 break;
513 case 1:
514 *u.ptr8 = n;
515 break;
516 }
517 return 0;
518 }
519
parse_int(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)520 static errcode_t parse_int(struct field_set_info *info,
521 char *field EXT2FS_ATTR((unused)), char *arg)
522 {
523 long num;
524 char *tmp;
525 __s32 *ptr32;
526 __s16 *ptr16;
527 __s8 *ptr8;
528
529 num = strtol(arg, &tmp, 0);
530 if (*tmp) {
531 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
532 arg, info->name);
533 return EINVAL;
534 }
535 switch (info->size) {
536 case 4:
537 ptr32 = (__s32 *) info->ptr;
538 *ptr32 = num;
539 break;
540 case 2:
541 ptr16 = (__s16 *) info->ptr;
542 *ptr16 = num;
543 break;
544 case 1:
545 ptr8 = (__s8 *) info->ptr;
546 *ptr8 = num;
547 break;
548 }
549 return 0;
550 }
551
parse_string(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)552 static errcode_t parse_string(struct field_set_info *info,
553 char *field EXT2FS_ATTR((unused)), char *arg)
554 {
555 char *cp = (char *) info->ptr;
556
557 if (strlen(arg) >= info->size) {
558 fprintf(stderr, "Error maximum size for %s is %d.\n",
559 info->name, info->size);
560 return EINVAL;
561 }
562 strcpy(cp, arg);
563 return 0;
564 }
565
parse_time(struct field_set_info * info,char * field,char * arg)566 static errcode_t parse_time(struct field_set_info *info,
567 char *field, char *arg)
568 {
569 __s64 t;
570 __u32 t_low, t_high;
571 __u32 *ptr_low, *ptr_high;
572
573 if (check_suffix(field))
574 return parse_uint(info, field, arg);
575
576 ptr_low = (__u32 *) info->ptr;
577 ptr_high = (__u32 *) info->ptr2;
578
579 t = string_to_time(arg);
580
581 if (t == -1) {
582 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
583 arg, info->name);
584 return EINVAL;
585 }
586 t_low = (__u32) t;
587 t_high = ((t - (__s32)t) >> 32) & EXT4_EPOCH_MASK;
588 *ptr_low = t_low;
589 if (ptr_high)
590 *ptr_high = (*ptr_high & ~EXT4_EPOCH_MASK) | t_high;
591 return 0;
592 }
593
parse_uuid(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)594 static errcode_t parse_uuid(struct field_set_info *info,
595 char *field EXT2FS_ATTR((unused)), char *arg)
596 {
597 unsigned char * p = (unsigned char *) info->ptr;
598
599 if ((strcasecmp(arg, "null") == 0) ||
600 (strcasecmp(arg, "clear") == 0)) {
601 uuid_clear(p);
602 } else if (strcasecmp(arg, "time") == 0) {
603 uuid_generate_time(p);
604 } else if (strcasecmp(arg, "random") == 0) {
605 uuid_generate(p);
606 } else if (uuid_parse(arg, p)) {
607 fprintf(stderr, "Invalid UUID format: %s\n", arg);
608 return EINVAL;
609 }
610 return 0;
611 }
612
parse_hashalg(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)613 static errcode_t parse_hashalg(struct field_set_info *info,
614 char *field EXT2FS_ATTR((unused)), char *arg)
615 {
616 int hashv;
617 unsigned char *p = (unsigned char *) info->ptr;
618
619 hashv = e2p_string2hash(arg);
620 if (hashv < 0) {
621 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
622 return EINVAL;
623 }
624 *p = hashv;
625 return 0;
626 }
627
parse_bmap(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)628 static errcode_t parse_bmap(struct field_set_info *info,
629 char *field EXT2FS_ATTR((unused)), char *arg)
630 {
631 blk64_t blk;
632 errcode_t retval;
633 char *tmp;
634
635 blk = strtoull(arg, &tmp, 0);
636 if (*tmp) {
637 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
638 arg, info->name);
639 return EINVAL;
640 }
641
642 retval = ext2fs_bmap2(current_fs, set_ino,
643 (struct ext2_inode *) &set_inode,
644 NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL,
645 &blk);
646 if (retval) {
647 com_err("set_inode", retval, "while setting block map");
648 }
649 return retval;
650 }
651
parse_gd_csum(struct field_set_info * info,char * field,char * arg)652 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
653 char *arg)
654 {
655 __u16 *checksum = info->ptr;
656
657 if (strcmp(arg, "calc") == 0) {
658 *checksum = ext2fs_group_desc_csum(current_fs, set_bg);
659 printf("Checksum set to 0x%04x\n", *checksum);
660 return 0;
661 }
662 return parse_uint(info, field, arg);
663 }
664
print_possible_fields(struct field_set_info * fields)665 static void print_possible_fields(struct field_set_info *fields)
666 {
667 struct field_set_info *ss;
668 const char *type, *cmd;
669 FILE *f;
670 char name[40], idx[40];
671
672 if (fields == super_fields) {
673 type = "Superblock";
674 cmd = "set_super_value";
675 } else if (fields == inode_fields) {
676 type = "Inode";
677 cmd = "set_inode";
678 } else if (fields == mmp_fields) {
679 type = "MMP";
680 cmd = "set_mmp_value";
681 } else {
682 type = "Block group descriptor";
683 cmd = "set_block_group";
684 }
685 f = open_pager();
686
687 fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
688
689 for (ss = fields ; ss->name ; ss++) {
690 type = "unknown";
691 if (ss->func == parse_string)
692 type = "string";
693 else if (ss->func == parse_int)
694 type = "integer";
695 else if (ss->func == parse_uint)
696 type = "unsigned integer";
697 else if (ss->func == parse_uuid)
698 type = "UUID";
699 else if (ss->func == parse_hashalg)
700 type = "hash algorithm";
701 else if (ss->func == parse_time)
702 type = "date/time";
703 else if (ss->func == parse_bmap)
704 type = "set physical->logical block map";
705 else if (ss->func == parse_gd_csum)
706 type = "unsigned integer OR \"calc\"";
707 strcpy(name, ss->name);
708 if (ss->flags & FLAG_ARRAY) {
709 if (ss->max_idx > 0)
710 sprintf(idx, "[%d]", ss->max_idx);
711 else
712 strcpy(idx, "[]");
713 strcat(name, idx);
714 }
715 if (ss->ptr2)
716 strcat(name, "[_hi|_lo]");
717 fprintf(f, "\t%-25s\t%s\n", name, type);
718 }
719 close_pager(f);
720 }
721
722
do_set_super(int argc,char * argv[])723 void do_set_super(int argc, char *argv[])
724 {
725 const char *usage = "<field> <value>\n"
726 "\t\"set_super_value -l\" will list the names of "
727 "superblock fields\n\twhich can be set.";
728 static struct field_set_info *ss;
729
730 if ((argc == 2) && !strcmp(argv[1], "-l")) {
731 print_possible_fields(super_fields);
732 return;
733 }
734
735 if (common_args_process(argc, argv, 3, 3, "set_super_value",
736 usage, CHECK_FS_RW))
737 return;
738
739 if ((ss = find_field(super_fields, argv[1])) == 0) {
740 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
741 return;
742 }
743 set_sb = *current_fs->super;
744 if (ss->func(ss, argv[1], argv[2]) == 0) {
745 *current_fs->super = set_sb;
746 ext2fs_mark_super_dirty(current_fs);
747 }
748 }
749
do_set_inode(int argc,char * argv[])750 void do_set_inode(int argc, char *argv[])
751 {
752 const char *usage = "<inode> <field> <value>\n"
753 "\t\"set_inode_field -l\" will list the names of "
754 "the fields in an ext2 inode\n\twhich can be set.";
755 static struct field_set_info *ss;
756
757 if ((argc == 2) && !strcmp(argv[1], "-l")) {
758 print_possible_fields(inode_fields);
759 return;
760 }
761
762 if (common_args_process(argc, argv, 4, 4, "set_inode",
763 usage, CHECK_FS_RW))
764 return;
765
766 if ((ss = find_field(inode_fields, argv[2])) == 0) {
767 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
768 return;
769 }
770
771 set_ino = string_to_inode(argv[1]);
772 if (!set_ino)
773 return;
774
775 if (debugfs_read_inode_full(set_ino,
776 (struct ext2_inode *) &set_inode, argv[1],
777 sizeof(set_inode)))
778 return;
779
780 if (ss->func(ss, argv[2], argv[3]) == 0) {
781 if (debugfs_write_inode_full(set_ino,
782 (struct ext2_inode *) &set_inode,
783 argv[1], sizeof(set_inode)))
784 return;
785 }
786 }
787
do_set_block_group_descriptor(int argc,char * argv[])788 void do_set_block_group_descriptor(int argc, char *argv[])
789 {
790 const char *usage = "<bg number> <field> <value>\n"
791 "\t\"set_block_group_descriptor -l\" will list the names of "
792 "the fields in a block group descriptor\n\twhich can be set.";
793 struct field_set_info *table;
794 struct field_set_info *ss;
795 char *end;
796 void *edit, *target;
797 int size;
798
799 /*
800 * Determine whether we are editing an ext2 or ext4 block group
801 * descriptor. Descriptors larger than ext4_group_desc cannot
802 * have their fields edited yet, because they do not have any
803 * names assigned. When that happens, this function needs to
804 * be updated for the new descriptor struct and fields.
805 */
806 if (current_fs &&
807 EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) {
808 table = ext4_bg_fields;
809 edit = &set_gd4;
810 size = sizeof(set_gd4);
811 } else {
812 table = ext2_bg_fields;
813 edit = &set_gd;
814 size = sizeof(set_gd);
815 }
816
817 if ((argc == 2) && !strcmp(argv[1], "-l")) {
818 print_possible_fields(table);
819 return;
820 }
821
822 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
823 usage, CHECK_FS_RW))
824 return;
825
826 set_bg = strtoul(argv[1], &end, 0);
827 if (*end) {
828 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
829 return;
830 }
831
832 if (set_bg >= current_fs->group_desc_count) {
833 com_err(argv[0], 0, "block group number too big: %d", set_bg);
834 return;
835 }
836
837 if ((ss = find_field(table, argv[2])) == 0) {
838 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
839 return;
840 }
841
842 target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
843 memcpy(edit, target, size);
844 if (ss->func(ss, argv[2], argv[3]) == 0) {
845 memcpy(target, edit, size);
846 ext2fs_mark_super_dirty(current_fs);
847 }
848 }
849
parse_mmp_clear(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg EXT2FS_ATTR ((unused)))850 static errcode_t parse_mmp_clear(struct field_set_info *info,
851 char *field EXT2FS_ATTR((unused)),
852 char *arg EXT2FS_ATTR((unused)))
853 {
854 errcode_t retval;
855
856 retval = ext2fs_mmp_clear(current_fs);
857 if (retval != 0)
858 com_err("set_mmp_value", retval, "while clearing MMP block\n");
859 else
860 memcpy(info->ptr, current_fs->mmp_buf, info->size);
861
862 return 1; /* we don't need the MMP block written again */
863 }
864
865 #ifdef CONFIG_MMP
do_set_mmp_value(int argc,char * argv[])866 void do_set_mmp_value(int argc, char *argv[])
867 {
868 const char *usage = "<field> <value>\n"
869 "\t\"set_mmp_value -l\" will list the names of "
870 "MMP fields\n\twhich can be set.";
871 static struct field_set_info *smmp;
872 struct mmp_struct *mmp_s;
873 errcode_t retval;
874
875 if (argc == 2 && strcmp(argv[1], "-l") == 0) {
876 print_possible_fields(mmp_fields);
877 return;
878 }
879
880 if (check_fs_open(argv[0]))
881 return;
882
883 if (current_fs->super->s_mmp_block == 0) {
884 com_err(argv[0], 0, "no MMP block allocated\n");
885 return;
886 }
887
888 if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
889 usage, CHECK_FS_RW))
890 return;
891
892 mmp_s = current_fs->mmp_buf;
893 if (mmp_s == NULL) {
894 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
895 if (retval) {
896 com_err(argv[0], retval, "allocating MMP buffer\n");
897 return;
898 }
899 retval = ext2fs_mmp_read(current_fs,
900 current_fs->super->s_mmp_block, mmp_s);
901 if (retval) {
902 com_err(argv[0], retval, "reading MMP block %llu.\n",
903 (long long)current_fs->super->s_mmp_block);
904 ext2fs_free_mem(&mmp_s);
905 return;
906 }
907 current_fs->mmp_buf = mmp_s;
908 }
909
910 smmp = find_field(mmp_fields, argv[1]);
911 if (smmp == 0) {
912 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
913 return;
914 }
915
916 set_mmp = *mmp_s;
917 if (smmp->func(smmp, argv[1], argv[2]) == 0) {
918 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
919 &set_mmp);
920 *mmp_s = set_mmp;
921 }
922 }
923 #else
do_set_mmp_value(int argc EXT2FS_ATTR ((unused)),char * argv[]EXT2FS_ATTR ((unused)))924 void do_set_mmp_value(int argc EXT2FS_ATTR((unused)),
925 char *argv[] EXT2FS_ATTR((unused)))
926 {
927 fprintf(stdout, "MMP is unsupported, please recompile with "
928 "--enable-mmp\n");
929 }
930 #endif
931
932