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 #if __GNUC_PREREQ (4, 6) || defined(__clang__)
79 #pragma GCC diagnostic push
80 #pragma GCC diagnostic ignored "-Wmissing-field-initializers"
81 #endif
82
83 static struct field_set_info super_fields[] = {
84 { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
85 { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi,
86 4, parse_uint },
87 { "r_blocks_count", &set_sb.s_r_blocks_count,
88 &set_sb.s_r_blocks_count_hi, 4, parse_uint },
89 { "free_blocks_count", &set_sb.s_free_blocks_count,
90 &set_sb.s_free_blocks_hi, 4, parse_uint },
91 { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint },
92 { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint },
93 { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint },
94 { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int },
95 { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint },
96 { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint },
97 { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint },
98 { "mtime", &set_sb.s_mtime, NULL, 4, parse_time },
99 { "wtime", &set_sb.s_wtime, NULL, 4, parse_time },
100 { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint },
101 { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int },
102 /* s_magic */
103 { "state", &set_sb.s_state, NULL, 2, parse_uint },
104 { "errors", &set_sb.s_errors, NULL, 2, parse_uint },
105 { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint },
106 { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time },
107 { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint },
108 { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint },
109 { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint },
110 { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint },
111 { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint },
112 { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint },
113 { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint },
114 { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint },
115 { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint },
116 { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint },
117 { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint },
118 { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid },
119 { "volume_name", &set_sb.s_volume_name, NULL, 16, parse_string },
120 { "last_mounted", &set_sb.s_last_mounted, NULL, 64, parse_string },
121 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL,
122 4, parse_uint },
123 { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint },
124 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1,
125 parse_uint },
126 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2,
127 parse_uint },
128 { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid },
129 { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint },
130 { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint },
131 { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint },
132 { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid },
133 { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg },
134 { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint },
135 { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint },
136 { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint },
137 { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint },
138 { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time },
139 { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY,
140 17 },
141 { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint },
142 { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint },
143 { "flags", &set_sb.s_flags, NULL, 4, parse_uint },
144 { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint },
145 { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint },
146 { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint },
147 { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint },
148 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint },
149 { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint },
150 { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint },
151 { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint },
152 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count,
153 NULL, 8, parse_uint },
154 { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint },
155 { "mount_opts", &set_sb.s_mount_opts, NULL, 64, parse_string },
156 { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint },
157 { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint },
158 { "prj_quota_inum", &set_sb.s_prj_quota_inum, NULL, 4, parse_uint },
159 { "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint },
160 { "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint,
161 FLAG_ARRAY, 2 },
162 { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
163 { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint },
164 { "encryption_level", &set_sb.s_encryption_level, NULL, 1, parse_uint },
165 { "error_count", &set_sb.s_error_count, NULL, 4, parse_uint },
166 { "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time },
167 { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
168 { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint },
169 { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string },
170 { "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint },
171 { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time },
172 { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
173 { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint },
174 { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string },
175 { "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint },
176 { "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint,
177 FLAG_ARRAY, 4 },
178 { "encrypt_pw_salt", &set_sb.s_encrypt_pw_salt, NULL, 16, parse_uuid },
179 { "lpf_ino", &set_sb.s_lpf_ino, NULL, 4, parse_uint },
180 { "checksum_seed", &set_sb.s_checksum_seed, NULL, 4, parse_uint },
181 { 0, 0, 0, 0 }
182 };
183
184 static struct field_set_info inode_fields[] = {
185 { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
186 { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
187 2, parse_uint },
188 { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
189 { "atime", &set_inode.i_atime, &set_inode.i_atime_extra,
190 4, parse_time },
191 { "ctime", &set_inode.i_ctime, &set_inode.i_ctime_extra,
192 4, parse_time },
193 { "mtime", &set_inode.i_mtime, &set_inode.i_mtime_extra,
194 4, parse_time },
195 { "dtime", &set_inode.i_dtime, NULL,
196 4, parse_time },
197 { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
198 2, parse_uint },
199 { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
200 /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
201 { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
202 6, parse_uint },
203 { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
204 { "version", &set_inode.osd1.linux1.l_i_version,
205 &set_inode.i_version_hi, 4, parse_uint },
206 { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL,
207 4, parse_uint, FLAG_ALIAS },
208 { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
209 EXT2_NDIR_BLOCKS },
210 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
211 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
212 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
213 { "generation", &set_inode.i_generation, NULL, 4, parse_uint },
214 /* Special case: i_file_acl_high is 2 bytes */
215 { "file_acl", &set_inode.i_file_acl,
216 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
217 { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
218 { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS },
219 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
220 { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
221 &set_inode.i_checksum_hi, 2, parse_uint },
222 { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
223 4, parse_uint, FLAG_ALIAS },
224 { "extra_isize", &set_inode.i_extra_isize, NULL,
225 2, parse_uint },
226 { "ctime_extra", &set_inode.i_ctime_extra, NULL,
227 4, parse_uint, FLAG_ALIAS },
228 { "mtime_extra", &set_inode.i_mtime_extra, NULL,
229 4, parse_uint, FLAG_ALIAS },
230 { "atime_extra", &set_inode.i_atime_extra, NULL,
231 4, parse_uint, FLAG_ALIAS },
232 { "crtime", &set_inode.i_crtime, &set_inode.i_crtime_extra,
233 4, parse_time },
234 { "crtime_extra", &set_inode.i_crtime_extra, NULL,
235 4, parse_uint, FLAG_ALIAS },
236 { "projid", &set_inode.i_projid, NULL, 4, parse_uint },
237 { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
238 { 0, 0, 0, 0 }
239 };
240
241 static struct field_set_info ext2_bg_fields[] = {
242 { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
243 { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
244 { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
245 { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
246 { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
247 { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
248 { "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
249 { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
250 { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
251 { 0, 0, 0, 0 }
252 };
253
254 static struct field_set_info ext4_bg_fields[] = {
255 { "block_bitmap", &set_gd4.bg_block_bitmap,
256 &set_gd4.bg_block_bitmap_hi, 4, parse_uint },
257 { "inode_bitmap", &set_gd4.bg_inode_bitmap,
258 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
259 { "inode_table", &set_gd4.bg_inode_table,
260 &set_gd4.bg_inode_table_hi, 4, parse_uint },
261 { "free_blocks_count", &set_gd4.bg_free_blocks_count,
262 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
263 { "free_inodes_count", &set_gd4.bg_free_inodes_count,
264 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
265 { "used_dirs_count", &set_gd4.bg_used_dirs_count,
266 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
267 { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
268 { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
269 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
270 { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
271 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
272 { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
273 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
274 { "itable_unused", &set_gd4.bg_itable_unused,
275 &set_gd4.bg_itable_unused_hi, 2, parse_uint },
276 { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
277 { 0, 0, 0, 0 }
278 };
279
280 static struct field_set_info mmp_fields[] = {
281 { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp),
282 parse_mmp_clear, FLAG_ALIAS },
283 { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
284 { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
285 { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
286 { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
287 parse_string },
288 { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
289 parse_string },
290 { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
291 { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
292 { 0, 0, 0, 0 }
293 };
294 #if __GNUC_PREREQ (4, 6)
295 #pragma GCC diagnostic pop
296 #endif
297
298 #ifdef UNITTEST
299
300
do_verify_field_set_info(struct field_set_info * fields,const void * data,size_t size)301 static void do_verify_field_set_info(struct field_set_info *fields,
302 const void *data, size_t size)
303 {
304 struct field_set_info *ss, *ss2;
305 const char *begin = (char *)data;
306 const char *end = begin + size;
307
308 for (ss = fields ; ss->name ; ss++) {
309 const char *ptr;
310
311 /* Check pointers */
312 ptr = ss->ptr;
313 assert(!ptr || (ptr >= begin && ptr < end));
314 ptr = ss->ptr2;
315 assert(!ptr || (ptr >= begin && ptr < end));
316
317 /* Check function */
318 assert(ss->func);
319
320 for (ss2 = fields ; ss2 != ss ; ss2++) {
321 /* Check duplicate names */
322 assert(strcmp(ss->name, ss2->name));
323
324 if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS)
325 continue;
326 /* Check false aliases, might be copy-n-paste error */
327 assert(!ss->ptr || (ss->ptr != ss2->ptr &&
328 ss->ptr != ss2->ptr2));
329 assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr &&
330 ss->ptr2 != ss2->ptr2));
331 }
332 }
333 }
334
main(int argc,char ** argv)335 int main(int argc, char **argv)
336 {
337 do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb));
338 do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode));
339 do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd));
340 do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4));
341 do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp));
342 return 0;
343 }
344
345 ext2_filsys current_fs;
346 ext2_ino_t root, cwd;
347
348 #endif /* UNITTEST */
349
check_suffix(const char * field)350 static int check_suffix(const char *field)
351 {
352 int len = strlen(field);
353
354 if (len <= 3)
355 return 0;
356 field += len-3;
357 if (!strcmp(field, "_lo"))
358 return 1;
359 if (!strcmp(field, "_hi"))
360 return 2;
361 return 0;
362 }
363
find_field(struct field_set_info * fields,char * field)364 static struct field_set_info *find_field(struct field_set_info *fields,
365 char *field)
366 {
367 struct field_set_info *ss;
368 const char *prefix;
369 char *arg, *delim, *idx, *tmp;
370 int suffix, prefix_len;
371
372 if (fields == super_fields)
373 prefix = "s_";
374 else if (fields == inode_fields)
375 prefix = "i_";
376 else
377 prefix = "bg_";
378 prefix_len = strlen(prefix);
379 if (strncmp(field, prefix, prefix_len) == 0)
380 field += prefix_len;
381
382 arg = malloc(strlen(field)+1);
383 if (!arg)
384 return NULL;
385 strcpy(arg, field);
386
387 idx = strchr(arg, '[');
388 if (idx) {
389 *idx++ = 0;
390 delim = idx + strlen(idx) - 1;
391 if (!*idx || *delim != ']')
392 idx = 0;
393 else
394 *delim = 0;
395 }
396 /*
397 * Can we parse the number?
398 */
399 if (idx) {
400 array_idx = strtol(idx, &tmp, 0);
401 if (*tmp) {
402 *(--idx) = '[';
403 *delim = ']';
404 idx = 0;
405 }
406 }
407
408 /*
409 * If there is a valid _hi or a _lo suffix, strip it off
410 */
411 suffix = check_suffix(arg);
412 if (suffix > 0)
413 arg[strlen(arg)-3] = 0;
414
415 for (ss = fields ; ss->name ; ss++) {
416 if (suffix && ss->ptr2 == 0)
417 continue;
418 if (ss->flags & FLAG_ARRAY) {
419 if (!idx || (strcmp(ss->name, arg) != 0))
420 continue;
421 if (ss->max_idx > 0 && array_idx >= ss->max_idx)
422 continue;
423 } else {
424 if (strcmp(ss->name, arg) != 0)
425 continue;
426 }
427 free(arg);
428 return ss;
429 }
430 free(arg);
431 return NULL;
432 }
433
434 /*
435 * Note: info->size == 6 is special; this means a base size 4 bytes,
436 * and secondary (high) size of 2 bytes. This is needed for the
437 * special case of i_blocks_high and i_file_acl_high.
438 */
parse_uint(struct field_set_info * info,char * field,char * arg)439 static errcode_t parse_uint(struct field_set_info *info, char *field,
440 char *arg)
441 {
442 unsigned long long n, num, mask, limit;
443 int suffix = check_suffix(field);
444 char *tmp;
445 void *field1 = info->ptr, *field2 = info->ptr2;
446 int size = (info->size == 6) ? 4 : info->size;
447 union {
448 __u64 *ptr64;
449 __u32 *ptr32;
450 __u16 *ptr16;
451 __u8 *ptr8;
452 } u;
453
454 if (suffix == 1)
455 field2 = 0;
456 if (suffix == 2) {
457 field1 = field2;
458 field2 = 0;
459 }
460
461 u.ptr8 = (__u8 *) field1;
462 if (info->flags & FLAG_ARRAY)
463 u.ptr8 += array_idx * info->size;
464
465 errno = 0;
466 num = STRTOULL(arg, &tmp, 0);
467 if (*tmp || errno) {
468 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
469 arg, info->name);
470 return EINVAL;
471 }
472 mask = ~0ULL >> ((8 - size) * 8);
473 limit = ~0ULL >> ((8 - info->size) * 8);
474 if (field2 && info->size != 6)
475 limit = ~0ULL >> ((8 - info->size*2) * 8);
476
477 if (num > limit) {
478 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
479 arg, info->name, limit);
480 return EINVAL;
481 }
482 n = num & mask;
483 switch (size) {
484 case 8:
485 /* Should never get here */
486 fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
487 "defined; BUG?!?\n", info->name);
488 *u.ptr64 = 0;
489 break;
490 case 4:
491 *u.ptr32 = n;
492 break;
493 case 2:
494 *u.ptr16 = n;
495 break;
496 case 1:
497 *u.ptr8 = n;
498 break;
499 }
500 if (!field2)
501 return 0;
502 n = (size == 8) ? 0 : (num >> (size*8));
503 u.ptr8 = (__u8 *) field2;
504 if (info->size == 6)
505 size = 2;
506 switch (size) {
507 case 8:
508 *u.ptr64 = n;
509 break;
510 case 4:
511 *u.ptr32 = n;
512 break;
513 case 2:
514 *u.ptr16 = n;
515 break;
516 case 1:
517 *u.ptr8 = n;
518 break;
519 }
520 return 0;
521 }
522
parse_int(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)523 static errcode_t parse_int(struct field_set_info *info,
524 char *field EXT2FS_ATTR((unused)), char *arg)
525 {
526 long num;
527 char *tmp;
528 __s32 *ptr32;
529 __s16 *ptr16;
530 __s8 *ptr8;
531
532 num = strtol(arg, &tmp, 0);
533 if (*tmp) {
534 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
535 arg, info->name);
536 return EINVAL;
537 }
538 switch (info->size) {
539 case 4:
540 ptr32 = (__s32 *) info->ptr;
541 *ptr32 = num;
542 break;
543 case 2:
544 ptr16 = (__s16 *) info->ptr;
545 *ptr16 = num;
546 break;
547 case 1:
548 ptr8 = (__s8 *) info->ptr;
549 *ptr8 = num;
550 break;
551 }
552 return 0;
553 }
554
parse_string(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)555 static errcode_t parse_string(struct field_set_info *info,
556 char *field EXT2FS_ATTR((unused)), char *arg)
557 {
558 char *cp = (char *) info->ptr;
559
560 if (strlen(arg) >= info->size) {
561 fprintf(stderr, "Error maximum size for %s is %d.\n",
562 info->name, info->size);
563 return EINVAL;
564 }
565 strcpy(cp, arg);
566 return 0;
567 }
568
parse_time(struct field_set_info * info,char * field,char * arg)569 static errcode_t parse_time(struct field_set_info *info,
570 char *field, char *arg)
571 {
572 __s64 t;
573 __u32 t_low, t_high;
574 __u32 *ptr_low, *ptr_high;
575
576 if (check_suffix(field))
577 return parse_uint(info, field, arg);
578
579 ptr_low = (__u32 *) info->ptr;
580 ptr_high = (__u32 *) info->ptr2;
581
582 t = string_to_time(arg);
583
584 if (t == -1) {
585 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
586 arg, info->name);
587 return EINVAL;
588 }
589 t_low = (__u32) t;
590 t_high = ((t - (__s32)t) >> 32) & EXT4_EPOCH_MASK;
591 *ptr_low = t_low;
592 if (ptr_high)
593 *ptr_high = (*ptr_high & ~EXT4_EPOCH_MASK) | t_high;
594 return 0;
595 }
596
parse_uuid(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)597 static errcode_t parse_uuid(struct field_set_info *info,
598 char *field EXT2FS_ATTR((unused)), char *arg)
599 {
600 unsigned char * p = (unsigned char *) info->ptr;
601
602 if ((strcasecmp(arg, "null") == 0) ||
603 (strcasecmp(arg, "clear") == 0)) {
604 uuid_clear(p);
605 } else if (strcasecmp(arg, "time") == 0) {
606 uuid_generate_time(p);
607 } else if (strcasecmp(arg, "random") == 0) {
608 uuid_generate(p);
609 } else if (uuid_parse(arg, p)) {
610 fprintf(stderr, "Invalid UUID format: %s\n", arg);
611 return EINVAL;
612 }
613 return 0;
614 }
615
parse_hashalg(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)616 static errcode_t parse_hashalg(struct field_set_info *info,
617 char *field EXT2FS_ATTR((unused)), char *arg)
618 {
619 int hashv;
620 unsigned char *p = (unsigned char *) info->ptr;
621
622 hashv = e2p_string2hash(arg);
623 if (hashv < 0) {
624 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
625 return EINVAL;
626 }
627 *p = hashv;
628 return 0;
629 }
630
parse_bmap(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg)631 static errcode_t parse_bmap(struct field_set_info *info,
632 char *field EXT2FS_ATTR((unused)), char *arg)
633 {
634 blk64_t blk;
635 errcode_t retval;
636 char *tmp;
637
638 blk = strtoull(arg, &tmp, 0);
639 if (*tmp) {
640 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
641 arg, info->name);
642 return EINVAL;
643 }
644
645 retval = ext2fs_bmap2(current_fs, set_ino,
646 (struct ext2_inode *) &set_inode,
647 NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL,
648 &blk);
649 if (retval) {
650 com_err("set_inode", retval, "while setting block map");
651 }
652 return retval;
653 }
654
parse_gd_csum(struct field_set_info * info,char * field,char * arg)655 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
656 char *arg)
657 {
658 __u16 *checksum = info->ptr;
659
660 if (strcmp(arg, "calc") == 0) {
661 *checksum = ext2fs_group_desc_csum(current_fs, set_bg);
662 printf("Checksum set to 0x%04x\n", *checksum);
663 return 0;
664 }
665 return parse_uint(info, field, arg);
666 }
667
print_possible_fields(struct field_set_info * fields)668 static void print_possible_fields(struct field_set_info *fields)
669 {
670 struct field_set_info *ss;
671 const char *type, *cmd;
672 FILE *f;
673 char name[40], idx[40];
674
675 if (fields == super_fields) {
676 type = "Superblock";
677 cmd = "set_super_value";
678 } else if (fields == inode_fields) {
679 type = "Inode";
680 cmd = "set_inode";
681 } else if (fields == mmp_fields) {
682 type = "MMP";
683 cmd = "set_mmp_value";
684 } else {
685 type = "Block group descriptor";
686 cmd = "set_block_group";
687 }
688 f = open_pager();
689
690 fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
691
692 for (ss = fields ; ss->name ; ss++) {
693 type = "unknown";
694 if (ss->func == parse_string)
695 type = "string";
696 else if (ss->func == parse_int)
697 type = "integer";
698 else if (ss->func == parse_uint)
699 type = "unsigned integer";
700 else if (ss->func == parse_uuid)
701 type = "UUID";
702 else if (ss->func == parse_hashalg)
703 type = "hash algorithm";
704 else if (ss->func == parse_time)
705 type = "date/time";
706 else if (ss->func == parse_bmap)
707 type = "set physical->logical block map";
708 else if (ss->func == parse_gd_csum)
709 type = "unsigned integer OR \"calc\"";
710 strcpy(name, ss->name);
711 if (ss->flags & FLAG_ARRAY) {
712 if (ss->max_idx > 0)
713 sprintf(idx, "[%d]", ss->max_idx);
714 else
715 strcpy(idx, "[]");
716 strcat(name, idx);
717 }
718 if (ss->ptr2)
719 strcat(name, "[_hi|_lo]");
720 fprintf(f, "\t%-25s\t%s\n", name, type);
721 }
722 close_pager(f);
723 }
724
725
do_set_super(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))726 void do_set_super(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
727 void *infop EXT2FS_ATTR((unused)))
728 {
729 const char *usage = "<field> <value>\n"
730 "\t\"set_super_value -l\" will list the names of "
731 "superblock fields\n\twhich can be set.";
732 static struct field_set_info *ss;
733
734 if ((argc == 2) && !strcmp(argv[1], "-l")) {
735 print_possible_fields(super_fields);
736 return;
737 }
738
739 if (common_args_process(argc, argv, 3, 3, "set_super_value",
740 usage, CHECK_FS_RW))
741 return;
742
743 if ((ss = find_field(super_fields, argv[1])) == 0) {
744 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
745 return;
746 }
747 set_sb = *current_fs->super;
748 if (ss->func(ss, argv[1], argv[2]) == 0) {
749 *current_fs->super = set_sb;
750 ext2fs_mark_super_dirty(current_fs);
751 }
752 }
753
do_set_inode(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))754 void do_set_inode(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
755 void *infop EXT2FS_ATTR((unused)))
756 {
757 const char *usage = "<inode> <field> <value>\n"
758 "\t\"set_inode_field -l\" will list the names of "
759 "the fields in an ext2 inode\n\twhich can be set.";
760 static struct field_set_info *ss;
761
762 if ((argc == 2) && !strcmp(argv[1], "-l")) {
763 print_possible_fields(inode_fields);
764 return;
765 }
766
767 if (common_args_process(argc, argv, 4, 4, "set_inode",
768 usage, CHECK_FS_RW))
769 return;
770
771 if ((ss = find_field(inode_fields, argv[2])) == 0) {
772 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
773 return;
774 }
775
776 set_ino = string_to_inode(argv[1]);
777 if (!set_ino)
778 return;
779
780 if (debugfs_read_inode_full(set_ino,
781 (struct ext2_inode *) &set_inode, argv[1],
782 sizeof(set_inode)))
783 return;
784
785 if (ss->func(ss, argv[2], argv[3]) == 0) {
786 if (debugfs_write_inode_full(set_ino,
787 (struct ext2_inode *) &set_inode,
788 argv[1], sizeof(set_inode)))
789 return;
790 }
791 }
792
do_set_block_group_descriptor(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))793 void do_set_block_group_descriptor(int argc, char *argv[],
794 int sci_idx EXT2FS_ATTR((unused)),
795 void *infop EXT2FS_ATTR((unused)))
796 {
797 const char *usage = "<bg number> <field> <value>\n"
798 "\t\"set_block_group -l\" will list the names of "
799 "the fields in a block group descriptor\n\twhich can be set.";
800 struct field_set_info *table;
801 struct field_set_info *ss;
802 char *end;
803 void *edit, *target;
804 int size;
805
806 /*
807 * Determine whether we are editing an ext2 or ext4 block group
808 * descriptor. Descriptors larger than ext4_group_desc cannot
809 * have their fields edited yet, because they do not have any
810 * names assigned. When that happens, this function needs to
811 * be updated for the new descriptor struct and fields.
812 */
813 if (current_fs &&
814 EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) {
815 table = ext4_bg_fields;
816 edit = &set_gd4;
817 size = sizeof(set_gd4);
818 } else {
819 table = ext2_bg_fields;
820 edit = &set_gd;
821 size = sizeof(set_gd);
822 }
823
824 if ((argc == 2) && !strcmp(argv[1], "-l")) {
825 print_possible_fields(table);
826 return;
827 }
828
829 if (common_args_process(argc, argv, 4, 4, "set_block_group",
830 usage, CHECK_FS_RW))
831 return;
832
833 set_bg = strtoul(argv[1], &end, 0);
834 if (*end) {
835 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
836 return;
837 }
838
839 if (set_bg >= current_fs->group_desc_count) {
840 com_err(argv[0], 0, "block group number too big: %d", set_bg);
841 return;
842 }
843
844 if ((ss = find_field(table, argv[2])) == 0) {
845 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
846 return;
847 }
848
849 target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
850 memcpy(edit, target, size);
851 if (ss->func(ss, argv[2], argv[3]) == 0) {
852 memcpy(target, edit, size);
853 ext2fs_mark_super_dirty(current_fs);
854 }
855 }
856
parse_mmp_clear(struct field_set_info * info,char * field EXT2FS_ATTR ((unused)),char * arg EXT2FS_ATTR ((unused)))857 static errcode_t parse_mmp_clear(struct field_set_info *info,
858 char *field EXT2FS_ATTR((unused)),
859 char *arg EXT2FS_ATTR((unused)))
860 {
861 errcode_t retval;
862
863 retval = ext2fs_mmp_clear(current_fs);
864 if (retval != 0)
865 com_err("set_mmp_value", retval, "while clearing MMP block\n");
866 else
867 memcpy(info->ptr, current_fs->mmp_buf, info->size);
868
869 return 1; /* we don't need the MMP block written again */
870 }
871
872 #ifdef CONFIG_MMP
do_set_mmp_value(int argc,char * argv[],int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))873 void do_set_mmp_value(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
874 void *infop EXT2FS_ATTR((unused)))
875 {
876 const char *usage = "<field> <value>\n"
877 "\t\"set_mmp_value -l\" will list the names of "
878 "MMP fields\n\twhich can be set.";
879 static struct field_set_info *smmp;
880 struct mmp_struct *mmp_s;
881 errcode_t retval;
882
883 if (argc == 2 && strcmp(argv[1], "-l") == 0) {
884 print_possible_fields(mmp_fields);
885 return;
886 }
887
888 if (check_fs_open(argv[0]))
889 return;
890
891 if (current_fs->super->s_mmp_block == 0) {
892 com_err(argv[0], 0, "no MMP block allocated\n");
893 return;
894 }
895
896 if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
897 usage, CHECK_FS_RW))
898 return;
899
900 mmp_s = current_fs->mmp_buf;
901 if (mmp_s == NULL) {
902 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
903 if (retval) {
904 com_err(argv[0], retval, "allocating MMP buffer\n");
905 return;
906 }
907 retval = ext2fs_mmp_read(current_fs,
908 current_fs->super->s_mmp_block, mmp_s);
909 if (retval) {
910 com_err(argv[0], retval, "reading MMP block %llu.\n",
911 (long long)current_fs->super->s_mmp_block);
912 ext2fs_free_mem(&mmp_s);
913 return;
914 }
915 current_fs->mmp_buf = mmp_s;
916 }
917
918 smmp = find_field(mmp_fields, argv[1]);
919 if (smmp == 0) {
920 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
921 return;
922 }
923
924 set_mmp = *mmp_s;
925 if (smmp->func(smmp, argv[1], argv[2]) == 0) {
926 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
927 &set_mmp);
928 *mmp_s = set_mmp;
929 }
930 }
931 #else
do_set_mmp_value(int argc EXT2FS_ATTR ((unused)),char * argv[]EXT2FS_ATTR ((unused)),int sci_idx EXT2FS_ATTR ((unused)),void * infop EXT2FS_ATTR ((unused)))932 void do_set_mmp_value(int argc EXT2FS_ATTR((unused)),
933 char *argv[] EXT2FS_ATTR((unused)),
934 int sci_idx EXT2FS_ATTR((unused)),
935 void *infop EXT2FS_ATTR((unused)))
936 {
937 fprintf(stdout, "MMP is unsupported, please recompile with "
938 "--enable-mmp\n");
939 }
940 #endif
941
942