2 * set_fields.c --- set a superblock value
4 * Copyright (C) 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Public
12 #define _XOPEN_SOURCE 600 /* for inclusion of strptime() and strtoull */
15 #define STRTOULL strtoull
17 #define STRTOULL strtoul
27 #include <sys/types.h>
39 #include "uuid/uuid.h"
42 static struct ext2_super_block set_sb;
43 static struct ext2_inode set_inode;
44 static struct ext2_group_desc set_gd;
46 static ext2_ino_t set_ino;
49 #define FLAG_ARRAY 0x0001
51 struct field_set_info {
55 errcode_t (*func)(struct field_set_info *info, char *arg);
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);
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 },
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,
107 { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
108 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
110 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2,
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,
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 { "free_blocks_hi", &set_sb.s_free_blocks_hi, 4, parse_uint },
128 { "min_extra_isize", &set_sb.s_min_extra_isize, 2, parse_uint },
129 { "want_extra_isize", &set_sb.s_want_extra_isize, 2, parse_uint },
130 { "flags", &set_sb.s_flags, 4, parse_uint },
131 { "raid_stride", &set_sb.s_raid_stride, 2, parse_uint },
132 { "min_extra_isize", &set_sb.s_min_extra_isize, 4, parse_uint },
133 { "mmp_interval", &set_sb.s_mmp_interval, 2, parse_uint },
134 { "mmp_block", &set_sb.s_mmp_block, 8, parse_uint },
135 { "raid_stripe_width", &set_sb.s_raid_stripe_width, 4, parse_uint },
136 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, 1, parse_uint },
137 { "kbytes_written", &set_sb.s_kbytes_written, 8, parse_uint },
141 static struct field_set_info inode_fields[] = {
142 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
143 { "mode", &set_inode.i_mode, 2, parse_uint },
144 { "uid", &set_inode.i_uid, 2, parse_uint },
145 { "size", &set_inode.i_size, 4, parse_uint },
146 { "atime", &set_inode.i_atime, 4, parse_time },
147 { "ctime", &set_inode.i_ctime, 4, parse_time },
148 { "mtime", &set_inode.i_mtime, 4, parse_time },
149 { "dtime", &set_inode.i_dtime, 4, parse_time },
150 { "gid", &set_inode.i_gid, 2, parse_uint },
151 { "links_count", &set_inode.i_links_count, 2, parse_uint },
152 { "blocks", &set_inode.i_blocks, 4, parse_uint },
153 { "flags", &set_inode.i_flags, 4, parse_uint },
154 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint },
155 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
156 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY,
158 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
159 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
160 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
161 { "generation", &set_inode.i_generation, 4, parse_uint },
162 { "file_acl", &set_inode.i_file_acl, 4, parse_uint },
163 { "file_acl_high", &set_inode.osd2.linux2.l_i_file_acl_high, 2,
165 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
166 { "size_high", &set_inode.i_size_high, 4, parse_uint },
167 { "faddr", &set_inode.i_faddr, 4, parse_uint },
168 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint },
169 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint },
170 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint },
171 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
172 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
173 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
174 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
178 static struct field_set_info ext2_bg_fields[] = {
179 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint },
180 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint },
181 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint },
182 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint },
183 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
184 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
185 { "flags", &set_gd.bg_flags, 2, parse_uint },
186 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
187 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
188 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum },
193 static struct field_set_info *find_field(struct field_set_info *fields,
196 struct field_set_info *ss;
198 char *arg, *delim, *idx, *tmp;
201 if (fields == super_fields)
203 else if (fields == inode_fields)
207 prefix_len = strlen(prefix);
208 if (strncmp(field, prefix, prefix_len) == 0)
211 arg = malloc(strlen(field)+1);
216 idx = strchr(arg, '[');
219 delim = idx + strlen(idx) - 1;
220 if (!*idx || *delim != ']')
226 * Can we parse the number?
229 array_idx = strtol(idx, &tmp, 0);
234 for (ss = fields ; ss->name ; ss++) {
235 if (ss->flags & FLAG_ARRAY) {
236 if (!idx || (strcmp(ss->name, arg) != 0))
238 if (ss->max_idx > 0 && array_idx >= ss->max_idx)
241 if (strcmp(ss->name, field) != 0)
251 static errcode_t parse_uint(struct field_set_info *info, char *arg)
253 unsigned long long num, limit;
262 u.ptr8 = (__u8 *) info->ptr;
263 if (info->flags & FLAG_ARRAY)
264 u.ptr8 += array_idx * info->size;
267 num = STRTOULL(arg, &tmp, 0);
269 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
273 limit = ~0ULL >> ((8 - info->size) * 8);
275 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
276 arg, info->name, limit);
279 switch (info->size) {
296 static errcode_t parse_int(struct field_set_info *info, char *arg)
304 num = strtol(arg, &tmp, 0);
306 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
310 switch (info->size) {
312 ptr32 = (__s32 *) info->ptr;
316 ptr16 = (__s16 *) info->ptr;
320 ptr8 = (__s8 *) info->ptr;
327 static errcode_t parse_string(struct field_set_info *info, char *arg)
329 char *cp = (char *) info->ptr;
331 if (strlen(arg) >= info->size) {
332 fprintf(stderr, "Error maximum size for %s is %d.\n",
333 info->name, info->size);
340 static errcode_t parse_time(struct field_set_info *info, char *arg)
345 ptr32 = (__u32 *) info->ptr;
347 t = string_to_time(arg);
349 if (t == ((time_t) -1)) {
350 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
358 static errcode_t parse_uuid(struct field_set_info *info, char *arg)
360 unsigned char * p = (unsigned char *) info->ptr;
362 if ((strcasecmp(arg, "null") == 0) ||
363 (strcasecmp(arg, "clear") == 0)) {
365 } else if (strcasecmp(arg, "time") == 0) {
366 uuid_generate_time(p);
367 } else if (strcasecmp(arg, "random") == 0) {
369 } else if (uuid_parse(arg, p)) {
370 fprintf(stderr, "Invalid UUID format: %s\n", arg);
376 static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
379 unsigned char *p = (unsigned char *) info->ptr;
381 hashv = e2p_string2hash(arg);
383 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
390 static errcode_t parse_bmap(struct field_set_info *info, char *arg)
397 num = strtoul(arg, &tmp, 0);
399 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
405 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET,
408 com_err("set_inode", retval, "while setting block map");
413 static errcode_t parse_gd_csum(struct field_set_info *info, char *arg)
416 if (strcmp(arg, "calc") == 0) {
417 ext2fs_group_desc_csum_set(current_fs, set_bg);
418 memcpy(&set_gd, ext2fs_group_desc(current_fs,
419 current_fs->group_desc,
422 printf("Checksum set to 0x%04x\n",
423 ext2fs_bg_checksum(current_fs, set_bg));
427 return parse_uint(info, arg);
430 static void print_possible_fields(struct field_set_info *fields)
432 struct field_set_info *ss;
433 const char *type, *cmd;
435 char name[40], idx[40];
437 if (fields == super_fields) {
439 cmd = "set_super_value";
440 } else if (fields == inode_fields) {
444 type = "Block group descriptor";
445 cmd = "set_block_group";
449 fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
451 for (ss = fields ; ss->name ; ss++) {
453 if (ss->func == parse_string)
455 else if (ss->func == parse_int)
457 else if (ss->func == parse_uint)
458 type = "unsigned integer";
459 else if (ss->func == parse_uuid)
461 else if (ss->func == parse_hashalg)
462 type = "hash algorithm";
463 else if (ss->func == parse_time)
465 else if (ss->func == parse_bmap)
466 type = "set physical->logical block map";
467 strcpy(name, ss->name);
468 if (ss->flags & FLAG_ARRAY) {
470 sprintf(idx, "[%d]", ss->max_idx);
475 fprintf(f, "\t%-20s\t%s\n", name, type);
481 void do_set_super(int argc, char *argv[])
483 const char *usage = "<field> <value>\n"
484 "\t\"set_super_value -l\" will list the names of "
485 "superblock fields\n\twhich can be set.";
486 static struct field_set_info *ss;
488 if ((argc == 2) && !strcmp(argv[1], "-l")) {
489 print_possible_fields(super_fields);
493 if (common_args_process(argc, argv, 3, 3, "set_super_value",
497 if ((ss = find_field(super_fields, argv[1])) == 0) {
498 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
501 set_sb = *current_fs->super;
502 if (ss->func(ss, argv[2]) == 0) {
503 *current_fs->super = set_sb;
504 ext2fs_mark_super_dirty(current_fs);
508 void do_set_inode(int argc, char *argv[])
510 const char *usage = "<inode> <field> <value>\n"
511 "\t\"set_inode_field -l\" will list the names of "
512 "the fields in an ext2 inode\n\twhich can be set.";
513 static struct field_set_info *ss;
515 if ((argc == 2) && !strcmp(argv[1], "-l")) {
516 print_possible_fields(inode_fields);
520 if (common_args_process(argc, argv, 4, 4, "set_inode",
524 if ((ss = find_field(inode_fields, argv[2])) == 0) {
525 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
529 set_ino = string_to_inode(argv[1]);
533 if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
536 if (ss->func(ss, argv[3]) == 0) {
537 if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
542 void do_set_block_group_descriptor(int argc, char *argv[])
544 const char *usage = "<bg number> <field> <value>\n"
545 "\t\"set_block_group_descriptor -l\" will list the names of "
546 "the fields in a block group descriptor\n\twhich can be set.";
547 struct field_set_info *ss;
550 if ((argc == 2) && !strcmp(argv[1], "-l")) {
551 print_possible_fields(ext2_bg_fields);
555 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
559 set_bg = strtoul(argv[1], &end, 0);
561 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
565 if (set_bg >= current_fs->group_desc_count) {
566 com_err(argv[0], 0, "block group number too big: %d", set_bg);
571 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) {
572 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
576 memcpy(&set_gd, ext2fs_group_desc(current_fs,
577 current_fs->group_desc, set_bg),
580 if (ss->func(ss, argv[3]) == 0) {
581 memcpy(ext2fs_group_desc(current_fs,
582 current_fs->group_desc, set_bg),
583 &set_gd, sizeof(set_gd));
584 ext2fs_mark_super_dirty(current_fs);