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 { "min_extra_isize", &set_sb.s_min_extra_isize, 2, parse_uint },
128 { "want_extra_isize", &set_sb.s_want_extra_isize, 2, parse_uint },
129 { "flags", &set_sb.s_flags, 4, parse_uint },
130 { "raid_stride", &set_sb.s_raid_stride, 2, parse_uint },
131 { "min_extra_isize", &set_sb.s_min_extra_isize, 4, parse_uint },
132 { "mmp_interval", &set_sb.s_mmp_interval, 2, parse_uint },
133 { "mmp_block", &set_sb.s_mmp_block, 8, parse_uint },
134 { "raid_stripe_width", &set_sb.s_raid_stripe_width, 4, parse_uint },
135 { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, 1, parse_uint },
136 { "kbytes_written", &set_sb.s_kbytes_written, 8, parse_uint },
137 { "snapshot_inum", &set_sb.s_snapshot_inum, 4, parse_uint },
138 { "snapshot_id", &set_sb.s_snapshot_id, 4, parse_uint },
139 { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, 8,
141 { "snapshot_list", &set_sb.s_snapshot_list, 4, parse_uint },
142 { "mount_opts", &set_sb.s_mount_opts, 64, parse_string },
146 static struct field_set_info inode_fields[] = {
147 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
148 { "mode", &set_inode.i_mode, 2, parse_uint },
149 { "uid", &set_inode.i_uid, 2, parse_uint },
150 { "size", &set_inode.i_size, 4, parse_uint },
151 { "atime", &set_inode.i_atime, 4, parse_time },
152 { "ctime", &set_inode.i_ctime, 4, parse_time },
153 { "mtime", &set_inode.i_mtime, 4, parse_time },
154 { "dtime", &set_inode.i_dtime, 4, parse_time },
155 { "gid", &set_inode.i_gid, 2, parse_uint },
156 { "links_count", &set_inode.i_links_count, 2, parse_uint },
157 { "blocks", &set_inode.i_blocks, 4, parse_uint },
158 { "flags", &set_inode.i_flags, 4, parse_uint },
159 { "version", &set_inode.osd1.linux1.l_i_version, 4, parse_uint },
160 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
161 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY,
163 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
164 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
165 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
166 { "generation", &set_inode.i_generation, 4, parse_uint },
167 { "file_acl", &set_inode.i_file_acl, 4, parse_uint },
168 { "file_acl_high", &set_inode.osd2.linux2.l_i_file_acl_high, 2,
170 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
171 { "size_high", &set_inode.i_size_high, 4, parse_uint },
172 { "faddr", &set_inode.i_faddr, 4, parse_uint },
173 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint },
174 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint },
175 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint },
176 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
177 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
178 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
179 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
183 static struct field_set_info ext2_bg_fields[] = {
184 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint },
185 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint },
186 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint },
187 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint },
188 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
189 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
190 { "flags", &set_gd.bg_flags, 2, parse_uint },
191 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
192 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
193 { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum },
198 static struct field_set_info *find_field(struct field_set_info *fields,
201 struct field_set_info *ss;
203 char *arg, *delim, *idx, *tmp;
206 if (fields == super_fields)
208 else if (fields == inode_fields)
212 prefix_len = strlen(prefix);
213 if (strncmp(field, prefix, prefix_len) == 0)
216 arg = malloc(strlen(field)+1);
221 idx = strchr(arg, '[');
224 delim = idx + strlen(idx) - 1;
225 if (!*idx || *delim != ']')
231 * Can we parse the number?
234 array_idx = strtol(idx, &tmp, 0);
239 for (ss = fields ; ss->name ; ss++) {
240 if (ss->flags & FLAG_ARRAY) {
241 if (!idx || (strcmp(ss->name, arg) != 0))
243 if (ss->max_idx > 0 && array_idx >= ss->max_idx)
246 if (strcmp(ss->name, field) != 0)
256 static errcode_t parse_uint(struct field_set_info *info, char *arg)
258 unsigned long long num, limit;
267 u.ptr8 = (__u8 *) info->ptr;
268 if (info->flags & FLAG_ARRAY)
269 u.ptr8 += array_idx * info->size;
272 num = STRTOULL(arg, &tmp, 0);
274 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
278 limit = ~0ULL >> ((8 - info->size) * 8);
280 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
281 arg, info->name, limit);
284 switch (info->size) {
301 static errcode_t parse_int(struct field_set_info *info, char *arg)
309 num = strtol(arg, &tmp, 0);
311 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
315 switch (info->size) {
317 ptr32 = (__s32 *) info->ptr;
321 ptr16 = (__s16 *) info->ptr;
325 ptr8 = (__s8 *) info->ptr;
332 static errcode_t parse_string(struct field_set_info *info, char *arg)
334 char *cp = (char *) info->ptr;
336 if (strlen(arg) >= info->size) {
337 fprintf(stderr, "Error maximum size for %s is %d.\n",
338 info->name, info->size);
345 static errcode_t parse_time(struct field_set_info *info, char *arg)
350 ptr32 = (__u32 *) info->ptr;
352 t = string_to_time(arg);
354 if (t == ((time_t) -1)) {
355 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
363 static errcode_t parse_uuid(struct field_set_info *info, char *arg)
365 unsigned char * p = (unsigned char *) info->ptr;
367 if ((strcasecmp(arg, "null") == 0) ||
368 (strcasecmp(arg, "clear") == 0)) {
370 } else if (strcasecmp(arg, "time") == 0) {
371 uuid_generate_time(p);
372 } else if (strcasecmp(arg, "random") == 0) {
374 } else if (uuid_parse(arg, p)) {
375 fprintf(stderr, "Invalid UUID format: %s\n", arg);
381 static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
384 unsigned char *p = (unsigned char *) info->ptr;
386 hashv = e2p_string2hash(arg);
388 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
395 static errcode_t parse_bmap(struct field_set_info *info, char *arg)
402 num = strtoul(arg, &tmp, 0);
404 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
410 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET,
413 com_err("set_inode", retval, "while setting block map");
418 static errcode_t parse_gd_csum(struct field_set_info *info, char *arg)
421 if (strcmp(arg, "calc") == 0) {
422 ext2fs_group_desc_csum_set(current_fs, set_bg);
423 set_gd = current_fs->group_desc[set_bg];
424 printf("Checksum set to 0x%04x\n",
425 current_fs->group_desc[set_bg].bg_checksum);
429 return parse_uint(info, arg);
432 static void print_possible_fields(struct field_set_info *fields)
434 struct field_set_info *ss;
435 const char *type, *cmd;
437 char name[40], idx[40];
439 if (fields == super_fields) {
441 cmd = "set_super_value";
442 } else if (fields == inode_fields) {
446 type = "Block group descriptor";
447 cmd = "set_block_group";
451 fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
453 for (ss = fields ; ss->name ; ss++) {
455 if (ss->func == parse_string)
457 else if (ss->func == parse_int)
459 else if (ss->func == parse_uint)
460 type = "unsigned integer";
461 else if (ss->func == parse_uuid)
463 else if (ss->func == parse_hashalg)
464 type = "hash algorithm";
465 else if (ss->func == parse_time)
467 else if (ss->func == parse_bmap)
468 type = "set physical->logical block map";
469 strcpy(name, ss->name);
470 if (ss->flags & FLAG_ARRAY) {
472 sprintf(idx, "[%d]", ss->max_idx);
477 fprintf(f, "\t%-20s\t%s\n", name, type);
483 void do_set_super(int argc, char *argv[])
485 const char *usage = "<field> <value>\n"
486 "\t\"set_super_value -l\" will list the names of "
487 "superblock fields\n\twhich can be set.";
488 static struct field_set_info *ss;
490 if ((argc == 2) && !strcmp(argv[1], "-l")) {
491 print_possible_fields(super_fields);
495 if (common_args_process(argc, argv, 3, 3, "set_super_value",
499 if ((ss = find_field(super_fields, argv[1])) == 0) {
500 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
503 set_sb = *current_fs->super;
504 if (ss->func(ss, argv[2]) == 0) {
505 *current_fs->super = set_sb;
506 ext2fs_mark_super_dirty(current_fs);
510 void do_set_inode(int argc, char *argv[])
512 const char *usage = "<inode> <field> <value>\n"
513 "\t\"set_inode_field -l\" will list the names of "
514 "the fields in an ext2 inode\n\twhich can be set.";
515 static struct field_set_info *ss;
517 if ((argc == 2) && !strcmp(argv[1], "-l")) {
518 print_possible_fields(inode_fields);
522 if (common_args_process(argc, argv, 4, 4, "set_inode",
526 if ((ss = find_field(inode_fields, argv[2])) == 0) {
527 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
531 set_ino = string_to_inode(argv[1]);
535 if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
538 if (ss->func(ss, argv[3]) == 0) {
539 if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
544 void do_set_block_group_descriptor(int argc, char *argv[])
546 const char *usage = "<bg number> <field> <value>\n"
547 "\t\"set_block_group_descriptor -l\" will list the names of "
548 "the fields in a block group descriptor\n\twhich can be set.";
549 struct field_set_info *ss;
552 if ((argc == 2) && !strcmp(argv[1], "-l")) {
553 print_possible_fields(ext2_bg_fields);
557 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
561 set_bg = strtoul(argv[1], &end, 0);
563 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
567 if (set_bg >= current_fs->group_desc_count) {
568 com_err(argv[0], 0, "block group number too big: %d", set_bg);
573 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) {
574 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
578 set_gd = current_fs->group_desc[set_bg];
580 if (ss->func(ss, argv[3]) == 0) {
581 current_fs->group_desc[set_bg] = set_gd;
582 ext2fs_mark_super_dirty(current_fs);