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 500 /* for inclusion of strptime() */
20 #include <sys/types.h>
29 #include "uuid/uuid.h"
32 static struct ext2_super_block set_sb;
33 static struct ext2_inode set_inode;
34 static struct ext2_group_desc set_gd;
35 static ext2_ino_t set_ino;
38 #define FLAG_ARRAY 0x0001
40 struct field_set_info {
44 errcode_t (*func)(struct field_set_info *info, char *arg);
49 static errcode_t parse_uint(struct field_set_info *info, char *arg);
50 static errcode_t parse_int(struct field_set_info *info, char *arg);
51 static errcode_t parse_string(struct field_set_info *info, char *arg);
52 static errcode_t parse_uuid(struct field_set_info *info, char *arg);
53 static errcode_t parse_hashalg(struct field_set_info *info, char *arg);
54 static errcode_t parse_time(struct field_set_info *info, char *arg);
55 static errcode_t parse_bmap(struct field_set_info *info, char *arg);
57 static struct field_set_info super_fields[] = {
58 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
59 { "blocks_count", &set_sb.s_blocks_count, 4, parse_uint },
60 { "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint },
61 { "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint },
62 { "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint },
63 { "first_data_block", &set_sb.s_first_data_block, 4, parse_uint },
64 { "log_block_size", &set_sb.s_log_block_size, 4, parse_uint },
65 { "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int },
66 { "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint },
67 { "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint },
68 { "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint },
69 { "mtime", &set_sb.s_mtime, 4, parse_time },
70 { "wtime", &set_sb.s_wtime, 4, parse_time },
71 { "mnt_count", &set_sb.s_mnt_count, 2, parse_uint },
72 { "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int },
74 { "state", &set_sb.s_state, 2, parse_uint },
75 { "errors", &set_sb.s_errors, 2, parse_uint },
76 { "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint },
77 { "lastcheck", &set_sb.s_lastcheck, 4, parse_time },
78 { "checkinterval", &set_sb.s_checkinterval, 4, parse_uint },
79 { "creator_os", &set_sb.s_creator_os, 4, parse_uint },
80 { "rev_level", &set_sb.s_rev_level, 4, parse_uint },
81 { "def_resuid", &set_sb.s_def_resuid, 2, parse_uint },
82 { "def_resgid", &set_sb.s_def_resgid, 2, parse_uint },
83 { "first_ino", &set_sb.s_first_ino, 4, parse_uint },
84 { "inode_size", &set_sb.s_inode_size, 2, parse_uint },
85 { "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint },
86 { "feature_compat", &set_sb.s_feature_compat, 4, parse_uint },
87 { "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint },
88 { "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint },
89 { "uuid", &set_sb.s_uuid, 16, parse_uuid },
90 { "volume_name", &set_sb.s_volume_name, 16, parse_string },
91 { "last_mounted", &set_sb.s_last_mounted, 64, parse_string },
92 { "lastcheck", &set_sb.s_lastcheck, 4, parse_uint },
93 { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap,
95 { "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
96 { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
98 { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2,
101 { "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid },
102 { "journal_inum", &set_sb.s_journal_inum, 4, parse_uint },
103 { "journal_dev", &set_sb.s_journal_dev, 4, parse_uint },
104 { "last_orphan", &set_sb.s_last_orphan, 4, parse_uint },
105 { "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid },
106 { "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg },
107 { "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint },
108 /* s_reserved_word_pad */
109 { "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint },
110 { "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint },
111 { "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time },
112 { "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY,
114 { "flags", &set_sb.s_flags, 4, parse_uint },
118 static struct field_set_info inode_fields[] = {
119 { "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
120 { "mode", &set_inode.i_mode, 2, parse_uint },
121 { "uid", &set_inode.i_uid, 2, parse_uint },
122 { "size", &set_inode.i_size, 4, parse_uint },
123 { "atime", &set_inode.i_atime, 4, parse_time },
124 { "ctime", &set_inode.i_ctime, 4, parse_time },
125 { "mtime", &set_inode.i_mtime, 4, parse_time },
126 { "dtime", &set_inode.i_dtime, 4, parse_time },
127 { "gid", &set_inode.i_gid, 2, parse_uint },
128 { "links_count", &set_inode.i_links_count, 2, parse_uint },
129 { "blocks", &set_inode.i_blocks, 4, parse_uint },
130 { "flags", &set_inode.i_flags, 4, parse_uint },
131 { "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
132 { "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY,
134 { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
135 { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
136 { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
137 { "generation", &set_inode.i_generation, 4, parse_uint },
138 { "file_acl", &set_inode.i_file_acl, 4, parse_uint },
139 { "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
140 { "faddr", &set_inode.i_faddr, 4, parse_uint },
141 { "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint },
142 { "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint },
143 { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint },
144 { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
145 { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
146 { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
147 { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
151 static struct field_set_info ext2_bg_fields[] = {
152 { "block_bitmap", &set_gd.bg_block_bitmap, 4, parse_uint },
153 { "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint },
154 { "inode_table", &set_gd.bg_inode_table, 4, parse_uint },
155 { "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint },
156 { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
157 { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
158 { "flags", &set_gd.bg_flags, 2, parse_uint },
159 { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
160 { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
161 { "checksum", &set_gd.bg_checksum, 2, parse_uint },
166 static struct field_set_info *find_field(struct field_set_info *fields,
169 struct field_set_info *ss;
171 char *arg, *delim, *idx, *tmp;
174 if (fields == super_fields)
176 else if (fields == inode_fields)
180 prefix_len = strlen(prefix);
181 if (strncmp(field, prefix, prefix_len) == 0)
184 arg = malloc(strlen(field)+1);
189 idx = strchr(arg, '[');
192 delim = idx + strlen(idx) - 1;
193 if (!*idx || *delim != ']')
199 * Can we parse the number?
202 array_idx = strtol(idx, &tmp, 0);
207 for (ss = fields ; ss->name ; ss++) {
208 if (ss->flags & FLAG_ARRAY) {
209 if (!idx || (strcmp(ss->name, arg) != 0))
211 if (ss->max_idx > 0 && array_idx >= ss->max_idx)
214 if (strcmp(ss->name, field) != 0)
223 static errcode_t parse_uint(struct field_set_info *info, char *arg)
233 u.ptr8 = (__u8 *) info->ptr;
234 if (info->flags & FLAG_ARRAY)
235 u.ptr8 += array_idx * info->size;
237 num = strtoul(arg, &tmp, 0);
239 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
243 switch (info->size) {
257 static errcode_t parse_int(struct field_set_info *info, char *arg)
265 num = strtol(arg, &tmp, 0);
267 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
271 switch (info->size) {
273 ptr32 = (__s32 *) info->ptr;
277 ptr16 = (__s16 *) info->ptr;
281 ptr8 = (__s8 *) info->ptr;
288 static errcode_t parse_string(struct field_set_info *info, char *arg)
290 char *cp = (char *) info->ptr;
292 if (strlen(arg) >= info->size) {
293 fprintf(stderr, "Error maximum size for %s is %d.\n",
294 info->name, info->size);
301 static errcode_t parse_time(struct field_set_info *info, char *arg)
306 ptr32 = (__u32 *) info->ptr;
308 t = string_to_time(arg);
310 if (t == ((time_t) -1)) {
311 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
319 static errcode_t parse_uuid(struct field_set_info *info, char *arg)
321 unsigned char * p = (unsigned char *) info->ptr;
323 if ((strcasecmp(arg, "null") == 0) ||
324 (strcasecmp(arg, "clear") == 0)) {
326 } else if (strcasecmp(arg, "time") == 0) {
327 uuid_generate_time(p);
328 } else if (strcasecmp(arg, "random") == 0) {
330 } else if (uuid_parse(arg, p)) {
331 fprintf(stderr, "Invalid UUID format: %s\n", arg);
337 static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
340 unsigned char *p = (unsigned char *) info->ptr;
342 hashv = e2p_string2hash(arg);
344 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
351 static errcode_t parse_bmap(struct field_set_info *info, char *arg)
358 num = strtoul(arg, &tmp, 0);
360 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
366 retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET,
369 com_err("set_inode", retval, "while setting block map");
375 static void print_possible_fields(struct field_set_info *fields)
377 struct field_set_info *ss;
378 const char *type, *cmd;
380 char name[40], idx[40];
382 if (fields == super_fields) {
384 cmd = "set_super_value";
385 } else if (fields == inode_fields) {
389 type = "Block group descriptor";
390 cmd = "set_block_group";
394 fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
396 for (ss = fields ; ss->name ; ss++) {
398 if (ss->func == parse_string)
400 else if (ss->func == parse_int)
402 else if (ss->func == parse_uint)
403 type = "unsigned integer";
404 else if (ss->func == parse_uuid)
406 else if (ss->func == parse_hashalg)
407 type = "hash algorithm";
408 else if (ss->func == parse_time)
410 else if (ss->func == parse_bmap)
411 type = "set physical->logical block map";
412 strcpy(name, ss->name);
413 if (ss->flags & FLAG_ARRAY) {
415 sprintf(idx, "[%d]", ss->max_idx);
420 fprintf(f, "\t%-20s\t%s\n", name, type);
426 void do_set_super(int argc, char *argv[])
428 const char *usage = "<field> <value>\n"
429 "\t\"set_super_value -l\" will list the names of "
430 "superblock fields\n\twhich can be set.";
431 static struct field_set_info *ss;
433 if ((argc == 2) && !strcmp(argv[1], "-l")) {
434 print_possible_fields(super_fields);
438 if (common_args_process(argc, argv, 3, 3, "set_super_value",
442 if ((ss = find_field(super_fields, argv[1])) == 0) {
443 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
446 set_sb = *current_fs->super;
447 if (ss->func(ss, argv[2]) == 0) {
448 *current_fs->super = set_sb;
449 ext2fs_mark_super_dirty(current_fs);
453 void do_set_inode(int argc, char *argv[])
455 const char *usage = "<inode> <field> <value>\n"
456 "\t\"set_inode_field -l\" will list the names of "
457 "the fields in an ext2 inode\n\twhich can be set.";
458 static struct field_set_info *ss;
460 if ((argc == 2) && !strcmp(argv[1], "-l")) {
461 print_possible_fields(inode_fields);
465 if (common_args_process(argc, argv, 4, 4, "set_inode",
469 if ((ss = find_field(inode_fields, argv[2])) == 0) {
470 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
474 set_ino = string_to_inode(argv[1]);
478 if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
481 if (ss->func(ss, argv[3]) == 0) {
482 if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
487 void do_set_block_group_descriptor(int argc, char *argv[])
489 const char *usage = "<bg number> <field> <value>\n"
490 "\t\"set_block_group_descriptor -l\" will list the names of "
491 "the fields in a block group descriptor\n\twhich can be set.";
492 struct field_set_info *ss;
496 if ((argc == 2) && !strcmp(argv[1], "-l")) {
497 print_possible_fields(ext2_bg_fields);
501 if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
505 set_bg = strtoul(argv[1], &end, 0);
507 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
511 if (set_bg >= current_fs->group_desc_count) {
512 com_err(argv[0], 0, "block group number too big: %d", set_bg);
517 if ((ss = find_field(ext2_bg_fields, argv[2])) == 0) {
518 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
522 set_gd = current_fs->group_desc[set_bg];
524 if (ss->func(ss, argv[3]) == 0) {
525 current_fs->group_desc[set_bg] = set_gd;
526 ext2fs_mark_super_dirty(current_fs);