debugfs/set_fields.c

   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 #define FLAG_CSUM       0x0004
  57
  58 struct field_set_info {
  59         const char      *name;
  60         void    *ptr;
  61         void    *ptr2;
  62         unsigned int    size;
  63         errcode_t (*func)(struct field_set_info *info, char *field, char *arg);
  64         int flags;
  65         int max_idx;
  66 };
  67
  68 static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg);
  69 static errcode_t parse_int(struct field_set_info *info, char *field, char *arg);
  70 static errcode_t parse_string(struct field_set_info *info, char *field, char *arg);
  71 static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg);
  72 static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg);
  73 static errcode_t parse_encoding(struct field_set_info *info, char *field, char *arg);
  74 static errcode_t parse_time(struct field_set_info *info, char *field, char *arg);
  75 static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg);
  76 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg);
  77 static errcode_t parse_inode_csum(struct field_set_info *info, char *field,
  78                                   char *arg);
  79 static errcode_t parse_mmp_clear(struct field_set_info *info, char *field,
  80                                  char *arg);
  81
  82 #if __GNUC_PREREQ (4, 6) || defined(__clang__)
  83 #pragma GCC diagnostic push
  84 #pragma GCC diagnostic ignored "-Wmissing-field-initializers"
  85 #endif
  86
  87 static struct field_set_info super_fields[] = {
  88         { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
  89         { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi,
  90                 4, parse_uint },
  91         { "r_blocks_count", &set_sb.s_r_blocks_count,
  92                 &set_sb.s_r_blocks_count_hi, 4, parse_uint },
  93         { "free_blocks_count", &set_sb.s_free_blocks_count,
  94                 &set_sb.s_free_blocks_hi, 4, parse_uint },
  95         { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint },
  96         { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint },
  97         { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint },
  98         { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int },
  99         { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint },
 100         { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint },
 101         { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint },
 102         { "mtime", &set_sb.s_mtime, NULL, 4, parse_time },
 103         { "wtime", &set_sb.s_wtime, NULL, 4, parse_time },
 104         { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint },
 105         { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int },
 106         /* s_magic */
 107         { "state", &set_sb.s_state, NULL, 2, parse_uint },
 108         { "errors", &set_sb.s_errors, NULL, 2, parse_uint },
 109         { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint },
 110         { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time },
 111         { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint },
 112         { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint },
 113         { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint },
 114         { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint },
 115         { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint },
 116         { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint },
 117         { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint },
 118         { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint },
 119         { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint },
 120         { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint },
 121         { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint },
 122         { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid },
 123         { "volume_name",  &set_sb.s_volume_name, NULL, 16, parse_string },
 124         { "last_mounted",  &set_sb.s_last_mounted, NULL, 64, parse_string },
 125         { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL,
 126                   4, parse_uint },
 127         { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint },
 128         { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1,
 129                   parse_uint },
 130         { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2,
 131                   parse_uint },
 132         { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid },
 133         { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint },
 134         { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint },
 135         { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint },
 136         { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid },
 137         { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg },
 138         { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint },
 139         { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint },
 140         { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint },
 141         { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint },
 142         { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time },
 143         { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY,
 144           17 },
 145         { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint },
 146         { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint },
 147         { "flags", &set_sb.s_flags, NULL, 4, parse_uint },
 148         { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint },
 149         { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint },
 150         { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint },
 151         { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint },
 152         { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint },
 153         { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint },
 154         { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint },
 155         { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint },
 156         { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count,
 157           NULL, 8, parse_uint },
 158         { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint },
 159         { "mount_opts",  &set_sb.s_mount_opts, NULL, 64, parse_string },
 160         { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint },
 161         { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint },
 162         { "prj_quota_inum", &set_sb.s_prj_quota_inum, NULL, 4, parse_uint },
 163         { "overhead_clusters", &set_sb.s_overhead_clusters, NULL, 4, parse_uint },
 164         { "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint,
 165           FLAG_ARRAY, 2 },
 166         { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
 167         { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint },
 168         { "encryption_level", &set_sb.s_encryption_level, NULL, 1, parse_uint },
 169         { "error_count", &set_sb.s_error_count, NULL, 4, parse_uint },
 170         { "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time },
 171         { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
 172         { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint },
 173         { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string },
 174         { "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint },
 175         { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time },
 176         { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
 177         { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint },
 178         { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string },
 179         { "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint },
 180         { "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint,
 181           FLAG_ARRAY, 4 },
 182         { "encrypt_pw_salt", &set_sb.s_encrypt_pw_salt, NULL, 16, parse_uuid },
 183         { "lpf_ino", &set_sb.s_lpf_ino, NULL, 4, parse_uint },
 184         { "checksum_seed", &set_sb.s_checksum_seed, NULL, 4, parse_uint },
 185         { "encoding", &set_sb.s_encoding, NULL, 2, parse_encoding },
 186         { "orphan_file_inum", &set_sb.s_orphan_file_inum, NULL, 4, parse_uint },
 187         { 0, 0, 0, 0 }
 188 };
 189
 190 static struct field_set_info inode_fields[] = {
 191         { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
 192         { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
 193                 2, parse_uint },
 194         { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
 195         { "atime", &set_inode.i_atime, &set_inode.i_atime_extra,
 196                 4, parse_time },
 197         { "ctime", &set_inode.i_ctime, &set_inode.i_ctime_extra,
 198                 4, parse_time },
 199         { "mtime", &set_inode.i_mtime, &set_inode.i_mtime_extra,
 200                 4, parse_time },
 201         { "dtime", &set_inode.i_dtime, NULL,
 202                 4, parse_time },
 203         { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
 204                 2, parse_uint },
 205         { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
 206         /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
 207         { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
 208                 6, parse_uint },
 209         { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
 210         { "version", &set_inode.osd1.linux1.l_i_version,
 211                 &set_inode.i_version_hi, 4, parse_uint },
 212         { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL,
 213                 4, parse_uint, FLAG_ALIAS },
 214         { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
 215           EXT2_NDIR_BLOCKS },
 216         { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
 217         { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
 218         { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
 219         { "generation", &set_inode.i_generation, NULL, 4, parse_uint },
 220         /* Special case: i_file_acl_high is 2 bytes */
 221         { "file_acl", &set_inode.i_file_acl,
 222                 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
 223         { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
 224         { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS },
 225         { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
 226         { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
 227                 &set_inode.i_checksum_hi, 2, parse_inode_csum, FLAG_CSUM },
 228         { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
 229                 4, parse_uint, FLAG_ALIAS },
 230         { "extra_isize", &set_inode.i_extra_isize, NULL,
 231                 2, parse_uint },
 232         { "ctime_extra", &set_inode.i_ctime_extra, NULL,
 233                 4, parse_uint, FLAG_ALIAS },
 234         { "mtime_extra", &set_inode.i_mtime_extra, NULL,
 235                 4, parse_uint, FLAG_ALIAS  },
 236         { "atime_extra", &set_inode.i_atime_extra, NULL,
 237                 4, parse_uint, FLAG_ALIAS },
 238         { "crtime", &set_inode.i_crtime, &set_inode.i_crtime_extra,
 239                 4, parse_time },
 240         { "crtime_extra", &set_inode.i_crtime_extra, NULL,
 241                 4, parse_uint, FLAG_ALIAS },
 242         { "projid", &set_inode.i_projid, NULL, 4, parse_uint },
 243         { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
 244         { 0, 0, 0, 0 }
 245 };
 246
 247 static struct field_set_info ext2_bg_fields[] = {
 248         { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
 249         { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
 250         { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
 251         { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
 252         { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
 253         { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
 254         { "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
 255         { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
 256         { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
 257         { 0, 0, 0, 0 }
 258 };
 259
 260 static struct field_set_info ext4_bg_fields[] = {
 261         { "block_bitmap", &set_gd4.bg_block_bitmap,
 262                 &set_gd4.bg_block_bitmap_hi, 4, parse_uint },
 263         { "inode_bitmap", &set_gd4.bg_inode_bitmap,
 264                 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
 265         { "inode_table", &set_gd4.bg_inode_table,
 266                 &set_gd4.bg_inode_table_hi, 4, parse_uint },
 267         { "free_blocks_count", &set_gd4.bg_free_blocks_count,
 268                 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
 269         { "free_inodes_count", &set_gd4.bg_free_inodes_count,
 270                 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
 271         { "used_dirs_count", &set_gd4.bg_used_dirs_count,
 272                 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
 273         { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
 274         { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
 275                 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
 276         { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
 277                 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
 278         { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
 279                 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
 280         { "itable_unused", &set_gd4.bg_itable_unused,
 281                 &set_gd4.bg_itable_unused_hi, 2, parse_uint },
 282         { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
 283         { 0, 0, 0, 0 }
 284 };
 285
 286 static struct field_set_info mmp_fields[] = {
 287         { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp),
 288                 parse_mmp_clear, FLAG_ALIAS },
 289         { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
 290         { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
 291         { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
 292         { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
 293                 parse_string },
 294         { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
 295                 parse_string },
 296         { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
 297         { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
 298         { 0, 0, 0, 0 }
 299 };
 300 #if __GNUC_PREREQ (4, 6)
 301 #pragma GCC diagnostic pop
 302 #endif
 303
 304 #ifdef UNITTEST
 305
 306
 307 static void do_verify_field_set_info(struct field_set_info *fields,
 308                 const void *data, size_t size)
 309 {
 310         struct field_set_info *ss, *ss2;
 311         const char *begin = (char *)data;
 312         const char *end = begin + size;
 313
 314         for (ss = fields ; ss->name ; ss++) {
 315                 const char *ptr;
 316
 317                 /* Check pointers */
 318                 ptr = ss->ptr;
 319                 assert(!ptr || (ptr >= begin && ptr < end));
 320                 ptr = ss->ptr2;
 321                 assert(!ptr || (ptr >= begin && ptr < end));
 322
 323                 /* Check function */
 324                 assert(ss->func);
 325
 326                 for (ss2 = fields ; ss2 != ss ; ss2++) {
 327                         /* Check duplicate names */
 328                         assert(strcmp(ss->name, ss2->name));
 329
 330                         if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS)
 331                                 continue;
 332                         /* Check false aliases, might be copy-n-paste error */
 333                         assert(!ss->ptr || (ss->ptr != ss2->ptr &&
 334                                             ss->ptr != ss2->ptr2));
 335                         assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr &&
 336                                              ss->ptr2 != ss2->ptr2));
 337                 }
 338         }
 339 }
 340
 341 int main(int argc, char **argv)
 342 {
 343         do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb));
 344         do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode));
 345         do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd));
 346         do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4));
 347         do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp));
 348         return 0;
 349 }
 350
 351 ext2_filsys current_fs;
 352 ext2_ino_t root, cwd;
 353
 354 #endif /* UNITTEST */
 355
 356 static int check_suffix(const char *field)
 357 {
 358         int len = strlen(field);
 359
 360         if (len <= 3)
 361                 return 0;
 362         field += len-3;
 363         if (!strcmp(field, "_lo"))
 364                 return 1;
 365         if (!strcmp(field, "_hi"))
 366                 return 2;
 367         return 0;
 368 }
 369
 370 static struct field_set_info *find_field(struct field_set_info *fields,
 371                                          char *field)
 372 {
 373         struct field_set_info *ss;
 374         const char      *prefix;
 375         char            *arg, *delim, *idx, *tmp;
 376         int             suffix, prefix_len;
 377
 378         if (fields == super_fields)
 379                 prefix = "s_";
 380         else if (fields == inode_fields)
 381                 prefix = "i_";
 382         else
 383                 prefix = "bg_";
 384         prefix_len = strlen(prefix);
 385         if (strncmp(field, prefix, prefix_len) == 0)
 386                 field += prefix_len;
 387
 388         arg = malloc(strlen(field)+1);
 389         if (!arg)
 390                 return NULL;
 391         strcpy(arg, field);
 392
 393         idx = strchr(arg, '[');
 394         if (idx) {
 395                 *idx++ = 0;
 396                 delim = idx + strlen(idx) - 1;
 397                 if (!*idx || *delim != ']')
 398                         idx = 0;
 399                 else
 400                         *delim = 0;
 401         }
 402         /*
 403          * Can we parse the number?
 404          */
 405         if (idx) {
 406                 array_idx = strtol(idx, &tmp, 0);
 407                 if (*tmp) {
 408                         *(--idx) = '[';
 409                         *delim = ']';
 410                         idx = 0;
 411                 }
 412         }
 413
 414         /*
 415          * If there is a valid _hi or a _lo suffix, strip it off
 416          */
 417         suffix = check_suffix(arg);
 418         if (suffix > 0)
 419                 arg[strlen(arg)-3] = 0;
 420
 421         for (ss = fields ; ss->name ; ss++) {
 422                 if (suffix && ss->ptr2 == 0)
 423                         continue;
 424                 if (ss->flags & FLAG_ARRAY) {
 425                         if (!idx || (strcmp(ss->name, arg) != 0))
 426                                 continue;
 427                         if (ss->max_idx > 0 && array_idx >= ss->max_idx)
 428                                 continue;
 429                 } else {
 430                         if (strcmp(ss->name, arg) != 0)
 431                                 continue;
 432                 }
 433                 free(arg);
 434                 return ss;
 435         }
 436         free(arg);
 437         return NULL;
 438 }
 439
 440 /*
 441  * Note: info->size == 6 is special; this means a base size 4 bytes,
 442  * and secondary (high) size of 2 bytes.  This is needed for the
 443  * special case of i_blocks_high and i_file_acl_high.
 444  */
 445 static errcode_t parse_uint(struct field_set_info *info, char *field,
 446                             char *arg)
 447 {
 448         unsigned long long n, num, mask, limit;
 449         int suffix = check_suffix(field);
 450         char *tmp;
 451         void *field1 = info->ptr, *field2 = info->ptr2;
 452         int size = (info->size == 6) ? 4 : info->size;
 453         union {
 454                 __u64   *ptr64;
 455                 __u32   *ptr32;
 456                 __u16   *ptr16;
 457                 __u8    *ptr8;
 458         } u;
 459
 460         if (suffix == 1)
 461                 field2 = 0;
 462         if (suffix == 2) {
 463                 field1 = field2;
 464                 field2 = 0;
 465         }
 466
 467         u.ptr8 = (__u8 *) field1;
 468         if (info->flags & FLAG_ARRAY)
 469                 u.ptr8 += array_idx * info->size;
 470
 471         errno = 0;
 472         num = STRTOULL(arg, &tmp, 0);
 473         if (*tmp || errno) {
 474                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 475                         arg, info->name);
 476                 return EINVAL;
 477         }
 478         mask = ~0ULL >> ((8 - size) * 8);
 479         limit = ~0ULL >> ((8 - info->size) * 8);
 480         if (field2 && info->size != 6)
 481                 limit = ~0ULL >> ((8 - info->size*2) * 8);
 482
 483         if (num > limit) {
 484                 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
 485                         arg, info->name, limit);
 486                 return EINVAL;
 487         }
 488         n = num & mask;
 489         switch (size) {
 490         case 8:
 491                 *u.ptr64 = n;
 492                 break;
 493         case 4:
 494                 *u.ptr32 = n;
 495                 break;
 496         case 2:
 497                 *u.ptr16 = n;
 498                 break;
 499         case 1:
 500                 *u.ptr8 = n;
 501                 break;
 502         }
 503         if (!field2)
 504                 return 0;
 505         n = (size == 8) ? 0 : (num >> (size*8));
 506         u.ptr8 = (__u8 *) field2;
 507         if (info->size == 6)
 508                 size = 2;
 509         switch (size) {
 510         case 8:
 511                 /* Should never get here */
 512                 fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
 513                         "defined; BUG?!?\n", info->name);
 514                 *u.ptr64 = 0;
 515                 break;
 516         case 4:
 517                 *u.ptr32 = n;
 518                 break;
 519         case 2:
 520                 *u.ptr16 = n;
 521                 break;
 522         case 1:
 523                 *u.ptr8 = n;
 524                 break;
 525         }
 526         return 0;
 527 }
 528
 529 static errcode_t parse_int(struct field_set_info *info,
 530                            char *field EXT2FS_ATTR((unused)), char *arg)
 531 {
 532         long    num;
 533         char *tmp;
 534         __s32   *ptr32;
 535         __s16   *ptr16;
 536         __s8    *ptr8;
 537
 538         num = strtol(arg, &tmp, 0);
 539         if (*tmp) {
 540                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 541                         arg, info->name);
 542                 return EINVAL;
 543         }
 544         switch (info->size) {
 545         case 4:
 546                 ptr32 = (__s32 *) info->ptr;
 547                 *ptr32 = num;
 548                 break;
 549         case 2:
 550                 ptr16 = (__s16 *) info->ptr;
 551                 *ptr16 = num;
 552                 break;
 553         case 1:
 554                 ptr8 = (__s8 *) info->ptr;
 555                 *ptr8 = num;
 556                 break;
 557         }
 558         return 0;
 559 }
 560
 561 static errcode_t parse_string(struct field_set_info *info,
 562                               char *field EXT2FS_ATTR((unused)), char *arg)
 563 {
 564         char    *cp = (char *) info->ptr;
 565
 566         if (strlen(arg) >= info->size) {
 567                 fprintf(stderr, "Error maximum size for %s is %d.\n",
 568                         info->name, info->size);
 569                 return EINVAL;
 570         }
 571         strcpy(cp, arg);
 572         return 0;
 573 }
 574
 575 static errcode_t parse_time(struct field_set_info *info,
 576                             char *field, char *arg)
 577 {
 578         __s64           t;
 579         __u32           t_low, t_high;
 580         __u32           *ptr_low, *ptr_high;
 581
 582         if (check_suffix(field))
 583                 return parse_uint(info, field, arg);
 584
 585         ptr_low  = (__u32 *) info->ptr;
 586         ptr_high = (__u32 *) info->ptr2;
 587
 588         t = string_to_time(arg);
 589
 590         if (t == -1) {
 591                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 592                         arg, info->name);
 593                 return EINVAL;
 594         }
 595         t_low = (__u32) t;
 596         t_high = ((t - (__s32)t) >> 32) & EXT4_EPOCH_MASK;
 597         *ptr_low = t_low;
 598         if (ptr_high)
 599                 *ptr_high = (*ptr_high & ~EXT4_EPOCH_MASK) | t_high;
 600         return 0;
 601 }
 602
 603 static errcode_t parse_uuid(struct field_set_info *info,
 604                             char *field EXT2FS_ATTR((unused)), char *arg)
 605 {
 606         unsigned char * p = (unsigned char *) info->ptr;
 607
 608         if ((strcasecmp(arg, "null") == 0) ||
 609             (strcasecmp(arg, "clear") == 0)) {
 610                 uuid_clear(p);
 611         } else if (strcasecmp(arg, "time") == 0) {
 612                 uuid_generate_time(p);
 613         } else if (strcasecmp(arg, "random") == 0) {
 614                 uuid_generate(p);
 615         } else if (uuid_parse(arg, p)) {
 616                 fprintf(stderr, "Invalid UUID format: %s\n", arg);
 617                 return EINVAL;
 618         }
 619         return 0;
 620 }
 621
 622 static errcode_t parse_hashalg(struct field_set_info *info,
 623                                char *field EXT2FS_ATTR((unused)), char *arg)
 624 {
 625         int     hashv;
 626         unsigned char   *p = (unsigned char *) info->ptr;
 627
 628         hashv = e2p_string2hash(arg);
 629         if (hashv < 0) {
 630                 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
 631                 return EINVAL;
 632         }
 633         *p = hashv;
 634         return 0;
 635 }
 636
 637 static errcode_t parse_encoding(struct field_set_info *info,
 638                                 char *field EXT2FS_ATTR((unused)), char *arg)
 639 {
 640         int     encoding;
 641         unsigned char   *p = (unsigned char *) info->ptr;
 642
 643         encoding = e2p_str2encoding(arg);
 644         if (encoding < 0)
 645                 return parse_uint(info, field, arg);
 646         *p = encoding;
 647         return 0;
 648 }
 649
 650 static errcode_t parse_bmap(struct field_set_info *info,
 651                             char *field EXT2FS_ATTR((unused)), char *arg)
 652 {
 653         blk64_t         blk;
 654         errcode_t       retval;
 655         char            *tmp;
 656
 657         blk = strtoull(arg, &tmp, 0);
 658         if (*tmp) {
 659                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 660                         arg, info->name);
 661                 return EINVAL;
 662         }
 663
 664         retval = ext2fs_bmap2(current_fs, set_ino,
 665                               (struct ext2_inode *) &set_inode,
 666                               NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL,
 667                               &blk);
 668         if (retval) {
 669                 com_err("set_inode", retval, "while setting block map");
 670         }
 671         return retval;
 672 }
 673
 674 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
 675                                char *arg)
 676 {
 677         __u16 *checksum = info->ptr;
 678
 679         if (strcmp(arg, "calc") == 0) {
 680                 *checksum = ext2fs_group_desc_csum(current_fs, set_bg);
 681                 printf("Checksum set to 0x%04x\n", *checksum);
 682                 return 0;
 683         }
 684         return parse_uint(info, field, arg);
 685 }
 686
 687 static errcode_t parse_inode_csum(struct field_set_info *info, char *field,
 688                                   char *arg)
 689 {
 690         errcode_t       retval = 0;
 691         __u32           crc;
 692         int             is_large_inode = 0;
 693
 694         if (strcmp(arg, "calc") == 0) {
 695                 size_t sz = EXT2_INODE_SIZE(current_fs->super);
 696                 struct ext2_inode_large *tmp_inode = NULL;
 697
 698                 retval = ext2fs_get_mem(sz, &tmp_inode);
 699                 if (retval)
 700                         goto out;
 701
 702                 retval = ext2fs_read_inode_full(current_fs, set_ino,
 703                                      (struct ext2_inode *) tmp_inode,
 704                                      sz);
 705                 if (retval)
 706                         goto out;
 707
 708 #ifdef WORDS_BIGENDIAN
 709                 ext2fs_swap_inode_full(current_fs, tmp_inode,
 710                                        tmp_inode, 1, sz);
 711 #endif
 712
 713                 if (sz > EXT2_GOOD_OLD_INODE_SIZE)
 714                         is_large_inode = 1;
 715
 716                 retval = ext2fs_inode_csum_set(current_fs, set_ino,
 717                                                tmp_inode);
 718                 if (retval)
 719                         goto out;
 720 #ifdef WORDS_BIGENDIAN
 721                 crc = set_inode.i_checksum_lo =
 722                         ext2fs_swab16(tmp_inode->i_checksum_lo);
 723
 724 #else
 725                 crc = set_inode.i_checksum_lo = tmp_inode->i_checksum_lo;
 726 #endif
 727                 if (is_large_inode &&
 728                     set_inode.i_extra_isize >=
 729                                 (offsetof(struct ext2_inode_large,
 730                                           i_checksum_hi) -
 731                                  EXT2_GOOD_OLD_INODE_SIZE)) {
 732 #ifdef WORDS_BIGENDIAN
 733                         set_inode.i_checksum_lo =
 734                                 ext2fs_swab16(tmp_inode->i_checksum_lo);
 735 #else
 736                         set_inode.i_checksum_hi = tmp_inode->i_checksum_hi;
 737 #endif
 738                         crc |= ((__u32)set_inode.i_checksum_hi) << 16;
 739                 }
 740                 printf("Checksum set to 0x%08x\n", crc);
 741         out:
 742                 ext2fs_free_mem(&tmp_inode);
 743                 return retval;
 744         }
 745         return parse_uint(info, field, arg);
 746 }
 747
 748 static void print_possible_fields(struct field_set_info *fields)
 749 {
 750         struct field_set_info *ss;
 751         const char      *type, *cmd;
 752         FILE *f;
 753         char name[40], idx[40];
 754
 755         if (fields == super_fields) {
 756                 type = "Superblock";
 757                 cmd = "set_super_value";
 758         } else if (fields == inode_fields) {
 759                 type = "Inode";
 760                 cmd = "set_inode";
 761         } else if (fields == mmp_fields) {
 762                 type = "MMP";
 763                 cmd = "set_mmp_value";
 764         } else {
 765                 type = "Block group descriptor";
 766                 cmd = "set_block_group";
 767         }
 768         f = open_pager();
 769
 770         fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
 771
 772         for (ss = fields ; ss->name ; ss++) {
 773                 type = "unknown";
 774                 if (ss->func == parse_string)
 775                         type = "string";
 776                 else if (ss->func == parse_int)
 777                         type = "integer";
 778                 else if (ss->func == parse_uint)
 779                         type = "unsigned integer";
 780                 else if (ss->func == parse_uuid)
 781                         type = "UUID";
 782                 else if (ss->func == parse_hashalg)
 783                         type = "hash algorithm";
 784                 else if (ss->func == parse_time)
 785                         type = "date/time";
 786                 else if (ss->func == parse_bmap)
 787                         type = "set physical->logical block map";
 788                 else if (ss->func == parse_gd_csum)
 789                         type = "unsigned integer OR \"calc\"";
 790                 strcpy(name, ss->name);
 791                 if (ss->flags & FLAG_ARRAY) {
 792                         if (ss->max_idx > 0)
 793                                 sprintf(idx, "[%d]", ss->max_idx);
 794                         else
 795                                 strcpy(idx, "[]");
 796                         strcat(name, idx);
 797                 }
 798                 if (ss->ptr2)
 799                         strcat(name, "[_hi|_lo]");
 800                 fprintf(f, "\t%-25s\t%s\n", name, type);
 801         }
 802         close_pager(f);
 803 }
 804
 805
 806 void do_set_super(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
 807                   void *infop EXT2FS_ATTR((unused)))
 808 {
 809         const char *usage = "<field> <value>\n"
 810                 "\t\"set_super_value -l\" will list the names of "
 811                 "superblock fields\n\twhich can be set.";
 812         static struct field_set_info *ss;
 813
 814         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 815                 print_possible_fields(super_fields);
 816                 return;
 817         }
 818
 819         if (common_args_process(argc, argv, 3, 3, "set_super_value",
 820                                 usage, CHECK_FS_RW))
 821                 return;
 822
 823         if ((ss = find_field(super_fields, argv[1])) == 0) {
 824                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 825                 return;
 826         }
 827         set_sb = *current_fs->super;
 828         if (ss->func(ss, argv[1], argv[2]) == 0) {
 829                 *current_fs->super = set_sb;
 830                 ext2fs_mark_super_dirty(current_fs);
 831         }
 832 }
 833
 834 void do_set_inode(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
 835                   void *infop EXT2FS_ATTR((unused)))
 836 {
 837         const char *usage = "<inode> <field> <value>\n"
 838                 "\t\"set_inode_field -l\" will list the names of "
 839                 "the fields in an ext2 inode\n\twhich can be set.";
 840         static struct field_set_info *ss;
 841
 842         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 843                 print_possible_fields(inode_fields);
 844                 return;
 845         }
 846
 847         if (common_args_process(argc, argv, 4, 4, "set_inode",
 848                                 usage, CHECK_FS_RW))
 849                 return;
 850
 851         if ((ss = find_field(inode_fields, argv[2])) == 0) {
 852                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 853                 return;
 854         }
 855
 856         set_ino = string_to_inode(argv[1]);
 857         if (!set_ino)
 858                 return;
 859
 860         if (debugfs_read_inode2(set_ino,
 861                                 (struct ext2_inode *) &set_inode, argv[1],
 862                                 sizeof(set_inode),
 863                                 (ss->flags & FLAG_CSUM) ?
 864                                 READ_INODE_NOCSUM : 0))
 865                 return;
 866
 867         if (ss->func(ss, argv[2], argv[3]) == 0) {
 868                 debugfs_write_inode2(set_ino,
 869                                      (struct ext2_inode *) &set_inode,
 870                                      argv[1], sizeof(set_inode),
 871                                      (ss->flags & FLAG_CSUM) ?
 872                                      WRITE_INODE_NOCSUM : 0);
 873         }
 874 }
 875
 876 void do_set_block_group_descriptor(int argc, char *argv[],
 877                                    int sci_idx EXT2FS_ATTR((unused)),
 878                                    void *infop EXT2FS_ATTR((unused)))
 879 {
 880         const char *usage = "<bg number> <field> <value>\n"
 881                 "\t\"set_block_group -l\" will list the names of "
 882                 "the fields in a block group descriptor\n\twhich can be set.";
 883         struct field_set_info   *table;
 884         struct field_set_info   *ss;
 885         char                    *end;
 886         void                    *edit, *target;
 887         int                     size;
 888
 889         /*
 890          * Determine whether we are editing an ext2 or ext4 block group
 891          * descriptor.  Descriptors larger than ext4_group_desc cannot
 892          * have their fields edited yet, because they do not have any
 893          * names assigned.  When that happens, this function needs to
 894          * be updated for the new descriptor struct and fields.
 895          */
 896         if (current_fs &&
 897             EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) {
 898                 table = ext4_bg_fields;
 899                 edit = &set_gd4;
 900                 size = sizeof(set_gd4);
 901         } else {
 902                 table = ext2_bg_fields;
 903                 edit = &set_gd;
 904                 size = sizeof(set_gd);
 905         }
 906
 907         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 908                 print_possible_fields(table);
 909                 return;
 910         }
 911
 912         if (common_args_process(argc, argv, 4, 4, "set_block_group",
 913                                 usage, CHECK_FS_RW))
 914                 return;
 915
 916         set_bg = strtoul(argv[1], &end, 0);
 917         if (*end) {
 918                 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
 919                 return;
 920         }
 921
 922         if (set_bg >= current_fs->group_desc_count) {
 923                 com_err(argv[0], 0, "block group number too big: %d", set_bg);
 924                 return;
 925         }
 926
 927         if ((ss = find_field(table, argv[2])) == 0) {
 928                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 929                 return;
 930         }
 931
 932         target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
 933         memcpy(edit, target, size);
 934         if (ss->func(ss, argv[2], argv[3]) == 0) {
 935                 memcpy(target, edit, size);
 936                 ext2fs_mark_super_dirty(current_fs);
 937         }
 938 }
 939
 940 static errcode_t parse_mmp_clear(struct field_set_info *info,
 941                                  char *field EXT2FS_ATTR((unused)),
 942                                  char *arg EXT2FS_ATTR((unused)))
 943 {
 944         errcode_t retval;
 945
 946         retval = ext2fs_mmp_clear(current_fs);
 947         if (retval != 0)
 948                 com_err("set_mmp_value", retval, "while clearing MMP block\n");
 949         else
 950                 memcpy(info->ptr, current_fs->mmp_buf, info->size);
 951
 952         return 1; /* we don't need the MMP block written again */
 953 }
 954
 955 #ifdef CONFIG_MMP
 956 void do_set_mmp_value(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
 957                       void *infop EXT2FS_ATTR((unused)))
 958 {
 959         const char *usage = "<field> <value>\n"
 960                 "\t\"set_mmp_value -l\" will list the names of "
 961                 "MMP fields\n\twhich can be set.";
 962         static struct field_set_info *smmp;
 963         struct mmp_struct *mmp_s;
 964         errcode_t retval;
 965
 966         if (argc == 2 && strcmp(argv[1], "-l") == 0) {
 967                 print_possible_fields(mmp_fields);
 968                 return;
 969         }
 970
 971         if (check_fs_open(argv[0]))
 972                 return;
 973
 974         if (current_fs->super->s_mmp_block == 0) {
 975                 com_err(argv[0], 0, "no MMP block allocated\n");
 976                 return;
 977         }
 978
 979         if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
 980                                 usage, CHECK_FS_RW))
 981                 return;
 982
 983         mmp_s = current_fs->mmp_buf;
 984         if (mmp_s == NULL) {
 985                 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
 986                 if (retval) {
 987                         com_err(argv[0], retval, "allocating MMP buffer\n");
 988                         return;
 989                 }
 990                 retval = ext2fs_mmp_read(current_fs,
 991                                          current_fs->super->s_mmp_block, mmp_s);
 992                 if (retval) {
 993                         com_err(argv[0], retval, "reading MMP block %llu.\n",
 994                                 (long long)current_fs->super->s_mmp_block);
 995                         ext2fs_free_mem(&mmp_s);
 996                         return;
 997                 }
 998                 current_fs->mmp_buf = mmp_s;
 999         }
1000
1001         smmp = find_field(mmp_fields, argv[1]);
1002         if (smmp == 0) {
1003                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
1004                 return;
1005         }
1006
1007         set_mmp = *mmp_s;
1008         if (smmp->func(smmp, argv[1], argv[2]) == 0) {
1009                 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
1010                                  &set_mmp);
1011                 *mmp_s = set_mmp;
1012         }
1013 }
1014 #else
1015 void do_set_mmp_value(int argc EXT2FS_ATTR((unused)),
1016                       char *argv[] EXT2FS_ATTR((unused)),
1017                       int sci_idx EXT2FS_ATTR((unused)),
1018                       void *infop EXT2FS_ATTR((unused)))
1019 {
1020         fprintf(stdout, "MMP is unsupported, please recompile with "
1021                         "--enable-mmp\n");
1022 }
1023 #endif
1024