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