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 #if HAVE_STRINGS_H
  34 #include <strings.h>
  35 #endif
  36 #include <fcntl.h>
  37 #include <utime.h>
  38
  39 #include "debugfs.h"
  40 #include "uuid/uuid.h"
  41 #include "e2p/e2p.h"
  42
  43 static struct ext2_super_block set_sb;
  44 static struct ext2_inode_large set_inode;
  45 static struct ext2_group_desc set_gd;
  46 static struct ext4_group_desc set_gd4;
  47 static struct mmp_struct set_mmp;
  48 static dgrp_t set_bg;
  49 static ext2_ino_t set_ino;
  50 static int array_idx;
  51
  52 #define FLAG_ARRAY      0x0001
  53
  54 struct field_set_info {
  55         const char      *name;
  56         void    *ptr;
  57         void    *ptr2;
  58         unsigned int    size;
  59         errcode_t (*func)(struct field_set_info *info, char *field, char *arg);
  60         int flags;
  61         int max_idx;
  62 };
  63
  64 static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg);
  65 static errcode_t parse_int(struct field_set_info *info, char *field, char *arg);
  66 static errcode_t parse_string(struct field_set_info *info, char *field, char *arg);
  67 static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg);
  68 static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg);
  69 static errcode_t parse_time(struct field_set_info *info, char *field, char *arg);
  70 static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg);
  71 static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg);
  72 static errcode_t parse_mmp_clear(struct field_set_info *info, char *field,
  73                                  char *arg);
  74
  75 static struct field_set_info super_fields[] = {
  76         { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
  77         { "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi,
  78                 4, parse_uint },
  79         { "r_blocks_count", &set_sb.s_r_blocks_count,
  80                 &set_sb.s_r_blocks_count_hi, 4, parse_uint },
  81         { "free_blocks_count", &set_sb.s_free_blocks_count,
  82                 &set_sb.s_free_blocks_hi, 4, parse_uint },
  83         { "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint },
  84         { "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint },
  85         { "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint },
  86         { "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int },
  87         { "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint },
  88         { "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint },
  89         { "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint },
  90         { "mtime", &set_sb.s_mtime, NULL, 4, parse_time },
  91         { "wtime", &set_sb.s_wtime, NULL, 4, parse_time },
  92         { "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint },
  93         { "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int },
  94         /* s_magic */
  95         { "state", &set_sb.s_state, NULL, 2, parse_uint },
  96         { "errors", &set_sb.s_errors, NULL, 2, parse_uint },
  97         { "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint },
  98         { "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time },
  99         { "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint },
 100         { "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint },
 101         { "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint },
 102         { "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint },
 103         { "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint },
 104         { "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint },
 105         { "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint },
 106         { "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint },
 107         { "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint },
 108         { "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint },
 109         { "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint },
 110         { "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid },
 111         { "volume_name",  &set_sb.s_volume_name, NULL, 16, parse_string },
 112         { "last_mounted",  &set_sb.s_last_mounted, NULL, 64, parse_string },
 113         { "lastcheck",  &set_sb.s_lastcheck, NULL, 4, parse_uint },
 114         { "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL,
 115                   4, parse_uint },
 116         { "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint },
 117         { "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1,
 118                   parse_uint },
 119         { "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2,
 120                   parse_uint },
 121         { "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid },
 122         { "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint },
 123         { "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint },
 124         { "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint },
 125         { "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid },
 126         { "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg },
 127         { "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint },
 128         { "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint },
 129         { "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint },
 130         { "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint },
 131         { "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time },
 132         { "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY,
 133           17 },
 134         { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint },
 135         { "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint },
 136         { "flags", &set_sb.s_flags, NULL, 4, parse_uint },
 137         { "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint },
 138         { "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 4, parse_uint },
 139         { "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint },
 140         { "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint },
 141         { "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint },
 142         { "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint },
 143         { "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint },
 144         { "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint },
 145         { "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint },
 146         { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count,
 147           NULL, 8, parse_uint },
 148         { "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint },
 149         { "mount_opts",  &set_sb.s_mount_opts, NULL, 64, parse_string },
 150         { "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint },
 151         { "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint },
 152         { "overhead_blocks", &set_sb.s_overhead_blocks, NULL, 4, parse_uint },
 153         { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
 154         { 0, 0, 0, 0 }
 155 };
 156
 157 static struct field_set_info inode_fields[] = {
 158         { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
 159         { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
 160         { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
 161                 2, parse_uint },
 162         { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
 163         { "atime", &set_inode.i_atime, NULL, 4, parse_time },
 164         { "ctime", &set_inode.i_ctime, NULL, 4, parse_time },
 165         { "mtime", &set_inode.i_mtime, NULL, 4, parse_time },
 166         { "dtime", &set_inode.i_dtime, NULL, 4, parse_time },
 167         { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
 168                 2, parse_uint },
 169         { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
 170         /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
 171         { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
 172                 6, parse_uint },
 173         { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
 174         { "version", &set_inode.osd1.linux1.l_i_version,
 175                 &set_inode.i_version_hi, 4, parse_uint },
 176         { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint },
 177         { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
 178           EXT2_NDIR_BLOCKS },
 179         { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
 180         { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
 181         { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
 182         { "generation", &set_inode.i_generation, NULL, 4, parse_uint },
 183         /* Special case: i_file_acl_high is 2 bytes */
 184         { "file_acl", &set_inode.i_file_acl,
 185                 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
 186         { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint },
 187         { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
 188         { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint },
 189         { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
 190         { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
 191                 &set_inode.i_checksum_hi, 2, parse_uint },
 192         { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
 193                 4, parse_uint },
 194         { "extra_isize", &set_inode.i_extra_isize, NULL,
 195                 2, parse_uint },
 196         { "ctime_extra", &set_inode.i_ctime_extra, NULL,
 197                 4, parse_uint },
 198         { "mtime_extra", &set_inode.i_mtime_extra, NULL,
 199                 4, parse_uint },
 200         { "atime_extra", &set_inode.i_atime_extra, NULL,
 201                 4, parse_uint },
 202         { "crtime", &set_inode.i_crtime, NULL, 4, parse_uint },
 203         { "crtime_extra", &set_inode.i_crtime_extra, NULL,
 204                 4, parse_uint },
 205         { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
 206         { 0, 0, 0, 0 }
 207 };
 208
 209 static struct field_set_info ext2_bg_fields[] = {
 210         { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
 211         { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
 212         { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
 213         { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
 214         { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
 215         { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
 216         { "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
 217         { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
 218         { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
 219         { 0, 0, 0, 0 }
 220 };
 221
 222 static struct field_set_info ext4_bg_fields[] = {
 223         { "block_bitmap", &set_gd4.bg_block_bitmap,
 224                 &set_gd4.bg_block_bitmap_hi, 4, parse_uint },
 225         { "inode_bitmap", &set_gd4.bg_inode_bitmap,
 226                 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
 227         { "inode_table", &set_gd4.bg_inode_table,
 228                 &set_gd4.bg_inode_table_hi, 4, parse_uint },
 229         { "free_blocks_count", &set_gd4.bg_free_blocks_count,
 230                 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
 231         { "free_inodes_count", &set_gd4.bg_free_inodes_count,
 232                 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
 233         { "used_dirs_count", &set_gd4.bg_used_dirs_count,
 234                 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
 235         { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
 236         { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
 237                 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
 238         { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
 239                 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
 240         { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
 241                 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
 242         { "itable_unused", &set_gd4.bg_itable_unused,
 243                 &set_gd4.bg_itable_unused_hi, 2, parse_uint },
 244         { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
 245         { 0, 0, 0, 0 }
 246 };
 247
 248 static struct field_set_info mmp_fields[] = {
 249         { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear },
 250         { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
 251         { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
 252         { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
 253         { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
 254                 parse_string },
 255         { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
 256                 parse_string },
 257         { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
 258 };
 259
 260 static int check_suffix(const char *field)
 261 {
 262         int len = strlen(field);
 263
 264         if (len <= 3)
 265                 return 0;
 266         field += len-3;
 267         if (!strcmp(field, "_lo"))
 268                 return 1;
 269         if (!strcmp(field, "_hi"))
 270                 return 2;
 271         return 0;
 272 }
 273
 274 static struct field_set_info *find_field(struct field_set_info *fields,
 275                                          char *field)
 276 {
 277         struct field_set_info *ss;
 278         const char      *prefix;
 279         char            *arg, *delim, *idx, *tmp;
 280         int             suffix, prefix_len;
 281
 282         if (fields == super_fields)
 283                 prefix = "s_";
 284         else if (fields == inode_fields)
 285                 prefix = "i_";
 286         else
 287                 prefix = "bg_";
 288         prefix_len = strlen(prefix);
 289         if (strncmp(field, prefix, prefix_len) == 0)
 290                 field += prefix_len;
 291
 292         arg = malloc(strlen(field)+1);
 293         if (!arg)
 294                 return NULL;
 295         strcpy(arg, field);
 296
 297         idx = strchr(arg, '[');
 298         if (idx) {
 299                 *idx++ = 0;
 300                 delim = idx + strlen(idx) - 1;
 301                 if (!*idx || *delim != ']')
 302                         idx = 0;
 303                 else
 304                         *delim = 0;
 305         }
 306         /*
 307          * Can we parse the number?
 308          */
 309         if (idx) {
 310                 array_idx = strtol(idx, &tmp, 0);
 311                 if (*tmp)
 312                         idx = 0;
 313         }
 314
 315         /*
 316          * If there is a valid _hi or a _lo suffix, strip it off
 317          */
 318         suffix = check_suffix(arg);
 319         if (suffix > 0)
 320                 arg[strlen(arg)-3] = 0;
 321
 322         for (ss = fields ; ss->name ; ss++) {
 323                 if (suffix && ss->ptr2 == 0)
 324                         continue;
 325                 if (ss->flags & FLAG_ARRAY) {
 326                         if (!idx || (strcmp(ss->name, arg) != 0))
 327                                 continue;
 328                         if (ss->max_idx > 0 && array_idx >= ss->max_idx)
 329                                 continue;
 330                 } else {
 331                         if (strcmp(ss->name, arg) != 0)
 332                                 continue;
 333                 }
 334                 free(arg);
 335                 return ss;
 336         }
 337         free(arg);
 338         return NULL;
 339 }
 340
 341 /*
 342  * Note: info->size == 6 is special; this means a base size 4 bytes,
 343  * and secondiory (high) size of 2 bytes.  This is needed for the
 344  * special case of i_blocks_high and i_file_acl_high.
 345  */
 346 static errcode_t parse_uint(struct field_set_info *info, char *field,
 347                             char *arg)
 348 {
 349         unsigned long long n, num, mask, limit;
 350         int suffix = check_suffix(field);
 351         char *tmp;
 352         void *field1 = info->ptr, *field2 = info->ptr2;
 353         int size = (info->size == 6) ? 4 : info->size;
 354         union {
 355                 __u64   *ptr64;
 356                 __u32   *ptr32;
 357                 __u16   *ptr16;
 358                 __u8    *ptr8;
 359         } u;
 360
 361         if (suffix == 1)
 362                 field2 = 0;
 363         if (suffix == 2) {
 364                 field1 = field2;
 365                 field2 = 0;
 366         }
 367
 368         u.ptr8 = (__u8 *) field1;
 369         if (info->flags & FLAG_ARRAY)
 370                 u.ptr8 += array_idx * info->size;
 371
 372         errno = 0;
 373         num = STRTOULL(arg, &tmp, 0);
 374         if (*tmp || errno) {
 375                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 376                         arg, info->name);
 377                 return EINVAL;
 378         }
 379         mask = ~0ULL >> ((8 - size) * 8);
 380         limit = ~0ULL >> ((8 - info->size) * 8);
 381         if (field2 && info->size != 6)
 382                 limit = ~0ULL >> ((8 - info->size*2) * 8);
 383
 384         if (num > limit) {
 385                 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
 386                         arg, info->name, limit);
 387                 return EINVAL;
 388         }
 389         n = num & mask;
 390         switch (size) {
 391         case 8:
 392                 /* Should never get here */
 393                 fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
 394                         "defined; BUG?!?\n", info->name);
 395                 *u.ptr64 = 0;
 396                 break;
 397         case 4:
 398                 *u.ptr32 = n;
 399                 break;
 400         case 2:
 401                 *u.ptr16 = n;
 402                 break;
 403         case 1:
 404                 *u.ptr8 = n;
 405                 break;
 406         }
 407         if (!field2)
 408                 return 0;
 409         n = num >> (size*8);
 410         u.ptr8 = (__u8 *) field2;
 411         if (info->size == 6)
 412                 size = 2;
 413         switch (size) {
 414         case 8:
 415                 *u.ptr64 = n;
 416                 break;
 417         case 4:
 418                 *u.ptr32 = n;
 419                 break;
 420         case 2:
 421                 *u.ptr16 = n;
 422                 break;
 423         case 1:
 424                 *u.ptr8 = n;
 425                 break;
 426         }
 427         return 0;
 428 }
 429
 430 static errcode_t parse_int(struct field_set_info *info,
 431                            char *field EXT2FS_ATTR((unused)), char *arg)
 432 {
 433         long    num;
 434         char *tmp;
 435         __s32   *ptr32;
 436         __s16   *ptr16;
 437         __s8    *ptr8;
 438
 439         num = strtol(arg, &tmp, 0);
 440         if (*tmp) {
 441                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 442                         arg, info->name);
 443                 return EINVAL;
 444         }
 445         switch (info->size) {
 446         case 4:
 447                 ptr32 = (__s32 *) info->ptr;
 448                 *ptr32 = num;
 449                 break;
 450         case 2:
 451                 ptr16 = (__s16 *) info->ptr;
 452                 *ptr16 = num;
 453                 break;
 454         case 1:
 455                 ptr8 = (__s8 *) info->ptr;
 456                 *ptr8 = num;
 457                 break;
 458         }
 459         return 0;
 460 }
 461
 462 static errcode_t parse_string(struct field_set_info *info,
 463                               char *field EXT2FS_ATTR((unused)), char *arg)
 464 {
 465         char    *cp = (char *) info->ptr;
 466
 467         if (strlen(arg) >= info->size) {
 468                 fprintf(stderr, "Error maximum size for %s is %d.\n",
 469                         info->name, info->size);
 470                 return EINVAL;
 471         }
 472         strcpy(cp, arg);
 473         return 0;
 474 }
 475
 476 static errcode_t parse_time(struct field_set_info *info,
 477                             char *field EXT2FS_ATTR((unused)), char *arg)
 478 {
 479         time_t          t;
 480         __u32           *ptr32;
 481
 482         ptr32 = (__u32 *) info->ptr;
 483
 484         t = string_to_time(arg);
 485
 486         if (t == ((time_t) -1)) {
 487                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 488                         arg, info->name);
 489                 return EINVAL;
 490         }
 491         *ptr32 = t;
 492         return 0;
 493 }
 494
 495 static errcode_t parse_uuid(struct field_set_info *info,
 496                             char *field EXT2FS_ATTR((unused)), char *arg)
 497 {
 498         unsigned char * p = (unsigned char *) info->ptr;
 499
 500         if ((strcasecmp(arg, "null") == 0) ||
 501             (strcasecmp(arg, "clear") == 0)) {
 502                 uuid_clear(p);
 503         } else if (strcasecmp(arg, "time") == 0) {
 504                 uuid_generate_time(p);
 505         } else if (strcasecmp(arg, "random") == 0) {
 506                 uuid_generate(p);
 507         } else if (uuid_parse(arg, p)) {
 508                 fprintf(stderr, "Invalid UUID format: %s\n", arg);
 509                 return EINVAL;
 510         }
 511         return 0;
 512 }
 513
 514 static errcode_t parse_hashalg(struct field_set_info *info,
 515                                char *field EXT2FS_ATTR((unused)), char *arg)
 516 {
 517         int     hashv;
 518         unsigned char   *p = (unsigned char *) info->ptr;
 519
 520         hashv = e2p_string2hash(arg);
 521         if (hashv < 0) {
 522                 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
 523                 return EINVAL;
 524         }
 525         *p = hashv;
 526         return 0;
 527 }
 528
 529 static errcode_t parse_bmap(struct field_set_info *info,
 530                             char *field EXT2FS_ATTR((unused)), char *arg)
 531 {
 532         unsigned long   num;
 533         blk_t           blk;
 534         errcode_t       retval;
 535         char            *tmp;
 536
 537         num = strtoul(arg, &tmp, 0);
 538         if (*tmp) {
 539                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 540                         arg, info->name);
 541                 return EINVAL;
 542         }
 543         blk = num;
 544
 545         retval = ext2fs_bmap(current_fs, set_ino,
 546                              (struct ext2_inode *) &set_inode,
 547                              0, BMAP_SET, array_idx, &blk);
 548         if (retval) {
 549                 com_err("set_inode", retval, "while setting block map");
 550         }
 551         return retval;
 552 }
 553
 554 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
 555                                char *arg)
 556 {
 557
 558         if (strcmp(arg, "calc") == 0) {
 559                 ext2fs_group_desc_csum_set(current_fs, set_bg);
 560                 memcpy(&set_gd, ext2fs_group_desc(current_fs,
 561                                         current_fs->group_desc,
 562                                         set_bg),
 563                         sizeof(set_gd));
 564                 printf("Checksum set to 0x%04x\n",
 565                        ext2fs_bg_checksum(current_fs, set_bg));
 566                 return 0;
 567         }
 568
 569         return parse_uint(info, field, arg);
 570 }
 571
 572 static void print_possible_fields(struct field_set_info *fields)
 573 {
 574         struct field_set_info *ss;
 575         const char      *type, *cmd;
 576         FILE *f;
 577         char name[40], idx[40];
 578
 579         if (fields == super_fields) {
 580                 type = "Superblock";
 581                 cmd = "set_super_value";
 582         } else if (fields == inode_fields) {
 583                 type = "Inode";
 584                 cmd = "set_inode";
 585         } else if (fields == mmp_fields) {
 586                 type = "MMP";
 587                 cmd = "set_mmp_value";
 588         } else {
 589                 type = "Block group descriptor";
 590                 cmd = "set_block_group";
 591         }
 592         f = open_pager();
 593
 594         fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
 595
 596         for (ss = fields ; ss->name ; ss++) {
 597                 type = "unknown";
 598                 if (ss->func == parse_string)
 599                         type = "string";
 600                 else if (ss->func == parse_int)
 601                         type = "integer";
 602                 else if (ss->func == parse_uint)
 603                         type = "unsigned integer";
 604                 else if (ss->func == parse_uuid)
 605                         type = "UUID";
 606                 else if (ss->func == parse_hashalg)
 607                         type = "hash algorithm";
 608                 else if (ss->func == parse_time)
 609                         type = "date/time";
 610                 else if (ss->func == parse_bmap)
 611                         type = "set physical->logical block map";
 612                 else if (ss->func == parse_gd_csum)
 613                         type = "unsigned integer OR \"calc\"";
 614                 strcpy(name, ss->name);
 615                 if (ss->flags & FLAG_ARRAY) {
 616                         if (ss->max_idx > 0)
 617                                 sprintf(idx, "[%d]", ss->max_idx);
 618                         else
 619                                 strcpy(idx, "[]");
 620                         strcat(name, idx);
 621                 }
 622                 if (ss->ptr2)
 623                         strcat(name, "[_hi|_lo]");
 624                 fprintf(f, "\t%-25s\t%s\n", name, type);
 625         }
 626         close_pager(f);
 627 }
 628
 629
 630 void do_set_super(int argc, char *argv[])
 631 {
 632         const char *usage = "<field> <value>\n"
 633                 "\t\"set_super_value -l\" will list the names of "
 634                 "superblock fields\n\twhich can be set.";
 635         static struct field_set_info *ss;
 636
 637         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 638                 print_possible_fields(super_fields);
 639                 return;
 640         }
 641
 642         if (common_args_process(argc, argv, 3, 3, "set_super_value",
 643                                 usage, CHECK_FS_RW))
 644                 return;
 645
 646         if ((ss = find_field(super_fields, argv[1])) == 0) {
 647                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 648                 return;
 649         }
 650         set_sb = *current_fs->super;
 651         if (ss->func(ss, argv[1], argv[2]) == 0) {
 652                 *current_fs->super = set_sb;
 653                 ext2fs_mark_super_dirty(current_fs);
 654         }
 655 }
 656
 657 void do_set_inode(int argc, char *argv[])
 658 {
 659         const char *usage = "<inode> <field> <value>\n"
 660                 "\t\"set_inode_field -l\" will list the names of "
 661                 "the fields in an ext2 inode\n\twhich can be set.";
 662         static struct field_set_info *ss;
 663
 664         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 665                 print_possible_fields(inode_fields);
 666                 return;
 667         }
 668
 669         if (common_args_process(argc, argv, 4, 4, "set_inode",
 670                                 usage, CHECK_FS_RW))
 671                 return;
 672
 673         if ((ss = find_field(inode_fields, argv[2])) == 0) {
 674                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 675                 return;
 676         }
 677
 678         set_ino = string_to_inode(argv[1]);
 679         if (!set_ino)
 680                 return;
 681
 682         if (debugfs_read_inode_full(set_ino,
 683                         (struct ext2_inode *) &set_inode, argv[1],
 684                                     sizeof(set_inode)))
 685                 return;
 686
 687         if (ss->func(ss, argv[2], argv[3]) == 0) {
 688                 if (debugfs_write_inode_full(set_ino,
 689                              (struct ext2_inode *) &set_inode,
 690                              argv[1], sizeof(set_inode)))
 691                         return;
 692         }
 693 }
 694
 695 void do_set_block_group_descriptor(int argc, char *argv[])
 696 {
 697         const char *usage = "<bg number> <field> <value>\n"
 698                 "\t\"set_block_group_descriptor -l\" will list the names of "
 699                 "the fields in a block group descriptor\n\twhich can be set.";
 700         struct field_set_info   *table;
 701         struct field_set_info   *ss;
 702         char                    *end;
 703         void                    *edit, *target;
 704         int                     size;
 705
 706         /*
 707          *Determine whether we are editing an ext2 or ext4 block
 708          * group descriptor
 709          */
 710         if (current_fs && current_fs->super->s_feature_incompat &
 711             EXT4_FEATURE_INCOMPAT_64BIT) {
 712                 table = ext4_bg_fields;
 713                 edit = &set_gd4;
 714                 size = sizeof(set_gd4);
 715         } else {
 716                 table = ext2_bg_fields;
 717                 edit = &set_gd;
 718                 size = sizeof(set_gd);
 719         }
 720
 721         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 722                 print_possible_fields(table);
 723                 return;
 724         }
 725
 726         if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
 727                                 usage, CHECK_FS_RW))
 728                 return;
 729
 730         set_bg = strtoul(argv[1], &end, 0);
 731         if (*end) {
 732                 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
 733                 return;
 734         }
 735
 736         if (set_bg >= current_fs->group_desc_count) {
 737                 com_err(argv[0], 0, "block group number too big: %d", set_bg);
 738                 return;
 739         }
 740
 741         if ((ss = find_field(table, argv[2])) == 0) {
 742                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 743                 return;
 744         }
 745
 746         target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
 747         memcpy(edit, target, size);
 748         if (ss->func(ss, argv[2], argv[3]) == 0) {
 749                 memcpy(target, edit, size);
 750                 ext2fs_mark_super_dirty(current_fs);
 751         }
 752 }
 753
 754 static errcode_t parse_mmp_clear(struct field_set_info *info,
 755                                  char *field EXT2FS_ATTR((unused)),
 756                                  char *arg EXT2FS_ATTR((unused)))
 757 {
 758         errcode_t retval;
 759
 760         retval = ext2fs_mmp_clear(current_fs);
 761         if (retval != 0)
 762                 com_err("set_mmp_value", retval, "while clearing MMP block\n");
 763         else
 764                 memcpy(info->ptr, current_fs->mmp_buf, info->size);
 765
 766         return 1; /* we don't need the MMP block written again */
 767 }
 768
 769 void do_set_mmp_value(int argc, char *argv[])
 770 {
 771         const char *usage = "<field> <value>\n"
 772                 "\t\"set_mmp_value -l\" will list the names of "
 773                 "MMP fields\n\twhich can be set.";
 774         static struct field_set_info *smmp;
 775         struct mmp_struct *mmp_s;
 776         errcode_t retval;
 777
 778         if (argc == 2 && strcmp(argv[1], "-l") == 0) {
 779                 print_possible_fields(mmp_fields);
 780                 return;
 781         }
 782
 783         if (check_fs_open(argv[0]))
 784                 return;
 785
 786         if (current_fs->super->s_mmp_block == 0) {
 787                 com_err(argv[0], 0, "no MMP block allocated\n");
 788                 return;
 789         }
 790
 791         if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
 792                                 usage, CHECK_FS_RW))
 793                 return;
 794
 795         mmp_s = current_fs->mmp_buf;
 796         if (mmp_s == NULL) {
 797                 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
 798                 if (retval) {
 799                         com_err(argv[0], retval, "allocating MMP buffer\n");
 800                         return;
 801                 }
 802                 retval = ext2fs_mmp_read(current_fs,
 803                                          current_fs->super->s_mmp_block, mmp_s);
 804                 if (retval) {
 805                         com_err(argv[0], retval, "reading MMP block %llu.\n",
 806                                 (long long)current_fs->super->s_mmp_block);
 807                         ext2fs_free_mem(mmp_s);
 808                         return;
 809                 }
 810                 current_fs->mmp_buf = mmp_s;
 811         }
 812
 813         smmp = find_field(mmp_fields, argv[1]);
 814         if (smmp == 0) {
 815                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 816                 return;
 817         }
 818
 819         set_mmp = *mmp_s;
 820         if (smmp->func(smmp, argv[1], argv[2]) == 0) {
 821                 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
 822                                  &set_mmp);
 823                 *mmp_s = set_mmp;
 824         }
 825 }
 826