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         { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint },
 155         { 0, 0, 0, 0 }
 156 };
 157
 158 static struct field_set_info inode_fields[] = {
 159         { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
 160         { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
 161         { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
 162                 2, parse_uint },
 163         { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
 164         { "atime", &set_inode.i_atime, NULL, 4, parse_time },
 165         { "ctime", &set_inode.i_ctime, NULL, 4, parse_time },
 166         { "mtime", &set_inode.i_mtime, NULL, 4, parse_time },
 167         { "dtime", &set_inode.i_dtime, NULL, 4, parse_time },
 168         { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
 169                 2, parse_uint },
 170         { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
 171         /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
 172         { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
 173                 6, parse_uint },
 174         { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
 175         { "version", &set_inode.osd1.linux1.l_i_version,
 176                 &set_inode.i_version_hi, 4, parse_uint },
 177         { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint },
 178         { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
 179           EXT2_NDIR_BLOCKS },
 180         { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
 181         { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
 182         { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
 183         { "generation", &set_inode.i_generation, NULL, 4, parse_uint },
 184         /* Special case: i_file_acl_high is 2 bytes */
 185         { "file_acl", &set_inode.i_file_acl,
 186                 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
 187         { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint },
 188         { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
 189         { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint },
 190         { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
 191         { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
 192                 &set_inode.i_checksum_hi, 2, parse_uint },
 193         { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
 194                 4, parse_uint },
 195         { "extra_isize", &set_inode.i_extra_isize, NULL,
 196                 2, parse_uint },
 197         { "ctime_extra", &set_inode.i_ctime_extra, NULL,
 198                 4, parse_uint },
 199         { "mtime_extra", &set_inode.i_mtime_extra, NULL,
 200                 4, parse_uint },
 201         { "atime_extra", &set_inode.i_atime_extra, NULL,
 202                 4, parse_uint },
 203         { "crtime", &set_inode.i_crtime, NULL, 4, parse_uint },
 204         { "crtime_extra", &set_inode.i_crtime_extra, NULL,
 205                 4, parse_uint },
 206         { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
 207         { 0, 0, 0, 0 }
 208 };
 209
 210 static struct field_set_info ext2_bg_fields[] = {
 211         { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
 212         { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
 213         { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
 214         { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
 215         { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
 216         { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
 217         { "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
 218         { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
 219         { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
 220         { 0, 0, 0, 0 }
 221 };
 222
 223 static struct field_set_info ext4_bg_fields[] = {
 224         { "block_bitmap", &set_gd4.bg_block_bitmap,
 225                 &set_gd4.bg_block_bitmap_hi, 4, parse_uint },
 226         { "inode_bitmap", &set_gd4.bg_inode_bitmap,
 227                 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
 228         { "inode_table", &set_gd4.bg_inode_table,
 229                 &set_gd4.bg_inode_table_hi, 4, parse_uint },
 230         { "free_blocks_count", &set_gd4.bg_free_blocks_count,
 231                 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
 232         { "free_inodes_count", &set_gd4.bg_free_inodes_count,
 233                 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
 234         { "used_dirs_count", &set_gd4.bg_used_dirs_count,
 235                 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
 236         { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
 237         { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
 238                 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
 239         { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
 240                 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
 241         { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
 242                 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
 243         { "itable_unused", &set_gd4.bg_itable_unused,
 244                 &set_gd4.bg_itable_unused_hi, 2, parse_uint },
 245         { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
 246         { 0, 0, 0, 0 }
 247 };
 248
 249 static struct field_set_info mmp_fields[] = {
 250         { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear },
 251         { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
 252         { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
 253         { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
 254         { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
 255                 parse_string },
 256         { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
 257                 parse_string },
 258         { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
 259         { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
 260 };
 261
 262 static int check_suffix(const char *field)
 263 {
 264         int len = strlen(field);
 265
 266         if (len <= 3)
 267                 return 0;
 268         field += len-3;
 269         if (!strcmp(field, "_lo"))
 270                 return 1;
 271         if (!strcmp(field, "_hi"))
 272                 return 2;
 273         return 0;
 274 }
 275
 276 static struct field_set_info *find_field(struct field_set_info *fields,
 277                                          char *field)
 278 {
 279         struct field_set_info *ss;
 280         const char      *prefix;
 281         char            *arg, *delim, *idx, *tmp;
 282         int             suffix, prefix_len;
 283
 284         if (fields == super_fields)
 285                 prefix = "s_";
 286         else if (fields == inode_fields)
 287                 prefix = "i_";
 288         else
 289                 prefix = "bg_";
 290         prefix_len = strlen(prefix);
 291         if (strncmp(field, prefix, prefix_len) == 0)
 292                 field += prefix_len;
 293
 294         arg = malloc(strlen(field)+1);
 295         if (!arg)
 296                 return NULL;
 297         strcpy(arg, field);
 298
 299         idx = strchr(arg, '[');
 300         if (idx) {
 301                 *idx++ = 0;
 302                 delim = idx + strlen(idx) - 1;
 303                 if (!*idx || *delim != ']')
 304                         idx = 0;
 305                 else
 306                         *delim = 0;
 307         }
 308         /*
 309          * Can we parse the number?
 310          */
 311         if (idx) {
 312                 array_idx = strtol(idx, &tmp, 0);
 313                 if (*tmp)
 314                         idx = 0;
 315         }
 316
 317         /*
 318          * If there is a valid _hi or a _lo suffix, strip it off
 319          */
 320         suffix = check_suffix(arg);
 321         if (suffix > 0)
 322                 arg[strlen(arg)-3] = 0;
 323
 324         for (ss = fields ; ss->name ; ss++) {
 325                 if (suffix && ss->ptr2 == 0)
 326                         continue;
 327                 if (ss->flags & FLAG_ARRAY) {
 328                         if (!idx || (strcmp(ss->name, arg) != 0))
 329                                 continue;
 330                         if (ss->max_idx > 0 && array_idx >= ss->max_idx)
 331                                 continue;
 332                 } else {
 333                         if (strcmp(ss->name, arg) != 0)
 334                                 continue;
 335                 }
 336                 free(arg);
 337                 return ss;
 338         }
 339         free(arg);
 340         return NULL;
 341 }
 342
 343 /*
 344  * Note: info->size == 6 is special; this means a base size 4 bytes,
 345  * and secondiory (high) size of 2 bytes.  This is needed for the
 346  * special case of i_blocks_high and i_file_acl_high.
 347  */
 348 static errcode_t parse_uint(struct field_set_info *info, char *field,
 349                             char *arg)
 350 {
 351         unsigned long long n, num, mask, limit;
 352         int suffix = check_suffix(field);
 353         char *tmp;
 354         void *field1 = info->ptr, *field2 = info->ptr2;
 355         int size = (info->size == 6) ? 4 : info->size;
 356         union {
 357                 __u64   *ptr64;
 358                 __u32   *ptr32;
 359                 __u16   *ptr16;
 360                 __u8    *ptr8;
 361         } u;
 362
 363         if (suffix == 1)
 364                 field2 = 0;
 365         if (suffix == 2) {
 366                 field1 = field2;
 367                 field2 = 0;
 368         }
 369
 370         u.ptr8 = (__u8 *) field1;
 371         if (info->flags & FLAG_ARRAY)
 372                 u.ptr8 += array_idx * info->size;
 373
 374         errno = 0;
 375         num = STRTOULL(arg, &tmp, 0);
 376         if (*tmp || errno) {
 377                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 378                         arg, info->name);
 379                 return EINVAL;
 380         }
 381         mask = ~0ULL >> ((8 - size) * 8);
 382         limit = ~0ULL >> ((8 - info->size) * 8);
 383         if (field2 && info->size != 6)
 384                 limit = ~0ULL >> ((8 - info->size*2) * 8);
 385
 386         if (num > limit) {
 387                 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
 388                         arg, info->name, limit);
 389                 return EINVAL;
 390         }
 391         n = num & mask;
 392         switch (size) {
 393         case 8:
 394                 *u.ptr64 = n;
 395                 break;
 396         case 4:
 397                 *u.ptr32 = n;
 398                 break;
 399         case 2:
 400                 *u.ptr16 = n;
 401                 break;
 402         case 1:
 403                 *u.ptr8 = n;
 404                 break;
 405         }
 406         if (!field2)
 407                 return 0;
 408         n = num >> (size*8);
 409         u.ptr8 = (__u8 *) field2;
 410         if (info->size == 6)
 411                 size = 2;
 412         switch (size) {
 413         case 8:
 414                 *u.ptr64 = n;
 415                 break;
 416         case 4:
 417                 *u.ptr32 = n;
 418                 break;
 419         case 2:
 420                 *u.ptr16 = n;
 421                 break;
 422         case 1:
 423                 *u.ptr8 = n;
 424                 break;
 425         }
 426         return 0;
 427 }
 428
 429 static errcode_t parse_int(struct field_set_info *info,
 430                            char *field EXT2FS_ATTR((unused)), char *arg)
 431 {
 432         long    num;
 433         char *tmp;
 434         __s32   *ptr32;
 435         __s16   *ptr16;
 436         __s8    *ptr8;
 437
 438         num = strtol(arg, &tmp, 0);
 439         if (*tmp) {
 440                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 441                         arg, info->name);
 442                 return EINVAL;
 443         }
 444         switch (info->size) {
 445         case 4:
 446                 ptr32 = (__s32 *) info->ptr;
 447                 *ptr32 = num;
 448                 break;
 449         case 2:
 450                 ptr16 = (__s16 *) info->ptr;
 451                 *ptr16 = num;
 452                 break;
 453         case 1:
 454                 ptr8 = (__s8 *) info->ptr;
 455                 *ptr8 = num;
 456                 break;
 457         }
 458         return 0;
 459 }
 460
 461 static errcode_t parse_string(struct field_set_info *info,
 462                               char *field EXT2FS_ATTR((unused)), char *arg)
 463 {
 464         char    *cp = (char *) info->ptr;
 465
 466         if (strlen(arg) >= info->size) {
 467                 fprintf(stderr, "Error maximum size for %s is %d.\n",
 468                         info->name, info->size);
 469                 return EINVAL;
 470         }
 471         strcpy(cp, arg);
 472         return 0;
 473 }
 474
 475 static errcode_t parse_time(struct field_set_info *info,
 476                             char *field EXT2FS_ATTR((unused)), char *arg)
 477 {
 478         time_t          t;
 479         __u32           *ptr32;
 480
 481         ptr32 = (__u32 *) info->ptr;
 482
 483         t = string_to_time(arg);
 484
 485         if (t == ((time_t) -1)) {
 486                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 487                         arg, info->name);
 488                 return EINVAL;
 489         }
 490         *ptr32 = t;
 491         return 0;
 492 }
 493
 494 static errcode_t parse_uuid(struct field_set_info *info,
 495                             char *field EXT2FS_ATTR((unused)), char *arg)
 496 {
 497         unsigned char * p = (unsigned char *) info->ptr;
 498
 499         if ((strcasecmp(arg, "null") == 0) ||
 500             (strcasecmp(arg, "clear") == 0)) {
 501                 uuid_clear(p);
 502         } else if (strcasecmp(arg, "time") == 0) {
 503                 uuid_generate_time(p);
 504         } else if (strcasecmp(arg, "random") == 0) {
 505                 uuid_generate(p);
 506         } else if (uuid_parse(arg, p)) {
 507                 fprintf(stderr, "Invalid UUID format: %s\n", arg);
 508                 return EINVAL;
 509         }
 510         return 0;
 511 }
 512
 513 static errcode_t parse_hashalg(struct field_set_info *info,
 514                                char *field EXT2FS_ATTR((unused)), char *arg)
 515 {
 516         int     hashv;
 517         unsigned char   *p = (unsigned char *) info->ptr;
 518
 519         hashv = e2p_string2hash(arg);
 520         if (hashv < 0) {
 521                 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
 522                 return EINVAL;
 523         }
 524         *p = hashv;
 525         return 0;
 526 }
 527
 528 static errcode_t parse_bmap(struct field_set_info *info,
 529                             char *field EXT2FS_ATTR((unused)), char *arg)
 530 {
 531         unsigned long   num;
 532         blk_t           blk;
 533         errcode_t       retval;
 534         char            *tmp;
 535
 536         num = strtoul(arg, &tmp, 0);
 537         if (*tmp) {
 538                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 539                         arg, info->name);
 540                 return EINVAL;
 541         }
 542         blk = num;
 543
 544         retval = ext2fs_bmap(current_fs, set_ino,
 545                              (struct ext2_inode *) &set_inode,
 546                              0, BMAP_SET, array_idx, &blk);
 547         if (retval) {
 548                 com_err("set_inode", retval, "while setting block map");
 549         }
 550         return retval;
 551 }
 552
 553 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
 554                                char *arg)
 555 {
 556
 557         if (strcmp(arg, "calc") == 0) {
 558                 ext2fs_group_desc_csum_set(current_fs, set_bg);
 559                 memcpy(&set_gd, ext2fs_group_desc(current_fs,
 560                                         current_fs->group_desc,
 561                                         set_bg),
 562                         sizeof(set_gd));
 563                 printf("Checksum set to 0x%04x\n",
 564                        ext2fs_bg_checksum(current_fs, set_bg));
 565                 return 0;
 566         }
 567
 568         return parse_uint(info, field, arg);
 569 }
 570
 571 static void print_possible_fields(struct field_set_info *fields)
 572 {
 573         struct field_set_info *ss;
 574         const char      *type, *cmd;
 575         FILE *f;
 576         char name[40], idx[40];
 577
 578         if (fields == super_fields) {
 579                 type = "Superblock";
 580                 cmd = "set_super_value";
 581         } else if (fields == inode_fields) {
 582                 type = "Inode";
 583                 cmd = "set_inode";
 584         } else if (fields == mmp_fields) {
 585                 type = "MMP";
 586                 cmd = "set_mmp_value";
 587         } else {
 588                 type = "Block group descriptor";
 589                 cmd = "set_block_group";
 590         }
 591         f = open_pager();
 592
 593         fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
 594
 595         for (ss = fields ; ss->name ; ss++) {
 596                 type = "unknown";
 597                 if (ss->func == parse_string)
 598                         type = "string";
 599                 else if (ss->func == parse_int)
 600                         type = "integer";
 601                 else if (ss->func == parse_uint)
 602                         type = "unsigned integer";
 603                 else if (ss->func == parse_uuid)
 604                         type = "UUID";
 605                 else if (ss->func == parse_hashalg)
 606                         type = "hash algorithm";
 607                 else if (ss->func == parse_time)
 608                         type = "date/time";
 609                 else if (ss->func == parse_bmap)
 610                         type = "set physical->logical block map";
 611                 else if (ss->func == parse_gd_csum)
 612                         type = "unsigned integer OR \"calc\"";
 613                 strcpy(name, ss->name);
 614                 if (ss->flags & FLAG_ARRAY) {
 615                         if (ss->max_idx > 0)
 616                                 sprintf(idx, "[%d]", ss->max_idx);
 617                         else
 618                                 strcpy(idx, "[]");
 619                         strcat(name, idx);
 620                 }
 621                 if (ss->ptr2)
 622                         strcat(name, "[_hi|_lo]");
 623                 fprintf(f, "\t%-25s\t%s\n", name, type);
 624         }
 625         close_pager(f);
 626 }
 627
 628
 629 void do_set_super(int argc, char *argv[])
 630 {
 631         const char *usage = "<field> <value>\n"
 632                 "\t\"set_super_value -l\" will list the names of "
 633                 "superblock fields\n\twhich can be set.";
 634         static struct field_set_info *ss;
 635
 636         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 637                 print_possible_fields(super_fields);
 638                 return;
 639         }
 640
 641         if (common_args_process(argc, argv, 3, 3, "set_super_value",
 642                                 usage, CHECK_FS_RW))
 643                 return;
 644
 645         if ((ss = find_field(super_fields, argv[1])) == 0) {
 646                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 647                 return;
 648         }
 649         set_sb = *current_fs->super;
 650         if (ss->func(ss, argv[1], argv[2]) == 0) {
 651                 *current_fs->super = set_sb;
 652                 ext2fs_mark_super_dirty(current_fs);
 653         }
 654 }
 655
 656 void do_set_inode(int argc, char *argv[])
 657 {
 658         const char *usage = "<inode> <field> <value>\n"
 659                 "\t\"set_inode_field -l\" will list the names of "
 660                 "the fields in an ext2 inode\n\twhich can be set.";
 661         static struct field_set_info *ss;
 662
 663         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 664                 print_possible_fields(inode_fields);
 665                 return;
 666         }
 667
 668         if (common_args_process(argc, argv, 4, 4, "set_inode",
 669                                 usage, CHECK_FS_RW))
 670                 return;
 671
 672         if ((ss = find_field(inode_fields, argv[2])) == 0) {
 673                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 674                 return;
 675         }
 676
 677         set_ino = string_to_inode(argv[1]);
 678         if (!set_ino)
 679                 return;
 680
 681         if (debugfs_read_inode_full(set_ino,
 682                         (struct ext2_inode *) &set_inode, argv[1],
 683                                     sizeof(set_inode)))
 684                 return;
 685
 686         if (ss->func(ss, argv[2], argv[3]) == 0) {
 687                 if (debugfs_write_inode_full(set_ino,
 688                              (struct ext2_inode *) &set_inode,
 689                              argv[1], sizeof(set_inode)))
 690                         return;
 691         }
 692 }
 693
 694 void do_set_block_group_descriptor(int argc, char *argv[])
 695 {
 696         const char *usage = "<bg number> <field> <value>\n"
 697                 "\t\"set_block_group_descriptor -l\" will list the names of "
 698                 "the fields in a block group descriptor\n\twhich can be set.";
 699         struct field_set_info   *table;
 700         struct field_set_info   *ss;
 701         char                    *end;
 702         void                    *edit, *target;
 703         int                     size;
 704
 705         /*
 706          *Determine whether we are editing an ext2 or ext4 block
 707          * group descriptor
 708          */
 709         if (current_fs && current_fs->super->s_feature_incompat &
 710             EXT4_FEATURE_INCOMPAT_64BIT) {
 711                 table = ext4_bg_fields;
 712                 edit = &set_gd4;
 713                 size = sizeof(set_gd4);
 714         } else {
 715                 table = ext2_bg_fields;
 716                 edit = &set_gd;
 717                 size = sizeof(set_gd);
 718         }
 719
 720         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 721                 print_possible_fields(table);
 722                 return;
 723         }
 724
 725         if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
 726                                 usage, CHECK_FS_RW))
 727                 return;
 728
 729         set_bg = strtoul(argv[1], &end, 0);
 730         if (*end) {
 731                 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
 732                 return;
 733         }
 734
 735         if (set_bg >= current_fs->group_desc_count) {
 736                 com_err(argv[0], 0, "block group number too big: %d", set_bg);
 737                 return;
 738         }
 739
 740         if ((ss = find_field(table, argv[2])) == 0) {
 741                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 742                 return;
 743         }
 744
 745         target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
 746         memcpy(edit, target, size);
 747         if (ss->func(ss, argv[2], argv[3]) == 0) {
 748                 memcpy(target, edit, size);
 749                 ext2fs_mark_super_dirty(current_fs);
 750         }
 751 }
 752
 753 static errcode_t parse_mmp_clear(struct field_set_info *info,
 754                                  char *field EXT2FS_ATTR((unused)),
 755                                  char *arg EXT2FS_ATTR((unused)))
 756 {
 757         errcode_t retval;
 758
 759         retval = ext2fs_mmp_clear(current_fs);
 760         if (retval != 0)
 761                 com_err("set_mmp_value", retval, "while clearing MMP block\n");
 762         else
 763                 memcpy(info->ptr, current_fs->mmp_buf, info->size);
 764
 765         return 1; /* we don't need the MMP block written again */
 766 }
 767
 768 void do_set_mmp_value(int argc, char *argv[])
 769 {
 770 #ifdef CONFIG_MMP
 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 #else
 826         fprintf(stdout, "MMP is unsupported, please recompile with "
 827                         "--enable-mmp\n");
 828 #endif
 829 }
 830