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         { "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint,
 154           FLAG_ARRAY, 2 },
 155         { "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
 156         { "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint },
 157         { 0, 0, 0, 0 }
 158 };
 159
 160 static struct field_set_info inode_fields[] = {
 161         { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
 162         { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
 163         { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
 164                 2, parse_uint },
 165         { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
 166         { "atime", &set_inode.i_atime, NULL, 4, parse_time },
 167         { "ctime", &set_inode.i_ctime, NULL, 4, parse_time },
 168         { "mtime", &set_inode.i_mtime, NULL, 4, parse_time },
 169         { "dtime", &set_inode.i_dtime, NULL, 4, parse_time },
 170         { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
 171                 2, parse_uint },
 172         { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
 173         /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
 174         { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
 175                 6, parse_uint },
 176         { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
 177         { "version", &set_inode.osd1.linux1.l_i_version,
 178                 &set_inode.i_version_hi, 4, parse_uint },
 179         { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint },
 180         { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
 181           EXT2_NDIR_BLOCKS },
 182         { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
 183         { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
 184         { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
 185         { "generation", &set_inode.i_generation, NULL, 4, parse_uint },
 186         /* Special case: i_file_acl_high is 2 bytes */
 187         { "file_acl", &set_inode.i_file_acl,
 188                 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
 189         { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint },
 190         { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
 191         { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint },
 192         { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
 193         { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
 194                 &set_inode.i_checksum_hi, 2, parse_uint },
 195         { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
 196                 4, parse_uint },
 197         { "extra_isize", &set_inode.i_extra_isize, NULL,
 198                 2, parse_uint },
 199         { "ctime_extra", &set_inode.i_ctime_extra, NULL,
 200                 4, parse_uint },
 201         { "mtime_extra", &set_inode.i_mtime_extra, NULL,
 202                 4, parse_uint },
 203         { "atime_extra", &set_inode.i_atime_extra, NULL,
 204                 4, parse_uint },
 205         { "crtime", &set_inode.i_crtime, NULL, 4, parse_uint },
 206         { "crtime_extra", &set_inode.i_crtime_extra, NULL,
 207                 4, parse_uint },
 208         { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
 209         { 0, 0, 0, 0 }
 210 };
 211
 212 static struct field_set_info ext2_bg_fields[] = {
 213         { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
 214         { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
 215         { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
 216         { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
 217         { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
 218         { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
 219         { "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
 220         { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
 221         { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
 222         { 0, 0, 0, 0 }
 223 };
 224
 225 static struct field_set_info ext4_bg_fields[] = {
 226         { "block_bitmap", &set_gd4.bg_block_bitmap,
 227                 &set_gd4.bg_block_bitmap_hi, 4, parse_uint },
 228         { "inode_bitmap", &set_gd4.bg_inode_bitmap,
 229                 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
 230         { "inode_table", &set_gd4.bg_inode_table,
 231                 &set_gd4.bg_inode_table_hi, 4, parse_uint },
 232         { "free_blocks_count", &set_gd4.bg_free_blocks_count,
 233                 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
 234         { "free_inodes_count", &set_gd4.bg_free_inodes_count,
 235                 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
 236         { "used_dirs_count", &set_gd4.bg_used_dirs_count,
 237                 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
 238         { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
 239         { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
 240                 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
 241         { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
 242                 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
 243         { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
 244                 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
 245         { "itable_unused", &set_gd4.bg_itable_unused,
 246                 &set_gd4.bg_itable_unused_hi, 2, parse_uint },
 247         { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
 248         { 0, 0, 0, 0 }
 249 };
 250
 251 static struct field_set_info mmp_fields[] = {
 252         { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear },
 253         { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
 254         { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
 255         { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
 256         { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
 257                 parse_string },
 258         { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
 259                 parse_string },
 260         { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
 261         { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
 262 };
 263
 264 static int check_suffix(const char *field)
 265 {
 266         int len = strlen(field);
 267
 268         if (len <= 3)
 269                 return 0;
 270         field += len-3;
 271         if (!strcmp(field, "_lo"))
 272                 return 1;
 273         if (!strcmp(field, "_hi"))
 274                 return 2;
 275         return 0;
 276 }
 277
 278 static struct field_set_info *find_field(struct field_set_info *fields,
 279                                          char *field)
 280 {
 281         struct field_set_info *ss;
 282         const char      *prefix;
 283         char            *arg, *delim, *idx, *tmp;
 284         int             suffix, prefix_len;
 285
 286         if (fields == super_fields)
 287                 prefix = "s_";
 288         else if (fields == inode_fields)
 289                 prefix = "i_";
 290         else
 291                 prefix = "bg_";
 292         prefix_len = strlen(prefix);
 293         if (strncmp(field, prefix, prefix_len) == 0)
 294                 field += prefix_len;
 295
 296         arg = malloc(strlen(field)+1);
 297         if (!arg)
 298                 return NULL;
 299         strcpy(arg, field);
 300
 301         idx = strchr(arg, '[');
 302         if (idx) {
 303                 *idx++ = 0;
 304                 delim = idx + strlen(idx) - 1;
 305                 if (!*idx || *delim != ']')
 306                         idx = 0;
 307                 else
 308                         *delim = 0;
 309         }
 310         /*
 311          * Can we parse the number?
 312          */
 313         if (idx) {
 314                 array_idx = strtol(idx, &tmp, 0);
 315                 if (*tmp)
 316                         idx = 0;
 317         }
 318
 319         /*
 320          * If there is a valid _hi or a _lo suffix, strip it off
 321          */
 322         suffix = check_suffix(arg);
 323         if (suffix > 0)
 324                 arg[strlen(arg)-3] = 0;
 325
 326         for (ss = fields ; ss->name ; ss++) {
 327                 if (suffix && ss->ptr2 == 0)
 328                         continue;
 329                 if (ss->flags & FLAG_ARRAY) {
 330                         if (!idx || (strcmp(ss->name, arg) != 0))
 331                                 continue;
 332                         if (ss->max_idx > 0 && array_idx >= ss->max_idx)
 333                                 continue;
 334                 } else {
 335                         if (strcmp(ss->name, arg) != 0)
 336                                 continue;
 337                 }
 338                 free(arg);
 339                 return ss;
 340         }
 341         free(arg);
 342         return NULL;
 343 }
 344
 345 /*
 346  * Note: info->size == 6 is special; this means a base size 4 bytes,
 347  * and secondiory (high) size of 2 bytes.  This is needed for the
 348  * special case of i_blocks_high and i_file_acl_high.
 349  */
 350 static errcode_t parse_uint(struct field_set_info *info, char *field,
 351                             char *arg)
 352 {
 353         unsigned long long n, num, mask, limit;
 354         int suffix = check_suffix(field);
 355         char *tmp;
 356         void *field1 = info->ptr, *field2 = info->ptr2;
 357         int size = (info->size == 6) ? 4 : info->size;
 358         union {
 359                 __u64   *ptr64;
 360                 __u32   *ptr32;
 361                 __u16   *ptr16;
 362                 __u8    *ptr8;
 363         } u;
 364
 365         if (suffix == 1)
 366                 field2 = 0;
 367         if (suffix == 2) {
 368                 field1 = field2;
 369                 field2 = 0;
 370         }
 371
 372         u.ptr8 = (__u8 *) field1;
 373         if (info->flags & FLAG_ARRAY)
 374                 u.ptr8 += array_idx * info->size;
 375
 376         errno = 0;
 377         num = STRTOULL(arg, &tmp, 0);
 378         if (*tmp || errno) {
 379                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 380                         arg, info->name);
 381                 return EINVAL;
 382         }
 383         mask = ~0ULL >> ((8 - size) * 8);
 384         limit = ~0ULL >> ((8 - info->size) * 8);
 385         if (field2 && info->size != 6)
 386                 limit = ~0ULL >> ((8 - info->size*2) * 8);
 387
 388         if (num > limit) {
 389                 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
 390                         arg, info->name, limit);
 391                 return EINVAL;
 392         }
 393         n = num & mask;
 394         switch (size) {
 395         case 8:
 396                 /* Should never get here */
 397                 fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
 398                         "defined; BUG?!?\n", info->name);
 399                 *u.ptr64 = 0;
 400                 break;
 401         case 4:
 402                 *u.ptr32 = n;
 403                 break;
 404         case 2:
 405                 *u.ptr16 = n;
 406                 break;
 407         case 1:
 408                 *u.ptr8 = n;
 409                 break;
 410         }
 411         if (!field2)
 412                 return 0;
 413         n = num >> (size*8);
 414         u.ptr8 = (__u8 *) field2;
 415         if (info->size == 6)
 416                 size = 2;
 417         switch (size) {
 418         case 8:
 419                 *u.ptr64 = n;
 420                 break;
 421         case 4:
 422                 *u.ptr32 = n;
 423                 break;
 424         case 2:
 425                 *u.ptr16 = n;
 426                 break;
 427         case 1:
 428                 *u.ptr8 = n;
 429                 break;
 430         }
 431         return 0;
 432 }
 433
 434 static errcode_t parse_int(struct field_set_info *info,
 435                            char *field EXT2FS_ATTR((unused)), char *arg)
 436 {
 437         long    num;
 438         char *tmp;
 439         __s32   *ptr32;
 440         __s16   *ptr16;
 441         __s8    *ptr8;
 442
 443         num = strtol(arg, &tmp, 0);
 444         if (*tmp) {
 445                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 446                         arg, info->name);
 447                 return EINVAL;
 448         }
 449         switch (info->size) {
 450         case 4:
 451                 ptr32 = (__s32 *) info->ptr;
 452                 *ptr32 = num;
 453                 break;
 454         case 2:
 455                 ptr16 = (__s16 *) info->ptr;
 456                 *ptr16 = num;
 457                 break;
 458         case 1:
 459                 ptr8 = (__s8 *) info->ptr;
 460                 *ptr8 = num;
 461                 break;
 462         }
 463         return 0;
 464 }
 465
 466 static errcode_t parse_string(struct field_set_info *info,
 467                               char *field EXT2FS_ATTR((unused)), char *arg)
 468 {
 469         char    *cp = (char *) info->ptr;
 470
 471         if (strlen(arg) >= info->size) {
 472                 fprintf(stderr, "Error maximum size for %s is %d.\n",
 473                         info->name, info->size);
 474                 return EINVAL;
 475         }
 476         strcpy(cp, arg);
 477         return 0;
 478 }
 479
 480 static errcode_t parse_time(struct field_set_info *info,
 481                             char *field EXT2FS_ATTR((unused)), char *arg)
 482 {
 483         time_t          t;
 484         __u32           *ptr32;
 485
 486         ptr32 = (__u32 *) info->ptr;
 487
 488         t = string_to_time(arg);
 489
 490         if (t == ((time_t) -1)) {
 491                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 492                         arg, info->name);
 493                 return EINVAL;
 494         }
 495         *ptr32 = t;
 496         return 0;
 497 }
 498
 499 static errcode_t parse_uuid(struct field_set_info *info,
 500                             char *field EXT2FS_ATTR((unused)), char *arg)
 501 {
 502         unsigned char * p = (unsigned char *) info->ptr;
 503
 504         if ((strcasecmp(arg, "null") == 0) ||
 505             (strcasecmp(arg, "clear") == 0)) {
 506                 uuid_clear(p);
 507         } else if (strcasecmp(arg, "time") == 0) {
 508                 uuid_generate_time(p);
 509         } else if (strcasecmp(arg, "random") == 0) {
 510                 uuid_generate(p);
 511         } else if (uuid_parse(arg, p)) {
 512                 fprintf(stderr, "Invalid UUID format: %s\n", arg);
 513                 return EINVAL;
 514         }
 515         return 0;
 516 }
 517
 518 static errcode_t parse_hashalg(struct field_set_info *info,
 519                                char *field EXT2FS_ATTR((unused)), char *arg)
 520 {
 521         int     hashv;
 522         unsigned char   *p = (unsigned char *) info->ptr;
 523
 524         hashv = e2p_string2hash(arg);
 525         if (hashv < 0) {
 526                 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
 527                 return EINVAL;
 528         }
 529         *p = hashv;
 530         return 0;
 531 }
 532
 533 static errcode_t parse_bmap(struct field_set_info *info,
 534                             char *field EXT2FS_ATTR((unused)), char *arg)
 535 {
 536         blk64_t         blk;
 537         errcode_t       retval;
 538         char            *tmp;
 539
 540         blk = strtoull(arg, &tmp, 0);
 541         if (*tmp) {
 542                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 543                         arg, info->name);
 544                 return EINVAL;
 545         }
 546
 547         retval = ext2fs_bmap2(current_fs, set_ino,
 548                              (struct ext2_inode *) &set_inode,
 549                              NULL, BMAP_SET, array_idx, NULL, &blk);
 550         if (retval) {
 551                 com_err("set_inode", retval, "while setting block map");
 552         }
 553         return retval;
 554 }
 555
 556 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
 557                                char *arg)
 558 {
 559
 560         if (strcmp(arg, "calc") == 0) {
 561                 ext2fs_group_desc_csum_set(current_fs, set_bg);
 562                 memcpy(&set_gd, ext2fs_group_desc(current_fs,
 563                                         current_fs->group_desc,
 564                                         set_bg),
 565                         sizeof(set_gd));
 566                 printf("Checksum set to 0x%04x\n",
 567                        ext2fs_bg_checksum(current_fs, set_bg));
 568                 return 0;
 569         }
 570
 571         return parse_uint(info, field, arg);
 572 }
 573
 574 static void print_possible_fields(struct field_set_info *fields)
 575 {
 576         struct field_set_info *ss;
 577         const char      *type, *cmd;
 578         FILE *f;
 579         char name[40], idx[40];
 580
 581         if (fields == super_fields) {
 582                 type = "Superblock";
 583                 cmd = "set_super_value";
 584         } else if (fields == inode_fields) {
 585                 type = "Inode";
 586                 cmd = "set_inode";
 587         } else if (fields == mmp_fields) {
 588                 type = "MMP";
 589                 cmd = "set_mmp_value";
 590         } else {
 591                 type = "Block group descriptor";
 592                 cmd = "set_block_group";
 593         }
 594         f = open_pager();
 595
 596         fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
 597
 598         for (ss = fields ; ss->name ; ss++) {
 599                 type = "unknown";
 600                 if (ss->func == parse_string)
 601                         type = "string";
 602                 else if (ss->func == parse_int)
 603                         type = "integer";
 604                 else if (ss->func == parse_uint)
 605                         type = "unsigned integer";
 606                 else if (ss->func == parse_uuid)
 607                         type = "UUID";
 608                 else if (ss->func == parse_hashalg)
 609                         type = "hash algorithm";
 610                 else if (ss->func == parse_time)
 611                         type = "date/time";
 612                 else if (ss->func == parse_bmap)
 613                         type = "set physical->logical block map";
 614                 else if (ss->func == parse_gd_csum)
 615                         type = "unsigned integer OR \"calc\"";
 616                 strcpy(name, ss->name);
 617                 if (ss->flags & FLAG_ARRAY) {
 618                         if (ss->max_idx > 0)
 619                                 sprintf(idx, "[%d]", ss->max_idx);
 620                         else
 621                                 strcpy(idx, "[]");
 622                         strcat(name, idx);
 623                 }
 624                 if (ss->ptr2)
 625                         strcat(name, "[_hi|_lo]");
 626                 fprintf(f, "\t%-25s\t%s\n", name, type);
 627         }
 628         close_pager(f);
 629 }
 630
 631
 632 void do_set_super(int argc, char *argv[])
 633 {
 634         const char *usage = "<field> <value>\n"
 635                 "\t\"set_super_value -l\" will list the names of "
 636                 "superblock fields\n\twhich can be set.";
 637         static struct field_set_info *ss;
 638
 639         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 640                 print_possible_fields(super_fields);
 641                 return;
 642         }
 643
 644         if (common_args_process(argc, argv, 3, 3, "set_super_value",
 645                                 usage, CHECK_FS_RW))
 646                 return;
 647
 648         if ((ss = find_field(super_fields, argv[1])) == 0) {
 649                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 650                 return;
 651         }
 652         set_sb = *current_fs->super;
 653         if (ss->func(ss, argv[1], argv[2]) == 0) {
 654                 *current_fs->super = set_sb;
 655                 ext2fs_mark_super_dirty(current_fs);
 656         }
 657 }
 658
 659 void do_set_inode(int argc, char *argv[])
 660 {
 661         const char *usage = "<inode> <field> <value>\n"
 662                 "\t\"set_inode_field -l\" will list the names of "
 663                 "the fields in an ext2 inode\n\twhich can be set.";
 664         static struct field_set_info *ss;
 665
 666         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 667                 print_possible_fields(inode_fields);
 668                 return;
 669         }
 670
 671         if (common_args_process(argc, argv, 4, 4, "set_inode",
 672                                 usage, CHECK_FS_RW))
 673                 return;
 674
 675         if ((ss = find_field(inode_fields, argv[2])) == 0) {
 676                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 677                 return;
 678         }
 679
 680         set_ino = string_to_inode(argv[1]);
 681         if (!set_ino)
 682                 return;
 683
 684         if (debugfs_read_inode_full(set_ino,
 685                         (struct ext2_inode *) &set_inode, argv[1],
 686                                     sizeof(set_inode)))
 687                 return;
 688
 689         if (ss->func(ss, argv[2], argv[3]) == 0) {
 690                 if (debugfs_write_inode_full(set_ino,
 691                              (struct ext2_inode *) &set_inode,
 692                              argv[1], sizeof(set_inode)))
 693                         return;
 694         }
 695 }
 696
 697 void do_set_block_group_descriptor(int argc, char *argv[])
 698 {
 699         const char *usage = "<bg number> <field> <value>\n"
 700                 "\t\"set_block_group_descriptor -l\" will list the names of "
 701                 "the fields in a block group descriptor\n\twhich can be set.";
 702         struct field_set_info   *table;
 703         struct field_set_info   *ss;
 704         char                    *end;
 705         void                    *edit, *target;
 706         int                     size;
 707
 708         /*
 709          * Determine whether we are editing an ext2 or ext4 block group
 710          * descriptor.  Descriptors larger than ext4_group_desc cannot
 711          * have their fields edited yet, because they do not have any
 712          * names assigned.  When that happens, this function needs to
 713          * be updated for the new descriptor struct and fields.
 714          */
 715         if (current_fs &&
 716             EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) {
 717                 table = ext4_bg_fields;
 718                 edit = &set_gd4;
 719                 size = sizeof(set_gd4);
 720         } else {
 721                 table = ext2_bg_fields;
 722                 edit = &set_gd;
 723                 size = sizeof(set_gd);
 724         }
 725
 726         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 727                 print_possible_fields(table);
 728                 return;
 729         }
 730
 731         if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
 732                                 usage, CHECK_FS_RW))
 733                 return;
 734
 735         set_bg = strtoul(argv[1], &end, 0);
 736         if (*end) {
 737                 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
 738                 return;
 739         }
 740
 741         if (set_bg >= current_fs->group_desc_count) {
 742                 com_err(argv[0], 0, "block group number too big: %d", set_bg);
 743                 return;
 744         }
 745
 746         if ((ss = find_field(table, argv[2])) == 0) {
 747                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 748                 return;
 749         }
 750
 751         target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
 752         memcpy(edit, target, size);
 753         if (ss->func(ss, argv[2], argv[3]) == 0) {
 754                 memcpy(target, edit, size);
 755                 ext2fs_mark_super_dirty(current_fs);
 756         }
 757 }
 758
 759 static errcode_t parse_mmp_clear(struct field_set_info *info,
 760                                  char *field EXT2FS_ATTR((unused)),
 761                                  char *arg EXT2FS_ATTR((unused)))
 762 {
 763         errcode_t retval;
 764
 765         retval = ext2fs_mmp_clear(current_fs);
 766         if (retval != 0)
 767                 com_err("set_mmp_value", retval, "while clearing MMP block\n");
 768         else
 769                 memcpy(info->ptr, current_fs->mmp_buf, info->size);
 770
 771         return 1; /* we don't need the MMP block written again */
 772 }
 773
 774 void do_set_mmp_value(int argc, char *argv[])
 775 {
 776 #ifdef CONFIG_MMP
 777         const char *usage = "<field> <value>\n"
 778                 "\t\"set_mmp_value -l\" will list the names of "
 779                 "MMP fields\n\twhich can be set.";
 780         static struct field_set_info *smmp;
 781         struct mmp_struct *mmp_s;
 782         errcode_t retval;
 783
 784         if (argc == 2 && strcmp(argv[1], "-l") == 0) {
 785                 print_possible_fields(mmp_fields);
 786                 return;
 787         }
 788
 789         if (check_fs_open(argv[0]))
 790                 return;
 791
 792         if (current_fs->super->s_mmp_block == 0) {
 793                 com_err(argv[0], 0, "no MMP block allocated\n");
 794                 return;
 795         }
 796
 797         if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
 798                                 usage, CHECK_FS_RW))
 799                 return;
 800
 801         mmp_s = current_fs->mmp_buf;
 802         if (mmp_s == NULL) {
 803                 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
 804                 if (retval) {
 805                         com_err(argv[0], retval, "allocating MMP buffer\n");
 806                         return;
 807                 }
 808                 retval = ext2fs_mmp_read(current_fs,
 809                                          current_fs->super->s_mmp_block, mmp_s);
 810                 if (retval) {
 811                         com_err(argv[0], retval, "reading MMP block %llu.\n",
 812                                 (long long)current_fs->super->s_mmp_block);
 813                         ext2fs_free_mem(&mmp_s);
 814                         return;
 815                 }
 816                 current_fs->mmp_buf = mmp_s;
 817         }
 818
 819         smmp = find_field(mmp_fields, argv[1]);
 820         if (smmp == 0) {
 821                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 822                 return;
 823         }
 824
 825         set_mmp = *mmp_s;
 826         if (smmp->func(smmp, argv[1], argv[2]) == 0) {
 827                 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
 828                                  &set_mmp);
 829                 *mmp_s = set_mmp;
 830         }
 831 #else
 832         fprintf(stdout, "MMP is unsupported, please recompile with "
 833                         "--enable-mmp\n");
 834 #endif
 835 }
 836