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         { "error_count", &set_sb.s_error_count, NULL, 4, parse_uint },
 158         { "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time },
 159         { "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
 160         { "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint },
 161         { "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string },
 162         { "first_error_line", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
 163         { "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time },
 164         { "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
 165         { "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint },
 166         { "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string },
 167         { "last_error_line", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
 168         { 0, 0, 0, 0 }
 169 };
 170
 171 static struct field_set_info inode_fields[] = {
 172         { "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
 173         { "mode", &set_inode.i_mode, NULL, 2, parse_uint },
 174         { "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
 175                 2, parse_uint },
 176         { "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
 177         { "atime", &set_inode.i_atime, NULL, 4, parse_time },
 178         { "ctime", &set_inode.i_ctime, NULL, 4, parse_time },
 179         { "mtime", &set_inode.i_mtime, NULL, 4, parse_time },
 180         { "dtime", &set_inode.i_dtime, NULL, 4, parse_time },
 181         { "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
 182                 2, parse_uint },
 183         { "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
 184         /* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
 185         { "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
 186                 6, parse_uint },
 187         { "flags", &set_inode.i_flags, NULL, 4, parse_uint },
 188         { "version", &set_inode.osd1.linux1.l_i_version,
 189                 &set_inode.i_version_hi, 4, parse_uint },
 190         { "translator", &set_inode.osd1.hurd1.h_i_translator, NULL, 4, parse_uint },
 191         { "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
 192           EXT2_NDIR_BLOCKS },
 193         { "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
 194         { "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
 195         { "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
 196         { "generation", &set_inode.i_generation, NULL, 4, parse_uint },
 197         /* Special case: i_file_acl_high is 2 bytes */
 198         { "file_acl", &set_inode.i_file_acl,
 199                 &set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
 200         { "dir_acl", &set_inode.i_dir_acl, NULL, 4, parse_uint },
 201         { "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
 202         { "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint },
 203         { "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
 204         { "checksum", &set_inode.osd2.linux2.l_i_checksum_lo,
 205                 &set_inode.i_checksum_hi, 2, parse_uint },
 206         { "author", &set_inode.osd2.hurd2.h_i_author, NULL,
 207                 4, parse_uint },
 208         { "extra_isize", &set_inode.i_extra_isize, NULL,
 209                 2, parse_uint },
 210         { "ctime_extra", &set_inode.i_ctime_extra, NULL,
 211                 4, parse_uint },
 212         { "mtime_extra", &set_inode.i_mtime_extra, NULL,
 213                 4, parse_uint },
 214         { "atime_extra", &set_inode.i_atime_extra, NULL,
 215                 4, parse_uint },
 216         { "crtime", &set_inode.i_crtime, NULL, 4, parse_uint },
 217         { "crtime_extra", &set_inode.i_crtime_extra, NULL,
 218                 4, parse_uint },
 219         { "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
 220         { 0, 0, 0, 0 }
 221 };
 222
 223 static struct field_set_info ext2_bg_fields[] = {
 224         { "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
 225         { "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
 226         { "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
 227         { "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
 228         { "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
 229         { "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
 230         { "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
 231         { "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
 232         { "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
 233         { 0, 0, 0, 0 }
 234 };
 235
 236 static struct field_set_info ext4_bg_fields[] = {
 237         { "block_bitmap", &set_gd4.bg_block_bitmap,
 238                 &set_gd4.bg_block_bitmap_hi, 4, parse_uint },
 239         { "inode_bitmap", &set_gd4.bg_inode_bitmap,
 240                 &set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
 241         { "inode_table", &set_gd4.bg_inode_table,
 242                 &set_gd4.bg_inode_table_hi, 4, parse_uint },
 243         { "free_blocks_count", &set_gd4.bg_free_blocks_count,
 244                 &set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
 245         { "free_inodes_count", &set_gd4.bg_free_inodes_count,
 246                 &set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
 247         { "used_dirs_count", &set_gd4.bg_used_dirs_count,
 248                 &set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
 249         { "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
 250         { "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
 251                 &set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
 252         { "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
 253                 &set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
 254         { "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
 255                 &set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
 256         { "itable_unused", &set_gd4.bg_itable_unused,
 257                 &set_gd4.bg_itable_unused_hi, 2, parse_uint },
 258         { "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
 259         { 0, 0, 0, 0 }
 260 };
 261
 262 static struct field_set_info mmp_fields[] = {
 263         { "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp), parse_mmp_clear },
 264         { "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
 265         { "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
 266         { "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
 267         { "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
 268                 parse_string },
 269         { "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
 270                 parse_string },
 271         { "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
 272         { "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
 273 };
 274
 275 static int check_suffix(const char *field)
 276 {
 277         int len = strlen(field);
 278
 279         if (len <= 3)
 280                 return 0;
 281         field += len-3;
 282         if (!strcmp(field, "_lo"))
 283                 return 1;
 284         if (!strcmp(field, "_hi"))
 285                 return 2;
 286         return 0;
 287 }
 288
 289 static struct field_set_info *find_field(struct field_set_info *fields,
 290                                          char *field)
 291 {
 292         struct field_set_info *ss;
 293         const char      *prefix;
 294         char            *arg, *delim, *idx, *tmp;
 295         int             suffix, prefix_len;
 296
 297         if (fields == super_fields)
 298                 prefix = "s_";
 299         else if (fields == inode_fields)
 300                 prefix = "i_";
 301         else
 302                 prefix = "bg_";
 303         prefix_len = strlen(prefix);
 304         if (strncmp(field, prefix, prefix_len) == 0)
 305                 field += prefix_len;
 306
 307         arg = malloc(strlen(field)+1);
 308         if (!arg)
 309                 return NULL;
 310         strcpy(arg, field);
 311
 312         idx = strchr(arg, '[');
 313         if (idx) {
 314                 *idx++ = 0;
 315                 delim = idx + strlen(idx) - 1;
 316                 if (!*idx || *delim != ']')
 317                         idx = 0;
 318                 else
 319                         *delim = 0;
 320         }
 321         /*
 322          * Can we parse the number?
 323          */
 324         if (idx) {
 325                 array_idx = strtol(idx, &tmp, 0);
 326                 if (*tmp) {
 327                         *(--idx) = '[';
 328                         *delim = ']';
 329                         idx = 0;
 330                 }
 331         }
 332
 333         /*
 334          * If there is a valid _hi or a _lo suffix, strip it off
 335          */
 336         suffix = check_suffix(arg);
 337         if (suffix > 0)
 338                 arg[strlen(arg)-3] = 0;
 339
 340         for (ss = fields ; ss->name ; ss++) {
 341                 if (suffix && ss->ptr2 == 0)
 342                         continue;
 343                 if (ss->flags & FLAG_ARRAY) {
 344                         if (!idx || (strcmp(ss->name, arg) != 0))
 345                                 continue;
 346                         if (ss->max_idx > 0 && array_idx >= ss->max_idx)
 347                                 continue;
 348                 } else {
 349                         if (strcmp(ss->name, arg) != 0)
 350                                 continue;
 351                 }
 352                 free(arg);
 353                 return ss;
 354         }
 355         free(arg);
 356         return NULL;
 357 }
 358
 359 /*
 360  * Note: info->size == 6 is special; this means a base size 4 bytes,
 361  * and secondiory (high) size of 2 bytes.  This is needed for the
 362  * special case of i_blocks_high and i_file_acl_high.
 363  */
 364 static errcode_t parse_uint(struct field_set_info *info, char *field,
 365                             char *arg)
 366 {
 367         unsigned long long n, num, mask, limit;
 368         int suffix = check_suffix(field);
 369         char *tmp;
 370         void *field1 = info->ptr, *field2 = info->ptr2;
 371         int size = (info->size == 6) ? 4 : info->size;
 372         union {
 373                 __u64   *ptr64;
 374                 __u32   *ptr32;
 375                 __u16   *ptr16;
 376                 __u8    *ptr8;
 377         } u;
 378
 379         if (suffix == 1)
 380                 field2 = 0;
 381         if (suffix == 2) {
 382                 field1 = field2;
 383                 field2 = 0;
 384         }
 385
 386         u.ptr8 = (__u8 *) field1;
 387         if (info->flags & FLAG_ARRAY)
 388                 u.ptr8 += array_idx * info->size;
 389
 390         errno = 0;
 391         num = STRTOULL(arg, &tmp, 0);
 392         if (*tmp || errno) {
 393                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 394                         arg, info->name);
 395                 return EINVAL;
 396         }
 397         mask = ~0ULL >> ((8 - size) * 8);
 398         limit = ~0ULL >> ((8 - info->size) * 8);
 399         if (field2 && info->size != 6)
 400                 limit = ~0ULL >> ((8 - info->size*2) * 8);
 401
 402         if (num > limit) {
 403                 fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
 404                         arg, info->name, limit);
 405                 return EINVAL;
 406         }
 407         n = num & mask;
 408         switch (size) {
 409         case 8:
 410                 /* Should never get here */
 411                 fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
 412                         "defined; BUG?!?\n", info->name);
 413                 *u.ptr64 = 0;
 414                 break;
 415         case 4:
 416                 *u.ptr32 = n;
 417                 break;
 418         case 2:
 419                 *u.ptr16 = n;
 420                 break;
 421         case 1:
 422                 *u.ptr8 = n;
 423                 break;
 424         }
 425         if (!field2)
 426                 return 0;
 427         n = num >> (size*8);
 428         u.ptr8 = (__u8 *) field2;
 429         if (info->size == 6)
 430                 size = 2;
 431         switch (size) {
 432         case 8:
 433                 *u.ptr64 = n;
 434                 break;
 435         case 4:
 436                 *u.ptr32 = n;
 437                 break;
 438         case 2:
 439                 *u.ptr16 = n;
 440                 break;
 441         case 1:
 442                 *u.ptr8 = n;
 443                 break;
 444         }
 445         return 0;
 446 }
 447
 448 static errcode_t parse_int(struct field_set_info *info,
 449                            char *field EXT2FS_ATTR((unused)), char *arg)
 450 {
 451         long    num;
 452         char *tmp;
 453         __s32   *ptr32;
 454         __s16   *ptr16;
 455         __s8    *ptr8;
 456
 457         num = strtol(arg, &tmp, 0);
 458         if (*tmp) {
 459                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 460                         arg, info->name);
 461                 return EINVAL;
 462         }
 463         switch (info->size) {
 464         case 4:
 465                 ptr32 = (__s32 *) info->ptr;
 466                 *ptr32 = num;
 467                 break;
 468         case 2:
 469                 ptr16 = (__s16 *) info->ptr;
 470                 *ptr16 = num;
 471                 break;
 472         case 1:
 473                 ptr8 = (__s8 *) info->ptr;
 474                 *ptr8 = num;
 475                 break;
 476         }
 477         return 0;
 478 }
 479
 480 static errcode_t parse_string(struct field_set_info *info,
 481                               char *field EXT2FS_ATTR((unused)), char *arg)
 482 {
 483         char    *cp = (char *) info->ptr;
 484
 485         if (strlen(arg) >= info->size) {
 486                 fprintf(stderr, "Error maximum size for %s is %d.\n",
 487                         info->name, info->size);
 488                 return EINVAL;
 489         }
 490         strcpy(cp, arg);
 491         return 0;
 492 }
 493
 494 static errcode_t parse_time(struct field_set_info *info,
 495                             char *field EXT2FS_ATTR((unused)), char *arg)
 496 {
 497         time_t          t;
 498         __u32           *ptr32;
 499
 500         ptr32 = (__u32 *) info->ptr;
 501
 502         t = string_to_time(arg);
 503
 504         if (t == ((time_t) -1)) {
 505                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 506                         arg, info->name);
 507                 return EINVAL;
 508         }
 509         *ptr32 = t;
 510         return 0;
 511 }
 512
 513 static errcode_t parse_uuid(struct field_set_info *info,
 514                             char *field EXT2FS_ATTR((unused)), char *arg)
 515 {
 516         unsigned char * p = (unsigned char *) info->ptr;
 517
 518         if ((strcasecmp(arg, "null") == 0) ||
 519             (strcasecmp(arg, "clear") == 0)) {
 520                 uuid_clear(p);
 521         } else if (strcasecmp(arg, "time") == 0) {
 522                 uuid_generate_time(p);
 523         } else if (strcasecmp(arg, "random") == 0) {
 524                 uuid_generate(p);
 525         } else if (uuid_parse(arg, p)) {
 526                 fprintf(stderr, "Invalid UUID format: %s\n", arg);
 527                 return EINVAL;
 528         }
 529         return 0;
 530 }
 531
 532 static errcode_t parse_hashalg(struct field_set_info *info,
 533                                char *field EXT2FS_ATTR((unused)), char *arg)
 534 {
 535         int     hashv;
 536         unsigned char   *p = (unsigned char *) info->ptr;
 537
 538         hashv = e2p_string2hash(arg);
 539         if (hashv < 0) {
 540                 fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
 541                 return EINVAL;
 542         }
 543         *p = hashv;
 544         return 0;
 545 }
 546
 547 static errcode_t parse_bmap(struct field_set_info *info,
 548                             char *field EXT2FS_ATTR((unused)), char *arg)
 549 {
 550         blk64_t         blk;
 551         errcode_t       retval;
 552         char            *tmp;
 553
 554         blk = strtoull(arg, &tmp, 0);
 555         if (*tmp) {
 556                 fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 557                         arg, info->name);
 558                 return EINVAL;
 559         }
 560
 561         retval = ext2fs_bmap2(current_fs, set_ino,
 562                               (struct ext2_inode *) &set_inode,
 563                               NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL,
 564                               &blk);
 565         if (retval) {
 566                 com_err("set_inode", retval, "while setting block map");
 567         }
 568         return retval;
 569 }
 570
 571 static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
 572                                char *arg)
 573 {
 574
 575         if (strcmp(arg, "calc") == 0) {
 576                 ext2fs_group_desc_csum_set(current_fs, set_bg);
 577                 memcpy(&set_gd, ext2fs_group_desc(current_fs,
 578                                         current_fs->group_desc,
 579                                         set_bg),
 580                         sizeof(set_gd));
 581                 printf("Checksum set to 0x%04x\n",
 582                        ext2fs_bg_checksum(current_fs, set_bg));
 583                 return 0;
 584         }
 585
 586         return parse_uint(info, field, arg);
 587 }
 588
 589 static void print_possible_fields(struct field_set_info *fields)
 590 {
 591         struct field_set_info *ss;
 592         const char      *type, *cmd;
 593         FILE *f;
 594         char name[40], idx[40];
 595
 596         if (fields == super_fields) {
 597                 type = "Superblock";
 598                 cmd = "set_super_value";
 599         } else if (fields == inode_fields) {
 600                 type = "Inode";
 601                 cmd = "set_inode";
 602         } else if (fields == mmp_fields) {
 603                 type = "MMP";
 604                 cmd = "set_mmp_value";
 605         } else {
 606                 type = "Block group descriptor";
 607                 cmd = "set_block_group";
 608         }
 609         f = open_pager();
 610
 611         fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
 612
 613         for (ss = fields ; ss->name ; ss++) {
 614                 type = "unknown";
 615                 if (ss->func == parse_string)
 616                         type = "string";
 617                 else if (ss->func == parse_int)
 618                         type = "integer";
 619                 else if (ss->func == parse_uint)
 620                         type = "unsigned integer";
 621                 else if (ss->func == parse_uuid)
 622                         type = "UUID";
 623                 else if (ss->func == parse_hashalg)
 624                         type = "hash algorithm";
 625                 else if (ss->func == parse_time)
 626                         type = "date/time";
 627                 else if (ss->func == parse_bmap)
 628                         type = "set physical->logical block map";
 629                 else if (ss->func == parse_gd_csum)
 630                         type = "unsigned integer OR \"calc\"";
 631                 strcpy(name, ss->name);
 632                 if (ss->flags & FLAG_ARRAY) {
 633                         if (ss->max_idx > 0)
 634                                 sprintf(idx, "[%d]", ss->max_idx);
 635                         else
 636                                 strcpy(idx, "[]");
 637                         strcat(name, idx);
 638                 }
 639                 if (ss->ptr2)
 640                         strcat(name, "[_hi|_lo]");
 641                 fprintf(f, "\t%-25s\t%s\n", name, type);
 642         }
 643         close_pager(f);
 644 }
 645
 646
 647 void do_set_super(int argc, char *argv[])
 648 {
 649         const char *usage = "<field> <value>\n"
 650                 "\t\"set_super_value -l\" will list the names of "
 651                 "superblock fields\n\twhich can be set.";
 652         static struct field_set_info *ss;
 653
 654         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 655                 print_possible_fields(super_fields);
 656                 return;
 657         }
 658
 659         if (common_args_process(argc, argv, 3, 3, "set_super_value",
 660                                 usage, CHECK_FS_RW))
 661                 return;
 662
 663         if ((ss = find_field(super_fields, argv[1])) == 0) {
 664                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 665                 return;
 666         }
 667         set_sb = *current_fs->super;
 668         if (ss->func(ss, argv[1], argv[2]) == 0) {
 669                 *current_fs->super = set_sb;
 670                 ext2fs_mark_super_dirty(current_fs);
 671         }
 672 }
 673
 674 void do_set_inode(int argc, char *argv[])
 675 {
 676         const char *usage = "<inode> <field> <value>\n"
 677                 "\t\"set_inode_field -l\" will list the names of "
 678                 "the fields in an ext2 inode\n\twhich can be set.";
 679         static struct field_set_info *ss;
 680
 681         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 682                 print_possible_fields(inode_fields);
 683                 return;
 684         }
 685
 686         if (common_args_process(argc, argv, 4, 4, "set_inode",
 687                                 usage, CHECK_FS_RW))
 688                 return;
 689
 690         if ((ss = find_field(inode_fields, argv[2])) == 0) {
 691                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 692                 return;
 693         }
 694
 695         set_ino = string_to_inode(argv[1]);
 696         if (!set_ino)
 697                 return;
 698
 699         if (debugfs_read_inode_full(set_ino,
 700                         (struct ext2_inode *) &set_inode, argv[1],
 701                                     sizeof(set_inode)))
 702                 return;
 703
 704         if (ss->func(ss, argv[2], argv[3]) == 0) {
 705                 if (debugfs_write_inode_full(set_ino,
 706                              (struct ext2_inode *) &set_inode,
 707                              argv[1], sizeof(set_inode)))
 708                         return;
 709         }
 710 }
 711
 712 void do_set_block_group_descriptor(int argc, char *argv[])
 713 {
 714         const char *usage = "<bg number> <field> <value>\n"
 715                 "\t\"set_block_group_descriptor -l\" will list the names of "
 716                 "the fields in a block group descriptor\n\twhich can be set.";
 717         struct field_set_info   *table;
 718         struct field_set_info   *ss;
 719         char                    *end;
 720         void                    *edit, *target;
 721         int                     size;
 722
 723         /*
 724          * Determine whether we are editing an ext2 or ext4 block group
 725          * descriptor.  Descriptors larger than ext4_group_desc cannot
 726          * have their fields edited yet, because they do not have any
 727          * names assigned.  When that happens, this function needs to
 728          * be updated for the new descriptor struct and fields.
 729          */
 730         if (current_fs &&
 731             EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) {
 732                 table = ext4_bg_fields;
 733                 edit = &set_gd4;
 734                 size = sizeof(set_gd4);
 735         } else {
 736                 table = ext2_bg_fields;
 737                 edit = &set_gd;
 738                 size = sizeof(set_gd);
 739         }
 740
 741         if ((argc == 2) && !strcmp(argv[1], "-l")) {
 742                 print_possible_fields(table);
 743                 return;
 744         }
 745
 746         if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
 747                                 usage, CHECK_FS_RW))
 748                 return;
 749
 750         set_bg = strtoul(argv[1], &end, 0);
 751         if (*end) {
 752                 com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
 753                 return;
 754         }
 755
 756         if (set_bg >= current_fs->group_desc_count) {
 757                 com_err(argv[0], 0, "block group number too big: %d", set_bg);
 758                 return;
 759         }
 760
 761         if ((ss = find_field(table, argv[2])) == 0) {
 762                 com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
 763                 return;
 764         }
 765
 766         target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
 767         memcpy(edit, target, size);
 768         if (ss->func(ss, argv[2], argv[3]) == 0) {
 769                 memcpy(target, edit, size);
 770                 ext2fs_mark_super_dirty(current_fs);
 771         }
 772 }
 773
 774 static errcode_t parse_mmp_clear(struct field_set_info *info,
 775                                  char *field EXT2FS_ATTR((unused)),
 776                                  char *arg EXT2FS_ATTR((unused)))
 777 {
 778         errcode_t retval;
 779
 780         retval = ext2fs_mmp_clear(current_fs);
 781         if (retval != 0)
 782                 com_err("set_mmp_value", retval, "while clearing MMP block\n");
 783         else
 784                 memcpy(info->ptr, current_fs->mmp_buf, info->size);
 785
 786         return 1; /* we don't need the MMP block written again */
 787 }
 788
 789 void do_set_mmp_value(int argc, char *argv[])
 790 {
 791 #ifdef CONFIG_MMP
 792         const char *usage = "<field> <value>\n"
 793                 "\t\"set_mmp_value -l\" will list the names of "
 794                 "MMP fields\n\twhich can be set.";
 795         static struct field_set_info *smmp;
 796         struct mmp_struct *mmp_s;
 797         errcode_t retval;
 798
 799         if (argc == 2 && strcmp(argv[1], "-l") == 0) {
 800                 print_possible_fields(mmp_fields);
 801                 return;
 802         }
 803
 804         if (check_fs_open(argv[0]))
 805                 return;
 806
 807         if (current_fs->super->s_mmp_block == 0) {
 808                 com_err(argv[0], 0, "no MMP block allocated\n");
 809                 return;
 810         }
 811
 812         if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
 813                                 usage, CHECK_FS_RW))
 814                 return;
 815
 816         mmp_s = current_fs->mmp_buf;
 817         if (mmp_s == NULL) {
 818                 retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
 819                 if (retval) {
 820                         com_err(argv[0], retval, "allocating MMP buffer\n");
 821                         return;
 822                 }
 823                 retval = ext2fs_mmp_read(current_fs,
 824                                          current_fs->super->s_mmp_block, mmp_s);
 825                 if (retval) {
 826                         com_err(argv[0], retval, "reading MMP block %llu.\n",
 827                                 (long long)current_fs->super->s_mmp_block);
 828                         ext2fs_free_mem(&mmp_s);
 829                         return;
 830                 }
 831                 current_fs->mmp_buf = mmp_s;
 832         }
 833
 834         smmp = find_field(mmp_fields, argv[1]);
 835         if (smmp == 0) {
 836                 com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
 837                 return;
 838         }
 839
 840         set_mmp = *mmp_s;
 841         if (smmp->func(smmp, argv[1], argv[2]) == 0) {
 842                 ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
 843                                  &set_mmp);
 844                 *mmp_s = set_mmp;
 845         }
 846 #else
 847         fprintf(stdout, "MMP is unsupported, please recompile with "
 848                         "--enable-mmp\n");
 849 #endif
 850 }
 851