X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=debugfs%2Fset_fields.c;h=f497bd929716eb6f364396c10c392d782bbc6f04;hb=8fd92e9af006da392d667775b8bbe0db9e8639d2;hp=da699a7d3558fb70eb35b0ca034d1c3d07c2aa89;hpb=1d3a95111820e3e8e79b2ae18ed04f050cd3f0cb;p=tools%2Fe2fsprogs.git

diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
index da699a7..f497bd9 100644
--- a/debugfs/set_fields.c
+++ b/debugfs/set_fields.c
@@ -1,159 +1,388 @@
 /*
  * set_fields.c --- set a superblock value
- * 
+ *
  * Copyright (C) 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o.
- * 
+ *
  * %Begin-Header%
  * This file may be redistributed under the terms of the GNU Public
  * License.
  * %End-Header%
  */
 
+#define _XOPEN_SOURCE 600 /* for inclusion of strptime() and strtoull */
+
+#ifdef HAVE_STRTOULL
+#define STRTOULL strtoull
+#else
+#define STRTOULL strtoul
+#endif
+
+#include "config.h"
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include <string.h>
+#include <strings.h>
 #include <time.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
+#include <assert.h>
+#if HAVE_STRINGS_H
+#include <strings.h>
+#endif
 #include <fcntl.h>
 #include <utime.h>
 
 #include "debugfs.h"
 #include "uuid/uuid.h"
 #include "e2p/e2p.h"
+#include "support/quotaio.h"
 
 static struct ext2_super_block set_sb;
-static struct ext2_inode set_inode;
+static struct ext2_inode_large set_inode;
+static struct ext2_group_desc set_gd;
+static struct ext4_group_desc set_gd4;
+static struct mmp_struct set_mmp;
+static dgrp_t set_bg;
 static ext2_ino_t set_ino;
 static int array_idx;
 
 #define FLAG_ARRAY	0x0001
+#define FLAG_ALIAS	0x0002	/* Data intersects with other field */
+#define FLAG_CSUM	0x0004
 
 struct field_set_info {
 	const char	*name;
 	void	*ptr;
+	void	*ptr2;
 	unsigned int	size;
-	errcode_t (*func)(struct field_set_info *info, char *arg);
+	errcode_t (*func)(struct field_set_info *info, char *field, char *arg);
 	int flags;
 	int max_idx;
 };
 
-static errcode_t parse_uint(struct field_set_info *info, char *arg);
-static errcode_t parse_int(struct field_set_info *info, char *arg);
-static errcode_t parse_string(struct field_set_info *info, char *arg);
-static errcode_t parse_uuid(struct field_set_info *info, char *arg);
-static errcode_t parse_hashalg(struct field_set_info *info, char *arg);
-static errcode_t parse_time(struct field_set_info *info, char *arg);
-static errcode_t parse_bmap(struct field_set_info *info, char *arg);
+static errcode_t parse_uint(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_int(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_string(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_uuid(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_hashalg(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_encoding(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_time(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_bmap(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_gd_csum(struct field_set_info *info, char *field, char *arg);
+static errcode_t parse_inode_csum(struct field_set_info *info, char *field,
+				  char *arg);
+static errcode_t parse_mmp_clear(struct field_set_info *info, char *field,
+				 char *arg);
+
+#if __GNUC_PREREQ (4, 6) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+#endif
 
 static struct field_set_info super_fields[] = {
-	{ "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
-	{ "blocks_count", &set_sb.s_blocks_count, 4, parse_uint },
-	{ "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint },
-	{ "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint },
-	{ "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint },
-	{ "first_data_block", &set_sb.s_first_data_block, 4, parse_uint },
-	{ "log_block_size", &set_sb.s_log_block_size, 4, parse_uint },
-	{ "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int },
-	{ "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint },
-	{ "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint },
-	{ "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint },
-	{ "mtime", &set_sb.s_mtime, 4, parse_time },
-	{ "wtime", &set_sb.s_wtime, 4, parse_time },
-	{ "mnt_count", &set_sb.s_mnt_count, 2, parse_uint },
-	{ "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int },
+	{ "inodes_count", &set_sb.s_inodes_count, NULL, 4, parse_uint },
+	{ "blocks_count", &set_sb.s_blocks_count, &set_sb.s_blocks_count_hi,
+		4, parse_uint },
+	{ "r_blocks_count", &set_sb.s_r_blocks_count,
+		&set_sb.s_r_blocks_count_hi, 4, parse_uint },
+	{ "free_blocks_count", &set_sb.s_free_blocks_count,
+		&set_sb.s_free_blocks_hi, 4, parse_uint },
+	{ "free_inodes_count", &set_sb.s_free_inodes_count, NULL, 4, parse_uint },
+	{ "first_data_block", &set_sb.s_first_data_block, NULL, 4, parse_uint },
+	{ "log_block_size", &set_sb.s_log_block_size, NULL, 4, parse_uint },
+	{ "log_cluster_size", &set_sb.s_log_cluster_size, NULL, 4, parse_int },
+	{ "blocks_per_group", &set_sb.s_blocks_per_group, NULL, 4, parse_uint },
+	{ "clusters_per_group", &set_sb.s_clusters_per_group, NULL, 4, parse_uint },
+	{ "inodes_per_group", &set_sb.s_inodes_per_group, NULL, 4, parse_uint },
+	{ "mtime", &set_sb.s_mtime, NULL, 4, parse_time },
+	{ "wtime", &set_sb.s_wtime, NULL, 4, parse_time },
+	{ "mnt_count", &set_sb.s_mnt_count, NULL, 2, parse_uint },
+	{ "max_mnt_count", &set_sb.s_max_mnt_count, NULL, 2, parse_int },
 	/* s_magic */
-	{ "state", &set_sb.s_state, 2, parse_uint },
-	{ "errors", &set_sb.s_errors, 2, parse_uint },
-	{ "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint },
-	{ "lastcheck", &set_sb.s_lastcheck, 4, parse_time },
-	{ "checkinterval", &set_sb.s_checkinterval, 4, parse_uint },
-	{ "creator_os", &set_sb.s_creator_os, 4, parse_uint },
-	{ "rev_level", &set_sb.s_rev_level, 4, parse_uint },
-	{ "def_resuid", &set_sb.s_def_resuid, 2, parse_uint },
-	{ "def_resgid", &set_sb.s_def_resgid, 2, parse_uint },
-	{ "first_ino", &set_sb.s_first_ino, 4, parse_uint },
-	{ "inode_size", &set_sb.s_inode_size, 2, parse_uint },
-	{ "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint },
-	{ "feature_compat", &set_sb.s_feature_compat, 4, parse_uint },
-	{ "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint },
-	{ "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint }, 
-	{ "uuid", &set_sb.s_uuid, 16, parse_uuid },
-	{ "volume_name",  &set_sb.s_volume_name, 16, parse_string },
-	{ "last_mounted",  &set_sb.s_last_mounted, 64, parse_string },
-	{ "lastcheck",  &set_sb.s_lastcheck, 4, parse_uint },
-	{ "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, 
+	{ "state", &set_sb.s_state, NULL, 2, parse_uint },
+	{ "errors", &set_sb.s_errors, NULL, 2, parse_uint },
+	{ "minor_rev_level", &set_sb.s_minor_rev_level, NULL, 2, parse_uint },
+	{ "lastcheck", &set_sb.s_lastcheck, NULL, 4, parse_time },
+	{ "checkinterval", &set_sb.s_checkinterval, NULL, 4, parse_uint },
+	{ "creator_os", &set_sb.s_creator_os, NULL, 4, parse_uint },
+	{ "rev_level", &set_sb.s_rev_level, NULL, 4, parse_uint },
+	{ "def_resuid", &set_sb.s_def_resuid, NULL, 2, parse_uint },
+	{ "def_resgid", &set_sb.s_def_resgid, NULL, 2, parse_uint },
+	{ "first_ino", &set_sb.s_first_ino, NULL, 4, parse_uint },
+	{ "inode_size", &set_sb.s_inode_size, NULL, 2, parse_uint },
+	{ "block_group_nr", &set_sb.s_block_group_nr, NULL, 2, parse_uint },
+	{ "feature_compat", &set_sb.s_feature_compat, NULL, 4, parse_uint },
+	{ "feature_incompat", &set_sb.s_feature_incompat, NULL, 4, parse_uint },
+	{ "feature_ro_compat", &set_sb.s_feature_ro_compat, NULL, 4, parse_uint },
+	{ "uuid", &set_sb.s_uuid, NULL, 16, parse_uuid },
+	{ "volume_name",  &set_sb.s_volume_name, NULL, 16, parse_string },
+	{ "last_mounted",  &set_sb.s_last_mounted, NULL, 64, parse_string },
+	{ "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap, NULL,
 		  4, parse_uint },
-	{ "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
-	{ "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
+	{ "prealloc_blocks", &set_sb.s_prealloc_blocks, NULL, 1, parse_uint },
+	{ "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, NULL, 1,
 		  parse_uint },
-	{ "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2,
+	{ "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, NULL, 2,
 		  parse_uint },
-	/* s_padding1 */
-	{ "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid },
-	{ "journal_inum", &set_sb.s_journal_inum, 4, parse_uint },
-	{ "journal_dev", &set_sb.s_journal_dev, 4, parse_uint },
-	{ "last_orphan", &set_sb.s_last_orphan, 4, parse_uint },
-	{ "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid },
-	{ "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg },
-	{ "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint },
-	/* s_reserved_word_pad */
-	{ "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint },
-	{ "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint },
-	{ "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time },
+	{ "journal_uuid", &set_sb.s_journal_uuid, NULL, 16, parse_uuid },
+	{ "journal_inum", &set_sb.s_journal_inum, NULL, 4, parse_uint },
+	{ "journal_dev", &set_sb.s_journal_dev, NULL, 4, parse_uint },
+	{ "last_orphan", &set_sb.s_last_orphan, NULL, 4, parse_uint },
+	{ "hash_seed", &set_sb.s_hash_seed, NULL, 16, parse_uuid },
+	{ "def_hash_version", &set_sb.s_def_hash_version, NULL, 1, parse_hashalg },
+	{ "jnl_backup_type", &set_sb.s_jnl_backup_type, NULL, 1, parse_uint },
+	{ "desc_size", &set_sb.s_desc_size, NULL, 2, parse_uint },
+	{ "default_mount_opts", &set_sb.s_default_mount_opts, NULL, 4, parse_uint },
+	{ "first_meta_bg", &set_sb.s_first_meta_bg, NULL, 4, parse_uint },
+	{ "mkfs_time", &set_sb.s_mkfs_time, NULL, 4, parse_time },
+	{ "jnl_blocks", &set_sb.s_jnl_blocks[0], NULL, 4, parse_uint, FLAG_ARRAY,
+	  17 },
+	{ "min_extra_isize", &set_sb.s_min_extra_isize, NULL, 2, parse_uint },
+	{ "want_extra_isize", &set_sb.s_want_extra_isize, NULL, 2, parse_uint },
+	{ "flags", &set_sb.s_flags, NULL, 4, parse_uint },
+	{ "raid_stride", &set_sb.s_raid_stride, NULL, 2, parse_uint },
+	{ "mmp_interval", &set_sb.s_mmp_update_interval, NULL, 2, parse_uint },
+	{ "mmp_block", &set_sb.s_mmp_block, NULL, 8, parse_uint },
+	{ "raid_stripe_width", &set_sb.s_raid_stripe_width, NULL, 4, parse_uint },
+	{ "log_groups_per_flex", &set_sb.s_log_groups_per_flex, NULL, 1, parse_uint },
+	{ "kbytes_written", &set_sb.s_kbytes_written, NULL, 8, parse_uint },
+	{ "snapshot_inum", &set_sb.s_snapshot_inum, NULL, 4, parse_uint },
+	{ "snapshot_id", &set_sb.s_snapshot_id, NULL, 4, parse_uint },
+	{ "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count,
+	  NULL, 8, parse_uint },
+	{ "snapshot_list", &set_sb.s_snapshot_list, NULL, 4, parse_uint },
+	{ "mount_opts",  &set_sb.s_mount_opts, NULL, 64, parse_string },
+	{ "usr_quota_inum", &set_sb.s_usr_quota_inum, NULL, 4, parse_uint },
+	{ "grp_quota_inum", &set_sb.s_grp_quota_inum, NULL, 4, parse_uint },
+	{ "prj_quota_inum", &set_sb.s_prj_quota_inum, NULL, 4, parse_uint },
+	{ "overhead_clusters", &set_sb.s_overhead_clusters, NULL, 4, parse_uint },
+	{ "backup_bgs", &set_sb.s_backup_bgs[0], NULL, 4, parse_uint,
+	  FLAG_ARRAY, 2 },
+	{ "checksum", &set_sb.s_checksum, NULL, 4, parse_uint },
+	{ "checksum_type", &set_sb.s_checksum_type, NULL, 1, parse_uint },
+	{ "encryption_level", &set_sb.s_encryption_level, NULL, 1, parse_uint },
+	{ "error_count", &set_sb.s_error_count, NULL, 4, parse_uint },
+	{ "first_error_time", &set_sb.s_first_error_time, NULL, 4, parse_time },
+	{ "first_error_ino", &set_sb.s_first_error_ino, NULL, 4, parse_uint },
+	{ "first_error_block", &set_sb.s_first_error_block, NULL, 8, parse_uint },
+	{ "first_error_func", &set_sb.s_first_error_func, NULL, 32, parse_string },
+	{ "first_error_line", &set_sb.s_first_error_line, NULL, 4, parse_uint },
+	{ "last_error_time", &set_sb.s_last_error_time, NULL, 4, parse_time },
+	{ "last_error_ino", &set_sb.s_last_error_ino, NULL, 4, parse_uint },
+	{ "last_error_block", &set_sb.s_last_error_block, NULL, 8, parse_uint },
+	{ "last_error_func", &set_sb.s_last_error_func, NULL, 32, parse_string },
+	{ "last_error_line", &set_sb.s_last_error_line, NULL, 4, parse_uint },
+	{ "encrypt_algos", &set_sb.s_encrypt_algos, NULL, 1, parse_uint,
+	  FLAG_ARRAY, 4 },
+	{ "encrypt_pw_salt", &set_sb.s_encrypt_pw_salt, NULL, 16, parse_uuid },
+	{ "lpf_ino", &set_sb.s_lpf_ino, NULL, 4, parse_uint },
+	{ "checksum_seed", &set_sb.s_checksum_seed, NULL, 4, parse_uint },
+	{ "encoding", &set_sb.s_encoding, NULL, 2, parse_encoding },
 	{ 0, 0, 0, 0 }
 };
 
 static struct field_set_info inode_fields[] = {
-	{ "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
-	{ "mode", &set_inode.i_mode, 2, parse_uint },
-	{ "uid", &set_inode.i_uid, 2, parse_uint },
-	{ "size", &set_inode.i_uid, 4, parse_uint },
-	{ "atime", &set_inode.i_atime, 4, parse_time },
-	{ "ctime", &set_inode.i_ctime, 4, parse_time },
-	{ "mtime", &set_inode.i_mtime, 4, parse_time },
-	{ "dtime", &set_inode.i_dtime, 4, parse_time },
-	{ "gid", &set_inode.i_gid, 2, parse_uint },
-	{ "links_count", &set_inode.i_links_count, 2, parse_uint },
-	{ "blocks", &set_inode.i_blocks, 4, parse_uint },
-	{ "flags", &set_inode.i_flags, 4, parse_uint },
-	{ "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
-	{ "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY, 
+	{ "mode", &set_inode.i_mode, NULL, 2, parse_uint },
+	{ "uid", &set_inode.i_uid, &set_inode.osd2.linux2.l_i_uid_high,
+		2, parse_uint },
+	{ "size", &set_inode.i_size, &set_inode.i_size_high, 4, parse_uint },
+	{ "atime", &set_inode.i_atime, &set_inode.i_atime_extra,
+		4, parse_time },
+	{ "ctime", &set_inode.i_ctime, &set_inode.i_ctime_extra,
+		4, parse_time },
+	{ "mtime", &set_inode.i_mtime, &set_inode.i_mtime_extra,
+		4, parse_time },
+	{ "dtime", &set_inode.i_dtime, NULL,
+		4, parse_time },
+	{ "gid", &set_inode.i_gid, &set_inode.osd2.linux2.l_i_gid_high,
+		2, parse_uint },
+	{ "links_count", &set_inode.i_links_count, NULL, 2, parse_uint },
+	/* Special case: i_blocks is 4 bytes, i_blocks_high is 2 bytes */
+	{ "blocks", &set_inode.i_blocks, &set_inode.osd2.linux2.l_i_blocks_hi,
+		6, parse_uint },
+	{ "flags", &set_inode.i_flags, NULL, 4, parse_uint },
+	{ "version", &set_inode.osd1.linux1.l_i_version,
+		&set_inode.i_version_hi, 4, parse_uint },
+	{ "translator", &set_inode.osd1.hurd1.h_i_translator, NULL,
+		4, parse_uint, FLAG_ALIAS },
+	{ "block", &set_inode.i_block[0], NULL, 4, parse_uint, FLAG_ARRAY,
 	  EXT2_NDIR_BLOCKS },
-	{ "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
-	{ "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
-	{ "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
-	{ "generation", &set_inode.i_generation, 4, parse_uint },
-	{ "file_acl", &set_inode.i_file_acl, 4, parse_uint },
-	{ "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
-	{ "faddr", &set_inode.i_faddr, 4, parse_uint },
-	{ "frag", &set_inode.osd2.linux2.l_i_frag, 8, parse_uint },
-	{ "fsize", &set_inode.osd2.linux2.l_i_fsize, 8, parse_uint },
-	{ "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 8, parse_uint },
-	{ "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 8, parse_uint },
-	{ "author", &set_inode.osd2.hurd2.h_i_author, 8, parse_uint },
-	{ "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
+	{ "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], NULL, 4, parse_uint },
+	{ "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], NULL, 4, parse_uint },
+	{ "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], NULL, 4, parse_uint },
+	{ "generation", &set_inode.i_generation, NULL, 4, parse_uint },
+	/* Special case: i_file_acl_high is 2 bytes */
+	{ "file_acl", &set_inode.i_file_acl, 
+		&set_inode.osd2.linux2.l_i_file_acl_high, 6, parse_uint },
+	{ "faddr", &set_inode.i_faddr, NULL, 4, parse_uint },
+	{ "frag", &set_inode.osd2.hurd2.h_i_frag, NULL, 1, parse_uint, FLAG_ALIAS },
+	{ "fsize", &set_inode.osd2.hurd2.h_i_fsize, NULL, 1, parse_uint },
+	{ "checksum", &set_inode.osd2.linux2.l_i_checksum_lo, 
+		&set_inode.i_checksum_hi, 2, parse_inode_csum, FLAG_CSUM },
+	{ "author", &set_inode.osd2.hurd2.h_i_author, NULL,
+		4, parse_uint, FLAG_ALIAS },
+	{ "extra_isize", &set_inode.i_extra_isize, NULL,
+		2, parse_uint },
+	{ "ctime_extra", &set_inode.i_ctime_extra, NULL,
+		4, parse_uint, FLAG_ALIAS },
+	{ "mtime_extra", &set_inode.i_mtime_extra, NULL,
+		4, parse_uint, FLAG_ALIAS  },
+	{ "atime_extra", &set_inode.i_atime_extra, NULL,
+		4, parse_uint, FLAG_ALIAS },
+	{ "crtime", &set_inode.i_crtime, &set_inode.i_crtime_extra,
+		4, parse_time },
+	{ "crtime_extra", &set_inode.i_crtime_extra, NULL,
+		4, parse_uint, FLAG_ALIAS },
+	{ "projid", &set_inode.i_projid, NULL, 4, parse_uint },
+	{ "bmap", NULL, NULL, 4, parse_bmap, FLAG_ARRAY },
 	{ 0, 0, 0, 0 }
 };
 
+static struct field_set_info ext2_bg_fields[] = {
+	{ "block_bitmap", &set_gd.bg_block_bitmap, NULL, 4, parse_uint },
+	{ "inode_bitmap", &set_gd.bg_inode_bitmap, NULL, 4, parse_uint },
+	{ "inode_table", &set_gd.bg_inode_table, NULL, 4, parse_uint },
+	{ "free_blocks_count", &set_gd.bg_free_blocks_count, NULL, 2, parse_uint },
+	{ "free_inodes_count", &set_gd.bg_free_inodes_count, NULL, 2, parse_uint },
+	{ "used_dirs_count", &set_gd.bg_used_dirs_count, NULL, 2, parse_uint },
+	{ "flags", &set_gd.bg_flags, NULL, 2, parse_uint },
+	{ "itable_unused", &set_gd.bg_itable_unused, NULL, 2, parse_uint },
+	{ "checksum", &set_gd.bg_checksum, NULL, 2, parse_gd_csum },
+	{ 0, 0, 0, 0 }
+};
+
+static struct field_set_info ext4_bg_fields[] = {
+	{ "block_bitmap", &set_gd4.bg_block_bitmap,
+		&set_gd4.bg_block_bitmap_hi, 4, parse_uint },
+	{ "inode_bitmap", &set_gd4.bg_inode_bitmap,
+		&set_gd4.bg_inode_bitmap_hi, 4, parse_uint },
+	{ "inode_table", &set_gd4.bg_inode_table,
+		&set_gd4.bg_inode_table_hi, 4, parse_uint },
+	{ "free_blocks_count", &set_gd4.bg_free_blocks_count,
+		&set_gd4.bg_free_blocks_count_hi, 2, parse_uint },
+	{ "free_inodes_count", &set_gd4.bg_free_inodes_count,
+		&set_gd4.bg_free_inodes_count_hi, 2, parse_uint },
+	{ "used_dirs_count", &set_gd4.bg_used_dirs_count,
+		&set_gd4.bg_used_dirs_count_hi, 2, parse_uint },
+	{ "flags", &set_gd4.bg_flags, NULL, 2, parse_uint },
+	{ "exclude_bitmap", &set_gd4.bg_exclude_bitmap_lo,
+		&set_gd4.bg_exclude_bitmap_hi, 4, parse_uint },
+	{ "block_bitmap_csum", &set_gd4.bg_block_bitmap_csum_lo,
+		&set_gd4.bg_block_bitmap_csum_hi, 2, parse_uint },
+	{ "inode_bitmap_csum", &set_gd4.bg_inode_bitmap_csum_lo,
+		&set_gd4.bg_inode_bitmap_csum_hi, 2, parse_uint },
+	{ "itable_unused", &set_gd4.bg_itable_unused,
+		&set_gd4.bg_itable_unused_hi, 2, parse_uint },
+	{ "checksum", &set_gd4.bg_checksum, NULL, 2, parse_gd_csum },
+	{ 0, 0, 0, 0 }
+};
+
+static struct field_set_info mmp_fields[] = {
+	{ "clear", &set_mmp.mmp_magic, NULL, sizeof(set_mmp),
+		parse_mmp_clear, FLAG_ALIAS },
+	{ "magic", &set_mmp.mmp_magic, NULL, 4, parse_uint },
+	{ "seq", &set_mmp.mmp_seq, NULL, 4, parse_uint },
+	{ "time", &set_mmp.mmp_time, NULL, 8, parse_uint },
+	{ "nodename", &set_mmp.mmp_nodename, NULL, sizeof(set_mmp.mmp_nodename),
+		parse_string },
+	{ "bdevname", &set_mmp.mmp_bdevname, NULL, sizeof(set_mmp.mmp_bdevname),
+		parse_string },
+	{ "check_interval", &set_mmp.mmp_check_interval, NULL, 2, parse_uint },
+	{ "checksum", &set_mmp.mmp_checksum, NULL, 4, parse_uint },
+	{ 0, 0, 0, 0 }
+};
+#if __GNUC_PREREQ (4, 6)
+#pragma GCC diagnostic pop
+#endif
+
+#ifdef UNITTEST
+
+
+static void do_verify_field_set_info(struct field_set_info *fields,
+		const void *data, size_t size)
+{
+	struct field_set_info *ss, *ss2;
+	const char *begin = (char *)data;
+	const char *end = begin + size;
+
+	for (ss = fields ; ss->name ; ss++) {
+		const char *ptr;
+
+		/* Check pointers */
+		ptr = ss->ptr;
+		assert(!ptr || (ptr >= begin && ptr < end));
+		ptr = ss->ptr2;
+		assert(!ptr || (ptr >= begin && ptr < end));
+
+		/* Check function */
+		assert(ss->func);
+
+		for (ss2 = fields ; ss2 != ss ; ss2++) {
+			/* Check duplicate names */
+			assert(strcmp(ss->name, ss2->name));
+
+			if (ss->flags & FLAG_ALIAS || ss2->flags & FLAG_ALIAS)
+				continue;
+			/* Check false aliases, might be copy-n-paste error */
+			assert(!ss->ptr || (ss->ptr != ss2->ptr &&
+					    ss->ptr != ss2->ptr2));
+			assert(!ss->ptr2 || (ss->ptr2 != ss2->ptr &&
+					     ss->ptr2 != ss2->ptr2));
+		}
+	}
+}
+
+int main(int argc, char **argv)
+{
+	do_verify_field_set_info(super_fields, &set_sb, sizeof(set_sb));
+	do_verify_field_set_info(inode_fields, &set_inode, sizeof(set_inode));
+	do_verify_field_set_info(ext2_bg_fields, &set_gd, sizeof(set_gd));
+	do_verify_field_set_info(ext4_bg_fields, &set_gd4, sizeof(set_gd4));
+	do_verify_field_set_info(mmp_fields, &set_mmp, sizeof(set_mmp));
+	return 0;
+}
+
+ext2_filsys current_fs;
+ext2_ino_t root, cwd;
+
+#endif /* UNITTEST */
+
+static int check_suffix(const char *field)
+{
+	int len = strlen(field);
+
+	if (len <= 3)
+		return 0;
+	field += len-3;
+	if (!strcmp(field, "_lo"))
+		return 1;
+	if (!strcmp(field, "_hi"))
+		return 2;
+	return 0;
+}
+
 static struct field_set_info *find_field(struct field_set_info *fields,
 					 char *field)
 {
 	struct field_set_info *ss;
 	const char	*prefix;
 	char		*arg, *delim, *idx, *tmp;
+	int		suffix, prefix_len;
 
 	if (fields == super_fields)
 		prefix = "s_";
-	else
+	else if (fields == inode_fields)
 		prefix = "i_";
-	if (strncmp(field, prefix, 2) == 0)
-		field += 2;
+	else
+		prefix = "bg_";
+	prefix_len = strlen(prefix);
+	if (strncmp(field, prefix, prefix_len) == 0)
+		field += prefix_len;
 
 	arg = malloc(strlen(field)+1);
 	if (!arg)
@@ -169,66 +398,135 @@ static struct field_set_info *find_field(struct field_set_info *fields,
 		else
 			*delim = 0;
 	}
-	/* 
+	/*
 	 * Can we parse the number?
 	 */
 	if (idx) {
 		array_idx = strtol(idx, &tmp, 0);
-		if (*tmp)
+		if (*tmp) {
+			*(--idx) = '[';
+			*delim = ']';
 			idx = 0;
+		}
 	}
 
+	/*
+	 * If there is a valid _hi or a _lo suffix, strip it off
+	 */
+	suffix = check_suffix(arg);
+	if (suffix > 0)
+		arg[strlen(arg)-3] = 0;
+
 	for (ss = fields ; ss->name ; ss++) {
+		if (suffix && ss->ptr2 == 0)
+			continue;
 		if (ss->flags & FLAG_ARRAY) {
 			if (!idx || (strcmp(ss->name, arg) != 0))
 				continue;
 			if (ss->max_idx > 0 && array_idx >= ss->max_idx)
 				continue;
 		} else {
-			if (strcmp(ss->name, field) != 0)
+			if (strcmp(ss->name, arg) != 0)
 				continue;
 		}
+		free(arg);
 		return ss;
 	}
-
+	free(arg);
 	return NULL;
 }
 
-static errcode_t parse_uint(struct field_set_info *info, char *arg)
+/*
+ * Note: info->size == 6 is special; this means a base size 4 bytes,
+ * and secondary (high) size of 2 bytes.  This is needed for the
+ * special case of i_blocks_high and i_file_acl_high.
+ */
+static errcode_t parse_uint(struct field_set_info *info, char *field,
+			    char *arg)
 {
-	unsigned long	num;
+	unsigned long long n, num, mask, limit;
+	int suffix = check_suffix(field);
 	char *tmp;
+	void *field1 = info->ptr, *field2 = info->ptr2;
+	int size = (info->size == 6) ? 4 : info->size;
 	union {
+		__u64	*ptr64;
 		__u32	*ptr32;
 		__u16	*ptr16;
 		__u8	*ptr8;
 	} u;
 
-	u.ptr8 = (__u8 *) info->ptr;
+	if (suffix == 1)
+		field2 = 0;
+	if (suffix == 2) {
+		field1 = field2;
+		field2 = 0;
+	}
+
+	u.ptr8 = (__u8 *) field1;
 	if (info->flags & FLAG_ARRAY)
 		u.ptr8 += array_idx * info->size;
 
-	num = strtoul(arg, &tmp, 0);
-	if (*tmp) {
+	errno = 0;
+	num = STRTOULL(arg, &tmp, 0);
+	if (*tmp || errno) {
 		fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 			arg, info->name);
 		return EINVAL;
 	}
-	switch (info->size) {
+	mask = ~0ULL >> ((8 - size) * 8);
+	limit = ~0ULL >> ((8 - info->size) * 8);
+	if (field2 && info->size != 6)
+		limit = ~0ULL >> ((8 - info->size*2) * 8);
+
+	if (num > limit) {
+		fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
+			arg, info->name, limit);
+		return EINVAL;
+	}
+	n = num & mask;
+	switch (size) {
+	case 8:
+		/* Should never get here */
+		fprintf(stderr, "64-bit field %s has a second 64-bit field\n"
+			"defined; BUG?!?\n", info->name);
+		*u.ptr64 = 0;
+		break;
 	case 4:
-		*u.ptr32 = num;
+		*u.ptr32 = n;
 		break;
 	case 2:
-		*u.ptr16 = num;
+		*u.ptr16 = n;
 		break;
 	case 1:
-		*u.ptr8 = num;
+		*u.ptr8 = n;
+		break;
+	}
+	if (!field2)
+		return 0;
+	n = (size == 8) ? 0 : (num >> (size*8));
+	u.ptr8 = (__u8 *) field2;
+	if (info->size == 6)
+		size = 2;
+	switch (size) {
+	case 8:
+		*u.ptr64 = n;
+		break;
+	case 4:
+		*u.ptr32 = n;
+		break;
+	case 2:
+		*u.ptr16 = n;
+		break;
+	case 1:
+		*u.ptr8 = n;
 		break;
 	}
 	return 0;
 }
 
-static errcode_t parse_int(struct field_set_info *info, char *arg)
+static errcode_t parse_int(struct field_set_info *info,
+			   char *field EXT2FS_ATTR((unused)), char *arg)
 {
 	long	num;
 	char *tmp;
@@ -259,7 +557,8 @@ static errcode_t parse_int(struct field_set_info *info, char *arg)
 	return 0;
 }
 
-static errcode_t parse_string(struct field_set_info *info, char *arg)
+static errcode_t parse_string(struct field_set_info *info,
+			      char *field EXT2FS_ATTR((unused)), char *arg)
 {
 	char	*cp = (char *) info->ptr;
 
@@ -272,42 +571,39 @@ static errcode_t parse_string(struct field_set_info *info, char *arg)
 	return 0;
 }
 
-static errcode_t parse_time(struct field_set_info *info, char *arg)
+static errcode_t parse_time(struct field_set_info *info,
+			    char *field, char *arg)
 {
-	struct	tm	ts;
-	__u32		*ptr32;
+	__s64		t;
+	__u32		t_low, t_high;
+	__u32		*ptr_low, *ptr_high;
 
-	ptr32 = (__u32 *) info->ptr;
+	if (check_suffix(field))
+		return parse_uint(info, field, arg);
 
-	if (strcmp(arg, "now") == 0) {
-		*ptr32 = time(0);
-		return 0;
-	}
-	memset(&ts, 0, sizeof(ts));
-#ifdef HAVE_STRPTIME
-	strptime(arg, "%Y%m%d%H%M%S", &ts);
-#else
-	sscanf(arg, "%4d%2d%2d%2d%2d%2d", &ts.tm_year, &ts.tm_mon,
-	       &ts.tm_mday, &ts.tm_hour, &ts.tm_min, &ts.tm_sec);
-	ts.tm_year -= 1900;
-	ts.tm_mon -= 1;
-	if (ts.tm_year < 0 || ts.tm_mon < 0 || ts.tm_mon > 11 ||
-	    ts.tm_mday < 0 || ts.tm_mday > 31 || ts.tm_hour > 23 ||
-	    ts.tm_min > 59 || ts.tm_sec > 61)
-		ts.tm_mday = 0;
-#endif
-	if (ts.tm_mday == 0) {
-		/* Try it as an integer... */
-		return parse_uint(info, arg);
+	ptr_low  = (__u32 *) info->ptr;
+	ptr_high = (__u32 *) info->ptr2;
+
+	t = string_to_time(arg);
+
+	if (t == -1) {
+		fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
+			arg, info->name);
+		return EINVAL;
 	}
-	*ptr32 = mktime(&ts);
+	t_low = (__u32) t;
+	t_high = ((t - (__s32)t) >> 32) & EXT4_EPOCH_MASK;
+	*ptr_low = t_low;
+	if (ptr_high)
+		*ptr_high = (*ptr_high & ~EXT4_EPOCH_MASK) | t_high;
 	return 0;
 }
 
-static errcode_t parse_uuid(struct field_set_info *info, char *arg)
+static errcode_t parse_uuid(struct field_set_info *info,
+			    char *field EXT2FS_ATTR((unused)), char *arg)
 {
 	unsigned char *	p = (unsigned char *) info->ptr;
-	
+
 	if ((strcasecmp(arg, "null") == 0) ||
 	    (strcasecmp(arg, "clear") == 0)) {
 		uuid_clear(p);
@@ -322,7 +618,8 @@ static errcode_t parse_uuid(struct field_set_info *info, char *arg)
 	return 0;
 }
 
-static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
+static errcode_t parse_hashalg(struct field_set_info *info,
+			       char *field EXT2FS_ATTR((unused)), char *arg)
 {
 	int	hashv;
 	unsigned char	*p = (unsigned char *) info->ptr;
@@ -336,28 +633,116 @@ static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
 	return 0;
 }
 
-static errcode_t parse_bmap(struct field_set_info *info, char *arg)
+static errcode_t parse_encoding(struct field_set_info *info,
+				char *field EXT2FS_ATTR((unused)), char *arg)
+{
+	int	encoding;
+	unsigned char	*p = (unsigned char *) info->ptr;
+
+	encoding = e2p_str2encoding(arg);
+	if (encoding < 0)
+		return parse_uint(info, field, arg);
+	*p = encoding;
+	return 0;
+}
+
+static errcode_t parse_bmap(struct field_set_info *info,
+			    char *field EXT2FS_ATTR((unused)), char *arg)
 {
-	unsigned long	num;
-	blk_t		blk;
+	blk64_t		blk;
 	errcode_t	retval;
 	char		*tmp;
 
-	num = strtoul(arg, &tmp, 0);
+	blk = strtoull(arg, &tmp, 0);
 	if (*tmp) {
 		fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
 			arg, info->name);
 		return EINVAL;
 	}
-	blk = num;
 
-	retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET, 
-			     array_idx, &blk);
+	retval = ext2fs_bmap2(current_fs, set_ino,
+			      (struct ext2_inode *) &set_inode,
+			      NULL, BMAP_ALLOC | BMAP_SET, array_idx, NULL,
+			      &blk);
 	if (retval) {
 		com_err("set_inode", retval, "while setting block map");
 	}
+	return retval;
+}
+
+static errcode_t parse_gd_csum(struct field_set_info *info, char *field,
+			       char *arg)
+{
+	__u16 *checksum = info->ptr;
+
+	if (strcmp(arg, "calc") == 0) {
+		*checksum = ext2fs_group_desc_csum(current_fs, set_bg);
+		printf("Checksum set to 0x%04x\n", *checksum);
+		return 0;
+	}
+	return parse_uint(info, field, arg);
 }
 
+static errcode_t parse_inode_csum(struct field_set_info *info, char *field,
+				  char *arg)
+{
+	errcode_t	retval = 0;
+	__u32		crc;
+	int		is_large_inode = 0;
+
+	if (strcmp(arg, "calc") == 0) {
+		size_t sz = EXT2_INODE_SIZE(current_fs->super);
+		struct ext2_inode_large *tmp_inode = NULL;
+
+		retval = ext2fs_get_mem(sz, &tmp_inode);
+		if (retval)
+			goto out;
+
+		retval = ext2fs_read_inode_full(current_fs, set_ino,
+				     (struct ext2_inode *) tmp_inode,
+				     sz);
+		if (retval)
+			goto out;
+
+#ifdef WORDS_BIGENDIAN
+		ext2fs_swap_inode_full(current_fs, tmp_inode,
+				       tmp_inode, 1, sz);
+#endif
+
+		if (sz > EXT2_GOOD_OLD_INODE_SIZE)
+			is_large_inode = 1;
+
+		retval = ext2fs_inode_csum_set(current_fs, set_ino,
+					       tmp_inode);
+		if (retval)
+			goto out;
+#ifdef WORDS_BIGENDIAN
+		crc = set_inode.i_checksum_lo =
+			ext2fs_swab16(tmp_inode->i_checksum_lo);
+
+#else
+		crc = set_inode.i_checksum_lo = tmp_inode->i_checksum_lo;
+#endif
+		if (is_large_inode &&
+		    set_inode.i_extra_isize >=
+				(offsetof(struct ext2_inode_large,
+					  i_checksum_hi) -
+				 EXT2_GOOD_OLD_INODE_SIZE)) {
+#ifdef WORDS_BIGENDIAN
+			set_inode.i_checksum_lo =
+				ext2fs_swab16(tmp_inode->i_checksum_lo);
+#else
+			set_inode.i_checksum_hi = tmp_inode->i_checksum_hi;
+#endif
+			crc |= ((__u32)set_inode.i_checksum_hi) << 16;
+		}
+		printf("Checksum set to 0x%08x\n", crc);
+	out:
+		ext2fs_free_mem(&tmp_inode);
+		return retval;
+	}
+	return parse_uint(info, field, arg);
+}
 
 static void print_possible_fields(struct field_set_info *fields)
 {
@@ -369,9 +754,15 @@ static void print_possible_fields(struct field_set_info *fields)
 	if (fields == super_fields) {
 		type = "Superblock";
 		cmd = "set_super_value";
-	} else {
+	} else if (fields == inode_fields) {
 		type = "Inode";
 		cmd = "set_inode";
+	} else if (fields == mmp_fields) {
+		type = "MMP";
+		cmd = "set_mmp_value";
+	} else {
+		type = "Block group descriptor";
+		cmd = "set_block_group";
 	}
 	f = open_pager();
 
@@ -393,27 +784,32 @@ static void print_possible_fields(struct field_set_info *fields)
 			type = "date/time";
 		else if (ss->func == parse_bmap)
 			type = "set physical->logical block map";
+		else if (ss->func == parse_gd_csum)
+			type = "unsigned integer OR \"calc\"";
 		strcpy(name, ss->name);
 		if (ss->flags & FLAG_ARRAY) {
-			if (ss->max_idx > 0) 
+			if (ss->max_idx > 0)
 				sprintf(idx, "[%d]", ss->max_idx);
 			else
 				strcpy(idx, "[]");
 			strcat(name, idx);
 		}
-		fprintf(f, "\t%-20s\t%s\n", name, type);
+		if (ss->ptr2)
+			strcat(name, "[_hi|_lo]");
+		fprintf(f, "\t%-25s\t%s\n", name, type);
 	}
 	close_pager(f);
 }
 
 
-void do_set_super(int argc, char *argv[])
+void do_set_super(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
+		  void *infop EXT2FS_ATTR((unused)))
 {
 	const char *usage = "<field> <value>\n"
 		"\t\"set_super_value -l\" will list the names of "
 		"superblock fields\n\twhich can be set.";
 	static struct field_set_info *ss;
-	
+
 	if ((argc == 2) && !strcmp(argv[1], "-l")) {
 		print_possible_fields(super_fields);
 		return;
@@ -428,19 +824,20 @@ void do_set_super(int argc, char *argv[])
 		return;
 	}
 	set_sb = *current_fs->super;
-	if (ss->func(ss, argv[2]) == 0) {
+	if (ss->func(ss, argv[1], argv[2]) == 0) {
 		*current_fs->super = set_sb;
 		ext2fs_mark_super_dirty(current_fs);
 	}
 }
 
-void do_set_inode(int argc, char *argv[])
+void do_set_inode(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
+		  void *infop EXT2FS_ATTR((unused)))
 {
 	const char *usage = "<inode> <field> <value>\n"
 		"\t\"set_inode_field -l\" will list the names of "
 		"the fields in an ext2 inode\n\twhich can be set.";
 	static struct field_set_info *ss;
-	
+
 	if ((argc == 2) && !strcmp(argv[1], "-l")) {
 		print_possible_fields(inode_fields);
 		return;
@@ -459,11 +856,168 @@ void do_set_inode(int argc, char *argv[])
 	if (!set_ino)
 		return;
 
-	if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
+	if (debugfs_read_inode2(set_ino,
+				(struct ext2_inode *) &set_inode, argv[1],
+				sizeof(set_inode),
+				(ss->flags & FLAG_CSUM) ?
+				READ_INODE_NOCSUM : 0))
 		return;
 
-	if (ss->func(ss, argv[3]) == 0) {
-		if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
+	if (ss->func(ss, argv[2], argv[3]) == 0) {
+		debugfs_write_inode2(set_ino,
+				     (struct ext2_inode *) &set_inode,
+				     argv[1], sizeof(set_inode),
+				     (ss->flags & FLAG_CSUM) ?
+				     WRITE_INODE_NOCSUM : 0);
+	}
+}
+
+void do_set_block_group_descriptor(int argc, char *argv[],
+				   int sci_idx EXT2FS_ATTR((unused)),
+				   void *infop EXT2FS_ATTR((unused)))
+{
+	const char *usage = "<bg number> <field> <value>\n"
+		"\t\"set_block_group -l\" will list the names of "
+		"the fields in a block group descriptor\n\twhich can be set.";
+	struct field_set_info	*table;
+	struct field_set_info	*ss;
+	char			*end;
+	void			*edit, *target;
+	int			size;
+
+	/*
+	 * Determine whether we are editing an ext2 or ext4 block group
+	 * descriptor.  Descriptors larger than ext4_group_desc cannot
+	 * have their fields edited yet, because they do not have any
+	 * names assigned.  When that happens, this function needs to
+	 * be updated for the new descriptor struct and fields.
+	 */
+	if (current_fs &&
+	    EXT2_DESC_SIZE(current_fs->super) >= EXT2_MIN_DESC_SIZE_64BIT) {
+		table = ext4_bg_fields;
+		edit = &set_gd4;
+		size = sizeof(set_gd4);
+	} else {
+		table = ext2_bg_fields;
+		edit = &set_gd;
+		size = sizeof(set_gd);
+	}
+
+	if ((argc == 2) && !strcmp(argv[1], "-l")) {
+		print_possible_fields(table);
+		return;
+	}
+
+	if (common_args_process(argc, argv, 4, 4, "set_block_group",
+				usage, CHECK_FS_RW))
+		return;
+
+	set_bg = strtoul(argv[1], &end, 0);
+	if (*end) {
+		com_err(argv[0], 0, "invalid block group number: %s", argv[1]);
+		return;
+	}
+
+	if (set_bg >= current_fs->group_desc_count) {
+		com_err(argv[0], 0, "block group number too big: %d", set_bg);
+		return;
+	}
+
+	if ((ss = find_field(table, argv[2])) == 0) {
+		com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
+		return;
+	}
+
+	target = ext2fs_group_desc(current_fs, current_fs->group_desc, set_bg);
+	memcpy(edit, target, size);
+	if (ss->func(ss, argv[2], argv[3]) == 0) {
+		memcpy(target, edit, size);
+		ext2fs_mark_super_dirty(current_fs);
+	}
+}
+
+static errcode_t parse_mmp_clear(struct field_set_info *info,
+				 char *field EXT2FS_ATTR((unused)),
+				 char *arg EXT2FS_ATTR((unused)))
+{
+	errcode_t retval;
+
+	retval = ext2fs_mmp_clear(current_fs);
+	if (retval != 0)
+		com_err("set_mmp_value", retval, "while clearing MMP block\n");
+	else
+		memcpy(info->ptr, current_fs->mmp_buf, info->size);
+
+	return 1; /* we don't need the MMP block written again */
+}
+
+#ifdef CONFIG_MMP
+void do_set_mmp_value(int argc, char *argv[], int sci_idx EXT2FS_ATTR((unused)),
+		      void *infop EXT2FS_ATTR((unused)))
+{
+	const char *usage = "<field> <value>\n"
+		"\t\"set_mmp_value -l\" will list the names of "
+		"MMP fields\n\twhich can be set.";
+	static struct field_set_info *smmp;
+	struct mmp_struct *mmp_s;
+	errcode_t retval;
+
+	if (argc == 2 && strcmp(argv[1], "-l") == 0) {
+		print_possible_fields(mmp_fields);
+		return;
+	}
+
+	if (check_fs_open(argv[0]))
+		return;
+
+	if (current_fs->super->s_mmp_block == 0) {
+		com_err(argv[0], 0, "no MMP block allocated\n");
+		return;
+	}
+
+	if (common_args_process(argc, argv, 2, 3, "set_mmp_value",
+				usage, CHECK_FS_RW))
+		return;
+
+	mmp_s = current_fs->mmp_buf;
+	if (mmp_s == NULL) {
+		retval = ext2fs_get_mem(current_fs->blocksize, &mmp_s);
+		if (retval) {
+			com_err(argv[0], retval, "allocating MMP buffer\n");
+			return;
+		}
+		retval = ext2fs_mmp_read(current_fs,
+					 current_fs->super->s_mmp_block, mmp_s);
+		if (retval) {
+			com_err(argv[0], retval, "reading MMP block %llu.\n",
+				(long long)current_fs->super->s_mmp_block);
+			ext2fs_free_mem(&mmp_s);
 			return;
+		}
+		current_fs->mmp_buf = mmp_s;
+	}
+
+	smmp = find_field(mmp_fields, argv[1]);
+	if (smmp == 0) {
+		com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
+		return;
+	}
+
+	set_mmp = *mmp_s;
+	if (smmp->func(smmp, argv[1], argv[2]) == 0) {
+		ext2fs_mmp_write(current_fs, current_fs->super->s_mmp_block,
+				 &set_mmp);
+		*mmp_s = set_mmp;
 	}
 }
+#else
+void do_set_mmp_value(int argc EXT2FS_ATTR((unused)),
+		      char *argv[] EXT2FS_ATTR((unused)),
+		      int sci_idx EXT2FS_ATTR((unused)),
+		      void *infop EXT2FS_ATTR((unused)))
+{
+	fprintf(stdout, "MMP is unsupported, please recompile with "
+	                "--enable-mmp\n");
+}
+#endif
+