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e2fsprogs/debugfs/set_fields.c

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/*
* 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_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 *field, char *arg);
int flags;
int max_idx;
};
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, 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, 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, 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, NULL, 2,
parse_uint },
{ "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 },
{ "orphan_file_inum", &set_sb.s_orphan_file_inum, NULL, 4, parse_uint },
{ 0, 0, 0, 0 }
};
static struct field_set_info inode_fields[] = {
{ "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], 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 if (fields == inode_fields)
prefix = "i_";
else
prefix = "bg_";
prefix_len = strlen(prefix);
if (strncmp(field, prefix, prefix_len) == 0)
field += prefix_len;
arg = malloc(strlen(field)+1);
if (!arg)
return NULL;
strcpy(arg, field);
idx = strchr(arg, '[');
if (idx) {
*idx++ = 0;
delim = idx + strlen(idx) - 1;
if (!*idx || *delim != ']')
idx = 0;
else
*delim = 0;
}
/*
* Can we parse the number?
*/
if (idx) {
array_idx = strtol(idx, &tmp, 0);
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, arg) != 0)
continue;
}
free(arg);
return ss;
}
free(arg);
return NULL;
}
/*
* 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 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;
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;
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;
}
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:
*u.ptr64 = n;
break;
case 4:
*u.ptr32 = n;
break;
case 2:
*u.ptr16 = n;
break;
case 1:
*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:
/* 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 = 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 *field EXT2FS_ATTR((unused)), char *arg)
{
long num;
char *tmp;
__s32 *ptr32;
__s16 *ptr16;
__s8 *ptr8;
num = strtol(arg, &tmp, 0);
if (*tmp) {
fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
arg, info->name);
return EINVAL;
}
switch (info->size) {
case 4:
ptr32 = (__s32 *) info->ptr;
*ptr32 = num;
break;
case 2:
ptr16 = (__s16 *) info->ptr;
*ptr16 = num;
break;
case 1:
ptr8 = (__s8 *) info->ptr;
*ptr8 = num;
break;
}
return 0;
}
static errcode_t parse_string(struct field_set_info *info,
char *field EXT2FS_ATTR((unused)), char *arg)
{
char *cp = (char *) info->ptr;
if (strlen(arg) >= info->size) {
fprintf(stderr, "Error maximum size for %s is %d.\n",
info->name, info->size);
return EINVAL;
}
strcpy(cp, arg);
return 0;
}
static errcode_t parse_time(struct field_set_info *info,
char *field, char *arg)
{
__s64 t;
__u32 t_low, t_high;
__u32 *ptr_low, *ptr_high;
if (check_suffix(field))
return parse_uint(info, field, 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;
}
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 *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);
} else if (strcasecmp(arg, "time") == 0) {
uuid_generate_time(p);
} else if (strcasecmp(arg, "random") == 0) {
uuid_generate(p);
} else if (uuid_parse(arg, p)) {
fprintf(stderr, "Invalid UUID format: %s\n", arg);
return EINVAL;
}
return 0;
}
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;
hashv = e2p_string2hash(arg);
if (hashv < 0) {
fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
return EINVAL;
}
*p = hashv;
return 0;
}
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)
{
blk64_t blk;
errcode_t retval;
char *tmp;
blk = strtoull(arg, &tmp, 0);
if (*tmp) {
fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
arg, info->name);
return EINVAL;
}
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)
{
struct field_set_info *ss;
const char *type, *cmd;
FILE *f;
char name[40], idx[40];
if (fields == super_fields) {
type = "Superblock";
cmd = "set_super_value";
} 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();
fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
for (ss = fields ; ss->name ; ss++) {
type = "unknown";
if (ss->func == parse_string)
type = "string";
else if (ss->func == parse_int)
type = "integer";
else if (ss->func == parse_uint)
type = "unsigned integer";
else if (ss->func == parse_uuid)
type = "UUID";
else if (ss->func == parse_hashalg)
type = "hash algorithm";
else if (ss->func == parse_time)
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)
sprintf(idx, "[%d]", ss->max_idx);
else
strcpy(idx, "[]");
strcat(name, idx);
}
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[], 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;
}
if (common_args_process(argc, argv, 3, 3, "set_super_value",
usage, CHECK_FS_RW))
return;
if ((ss = find_field(super_fields, argv[1])) == 0) {
com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
return;
}
set_sb = *current_fs->super;
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[], 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;
}
if (common_args_process(argc, argv, 4, 4, "set_inode",
usage, CHECK_FS_RW))
return;
if ((ss = find_field(inode_fields, argv[2])) == 0) {
com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
return;
}
set_ino = string_to_inode(argv[1]);
if (!set_ino)
return;
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[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
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