/*
* 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 <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
#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"
static struct ext2_super_block set_sb;
static struct ext2_inode set_inode;
static struct ext2_group_desc set_gd;
static dgrp_t set_bg;
static ext2_ino_t set_ino;
static int array_idx;
#define FLAG_ARRAY 0x0001
struct field_set_info {
const char *name;
void *ptr;
unsigned int size;
errcode_t (*func)(struct field_set_info *info, 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_gd_csum(struct field_set_info *info, char *arg);
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 },
/* 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,
4, parse_uint },
{ "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
{ "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
parse_uint },
{ "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2,
parse_uint },
{ "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 },
{ "desc_size", &set_sb.s_desc_size, 2, parse_uint },
{ "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 },
{ "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY,
17 },
{ "blocks_count_hi", &set_sb.s_blocks_count_hi, 4, parse_uint },
{ "r_blocks_count_hi", &set_sb.s_r_blocks_count_hi, 4, parse_uint },
{ "min_extra_isize", &set_sb.s_min_extra_isize, 2, parse_uint },
{ "want_extra_isize", &set_sb.s_want_extra_isize, 2, parse_uint },
{ "flags", &set_sb.s_flags, 4, parse_uint },
{ "raid_stride", &set_sb.s_raid_stride, 2, parse_uint },
{ "min_extra_isize", &set_sb.s_min_extra_isize, 4, parse_uint },
{ "mmp_interval", &set_sb.s_mmp_interval, 2, parse_uint },
{ "mmp_block", &set_sb.s_mmp_block, 8, parse_uint },
{ "raid_stripe_width", &set_sb.s_raid_stripe_width, 4, parse_uint },
{ "log_groups_per_flex", &set_sb.s_log_groups_per_flex, 1, parse_uint },
{ "kbytes_written", &set_sb.s_kbytes_written, 8, parse_uint },
{ "snapshot_inum", &set_sb.s_snapshot_inum, 4, parse_uint },
{ "snapshot_id", &set_sb.s_snapshot_id, 4, parse_uint },
{ "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count, 8,
parse_uint },
{ "snapshot_list", &set_sb.s_snapshot_list, 4, parse_uint },
{ "mount_opts", &set_sb.s_mount_opts, 64, parse_string },
{ 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_size, 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 },
{ "version", &set_inode.osd1.linux1.l_i_version, 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,
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 },
{ "file_acl_high", &set_inode.osd2.linux2.l_i_file_acl_high, 2,
parse_uint },
{ "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
{ "size_high", &set_inode.i_size_high, 4, parse_uint },
{ "faddr", &set_inode.i_faddr, 4, parse_uint },
{ "blocks_hi", &set_inode.osd2.linux2.l_i_blocks_hi, 2, parse_uint },
{ "frag", &set_inode.osd2.hurd2.h_i_frag, 1, parse_uint },
{ "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint },
{ "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
{ "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
{ "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
{ "bmap", 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, 4, parse_uint },
{ "inode_bitmap", &set_gd.bg_inode_bitmap, 4, parse_uint },
{ "inode_table", &set_gd.bg_inode_table, 4, parse_uint },
{ "free_blocks_count", &set_gd.bg_free_blocks_count, 2, parse_uint },
{ "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
{ "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
{ "flags", &set_gd.bg_flags, 2, parse_uint },
{ "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
{ "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
{ "checksum", &set_gd.bg_checksum, 2, parse_gd_csum },
{ 0, 0, 0, 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 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 = 0;
}
for (ss = fields ; ss->name ; ss++) {
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)
continue;
}
free(arg);
return ss;
}
free(arg);
return NULL;
}
static errcode_t parse_uint(struct field_set_info *info, char *arg)
{
unsigned long long num, limit;
char *tmp;
union {
__u64 *ptr64;
__u32 *ptr32;
__u16 *ptr16;
__u8 *ptr8;
} u;
u.ptr8 = (__u8 *) info->ptr;
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;
}
limit = ~0ULL >> ((8 - info->size) * 8);
if (num > limit) {
fprintf(stderr, "Value '%s' exceeds field %s maximum %llu.\n",
arg, info->name, limit);
return EINVAL;
}
switch (info->size) {
case 8:
*u.ptr64 = num;
break;
case 4:
*u.ptr32 = num;
break;
case 2:
*u.ptr16 = num;
break;
case 1:
*u.ptr8 = num;
break;
}
return 0;
}
static errcode_t parse_int(struct field_set_info *info, 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 *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 *arg)
{
time_t t;
__u32 *ptr32;
ptr32 = (__u32 *) info->ptr;
t = string_to_time(arg);
if (t == ((time_t) -1)) {
fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
arg, info->name);
return EINVAL;
}
*ptr32 = t;
return 0;
}
static errcode_t parse_uuid(struct field_set_info *info, 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 *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_bmap(struct field_set_info *info, char *arg)
{
unsigned long num;
blk_t blk;
errcode_t retval;
char *tmp;
num = strtoul(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);
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 *arg)
{
if (strcmp(arg, "calc") == 0) {
ext2fs_group_desc_csum_set(current_fs, set_bg);
set_gd = current_fs->group_desc[set_bg];
printf("Checksum set to 0x%04x\n",
current_fs->group_desc[set_bg].bg_checksum);
return 0;
}
return parse_uint(info, 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 {
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";
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);
}
fprintf(f, "\t%-20s\t%s\n", name, type);
}
close_pager(f);
}
void do_set_super(int argc, char *argv[])
{
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[2]) == 0) {
*current_fs->super = set_sb;
ext2fs_mark_super_dirty(current_fs);
}
}
void do_set_inode(int argc, char *argv[])
{
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_inode(set_ino, &set_inode, argv[1]))
return;
if (ss->func(ss, argv[3]) == 0) {
if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
return;
}
}
void do_set_block_group_descriptor(int argc, char *argv[])
{
const char *usage = "<bg number> <field> <value>\n"
"\t\"set_block_group_descriptor -l\" will list the names of "
"the fields in a block group descriptor\n\twhich can be set.";
struct field_set_info *ss;
char *end;
if ((argc == 2) && !strcmp(argv[1], "-l")) {
print_possible_fields(ext2_bg_fields);
return;
}
if (common_args_process(argc, argv, 4, 4, "set_block_group_descriptor",
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(ext2_bg_fields, argv[2])) == 0) {
com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
return;
}
set_gd = current_fs->group_desc[set_bg];
if (ss->func(ss, argv[3]) == 0) {
current_fs->group_desc[set_bg] = set_gd;
ext2fs_mark_super_dirty(current_fs);
}
}