mirror of
https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
synced 2024-12-20 07:20:48 +08:00
461 lines
12 KiB
C
461 lines
12 KiB
C
/*
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* set_fields.c --- set a superblock value
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*
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* Copyright (C) 2000, 2001, 2002, 2003, 2004 by Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#define _XOPEN_SOURCE 500 /* for inclusion of strptime() */
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <fcntl.h>
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#include <utime.h>
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#include "debugfs.h"
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#include "uuid/uuid.h"
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#include "e2p/e2p.h"
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static struct ext2_super_block set_sb;
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static struct ext2_inode set_inode;
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static ext2_ino_t set_ino;
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static int array_idx;
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#define FLAG_ARRAY 0x0001
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struct field_set_info {
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const char *name;
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void *ptr;
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unsigned int size;
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errcode_t (*func)(struct field_set_info *info, char *arg);
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int flags;
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int max_idx;
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};
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static errcode_t parse_uint(struct field_set_info *info, char *arg);
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static errcode_t parse_int(struct field_set_info *info, char *arg);
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static errcode_t parse_string(struct field_set_info *info, char *arg);
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static errcode_t parse_uuid(struct field_set_info *info, char *arg);
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static errcode_t parse_hashalg(struct field_set_info *info, char *arg);
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static errcode_t parse_time(struct field_set_info *info, char *arg);
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static errcode_t parse_bmap(struct field_set_info *info, char *arg);
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static struct field_set_info super_fields[] = {
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{ "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
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{ "blocks_count", &set_sb.s_blocks_count, 4, parse_uint },
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{ "r_blocks_count", &set_sb.s_r_blocks_count, 4, parse_uint },
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{ "free_blocks_count", &set_sb.s_free_blocks_count, 4, parse_uint },
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{ "free_inodes_count", &set_sb.s_free_inodes_count, 4, parse_uint },
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{ "first_data_block", &set_sb.s_first_data_block, 4, parse_uint },
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{ "log_block_size", &set_sb.s_log_block_size, 4, parse_uint },
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{ "log_frag_size", &set_sb.s_log_frag_size, 4, parse_int },
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{ "blocks_per_group", &set_sb.s_blocks_per_group, 4, parse_uint },
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{ "frags_per_group", &set_sb.s_frags_per_group, 4, parse_uint },
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{ "inodes_per_group", &set_sb.s_inodes_per_group, 4, parse_uint },
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{ "mtime", &set_sb.s_mtime, 4, parse_time },
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{ "wtime", &set_sb.s_wtime, 4, parse_time },
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{ "mnt_count", &set_sb.s_mnt_count, 2, parse_uint },
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{ "max_mnt_count", &set_sb.s_max_mnt_count, 2, parse_int },
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/* s_magic */
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{ "state", &set_sb.s_state, 2, parse_uint },
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{ "errors", &set_sb.s_errors, 2, parse_uint },
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{ "minor_rev_level", &set_sb.s_minor_rev_level, 2, parse_uint },
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{ "lastcheck", &set_sb.s_lastcheck, 4, parse_time },
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{ "checkinterval", &set_sb.s_checkinterval, 4, parse_uint },
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{ "creator_os", &set_sb.s_creator_os, 4, parse_uint },
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{ "rev_level", &set_sb.s_rev_level, 4, parse_uint },
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{ "def_resuid", &set_sb.s_def_resuid, 2, parse_uint },
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{ "def_resgid", &set_sb.s_def_resgid, 2, parse_uint },
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{ "first_ino", &set_sb.s_first_ino, 4, parse_uint },
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{ "inode_size", &set_sb.s_inode_size, 2, parse_uint },
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{ "block_group_nr", &set_sb.s_block_group_nr, 2, parse_uint },
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{ "feature_compat", &set_sb.s_feature_compat, 4, parse_uint },
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{ "feature_incompat", &set_sb.s_feature_incompat, 4, parse_uint },
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{ "feature_ro_compat", &set_sb.s_feature_ro_compat, 4, parse_uint },
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{ "uuid", &set_sb.s_uuid, 16, parse_uuid },
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{ "volume_name", &set_sb.s_volume_name, 16, parse_string },
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{ "last_mounted", &set_sb.s_last_mounted, 64, parse_string },
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{ "lastcheck", &set_sb.s_lastcheck, 4, parse_uint },
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{ "algorithm_usage_bitmap", &set_sb.s_algorithm_usage_bitmap,
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4, parse_uint },
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{ "prealloc_blocks", &set_sb.s_prealloc_blocks, 1, parse_uint },
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{ "prealloc_dir_blocks", &set_sb.s_prealloc_dir_blocks, 1,
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parse_uint },
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{ "reserved_gdt_blocks", &set_sb.s_reserved_gdt_blocks, 2,
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parse_uint },
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/* s_padding1 */
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{ "journal_uuid", &set_sb.s_journal_uuid, 16, parse_uuid },
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{ "journal_inum", &set_sb.s_journal_inum, 4, parse_uint },
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{ "journal_dev", &set_sb.s_journal_dev, 4, parse_uint },
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{ "last_orphan", &set_sb.s_last_orphan, 4, parse_uint },
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{ "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid },
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{ "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg },
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{ "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint },
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/* s_reserved_word_pad */
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{ "default_mount_opts", &set_sb.s_default_mount_opts, 4, parse_uint },
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{ "first_meta_bg", &set_sb.s_first_meta_bg, 4, parse_uint },
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{ "mkfs_time", &set_sb.s_mkfs_time, 4, parse_time },
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{ "jnl_blocks", &set_sb.s_jnl_blocks[0], 4, parse_uint, FLAG_ARRAY,
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17 },
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{ 0, 0, 0, 0 }
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};
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static struct field_set_info inode_fields[] = {
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{ "inodes_count", &set_sb.s_inodes_count, 4, parse_uint },
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{ "mode", &set_inode.i_mode, 2, parse_uint },
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{ "uid", &set_inode.i_uid, 2, parse_uint },
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{ "size", &set_inode.i_size, 4, parse_uint },
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{ "atime", &set_inode.i_atime, 4, parse_time },
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{ "ctime", &set_inode.i_ctime, 4, parse_time },
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{ "mtime", &set_inode.i_mtime, 4, parse_time },
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{ "dtime", &set_inode.i_dtime, 4, parse_time },
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{ "gid", &set_inode.i_gid, 2, parse_uint },
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{ "links_count", &set_inode.i_links_count, 2, parse_uint },
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{ "blocks", &set_inode.i_blocks, 4, parse_uint },
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{ "flags", &set_inode.i_flags, 4, parse_uint },
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{ "translator", &set_inode.osd1.hurd1.h_i_translator, 4, parse_uint },
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{ "block", &set_inode.i_block[0], 4, parse_uint, FLAG_ARRAY,
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EXT2_NDIR_BLOCKS },
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{ "block[IND]", &set_inode.i_block[EXT2_IND_BLOCK], 4, parse_uint },
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{ "block[DIND]", &set_inode.i_block[EXT2_DIND_BLOCK], 4, parse_uint },
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{ "block[TIND]", &set_inode.i_block[EXT2_TIND_BLOCK], 4, parse_uint },
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{ "generation", &set_inode.i_generation, 4, parse_uint },
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{ "file_acl", &set_inode.i_file_acl, 4, parse_uint },
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{ "dir_acl", &set_inode.i_dir_acl, 4, parse_uint },
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{ "faddr", &set_inode.i_faddr, 4, parse_uint },
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{ "frag", &set_inode.osd2.linux2.l_i_frag, 1, parse_uint },
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{ "fsize", &set_inode.osd2.linux2.l_i_fsize, 1, parse_uint },
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{ "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
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{ "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
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{ "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
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{ "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
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{ 0, 0, 0, 0 }
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};
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static struct field_set_info *find_field(struct field_set_info *fields,
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char *field)
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{
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struct field_set_info *ss;
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const char *prefix;
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char *arg, *delim, *idx, *tmp;
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if (fields == super_fields)
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prefix = "s_";
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else
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prefix = "i_";
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if (strncmp(field, prefix, 2) == 0)
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field += 2;
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arg = malloc(strlen(field)+1);
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if (!arg)
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return NULL;
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strcpy(arg, field);
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idx = strchr(arg, '[');
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if (idx) {
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*idx++ = 0;
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delim = idx + strlen(idx) - 1;
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if (!*idx || *delim != ']')
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idx = 0;
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else
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*delim = 0;
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}
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/*
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* Can we parse the number?
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*/
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if (idx) {
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array_idx = strtol(idx, &tmp, 0);
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if (*tmp)
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idx = 0;
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}
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for (ss = fields ; ss->name ; ss++) {
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if (ss->flags & FLAG_ARRAY) {
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if (!idx || (strcmp(ss->name, arg) != 0))
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continue;
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if (ss->max_idx > 0 && array_idx >= ss->max_idx)
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continue;
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} else {
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if (strcmp(ss->name, field) != 0)
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continue;
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}
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return ss;
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}
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return NULL;
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}
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static errcode_t parse_uint(struct field_set_info *info, char *arg)
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{
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unsigned long num;
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char *tmp;
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union {
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__u32 *ptr32;
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__u16 *ptr16;
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__u8 *ptr8;
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} u;
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u.ptr8 = (__u8 *) info->ptr;
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if (info->flags & FLAG_ARRAY)
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u.ptr8 += array_idx * info->size;
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num = strtoul(arg, &tmp, 0);
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if (*tmp) {
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fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
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arg, info->name);
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return EINVAL;
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}
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switch (info->size) {
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case 4:
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*u.ptr32 = num;
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break;
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case 2:
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*u.ptr16 = num;
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break;
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case 1:
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*u.ptr8 = num;
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break;
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}
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return 0;
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}
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static errcode_t parse_int(struct field_set_info *info, char *arg)
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{
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long num;
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char *tmp;
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__s32 *ptr32;
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__s16 *ptr16;
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__s8 *ptr8;
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num = strtol(arg, &tmp, 0);
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if (*tmp) {
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fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
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arg, info->name);
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return EINVAL;
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}
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switch (info->size) {
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case 4:
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ptr32 = (__s32 *) info->ptr;
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*ptr32 = num;
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break;
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case 2:
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ptr16 = (__s16 *) info->ptr;
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*ptr16 = num;
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break;
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case 1:
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ptr8 = (__s8 *) info->ptr;
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*ptr8 = num;
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break;
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}
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return 0;
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}
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static errcode_t parse_string(struct field_set_info *info, char *arg)
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{
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char *cp = (char *) info->ptr;
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if (strlen(arg) >= info->size) {
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fprintf(stderr, "Error maximum size for %s is %d.\n",
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info->name, info->size);
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return EINVAL;
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}
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strcpy(cp, arg);
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return 0;
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}
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static errcode_t parse_time(struct field_set_info *info, char *arg)
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{
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time_t t;
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__u32 *ptr32;
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ptr32 = (__u32 *) info->ptr;
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t = string_to_time(arg);
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if (t == ((time_t) -1)) {
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fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
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arg, info->name);
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return EINVAL;
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}
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*ptr32 = t;
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return 0;
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}
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static errcode_t parse_uuid(struct field_set_info *info, char *arg)
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{
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unsigned char * p = (unsigned char *) info->ptr;
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if ((strcasecmp(arg, "null") == 0) ||
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(strcasecmp(arg, "clear") == 0)) {
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uuid_clear(p);
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} else if (strcasecmp(arg, "time") == 0) {
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uuid_generate_time(p);
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} else if (strcasecmp(arg, "random") == 0) {
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uuid_generate(p);
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} else if (uuid_parse(arg, p)) {
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fprintf(stderr, "Invalid UUID format: %s\n", arg);
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return EINVAL;
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}
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return 0;
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}
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static errcode_t parse_hashalg(struct field_set_info *info, char *arg)
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{
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int hashv;
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unsigned char *p = (unsigned char *) info->ptr;
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hashv = e2p_string2hash(arg);
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if (hashv < 0) {
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fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
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return EINVAL;
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}
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*p = hashv;
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return 0;
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}
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static errcode_t parse_bmap(struct field_set_info *info, char *arg)
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{
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unsigned long num;
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blk_t blk;
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errcode_t retval;
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char *tmp;
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num = strtoul(arg, &tmp, 0);
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if (*tmp) {
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fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
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arg, info->name);
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return EINVAL;
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}
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blk = num;
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retval = ext2fs_bmap(current_fs, set_ino, &set_inode, 0, BMAP_SET,
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array_idx, &blk);
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if (retval) {
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com_err("set_inode", retval, "while setting block map");
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}
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return retval;
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}
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static void print_possible_fields(struct field_set_info *fields)
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{
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struct field_set_info *ss;
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const char *type, *cmd;
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FILE *f;
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char name[40], idx[40];
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if (fields == super_fields) {
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type = "Superblock";
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cmd = "set_super_value";
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} else {
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type = "Inode";
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cmd = "set_inode";
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}
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f = open_pager();
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fprintf(f, "%s fields supported by the %s command:\n", type, cmd);
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for (ss = fields ; ss->name ; ss++) {
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type = "unknown";
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if (ss->func == parse_string)
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type = "string";
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else if (ss->func == parse_int)
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type = "integer";
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else if (ss->func == parse_uint)
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type = "unsigned integer";
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else if (ss->func == parse_uuid)
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type = "UUID";
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else if (ss->func == parse_hashalg)
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type = "hash algorithm";
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else if (ss->func == parse_time)
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type = "date/time";
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else if (ss->func == parse_bmap)
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type = "set physical->logical block map";
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strcpy(name, ss->name);
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if (ss->flags & FLAG_ARRAY) {
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if (ss->max_idx > 0)
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sprintf(idx, "[%d]", ss->max_idx);
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else
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strcpy(idx, "[]");
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strcat(name, idx);
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}
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fprintf(f, "\t%-20s\t%s\n", name, type);
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}
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close_pager(f);
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}
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void do_set_super(int argc, char *argv[])
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{
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const char *usage = "<field> <value>\n"
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"\t\"set_super_value -l\" will list the names of "
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"superblock fields\n\twhich can be set.";
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static struct field_set_info *ss;
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if ((argc == 2) && !strcmp(argv[1], "-l")) {
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print_possible_fields(super_fields);
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return;
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}
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if (common_args_process(argc, argv, 3, 3, "set_super_value",
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usage, CHECK_FS_RW))
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return;
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if ((ss = find_field(super_fields, argv[1])) == 0) {
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com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
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return;
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}
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set_sb = *current_fs->super;
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if (ss->func(ss, argv[2]) == 0) {
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*current_fs->super = set_sb;
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ext2fs_mark_super_dirty(current_fs);
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}
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}
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void do_set_inode(int argc, char *argv[])
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{
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const char *usage = "<inode> <field> <value>\n"
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"\t\"set_inode_field -l\" will list the names of "
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"the fields in an ext2 inode\n\twhich can be set.";
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static struct field_set_info *ss;
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if ((argc == 2) && !strcmp(argv[1], "-l")) {
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print_possible_fields(inode_fields);
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return;
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}
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if (common_args_process(argc, argv, 4, 4, "set_inode",
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usage, CHECK_FS_RW))
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return;
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if ((ss = find_field(inode_fields, argv[2])) == 0) {
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com_err(argv[0], 0, "invalid field specifier: %s", argv[2]);
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return;
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}
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set_ino = string_to_inode(argv[1]);
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if (!set_ino)
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return;
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if (debugfs_read_inode(set_ino, &set_inode, argv[1]))
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return;
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if (ss->func(ss, argv[3]) == 0) {
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if (debugfs_write_inode(set_ino, &set_inode, argv[1]))
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return;
|
|
}
|
|
}
|