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* setsuper.c --- set a superblock value
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#include <sys/types.h>
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#include "uuid/uuid.h"
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static struct ext2_super_block set_sb;
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struct super_set_info {
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errcode_t (*func)(struct super_set_info *info, char *arg);
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static errcode_t parse_uint(struct super_set_info *info, char *arg);
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static errcode_t parse_int(struct super_set_info *info, char *arg);
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static errcode_t parse_string(struct super_set_info *info, char *arg);
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static errcode_t parse_uuid(struct super_set_info *info, char *arg);
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static errcode_t parse_hashalg(struct super_set_info *info, char *arg);
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static struct super_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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/* s_mtime (time_t) */
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/* s_wtime (time_t) */
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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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{ "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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/* s_lastcheck (time_t) */
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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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{ "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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{ "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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static struct super_set_info *find_field(char *field)
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struct super_set_info *ss;
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if (strncmp(field, "s_", 2) == 0)
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for (ss = super_fields ; ss->name ; ss++) {
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if (strcmp(ss->name, field) == 0)
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static errcode_t parse_uint(struct super_set_info *info, char *arg)
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num = strtoul(arg, &tmp, 0);
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fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
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switch (info->size) {
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ptr32 = (__u32 *) info->ptr;
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ptr16 = (__u16 *) info->ptr;
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ptr8 = (__u8 *) info->ptr;
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static errcode_t parse_int(struct super_set_info *info, char *arg)
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num = strtol(arg, &tmp, 0);
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fprintf(stderr, "Couldn't parse '%s' for field %s.\n",
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switch (info->size) {
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ptr32 = (__s32 *) info->ptr;
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ptr16 = (__s16 *) info->ptr;
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ptr8 = (__s8 *) info->ptr;
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static errcode_t parse_string(struct super_set_info *info, char *arg)
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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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static errcode_t parse_uuid(struct super_set_info *info, char *arg)
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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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} 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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} else if (uuid_parse(arg, p)) {
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fprintf(stderr, "Invalid UUID format: %s\n", arg);
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static errcode_t parse_hashalg(struct super_set_info *info, char *arg)
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unsigned char *p = (unsigned char *) info->ptr;
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hashv = e2p_string2hash(arg);
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fprintf(stderr, "Invalid hash algorithm: %s\n", arg);
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static void print_possible_fields(void)
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struct super_set_info *ss;
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printf("Superblock fields supported by the set_super_value command:\n");
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for (ss = super_fields ; ss->name ; ss++) {
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if (ss->func == parse_string)
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else if (ss->func == parse_int)
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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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else if (ss->func == parse_hashalg)
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type = "hash algorithm";
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printf("\t%-20s\t%s\n", ss->name, type);
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void do_set_super(int argc, char *argv[])
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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 super_set_info *ss;
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if ((argc == 2) && !strcmp(argv[1], "-l")) {
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print_possible_fields();
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if (common_args_process(argc, argv, 3, 3, "set_super_value",
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if ((ss = find_field(argv[1])) == 0) {
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com_err(argv[0], 0, "invalid field specifier: %s", argv[1]);
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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);