127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
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/*
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* Copyright (C) 2008 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#define _XOPEN_SOURCE 500
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#define _GNU_SOURCE 1
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <dirent.h>
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#include "kerncompat.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "utils.h"
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#include "version.h"
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static char *device;
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int update_seeding_flag(struct btrfs_root *root, int set_flag)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_super_block *disk_super;
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u64 super_flags;
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disk_super = &root->fs_info->super_copy;
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super_flags = btrfs_super_flags(disk_super);
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if (set_flag) {
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if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
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fprintf(stderr, "seeding flag is already set on %s\n",
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device);
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return 1;
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}
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super_flags |= BTRFS_SUPER_FLAG_SEEDING;
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} else {
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if (!(super_flags & BTRFS_SUPER_FLAG_SEEDING)) {
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fprintf(stderr, "seeding flag is not set on %s\n",
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device);
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return 1;
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}
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super_flags &= ~BTRFS_SUPER_FLAG_SEEDING;
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}
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trans = btrfs_start_transaction(root, 1);
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btrfs_set_super_flags(disk_super, super_flags);
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btrfs_commit_transaction(trans, root);
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return 0;
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}
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static void print_usage(void)
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{
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fprintf(stderr, "usage: btrfstune [options] device\n");
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fprintf(stderr, "\t-S value\tenable/disable seeding\n");
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}
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int main(int argc, char *argv[])
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{
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struct btrfs_root *root;
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int success = 0;
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int seeding_flag = 0;
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int seeding_value = 0;
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int ret;
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while(1) {
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int c = getopt(argc, argv, "S:");
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if (c < 0)
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break;
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switch(c) {
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case 'S':
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seeding_flag = 1;
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seeding_value = atoi(optarg);
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break;
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default:
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print_usage();
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return 1;
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}
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}
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argc = argc - optind;
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device = argv[optind];
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if (argc != 1) {
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print_usage();
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return 1;
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}
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if (check_mounted(device)) {
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fprintf(stderr, "%s is mounted\n", device);
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return 1;
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}
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root = open_ctree(device, 0, 1);
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if (seeding_flag) {
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ret = update_seeding_flag(root, seeding_value);
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if (!ret)
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success++;
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}
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if (success > 0) {
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ret = 0;
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} else {
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root->fs_info->readonly = 1;
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ret = 1;
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}
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close_ctree(root);
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return ret;
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}
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