| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #define _XOPEN_SOURCE 500 |
| #define _GNU_SOURCE 1 |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/stat.h> |
| #include "kerncompat.h" |
| #include "ctree.h" |
| #include "disk-io.h" |
| #include "print-tree.h" |
| #include "transaction.h" |
| #include "list.h" |
| #include "version.h" |
| #include "utils.h" |
| |
| static void print_usage(void) |
| { |
| fprintf(stderr, "usage: btrfs-select-super -s number dev\n"); |
| fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION); |
| exit(1); |
| } |
| |
| int main(int ac, char **av) |
| { |
| struct btrfs_root *root; |
| int ret; |
| int num; |
| u64 bytenr = 0; |
| |
| while(1) { |
| int c; |
| c = getopt(ac, av, "s:"); |
| if (c < 0) |
| break; |
| switch(c) { |
| case 's': |
| num = atol(optarg); |
| bytenr = btrfs_sb_offset(num); |
| printf("using SB copy %d, bytenr %llu\n", num, |
| (unsigned long long)bytenr); |
| break; |
| default: |
| print_usage(); |
| } |
| } |
| ac = ac - optind; |
| |
| if (ac != 1) |
| print_usage(); |
| |
| if (bytenr == 0) { |
| fprintf(stderr, "Please select the super copy with -s\n"); |
| print_usage(); |
| } |
| |
| radix_tree_init(); |
| |
| if((ret = check_mounted(av[optind])) < 0) { |
| fprintf(stderr, "Could not check mount status: %s\n", strerror(-ret)); |
| return ret; |
| } else if(ret) { |
| fprintf(stderr, "%s is currently mounted. Aborting.\n", av[optind]); |
| return -EBUSY; |
| } |
| |
| root = open_ctree(av[optind], bytenr, 1); |
| |
| if (root == NULL) |
| return 1; |
| |
| /* make the super writing code think we've read the first super */ |
| root->fs_info->super_bytenr = BTRFS_SUPER_INFO_OFFSET; |
| ret = write_all_supers(root); |
| |
| /* we don't close the ctree or anything, because we don't want a real |
| * transaction commit. We just want the super copy we pulled off the |
| * disk to overwrite all the other copies |
| */ |
| return ret; |
| } |