2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #define _XOPEN_SOURCE 500
26 #include "kerncompat.h"
29 #include "print-tree.h"
30 #include "transaction.h"
35 static void print_usage(void)
37 fprintf(stderr
, "usage: btrfs-select-super -s number dev\n");
38 fprintf(stderr
, "%s\n", BTRFS_BUILD_VERSION
);
42 int main(int ac
, char **av
)
44 struct btrfs_root
*root
;
51 c
= getopt(ac
, av
, "s:");
57 bytenr
= btrfs_sb_offset(num
);
58 printf("using SB copy %d, bytenr %llu\n", num
,
59 (unsigned long long)bytenr
);
71 fprintf(stderr
, "Please select the super copy with -s\n");
77 if((ret
= check_mounted(av
[optind
])) < 0) {
78 fprintf(stderr
, "Could not check mount status: %s\n", strerror(-ret
));
81 fprintf(stderr
, "%s is currently mounted. Aborting.\n", av
[optind
]);
85 root
= open_ctree(av
[optind
], bytenr
, 1);
90 /* make the super writing code think we've read the first super */
91 root
->fs_info
->super_bytenr
= BTRFS_SUPER_INFO_OFFSET
;
92 ret
= write_all_supers(root
);
94 /* we don't close the ctree or anything, because we don't want a real
95 * transaction commit. We just want the super copy we pulled off the
96 * disk to overwrite all the other copies