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.
24 #include "kerncompat.h"
28 #include "print-tree.h"
29 #include "transaction.h"
33 static void print_usage(void)
35 fprintf(stderr
, "usage: btrfs-select-super -s number dev\n");
36 fprintf(stderr
, "%s\n", PACKAGE_STRING
);
40 int main(int argc
, char **argv
)
42 struct btrfs_root
*root
;
49 c
= getopt(argc
, argv
, "s:");
54 num
= arg_strtou64(optarg
);
55 if (num
>= BTRFS_SUPER_MIRROR_MAX
) {
57 "ERROR: super mirror should be less than: %d\n",
58 BTRFS_SUPER_MIRROR_MAX
);
61 bytenr
= btrfs_sb_offset(((int)num
));
68 if (check_argc_exact(argc
- optind
, 1))
72 fprintf(stderr
, "Please select the super copy with -s\n");
78 if((ret
= check_mounted(argv
[optind
])) < 0) {
79 error("cannot check mount status: %s", strerror(-ret
));
82 error("%s is currently mounted, aborting", argv
[optind
]);
86 root
= open_ctree(argv
[optind
], bytenr
, 1);
89 fprintf(stderr
, "Open ctree failed\n");
93 /* make the super writing code think we've read the first super */
94 root
->fs_info
->super_bytenr
= BTRFS_SUPER_INFO_OFFSET
;
95 ret
= write_all_supers(root
);
97 /* we don't close the ctree or anything, because we don't want a real
98 * transaction commit. We just want the super copy we pulled off the
99 * disk to overwrite all the other copies
101 printf("using SB copy %llu, bytenr %llu\n", (unsigned long long)num
,
102 (unsigned long long)bytenr
);
104 btrfs_close_all_devices();