2 * Copyright (C) 2008 Morey Roof. 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.
22 #include <sys/ioctl.h>
23 #include <sys/mount.h>
25 #endif /* __CHECKER__ */
29 #include <sys/types.h>
35 #include <linux/limits.h>
37 #include "kerncompat.h"
42 #include "transaction.h"
49 static void change_label_unmounted(char *dev
, char *nLabel
)
51 struct btrfs_root
*root
;
52 struct btrfs_trans_handle
*trans
;
54 /* Open the super_block at the default location
57 root
= open_ctree(dev
, 0, 1);
59 trans
= btrfs_start_transaction(root
, 1);
60 strncpy(root
->fs_info
->super_copy
.label
, nLabel
, BTRFS_LABEL_SIZE
);
61 btrfs_commit_transaction(trans
, root
);
63 /* Now we close it since we are done. */
67 static void get_label_unmounted(char *dev
)
69 struct btrfs_root
*root
;
71 /* Open the super_block at the default location
74 root
= open_ctree(dev
, 0, 0);
76 fprintf(stdout
, "%s\n", root
->fs_info
->super_copy
.label
);
78 /* Now we close it since we are done. */
82 int get_label(char *btrfs_dev
)
86 ret
= check_mounted(btrfs_dev
);
89 fprintf(stderr
, "FATAL: error checking %s mount status\n", btrfs_dev
);
95 fprintf(stderr
, "FATAL: the filesystem has to be unmounted\n");
98 get_label_unmounted(btrfs_dev
);
103 int set_label(char *btrfs_dev
, char *nLabel
)
107 ret
= check_mounted(btrfs_dev
);
110 fprintf(stderr
, "FATAL: error checking %s mount status\n", btrfs_dev
);
116 fprintf(stderr
, "FATAL: the filesystem has to be unmounted\n");
119 change_label_unmounted(btrfs_dev
, nLabel
);