diff options
Diffstat (limited to 'btrfslabel.c')
-rw-r--r-- | btrfslabel.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/btrfslabel.c b/btrfslabel.c new file mode 100644 index 00000000..c9f46844 --- /dev/null +++ b/btrfslabel.c @@ -0,0 +1,121 @@ +/* + * Copyright (C) 2008 Morey Roof. 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 _GNU_SOURCE + +#ifndef __CHECKER__ +#include <sys/ioctl.h> +#include <sys/mount.h> +#include "ioctl.h" +#endif /* __CHECKER__ */ + +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <dirent.h> +#include <fcntl.h> +#include <unistd.h> +#include <linux/fs.h> +#include <linux/limits.h> +#include <ctype.h> +#include "kerncompat.h" +#include "ctree.h" +#include "utils.h" +#include "version.h" +#include "disk-io.h" +#include "transaction.h" + +#define MOUNTED 1 +#define UNMOUNTED 2 +#define GET_LABEL 3 +#define SET_LABEL 4 + +static void change_label_unmounted(char *dev, char *nLabel) +{ + struct btrfs_root *root; + struct btrfs_trans_handle *trans; + + /* Open the super_block at the default location + * and as read-write. + */ + root = open_ctree(dev, 0, 1); + + trans = btrfs_start_transaction(root, 1); + strncpy(root->fs_info->super_copy.label, nLabel, BTRFS_LABEL_SIZE); + btrfs_commit_transaction(trans, root); + + /* Now we close it since we are done. */ + close_ctree(root); +} + +static void get_label_unmounted(char *dev) +{ + struct btrfs_root *root; + + /* Open the super_block at the default location + * and as read-only. + */ + root = open_ctree(dev, 0, 0); + + fprintf(stdout, "%s\n", root->fs_info->super_copy.label); + + /* Now we close it since we are done. */ + close_ctree(root); +} + +int get_label(char *btrfs_dev) +{ + + int ret; + ret = check_mounted(btrfs_dev); + if (ret < 0) + { + fprintf(stderr, "FATAL: error checking %s mount status\n", btrfs_dev); + return -1; + } + + if(ret != 0) + { + fprintf(stderr, "FATAL: the filesystem has to be unmounted\n"); + return -2; + } + get_label_unmounted(btrfs_dev); + return 0; +} + + +int set_label(char *btrfs_dev, char *nLabel) +{ + + int ret; + ret = check_mounted(btrfs_dev); + if (ret < 0) + { + fprintf(stderr, "FATAL: error checking %s mount status\n", btrfs_dev); + return -1; + } + + if(ret != 0) + { + fprintf(stderr, "FATAL: the filesystem has to be unmounted\n"); + return -2; + } + change_label_unmounted(btrfs_dev, nLabel); + return 0; +} |