| /* |
| * 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; |
| } |