| /* |
| * Copyright (C) 2008 Oracle. 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 _XOPEN_SOURCE 500 |
| #define _GNU_SOURCE 1 |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <dirent.h> |
| #include "kerncompat.h" |
| #include "ctree.h" |
| #include "disk-io.h" |
| #include "transaction.h" |
| #include "utils.h" |
| #include "version.h" |
| |
| static char *device; |
| |
| static int update_seeding_flag(struct btrfs_root *root, int set_flag) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_super_block *disk_super; |
| u64 super_flags; |
| |
| disk_super = root->fs_info->super_copy; |
| super_flags = btrfs_super_flags(disk_super); |
| if (set_flag) { |
| if (super_flags & BTRFS_SUPER_FLAG_SEEDING) { |
| fprintf(stderr, "seeding flag is already set on %s\n", |
| device); |
| return 1; |
| } |
| super_flags |= BTRFS_SUPER_FLAG_SEEDING; |
| } else { |
| if (!(super_flags & BTRFS_SUPER_FLAG_SEEDING)) { |
| fprintf(stderr, "seeding flag is not set on %s\n", |
| device); |
| return 1; |
| } |
| super_flags &= ~BTRFS_SUPER_FLAG_SEEDING; |
| fprintf(stderr, "Warning: Seeding flag cleared.\n"); |
| } |
| |
| trans = btrfs_start_transaction(root, 1); |
| btrfs_set_super_flags(disk_super, super_flags); |
| btrfs_commit_transaction(trans, root); |
| |
| return 0; |
| } |
| |
| static int enable_extrefs_flag(struct btrfs_root *root) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_super_block *disk_super; |
| u64 super_flags; |
| |
| disk_super = root->fs_info->super_copy; |
| super_flags = btrfs_super_incompat_flags(disk_super); |
| super_flags |= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF; |
| trans = btrfs_start_transaction(root, 1); |
| btrfs_set_super_incompat_flags(disk_super, super_flags); |
| btrfs_commit_transaction(trans, root); |
| |
| return 0; |
| } |
| |
| static int enable_skinny_metadata(struct btrfs_root *root) |
| { |
| struct btrfs_trans_handle *trans; |
| struct btrfs_super_block *disk_super; |
| u64 super_flags; |
| |
| disk_super = root->fs_info->super_copy; |
| super_flags = btrfs_super_incompat_flags(disk_super); |
| super_flags |= BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA; |
| trans = btrfs_start_transaction(root, 1); |
| btrfs_set_super_incompat_flags(disk_super, super_flags); |
| btrfs_commit_transaction(trans, root); |
| |
| return 0; |
| } |
| |
| static void print_usage(void) |
| { |
| fprintf(stderr, "usage: btrfstune [options] device\n"); |
| fprintf(stderr, "\t-S value\tpositive value will enable seeding, zero to disable, negative is not allowed\n"); |
| fprintf(stderr, "\t-r \t\tenable extended inode refs\n"); |
| fprintf(stderr, "\t-x \t\tenable skinny metadata extent refs\n"); |
| fprintf(stderr, "\t-f \t\tforce to clear flags, make sure that you are aware of the dangers\n"); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| struct btrfs_root *root; |
| int success = 0; |
| int extrefs_flag = 0; |
| int seeding_flag = 0; |
| u64 seeding_value = 0; |
| int skinny_flag = 0; |
| int force = 0; |
| int ret; |
| |
| optind = 1; |
| while(1) { |
| int c = getopt(argc, argv, "S:rxf"); |
| if (c < 0) |
| break; |
| switch(c) { |
| case 'S': |
| seeding_flag = 1; |
| seeding_value = arg_strtou64(optarg); |
| break; |
| case 'r': |
| extrefs_flag = 1; |
| break; |
| case 'x': |
| skinny_flag = 1; |
| break; |
| case 'f': |
| force = 1; |
| break; |
| default: |
| print_usage(); |
| return 1; |
| } |
| } |
| |
| set_argv0(argv); |
| argc = argc - optind; |
| device = argv[optind]; |
| if (check_argc_exact(argc, 1)) { |
| print_usage(); |
| return 1; |
| } |
| |
| if (!(seeding_flag + extrefs_flag + skinny_flag)) { |
| fprintf(stderr, |
| "ERROR: At least one option should be assigned.\n"); |
| print_usage(); |
| return 1; |
| } |
| |
| ret = check_mounted(device); |
| if (ret < 0) { |
| fprintf(stderr, "Could not check mount status: %s\n", |
| strerror(-ret)); |
| return 1; |
| } else if (ret) { |
| fprintf(stderr, "%s is mounted\n", device); |
| return 1; |
| } |
| |
| root = open_ctree(device, 0, OPEN_CTREE_WRITES); |
| |
| if (!root) { |
| fprintf(stderr, "Open ctree failed\n"); |
| return 1; |
| } |
| |
| if (seeding_flag) { |
| if (!seeding_value && !force) { |
| fprintf(stderr, "Warning: This is dangerous, clearing the seeding flag may cause the derived device not to be mountable!\n"); |
| ret = ask_user("We are going to clear the seeding flag, are you sure?"); |
| if (!ret) { |
| fprintf(stderr, "Clear seeding flag canceled\n"); |
| return 1; |
| } |
| } |
| |
| ret = update_seeding_flag(root, seeding_value); |
| if (!ret) |
| success++; |
| } |
| |
| if (extrefs_flag) { |
| enable_extrefs_flag(root); |
| success++; |
| } |
| |
| if (skinny_flag) { |
| enable_skinny_metadata(root); |
| success++; |
| } |
| |
| if (success > 0) { |
| ret = 0; |
| } else { |
| root->fs_info->readonly = 1; |
| ret = 1; |
| fprintf(stderr, "btrfstune failed\n"); |
| } |
| close_ctree(root); |
| |
| return ret; |
| } |