btrfstune.c

   1 /*
   2  * Copyright (C) 2008 Oracle.  All rights reserved.
   3  *
   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.
   7  *
   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.
  12  *
  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.
  17  */
  18
  19 #define _XOPEN_SOURCE 500
  20 #define _GNU_SOURCE 1
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27 #include <dirent.h>
  28 #include "kerncompat.h"
  29 #include "ctree.h"
  30 #include "disk-io.h"
  31 #include "transaction.h"
  32 #include "utils.h"
  33 #include "version.h"
  34
  35 static char *device;
  36
  37 static int update_seeding_flag(struct btrfs_root *root, int set_flag)
  38 {
  39         struct btrfs_trans_handle *trans;
  40         struct btrfs_super_block *disk_super;
  41         u64 super_flags;
  42
  43         disk_super = root->fs_info->super_copy;
  44         super_flags = btrfs_super_flags(disk_super);
  45         if (set_flag) {
  46                 if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
  47                         fprintf(stderr, "seeding flag is already set on %s\n",
  48                                 device);
  49                         return 1;
  50                 }
  51                 super_flags |= BTRFS_SUPER_FLAG_SEEDING;
  52         } else {
  53                 if (!(super_flags & BTRFS_SUPER_FLAG_SEEDING)) {
  54                         fprintf(stderr, "seeding flag is not set on %s\n",
  55                                 device);
  56                         return 1;
  57                 }
  58                 super_flags &= ~BTRFS_SUPER_FLAG_SEEDING;
  59         }
  60
  61         trans = btrfs_start_transaction(root, 1);
  62         btrfs_set_super_flags(disk_super, super_flags);
  63         btrfs_commit_transaction(trans, root);
  64
  65         return 0;
  66 }
  67
  68 static int enable_extrefs_flag(struct btrfs_root *root)
  69 {
  70         struct btrfs_trans_handle *trans;
  71         struct btrfs_super_block *disk_super;
  72         u64 super_flags;
  73
  74         disk_super = root->fs_info->super_copy;
  75         super_flags = btrfs_super_incompat_flags(disk_super);
  76         super_flags |= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF;
  77         trans = btrfs_start_transaction(root, 1);
  78         btrfs_set_super_incompat_flags(disk_super, super_flags);
  79         btrfs_commit_transaction(trans, root);
  80
  81         return 0;
  82 }
  83
  84 static int enable_skinny_metadata(struct btrfs_root *root)
  85 {
  86         struct btrfs_trans_handle *trans;
  87         struct btrfs_super_block *disk_super;
  88         u64 super_flags;
  89
  90         disk_super = root->fs_info->super_copy;
  91         super_flags = btrfs_super_incompat_flags(disk_super);
  92         super_flags |= BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA;
  93         trans = btrfs_start_transaction(root, 1);
  94         btrfs_set_super_incompat_flags(disk_super, super_flags);
  95         btrfs_commit_transaction(trans, root);
  96
  97         return 0;
  98 }
  99
 100 static void print_usage(void)
 101 {
 102         fprintf(stderr, "usage: btrfstune [options] device\n");
 103         fprintf(stderr, "\t-S value\tenable/disable seeding\n");
 104         fprintf(stderr, "\t-r \t\tenable extended inode refs\n");
 105         fprintf(stderr, "\t-x enable skinny metadata extent refs\n");
 106 }
 107
 108 int main(int argc, char *argv[])
 109 {
 110         struct btrfs_root *root;
 111         int success = 0;
 112         int extrefs_flag = 0;
 113         int seeding_flag = 0;
 114         u64 seeding_value = 0;
 115         int skinny_flag = 0;
 116         int ret;
 117
 118         optind = 1;
 119         while(1) {
 120                 int c = getopt(argc, argv, "S:rx");
 121                 if (c < 0)
 122                         break;
 123                 switch(c) {
 124                 case 'S':
 125                         seeding_flag = 1;
 126                         seeding_value = arg_strtou64(optarg);
 127                         break;
 128                 case 'r':
 129                         extrefs_flag = 1;
 130                         break;
 131                 case 'x':
 132                         skinny_flag = 1;
 133                         break;
 134                 default:
 135                         print_usage();
 136                         return 1;
 137                 }
 138         }
 139
 140         argc = argc - optind;
 141         device = argv[optind];
 142         if (argc != 1) {
 143                 print_usage();
 144                 return 1;
 145         }
 146
 147         if (!(seeding_flag + extrefs_flag + skinny_flag)) {
 148                 fprintf(stderr,
 149                         "ERROR: At least one option should be assigned.\n");
 150                 print_usage();
 151                 return 1;
 152         }
 153
 154         ret = check_mounted(device);
 155         if (ret < 0) {
 156                 fprintf(stderr, "Could not check mount status: %s\n",
 157                         strerror(-ret));
 158                 return 1;
 159         } else if (ret) {
 160                 fprintf(stderr, "%s is mounted\n", device);
 161                 return 1;
 162         }
 163
 164         root = open_ctree(device, 0, OPEN_CTREE_WRITES);
 165
 166         if (!root) {
 167                 fprintf(stderr, "Open ctree failed\n");
 168                 return 1;
 169         }
 170
 171         if (seeding_flag) {
 172                 ret = update_seeding_flag(root, seeding_value);
 173                 if (!ret)
 174                         success++;
 175         }
 176
 177         if (extrefs_flag) {
 178                 enable_extrefs_flag(root);
 179                 success++;
 180         }
 181
 182         if (skinny_flag) {
 183                 enable_skinny_metadata(root);
 184                 success++;
 185         }
 186
 187         if (success > 0) {
 188                 ret = 0;
 189         } else {
 190                 root->fs_info->readonly = 1;
 191                 ret = 1;
 192                 fprintf(stderr, "btrfstune failed\n");
 193         }
 194         close_ctree(root);
 195
 196         return ret;
 197 }