btrfs-vol.c

   1 /*
   2  * Copyright (C) 2007 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 _GNU_SOURCE
  20 #ifndef __CHECKER__
  21 #include <sys/ioctl.h>
  22 #include <sys/mount.h>
  23 #include "ioctl.h"
  24 #endif
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <getopt.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <unistd.h>
  32 #include <dirent.h>
  33 #include <uuid/uuid.h>
  34 #include "kerncompat.h"
  35 #include "ctree.h"
  36 #include "transaction.h"
  37 #include "utils.h"
  38 #include "volumes.h"
  39
  40 #ifdef __CHECKER__
  41 #define BLKGETSIZE64 0
  42 #define BTRFS_IOC_SNAP_CREATE 0
  43 #define BTRFS_IOC_ADD_DEV 0
  44 #define BTRFS_IOC_RM_DEV 0
  45 #define BTRFS_VOL_NAME_MAX 255
  46 struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
  47 static inline int ioctl(int fd, int define, void *arg) { return 0; }
  48 #endif
  49
  50 static void print_usage(void)
  51 {
  52         fprintf(stderr, "usage: btrfs-vol [options] mount_point\n");
  53         fprintf(stderr, "\t-a device add one device\n");
  54         fprintf(stderr, "\t-b balance chunks across all devices\n");
  55         fprintf(stderr, "\t-r device remove one device\n");
  56         exit(1);
  57 }
  58
  59 static struct option long_options[] = {
  60         /* { "byte-count", 1, NULL, 'b' }, */
  61         { "add", 1, NULL, 'a' },
  62         { "balance", 0, NULL, 'b' },
  63         { "remove", 1, NULL, 'r' },
  64         { 0, 0, 0, 0}
  65 };
  66
  67 int main(int ac, char **av)
  68 {
  69         struct stat st;
  70         char *device = NULL;
  71         char *mnt = NULL;
  72         int ret;
  73         int option_index = 0;
  74         int cmd = 0;
  75         int fd;
  76         int devfd = 0;
  77         DIR *dirstream;
  78         struct btrfs_ioctl_vol_args args;
  79         u64 dev_block_count = 0;
  80
  81         printf( "**\n"
  82                 "** WARNING: this program is considered deprecated\n"
  83                 "** Please consider to switch to the btrfs utility\n"
  84                 "**\n");
  85
  86         while(1) {
  87                 int c;
  88                 c = getopt_long(ac, av, "a:br:", long_options,
  89                                 &option_index);
  90                 if (c < 0)
  91                         break;
  92                 switch(c) {
  93                         case 'a':
  94                                 device = strdup(optarg);
  95                                 cmd = BTRFS_IOC_ADD_DEV;
  96                                 break;
  97                         case 'b':
  98                                 cmd = BTRFS_IOC_BALANCE;
  99                                 break;
 100                         case 'r':
 101                                 device = strdup(optarg);
 102                                 cmd = BTRFS_IOC_RM_DEV;
 103                                 break;
 104                         default:
 105                                 print_usage();
 106                 }
 107         }
 108         ac = ac - optind;
 109         if (ac == 0)
 110                 print_usage();
 111         mnt = av[optind];
 112
 113         if (device && strcmp(device, "missing") == 0 &&
 114             cmd == BTRFS_IOC_RM_DEV) {
 115                 fprintf(stderr, "removing missing devices from %s\n", mnt);
 116         } else if (cmd != BTRFS_IOC_BALANCE) {
 117                 if (cmd == BTRFS_IOC_ADD_DEV) {
 118                         ret = check_mounted(device);
 119                         if (ret < 0) {
 120                                 fprintf(stderr,
 121                                         "error checking %s mount status\n",
 122                                         device);
 123                                 exit(1);
 124                         }
 125                         if (ret == 1) {
 126                                 fprintf(stderr, "%s is mounted\n", device);
 127                                 exit(1);
 128                         }
 129                 }
 130                 devfd = open(device, O_RDWR);
 131                 if (devfd < 0) {
 132                         fprintf(stderr, "Unable to open device %s\n", device);
 133                         exit(1);
 134                 }
 135                 ret = fstat(devfd, &st);
 136                 if (ret) {
 137                         fprintf(stderr, "Unable to stat %s\n", device);
 138                         exit(1);
 139                 }
 140                 if (!S_ISBLK(st.st_mode)) {
 141                         fprintf(stderr, "%s is not a block device\n", device);
 142                         exit(1);
 143                 }
 144         }
 145         dirstream = opendir(mnt);
 146         if (!dirstream) {
 147                 fprintf(stderr, "Unable to open directory %s\n", mnt);
 148                 exit(1);
 149         }
 150         if (cmd == BTRFS_IOC_ADD_DEV) {
 151                 int mixed = 0;
 152
 153                 ret = btrfs_prepare_device(devfd, device, 1, &dev_block_count, &mixed);
 154                 if (ret) {
 155                         fprintf(stderr, "Unable to init %s\n", device);
 156                         exit(1);
 157                 }
 158         }
 159         fd = dirfd(dirstream);
 160         if (device)
 161                 strcpy(args.name, device);
 162         else
 163                 args.name[0] = '\0';
 164
 165         ret = ioctl(fd, cmd, &args);
 166         printf("ioctl returns %d\n", ret);
 167         return 0;
 168 }
 169