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;
  75         int fd;
  76         int devfd;
  77         DIR *dirstream;
  78         struct btrfs_ioctl_vol_args args;
  79         u64 dev_block_count = 0;
  80
  81         while(1) {
  82                 int c;
  83                 c = getopt_long(ac, av, "a:br:", long_options,
  84                                 &option_index);
  85                 if (c < 0)
  86                         break;
  87                 switch(c) {
  88                         case 'a':
  89                                 device = strdup(optarg);
  90                                 cmd = BTRFS_IOC_ADD_DEV;
  91                                 break;
  92                         case 'b':
  93                                 cmd = BTRFS_IOC_BALANCE;
  94                                 break;
  95                         case 'r':
  96                                 device = strdup(optarg);
  97                                 cmd = BTRFS_IOC_RM_DEV;
  98                                 break;
  99                         default:
 100                                 print_usage();
 101                 }
 102         }
 103         ac = ac - optind;
 104         if (ac == 0)
 105                 print_usage();
 106         mnt = av[optind];
 107
 108         if (device) {
 109                 devfd = open(device, O_RDWR);
 110                 if (!devfd) {
 111                         fprintf(stderr, "Unable to open device %s\n", device);
 112                 }
 113                 ret = fstat(devfd, &st);
 114                 if (ret) {
 115                         fprintf(stderr, "Unable to stat %s\n", device);
 116                         exit(1);
 117                 }
 118                 if (!S_ISBLK(st.st_mode)) {
 119                         fprintf(stderr, "%s is not a block device\n", device);
 120                         exit(1);
 121                 }
 122         }
 123         dirstream = opendir(mnt);
 124         if (!dirstream) {
 125                 fprintf(stderr, "Unable to open directory %s\n", mnt);
 126                 exit(1);
 127         }
 128         if (cmd == BTRFS_IOC_ADD_DEV) {
 129                 ret = btrfs_prepare_device(devfd, device, 1, &dev_block_count);
 130                 if (ret) {
 131                         fprintf(stderr, "Unable to init %s\n", device);
 132                         exit(1);
 133                 }
 134         }
 135         fd = dirfd(dirstream);
 136         if (device)
 137                 strcpy(args.name, device);
 138         else
 139                 args.name[0] = '\0';
 140
 141         ret = ioctl(fd, cmd, &args);
 142         printf("ioctl returns %d\n", ret);
 143         return 0;
 144 }
 145