cmds-device.c

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public
   4  * License v2 as published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   9  * General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public
  12  * License along with this program; if not, write to the
  13  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14  * Boston, MA 021110-1307, USA.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22 #include <sys/ioctl.h>
  23 #include <errno.h>
  24 #include <sys/stat.h>
  25
  26 #include "kerncompat.h"
  27 #include "ctree.h"
  28 #include "ioctl.h"
  29 #include "utils.h"
  30
  31 #include "commands.h"
  32
  33 /* FIXME - imported cruft, fix sparse errors and warnings */
  34 #ifdef __CHECKER__
  35 #define BLKGETSIZE64 0
  36 #define BTRFS_IOC_SNAP_CREATE_V2 0
  37 #define BTRFS_VOL_NAME_MAX 255
  38 struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
  39 static inline int ioctl(int fd, int define, void *arg) { return 0; }
  40 #endif
  41
  42 static const char * const device_cmd_group_usage[] = {
  43         "btrfs device <command> [<args>]",
  44         NULL
  45 };
  46
  47 static const char * const cmd_add_dev_usage[] = {
  48         "btrfs device add <device> [<device>...] <path>",
  49         "Add a device to a filesystem",
  50         NULL
  51 };
  52
  53 static int cmd_add_dev(int argc, char **argv)
  54 {
  55         char    *mntpnt;
  56         int     i, fdmnt, ret=0, e;
  57
  58         if (check_argc_min(argc, 3))
  59                 usage(cmd_add_dev_usage);
  60
  61         mntpnt = argv[argc - 1];
  62
  63         fdmnt = open_file_or_dir(mntpnt);
  64         if (fdmnt < 0) {
  65                 fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
  66                 return 12;
  67         }
  68
  69         for (i = 1; i < argc - 1; i++ ){
  70                 struct btrfs_ioctl_vol_args ioctl_args;
  71                 int     devfd, res;
  72                 u64 dev_block_count = 0;
  73                 struct stat st;
  74                 int mixed = 0;
  75
  76                 res = check_mounted(argv[i]);
  77                 if (res < 0) {
  78                         fprintf(stderr, "error checking %s mount status\n",
  79                                 argv[i]);
  80                         ret++;
  81                         continue;
  82                 }
  83                 if (res == 1) {
  84                         fprintf(stderr, "%s is mounted\n", argv[i]);
  85                         ret++;
  86                         continue;
  87                 }
  88
  89                 devfd = open(argv[i], O_RDWR);
  90                 if (!devfd) {
  91                         fprintf(stderr, "ERROR: Unable to open device '%s'\n", argv[i]);
  92                         close(devfd);
  93                         ret++;
  94                         continue;
  95                 }
  96                 res = fstat(devfd, &st);
  97                 if (res) {
  98                         fprintf(stderr, "ERROR: Unable to stat '%s'\n", argv[i]);
  99                         close(devfd);
 100                         ret++;
 101                         continue;
 102                 }
 103                 if (!S_ISBLK(st.st_mode)) {
 104                         fprintf(stderr, "ERROR: '%s' is not a block device\n", argv[i]);
 105                         close(devfd);
 106                         ret++;
 107                         continue;
 108                 }
 109
 110                 res = btrfs_prepare_device(devfd, argv[i], 1, &dev_block_count,
 111                                            0, &mixed, 0);
 112                 if (res) {
 113                         fprintf(stderr, "ERROR: Unable to init '%s'\n", argv[i]);
 114                         close(devfd);
 115                         ret++;
 116                         continue;
 117                 }
 118                 close(devfd);
 119
 120                 strncpy(ioctl_args.name, argv[i], BTRFS_PATH_NAME_MAX);
 121                 ioctl_args.name[BTRFS_PATH_NAME_MAX-1] = 0;
 122                 res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
 123                 e = errno;
 124                 if(res<0){
 125                         fprintf(stderr, "ERROR: error adding the device '%s' - %s\n",
 126                                 argv[i], strerror(e));
 127                         ret++;
 128                 }
 129
 130         }
 131
 132         close(fdmnt);
 133         if (ret)
 134                 return ret+20;
 135         else
 136                 return 0;
 137 }
 138
 139 static const char * const cmd_rm_dev_usage[] = {
 140         "btrfs device delete <device> [<device>...] <path>",
 141         "Remove a device from a filesystem",
 142         NULL
 143 };
 144
 145 static int cmd_rm_dev(int argc, char **argv)
 146 {
 147         char    *mntpnt;
 148         int     i, fdmnt, ret=0, e;
 149
 150         if (check_argc_min(argc, 3))
 151                 usage(cmd_rm_dev_usage);
 152
 153         mntpnt = argv[argc - 1];
 154
 155         fdmnt = open_file_or_dir(mntpnt);
 156         if (fdmnt < 0) {
 157                 fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
 158                 return 12;
 159         }
 160
 161         for(i=1 ; i < argc - 1; i++ ){
 162                 struct  btrfs_ioctl_vol_args arg;
 163                 int     res;
 164
 165                 strncpy(arg.name, argv[i], BTRFS_PATH_NAME_MAX);
 166                 arg.name[BTRFS_PATH_NAME_MAX-1] = 0;
 167                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 168                 e = errno;
 169                 if(res<0){
 170                         fprintf(stderr, "ERROR: error removing the device '%s' - %s\n",
 171                                 argv[i], strerror(e));
 172                         ret++;
 173                 }
 174         }
 175
 176         close(fdmnt);
 177         if( ret)
 178                 return ret+20;
 179         else
 180                 return 0;
 181 }
 182
 183 static const char * const cmd_scan_dev_usage[] = {
 184         "btrfs device scan [<device>...]",
 185         "Scan devices for a btrfs filesystem",
 186         NULL
 187 };
 188
 189 static int cmd_scan_dev(int argc, char **argv)
 190 {
 191         int     i, fd, e;
 192         int     checklist = 1;
 193         int     devstart = 1;
 194
 195         if( argc > 1 && !strcmp(argv[1],"--all-devices")){
 196                 if (check_argc_max(argc, 2))
 197                         usage(cmd_scan_dev_usage);
 198
 199                 checklist = 0;
 200                 devstart += 1;
 201         }
 202
 203         if(argc<=devstart){
 204
 205                 int ret;
 206
 207                 printf("Scanning for Btrfs filesystems\n");
 208                 if(checklist)
 209                         ret = btrfs_scan_block_devices(1);
 210                 else
 211                         ret = btrfs_scan_one_dir("/dev", 1);
 212                 if (ret){
 213                         fprintf(stderr, "ERROR: error %d while scanning\n", ret);
 214                         return 18;
 215                 }
 216                 return 0;
 217         }
 218
 219         fd = open("/dev/btrfs-control", O_RDWR);
 220         if (fd < 0) {
 221                 perror("failed to open /dev/btrfs-control");
 222                 return 10;
 223         }
 224
 225         for( i = devstart ; i < argc ; i++ ){
 226                 struct btrfs_ioctl_vol_args args;
 227                 int ret;
 228
 229                 printf("Scanning for Btrfs filesystems in '%s'\n", argv[i]);
 230
 231                 strncpy(args.name, argv[i], BTRFS_PATH_NAME_MAX);
 232                 args.name[BTRFS_PATH_NAME_MAX-1] = 0;
 233                 /*
 234                  * FIXME: which are the error code returned by this ioctl ?
 235                  * it seems that is impossible to understand if there no is
 236                  * a btrfs filesystem from an I/O error !!!
 237                  */
 238                 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
 239                 e = errno;
 240
 241                 if( ret < 0 ){
 242                         close(fd);
 243                         fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
 244                                 argv[i], strerror(e));
 245                         return 11;
 246                 }
 247         }
 248
 249         close(fd);
 250         return 0;
 251 }
 252
 253 const struct cmd_group device_cmd_group = {
 254         device_cmd_group_usage, NULL, {
 255                 { "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
 256                 { "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
 257                 { "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
 258                 { 0, 0, 0, 0, 0 }
 259         }
 260 };
 261
 262 int cmd_device(int argc, char **argv)
 263 {
 264         return handle_command_group(&device_cmd_group, argc, argv);
 265 }