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, &mixed);
 111                 if (res) {
 112                         fprintf(stderr, "ERROR: Unable to init '%s'\n", argv[i]);
 113                         close(devfd);
 114                         ret++;
 115                         continue;
 116                 }
 117                 close(devfd);
 118
 119                 strncpy(ioctl_args.name, argv[i], BTRFS_PATH_NAME_MAX);
 120                 res = ioctl(fdmnt, BTRFS_IOC_ADD_DEV, &ioctl_args);
 121                 e = errno;
 122                 if(res<0){
 123                         fprintf(stderr, "ERROR: error adding the device '%s' - %s\n",
 124                                 argv[i], strerror(e));
 125                         ret++;
 126                 }
 127
 128         }
 129
 130         close(fdmnt);
 131         if (ret)
 132                 return ret+20;
 133         else
 134                 return 0;
 135 }
 136
 137 static const char * const cmd_rm_dev_usage[] = {
 138         "btrfs device delete <device> [<device>...] <path>",
 139         "Remove a device from a filesystem",
 140         NULL
 141 };
 142
 143 static int cmd_rm_dev(int argc, char **argv)
 144 {
 145         char    *mntpnt;
 146         int     i, fdmnt, ret=0, e;
 147
 148         if (check_argc_min(argc, 3))
 149                 usage(cmd_rm_dev_usage);
 150
 151         mntpnt = argv[argc - 1];
 152
 153         fdmnt = open_file_or_dir(mntpnt);
 154         if (fdmnt < 0) {
 155                 fprintf(stderr, "ERROR: can't access to '%s'\n", mntpnt);
 156                 return 12;
 157         }
 158
 159         for(i=1 ; i < argc - 1; i++ ){
 160                 struct  btrfs_ioctl_vol_args arg;
 161                 int     res;
 162
 163                 strncpy(arg.name, argv[i], BTRFS_PATH_NAME_MAX);
 164                 res = ioctl(fdmnt, BTRFS_IOC_RM_DEV, &arg);
 165                 e = errno;
 166                 if(res<0){
 167                         fprintf(stderr, "ERROR: error removing the device '%s' - %s\n",
 168                                 argv[i], strerror(e));
 169                         ret++;
 170                 }
 171         }
 172
 173         close(fdmnt);
 174         if( ret)
 175                 return ret+20;
 176         else
 177                 return 0;
 178 }
 179
 180 static const char * const cmd_scan_dev_usage[] = {
 181         "btrfs device scan [<device>...]",
 182         "Scan devices for a btrfs filesystem",
 183         NULL
 184 };
 185
 186 static int cmd_scan_dev(int argc, char **argv)
 187 {
 188         int     i, fd, e;
 189         int     checklist = 1;
 190         int     devstart = 1;
 191
 192         if( argc > 1 && !strcmp(argv[1],"--all-devices")){
 193                 if (check_argc_max(argc, 2))
 194                         usage(cmd_scan_dev_usage);
 195
 196                 checklist = 0;
 197                 devstart += 1;
 198         }
 199
 200         if(argc<=devstart){
 201
 202                 int ret;
 203
 204                 printf("Scanning for Btrfs filesystems\n");
 205                 if(checklist)
 206                         ret = btrfs_scan_block_devices(1);
 207                 else
 208                         ret = btrfs_scan_one_dir("/dev", 1);
 209                 if (ret){
 210                         fprintf(stderr, "ERROR: error %d while scanning\n", ret);
 211                         return 18;
 212                 }
 213                 return 0;
 214         }
 215
 216         fd = open("/dev/btrfs-control", O_RDWR);
 217         if (fd < 0) {
 218                 perror("failed to open /dev/btrfs-control");
 219                 return 10;
 220         }
 221
 222         for( i = devstart ; i < argc ; i++ ){
 223                 struct btrfs_ioctl_vol_args args;
 224                 int ret;
 225
 226                 printf("Scanning for Btrfs filesystems in '%s'\n", argv[i]);
 227
 228                 strncpy(args.name, argv[i], BTRFS_PATH_NAME_MAX);
 229                 /*
 230                  * FIXME: which are the error code returned by this ioctl ?
 231                  * it seems that is impossible to understand if there no is
 232                  * a btrfs filesystem from an I/O error !!!
 233                  */
 234                 ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
 235                 e = errno;
 236
 237                 if( ret < 0 ){
 238                         close(fd);
 239                         fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
 240                                 argv[i], strerror(e));
 241                         return 11;
 242                 }
 243         }
 244
 245         close(fd);
 246         return 0;
 247 }
 248
 249 const struct cmd_group device_cmd_group = {
 250         device_cmd_group_usage, NULL, {
 251                 { "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
 252                 { "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
 253                 { "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },
 254                 { 0, 0, 0, 0, 0 }
 255         }
 256 };
 257
 258 int cmd_device(int argc, char **argv)
 259 {
 260         return handle_command_group(&device_cmd_group, argc, argv);
 261 }