btrfsctl.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 #ifndef __CHECKER__
  20 #include <sys/ioctl.h>
  21 #include <sys/mount.h>
  22 #include "ioctl.h"
  23 #endif
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <dirent.h>
  31 #include <libgen.h>
  32 #include <stdlib.h>
  33 #include "kerncompat.h"
  34 #include "ctree.h"
  35 #include "transaction.h"
  36 #include "utils.h"
  37 #include "version.h"
  38
  39 #ifdef __CHECKER__
  40 #define BLKGETSIZE64 0
  41 #define BTRFS_IOC_SNAP_CREATE 0
  42 #define BTRFS_VOL_NAME_MAX 255
  43 struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
  44 static inline int ioctl(int fd, int define, void *arg) { return 0; }
  45 #endif
  46
  47 static void print_usage(void)
  48 {
  49         printf("usage: btrfsctl [ -d file|dir] [ -s snap_name subvol|tree ]\n");
  50         printf("                [-r size] [-A device] [-a] [-c] [-D dir .]\n");
  51         printf("\t-d filename: defragments one file\n");
  52         printf("\t-d directory: defragments the entire Btree\n");
  53         printf("\t-s snap_name dir: creates a new snapshot of dir\n");
  54         printf("\t-S subvol_name dir: creates a new subvolume\n");
  55         printf("\t-r [+-]size[gkm]: resize the FS by size amount\n");
  56         printf("\t-A device: scans the device file for a Btrfs filesystem\n");
  57         printf("\t-a: scans all devices for Btrfs filesystems\n");
  58         printf("\t-c: forces a single FS sync\n");
  59         printf("\t-D: delete snapshot\n");
  60         printf("\t-m [tree id] directory: set the default mounted subvolume"
  61                " to the [tree id] or the directory\n");
  62         printf("%s\n", BTRFS_BUILD_VERSION);
  63         exit(1);
  64 }
  65
  66 static int open_file_or_dir(const char *fname)
  67 {
  68         int ret;
  69         struct stat st;
  70         DIR *dirstream;
  71         int fd;
  72
  73         ret = stat(fname, &st);
  74         if (ret < 0) {
  75                 perror("stat:");
  76                 exit(1);
  77         }
  78         if (S_ISDIR(st.st_mode)) {
  79                 dirstream = opendir(fname);
  80                 if (!dirstream) {
  81                         perror("opendir");
  82                         exit(1);
  83                 }
  84                 fd = dirfd(dirstream);
  85         } else {
  86                 fd = open(fname, O_RDWR);
  87         }
  88         if (fd < 0) {
  89                 perror("open");
  90                 exit(1);
  91         }
  92         return fd;
  93 }
  94 int main(int ac, char **av)
  95 {
  96         char *fname = NULL;
  97         char *snap_location = NULL;
  98         int snap_fd = 0;
  99         int fd;
 100         int ret;
 101         struct btrfs_ioctl_vol_args args;
 102         char *name = NULL;
 103         int i;
 104         unsigned long command = 0;
 105         int len;
 106         char *pos;
 107         char *fullpath;
 108         u64 objectid = 0;
 109
 110         if (ac == 2 && strcmp(av[1], "-a") == 0) {
 111                 fprintf(stderr, "Scanning for Btrfs filesystems\n");
 112                 btrfs_scan_one_dir("/dev", 1);
 113                 exit(0);
 114         }
 115         for (i = 1; i < ac; i++) {
 116                 if (strcmp(av[i], "-s") == 0) {
 117                         if (i + 1 >= ac - 1) {
 118                                 fprintf(stderr, "-s requires an arg");
 119                                 print_usage();
 120                         }
 121                         fullpath = av[i + 1];
 122
 123                         snap_location = strdup(fullpath);
 124                         snap_location = dirname(snap_location);
 125
 126                         snap_fd = open_file_or_dir(snap_location);
 127
 128                         name = strdup(fullpath);
 129                         name = basename(name);
 130                         len = strlen(name);
 131
 132                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 133                                 fprintf(stderr,
 134                                      "snapshot name zero length or too long\n");
 135                                 exit(1);
 136                         }
 137                         if (strchr(name, '/')) {
 138                                 fprintf(stderr,
 139                                         "error: / not allowed in names\n");
 140                                 exit(1);
 141                         }
 142                         command = BTRFS_IOC_SNAP_CREATE;
 143                 } else if (strcmp(av[i], "-S") == 0) {
 144                         if (i + 1 >= ac - 1) {
 145                                 fprintf(stderr, "-S requires an arg");
 146                                 print_usage();
 147                         }
 148                         name = av[i + 1];
 149                         len = strlen(name);
 150                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 151                                 fprintf(stderr,
 152                                      "snapshot name zero length or too long\n");
 153                                 exit(1);
 154                         }
 155                         if (strchr(name, '/')) {
 156                                 fprintf(stderr,
 157                                         "error: / not allowed in names\n");
 158                                 exit(1);
 159                         }
 160                         command = BTRFS_IOC_SUBVOL_CREATE;
 161                 } else if (strcmp(av[i], "-d") == 0) {
 162                         if (i >= ac - 1) {
 163                                 fprintf(stderr, "-d requires an arg\n");
 164                                 print_usage();
 165                         }
 166                         command = BTRFS_IOC_DEFRAG;
 167                 } else if (strcmp(av[i], "-D") == 0) {
 168                         if (i >= ac - 1) {
 169                                 fprintf(stderr, "-D requires an arg\n");
 170                                 print_usage();
 171                         }
 172                         command = BTRFS_IOC_SNAP_DESTROY;
 173                         name = av[i + 1];
 174                         len = strlen(name);
 175                         pos = strchr(name, '/');
 176                         if (pos) {
 177                                 if (*(pos + 1) == '\0')
 178                                         *(pos) = '\0';
 179                                 else {
 180                                         fprintf(stderr,
 181                                                 "error: / not allowed in names\n");
 182                                         exit(1);
 183                                 }
 184                         }
 185                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 186                                 fprintf(stderr, "-D size too long\n");
 187                                 exit(1);
 188                         }
 189                 } else if (strcmp(av[i], "-A") == 0) {
 190                         if (i >= ac - 1) {
 191                                 fprintf(stderr, "-A requires an arg\n");
 192                                 print_usage();
 193                         }
 194                         command = BTRFS_IOC_SCAN_DEV;
 195                 } else if (strcmp(av[i], "-r") == 0) {
 196                         if (i >= ac - 1) {
 197                                 fprintf(stderr, "-r requires an arg\n");
 198                                 print_usage();
 199                         }
 200                         name = av[i + 1];
 201                         len = strlen(name);
 202                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 203                                 fprintf(stderr, "-r size too long\n");
 204                                 exit(1);
 205                         }
 206                         command = BTRFS_IOC_RESIZE;
 207                 } else if (strcmp(av[i], "-c") == 0) {
 208                         command = BTRFS_IOC_SYNC;
 209                 } else if (strcmp(av[i], "-m") == 0) {
 210                         command = BTRFS_IOC_DEFAULT_SUBVOL;
 211                         if (i == ac - 3) {
 212                                 objectid = (unsigned long long)
 213                                             strtoll(av[i + 1], NULL, 0);
 214                                 if (errno == ERANGE) {
 215                                         fprintf(stderr, "invalid tree id\n");
 216                                         exit(1);
 217                                 }
 218                         }
 219                 }
 220         }
 221         if (command == 0) {
 222                 fprintf(stderr, "no valid commands given\n");
 223                 print_usage();
 224                 exit(1);
 225         }
 226         fname = av[ac - 1];
 227
 228         if (command == BTRFS_IOC_SCAN_DEV) {
 229                 fd = open("/dev/btrfs-control", O_RDWR);
 230                 if (fd < 0) {
 231                         perror("failed to open /dev/btrfs-control");
 232                         exit(1);
 233                 }
 234                 name = fname;
 235          } else {
 236                 fd = open_file_or_dir(fname);
 237          }
 238
 239         if (name)
 240                 strcpy(args.name, name);
 241         else
 242                 args.name[0] = '\0';
 243
 244         if (command == BTRFS_IOC_SNAP_CREATE) {
 245                 args.fd = fd;
 246                 ret = ioctl(snap_fd, command, &args);
 247         } else if (command == BTRFS_IOC_DEFAULT_SUBVOL) {
 248                 printf("objectid is %llu\n", objectid);
 249                 ret = ioctl(fd, command, &objectid);
 250         } else
 251                 ret = ioctl(fd, command, &args);
 252         if (ret < 0) {
 253                 perror("ioctl:");
 254                 exit(1);
 255         }
 256         if (ret == 0) {
 257                 printf("operation complete\n");
 258         } else {
 259                 printf("ioctl failed with error %d\n", ret);
 260         }
 261         printf("%s\n", BTRFS_BUILD_VERSION);
 262         if (ret)
 263                 exit(1);
 264
 265         return 0;
 266 }
 267