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 *fullpath;
 107         u64 objectid = 0;
 108
 109         if (ac == 2 && strcmp(av[1], "-a") == 0) {
 110                 fprintf(stderr, "Scanning for Btrfs filesystems\n");
 111                 btrfs_scan_one_dir("/dev", 1);
 112                 exit(0);
 113         }
 114         for (i = 1; i < ac; i++) {
 115                 if (strcmp(av[i], "-s") == 0) {
 116                         if (i + 1 >= ac - 1) {
 117                                 fprintf(stderr, "-s requires an arg");
 118                                 print_usage();
 119                         }
 120                         fullpath = av[i + 1];
 121
 122                         snap_location = strdup(fullpath);
 123                         snap_location = dirname(snap_location);
 124
 125                         snap_fd = open_file_or_dir(snap_location);
 126
 127                         name = strdup(fullpath);
 128                         name = basename(name);
 129                         len = strlen(name);
 130
 131                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 132                                 fprintf(stderr,
 133                                      "snapshot name zero length or too long\n");
 134                                 exit(1);
 135                         }
 136                         if (strchr(name, '/')) {
 137                                 fprintf(stderr,
 138                                         "error: / not allowed in names\n");
 139                                 exit(1);
 140                         }
 141                         command = BTRFS_IOC_SNAP_CREATE;
 142                 } else if (strcmp(av[i], "-S") == 0) {
 143                         if (i + 1 >= ac - 1) {
 144                                 fprintf(stderr, "-S requires an arg");
 145                                 print_usage();
 146                         }
 147                         name = av[i + 1];
 148                         len = strlen(name);
 149                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 150                                 fprintf(stderr,
 151                                      "snapshot name zero length or too long\n");
 152                                 exit(1);
 153                         }
 154                         if (strchr(name, '/')) {
 155                                 fprintf(stderr,
 156                                         "error: / not allowed in names\n");
 157                                 exit(1);
 158                         }
 159                         command = BTRFS_IOC_SUBVOL_CREATE;
 160                 } else if (strcmp(av[i], "-d") == 0) {
 161                         if (i >= ac - 1) {
 162                                 fprintf(stderr, "-d requires an arg\n");
 163                                 print_usage();
 164                         }
 165                         command = BTRFS_IOC_DEFRAG;
 166                 } else if (strcmp(av[i], "-D") == 0) {
 167                         if (i >= ac - 1) {
 168                                 fprintf(stderr, "-D requires an arg\n");
 169                                 print_usage();
 170                         }
 171                         command = BTRFS_IOC_SNAP_DESTROY;
 172                         name = av[i + 1];
 173                         len = strlen(name);
 174                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 175                                 fprintf(stderr, "-D size too long\n");
 176                                 exit(1);
 177                         }
 178                 } else if (strcmp(av[i], "-A") == 0) {
 179                         if (i >= ac - 1) {
 180                                 fprintf(stderr, "-A requires an arg\n");
 181                                 print_usage();
 182                         }
 183                         command = BTRFS_IOC_SCAN_DEV;
 184                 } else if (strcmp(av[i], "-r") == 0) {
 185                         if (i >= ac - 1) {
 186                                 fprintf(stderr, "-r requires an arg\n");
 187                                 print_usage();
 188                         }
 189                         name = av[i + 1];
 190                         len = strlen(name);
 191                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 192                                 fprintf(stderr, "-r size too long\n");
 193                                 exit(1);
 194                         }
 195                         command = BTRFS_IOC_RESIZE;
 196                 } else if (strcmp(av[i], "-c") == 0) {
 197                         command = BTRFS_IOC_SYNC;
 198                 } else if (strcmp(av[i], "-m") == 0) {
 199                         command = BTRFS_IOC_DEFAULT_SUBVOL;
 200                         if (i == ac - 3) {
 201                                 objectid = (unsigned long long)
 202                                             strtoll(av[i + 1], NULL, 0);
 203                                 if (errno == ERANGE) {
 204                                         fprintf(stderr, "invalid tree id\n");
 205                                         exit(1);
 206                                 }
 207                         }
 208                 }
 209         }
 210         if (command == 0) {
 211                 fprintf(stderr, "no valid commands given\n");
 212                 print_usage();
 213                 exit(1);
 214         }
 215         fname = av[ac - 1];
 216
 217         if (command == BTRFS_IOC_SCAN_DEV) {
 218                 fd = open("/dev/btrfs-control", O_RDWR);
 219                 if (fd < 0) {
 220                         perror("failed to open /dev/btrfs-control");
 221                         exit(1);
 222                 }
 223                 name = fname;
 224          } else {
 225                 fd = open_file_or_dir(fname);
 226          }
 227
 228         if (name)
 229                 strcpy(args.name, name);
 230         else
 231                 args.name[0] = '\0';
 232
 233         if (command == BTRFS_IOC_SNAP_CREATE) {
 234                 args.fd = fd;
 235                 ret = ioctl(snap_fd, command, &args);
 236         } else if (command == BTRFS_IOC_DEFAULT_SUBVOL) {
 237                 printf("objectid is %llu\n", objectid);
 238                 ret = ioctl(fd, command, &objectid);
 239         } else
 240                 ret = ioctl(fd, command, &args);
 241         if (ret < 0) {
 242                 perror("ioctl:");
 243                 exit(1);
 244         }
 245         if (ret == 0) {
 246                 printf("operation complete\n");
 247         } else {
 248                 printf("ioctl failed with error %d\n", ret);
 249         }
 250         printf("%s\n", BTRFS_BUILD_VERSION);
 251         if (ret)
 252                 exit(0);
 253         else
 254                 exit(1);
 255 }
 256