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