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 "kerncompat.h"
  32 #include "ctree.h"
  33 #include "transaction.h"
  34 #include "utils.h"
  35
  36 #ifdef __CHECKER__
  37 #define BLKGETSIZE64 0
  38 #define BTRFS_IOC_SNAP_CREATE 0
  39 #define BTRFS_VOL_NAME_MAX 255
  40 struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
  41 static inline int ioctl(int fd, int define, void *arg) { return 0; }
  42 #endif
  43
  44 void print_usage(void)
  45 {
  46         printf("usage: btrfsctl [ -s name ] [-d] [-r size] file_or_dir\n");
  47         printf("\t-d filename defragments one file\n");
  48         printf("\t-d directory defragments the entire Btree\n");
  49         printf("\t-s snap_name existing_subvol creates a new snapshot\n");
  50         printf("\t-s snap_name tree_root creates a new subvolume\n");
  51         printf("\t-r [+-]size[gkm] resize the FS\n");
  52         printf("\t-A device scans the device for a Btrfs filesystem\n");
  53         printf("\t-a scans all devices for Btrfs filesystems\n");
  54         printf("\t-c forces a single FS sync\n");
  55         exit(1);
  56 }
  57
  58 int main(int ac, char **av)
  59 {
  60         char *fname;
  61         int fd;
  62         int ret;
  63         struct btrfs_ioctl_vol_args args;
  64         char *name = NULL;
  65         int i;
  66         struct stat st;
  67         DIR *dirstream;
  68         unsigned long command = 0;
  69         int len;
  70
  71         if (ac == 2 && strcmp(av[1], "-a") == 0) {
  72                 fprintf(stderr, "Scanning for Btrfs filesystems\n");
  73                 btrfs_scan_one_dir("/dev", 1);
  74                 exit(0);
  75         }
  76         for (i = 1; i < ac - 1; i++) {
  77                 if (strcmp(av[i], "-s") == 0) {
  78                         if (i + 1 >= ac - 1) {
  79                                 fprintf(stderr, "-s requires an arg");
  80                                 print_usage();
  81                         }
  82                         name = av[i + 1];
  83                         len = strlen(name);
  84                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
  85                                 fprintf(stderr,
  86                                      "snapshot name zero length or too long\n");
  87                                 exit(1);
  88                         }
  89                         if (strchr(name, '/')) {
  90                                 fprintf(stderr,
  91                                         "error: / not allowed in names\n");
  92                                 exit(1);
  93                         }
  94                         command = BTRFS_IOC_SNAP_CREATE;
  95                 } else if (strcmp(av[i], "-d") == 0) {
  96                         if (i >= ac - 1) {
  97                                 fprintf(stderr, "-d requires an arg\n");
  98                                 print_usage();
  99                         }
 100                         command = BTRFS_IOC_DEFRAG;
 101                 } else if (strcmp(av[i], "-A") == 0) {
 102                         if (i >= ac - 1) {
 103                                 fprintf(stderr, "-A requires an arg\n");
 104                                 print_usage();
 105                         }
 106                         command = BTRFS_IOC_SCAN_DEV;
 107                 } else if (strcmp(av[i], "-r") == 0) {
 108                         if (i >= ac - 1) {
 109                                 fprintf(stderr, "-r requires an arg\n");
 110                                 print_usage();
 111                         }
 112                         name = av[i + 1];
 113                         len = strlen(name);
 114                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 115                                 fprintf(stderr, "-r size too long\n");
 116                                 exit(1);
 117                         }
 118                         command = BTRFS_IOC_RESIZE;
 119                 } else if (strcmp(av[i], "-c") == 0) {
 120                         command = BTRFS_IOC_SYNC;
 121                 }
 122         }
 123         if (command == 0) {
 124                 fprintf(stderr, "no valid commands given\n");
 125                 print_usage();
 126                 exit(1);
 127         }
 128         fname = av[ac - 1];
 129         ret = stat(fname, &st);
 130         if (ret < 0) {
 131                 perror("stat:");
 132                 exit(1);
 133         }
 134         if (S_ISDIR(st.st_mode)) {
 135                 dirstream = opendir(fname);
 136                 if (!dirstream) {
 137                         perror("opendir");
 138                         exit(1);
 139                 }
 140                 fd = dirfd(dirstream);
 141         } else if (command == BTRFS_IOC_SCAN_DEV) {
 142                 fd = open("/dev/btrfs-control", O_RDWR);
 143                 name = fname;
 144         } else {
 145                 fd = open(fname, O_RDWR);
 146         }
 147         if (fd < 0) {
 148                 perror("open");
 149                 exit(1);
 150         }
 151         if (name)
 152                 strcpy(args.name, name);
 153         else
 154                 args.name[0] = '\0';
 155         ret = ioctl(fd, command, &args);
 156         if (ret < 0) {
 157                 perror("ioctl:");
 158                 exit(1);
 159         }
 160         printf("ioctl returns %d\n", ret);
 161         return 0;
 162 }
 163