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