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 #include "version.h"
  36
  37 #ifdef __CHECKER__
  38 #define BLKGETSIZE64 0
  39 #define BTRFS_IOC_SNAP_CREATE 0
  40 #define BTRFS_VOL_NAME_MAX 255
  41 struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
  42 static inline int ioctl(int fd, int define, void *arg) { return 0; }
  43 #endif
  44
  45 void print_usage(void)
  46 {
  47         printf("usage: btrfsctl [ -s name ] [-d] [-r size] file_or_dir\n");
  48         printf("\t-d filename defragments one file\n");
  49         printf("\t-d directory defragments the entire Btree\n");
  50         printf("\t-s snap_name existing_subvol creates a new snapshot\n");
  51         printf("\t-s snap_name tree_root creates a new subvolume\n");
  52         printf("\t-r [+-]size[gkm] resize the FS\n");
  53         printf("\t-A device scans the device for a Btrfs filesystem\n");
  54         printf("\t-a scans all devices for Btrfs filesystems\n");
  55         printf("\t-c forces a single FS sync\n");
  56         printf("%s\n", BTRFS_BUILD_VERSION);
  57         exit(1);
  58 }
  59
  60 int main(int ac, char **av)
  61 {
  62         char *fname;
  63         int fd;
  64         int ret;
  65         struct btrfs_ioctl_vol_args args;
  66         char *name = NULL;
  67         int i;
  68         struct stat st;
  69         DIR *dirstream;
  70         unsigned long command = 0;
  71         int len;
  72
  73         if (ac == 2 && strcmp(av[1], "-a") == 0) {
  74                 fprintf(stderr, "Scanning for Btrfs filesystems\n");
  75                 btrfs_scan_one_dir("/dev", 1);
  76                 exit(0);
  77         }
  78         for (i = 1; i < ac - 1; i++) {
  79                 if (strcmp(av[i], "-s") == 0) {
  80                         if (i + 1 >= ac - 1) {
  81                                 fprintf(stderr, "-s requires an arg");
  82                                 print_usage();
  83                         }
  84                         name = av[i + 1];
  85                         len = strlen(name);
  86                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
  87                                 fprintf(stderr,
  88                                      "snapshot name zero length or too long\n");
  89                                 exit(1);
  90                         }
  91                         if (strchr(name, '/')) {
  92                                 fprintf(stderr,
  93                                         "error: / not allowed in names\n");
  94                                 exit(1);
  95                         }
  96                         command = BTRFS_IOC_SNAP_CREATE;
  97                 } else if (strcmp(av[i], "-d") == 0) {
  98                         if (i >= ac - 1) {
  99                                 fprintf(stderr, "-d requires an arg\n");
 100                                 print_usage();
 101                         }
 102                         command = BTRFS_IOC_DEFRAG;
 103                 } else if (strcmp(av[i], "-A") == 0) {
 104                         if (i >= ac - 1) {
 105                                 fprintf(stderr, "-A requires an arg\n");
 106                                 print_usage();
 107                         }
 108                         command = BTRFS_IOC_SCAN_DEV;
 109                 } else if (strcmp(av[i], "-r") == 0) {
 110                         if (i >= ac - 1) {
 111                                 fprintf(stderr, "-r requires an arg\n");
 112                                 print_usage();
 113                         }
 114                         name = av[i + 1];
 115                         len = strlen(name);
 116                         if (len == 0 || len >= BTRFS_VOL_NAME_MAX) {
 117                                 fprintf(stderr, "-r size too long\n");
 118                                 exit(1);
 119                         }
 120                         command = BTRFS_IOC_RESIZE;
 121                 } else if (strcmp(av[i], "-c") == 0) {
 122                         command = BTRFS_IOC_SYNC;
 123                 }
 124         }
 125         if (command == 0) {
 126                 fprintf(stderr, "no valid commands given\n");
 127                 print_usage();
 128                 exit(1);
 129         }
 130         fname = av[ac - 1];
 131         ret = stat(fname, &st);
 132         if (ret < 0) {
 133                 perror("stat:");
 134                 exit(1);
 135         }
 136         if (S_ISDIR(st.st_mode)) {
 137                 dirstream = opendir(fname);
 138                 if (!dirstream) {
 139                         perror("opendir");
 140                         exit(1);
 141                 }
 142                 fd = dirfd(dirstream);
 143         } else if (command == BTRFS_IOC_SCAN_DEV) {
 144                 fd = open("/dev/btrfs-control", O_RDWR);
 145                 name = fname;
 146         } else {
 147                 fd = open(fname, O_RDWR);
 148         }
 149         if (fd < 0) {
 150                 perror("open");
 151                 exit(1);
 152         }
 153         if (name)
 154                 strcpy(args.name, name);
 155         else
 156                 args.name[0] = '\0';
 157         ret = ioctl(fd, command, &args);
 158         if (ret < 0) {
 159                 perror("ioctl:");
 160                 exit(1);
 161         }
 162         if (ret == 0) {
 163                 printf("operation complete\n");
 164         } else {
 165                 printf("ioctl failed with error %d\n", ret);
 166         }
 167         printf("%s\n", BTRFS_BUILD_VERSION);
 168         if (ret)
 169                 exit(0);
 170         else
 171                 exit(1);
 172 }
 173