src/udev/udev-builtin-btrfs.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2012 Kay Sievers <kay@vrfy.org>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stdlib.h>
  21 #include <fcntl.h>
  22 #include <sys/ioctl.h>
  23
  24 #ifdef HAVE_LINUX_BTRFS_H
  25 #include <linux/btrfs.h>
  26 #endif
  27
  28 #include "missing.h"
  29 #include "udev.h"
  30
  31 static int builtin_btrfs(struct udev_device *dev, int argc, char *argv[], bool test) {
  32         struct btrfs_ioctl_vol_args args = {};
  33         _cleanup_close_ int fd = -1;
  34         int err;
  35
  36         if (argc != 3 || !streq(argv[1], "ready"))
  37                 return EXIT_FAILURE;
  38
  39         fd = open("/dev/btrfs-control", O_RDWR|O_CLOEXEC);
  40         if (fd < 0)
  41                 return EXIT_FAILURE;
  42
  43         strscpy(args.name, sizeof(args.name), argv[2]);
  44         err = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
  45         if (err < 0)
  46                 return EXIT_FAILURE;
  47
  48         udev_builtin_add_property(dev, test, "ID_BTRFS_READY", one_zero(err == 0));
  49         return EXIT_SUCCESS;
  50 }
  51
  52 const struct udev_builtin udev_builtin_btrfs = {
  53         .name = "btrfs",
  54         .cmd = builtin_btrfs,
  55         .help = "btrfs volume management",
  56 };