src/udev/udev-builtin-btrfs.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2012 Kay Sievers <kay@vrfy.org>
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include <fcntl.h>
  22 #include <stdlib.h>
  23 #include <sys/ioctl.h>
  24
  25 #if HAVE_LINUX_BTRFS_H
  26 #include <linux/btrfs.h>
  27 #endif
  28
  29 #include "fd-util.h"
  30 #include "missing.h"
  31 #include "string-util.h"
  32 #include "udev.h"
  33
  34 static int builtin_btrfs(struct udev_device *dev, int argc, char *argv[], bool test) {
  35         struct btrfs_ioctl_vol_args args = {};
  36         _cleanup_close_ int fd = -1;
  37         int err;
  38
  39         if (argc != 3 || !streq(argv[1], "ready"))
  40                 return EXIT_FAILURE;
  41
  42         fd = open("/dev/btrfs-control", O_RDWR|O_CLOEXEC);
  43         if (fd < 0)
  44                 return EXIT_FAILURE;
  45
  46         strscpy(args.name, sizeof(args.name), argv[2]);
  47         err = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
  48         if (err < 0)
  49                 return EXIT_FAILURE;
  50
  51         udev_builtin_add_property(dev, test, "ID_BTRFS_READY", one_zero(err == 0));
  52         return EXIT_SUCCESS;
  53 }
  54
  55 const struct udev_builtin udev_builtin_btrfs = {
  56         .name = "btrfs",
  57         .cmd = builtin_btrfs,
  58         .help = "btrfs volume management",
  59 };