src/udev/udev-builtin-btrfs.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <fcntl.h>
   4 #include <stdlib.h>
   5 #include <sys/ioctl.h>
   6
   7 #if HAVE_LINUX_BTRFS_H
   8 #include <linux/btrfs.h>
   9 #endif
  10
  11 #include "device-util.h"
  12 #include "fd-util.h"
  13 #include "missing.h"
  14 #include "string-util.h"
  15 #include "strxcpyx.h"
  16 #include "udev-builtin.h"
  17 #include "util.h"
  18
  19 static int builtin_btrfs(sd_device *dev, int argc, char *argv[], bool test) {
  20         struct btrfs_ioctl_vol_args args = {};
  21         _cleanup_close_ int fd = -1;
  22         int r;
  23
  24         if (argc != 3 || !streq(argv[1], "ready"))
  25                 return log_device_error_errno(dev, EINVAL, "Invalid arguments");
  26
  27         fd = open("/dev/btrfs-control", O_RDWR|O_CLOEXEC);
  28         if (fd < 0)
  29                 return log_device_debug_errno(dev, errno, "Failed to open /dev/btrfs-control: %m");
  30
  31         strscpy(args.name, sizeof(args.name), argv[2]);
  32         r = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
  33         if (r < 0)
  34                 return log_device_debug_errno(dev, errno, "Failed to call BTRFS_IOC_DEVICES_READY: %m");
  35
  36         udev_builtin_add_property(dev, test, "ID_BTRFS_READY", one_zero(r == 0));
  37         return 0;
  38 }
  39
  40 const struct udev_builtin udev_builtin_btrfs = {
  41         .name = "btrfs",
  42         .cmd = builtin_btrfs,
  43         .help = "btrfs volume management",
  44 };