udev-builtin-btrfs.c revision 9ec6e95b046de71c0198cb9d17acc5462dc76c74
/***
This file is part of systemd.
Copyright 2012 Kay Sievers <kay@vrfy.org>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include "udev.h"
#define BTRFS_PATH_NAME_MAX 4087
struct btrfs_ioctl_vol_args {
int64_t fd;
char name[BTRFS_PATH_NAME_MAX + 1];
};
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_IOC_DEVICES_READY _IOR(BTRFS_IOCTL_MAGIC, 39, struct btrfs_ioctl_vol_args)
static int builtin_btrfs(struct udev_device *dev, int argc, char *argv[], bool test) {
struct btrfs_ioctl_vol_args args;
_cleanup_close_ int fd = -1;
int err;
if (argc != 3 || !streq(argv[1], "ready"))
return EXIT_FAILURE;
fd = open("/dev/btrfs-control", O_RDWR|O_CLOEXEC);
if (fd < 0)
return EXIT_FAILURE;
strscpy(args.name, sizeof(args.name), argv[2]);
err = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
if (err < 0)
return EXIT_FAILURE;
udev_builtin_add_property(dev, test, "ID_BTRFS_READY", err == 0 ? "1" : "0");
return EXIT_SUCCESS;
}
const struct udev_builtin udev_builtin_btrfs = {
.name = "btrfs",
.cmd = builtin_btrfs,
.help = "btrfs volume management",
};