/*** 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", };