1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <linux/btrfs.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include "device-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "string-util.h"
#include "strxcpyx.h"
#include "udev-builtin.h"
static int builtin_btrfs(UdevEvent *event, int argc, char *argv[]) {
sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
struct btrfs_ioctl_vol_args args = {};
_cleanup_close_ int fd = -EBADF;
int r;
if (argc != 3 || !streq(argv[1], "ready"))
return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), "Invalid arguments");
fd = open("/dev/btrfs-control", O_RDWR|O_CLOEXEC|O_NOCTTY);
if (fd < 0) {
if (ERRNO_IS_DEVICE_ABSENT(errno)) {
/* Driver not installed? Then we aren't ready. This is useful in initrds that lack
* btrfs.ko. After the host transition (where btrfs.ko will hopefully become
* available) the device can be retriggered and will then be considered ready. */
udev_builtin_add_property(dev, event->event_mode, "ID_BTRFS_READY", "0");
return 0;
}
return log_device_debug_errno(dev, errno, "Failed to open /dev/btrfs-control: %m");
}
strscpy(args.name, sizeof(args.name), argv[2]);
r = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
if (r < 0)
return log_device_debug_errno(dev, errno, "Failed to call BTRFS_IOC_DEVICES_READY: %m");
udev_builtin_add_property(dev, event->event_mode, "ID_BTRFS_READY", one_zero(r == 0));
return 0;
}
const UdevBuiltin udev_builtin_btrfs = {
.name = "btrfs",
.cmd = builtin_btrfs,
.help = "btrfs volume management",
};
|
