51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <fcntl.h>
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#include <linux/btrfs.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include "device-util.h"
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#include "errno-util.h"
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#include "fd-util.h"
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#include "string-util.h"
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#include "strxcpyx.h"
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#include "udev-builtin.h"
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static int builtin_btrfs(UdevEvent *event, int argc, char *argv[], bool test) {
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sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
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struct btrfs_ioctl_vol_args args = {};
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_cleanup_close_ int fd = -EBADF;
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int r;
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if (argc != 3 || !streq(argv[1], "ready"))
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return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), "Invalid arguments");
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fd = open("/dev/btrfs-control", O_RDWR|O_CLOEXEC|O_NOCTTY);
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if (fd < 0) {
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if (ERRNO_IS_DEVICE_ABSENT(errno)) {
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/* Driver not installed? Then we aren't ready. This is useful in initrds that lack
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* btrfs.ko. After the host transition (where btrfs.ko will hopefully become
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* available) the device can be retriggered and will then be considered ready. */
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udev_builtin_add_property(dev, test, "ID_BTRFS_READY", "0");
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return 0;
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}
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return log_device_debug_errno(dev, errno, "Failed to open /dev/btrfs-control: %m");
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}
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strscpy(args.name, sizeof(args.name), argv[2]);
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r = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
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if (r < 0)
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return log_device_debug_errno(dev, errno, "Failed to call BTRFS_IOC_DEVICES_READY: %m");
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udev_builtin_add_property(dev, test, "ID_BTRFS_READY", one_zero(r == 0));
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return 0;
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}
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const UdevBuiltin udev_builtin_btrfs = {
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.name = "btrfs",
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.cmd = builtin_btrfs,
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.help = "btrfs volume management",
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};
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