Commits

Kay Sievers  committed 974eb7c

udev: add btrfs support

All "btrfs" file systems will be registered with the kernel when they
show up.

  • Participants
  • Parent commits 8d89ba6

Comments (0)

Files changed (5)

 	rules/60-persistent-input.rules \
 	rules/60-persistent-alsa.rules \
 	rules/60-persistent-storage.rules \
+	rules/64-btrfs.rules \
 	rules/75-net-description.rules \
 	rules/75-tty-description.rules \
 	rules/78-sound-card.rules \
 	src/udev-ctrl.c \
 	src/udev-builtin.c \
 	src/udev-builtin-blkid.c \
+	src/udev-builtin-btrfs.c \
 	src/udev-builtin-firmware.c \
 	src/udev-builtin-hwdb.c \
 	src/udev-builtin-input_id.c \

File rules/64-btrfs.rules

+# do not edit this file, it will be overwritten on update
+
+SUBSYSTEM!="block", GOTO="btrfs_end"
+ACTION=="remove", GOTO="btrfs_end"
+ENV{ID_FS_TYPE}!="btrfs", GOTO="btrfs_end"
+
+# let the kernel know about this btrfs filesystem, and check if it is complete
+IMPORT{builtin}="btrfs ready $devnode"
+
+LABEL="btrfs_end"

File src/udev-builtin-btrfs.c

+/*
+ * btrfs - volume management
+ *
+ * Copyright (C) 2012 Kay Sievers <kay@vrfy.org>
+ *
+ * This library 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.
+ */
+
+#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;
+        int fd;
+        int err;
+
+        if (argc != 3 || strcmp(argv[1], "ready"))
+                return EXIT_FAILURE;
+
+        fd = open("/dev/btrfs-control", O_RDWR);
+        if (fd < 0)
+                return EXIT_FAILURE;
+
+        util_strscpy(args.name, sizeof(args.name), argv[2]);
+        err = ioctl(fd, BTRFS_IOC_DEVICES_READY, &args);
+        close(fd);
+        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",
+};

File src/udev-builtin.c

 
 static const struct udev_builtin *builtins[] = {
         [UDEV_BUILTIN_BLKID] = &udev_builtin_blkid,
+        [UDEV_BUILTIN_BTRFS] = &udev_builtin_btrfs,
         [UDEV_BUILTIN_FIRMWARE] = &udev_builtin_firmware,
         [UDEV_BUILTIN_INPUT_ID] = &udev_builtin_input_id,
         [UDEV_BUILTIN_KMOD] = &udev_builtin_kmod,
 /* built-in commands */
 enum udev_builtin_cmd {
         UDEV_BUILTIN_BLKID,
+        UDEV_BUILTIN_BTRFS,
         UDEV_BUILTIN_FIRMWARE,
         UDEV_BUILTIN_INPUT_ID,
         UDEV_BUILTIN_KMOD,
         bool run_once;
 };
 extern const struct udev_builtin udev_builtin_blkid;
+extern const struct udev_builtin udev_builtin_btrfs;
 extern const struct udev_builtin udev_builtin_firmware;
 extern const struct udev_builtin udev_builtin_input_id;
 extern const struct udev_builtin udev_builtin_kmod;