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diff --git a/src/VBox/Additions/linux/sharedfolders/vbsfmount.h b/src/VBox/Additions/linux/sharedfolders/vbsfmount.h
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+/* $Id: vbsfmount.h $ */
+/** @file
+ * vboxsf - VBox Linux Shared Folders VFS, mount(2) parameter structure.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef GA_INCLUDED_SRC_linux_sharedfolders_vbsfmount_h
+#define GA_INCLUDED_SRC_linux_sharedfolders_vbsfmount_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/* Linux constrains the size of data mount argument to PAGE_SIZE - 1. */
+#define MAX_MNTOPT_STR PAGE_SIZE
+#define MAX_HOST_NAME 256
+#define MAX_NLS_NAME 32
+#define VBSF_DEFAULT_TTL_MS 200
+
+#define VBSF_MOUNT_SIGNATURE_BYTE_0 '\377'
+#define VBSF_MOUNT_SIGNATURE_BYTE_1 '\376'
+#define VBSF_MOUNT_SIGNATURE_BYTE_2 '\375'
+
+/**
+ * VBox Linux Shared Folders VFS caching mode.
+ */
+enum vbsf_cache_mode {
+ /** Use the kernel modules default caching mode (kVbsfCacheMode_Strict). */
+ kVbsfCacheMode_Default = 0,
+ /** No caching, go to the host for everything. This will have some minor
+ * coherency issues for memory mapping with unsynced dirty pages. */
+ kVbsfCacheMode_None,
+ /** No caching, except for files with writable memory mappings.
+ * (Note to future: if we do oplock like stuff, it goes in here.) */
+ kVbsfCacheMode_Strict,
+ /** Use page cache for reads.
+ * This improves guest performance for read intensive jobs, like compiling
+ * building. The flip side is that the guest may not see host modification in a
+ * timely manner and possibly update files with out-of-date cache information,
+ * as there exists no protocol for the host to notify the guest about file
+ * modifications. */
+ kVbsfCacheMode_Read,
+ /** Use page cache for both reads and writes as far as that's possible.
+ * This is good for guest performance, but the price is that the guest possibly
+ * ignoring host changes and the host not seeing guest changes in a timely
+ * manner. */
+ kVbsfCacheMode_ReadWrite,
+ /** End of valid values (exclusive). */
+ kVbsfCacheMode_End,
+ /** Make sure the enum is sizeof(int32_t). */
+ kVbsfCacheMode_32BitHack = 0x7fffffff
+};
+
+/**
+ * VBox Linux Shared Folders VFS mount options.
+ */
+struct vbsf_mount_info_new {
+ /**
+ * The old version of the mount_info struct started with a
+ * char name[MAX_HOST_NAME] field, where name cannot be '\0'.
+ * So the new version of the mount_info struct starts with a
+ * nullchar field which is always 0 so that we can detect and
+ * reject the old structure being passed.
+ */
+ char nullchar;
+ /** Signature */
+ char signature[3];
+ /** Length of the whole structure */
+ int length;
+ /** Share name */
+ char name[MAX_HOST_NAME];
+ /** Name of an I/O charset */
+ char nls_name[MAX_NLS_NAME];
+ /** User ID for all entries, default 0=root */
+ int uid;
+ /** Group ID for all entries, default 0=root */
+ int gid;
+ /** Directory entry and inode time to live in milliseconds.
+ * -1 for kernel default, 0 to disable caching.
+ * @sa vbsf_mount_info_new::msDirCacheTTL, vbsf_mount_info_new::msInodeTTL */
+ int ttl;
+ /** Mode for directories if != -1. */
+ int dmode;
+ /** Mode for regular files if != -1. */
+ int fmode;
+ /** umask applied to directories */
+ int dmask;
+ /** umask applied to regular files */
+ int fmask;
+ /** Mount tag for VBoxService automounter.
+ * @since 6.0.0 */
+ char szTag[32];
+ /** Max pages to read & write at a time.
+ * @since 6.0.6 */
+ uint32_t cMaxIoPages;
+ /** The directory content buffer size. Set to 0 for kernel module default.
+ * Larger value reduces the number of host calls on large directories. */
+ uint32_t cbDirBuf;
+ /** The time to live for directory entries (in milliseconds). @a ttl is used
+ * if negative.
+ * @since 6.0.6 */
+ int32_t msDirCacheTTL;
+ /** The time to live for inode information (in milliseconds). @a ttl is used
+ * if negative.
+ * @since 6.0.6 */
+ int32_t msInodeTTL;
+ /** The cache and coherency mode.
+ * @since 6.0.6 */
+ enum vbsf_cache_mode enmCacheMode;
+};
+#ifdef AssertCompileSize
+AssertCompileSize(struct vbsf_mount_info_new, 2*4 + MAX_HOST_NAME + MAX_NLS_NAME + 7*4 + 32 + 5*4);
+#endif
+
+/** Completes the mount operation by adding the new mount point to mtab if required. */
+int vbsfmount_complete(const char *pszSharedFolder, const char *pszMountPoint,
+ unsigned long fFlags, const char *pszOpts);
+
+#endif /* !GA_INCLUDED_SRC_linux_sharedfolders_vbsfmount_h */