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From: Hans de Goede <hdegoede@redhat.com>
To: Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Michael Thayer <michael.thayer@oracle.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Hans de Goede <hdegoede@redhat.com>,
	Larry Finger <Larry.Finger@lwfinger.net>,
	Christoph Hellwig <hch@infradead.org>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH v2] fs: Add VirtualBox guest shared folder (vboxsf) support
Date: Mon, 15 Jan 2018 18:51:16 +0100	[thread overview]
Message-ID: <20180115175116.4130-2-hdegoede@redhat.com> (raw)
In-Reply-To: <20180115175116.4130-1-hdegoede@redhat.com>

VirtualBox hosts can share folders with guests, this commit adds a
VFS driver implementing the Linux-guest side of this, allowing folders
exported by the host to be mounted under Linux.

This driver depends on the guest <-> host IPC functions exported by
the vboxguest driver.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 fs/Kconfig                     |   1 +
 fs/Makefile                    |   1 +
 fs/vboxsf/Kconfig              |   9 +
 fs/vboxsf/Makefile             |   3 +
 fs/vboxsf/dir.c                | 648 +++++++++++++++++++++++++++++
 fs/vboxsf/file.c               | 416 +++++++++++++++++++
 fs/vboxsf/shfl_hostintf.h      | 919 +++++++++++++++++++++++++++++++++++++++++
 fs/vboxsf/super.c              | 430 +++++++++++++++++++
 fs/vboxsf/utils.c              | 589 ++++++++++++++++++++++++++
 fs/vboxsf/vboxsf_wrappers.c    | 365 ++++++++++++++++
 fs/vboxsf/vboxsf_wrappers.h    |  46 +++
 fs/vboxsf/vfsmod.h             | 104 +++++
 include/uapi/linux/vbsfmount.h |  62 +++
 13 files changed, 3593 insertions(+)
 create mode 100644 fs/vboxsf/Kconfig
 create mode 100644 fs/vboxsf/Makefile
 create mode 100644 fs/vboxsf/dir.c
 create mode 100644 fs/vboxsf/file.c
 create mode 100644 fs/vboxsf/shfl_hostintf.h
 create mode 100644 fs/vboxsf/super.c
 create mode 100644 fs/vboxsf/utils.c
 create mode 100644 fs/vboxsf/vboxsf_wrappers.c
 create mode 100644 fs/vboxsf/vboxsf_wrappers.h
 create mode 100644 fs/vboxsf/vfsmod.h
 create mode 100644 include/uapi/linux/vbsfmount.h

diff --git a/fs/Kconfig b/fs/Kconfig
index 7aee6d699fd6..7f80ad1cf591 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -248,6 +248,7 @@ source "fs/pstore/Kconfig"
 source "fs/sysv/Kconfig"
 source "fs/ufs/Kconfig"
 source "fs/exofs/Kconfig"
+source "fs/vboxsf/Kconfig"
 
 endif # MISC_FILESYSTEMS
 
diff --git a/fs/Makefile b/fs/Makefile
index ef772f1eaff8..3057830f112a 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -129,3 +129,4 @@ obj-y				+= exofs/ # Multiple modules
 obj-$(CONFIG_CEPH_FS)		+= ceph/
 obj-$(CONFIG_PSTORE)		+= pstore/
 obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
+obj-$(CONFIG_VBOXSF_FS)		+= vboxsf/
diff --git a/fs/vboxsf/Kconfig b/fs/vboxsf/Kconfig
new file mode 100644
index 000000000000..620e2232969c
--- /dev/null
+++ b/fs/vboxsf/Kconfig
@@ -0,0 +1,9 @@
+config VBOXSF_FS
+	tristate "VirtualBox guest shared folder (vboxsf) support"
+	depends on VBOXGUEST
+	help
+	  VirtualBox hosts can share folders with guests, this driver
+	  implements the Linux-guest side of this allowing folders exported
+	  by the host to be mounted under Linux.
+
+	  If you want to use shared folders in VirtualBox guests, answer Y or M.
diff --git a/fs/vboxsf/Makefile b/fs/vboxsf/Makefile
new file mode 100644
index 000000000000..fcbd488f9eec
--- /dev/null
+++ b/fs/vboxsf/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_VBOXSF_FS) += vboxsf.o
+
+vboxsf-objs := dir.o file.o utils.o vboxsf_wrappers.o super.o
diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c
new file mode 100644
index 000000000000..7650f92041f7
--- /dev/null
+++ b/fs/vboxsf/dir.c
@@ -0,0 +1,648 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VirtualBox Guest Shared Folders support: Directory inode and file operations
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/namei.h>
+#include <linux/vbox_utils.h>
+#include "vfsmod.h"
+
+/**
+ * Open a directory. Read the complete content into a buffer.
+ * Return: 0 or negative errno value.
+ * @inode	inode
+ * @file	file
+ */
+static int sf_dir_open(struct inode *inode, struct file *file)
+{
+	int err;
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_dir_info *sf_d;
+	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+	struct shfl_createparms params = {};
+
+	if (file->private_data)
+		return 0;
+
+	sf_d = sf_dir_info_alloc();
+	if (!sf_d)
+		return -ENOMEM;
+
+	params.handle = SHFL_HANDLE_NIL;
+	params.create_flags = 0
+	    | SHFL_CF_DIRECTORY
+	    | SHFL_CF_ACT_OPEN_IF_EXISTS
+	    | SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
+
+	err = vboxsf_create(sf_g->root, sf_i->path, &params);
+	if (err == 0) {
+		if (params.result == SHFL_FILE_EXISTS) {
+			err = sf_dir_read_all(sf_g, sf_i, sf_d, params.handle);
+			if (!err)
+				file->private_data = sf_d;
+		} else
+			err = -ENOENT;
+
+		vboxsf_close(sf_g->root, params.handle);
+	}
+
+	if (err)
+		sf_dir_info_free(sf_d);
+
+	return err;
+}
+
+/**
+ * This is called when reference count of [file] goes to zero. Notify
+ * the host that it can free whatever is associated with this directory
+ * and deallocate our own internal buffers
+ * Return: 0 or negative errno value.
+ * @inode	inode
+ * @file	file
+ */
+static int sf_dir_release(struct inode *inode, struct file *file)
+{
+	if (file->private_data)
+		sf_dir_info_free(file->private_data);
+
+	return 0;
+}
+
+/**
+ * Translate RTFMODE into DT_xxx (in conjunction to rtDirType())
+ * Return: d_type
+ * @mode	file mode
+ */
+static int sf_get_d_type(u32 mode)
+{
+	int d_type;
+
+	switch (mode & SHFL_TYPE_MASK) {
+	case SHFL_TYPE_FIFO:
+		d_type = DT_FIFO;
+		break;
+	case SHFL_TYPE_DEV_CHAR:
+		d_type = DT_CHR;
+		break;
+	case SHFL_TYPE_DIRECTORY:
+		d_type = DT_DIR;
+		break;
+	case SHFL_TYPE_DEV_BLOCK:
+		d_type = DT_BLK;
+		break;
+	case SHFL_TYPE_FILE:
+		d_type = DT_REG;
+		break;
+	case SHFL_TYPE_SYMLINK:
+		d_type = DT_LNK;
+		break;
+	case SHFL_TYPE_SOCKET:
+		d_type = DT_SOCK;
+		break;
+	case SHFL_TYPE_WHITEOUT:
+		d_type = DT_WHT;
+		break;
+	default:
+		d_type = DT_UNKNOWN;
+		break;
+	}
+	return d_type;
+}
+
+/**
+ * Extract element ([dir]->f_pos) from the directory [dir] into [d_name].
+ * Return: 0 or negative errno value.
+ * @dir		Directory to get element at f_pos from
+ * @d_name	Buffer in which to return element name
+ * @d_type	Buffer in which to return element file-type
+ */
+static int sf_getdent(struct file *dir, char d_name[NAME_MAX], int *d_type)
+{
+	loff_t cur;
+	struct sf_glob_info *sf_g;
+	struct sf_dir_info *sf_d;
+	struct sf_inode_info *sf_i;
+	struct inode *inode;
+	struct list_head *pos, *list;
+
+	inode = GET_F_DENTRY(dir)->d_inode;
+	sf_i = GET_INODE_INFO(inode);
+	sf_g = GET_GLOB_INFO(inode->i_sb);
+	sf_d = dir->private_data;
+
+	if (sf_i->force_reread) {
+		int err;
+		struct shfl_createparms params = {};
+
+		params.handle = SHFL_HANDLE_NIL;
+		params.create_flags = 0
+		    | SHFL_CF_DIRECTORY
+		    | SHFL_CF_ACT_OPEN_IF_EXISTS
+		    | SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
+
+		err = vboxsf_create(sf_g->root, sf_i->path, &params);
+		if (err)
+			return err;
+
+		if (params.result != SHFL_FILE_EXISTS) {
+			sf_dir_info_free(sf_d);
+			return -ENOENT;
+		}
+
+		sf_dir_info_empty(sf_d);
+		err = sf_dir_read_all(sf_g, sf_i, sf_d, params.handle);
+		vboxsf_close(sf_g->root, params.handle);
+		if (err)
+			return err;
+
+		sf_i->force_reread = 0;
+	}
+
+	cur = 0;
+	list = &sf_d->info_list;
+	list_for_each(pos, list) {
+		struct sf_dir_buf *b;
+		struct shfl_dirinfo *info;
+		loff_t i;
+
+		b = list_entry(pos, struct sf_dir_buf, head);
+		if (dir->f_pos >= cur + b->entries) {
+			cur += b->entries;
+			continue;
+		}
+
+		for (i = 0, info = b->buf; i < dir->f_pos - cur; ++i) {
+			size_t size;
+
+			size = offsetof(struct shfl_dirinfo, name.string) +
+			       info->name.size;
+			info = (struct shfl_dirinfo *)((uintptr_t) info + size);
+		}
+
+		*d_type = sf_get_d_type(info->info.attr.mode);
+
+		return sf_nlscpy(sf_g, d_name, NAME_MAX,
+				 info->name.string.utf8, info->name.length);
+	}
+
+	return 1;
+}
+
+/**
+ * This is called when vfs wants to populate internal buffers with
+ * directory [dir]s contents. [opaque] is an argument to the
+ * [filldir]. [filldir] magically modifies it's argument - [opaque]
+ * and takes following additional arguments (which i in turn get from
+ * the host via sf_getdent):
+ *
+ * name : name of the entry (i must also supply it's length huh?)
+ * type : type of the entry (FILE | DIR | etc) (i ellect to use DT_UNKNOWN)
+ * pos : position/index of the entry
+ * ino : inode number of the entry (i fake those)
+ *
+ * [dir] contains:
+ * f_pos : cursor into the directory listing
+ * private_data : mean of communication with the host side
+ *
+ * Extract elements from the directory listing (incrementing f_pos
+ * along the way) and feed them to [filldir] until:
+ *
+ * a. there are no more entries (i.e. sf_getdent set done to 1)
+ * b. failure to compute fake inode number
+ * c. filldir returns an error (see comment on that)
+ * Return: 0 or negative errno value.
+ * @dir		Directory to read
+ * @ctx		Directory context in which to store read elements
+ */
+static int sf_dir_iterate(struct file *dir, struct dir_context *ctx)
+{
+	for (;;) {
+		int err;
+		ino_t fake_ino;
+		loff_t sanity;
+		char d_name[NAME_MAX];
+		int d_type = DT_UNKNOWN;
+
+		err = sf_getdent(dir, d_name, &d_type);
+		switch (err) {
+		case 1:
+			return 0;
+
+		case 0:
+			break;
+
+		case -1:
+		default:
+			/* skip erroneous entry and proceed */
+			dir->f_pos += 1;
+			ctx->pos += 1;
+			continue;
+		}
+
+		/* d_name now contains a valid entry name */
+		sanity = ctx->pos + 0xbeef;
+		fake_ino = sanity;
+		/*
+		 * On 32 bit systems pos is 64 signed, while ino is 32 bit
+		 * unsigned so fake_ino may overflow, check for this.
+		 */
+		if (sanity - fake_ino) {
+			vbg_err("vboxsf: can not compute ino\n");
+			return -EINVAL;
+		}
+		if (!dir_emit(ctx, d_name, strlen(d_name), fake_ino, d_type))
+			return 0;
+
+		dir->f_pos += 1;
+		ctx->pos += 1;
+	}
+}
+
+const struct file_operations sf_dir_fops = {
+	.open = sf_dir_open,
+	.iterate = sf_dir_iterate,
+	.release = sf_dir_release,
+	.read = generic_read_dir,
+	.llseek = generic_file_llseek,
+};
+
+/*
+ * This is called during name resolution/lookup to check if the [dentry] in the
+ * cache is still valid. the job is handled by [sf_inode_revalidate].
+ */
+static int sf_dentry_revalidate(struct dentry *dentry, unsigned int flags)
+{
+	if (flags & LOOKUP_RCU)
+		return -ECHILD;
+
+	if (sf_inode_revalidate(dentry))
+		return 0;
+
+	return 1;
+}
+
+static const struct dentry_operations sf_dentry_ops = {
+	.d_revalidate = sf_dentry_revalidate
+};
+
+/* iops */
+
+/**
+ * This is called when vfs failed to locate dentry in the cache. The
+ * job of this function is to allocate inode and link it to dentry.
+ * [dentry] contains the name to be looked in the [parent] directory.
+ * Failure to locate the name is not a "hard" error, in this case NULL
+ * inode is added to [dentry] and vfs should proceed trying to create
+ * the entry via other means. NULL(or "positive" pointer) ought to be
+ * returned in case of success and "negative" pointer on error
+ * Return: NULL on success, ERR_PTR on failure.
+ * @parent	inode of the dentry parent-directory
+ * @dentry	dentry to populate
+ * @flags	flags
+ */
+static struct dentry *sf_lookup(struct inode *parent, struct dentry *dentry,
+				unsigned int flags)
+{
+	struct shfl_fsobjinfo fsinfo;
+	struct sf_inode_info *sf_i;
+	struct sf_glob_info *sf_g;
+	struct shfl_string *path;
+	struct inode *inode;
+	ino_t ino;
+	int err;
+
+	sf_g = GET_GLOB_INFO(parent->i_sb);
+	sf_i = GET_INODE_INFO(parent);
+
+	err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
+	if (err)
+		return ERR_PTR(err);
+
+	err = sf_stat(__func__, sf_g, path, &fsinfo, 1);
+	if (err) {
+		kfree(path);
+		if (err != -ENOENT)
+			return ERR_PTR(err);
+		/*
+		 * -ENOENT: add NULL inode to dentry so it later can
+		 * be created via call to create/mkdir/open
+		 */
+		inode = NULL;
+	} else {
+		ino = iunique(parent->i_sb, 1);
+		inode = iget_locked(parent->i_sb, ino);
+		if (!inode) {
+			kfree(path);
+			return ERR_PTR(-ENOMEM);
+		}
+
+		GET_INODE_INFO(inode)->path = path;
+		sf_init_inode(sf_g, inode, &fsinfo);
+
+		unlock_new_inode(inode);
+	}
+
+	dentry->d_time = jiffies;
+	d_set_d_op(dentry, &sf_dentry_ops);
+	d_add(dentry, inode);
+	return NULL;
+}
+
+/**
+ * This should allocate memory for sf_inode_info, compute a unique inode
+ * number, get an inode from vfs, initialize inode info, instantiate
+ * dentry.
+ * Return: 0 or negative errno value.
+ * @parent	inode entry of the directory
+ * @dentry	directory cache entry
+ * @path	path name
+ * @info	file information
+ * @handle	handle
+ */
+static int sf_instantiate(struct inode *parent, struct dentry *dentry,
+			  struct shfl_string *path, struct shfl_fsobjinfo *info,
+			  u64 handle)
+{
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+	struct sf_inode_info *sf_i;
+	struct inode *inode;
+	ino_t ino;
+
+	ino = iunique(parent->i_sb, 1);
+	inode = iget_locked(parent->i_sb, ino);
+	if (!inode)
+		return -ENOMEM;
+
+	sf_i = GET_INODE_INFO(inode);
+	sf_i->path = path;
+	sf_i->force_restat = 1;
+	sf_i->handle = handle;
+	sf_init_inode(sf_g, inode, info);
+
+	d_instantiate(dentry, inode);
+	unlock_new_inode(inode);
+
+	return 0;
+}
+
+/**
+ * Create a new regular file / directory.
+ * Return: 0 or negative errno value.
+ * @parent	inode of the directory
+ * @dentry	directory cache entry
+ * @mode	file mode
+ * @is_dir	true if directory, false otherwise
+ */
+static int sf_create_aux(struct inode *parent, struct dentry *dentry,
+			 umode_t mode, int is_dir)
+{
+	int err;
+	struct shfl_createparms params = {};
+	struct shfl_string *path;
+	struct sf_inode_info *sf_i = GET_INODE_INFO(parent);
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+
+	err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
+	if (err)
+		return err;
+
+	params.handle = SHFL_HANDLE_NIL;
+	params.create_flags = 0
+	    | SHFL_CF_ACT_CREATE_IF_NEW
+	    | SHFL_CF_ACT_FAIL_IF_EXISTS
+	    | SHFL_CF_ACCESS_READWRITE | (is_dir ? SHFL_CF_DIRECTORY : 0);
+	params.info.attr.mode = 0
+	    | (is_dir ? SHFL_TYPE_DIRECTORY : SHFL_TYPE_FILE)
+	    | (mode & 0777);
+	params.info.attr.additional = SHFLFSOBJATTRADD_NOTHING;
+
+	err = vboxsf_create(sf_g->root, path, &params);
+	if (err)
+		goto free_path;
+
+	if (params.result != SHFL_FILE_CREATED) {
+		err = -EPERM;
+		goto free_path;
+	}
+
+	err = sf_instantiate(parent, dentry, path, &params.info,
+			     is_dir ? SHFL_HANDLE_NIL : params.handle);
+	if (err)
+		goto close_handle;
+
+	/*
+	 * Don't close this handle right now. We assume that the same file is
+	 * opened with sf_reg_open() and later closed with sf_reg_close(). Save
+	 * the handle in between. Does not apply to directories. True?
+	 */
+	if (is_dir)
+		vboxsf_close(sf_g->root, params.handle);
+
+	sf_i->force_restat = 1;
+	return 0;
+
+close_handle:
+	vboxsf_close(sf_g->root, params.handle);
+
+free_path:
+	kfree(path);
+	return err;
+}
+
+/**
+ * Create a new regular file.
+ * Return: 0 or negative errno value.
+ * @parent	inode of the directory
+ * @dentry	directory cache entry
+ * @mode	file mode
+ * @excl	Possible O_EXCL...
+ */
+static int sf_create(struct inode *parent, struct dentry *dentry, umode_t mode,
+		     bool excl)
+{
+	return sf_create_aux(parent, dentry, mode, 0);
+}
+
+/**
+ * Create a new directory.
+ * Return: 0 or negative errno value.
+ * @parent	inode of the directory
+ * @dentry	directory cache entry
+ * @mode	file mode
+ */
+static int sf_mkdir(struct inode *parent, struct dentry *dentry, umode_t mode)
+{
+	return sf_create_aux(parent, dentry, mode, 1);
+}
+
+/**
+ * Remove a regular file / directory.
+ * Return: 0 or negative errno value.
+ * @parent	inode of the directory
+ * @dentry	directory cache entry
+ * @is_dir	true if directory, false otherwise
+ */
+static int sf_unlink_aux(struct inode *parent, struct dentry *dentry,
+			 int is_dir)
+{
+	int err;
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+	struct sf_inode_info *sf_i = GET_INODE_INFO(parent);
+	struct shfl_string *path;
+	uint32_t flags;
+
+	err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
+	if (err)
+		return err;
+
+	flags = is_dir ? SHFL_REMOVE_DIR : SHFL_REMOVE_FILE;
+	if (dentry
+	    && dentry->d_inode
+	    && ((dentry->d_inode->i_mode & S_IFLNK) == S_IFLNK))
+		flags |= SHFL_REMOVE_SYMLINK;
+
+	err = vboxsf_remove(sf_g->root, path, flags);
+	if (err)
+		goto free_path;
+
+	/* directory access/change time changed */
+	sf_i->force_restat = 1;
+	/* directory content changed */
+	sf_i->force_reread = 1;
+
+free_path:
+	kfree(path);
+	return err;
+}
+
+/**
+ * Remove a regular file.
+ * Return: 0 or negative errno value.
+ * @parent	inode of the directory
+ * @dentry	directory cache entry
+ */
+static int sf_unlink(struct inode *parent, struct dentry *dentry)
+{
+	return sf_unlink_aux(parent, dentry, 0);
+}
+
+/**
+ * Remove a directory.
+ * Return: 0 or negative errno value.
+ * @parent	inode of the directory
+ * @dentry	directory cache entry
+ */
+static int sf_rmdir(struct inode *parent, struct dentry *dentry)
+{
+	return sf_unlink_aux(parent, dentry, 1);
+}
+
+/**
+ * Rename a regular file / directory.
+ * Return: 0 or negative errno value.
+ * @old_parent	inode of the old parent directory
+ * @old_dentry	old directory cache entry
+ * @new_parent	inode of the new parent directory
+ * @new_dentry	new directory cache entry
+ * @flags	flags
+ */
+static int sf_rename(struct inode *old_parent, struct dentry *old_dentry,
+		     struct inode *new_parent, struct dentry *new_dentry,
+		     unsigned int flags)
+{
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(old_parent->i_sb);
+	u32 shfl_flags = SHFL_RENAME_FILE | SHFL_RENAME_REPLACE_IF_EXISTS;
+	struct sf_inode_info *sf_old_i = GET_INODE_INFO(old_parent);
+	struct sf_inode_info *sf_new_i = GET_INODE_INFO(new_parent);
+	/*
+	 * As we save the relative path inside the inode structure,
+	 * we need to change this if the rename is successful.
+	 */
+	struct sf_inode_info *sf_file_i = GET_INODE_INFO(old_dentry->d_inode);
+	struct shfl_string *path;
+	int err;
+
+	if (flags)
+		return -EINVAL;
+
+	if (sf_g != GET_GLOB_INFO(new_parent->i_sb))
+		return -EINVAL;
+
+	err = sf_path_from_dentry(__func__, sf_g, sf_new_i, new_dentry, &path);
+	if (err)
+		return err;
+
+	if (old_dentry->d_inode->i_mode & S_IFDIR)
+		shfl_flags = 0;
+
+	err = vboxsf_rename(sf_g->root, sf_file_i->path, path, shfl_flags);
+	if (err == 0) {
+		/* Set the new relative path in the inode. */
+		kfree(sf_file_i->path);
+		sf_file_i->path = path;
+		sf_new_i->force_restat = 1;
+		sf_old_i->force_restat = 1;
+	} else {
+		kfree(path);
+	}
+
+	return err;
+}
+
+static int sf_symlink(struct inode *parent, struct dentry *dentry,
+		      const char *symname)
+{
+	int err;
+	struct sf_inode_info *sf_i;
+	struct sf_glob_info *sf_g;
+	struct shfl_string *path, *ssymname;
+	struct shfl_fsobjinfo info;
+	int symname_len = strlen(symname) + 1;
+
+	sf_g = GET_GLOB_INFO(parent->i_sb);
+	sf_i = GET_INODE_INFO(parent);
+
+	err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
+	if (err)
+		return err;
+
+	ssymname = kmalloc(SHFLSTRING_HEADER_SIZE + symname_len, GFP_KERNEL);
+	if (!ssymname) {
+		err = -ENOMEM;
+		goto free_path;
+	}
+	ssymname->length = symname_len - 1;
+	ssymname->size = symname_len;
+	memcpy(ssymname->string.utf8, symname, symname_len);
+
+	err = vboxsf_symlink(sf_g->root, path, ssymname, &info);
+	kfree(ssymname);
+
+	if (err)
+		goto free_path;
+
+	err = sf_instantiate(parent, dentry, path, &info, SHFL_HANDLE_NIL);
+	if (err)
+		goto free_path;
+
+	sf_i->force_restat = 1;
+	return 0;
+
+free_path:
+	kfree(path);
+	return err;
+}
+
+const struct inode_operations sf_dir_iops = {
+	.lookup = sf_lookup,
+	.create = sf_create,
+	.mkdir = sf_mkdir,
+	.rmdir = sf_rmdir,
+	.unlink = sf_unlink,
+	.rename = sf_rename,
+	.getattr = sf_getattr,
+	.setattr = sf_setattr,
+	.symlink = sf_symlink
+};
diff --git a/fs/vboxsf/file.c b/fs/vboxsf/file.c
new file mode 100644
index 000000000000..8e085a28cf91
--- /dev/null
+++ b/fs/vboxsf/file.c
@@ -0,0 +1,416 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VirtualBox Guest Shared Folders support: Regular file inode and file ops.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/sizes.h>
+#include "vfsmod.h"
+
+/**
+ * Read from a regular file.
+ * Return: The number of bytes read on success, negative errno value otherwise
+ * @file	the file
+ * @buf		the buffer
+ * @size	length of the buffer
+ * @off		offset within the file
+ */
+static ssize_t sf_reg_read(struct file *file, char *buf, size_t size,
+			   loff_t *off)
+{
+	struct inode *inode = GET_F_DENTRY(file)->d_inode;
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_reg_info *sf_r = file->private_data;
+	u64 pos = *off;
+	u32 nread;
+	int err;
+
+	if (!size)
+		return 0;
+
+	if (size > SHFL_MAX_RW_COUNT)
+		nread = SHFL_MAX_RW_COUNT;
+	else
+		nread = size;
+
+	err = vboxsf_read(sf_g->root, sf_r->handle, pos, &nread, buf, true);
+	if (err)
+		return err;
+
+	*off += nread;
+	return nread;
+}
+
+/**
+ * Write to a regular file.
+ * Return: The number of bytes written on success, negative errno val otherwise
+ * @file	the file
+ * @buf		the buffer
+ * @size	length of the buffer
+ * @off		offset within the file
+ */
+static ssize_t sf_reg_write(struct file *file, const char *buf, size_t size,
+			    loff_t *off)
+{
+	struct inode *inode = GET_F_DENTRY(file)->d_inode;
+	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_reg_info *sf_r = file->private_data;
+	u32 nwritten;
+	u64 pos;
+	int err;
+
+	pos = *off;
+	if (file->f_flags & O_APPEND) {
+		pos = inode->i_size;
+		*off = pos;
+	}
+
+	if (!size)
+		return 0;
+
+	if (size > SHFL_MAX_RW_COUNT)
+		nwritten = SHFL_MAX_RW_COUNT;
+	else
+		nwritten = size;
+
+	err = vboxsf_write(sf_g->root, sf_r->handle, pos, &nwritten, buf, true);
+	if (err)
+		return err;
+
+	*off += nwritten;
+	if (*off > inode->i_size)
+		i_size_write(inode, *off);
+
+	sf_i->force_restat = 1;
+	return nwritten;
+}
+
+/**
+ * Open a regular file.
+ * Return: 0 or negative errno value.
+ * @inode	inode
+ * @file	file
+ */
+static int sf_reg_open(struct inode *inode, struct file *file)
+{
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+	struct sf_reg_info *sf_r;
+	struct shfl_createparms params = {};
+	int err;
+
+	sf_r = kmalloc(sizeof(*sf_r), GFP_KERNEL);
+	if (!sf_r)
+		return -ENOMEM;
+
+	/* Already open? */
+	if (sf_i->handle != SHFL_HANDLE_NIL) {
+		/*
+		 * This inode was created with sf_create_aux(). Check the
+		 * create_flags: O_CREAT, O_TRUNC: inherent true (file was
+		 * just created).
+		 * Not sure about the access flags (SHFL_CF_ACCESS_*).
+		 */
+		sf_i->force_restat = 1;
+		sf_r->handle = sf_i->handle;
+		sf_i->handle = SHFL_HANDLE_NIL;
+		sf_i->file = file;
+		file->private_data = sf_r;
+		return 0;
+	}
+
+	params.handle = SHFL_HANDLE_NIL;
+
+	/*
+	 * We check the value of params.handle afterwards to find out if
+	 * the call succeeded or failed, as the API does not seem to cleanly
+	 * distinguish error and informational messages.
+	 *
+	 * Furthermore, we must set params.handle to SHFL_HANDLE_NIL to
+	 * make the shared folders host service use our mode parameter.
+	 */
+	if (file->f_flags & O_CREAT) {
+		params.create_flags |= SHFL_CF_ACT_CREATE_IF_NEW;
+		/*
+		 * We ignore O_EXCL, as the Linux kernel seems to call create
+		 * beforehand itself, so O_EXCL should always fail.
+		 */
+		if (file->f_flags & O_TRUNC)
+			params.create_flags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
+		else
+			params.create_flags |= SHFL_CF_ACT_OPEN_IF_EXISTS;
+	} else {
+		params.create_flags |= SHFL_CF_ACT_FAIL_IF_NEW;
+		if (file->f_flags & O_TRUNC)
+			params.create_flags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
+	}
+
+	switch (file->f_flags & O_ACCMODE) {
+	case O_RDONLY:
+		params.create_flags |= SHFL_CF_ACCESS_READ;
+		break;
+
+	case O_WRONLY:
+		params.create_flags |= SHFL_CF_ACCESS_WRITE;
+		break;
+
+	case O_RDWR:
+		params.create_flags |= SHFL_CF_ACCESS_READWRITE;
+		break;
+
+	default:
+		WARN_ON(1);
+	}
+
+	if (file->f_flags & O_APPEND)
+		params.create_flags |= SHFL_CF_ACCESS_APPEND;
+
+	params.info.attr.mode = inode->i_mode;
+	err = vboxsf_create(sf_g->root, sf_i->path, &params);
+	if (err == 0 && params.handle == SHFL_HANDLE_NIL)
+		err = (params.result == SHFL_FILE_EXISTS) ? -EEXIST : -ENOENT;
+	if (err) {
+		kfree(sf_r);
+		return err;
+	}
+
+	sf_i->force_restat = 1;
+	sf_r->handle = params.handle;
+	sf_i->file = file;
+	file->private_data = sf_r;
+	return 0;
+}
+
+/**
+ * Close a regular file.
+ * Return: 0 or negative errno value.
+ * @inode	inode
+ * @file	file
+ */
+static int sf_reg_release(struct inode *inode, struct file *file)
+{
+	struct sf_reg_info *sf_r;
+	struct sf_glob_info *sf_g;
+	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+
+	sf_g = GET_GLOB_INFO(inode->i_sb);
+	sf_r = file->private_data;
+
+	filemap_write_and_wait(inode->i_mapping);
+
+	vboxsf_close(sf_g->root, sf_r->handle);
+
+	kfree(sf_r);
+	sf_i->file = NULL;
+	sf_i->handle = SHFL_HANDLE_NIL;
+	file->private_data = NULL;
+	return 0;
+}
+
+static int sf_reg_fault(struct vm_fault *vmf)
+{
+	struct vm_area_struct *vma = vmf->vma;
+	struct file *file = vma->vm_file;
+	struct inode *inode = GET_F_DENTRY(file)->d_inode;
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_reg_info *sf_r = file->private_data;
+	u32 nread = PAGE_SIZE;
+	struct page *page;
+	u64 off;
+	u8 *buf;
+	int err;
+
+	if (vmf->pgoff > vma->vm_end)
+		return VM_FAULT_SIGBUS;
+
+	/* No GFP_HIGHUSER, the page must have a valid virtual address. */
+	page = alloc_page(GFP_USER);
+	if (!page)
+		return VM_FAULT_OOM;
+
+	buf = kmap(page);
+	off = (vmf->pgoff << PAGE_SHIFT);
+	err = vboxsf_read(sf_g->root, sf_r->handle, off, &nread, buf, false);
+	if (err) {
+		kunmap(page);
+		put_page(page);
+		return VM_FAULT_SIGBUS;
+	}
+
+	if (!nread)
+		clear_user_page(page_address(page), vmf->pgoff, page);
+	else
+		memset(buf + nread, 0, PAGE_SIZE - nread);
+
+	flush_dcache_page(page);
+	kunmap(page);
+	vmf->page = page;
+	return 0;
+}
+
+static const struct vm_operations_struct sf_vma_ops = {
+	.fault = sf_reg_fault
+};
+
+static int sf_reg_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	if (vma->vm_flags & VM_SHARED)
+		return -EINVAL;
+
+	vma->vm_ops = &sf_vma_ops;
+	return 0;
+}
+
+const struct file_operations sf_reg_fops = {
+	.read = sf_reg_read,
+	.open = sf_reg_open,
+	.write = sf_reg_write,
+	.release = sf_reg_release,
+	.mmap = sf_reg_mmap,
+	.splice_read = generic_file_splice_read,
+	.read_iter = generic_file_read_iter,
+	.write_iter = generic_file_write_iter,
+	.fsync = noop_fsync,
+	.llseek = generic_file_llseek,
+};
+
+const struct inode_operations sf_reg_iops = {
+	.getattr = sf_getattr,
+	.setattr = sf_setattr
+};
+
+static int sf_readpage(struct file *file, struct page *page)
+{
+	struct inode *inode = GET_F_DENTRY(file)->d_inode;
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_reg_info *sf_r = file->private_data;
+	u64 off = page_offset(page);
+	u32 nread = PAGE_SIZE;
+	u8 *buf;
+	int err;
+
+	buf = kmap(page);
+
+	err = vboxsf_read(sf_g->root, sf_r->handle, off, &nread, buf, false);
+	if (err == 0) {
+		memset(&buf[nread], 0, PAGE_SIZE - nread);
+		flush_dcache_page(page);
+		SetPageUptodate(page);
+	} else {
+		SetPageError(page);
+	}
+
+	kunmap(page);
+	unlock_page(page);
+	return err;
+}
+
+static int sf_writepage(struct page *page, struct writeback_control *wbc)
+{
+	struct address_space *mapping = page->mapping;
+	struct inode *inode = mapping->host;
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+	struct file *file = sf_i->file;
+	struct sf_reg_info *sf_r = file->private_data;
+	int end_index = inode->i_size >> PAGE_SHIFT;
+	u64 off = page_offset(page);
+	u32 nwritten = PAGE_SIZE;
+	u8 *buf;
+	int err;
+
+	if (page->index >= end_index)
+		nwritten = inode->i_size & (PAGE_SIZE - 1);
+
+	buf = kmap(page);
+	err = vboxsf_write(sf_g->root, sf_r->handle, off, &nwritten, buf, false);
+	kunmap(page);
+
+	if (err == 0)
+		ClearPageError(page);
+	else
+		ClearPageUptodate(page);
+
+	unlock_page(page);
+	return err;
+}
+
+int sf_write_begin(struct file *file, struct address_space *mapping, loff_t pos,
+		   unsigned int len, unsigned int flags, struct page **pagep,
+		   void **fsdata)
+{
+	return simple_write_begin(file, mapping, pos, len, flags, pagep,
+				  fsdata);
+}
+
+int sf_write_end(struct file *file, struct address_space *mapping, loff_t pos,
+		 unsigned int len, unsigned int copied, struct page *page,
+		 void *fsdata)
+{
+	struct inode *inode = mapping->host;
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_reg_info *sf_r = file->private_data;
+	unsigned int from = pos & (PAGE_SIZE - 1);
+	u32 nwritten = len;
+	u8 *buf;
+	int err;
+
+	buf = kmap(page);
+	err = vboxsf_write(sf_g->root, sf_r->handle, pos, &nwritten,
+			  buf + from, false);
+	kunmap(page);
+
+	if (err)
+		goto out;
+
+	if (!PageUptodate(page) && nwritten == PAGE_SIZE)
+		SetPageUptodate(page);
+
+	pos += nwritten;
+	if (pos > inode->i_size)
+		i_size_write(inode, pos);
+
+out:
+	unlock_page(page);
+	put_page(page);
+
+	return err;
+}
+
+const struct address_space_operations sf_reg_aops = {
+	.readpage = sf_readpage,
+	.writepage = sf_writepage,
+	.write_begin = sf_write_begin,
+	.write_end = sf_write_end,
+};
+
+static const char *sf_get_link(struct dentry *dentry, struct inode *inode,
+			       struct delayed_call *done)
+{
+	struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+	struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+	char *path;
+	int err;
+
+	if (!dentry)
+		return ERR_PTR(-ECHILD);
+
+	path = kzalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!path)
+		return ERR_PTR(-ENOMEM);
+
+	err = vboxsf_readlink(sf_g->root, sf_i->path, PATH_MAX, path);
+	if (err) {
+		kfree(path);
+		return ERR_PTR(err);
+	}
+
+	set_delayed_call(done, kfree_link, path);
+	return path;
+}
+
+const struct inode_operations sf_lnk_iops = {
+	.get_link = sf_get_link
+};
diff --git a/fs/vboxsf/shfl_hostintf.h b/fs/vboxsf/shfl_hostintf.h
new file mode 100644
index 000000000000..8666a5347a0b
--- /dev/null
+++ b/fs/vboxsf/shfl_hostintf.h
@@ -0,0 +1,919 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */
+/*
+ * VirtualBox Shared Folders: host interface definition.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#ifndef SHFL_HOSTINTF_H
+#define SHFL_HOSTINTF_H
+
+#include <linux/vbox_vmmdev_types.h>
+
+/* The max in/out buffer size for a FN_READ or FN_WRITE call */
+#define SHFL_MAX_RW_COUNT           (16 * SZ_1M)
+
+/*
+ * Structures shared between guest and the service
+ * can be relocated and use offsets to point to variable
+ * length parts.
+ *
+ * Shared folders protocol works with handles.
+ * Before doing any action on a file system object,
+ * one have to obtain the object handle via a SHFL_FN_CREATE
+ * request. A handle must be closed with SHFL_FN_CLOSE.
+ */
+
+/* Query mappings changes. */
+#define SHFL_FN_QUERY_MAPPINGS      (1)
+/* Query mappings changes. */
+#define SHFL_FN_QUERY_MAP_NAME      (2)
+/* Open/create object. */
+#define SHFL_FN_CREATE              (3)
+/* Close object handle. */
+#define SHFL_FN_CLOSE               (4)
+/* Read object content. */
+#define SHFL_FN_READ                (5)
+/* Write new object content. */
+#define SHFL_FN_WRITE               (6)
+/* Lock/unlock a range in the object. */
+#define SHFL_FN_LOCK                (7)
+/* List object content. */
+#define SHFL_FN_LIST                (8)
+/* Query/set object information. */
+#define SHFL_FN_INFORMATION         (9)
+/* Remove object */
+#define SHFL_FN_REMOVE              (11)
+/* Map folder (legacy) */
+#define SHFL_FN_MAP_FOLDER_OLD      (12)
+/* Unmap folder */
+#define SHFL_FN_UNMAP_FOLDER        (13)
+/* Rename object (possibly moving it to another directory) */
+#define SHFL_FN_RENAME              (14)
+/* Flush file */
+#define SHFL_FN_FLUSH               (15)
+#define SHFL_FN_SET_UTF8            (16)
+#define SHFL_CPARMS_SET_UTF8        0
+/* Map folder */
+#define SHFL_FN_MAP_FOLDER          (17)
+/* Read symlink destination (as of VBox 4.0) */
+#define SHFL_FN_READLINK            (18)
+/* Create symlink (as of VBox 4.0) */
+#define SHFL_FN_SYMLINK             (19)
+/* Ask host to show symlinks (as of VBox 4.0) */
+#define SHFL_FN_SET_SYMLINKS        (20)
+#define SHFL_CPARMS_SET_SYMLINKS    0
+
+/* Root handles for a mapping are of type u32, Root handles are unique. */
+#define SHFL_ROOT_NIL ((u32)~0)
+
+/* Shared folders handle for an opened object are of type u64. */
+#define SHFL_HANDLE_NIL  ((u64)~0LL)
+#define SHFL_HANDLE_ROOT ((u64)0LL)
+
+/* Hardcoded maximum length (in chars) of a shared folder name. */
+#define SHFL_MAX_LEN         (256)
+/* Hardcoded maximum number of shared folder mapping available to the guest. */
+#define SHFL_MAX_MAPPINGS    (64)
+
+/** Shared folder string buffer structure. */
+struct shfl_string {
+	/** Allocated size of the string member in bytes. */
+	u16 size;
+
+	/** Length of string without trailing nul in bytes. */
+	u16 length;
+
+	/** UTF-8 or UTF-16 string. Nul terminated. */
+	union {
+		u8 utf8[1];
+		u16 utf16[1];
+		u16 ucs2[1]; /* misnomer, use utf16. */
+	} string;
+};
+VMMDEV_ASSERT_SIZE(shfl_string, 6);
+
+/* The size of shfl_string w/o the string part. */
+#define SHFLSTRING_HEADER_SIZE  4
+
+/* Calculate size of the string. */
+static inline u32 shfl_string_buf_size(const struct shfl_string *string)
+{
+	return string ? SHFLSTRING_HEADER_SIZE + string->size : 0;
+}
+
+/* Set user id on execution (S_ISUID). */
+#define SHFL_UNIX_ISUID             0004000U
+/* Set group id on execution (S_ISGID). */
+#define SHFL_UNIX_ISGID             0002000U
+/* Sticky bit (S_ISVTX / S_ISTXT). */
+#define SHFL_UNIX_ISTXT             0001000U
+
+/* Owner readable (S_IRUSR). */
+#define SHFL_UNIX_IRUSR             0000400U
+/* Owner writable (S_IWUSR). */
+#define SHFL_UNIX_IWUSR             0000200U
+/* Owner executable (S_IXUSR). */
+#define SHFL_UNIX_IXUSR             0000100U
+
+/* Group readable (S_IRGRP). */
+#define SHFL_UNIX_IRGRP             0000040U
+/* Group writable (S_IWGRP). */
+#define SHFL_UNIX_IWGRP             0000020U
+/* Group executable (S_IXGRP). */
+#define SHFL_UNIX_IXGRP             0000010U
+
+/* Other readable (S_IROTH). */
+#define SHFL_UNIX_IROTH             0000004U
+/* Other writable (S_IWOTH). */
+#define SHFL_UNIX_IWOTH             0000002U
+/* Other executable (S_IXOTH). */
+#define SHFL_UNIX_IXOTH             0000001U
+
+/* Named pipe (fifo) (S_IFIFO). */
+#define SHFL_TYPE_FIFO              0010000U
+/* Character device (S_IFCHR). */
+#define SHFL_TYPE_DEV_CHAR          0020000U
+/* Directory (S_IFDIR). */
+#define SHFL_TYPE_DIRECTORY         0040000U
+/* Block device (S_IFBLK). */
+#define SHFL_TYPE_DEV_BLOCK         0060000U
+/* Regular file (S_IFREG). */
+#define SHFL_TYPE_FILE              0100000U
+/* Symbolic link (S_IFLNK). */
+#define SHFL_TYPE_SYMLINK           0120000U
+/* Socket (S_IFSOCK). */
+#define SHFL_TYPE_SOCKET            0140000U
+/* Whiteout (S_IFWHT). */
+#define SHFL_TYPE_WHITEOUT          0160000U
+/* Type mask (S_IFMT). */
+#define SHFL_TYPE_MASK              0170000U
+
+/* Checks the mode flags indicate a directory (S_ISDIR). */
+#define SHFL_IS_DIRECTORY(m)   (((m) & SHFL_TYPE_MASK) == SHFL_TYPE_DIRECTORY)
+/* Checks the mode flags indicate a symbolic link (S_ISLNK). */
+#define SHFL_IS_SYMLINK(m)     (((m) & SHFL_TYPE_MASK) == SHFL_TYPE_SYMLINK)
+
+/** The available additional information in a shfl_fsobjattr object. */
+enum shfl_fsobjattr_add {
+	/** No additional information is available / requested. */
+	SHFLFSOBJATTRADD_NOTHING = 1,
+	/**
+	 * The additional unix attributes (shfl_fsobjattr::u::unix_attr) are
+	 *  available / requested.
+	 */
+	SHFLFSOBJATTRADD_UNIX,
+	/**
+	 * The additional extended attribute size (shfl_fsobjattr::u::size) is
+	 *  available / requested.
+	 */
+	SHFLFSOBJATTRADD_EASIZE,
+	/**
+	 * The last valid item (inclusive).
+	 * The valid range is SHFLFSOBJATTRADD_NOTHING thru
+	 * SHFLFSOBJATTRADD_LAST.
+	 */
+	SHFLFSOBJATTRADD_LAST = SHFLFSOBJATTRADD_EASIZE,
+
+	/** The usual 32-bit hack. */
+	SHFLFSOBJATTRADD_32BIT_SIZE_HACK = 0x7fffffff
+};
+
+/**
+ * Additional unix Attributes, these are available when
+ * shfl_fsobjattr.additional == SHFLFSOBJATTRADD_UNIX.
+ */
+struct shfl_fsobjattr_unix {
+	/**
+	 * The user owning the filesystem object (st_uid).
+	 * This field is ~0U if not supported.
+	 */
+	u32 uid;
+
+	/**
+	 * The group the filesystem object is assigned (st_gid).
+	 * This field is ~0U if not supported.
+	 */
+	u32 gid;
+
+	/**
+	 * Number of hard links to this filesystem object (st_nlink).
+	 * This field is 1 if the filesystem doesn't support hardlinking or
+	 * the information isn't available.
+	 */
+	u32 hardlinks;
+
+	/**
+	 * The device number of the device which this filesystem object resides
+	 * on (st_dev). This field is 0 if this information is not available.
+	 */
+	u32 inode_id_device;
+
+	/**
+	 * The unique identifier (within the filesystem) of this filesystem
+	 * object (st_ino). Together with inode_id_device, this field can be
+	 * used as a OS wide unique id, when both their values are not 0.
+	 * This field is 0 if the information is not available.
+	 */
+	u64 inode_id;
+
+	/**
+	 * User flags (st_flags).
+	 * This field is 0 if this information is not available.
+	 */
+	u32 flags;
+
+	/**
+	 * The current generation number (st_gen).
+	 * This field is 0 if this information is not available.
+	 */
+	u32 generation_id;
+
+	/**
+	 * The device number of a char. or block device type object (st_rdev).
+	 * This field is 0 if the file isn't a char. or block device or when
+	 * the OS doesn't use the major+minor device idenfication scheme.
+	 */
+	u32 device;
+} __packed;
+
+/** Extended attribute size. */
+struct shfl_fsobjattr_easize {
+	/** Size of EAs. */
+	s64 cb;
+} __packed;
+
+/** Shared folder filesystem object attributes. */
+struct shfl_fsobjattr {
+	/** Mode flags (st_mode). SHFL_UNIX_*, SHFL_TYPE_*, and SHFL_DOS_*. */
+	u32 mode;
+
+	/** The additional attributes available. */
+	enum shfl_fsobjattr_add additional;
+
+	/**
+	 * Additional attributes.
+	 *
+	 * Unless explicitly specified to an API, the API can provide additional
+	 * data as it is provided by the underlying OS.
+	 */
+	union {
+		struct shfl_fsobjattr_unix unix_attr;
+		struct shfl_fsobjattr_easize size;
+	} __packed u;
+} __packed;
+VMMDEV_ASSERT_SIZE(shfl_fsobjattr, 44);
+
+struct shfl_timespec {
+	s64 ns_relative_to_unix_epoch;
+};
+
+/** Filesystem object information structure. */
+struct shfl_fsobjinfo {
+	/**
+	 * Logical size (st_size).
+	 * For normal files this is the size of the file.
+	 * For symbolic links, this is the length of the path name contained
+	 * in the symbolic link.
+	 * For other objects this fields needs to be specified.
+	 */
+	s64 size;
+
+	/** Disk allocation size (st_blocks * DEV_BSIZE). */
+	s64 allocated;
+
+	/** Time of last access (st_atime). */
+	struct shfl_timespec access_time;
+
+	/** Time of last data modification (st_mtime). */
+	struct shfl_timespec modification_time;
+
+	/**
+	 * Time of last status change (st_ctime).
+	 * If not available this is set to modification_time.
+	 */
+	struct shfl_timespec change_time;
+
+	/**
+	 * Time of file birth (st_birthtime).
+	 * If not available this is set to change_time.
+	 */
+	struct shfl_timespec birth_time;
+
+	/** Attributes. */
+	struct shfl_fsobjattr attr;
+
+} __packed;
+VMMDEV_ASSERT_SIZE(shfl_fsobjinfo, 92);
+
+/**
+ * result of an open/create request.
+ * Along with handle value the result code
+ * identifies what has happened while
+ * trying to open the object.
+ */
+enum shfl_create_result {
+	SHFL_NO_RESULT,
+	/** Specified path does not exist. */
+	SHFL_PATH_NOT_FOUND,
+	/** Path to file exists, but the last component does not. */
+	SHFL_FILE_NOT_FOUND,
+	/** File already exists and either has been opened or not. */
+	SHFL_FILE_EXISTS,
+	/** New file was created. */
+	SHFL_FILE_CREATED,
+	/** Existing file was replaced or overwritten. */
+	SHFL_FILE_REPLACED
+};
+
+/* No flags. Initialization value. */
+#define SHFL_CF_NONE                  (0x00000000)
+
+/*
+ * Only lookup the object, do not return a handle. When this is set all other
+ * flags are ignored.
+ */
+#define SHFL_CF_LOOKUP                (0x00000001)
+
+/*
+ * Open parent directory of specified object.
+ * Useful for the corresponding Windows FSD flag
+ * and for opening paths like \\dir\\*.* to search the 'dir'.
+ */
+#define SHFL_CF_OPEN_TARGET_DIRECTORY (0x00000002)
+
+/* Create/open a directory. */
+#define SHFL_CF_DIRECTORY             (0x00000004)
+
+/*
+ *  Open/create action to do if object exists
+ *  and if the object does not exists.
+ *  REPLACE file means atomically DELETE and CREATE.
+ *  OVERWRITE file means truncating the file to 0 and
+ *  setting new size.
+ *  When opening an existing directory REPLACE and OVERWRITE
+ *  actions are considered invalid, and cause returning
+ *  FILE_EXISTS with NIL handle.
+ */
+#define SHFL_CF_ACT_MASK_IF_EXISTS      (0x000000f0)
+#define SHFL_CF_ACT_MASK_IF_NEW         (0x00000f00)
+
+/* What to do if object exists. */
+#define SHFL_CF_ACT_OPEN_IF_EXISTS      (0x00000000)
+#define SHFL_CF_ACT_FAIL_IF_EXISTS      (0x00000010)
+#define SHFL_CF_ACT_REPLACE_IF_EXISTS   (0x00000020)
+#define SHFL_CF_ACT_OVERWRITE_IF_EXISTS (0x00000030)
+
+/* What to do if object does not exist. */
+#define SHFL_CF_ACT_CREATE_IF_NEW       (0x00000000)
+#define SHFL_CF_ACT_FAIL_IF_NEW         (0x00000100)
+
+/* Read/write requested access for the object. */
+#define SHFL_CF_ACCESS_MASK_RW          (0x00003000)
+
+/* No access requested. */
+#define SHFL_CF_ACCESS_NONE             (0x00000000)
+/* Read access requested. */
+#define SHFL_CF_ACCESS_READ             (0x00001000)
+/* Write access requested. */
+#define SHFL_CF_ACCESS_WRITE            (0x00002000)
+/* Read/Write access requested. */
+#define SHFL_CF_ACCESS_READWRITE	(0x00003000)
+
+/* Requested share access for the object. */
+#define SHFL_CF_ACCESS_MASK_DENY        (0x0000c000)
+
+/* Allow any access. */
+#define SHFL_CF_ACCESS_DENYNONE         (0x00000000)
+/* Do not allow read. */
+#define SHFL_CF_ACCESS_DENYREAD         (0x00004000)
+/* Do not allow write. */
+#define SHFL_CF_ACCESS_DENYWRITE        (0x00008000)
+/* Do not allow access. */
+#define SHFL_CF_ACCESS_DENYALL          (0x0000c000)
+
+/* Requested access to attributes of the object. */
+#define SHFL_CF_ACCESS_MASK_ATTR        (0x00030000)
+
+/* No access requested. */
+#define SHFL_CF_ACCESS_ATTR_NONE        (0x00000000)
+/* Read access requested. */
+#define SHFL_CF_ACCESS_ATTR_READ        (0x00010000)
+/* Write access requested. */
+#define SHFL_CF_ACCESS_ATTR_WRITE       (0x00020000)
+/* Read/Write access requested. */
+#define SHFL_CF_ACCESS_ATTR_READWRITE   (0x00030000)
+
+/*
+ * The file is opened in append mode.
+ * Ignored if SHFL_CF_ACCESS_WRITE is not set.
+ */
+#define SHFL_CF_ACCESS_APPEND           (0x00040000)
+
+/** Create parameters buffer struct for SHFL_FN_CREATE call */
+struct shfl_createparms {
+	/** Returned handle of opened object. */
+	u64 handle;
+
+	/** Returned result of the operation */
+	enum shfl_create_result result;
+
+	/** SHFL_CF_* */
+	u32 create_flags;
+
+	/**
+	 * Attributes of object to create and
+	 * returned actual attributes of opened/created object.
+	 */
+	struct shfl_fsobjinfo info;
+} __packed;
+
+/** Shared Folder directory information */
+struct shfl_dirinfo {
+	/** Full information about the object. */
+	struct shfl_fsobjinfo info;
+	/**
+	 * The length of the short field (number of UTF16 chars).
+	 * It is 16-bit for reasons of alignment.
+	 */
+	u16 short_name_len;
+	/**
+	 * The short name for 8.3 compatibility.
+	 * Empty string if not available.
+	 */
+	u16 short_name[14];
+	struct shfl_string name;
+};
+
+/** Shared folder filesystem properties. */
+struct shfl_fsproperties {
+	/**
+	 * The maximum size of a filesystem object name.
+	 * This does not include the '\\0'.
+	 */
+	u32 max_component_len;
+
+	/**
+	 * True if the filesystem is remote.
+	 * False if the filesystem is local.
+	 */
+	bool remote;
+
+	/**
+	 * True if the filesystem is case sensitive.
+	 * False if the filesystem is case insensitive.
+	 */
+	bool case_sensitive;
+
+	/**
+	 * True if the filesystem is mounted read only.
+	 * False if the filesystem is mounted read write.
+	 */
+	bool read_only;
+
+	/**
+	 * True if the filesystem can encode unicode object names.
+	 * False if it can't.
+	 */
+	bool supports_unicode;
+
+	/**
+	 * True if the filesystem is compresses.
+	 * False if it isn't or we don't know.
+	 */
+	bool compressed;
+
+	/**
+	 * True if the filesystem compresses of individual files.
+	 * False if it doesn't or we don't know.
+	 */
+	bool file_compression;
+};
+VMMDEV_ASSERT_SIZE(shfl_fsproperties, 12);
+
+struct shfl_volinfo {
+	s64 total_allocation_bytes;
+	s64 available_allocation_bytes;
+	u32 bytes_per_allocation_unit;
+	u32 bytes_per_sector;
+	u32 serial;
+	struct shfl_fsproperties properties;
+};
+
+
+/** SHFL_FN_MAP_FOLDER Parameters structure. */
+struct shfl_map_folder {
+	/**
+	 * pointer, in:
+	 * Points to struct shfl_string buffer.
+	 */
+	struct vmmdev_hgcm_function_parameter path;
+
+	/**
+	 * pointer, out: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * pointer, in: UTF16
+	 * Path delimiter
+	 */
+	struct vmmdev_hgcm_function_parameter delimiter;
+
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Case senstive flag
+	 */
+	struct vmmdev_hgcm_function_parameter case_sensitive;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_MAP_FOLDER (4)
+
+
+/** SHFL_FN_UNMAP_FOLDER Parameters structure. */
+struct shfl_unmap_folder {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_UNMAP_FOLDER (1)
+
+
+/** SHFL_FN_CREATE Parameters structure. */
+struct shfl_create {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * pointer, in:
+	 * Points to struct shfl_string buffer.
+	 */
+	struct vmmdev_hgcm_function_parameter path;
+
+	/**
+	 * pointer, in/out:
+	 * Points to struct shfl_createparms buffer.
+	 */
+	struct vmmdev_hgcm_function_parameter parms;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_CREATE (3)
+
+
+/** SHFL_FN_CLOSE Parameters structure. */
+struct shfl_close {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * value64, in:
+	 * SHFLHANDLE (u64) of object to close.
+	 */
+	struct vmmdev_hgcm_function_parameter handle;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_CLOSE (2)
+
+
+/** SHFL_FN_READ Parameters structure. */
+struct shfl_read {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * value64, in:
+	 * SHFLHANDLE (u64) of object to read from.
+	 */
+	struct vmmdev_hgcm_function_parameter handle;
+
+	/**
+	 * value64, in:
+	 * Offset to read from.
+	 */
+	struct vmmdev_hgcm_function_parameter offset;
+
+	/**
+	 * value64, in/out:
+	 * Bytes to read/How many were read.
+	 */
+	struct vmmdev_hgcm_function_parameter cb;
+
+	/**
+	 * pointer, out:
+	 * Buffer to place data to.
+	 */
+	struct vmmdev_hgcm_function_parameter buffer;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_READ (5)
+
+
+/** SHFL_FN_WRITE Parameters structure. */
+struct shfl_write {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * value64, in:
+	 * SHFLHANDLE (u64) of object to write to.
+	 */
+	struct vmmdev_hgcm_function_parameter handle;
+
+	/**
+	 * value64, in:
+	 * Offset to write to.
+	 */
+	struct vmmdev_hgcm_function_parameter offset;
+
+	/**
+	 * value64, in/out:
+	 * Bytes to write/How many were written.
+	 */
+	struct vmmdev_hgcm_function_parameter cb;
+
+	/**
+	 * pointer, in:
+	 * Data to write.
+	 */
+	struct vmmdev_hgcm_function_parameter buffer;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_WRITE (5)
+
+
+/*
+ * SHFL_FN_LIST
+ * Listing information includes variable length RTDIRENTRY[EX] structures.
+ */
+
+#define SHFL_LIST_NONE			0
+#define SHFL_LIST_RETURN_ONE		1
+
+/** SHFL_FN_LIST Parameters structure. */
+struct shfl_list {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * value64, in:
+	 * SHFLHANDLE (u64) of object to be listed.
+	 */
+	struct vmmdev_hgcm_function_parameter handle;
+
+	/**
+	 * value32, in:
+	 * List flags SHFL_LIST_*.
+	 */
+	struct vmmdev_hgcm_function_parameter flags;
+
+	/**
+	 * value32, in/out:
+	 * Bytes to be used for listing information/How many bytes were used.
+	 */
+	struct vmmdev_hgcm_function_parameter cb;
+
+	/**
+	 * pointer, in/optional
+	 * Points to struct shfl_string buffer that specifies a search path.
+	 */
+	struct vmmdev_hgcm_function_parameter path;
+
+	/**
+	 * pointer, out:
+	 * Buffer to place listing information to. (struct shfl_dirinfo)
+	 */
+	struct vmmdev_hgcm_function_parameter buffer;
+
+	/**
+	 * value32, in/out:
+	 * Indicates a key where the listing must be resumed.
+	 * in: 0 means start from begin of object.
+	 * out: 0 means listing completed.
+	 */
+	struct vmmdev_hgcm_function_parameter resume_point;
+
+	/**
+	 * pointer, out:
+	 * Number of files returned
+	 */
+	struct vmmdev_hgcm_function_parameter file_count;
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_LIST (8)
+
+
+/** SHFL_FN_READLINK Parameters structure. */
+struct shfl_readLink {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * pointer, in:
+	 * Points to struct shfl_string buffer.
+	 */
+	struct vmmdev_hgcm_function_parameter path;
+
+	/**
+	 * pointer, out:
+	 * Buffer to place data to.
+	 */
+	struct vmmdev_hgcm_function_parameter buffer;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_READLINK (3)
+
+
+/* SHFL_FN_INFORMATION */
+
+/* Mask of Set/Get bit. */
+#define SHFL_INFO_MODE_MASK    (0x1)
+/* Get information */
+#define SHFL_INFO_GET          (0x0)
+/* Set information */
+#define SHFL_INFO_SET          (0x1)
+
+/* Get name of the object. */
+#define SHFL_INFO_NAME         (0x2)
+/* Set size of object (extend/trucate); only applies to file objects */
+#define SHFL_INFO_SIZE         (0x4)
+/* Get/Set file object info. */
+#define SHFL_INFO_FILE         (0x8)
+/* Get volume information. */
+#define SHFL_INFO_VOLUME       (0x10)
+
+/** SHFL_FN_INFORMATION Parameters structure. */
+struct shfl_information {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * value64, in:
+	 * SHFLHANDLE (u64) of object to be listed.
+	 */
+	struct vmmdev_hgcm_function_parameter handle;
+
+	/**
+	 * value32, in:
+	 * SHFL_INFO_*
+	 */
+	struct vmmdev_hgcm_function_parameter flags;
+
+	/**
+	 * value32, in/out:
+	 * Bytes to be used for information/How many bytes were used.
+	 */
+	struct vmmdev_hgcm_function_parameter cb;
+
+	/**
+	 * pointer, in/out:
+	 * Information to be set/get (shfl_fsobjinfo or shfl_string). Do not
+	 * forget to set the shfl_fsobjinfo::attr::additional for a get
+	 * operation as well.
+	 */
+	struct vmmdev_hgcm_function_parameter info;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_INFORMATION (5)
+
+
+/* SHFL_FN_REMOVE */
+
+#define SHFL_REMOVE_FILE        (0x1)
+#define SHFL_REMOVE_DIR         (0x2)
+#define SHFL_REMOVE_SYMLINK     (0x4)
+
+/** SHFL_FN_REMOVE Parameters structure. */
+struct shfl_remove {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * pointer, in:
+	 * Points to struct shfl_string buffer.
+	 */
+	struct vmmdev_hgcm_function_parameter path;
+
+	/**
+	 * value32, in:
+	 * remove flags (file/directory)
+	 */
+	struct vmmdev_hgcm_function_parameter flags;
+
+};
+
+#define SHFL_CPARMS_REMOVE  (3)
+
+
+/* SHFL_FN_RENAME */
+
+#define SHFL_RENAME_FILE                (0x1)
+#define SHFL_RENAME_DIR                 (0x2)
+#define SHFL_RENAME_REPLACE_IF_EXISTS   (0x4)
+
+/** SHFL_FN_RENAME Parameters structure. */
+struct shfl_rename {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * pointer, in:
+	 * Points to struct shfl_string src.
+	 */
+	struct vmmdev_hgcm_function_parameter src;
+
+	/**
+	 * pointer, in:
+	 * Points to struct shfl_string dest.
+	 */
+	struct vmmdev_hgcm_function_parameter dest;
+
+	/**
+	 * value32, in:
+	 * rename flags (file/directory)
+	 */
+	struct vmmdev_hgcm_function_parameter flags;
+
+};
+
+#define SHFL_CPARMS_RENAME  (4)
+
+
+/** SHFL_FN_SYMLINK Parameters structure. */
+struct shfl_symlink {
+	/**
+	 * pointer, in: SHFLROOT (u32)
+	 * Root handle of the mapping which name is queried.
+	 */
+	struct vmmdev_hgcm_function_parameter root;
+
+	/**
+	 * pointer, in:
+	 * Points to struct shfl_string of path for the new symlink.
+	 */
+	struct vmmdev_hgcm_function_parameter new_path;
+
+	/**
+	 * pointer, in:
+	 * Points to struct shfl_string of destination for symlink.
+	 */
+	struct vmmdev_hgcm_function_parameter old_path;
+
+	/**
+	 * pointer, out:
+	 * Information about created symlink.
+	 */
+	struct vmmdev_hgcm_function_parameter info;
+
+};
+
+#define SHFL_CPARMS_SYMLINK  (4)
+
+#endif
diff --git a/fs/vboxsf/super.c b/fs/vboxsf/super.c
new file mode 100644
index 000000000000..0de37cb56f29
--- /dev/null
+++ b/fs/vboxsf/super.c
@@ -0,0 +1,430 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VirtualBox Guest Shared Folders support: Virtual File System.
+ *
+ * Module initialization/finalization
+ * File system registration/deregistration
+ * Superblock reading
+ * Few utility functions
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/magic.h>
+#include <linux/module.h>
+#include <linux/nls.h>
+#include <linux/statfs.h>
+#include <linux/vbox_utils.h>
+#include <linux/vbsfmount.h>
+#include "vfsmod.h"
+
+MODULE_DESCRIPTION("Oracle VM VirtualBox Module for Host File System Access");
+MODULE_AUTHOR("Oracle Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_FS("vboxsf");
+
+static struct super_operations sf_super_ops; /* forward declaration */
+static struct kmem_cache *sf_inode_cachep;
+
+/* allocate global info, try to map host share */
+static int sf_glob_alloc(struct vbsf_mount_info_new *info,
+			 struct sf_glob_info **sf_gp)
+{
+	size_t name_len, str_len;
+	struct sf_glob_info *sf_g;
+	struct shfl_string *str_name = NULL;
+#ifdef CONFIG_NLS_DEFAULT
+	const char *nls_name = CONFIG_NLS_DEFAULT;
+#else
+	const char *nls_name = "";
+#endif
+	int err;
+
+	if (info->nullchar != '\0' ||
+	    info->signature[0] != VBSF_MOUNT_SIGNATURE_BYTE_0 ||
+	    info->signature[1] != VBSF_MOUNT_SIGNATURE_BYTE_1 ||
+	    info->signature[2] != VBSF_MOUNT_SIGNATURE_BYTE_2)
+		return -EINVAL;
+
+	sf_g = kzalloc(sizeof(*sf_g), GFP_KERNEL);
+	if (!sf_g)
+		return -ENOMEM;
+
+	info->name[sizeof(info->name) - 1] = 0;
+	info->nls_name[sizeof(info->nls_name) - 1] = 0;
+
+	name_len = strlen(info->name);
+	str_len = offsetof(struct shfl_string, string.utf8) + name_len + 1;
+
+	str_name = kmalloc(str_len, GFP_KERNEL);
+	if (!str_name) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	str_name->length = name_len;
+	str_name->size = name_len + 1;
+	memcpy(str_name->string.utf8, info->name, name_len + 1);
+
+	if (info->nls_name[0])
+		nls_name = info->nls_name;
+
+	/* Load nls if not utf8 */
+	if (nls_name[0] && strcmp(nls_name, "utf8") != 0) {
+		sf_g->nls = load_nls(info->nls_name);
+		if (!sf_g->nls) {
+			err = -EINVAL;
+			goto fail;
+		}
+	} else {
+		sf_g->nls = NULL;
+	}
+
+	err = vboxsf_map_folder(str_name, &sf_g->root);
+	if (err)
+		goto fail;
+
+	kfree(str_name);
+
+	sf_g->ttl = info->ttl;
+	sf_g->uid = info->uid;
+	sf_g->gid = info->gid;
+
+	if ((size_t)info->length >= sizeof(struct vbsf_mount_info_new)) {
+		/* new fields */
+		sf_g->dmode = info->dmode;
+		sf_g->fmode = info->fmode;
+		sf_g->dmask = info->dmask;
+		sf_g->fmask = info->fmask;
+	} else {
+		sf_g->dmode = ~0;
+		sf_g->fmode = ~0;
+	}
+
+	*sf_gp = sf_g;
+	return 0;
+
+fail:
+	if (sf_g->nls)
+		unload_nls(sf_g->nls);
+
+	kfree(str_name);
+	kfree(sf_g);
+
+	return err;
+}
+
+/* unmap the share and free global info [sf_g] */
+static void sf_glob_free(struct sf_glob_info *sf_g)
+{
+	vboxsf_unmap_folder(sf_g->root);
+
+	if (sf_g->nls)
+		unload_nls(sf_g->nls);
+
+	kfree(sf_g);
+}
+
+/*
+ * This is called when vfs mounts the fs and wants to read the super_block.
+ *
+ * calls [sf_glob_alloc] to map the folder and allocate global
+ * information structure.
+ *
+ * initializes [sb], initializes root inode and dentry.
+ *
+ * should respect [flags]
+ */
+static int sf_read_super(struct super_block *sb, void *data, int flags)
+{
+	struct vbsf_mount_info_new *info = data;
+	struct shfl_string *path = NULL;
+	struct shfl_fsobjinfo fsinfo;
+	struct sf_glob_info *sf_g;
+	struct dentry *droot;
+	struct inode *iroot;
+	int err;
+
+	if (!info)
+		return -EINVAL;
+
+	if (flags & MS_REMOUNT)
+		return -EINVAL;
+
+	err = sf_glob_alloc(info, &sf_g);
+	if (err)
+		return err;
+
+	path = kmalloc(SHFLSTRING_HEADER_SIZE + 2, GFP_KERNEL);
+	if (!path) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	path->length = 1;
+	path->size = 2;
+	path->string.utf8[0] = '/';
+	path->string.utf8[1] = 0;
+
+	err = sf_stat(__func__, sf_g, path, &fsinfo, 0);
+	if (err)
+		goto fail;
+
+	sb->s_magic = 0xface;
+	sb->s_blocksize = 1024;
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+	sb->s_op = &sf_super_ops;
+
+	iroot = iget_locked(sb, 0);
+	if (!iroot) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	GET_INODE_INFO(iroot)->path = path;
+	sf_init_inode(sf_g, iroot, &fsinfo);
+	unlock_new_inode(iroot);
+
+	droot = d_make_root(iroot);
+	if (!droot) {
+		err = -ENOMEM;
+		goto fail;
+	}
+
+	sb->s_root = droot;
+	SET_GLOB_INFO(sb, sf_g);
+	return 0;
+
+fail:
+	kfree(path);
+	sf_glob_free(sf_g);
+	return err;
+}
+
+static void sf_inode_init_once(void *data)
+{
+	struct sf_inode_info *sf_i = (struct sf_inode_info *)data;
+
+	inode_init_once(&sf_i->vfs_inode);
+}
+
+static struct inode *sf_alloc_inode(struct super_block *sb)
+{
+	struct sf_inode_info *sf_i;
+
+	sf_i = kmem_cache_alloc(sf_inode_cachep, GFP_NOFS);
+	if (!sf_i)
+		return NULL;
+
+	sf_i->path = NULL;
+	sf_i->force_restat = 0;
+	sf_i->force_reread = 0;
+	sf_i->file = NULL;
+	sf_i->handle = SHFL_HANDLE_NIL;
+
+	return &sf_i->vfs_inode;
+}
+
+static void sf_i_callback(struct rcu_head *head)
+{
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	kmem_cache_free(sf_inode_cachep, GET_INODE_INFO(inode));
+}
+
+static void sf_destroy_inode(struct inode *inode)
+{
+	call_rcu(&inode->i_rcu, sf_i_callback);
+}
+
+/*
+ * This is called when vfs is about to destroy the [inode]. all
+ * resources associated with this [inode] must be cleared here.
+ */
+static void sf_evict_inode(struct inode *inode)
+{
+	truncate_inode_pages_final(&inode->i_data);
+	clear_inode(inode);
+	kfree(GET_INODE_INFO(inode)->path);
+}
+
+/*
+ * vfs is done with [sb] (umount called) call [sf_glob_free] to unmap
+ * the folder and free [sf_g]
+ */
+static void sf_put_super(struct super_block *sb)
+{
+	struct sf_glob_info *sf_g;
+
+	sf_g = GET_GLOB_INFO(sb);
+	sf_glob_free(sf_g);
+}
+
+static int sf_statfs(struct dentry *dentry, struct kstatfs *stat)
+{
+	struct super_block *sb = dentry->d_inode->i_sb;
+	struct sf_glob_info *sf_g;
+	struct shfl_volinfo SHFLVolumeInfo;
+	u32 buf_len;
+	int err;
+
+	sf_g = GET_GLOB_INFO(sb);
+	buf_len = sizeof(SHFLVolumeInfo);
+	err = vboxsf_fsinfo(sf_g->root, 0, SHFL_INFO_GET | SHFL_INFO_VOLUME,
+			    &buf_len, &SHFLVolumeInfo);
+	if (err)
+		return err;
+
+	stat->f_type = NFS_SUPER_MAGIC;	/* XXX vboxsf type? */
+	stat->f_bsize = SHFLVolumeInfo.bytes_per_allocation_unit;
+
+	do_div(SHFLVolumeInfo.total_allocation_bytes,
+	       SHFLVolumeInfo.bytes_per_allocation_unit);
+	stat->f_blocks = SHFLVolumeInfo.total_allocation_bytes;
+
+	do_div(SHFLVolumeInfo.available_allocation_bytes,
+	       SHFLVolumeInfo.bytes_per_allocation_unit);
+	stat->f_bfree  = SHFLVolumeInfo.available_allocation_bytes;
+	stat->f_bavail = SHFLVolumeInfo.available_allocation_bytes;
+
+	stat->f_files = 1000;
+	/*
+	 * Don't return 0 here since the guest may then think that it is not
+	 * possible to create any more files.
+	 */
+	stat->f_ffree = 1000;
+	stat->f_fsid.val[0] = 0;
+	stat->f_fsid.val[1] = 0;
+	stat->f_namelen = 255;
+	return 0;
+}
+
+static int sf_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+	struct sf_glob_info *sf_g;
+	struct sf_inode_info *sf_i;
+	struct inode *iroot;
+	struct shfl_fsobjinfo fsinfo;
+	int err;
+
+	sf_g = GET_GLOB_INFO(sb);
+	if (data && data[0] != 0) {
+		struct vbsf_mount_info_new *info =
+		    (struct vbsf_mount_info_new *)data;
+		if (info->signature[0] == VBSF_MOUNT_SIGNATURE_BYTE_0
+		    && info->signature[1] == VBSF_MOUNT_SIGNATURE_BYTE_1
+		    && info->signature[2] == VBSF_MOUNT_SIGNATURE_BYTE_2) {
+			sf_g->uid = info->uid;
+			sf_g->gid = info->gid;
+			sf_g->ttl = info->ttl;
+			sf_g->dmode = info->dmode;
+			sf_g->fmode = info->fmode;
+			sf_g->dmask = info->dmask;
+			sf_g->fmask = info->fmask;
+		}
+	}
+
+	iroot = ilookup(sb, 0);
+	if (!iroot)
+		return -ENOENT;
+
+	sf_i = GET_INODE_INFO(iroot);
+	err = sf_stat(__func__, sf_g, sf_i->path, &fsinfo, 0);
+	if (err == 0)
+		sf_init_inode(sf_g, iroot, &fsinfo);
+	else
+		vbg_warn("Error statting root fs after remount: %d\n", err);
+
+	return 0;
+}
+
+static struct super_operations sf_super_ops = {
+	.alloc_inode	= sf_alloc_inode,
+	.destroy_inode	= sf_destroy_inode,
+	.evict_inode	= sf_evict_inode,
+	.put_super	= sf_put_super,
+	.statfs		= sf_statfs,
+	.remount_fs	= sf_remount_fs
+};
+
+static struct dentry *sf_mount(struct file_system_type *fs_type, int flags,
+			       const char *dev_name, void *data)
+{
+	return mount_nodev(fs_type, flags, data, sf_read_super);
+}
+
+static struct file_system_type vboxsf_fs_type = {
+	.owner = THIS_MODULE,
+	.name = "vboxsf",
+	.mount = sf_mount,
+	.kill_sb = kill_anon_super
+};
+
+static int follow_symlinks;
+module_param(follow_symlinks, int, 0444);
+MODULE_PARM_DESC(follow_symlinks,
+		 "Let host resolve symlinks rather than showing them");
+
+/* Module initialization/finalization handlers */
+static int __init init(void)
+{
+	int err;
+
+	if (sizeof(struct vbsf_mount_info_new) > PAGE_SIZE) {
+		vbg_err("vboxsf: Mount information structure is too large %zd; Must be less than or equal to %ld\n",
+			sizeof(struct vbsf_mount_info_new), PAGE_SIZE);
+		return -EINVAL;
+	}
+
+	sf_inode_cachep = kmem_cache_create("vboxsf_inode_cache",
+					     sizeof(struct sf_inode_info),
+					     0, (SLAB_RECLAIM_ACCOUNT|
+						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+					     sf_inode_init_once);
+	if (sf_inode_cachep == NULL)
+		return -ENOMEM;
+
+	err = register_filesystem(&vboxsf_fs_type);
+	if (err)
+		return err;
+
+	err = vboxsf_connect();
+	if (err) {
+		vbg_err("vboxsf_connect error %d\n", err);
+		goto fail_unregisterfs;
+	}
+
+	err = vboxsf_set_utf8();
+	if (err) {
+		vbg_err("vboxsf_setutf8 error %d\n", err);
+		goto fail_disconnect;
+	}
+
+	if (!follow_symlinks) {
+		err = vboxsf_set_symlinks();
+		if (err)
+			vbg_warn("vboxsf: Unable to show symlinks: %d\n", err);
+	}
+
+	return 0;
+
+fail_disconnect:
+	vboxsf_disconnect();
+fail_unregisterfs:
+	unregister_filesystem(&vboxsf_fs_type);
+	return err;
+}
+
+static void __exit fini(void)
+{
+	vboxsf_disconnect();
+	unregister_filesystem(&vboxsf_fs_type);
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(sf_inode_cachep);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/fs/vboxsf/utils.c b/fs/vboxsf/utils.c
new file mode 100644
index 000000000000..9d457d0ac001
--- /dev/null
+++ b/fs/vboxsf/utils.c
@@ -0,0 +1,589 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VirtualBox Guest Shared Folders support: Utility functions.
+ * Mainly conversion from/to VirtualBox/Linux data structures.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/namei.h>
+#include <linux/nls.h>
+#include <linux/sizes.h>
+#include <linux/vfs.h>
+#include "vfsmod.h"
+
+/*
+ * sf_reg_aops and sf_backing_dev_info are just quick implementations to make
+ * sendfile work. For more information have a look at
+ *
+ *   http://us1.samba.org/samba/ftp/cifs-cvs/ols2006-fs-tutorial-smf.odp
+ *
+ * and the sample implementation
+ *
+ *   http://pserver.samba.org/samba/ftp/cifs-cvs/samplefs.tar.gz
+ */
+
+static void sf_timespec_from_vbox(struct timespec *tv,
+				  const struct shfl_timespec *ts)
+{
+	s64 nsec, t = ts->ns_relative_to_unix_epoch;
+
+	nsec = do_div(t, 1000000000);
+	tv->tv_sec = t;
+	tv->tv_nsec = nsec;
+}
+
+static void sf_timespec_to_vbox(struct shfl_timespec *ts,
+				const struct timespec *tv)
+{
+	s64 t = (s64) tv->tv_nsec + (s64) tv->tv_sec * 1000000000;
+
+	ts->ns_relative_to_unix_epoch = t;
+}
+
+/* set [inode] attributes based on [info], uid/gid based on [sf_g] */
+void sf_init_inode(struct sf_glob_info *sf_g, struct inode *inode,
+		   const struct shfl_fsobjinfo *info)
+{
+	const struct shfl_fsobjattr *attr;
+	s64 allocated;
+	int mode;
+
+	attr = &info->attr;
+
+#define mode_set(r) ((attr->mode & (SHFL_UNIX_##r)) ? (S_##r) : 0)
+
+	mode = mode_set(ISUID);
+	mode |= mode_set(ISGID);
+
+	mode |= mode_set(IRUSR);
+	mode |= mode_set(IWUSR);
+	mode |= mode_set(IXUSR);
+
+	mode |= mode_set(IRGRP);
+	mode |= mode_set(IWGRP);
+	mode |= mode_set(IXGRP);
+
+	mode |= mode_set(IROTH);
+	mode |= mode_set(IWOTH);
+	mode |= mode_set(IXOTH);
+
+#undef mode_set
+
+	inode->i_mapping->a_ops = &sf_reg_aops;
+
+	if (SHFL_IS_DIRECTORY(attr->mode)) {
+		inode->i_mode = sf_g->dmode != ~0 ? (sf_g->dmode & 0777) : mode;
+		inode->i_mode &= ~sf_g->dmask;
+		inode->i_mode |= S_IFDIR;
+		inode->i_op = &sf_dir_iops;
+		inode->i_fop = &sf_dir_fops;
+		/*
+		 * XXX: this probably should be set to the number of entries
+		 * in the directory plus two (. ..)
+		 */
+		set_nlink(inode, 1);
+	} else if (SHFL_IS_SYMLINK(attr->mode)) {
+		inode->i_mode = sf_g->fmode != ~0 ? (sf_g->fmode & 0777) : mode;
+		inode->i_mode &= ~sf_g->fmask;
+		inode->i_mode |= S_IFLNK;
+		inode->i_op = &sf_lnk_iops;
+		set_nlink(inode, 1);
+	} else {
+		inode->i_mode = sf_g->fmode != ~0 ? (sf_g->fmode & 0777) : mode;
+		inode->i_mode &= ~sf_g->fmask;
+		inode->i_mode |= S_IFREG;
+		inode->i_op = &sf_reg_iops;
+		inode->i_fop = &sf_reg_fops;
+		set_nlink(inode, 1);
+	}
+
+	inode->i_uid = make_kuid(current_user_ns(), sf_g->uid);
+	inode->i_gid = make_kgid(current_user_ns(), sf_g->gid);
+
+	inode->i_size = info->size;
+	inode->i_blkbits = 12;
+	/* i_blocks always in units of 512 bytes! */
+	allocated = info->allocated + 511;
+	do_div(allocated, 512);
+	inode->i_blocks = allocated;
+
+	sf_timespec_from_vbox(&inode->i_atime, &info->access_time);
+	sf_timespec_from_vbox(&inode->i_ctime, &info->change_time);
+	sf_timespec_from_vbox(&inode->i_mtime, &info->modification_time);
+}
+
+int sf_stat(const char *caller, struct sf_glob_info *sf_g,
+	    struct shfl_string *path, struct shfl_fsobjinfo *result,
+	    int ok_to_fail)
+{
+	struct shfl_createparms params = {};
+	int err;
+
+	params.handle = SHFL_HANDLE_NIL;
+	params.create_flags = SHFL_CF_LOOKUP | SHFL_CF_ACT_FAIL_IF_NEW;
+
+	err = vboxsf_create(sf_g->root, path, &params);
+	if (err)
+		return err;
+
+	if (params.result != SHFL_FILE_EXISTS)
+		return -ENOENT;
+
+	*result = params.info;
+	return 0;
+}
+
+/*
+ * This is called indirectly as iop through [sf_getattr]. The job is to find
+ * out whether dentry/inode is still valid. the test is failed if [dentry]
+ * does not have an inode or [sf_stat] is unsuccessful, otherwise we return
+ * success and update inode attributes.
+ */
+int sf_inode_revalidate(struct dentry *dentry)
+{
+	int err;
+	struct sf_glob_info *sf_g;
+	struct sf_inode_info *sf_i;
+	struct shfl_fsobjinfo info;
+
+	if (!dentry || !dentry->d_inode)
+		return -EINVAL;
+
+	sf_g = GET_GLOB_INFO(dentry->d_inode->i_sb);
+	sf_i = GET_INODE_INFO(dentry->d_inode);
+
+	if (!sf_i->force_restat) {
+		if (time_before(jiffies, dentry->d_time + sf_g->ttl))
+			return 0;
+	}
+
+	err = sf_stat(__func__, sf_g, sf_i->path, &info, 1);
+	if (err)
+		return err;
+
+	dentry->d_time = jiffies;
+	sf_i->force_restat = 0;
+	sf_init_inode(sf_g, dentry->d_inode, &info);
+	return 0;
+}
+
+int sf_getattr(const struct path *path, struct kstat *kstat, u32 request_mask,
+	       unsigned int flags)
+{
+	int err;
+	struct dentry *dentry = path->dentry;
+
+	err = sf_inode_revalidate(dentry);
+	if (err)
+		return err;
+
+	generic_fillattr(dentry->d_inode, kstat);
+	return 0;
+}
+
+int sf_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+	struct sf_glob_info *sf_g;
+	struct sf_inode_info *sf_i;
+	struct shfl_createparms params = {};
+	struct shfl_fsobjinfo info = {};
+	uint32_t buf_len;
+	int err;
+
+	sf_g = GET_GLOB_INFO(dentry->d_inode->i_sb);
+	sf_i = GET_INODE_INFO(dentry->d_inode);
+
+	params.handle = SHFL_HANDLE_NIL;
+	params.create_flags = SHFL_CF_ACT_OPEN_IF_EXISTS
+	    | SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_ATTR_WRITE;
+
+	/* this is at least required for Posix hosts */
+	if (iattr->ia_valid & ATTR_SIZE)
+		params.create_flags |= SHFL_CF_ACCESS_WRITE;
+
+	err = vboxsf_create(sf_g->root, sf_i->path, &params);
+	if (err)
+		return err;
+
+	if (params.result != SHFL_FILE_EXISTS)
+		return -ENOENT;
+
+#define mode_set(r) ((iattr->ia_mode & (S_##r)) ? SHFL_UNIX_##r : 0)
+
+	/*
+	 * Setting the file size and setting the other attributes has to
+	 * be handled separately.
+	 */
+	if (iattr->ia_valid & (ATTR_MODE | ATTR_ATIME | ATTR_MTIME)) {
+		if (iattr->ia_valid & ATTR_MODE) {
+			info.attr.mode = mode_set(ISUID);
+			info.attr.mode |= mode_set(ISGID);
+			info.attr.mode |= mode_set(IRUSR);
+			info.attr.mode |= mode_set(IWUSR);
+			info.attr.mode |= mode_set(IXUSR);
+			info.attr.mode |= mode_set(IRGRP);
+			info.attr.mode |= mode_set(IWGRP);
+			info.attr.mode |= mode_set(IXGRP);
+			info.attr.mode |= mode_set(IROTH);
+			info.attr.mode |= mode_set(IWOTH);
+			info.attr.mode |= mode_set(IXOTH);
+
+			if (iattr->ia_mode & S_IFDIR)
+				info.attr.mode |= SHFL_TYPE_DIRECTORY;
+			else
+				info.attr.mode |= SHFL_TYPE_FILE;
+		}
+
+		if (iattr->ia_valid & ATTR_ATIME)
+			sf_timespec_to_vbox(&info.access_time,
+					    &iattr->ia_atime);
+
+		if (iattr->ia_valid & ATTR_MTIME)
+			sf_timespec_to_vbox(&info.modification_time,
+					    &iattr->ia_mtime);
+
+		/*
+		 * Ignore ctime (inode change time) as it can't be set
+		 * from userland anyway.
+		 */
+
+		buf_len = sizeof(info);
+		err = vboxsf_fsinfo(sf_g->root, params.handle,
+				   SHFL_INFO_SET | SHFL_INFO_FILE, &buf_len,
+				   &info);
+		if (err)
+			goto out;
+	}
+
+#undef mode_set
+
+	if (iattr->ia_valid & ATTR_SIZE) {
+		memset(&info, 0, sizeof(info));
+		info.size = iattr->ia_size;
+		buf_len = sizeof(info);
+		err = vboxsf_fsinfo(sf_g->root, params.handle,
+				   SHFL_INFO_SET | SHFL_INFO_SIZE, &buf_len,
+				   &info);
+		if (err)
+			goto out;
+	}
+
+	err = sf_inode_revalidate(dentry);
+out:
+	vboxsf_close(sf_g->root, params.handle);
+	return err;
+}
+
+static int sf_make_path(const char *caller, struct sf_inode_info *sf_i,
+			const char *d_name, size_t d_len,
+			struct shfl_string **result)
+{
+	size_t path_len, shflstring_len;
+	struct shfl_string *tmp;
+	uint16_t p_len;
+	uint8_t *p_name;
+	int fRoot = 0;
+
+	p_len = sf_i->path->length;
+	p_name = sf_i->path->string.utf8;
+
+	if (p_len == 1 && *p_name == '/') {
+		path_len = d_len + 1;
+		fRoot = 1;
+	} else {
+		/* lengths of constituents plus terminating zero plus slash  */
+		path_len = p_len + d_len + 2;
+		if (path_len > 0xffff)
+			return -ENAMETOOLONG;
+	}
+
+	shflstring_len = offsetof(struct shfl_string, string.utf8) + path_len;
+	tmp = kmalloc(shflstring_len, GFP_KERNEL);
+	if (!tmp)
+		return -ENOMEM;
+
+	tmp->length = path_len - 1;
+	tmp->size = path_len;
+
+	if (fRoot)
+		memcpy(&tmp->string.utf8[0], d_name, d_len + 1);
+	else {
+		memcpy(&tmp->string.utf8[0], p_name, p_len);
+		tmp->string.utf8[p_len] = '/';
+		memcpy(&tmp->string.utf8[p_len + 1], d_name, d_len);
+		tmp->string.utf8[p_len + 1 + d_len] = '\0';
+	}
+
+	*result = tmp;
+	return 0;
+}
+
+/*
+ * [dentry] contains string encoded in coding system that corresponds
+ * to [sf_g]->nls, we must convert it to UTF8 here and pass down to
+ * [sf_make_path] which will allocate struct shfl_string and fill it in
+ */
+int sf_path_from_dentry(const char *caller, struct sf_glob_info *sf_g,
+			struct sf_inode_info *sf_i, struct dentry *dentry,
+			struct shfl_string **result)
+{
+	int err;
+	const char *d_name;
+	size_t d_len;
+	const char *name;
+	size_t len = 0;
+
+	d_name = dentry->d_name.name;
+	d_len = dentry->d_name.len;
+
+	if (sf_g->nls) {
+		size_t in_len, i, out_bound_len;
+		const char *in;
+		char *out;
+
+		in = d_name;
+		in_len = d_len;
+
+		out_bound_len = PATH_MAX;
+		out = kmalloc(out_bound_len, GFP_KERNEL);
+		name = out;
+
+		for (i = 0; i < d_len; ++i) {
+			wchar_t uni;
+			int nb;
+
+			nb = sf_g->nls->char2uni(in, in_len, &uni);
+			if (nb < 0) {
+				err = -EINVAL;
+				goto fail;
+			}
+			in_len -= nb;
+			in += nb;
+
+			nb = utf32_to_utf8(uni, out, out_bound_len);
+			if (nb < 0) {
+				err = -EINVAL;
+				goto fail;
+			}
+			out_bound_len -= nb;
+			out += nb;
+			len += nb;
+		}
+		if (len >= PATH_MAX - 1) {
+			err = -ENAMETOOLONG;
+			goto fail;
+		}
+
+		*out = 0;
+	} else {
+		name = d_name;
+		len = d_len;
+	}
+
+	err = sf_make_path(caller, sf_i, name, len, result);
+	if (name != d_name)
+		kfree(name);
+
+	return err;
+
+fail:
+	kfree(name);
+	return err;
+}
+
+int sf_nlscpy(struct sf_glob_info *sf_g,
+	      char *name, size_t name_bound_len,
+	      const unsigned char *utf8_name, size_t utf8_len)
+{
+	if (sf_g->nls) {
+		const char *in;
+		char *out;
+		size_t out_len;
+		size_t out_bound_len;
+		size_t in_bound_len;
+
+		in = utf8_name;
+		in_bound_len = utf8_len;
+
+		out = name;
+		out_len = 0;
+		out_bound_len = name_bound_len;
+
+		while (in_bound_len) {
+			int nb;
+			unicode_t uni;
+
+			nb = utf8_to_utf32(in, in_bound_len, &uni);
+			if (nb < 0)
+				return -EINVAL;
+
+			in += nb;
+			in_bound_len -= nb;
+
+			nb = sf_g->nls->uni2char(uni, out, out_bound_len);
+			if (nb < 0)
+				return nb;
+
+			out += nb;
+			out_bound_len -= nb;
+			out_len += nb;
+		}
+
+		*out = 0;
+	} else {
+		if (utf8_len + 1 > name_bound_len)
+			return -ENAMETOOLONG;
+
+		memcpy(name, utf8_name, utf8_len + 1);
+	}
+	return 0;
+}
+
+static struct sf_dir_buf *sf_dir_buf_alloc(void)
+{
+	struct sf_dir_buf *b;
+
+	b = kmalloc(sizeof(*b), GFP_KERNEL);
+	if (!b)
+		return NULL;
+
+	b->buf = kmalloc(DIR_BUFFER_SIZE, GFP_KERNEL);
+	if (!b->buf) {
+		kfree(b);
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&b->head);
+	b->entries = 0;
+	b->used = 0;
+	b->free = DIR_BUFFER_SIZE;
+
+	return b;
+}
+
+static void sf_dir_buf_free(struct sf_dir_buf *b)
+{
+	list_del(&b->head);
+	kfree(b->buf);
+	kfree(b);
+}
+
+/**
+ * Free the directory buffer.
+ * @p		sf_dir_info buffer to free
+ */
+void sf_dir_info_free(struct sf_dir_info *p)
+{
+	struct list_head *list, *pos, *tmp;
+
+	list = &p->info_list;
+	list_for_each_safe(pos, tmp, list) {
+		struct sf_dir_buf *b;
+
+		b = list_entry(pos, struct sf_dir_buf, head);
+		sf_dir_buf_free(b);
+	}
+	kfree(p);
+}
+
+/**
+ * Empty (but not free) the directory buffer.
+ * @p		sf_dir_info buffer to empty
+ */
+void sf_dir_info_empty(struct sf_dir_info *p)
+{
+	struct list_head *list, *pos, *tmp;
+	struct sf_dir_buf *b;
+
+	list = &p->info_list;
+	list_for_each_safe(pos, tmp, list) {
+		b = list_entry(pos, struct sf_dir_buf, head);
+		b->entries = 0;
+		b->used = 0;
+		b->free = DIR_BUFFER_SIZE;
+	}
+}
+
+/**
+ * Create a new directory buffer descriptor.
+ * Return: Created sf_dir_info buffer, or NULL when malloc fails
+ */
+struct sf_dir_info *sf_dir_info_alloc(void)
+{
+	struct sf_dir_info *p;
+
+	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return NULL;
+
+	INIT_LIST_HEAD(&p->info_list);
+	return p;
+}
+
+/* Search for an empty directory content buffer. */
+static struct sf_dir_buf *sf_get_empty_dir_buf(struct sf_dir_info *sf_d)
+{
+	struct list_head *list, *pos;
+
+	list = &sf_d->info_list;
+	list_for_each(pos, list) {
+		struct sf_dir_buf *b;
+
+		b = list_entry(pos, struct sf_dir_buf, head);
+		if (!b)
+			return NULL;
+
+		if (b->used == 0)
+			return b;
+	}
+
+	return NULL;
+}
+
+int sf_dir_read_all(struct sf_glob_info *sf_g, struct sf_inode_info *sf_i,
+		    struct sf_dir_info *sf_d, u64 handle)
+{
+	struct shfl_string *mask;
+	struct sf_dir_buf *b;
+	u32 entries, size;
+	void *buf;
+	int err;
+
+	err = sf_make_path(__func__, sf_i, "*", 1, &mask);
+	if (err)
+		return err;
+
+	/* vboxsf_dirinfo returns 1 on end of dir */
+	while (err == 0) {
+		b = sf_get_empty_dir_buf(sf_d);
+		if (!b) {
+			b = sf_dir_buf_alloc();
+			if (!b) {
+				err = -ENOMEM;
+				break;
+			}
+			list_add(&b->head, &sf_d->info_list);
+		}
+
+		buf = b->buf;
+		size = b->free;
+
+		err = vboxsf_dirinfo(sf_g->root, handle, mask, 0, 0,
+				     &size, buf, &entries);
+		if (err < 0)
+			break;
+
+		b->entries += entries;
+		b->free -= size;
+		b->used += size;
+	}
+
+	kfree(mask);
+
+	/* -EILSEQ means the host could not translate a filename, ignore */
+	if (err > 0 || err == -EILSEQ)
+		err = 0;
+
+	return err;
+}
diff --git a/fs/vboxsf/vboxsf_wrappers.c b/fs/vboxsf/vboxsf_wrappers.c
new file mode 100644
index 000000000000..3781ac466609
--- /dev/null
+++ b/fs/vboxsf/vboxsf_wrappers.c
@@ -0,0 +1,365 @@
+// SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0)
+/*
+ * Wrapper functions for the shfl host calls.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vbox_err.h>
+#include <linux/vbox_utils.h>
+#include "vboxsf_wrappers.h"
+
+static u32 vboxsf_client_id;
+
+int vboxsf_connect(void)
+{
+	struct vbg_dev *gdev;
+	struct vmmdev_hgcm_service_location loc;
+	int err, vbox_status;
+
+	loc.type = VMMDEV_HGCM_LOC_LOCALHOST_EXISTING;
+	strcpy(loc.u.localhost.service_name, "VBoxSharedFolders");
+
+	gdev = vbg_get_gdev();
+	if (IS_ERR(gdev))
+		return VERR_NOT_SUPPORTED;	/* No guest-device */
+
+	err = vbg_hgcm_connect(gdev, &loc, &vboxsf_client_id, &vbox_status);
+	vbg_put_gdev(gdev);
+
+	return err ? err : vbg_status_code_to_errno(vbox_status);
+}
+
+void vboxsf_disconnect(void)
+{
+	struct vbg_dev *gdev;
+	int vbox_status;
+
+	gdev = vbg_get_gdev();
+	if (IS_ERR(gdev))
+		return;   /* guest-device is gone, already disconnected */
+
+	vbg_hgcm_disconnect(gdev, vboxsf_client_id, &vbox_status);
+	vbg_put_gdev(gdev);
+}
+
+static int vboxsf_call(u32 function, void *parms, u32 parm_count, int *status)
+{
+	struct vbg_dev *gdev;
+	int err, vbox_status;
+
+	gdev = vbg_get_gdev();
+	if (IS_ERR(gdev))
+		return VERR_DEV_IO_ERROR; /* guest-dev removed underneath us */
+
+	err = vbg_hgcm_call(gdev, vboxsf_client_id, function, U32_MAX,
+			    parms, parm_count, &vbox_status);
+	vbg_put_gdev(gdev);
+
+	if (err < 0)
+		return err;
+
+	if (status)
+		*status = vbox_status;
+
+	return vbg_status_code_to_errno(vbox_status);
+}
+
+int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root)
+{
+	struct shfl_map_folder parms;
+	int err, status;
+
+	parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
+	parms.path.u.pointer.size = shfl_string_buf_size(folder_name);
+	parms.path.u.pointer.u.linear_addr = (uintptr_t)folder_name;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = 0;
+
+	parms.delimiter.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.delimiter.u.value32 = '/';
+
+	parms.case_sensitive.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.case_sensitive.u.value32 = 1;
+
+	err = vboxsf_call(SHFL_FN_MAP_FOLDER, &parms, SHFL_CPARMS_MAP_FOLDER,
+			  &status);
+	if (err == -ENOSYS && status == VERR_NOT_IMPLEMENTED)
+		vbg_err("%s: Error host is too old\n", __func__);
+
+	*root = parms.root.u.value32;
+	return err;
+}
+
+int vboxsf_unmap_folder(u32 root)
+{
+	struct shfl_unmap_folder parms;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	return vboxsf_call(SHFL_FN_UNMAP_FOLDER, &parms,
+			   SHFL_CPARMS_UNMAP_FOLDER, NULL);
+}
+
+/**
+ * Create a new file or folder or open an existing one in a shared folder.
+ * Note this function always returns 0 / success unless an exceptional condition
+ * occurs - out of memory, invalid arguments, etc. If the file or folder could
+ * not be opened or created, create_parms->handle will be set to
+ * SHFL_HANDLE_NIL on return.  In this case the value in create_parms->result
+ * provides information as to why (e.g. SHFL_FILE_EXISTS), create_parms->result
+ * is also set on success as additional information.
+ * Return: 0 or negative errno value.
+ * @root	Root of the shared folder in which to create the file
+ * @parsed_path	The path of the file or folder relative to the shared folder
+ * @param	create_parms Parameters for file/folder creation.
+ */
+int vboxsf_create(u32 root, struct shfl_string *parsed_path,
+		  struct shfl_createparms *create_parms)
+{
+	struct shfl_create parms;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
+	parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
+	parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
+
+	parms.parms.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
+	parms.parms.u.pointer.size = sizeof(struct shfl_createparms);
+	parms.parms.u.pointer.u.linear_addr = (uintptr_t)create_parms;
+
+	return vboxsf_call(SHFL_FN_CREATE, &parms, SHFL_CPARMS_CREATE, NULL);
+}
+
+int vboxsf_close(u32 root, u64 handle)
+{
+	struct shfl_close parms;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+	parms.handle.u.value64 = handle;
+
+	return vboxsf_call(SHFL_FN_CLOSE, &parms, SHFL_CPARMS_CLOSE, NULL);
+}
+
+int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags)
+{
+	struct shfl_remove parms;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+	parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
+	parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
+
+	parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.flags.u.value32 = flags;
+
+	return vboxsf_call(SHFL_FN_REMOVE, &parms, SHFL_CPARMS_REMOVE, NULL);
+}
+
+int vboxsf_rename(u32 root, struct shfl_string *src_path,
+		  struct shfl_string *dest_path, u32 flags)
+{
+	struct shfl_rename parms;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.src.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+	parms.src.u.pointer.size = shfl_string_buf_size(src_path);
+	parms.src.u.pointer.u.linear_addr = (uintptr_t)src_path;
+
+	parms.dest.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+	parms.dest.u.pointer.size = shfl_string_buf_size(dest_path);
+	parms.dest.u.pointer.u.linear_addr = (uintptr_t)dest_path;
+
+	parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.flags.u.value32 = flags;
+
+	return vboxsf_call(SHFL_FN_RENAME, &parms, SHFL_CPARMS_RENAME, NULL);
+}
+
+int vboxsf_read(u32 root, u64 handle, u64 offset,
+		u32 *buf_len, u8 *buf, bool user)
+{
+	struct shfl_read parms;
+	int err;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+	parms.handle.u.value64 = handle;
+	parms.offset.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+	parms.offset.u.value64 = offset;
+	parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.cb.u.value32 = *buf_len;
+	if (user)
+		parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT;
+	else
+		parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
+	parms.buffer.u.pointer.size = *buf_len;
+	parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+	err = vboxsf_call(SHFL_FN_READ, &parms, SHFL_CPARMS_READ, NULL);
+
+	*buf_len = parms.cb.u.value32;
+	return err;
+}
+
+int vboxsf_write(u32 root, u64 handle, u64 offset,
+		 u32 *buf_len, const u8 *buf, bool user)
+{
+	struct shfl_write parms;
+	int err;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+	parms.handle.u.value64 = handle;
+	parms.offset.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+	parms.offset.u.value64 = offset;
+	parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.cb.u.value32 = *buf_len;
+	if (user)
+		parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_IN;
+	else
+		parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+	parms.buffer.u.pointer.size = *buf_len;
+	parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+	err = vboxsf_call(SHFL_FN_WRITE, &parms, SHFL_CPARMS_WRITE, NULL);
+
+	*buf_len = parms.cb.u.value32;
+	return err;
+}
+
+/* Returns 0 on success, 1 on end-of-dir, negative errno otherwise */
+int vboxsf_dirinfo(u32 root, u64 handle,
+		   struct shfl_string *parsed_path, u32 flags, u32 index,
+		   u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count)
+{
+	struct shfl_list parms;
+	int err, status;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+	parms.handle.u.value64 = handle;
+	parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.flags.u.value32 = flags;
+	parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.cb.u.value32 = *buf_len;
+	parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+	parms.path.u.pointer.size =
+	    parsed_path ? shfl_string_buf_size(parsed_path) : 0;
+	parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
+
+	parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
+	parms.buffer.u.pointer.size = *buf_len;
+	parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+	parms.resume_point.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.resume_point.u.value32 = index;
+	parms.file_count.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.file_count.u.value32 = 0;	/* out parameter only */
+
+	err = vboxsf_call(SHFL_FN_LIST, &parms, SHFL_CPARMS_LIST, &status);
+	if (err == -ENODATA && status == VERR_NO_MORE_FILES)
+		err = 1;
+
+	*buf_len = parms.cb.u.value32;
+	*file_count = parms.file_count.u.value32;
+	return err;
+}
+
+int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
+		  u32 *buf_len, void *buf)
+{
+	struct shfl_information parms;
+	int err;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+	parms.handle.u.value64 = handle;
+	parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.flags.u.value32 = flags;
+	parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.cb.u.value32 = *buf_len;
+	parms.info.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
+	parms.info.u.pointer.size = *buf_len;
+	parms.info.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+	err = vboxsf_call(SHFL_FN_INFORMATION, &parms, SHFL_CPARMS_INFORMATION,
+			  NULL);
+
+	*buf_len = parms.cb.u.value32;
+	return err;
+}
+
+int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
+		    u32 buf_len, u8 *buf)
+{
+	struct shfl_readLink parms;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+	parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
+	parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
+
+	parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
+	parms.buffer.u.pointer.size = buf_len;
+	parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+	return vboxsf_call(SHFL_FN_READLINK, &parms, SHFL_CPARMS_READLINK,
+			   NULL);
+}
+
+int vboxsf_symlink(u32 root, struct shfl_string *new_path,
+		   struct shfl_string *old_path, struct shfl_fsobjinfo *buf)
+{
+	struct shfl_symlink parms;
+
+	parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+	parms.root.u.value32 = root;
+
+	parms.new_path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+	parms.new_path.u.pointer.size = shfl_string_buf_size(new_path);
+	parms.new_path.u.pointer.u.linear_addr = (uintptr_t)new_path;
+
+	parms.old_path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+	parms.old_path.u.pointer.size = shfl_string_buf_size(old_path);
+	parms.old_path.u.pointer.u.linear_addr = (uintptr_t)old_path;
+
+	parms.info.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
+	parms.info.u.pointer.size = sizeof(struct shfl_fsobjinfo);
+	parms.info.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+	return vboxsf_call(SHFL_FN_SYMLINK, &parms, SHFL_CPARMS_SYMLINK, NULL);
+}
+
+int vboxsf_set_utf8(void)
+{
+	return vboxsf_call(SHFL_FN_SET_UTF8, NULL, 0, NULL);
+}
+
+int vboxsf_set_symlinks(void)
+{
+	return vboxsf_call(SHFL_FN_SET_SYMLINKS, NULL, 0, NULL);
+}
diff --git a/fs/vboxsf/vboxsf_wrappers.h b/fs/vboxsf/vboxsf_wrappers.h
new file mode 100644
index 000000000000..9abca9aea6a9
--- /dev/null
+++ b/fs/vboxsf/vboxsf_wrappers.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */
+/*
+ * Protype declarations for the wrapper functions for the shfl host calls.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#ifndef VBOXSF_WRAPPERS_H
+#define VBOXSF_WRAPPERS_H
+
+#include "shfl_hostintf.h"
+
+int vboxsf_connect(void);
+void vboxsf_disconnect(void);
+
+int vboxsf_create(u32 root, struct shfl_string *parsed_path,
+		  struct shfl_createparms *create_parms);
+
+int vboxsf_close(u32 root, u64 handle);
+int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags);
+int vboxsf_rename(u32 root, struct shfl_string *src_path,
+		  struct shfl_string *dest_path, u32 flags);
+
+int vboxsf_read(u32 root, u64 handle, u64 offset,
+		u32 *buf_len, u8 *buf, bool user);
+int vboxsf_write(u32 root, u64 handle, u64 offset,
+		 u32 *buf_len, const u8 *buf, bool user);
+
+int vboxsf_dirinfo(u32 root, u64 handle,
+		   struct shfl_string *parsed_path, u32 flags, u32 index,
+		   u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count);
+int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
+		  u32 *buf_len, void *buf);
+
+int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root);
+int vboxsf_unmap_folder(u32 root);
+
+int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
+		    u32 buf_len, u8 *buf);
+int vboxsf_symlink(u32 root, struct shfl_string *new_path,
+		   struct shfl_string *old_path, struct shfl_fsobjinfo *buf);
+
+int vboxsf_set_utf8(void);
+int vboxsf_set_symlinks(void);
+
+#endif
diff --git a/fs/vboxsf/vfsmod.h b/fs/vboxsf/vfsmod.h
new file mode 100644
index 000000000000..29dd69aacfdc
--- /dev/null
+++ b/fs/vboxsf/vfsmod.h
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * VirtualBox Guest Shared Folders support: module header.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#ifndef VFSMOD_H
+#define VFSMOD_H
+
+#include <linux/backing-dev.h>
+#include <linux/version.h>
+#include "vboxsf_wrappers.h"
+
+#define DIR_BUFFER_SIZE SZ_16K
+
+/* The cast is to prevent assignment of void * to pointers of arbitrary type */
+#define GET_GLOB_INFO(sb)       ((struct sf_glob_info *)(sb)->s_fs_info)
+#define SET_GLOB_INFO(sb, sf_g) ((sb)->s_fs_info = (sf_g))
+#define GET_INODE_INFO(i)       container_of(i, struct sf_inode_info, vfs_inode)
+#define GET_F_DENTRY(f)         (f->f_path.dentry)
+
+/* per-shared folder information */
+struct sf_glob_info {
+	u32 root;
+	struct nls_table *nls;
+	int ttl;
+	int uid;
+	int gid;
+	int dmode;
+	int fmode;
+	int dmask;
+	int fmask;
+};
+
+/* per-inode information */
+struct sf_inode_info {
+	/* which file */
+	struct shfl_string *path;
+	/* some information was changed, update data on next revalidate */
+	int force_restat;
+	/*
+	 * directory content changed, update the whole directory on next
+	 * sf_getdent
+	 */
+	int force_reread;
+	/* file structure, only valid between open() and release() */
+	struct file *file;
+	/*
+	 * handle valid if a file was created with sf_create_aux until it
+	 * will be opened with sf_reg_open()
+	 */
+	u64 handle;
+	/* The VFS inode struct */
+	struct inode vfs_inode;
+};
+
+struct sf_dir_info {
+	struct list_head info_list;
+};
+
+struct sf_dir_buf {
+	size_t entries;
+	size_t free;
+	size_t used;
+	void *buf;
+	struct list_head head;
+};
+
+struct sf_reg_info {
+	u64 handle;
+};
+
+/* globals */
+extern const struct inode_operations sf_dir_iops;
+extern const struct inode_operations sf_lnk_iops;
+extern const struct inode_operations sf_reg_iops;
+extern const struct file_operations sf_dir_fops;
+extern const struct file_operations sf_reg_fops;
+extern const struct address_space_operations sf_reg_aops;
+
+void sf_init_inode(struct sf_glob_info *sf_g, struct inode *inode,
+		   const struct shfl_fsobjinfo *info);
+int sf_stat(const char *caller, struct sf_glob_info *sf_g,
+	    struct shfl_string *path, struct shfl_fsobjinfo *result,
+	    int ok_to_fail);
+int sf_inode_revalidate(struct dentry *dentry);
+int sf_getattr(const struct path *path, struct kstat *kstat,
+	       u32 request_mask, unsigned int query_flags);
+int sf_setattr(struct dentry *dentry, struct iattr *iattr);
+int sf_path_from_dentry(const char *caller, struct sf_glob_info *sf_g,
+			struct sf_inode_info *sf_i,
+			struct dentry *dentry, struct shfl_string **result);
+int sf_nlscpy(struct sf_glob_info *sf_g, char *name,
+	      size_t name_bound_len, const unsigned char *utf8_name,
+	      size_t utf8_len);
+void sf_dir_info_free(struct sf_dir_info *p);
+void sf_dir_info_empty(struct sf_dir_info *p);
+struct sf_dir_info *sf_dir_info_alloc(void);
+int sf_dir_read_all(struct sf_glob_info *sf_g,
+		    struct sf_inode_info *sf_i, struct sf_dir_info *sf_d,
+		    u64 handle);
+
+#endif
diff --git a/include/uapi/linux/vbsfmount.h b/include/uapi/linux/vbsfmount.h
new file mode 100644
index 000000000000..21aa546a2a64
--- /dev/null
+++ b/include/uapi/linux/vbsfmount.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * VirtualBox Guest Shared Folders: mount(2) parameter structure.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef VBFS_MOUNT_H
+#define VBFS_MOUNT_H
+
+/* Linux constraints the size of data mount argument to PAGE_SIZE - 1. */
+#define MAX_HOST_NAME  256
+#define MAX_NLS_NAME    32
+
+#define VBSF_MOUNT_SIGNATURE_BYTE_0 ('\377')
+#define VBSF_MOUNT_SIGNATURE_BYTE_1 ('\376')
+#define VBSF_MOUNT_SIGNATURE_BYTE_2 ('\375')
+
+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;
+	char signature[3];	/* signature */
+	int length;		/* length of the whole structure */
+	char name[MAX_HOST_NAME];	/* share name */
+	char nls_name[MAX_NLS_NAME];	/* name of an I/O charset */
+	int uid;		/* user ID for all entries, default 0=root */
+	int gid;		/* group ID for all entries, default 0=root */
+	int ttl;		/* time to live */
+	int dmode;		/* mode for directories if != 0xffffffff */
+	int fmode;		/* mode for regular files if != 0xffffffff */
+	int dmask;		/* umask applied to directories */
+	int fmask;		/* umask applied to regular files */
+};
+
+struct vbsf_mount_opts {
+	int uid;
+	int gid;
+	int ttl;
+	int dmode;
+	int fmode;
+	int dmask;
+	int fmask;
+	int ronly;
+	int sloppy;
+	int noexec;
+	int nodev;
+	int nosuid;
+	int remount;
+	char nls_name[MAX_NLS_NAME];
+	char *convertcp;
+};
+
+#endif /* vbsfmount.h */
-- 
2.14.3

  reply	other threads:[~2018-01-15 17:51 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-15 17:51 [PATCH v2 0/1] " Hans de Goede
2018-01-15 17:51 ` Hans de Goede [this message]
2018-01-15 17:55   ` [PATCH v2] " Christoph Hellwig
2018-01-15 18:01     ` Hans de Goede
2018-01-15 19:32   ` Amir Goldstein
2018-01-15 19:41     ` Hans de Goede
2018-01-15 20:22       ` Amir Goldstein
2018-01-15 22:36   ` Al Viro
2018-01-16 10:15     ` Hans de Goede
2018-01-17  3:19       ` Al Viro
2018-01-17 10:45         ` Hans de Goede

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