Linux v5.5.6 rebase

1 files changed, 3487 insertions, 0 deletions

diff --git a/0001-fs-Add-VirtualBox-guest-shared-folder-vboxsf-support.patch b/0001-fs-Add-VirtualBox-guest-shared-folder-vboxsf-support.patch
new file mode 100644
index 000000000..531779ce6
--- /dev/null
+++ b/0001-fs-Add-VirtualBox-guest-shared-folder-vboxsf-support.patch
@@ -0,0 +1,3487 @@
+From 25bd71190fef59375de6115044556d062a965801 Mon Sep 17 00:00:00 2001
+From: Hans de Goede <hdegoede@redhat.com>
+Date: Mon, 25 Nov 2019 11:12:11 +0100
+Subject: [PATCH v3] fs: Add VirtualBox guest shared folder (vboxsf) support
+
+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.
+
+Acked-by: Christoph Hellwig <hch@infradead.org>
+Signed-off-by: Hans de Goede <hdegoede@redhat.com>
+---
+Changes in v19:
+- Misc. small code tweaks suggested by Al Viro (no functional changes)
+- Do not increment dir_context->pos when dir_emit has returned false.
+- Add a WARN_ON check for trying to access beyond the end of a
+  vboxsf directory buffer, this uses WARN_ON as this means the host has
+  given us corrupt data
+- Catch the user passing the "nls" opt more then once
+
+Changes in v18:
+- Move back to fs/vboxsf for direct submission to Linus
+- Squash in a few small fixes done during vboxsf's brief stint in staging
+- Add handling of short copies to vboxsf_write_end
+- Add a comment about our simple_write_begin usage (Suggested by David Howell)
+
+Changes in v17:
+- Submit upstream through drivers/staging as this is not getting any
+  traction on the fsdevel list
+- Add TODO file
+- vboxsf_free_inode uses sbi->idr, call rcu_barrier from put_super to make
+  sure all delayed rcu free inodes are flushed
+
+Changes in v16:
+- Make vboxsf_parse_monolithic() static, reported-by: kbuild test robot
+
+Changes in v15:
+- Rebase on top of 5.4-rc1
+
+Changes in v14
+- Add a commment explaining possible read cache strategies and which one
+  has been chosen
+- Change pagecache-invalidation on open (inode_revalidate) to use
+  invalidate_inode_pages2() so that mmap-ed pages are dropped from
+  the cache too
+- Add a comment to vboxsf_file_release explaining why the
+  filemap_write_and_wait() call is done there
+- Some minor code tweaks
+
+Changes in v13
+- Add SPDX tag to Makefile, use foo-y := to set objectfile list
+- Drop kerneldoc headers stating the obvious from vfs callbacks,
+  to avoid them going stale
+- Replace sf_ prefix of functions and data-types with vboxsf_
+- Use more normal naming scheme for sbi and private inode data:
+    struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
+    struct vboxsf_inode *sf_i = VBOXSF_I(inode);
+- Refactor directory reading code
+- Use goto based unwinding instead of nested if-s in a number of places
+- Consolidate dir unlink and rmdir inode_operations into a single function
+- Use the page-cache for regular reads/writes too
+- Directly set super_operations.free_inode to what used to be our
+  vboxsf_i_callback, instead of setting super_operations.destroy_inode
+  to a function which just does: call_rcu(&inode->i_rcu, vboxsf_i_callback);
+- Use spinlock_irqsafe for ino_idr_lock
+  vboxsf_free_inode may be called from a RCU callback, and thus from
+  softirq context, so we need to use spinlock_irqsafe vboxsf_new_inode.
+  On alloc_inode failure vboxsf_free_inode may be called from process
+  context, so it too needs to use spinlock_irqsafe.
+
+Changes in v12:
+- Move make_kuid / make_kgid calls to option parsing time and add
+  uid_valid / gid_valid checks.
+- In init_fs_context call current_uid_gid() to init uid and gid
+- Validate dmode, fmode, dmask and fmask options during option parsing
+- Use correct types for various mount option variables (kuid_t, kgid_t, umode_t)
+- Some small coding-style tweaks
+
+Changes in v11:
+- Convert to the new Documentation/filesystems/mount_api.txt mount API
+- Fixed all the function kerneldoc comments to have things in the proper order
+- Change type of d_type variable passed as type to dir_emit from int to
+  unsigned int
+- Replaced the fake-ino overflow test with the one suggested by David Howells
+- Fixed various coding style issues
+
+See cover-letter for full changelog including older versions
+---
+ MAINTAINERS                 |   6 +
+ fs/Kconfig                  |   1 +
+ fs/Makefile                 |   1 +
+ fs/vboxsf/Kconfig           |  10 +
+ fs/vboxsf/Makefile          |   5 +
+ fs/vboxsf/dir.c             | 427 +++++++++++++++++
+ fs/vboxsf/file.c            | 379 +++++++++++++++
+ fs/vboxsf/shfl_hostintf.h   | 901 ++++++++++++++++++++++++++++++++++++
+ fs/vboxsf/super.c           | 497 ++++++++++++++++++++
+ fs/vboxsf/utils.c           | 551 ++++++++++++++++++++++
+ fs/vboxsf/vboxsf_wrappers.c | 371 +++++++++++++++
+ fs/vboxsf/vfsmod.h          | 137 ++++++
+ 12 files changed, 3286 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/vfsmod.h
+
+diff --git a/MAINTAINERS b/MAINTAINERS
+index 56765f542244..db3cec531b32 100644
+--- a/MAINTAINERS
++++ b/MAINTAINERS
+@@ -17612,6 +17612,12 @@ F:	include/linux/vbox_utils.h
+ F:	include/uapi/linux/vbox*.h
+ F:	drivers/virt/vboxguest/
+ 
++VIRTUAL BOX SHARED FOLDER VFS DRIVER:
++M:	Hans de Goede <hdegoede@redhat.com>
++L:	linux-fsdevel@vger.kernel.org
++S:	Maintained
++F:	fs/vboxsf/*
++
+ VIRTUAL SERIO DEVICE DRIVER
+ M:	Stephen Chandler Paul <thatslyude@gmail.com>
+ S:	Maintained
+diff --git a/fs/Kconfig b/fs/Kconfig
+index 7b623e9fc1b0..8493a3f0c4b1 100644
+--- a/fs/Kconfig
++++ b/fs/Kconfig
+@@ -264,6 +264,7 @@ source "fs/pstore/Kconfig"
+ source "fs/sysv/Kconfig"
+ source "fs/ufs/Kconfig"
+ source "fs/erofs/Kconfig"
++source "fs/vboxsf/Kconfig"
+ 
+ endif # MISC_FILESYSTEMS
+ 
+diff --git a/fs/Makefile b/fs/Makefile
+index 1148c555c4d3..b807cbff3790 100644
+--- a/fs/Makefile
++++ b/fs/Makefile
+@@ -133,3 +133,4 @@ obj-$(CONFIG_CEPH_FS)		+= ceph/
+ obj-$(CONFIG_PSTORE)		+= pstore/
+ obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
+ obj-$(CONFIG_EROFS_FS)		+= erofs/
++obj-$(CONFIG_VBOXSF_FS)		+= vboxsf/
+diff --git a/fs/vboxsf/Kconfig b/fs/vboxsf/Kconfig
+new file mode 100644
+index 000000000000..b84586ae08b3
+--- /dev/null
++++ b/fs/vboxsf/Kconfig
+@@ -0,0 +1,10 @@
++config VBOXSF_FS
++	tristate "VirtualBox guest shared folder (vboxsf) support"
++	depends on X86 && VBOXGUEST
++	select NLS
++	help
++	  VirtualBox hosts can share folders with guests, this driver
++	  implements the Linux-guest side of this allowing folders exported
++	  by the host to be mounted under Linux.
++
++	  If you want to use shared folders in VirtualBox guests, answer Y or M.
+diff --git a/fs/vboxsf/Makefile b/fs/vboxsf/Makefile
+new file mode 100644
+index 000000000000..9e4328e79623
+--- /dev/null
++++ b/fs/vboxsf/Makefile
+@@ -0,0 +1,5 @@
++# SPDX-License-Identifier: MIT
++
++obj-$(CONFIG_VBOXSF_FS) += vboxsf.o
++
++vboxsf-y := 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..dd147b490982
+--- /dev/null
++++ b/fs/vboxsf/dir.c
+@@ -0,0 +1,427 @@
++// SPDX-License-Identifier: MIT
++/*
++ * VirtualBox Guest Shared Folders support: Directory inode and file operations
++ *
++ * Copyright (C) 2006-2018 Oracle Corporation
++ */
++
++#include <linux/namei.h>
++#include <linux/vbox_utils.h>
++#include "vfsmod.h"
++
++static int vboxsf_dir_open(struct inode *inode, struct file *file)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
++	struct shfl_createparms params = {};
++	struct vboxsf_dir_info *sf_d;
++	int err;
++
++	sf_d = vboxsf_dir_info_alloc();
++	if (!sf_d)
++		return -ENOMEM;
++
++	params.handle = SHFL_HANDLE_NIL;
++	params.create_flags = SHFL_CF_DIRECTORY | SHFL_CF_ACT_OPEN_IF_EXISTS |
++			      SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
++
++	err = vboxsf_create_at_dentry(file_dentry(file), &params);
++	if (err)
++		goto err_free_dir_info;
++
++	if (params.result != SHFL_FILE_EXISTS) {
++		err = -ENOENT;
++		goto err_close;
++	}
++
++	err = vboxsf_dir_read_all(sbi, sf_d, params.handle);
++	if (err)
++		goto err_close;
++
++	vboxsf_close(sbi->root, params.handle);
++	file->private_data = sf_d;
++	return 0;
++
++err_close:
++	vboxsf_close(sbi->root, params.handle);
++err_free_dir_info:
++	vboxsf_dir_info_free(sf_d);
++	return err;
++}
++
++static int vboxsf_dir_release(struct inode *inode, struct file *file)
++{
++	if (file->private_data)
++		vboxsf_dir_info_free(file->private_data);
++
++	return 0;
++}
++
++static unsigned int vboxsf_get_d_type(u32 mode)
++{
++	unsigned 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;
++}
++
++static bool vboxsf_dir_emit(struct file *dir, struct dir_context *ctx)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(file_inode(dir)->i_sb);
++	struct vboxsf_dir_info *sf_d = dir->private_data;
++	struct shfl_dirinfo *info;
++	struct vboxsf_dir_buf *b;
++	unsigned int d_type;
++	loff_t i, cur = 0;
++	ino_t fake_ino;
++	void *end;
++	int err;
++
++	list_for_each_entry(b, &sf_d->info_list, head) {
++try_next_entry:
++		if (ctx->pos >= cur + b->entries) {
++			cur += b->entries;
++			continue;
++		}
++
++		/*
++		 * Note the vboxsf_dir_info objects we are iterating over here
++		 * are variable sized, so the info pointer may end up being
++		 * unaligned. This is how we get the data from the host.
++		 * Since vboxsf is only supported on x86 machines this is not
++		 * a problem.
++		 */
++		for (i = 0, info = b->buf; i < ctx->pos - cur; i++) {
++			end = &info->name.string.utf8[info->name.size];
++			/* Only happens if the host gives us corrupt data */
++			if (WARN_ON(end > (b->buf + b->used)))
++				return false;
++			info = end;
++		}
++
++		end = &info->name.string.utf8[info->name.size];
++		if (WARN_ON(end > (b->buf + b->used)))
++			return false;
++
++		/* Info now points to the right entry, emit it. */
++		d_type = vboxsf_get_d_type(info->info.attr.mode);
++
++		/*
++		 * On 32 bit systems pos is 64 signed, while ino is 32 bit
++		 * unsigned so fake_ino may overflow, check for this.
++		 */
++		if ((ino_t)(ctx->pos + 1) != (u64)(ctx->pos + 1)) {
++			vbg_err("vboxsf: fake ino overflow, truncating dir\n");
++			return false;
++		}
++		fake_ino = ctx->pos + 1;
++
++		if (sbi->nls) {
++			char d_name[NAME_MAX];
++
++			err = vboxsf_nlscpy(sbi, d_name, NAME_MAX,
++					    info->name.string.utf8,
++					    info->name.length);
++			if (err) {
++				/* skip erroneous entry and proceed */
++				ctx->pos += 1;
++				goto try_next_entry;
++			}
++
++			return dir_emit(ctx, d_name, strlen(d_name),
++					fake_ino, d_type);
++		}
++
++		return dir_emit(ctx, info->name.string.utf8, info->name.length,
++				fake_ino, d_type);
++	}
++
++	return false;
++}
++
++static int vboxsf_dir_iterate(struct file *dir, struct dir_context *ctx)
++{
++	bool emitted;
++
++	do {
++		emitted = vboxsf_dir_emit(dir, ctx);
++		if (emitted)
++			ctx->pos += 1;
++	} while (emitted);
++
++	return 0;
++}
++
++const struct file_operations vboxsf_dir_fops = {
++	.open = vboxsf_dir_open,
++	.iterate = vboxsf_dir_iterate,
++	.release = vboxsf_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 vboxsf_inode_revalidate.
++ */
++static int vboxsf_dentry_revalidate(struct dentry *dentry, unsigned int flags)
++{
++	if (flags & LOOKUP_RCU)
++		return -ECHILD;
++
++	if (d_really_is_positive(dentry))
++		return vboxsf_inode_revalidate(dentry) == 0;
++	else
++		return vboxsf_stat_dentry(dentry, NULL) == -ENOENT;
++}
++
++const struct dentry_operations vboxsf_dentry_ops = {
++	.d_revalidate = vboxsf_dentry_revalidate
++};
++
++/* iops */
++
++static struct dentry *vboxsf_dir_lookup(struct inode *parent,
++					struct dentry *dentry,
++					unsigned int flags)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
++	struct shfl_fsobjinfo fsinfo;
++	struct inode *inode;
++	int err;
++
++	dentry->d_time = jiffies;
++
++	err = vboxsf_stat_dentry(dentry, &fsinfo);
++	if (err) {
++		inode = (err == -ENOENT) ? NULL : ERR_PTR(err);
++	} else {
++		inode = vboxsf_new_inode(parent->i_sb);
++		if (!IS_ERR(inode))
++			vboxsf_init_inode(sbi, inode, &fsinfo);
++	}
++
++	return d_splice_alias(inode, dentry);
++}
++
++static int vboxsf_dir_instantiate(struct inode *parent, struct dentry *dentry,
++				  struct shfl_fsobjinfo *info)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
++	struct vboxsf_inode *sf_i;
++	struct inode *inode;
++
++	inode = vboxsf_new_inode(parent->i_sb);
++	if (IS_ERR(inode))
++		return PTR_ERR(inode);
++
++	sf_i = VBOXSF_I(inode);
++	/* The host may have given us different attr then requested */
++	sf_i->force_restat = 1;
++	vboxsf_init_inode(sbi, inode, info);
++
++	d_instantiate(dentry, inode);
++
++	return 0;
++}
++
++static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
++			     umode_t mode, int is_dir)
++{
++	struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
++	struct shfl_createparms params = {};
++	int err;
++
++	params.handle = SHFL_HANDLE_NIL;
++	params.create_flags = 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 = (mode & 0777) |
++				(is_dir ? SHFL_TYPE_DIRECTORY : SHFL_TYPE_FILE);
++	params.info.attr.additional = SHFLFSOBJATTRADD_NOTHING;
++
++	err = vboxsf_create_at_dentry(dentry, &params);
++	if (err)
++		return err;
++
++	if (params.result != SHFL_FILE_CREATED)
++		return -EPERM;
++
++	vboxsf_close(sbi->root, params.handle);
++
++	err = vboxsf_dir_instantiate(parent, dentry, &params.info);
++	if (err)
++		return err;
++
++	/* parent directory access/change time changed */
++	sf_parent_i->force_restat = 1;
++
++	return 0;
++}
++
++static int vboxsf_dir_mkfile(struct inode *parent, struct dentry *dentry,
++			     umode_t mode, bool excl)
++{
++	return vboxsf_dir_create(parent, dentry, mode, 0);
++}
++
++static int vboxsf_dir_mkdir(struct inode *parent, struct dentry *dentry,
++			    umode_t mode)
++{
++	return vboxsf_dir_create(parent, dentry, mode, 1);
++}
++
++static int vboxsf_dir_unlink(struct inode *parent, struct dentry *dentry)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
++	struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
++	struct inode *inode = d_inode(dentry);
++	struct shfl_string *path;
++	u32 flags;
++	int err;
++
++	if (S_ISDIR(inode->i_mode))
++		flags = SHFL_REMOVE_DIR;
++	else
++		flags = SHFL_REMOVE_FILE;
++
++	if (S_ISLNK(inode->i_mode))
++		flags |= SHFL_REMOVE_SYMLINK;
++
++	path = vboxsf_path_from_dentry(sbi, dentry);
++	if (IS_ERR(path))
++		return PTR_ERR(path);
++
++	err = vboxsf_remove(sbi->root, path, flags);
++	__putname(path);
++	if (err)
++		return err;
++
++	/* parent directory access/change time changed */
++	sf_parent_i->force_restat = 1;
++
++	return 0;
++}
++
++static int vboxsf_dir_rename(struct inode *old_parent,
++			     struct dentry *old_dentry,
++			     struct inode *new_parent,
++			     struct dentry *new_dentry,
++			     unsigned int flags)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(old_parent->i_sb);
++	struct vboxsf_inode *sf_old_parent_i = VBOXSF_I(old_parent);
++	struct vboxsf_inode *sf_new_parent_i = VBOXSF_I(new_parent);
++	u32 shfl_flags = SHFL_RENAME_FILE | SHFL_RENAME_REPLACE_IF_EXISTS;
++	struct shfl_string *old_path, *new_path;
++	int err;
++
++	if (flags)
++		return -EINVAL;
++
++	old_path = vboxsf_path_from_dentry(sbi, old_dentry);
++	if (IS_ERR(old_path))
++		return PTR_ERR(old_path);
++
++	new_path = vboxsf_path_from_dentry(sbi, new_dentry);
++	if (IS_ERR(new_path)) {
++		err = PTR_ERR(new_path);
++		goto err_put_old_path;
++	}
++
++	if (d_inode(old_dentry)->i_mode & S_IFDIR)
++		shfl_flags = 0;
++
++	err = vboxsf_rename(sbi->root, old_path, new_path, shfl_flags);
++	if (err == 0) {
++		/* parent directories access/change time changed */
++		sf_new_parent_i->force_restat = 1;
++		sf_old_parent_i->force_restat = 1;
++	}
++
++	__putname(new_path);
++err_put_old_path:
++	__putname(old_path);
++	return err;
++}
++
++static int vboxsf_dir_symlink(struct inode *parent, struct dentry *dentry,
++			      const char *symname)
++{
++	struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
++	int symname_size = strlen(symname) + 1;
++	struct shfl_string *path, *ssymname;
++	struct shfl_fsobjinfo info;
++	int err;
++
++	path = vboxsf_path_from_dentry(sbi, dentry);
++	if (IS_ERR(path))
++		return PTR_ERR(path);
++
++	ssymname = kmalloc(SHFLSTRING_HEADER_SIZE + symname_size, GFP_KERNEL);
++	if (!ssymname) {
++		__putname(path);
++		return -ENOMEM;
++	}
++	ssymname->length = symname_size - 1;
++	ssymname->size = symname_size;
++	memcpy(ssymname->string.utf8, symname, symname_size);
++
++	err = vboxsf_symlink(sbi->root, path, ssymname, &info);
++	kfree(ssymname);
++	__putname(path);
++	if (err) {
++		/* -EROFS means symlinks are note support -> -EPERM */
++		return (err == -EROFS) ? -EPERM : err;
++	}
++
++	err = vboxsf_dir_instantiate(parent, dentry, &info);
++	if (err)
++		return err;
++
++	/* parent directory access/change time changed */
++	sf_parent_i->force_restat = 1;
++	return 0;
++}
++
++const struct inode_operations vboxsf_dir_iops = {
++	.lookup  = vboxsf_dir_lookup,
++	.create  = vboxsf_dir_mkfile,
++	.mkdir   = vboxsf_dir_mkdir,
++	.rmdir   = vboxsf_dir_unlink,
++	.unlink  = vboxsf_dir_unlink,
++	.rename  = vboxsf_dir_rename,
++	.symlink = vboxsf_dir_symlink,
++	.getattr = vboxsf_getattr,
++	.setattr = vboxsf_setattr,
++};
+diff --git a/fs/vboxsf/file.c b/fs/vboxsf/file.c
+new file mode 100644
+index 000000000000..c4ab5996d97a
+--- /dev/null
++++ b/fs/vboxsf/file.c
+@@ -0,0 +1,379 @@
++// SPDX-License-Identifier: MIT
++/*
++ * VirtualBox Guest Shared Folders support: Regular file inode and file ops.
++ *
++ * Copyright (C) 2006-2018 Oracle Corporation
++ */
++
++#include <linux/mm.h>
++#include <linux/page-flags.h>
++#include <linux/pagemap.h>
++#include <linux/highmem.h>
++#include <linux/sizes.h>
++#include "vfsmod.h"
++
++struct vboxsf_handle {
++	u64 handle;
++	u32 root;
++	u32 access_flags;
++	struct kref refcount;
++	struct list_head head;
++};
++
++static int vboxsf_file_open(struct inode *inode, struct file *file)
++{
++	struct vboxsf_inode *sf_i = VBOXSF_I(inode);
++	struct shfl_createparms params = {};
++	struct vboxsf_handle *sf_handle;
++	u32 access_flags = 0;
++	int err;
++
++	sf_handle = kmalloc(sizeof(*sf_handle), GFP_KERNEL);
++	if (!sf_handle)
++		return -ENOMEM;
++
++	/*
++	 * 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.
++	 */
++	params.handle = SHFL_HANDLE_NIL;
++	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:
++		access_flags |= SHFL_CF_ACCESS_READ;
++		break;
++
++	case O_WRONLY:
++		access_flags |= SHFL_CF_ACCESS_WRITE;
++		break;
++
++	case O_RDWR:
++		access_flags |= SHFL_CF_ACCESS_READWRITE;
++		break;
++
++	default:
++		WARN_ON(1);
++	}
++
++	if (file->f_flags & O_APPEND)
++		access_flags |= SHFL_CF_ACCESS_APPEND;
++
++	params.create_flags |= access_flags;
++	params.info.attr.mode = inode->i_mode;
++
++	err = vboxsf_create_at_dentry(file_dentry(file), &params);
++	if (err == 0 && params.handle == SHFL_HANDLE_NIL)
++		err = (params.result == SHFL_FILE_EXISTS) ? -EEXIST : -ENOENT;
++	if (err) {
++		kfree(sf_handle);
++		return err;
++	}
++
++	/* the host may have given us different attr then requested */
++	sf_i->force_restat = 1;
++
++	/* init our handle struct and add it to the inode's handles list */
++	sf_handle->handle = params.handle;
++	sf_handle->root = VBOXSF_SBI(inode->i_sb)->root;
++	sf_handle->access_flags = access_flags;
++	kref_init(&sf_handle->refcount);
++
++	mutex_lock(&sf_i->handle_list_mutex);
++	list_add(&sf_handle->head, &sf_i->handle_list);
++	mutex_unlock(&sf_i->handle_list_mutex);
++
++	file->private_data = sf_handle;
++	return 0;
++}
++
++static void vboxsf_handle_release(struct kref *refcount)
++{
++	struct vboxsf_handle *sf_handle =
++		container_of(refcount, struct vboxsf_handle, refcount);
++
++	vboxsf_close(sf_handle->root, sf_handle->handle);
++	kfree(sf_handle);
++}
++
++static int vboxsf_file_release(struct inode *inode, struct file *file)
++{
++	struct vboxsf_inode *sf_i = VBOXSF_I(inode);
++	struct vboxsf_handle *sf_handle = file->private_data;
++
++	/*
++	 * When a file is closed on our (the guest) side, we want any subsequent
++	 * accesses done on the host side to see all changes done from our side.
++	 */
++	filemap_write_and_wait(inode->i_mapping);
++
++	mutex_lock(&sf_i->handle_list_mutex);
++	list_del(&sf_handle->head);
++	mutex_unlock(&sf_i->handle_list_mutex);
++
++	kref_put(&sf_handle->refcount, vboxsf_handle_release);
++	return 0;
++}
++
++/*
++ * Write back dirty pages now, because there may not be any suitable
++ * open files later
++ */
++static void vboxsf_vma_close(struct vm_area_struct *vma)
++{
++	filemap_write_and_wait(vma->vm_file->f_mapping);
++}
++
++static const struct vm_operations_struct vboxsf_file_vm_ops = {
++	.close		= vboxsf_vma_close,
++	.fault		= filemap_fault,
++	.map_pages	= filemap_map_pages,
++};
++
++static int vboxsf_file_mmap(struct file *file, struct vm_area_struct *vma)
++{
++	int err;
++
++	err = generic_file_mmap(file, vma);
++	if (!err)
++		vma->vm_ops = &vboxsf_file_vm_ops;
++
++	return err;
++}
++
++/*
++ * Note that since we are accessing files on the host's filesystem, files
++ * may always be changed underneath us by the host!
++ *
++ * The vboxsf API between the guest and the host does not offer any functions
++ * to deal with this. There is no inode-generation to check for changes, no
++ * events / callback on changes and no way to lock files.
++ *
++ * To avoid returning stale data when a file gets *opened* on our (the guest)
++ * side, we do a "stat" on the host side, then compare the mtime with the
++ * last known mtime and invalidate the page-cache if they differ.
++ * This is done from vboxsf_inode_revalidate().
++ *
++ * When reads are done through the read_iter fop, it is possible to do
++ * further cache revalidation then, there are 3 options to deal with this:
++ *
++ * 1)  Rely solely on the revalidation done at open time
++ * 2)  Do another "stat" and compare mtime again. Unfortunately the vboxsf
++ *     host API does not allow stat on handles, so we would need to use
++ *     file->f_path.dentry and the stat will then fail if the file was unlinked
++ *     or renamed (and there is no thing like NFS' silly-rename). So we get:
++ * 2a) "stat" and compare mtime, on stat failure invalidate the cache
++ * 2b) "stat" and compare mtime, on stat failure do nothing
++ * 3)  Simply always call invalidate_inode_pages2_range on the range of the read
++ *
++ * Currently we are keeping things KISS and using option 1. this allows
++ * directly using generic_file_read_iter without wrapping it.
++ *
++ * This means that only data written on the host side before open() on
++ * the guest side is guaranteed to be seen by the guest. If necessary
++ * we may provide other read-cache strategies in the future and make this
++ * configurable through a mount option.
++ */
++const struct file_operations vboxsf_reg_fops = {
++	.llseek = generic_file_llseek,
++	.read_iter = generic_file_read_iter,
++	.write_iter = generic_file_write_iter,
++	.mmap = vboxsf_file_mmap,
++	.open = vboxsf_file_open,
++	.release = vboxsf_file_release,
++	.fsync = noop_fsync,
++	.splice_read = generic_file_splice_read,
++};
++
++const struct inode_operations vboxsf_reg_iops = {
++	.getattr = vboxsf_getattr,
++	.setattr = vboxsf_setattr
++};
++
++static int vboxsf_readpage(struct file *file, struct page *page)
++{
++	struct vboxsf_handle *sf_handle = file->private_data;
++	loff_t off = page_offset(page);
++	u32 nread = PAGE_SIZE;
++	u8 *buf;
++	int err;
++
++	buf = kmap(page);
++
++	err = vboxsf_read(sf_handle->root, sf_handle->handle, off, &nread, buf);
++	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 struct vboxsf_handle *vboxsf_get_write_handle(struct vboxsf_inode *sf_i)
++{
++	struct vboxsf_handle *h, *sf_handle = NULL;
++
++	mutex_lock(&sf_i->handle_list_mutex);
++	list_for_each_entry(h, &sf_i->handle_list, head) {
++		if (h->access_flags == SHFL_CF_ACCESS_WRITE ||
++		    h->access_flags == SHFL_CF_ACCESS_READWRITE) {
++			kref_get(&h->refcount);
++			sf_handle = h;
++			break;
++		}
++	}
++	mutex_unlock(&sf_i->handle_list_mutex);
++
++	return sf_handle;
++}
++
++static int vboxsf_writepage(struct page *page, struct writeback_control *wbc)
++{
++	struct inode *inode = page->mapping->host;
++	struct vboxsf_inode *sf_i = VBOXSF_I(inode);
++	struct vboxsf_handle *sf_handle;
++	loff_t off = page_offset(page);
++	loff_t size = i_size_read(inode);
++	u32 nwrite = PAGE_SIZE;
++	u8 *buf;
++	int err;
++
++	if (off + PAGE_SIZE > size)
++		nwrite = size & ~PAGE_MASK;
++
++	sf_handle = vboxsf_get_write_handle(sf_i);
++	if (!sf_handle)
++		return -EBADF;
++
++	buf = kmap(page);
++	err = vboxsf_write(sf_handle->root, sf_handle->handle,
++			   off, &nwrite, buf);
++	kunmap(page);
++
++	kref_put(&sf_handle->refcount, vboxsf_handle_release);
++
++	if (err == 0) {
++		ClearPageError(page);
++		/* mtime changed */
++		sf_i->force_restat = 1;
++	} else {
++		ClearPageUptodate(page);
++	}
++
++	unlock_page(page);
++	return err;
++}
++
++static int vboxsf_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 vboxsf_handle *sf_handle = file->private_data;
++	unsigned int from = pos & ~PAGE_MASK;
++	u32 nwritten = len;
++	u8 *buf;
++	int err;
++
++	/* zero the stale part of the page if we did a short copy */
++	if (!PageUptodate(page) && copied < len)
++		zero_user(page, from + copied, len - copied);
++
++	buf = kmap(page);
++	err = vboxsf_write(sf_handle->root, sf_handle->handle,
++			   pos, &nwritten, buf + from);
++	kunmap(page);
++
++	if (err) {
++		nwritten = 0;
++		goto out;
++	}
++
++	/* mtime changed */
++	VBOXSF_I(inode)->force_restat = 1;
++
++	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 nwritten;
++}
++
++/*
++ * Note simple_write_begin does not read the page from disk on partial writes
++ * this is ok since vboxsf_write_end only writes the written parts of the
++ * page and it does not call SetPageUptodate for partial writes.
++ */
++const struct address_space_operations vboxsf_reg_aops = {
++	.readpage = vboxsf_readpage,
++	.writepage = vboxsf_writepage,
++	.set_page_dirty = __set_page_dirty_nobuffers,
++	.write_begin = simple_write_begin,
++	.write_end = vboxsf_write_end,
++};
++
++static const char *vboxsf_get_link(struct dentry *dentry, struct inode *inode,
++				   struct delayed_call *done)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
++	struct shfl_string *path;
++	char *link;
++	int err;
++
++	if (!dentry)
++		return ERR_PTR(-ECHILD);
++
++	path = vboxsf_path_from_dentry(sbi, dentry);
++	if (IS_ERR(path))
++		return ERR_CAST(path);
++
++	link = kzalloc(PATH_MAX, GFP_KERNEL);
++	if (!link) {
++		__putname(path);
++		return ERR_PTR(-ENOMEM);
++	}
++
++	err = vboxsf_readlink(sbi->root, path, PATH_MAX, link);
++	__putname(path);
++	if (err) {
++		kfree(link);
++		return ERR_PTR(err);
++	}
++
++	set_delayed_call(done, kfree_link, link);
++	return link;
++}
++
++const struct inode_operations vboxsf_lnk_iops = {
++	.get_link = vboxsf_get_link
++};
+diff --git a/fs/vboxsf/shfl_hostintf.h b/fs/vboxsf/shfl_hostintf.h
+new file mode 100644
+index 000000000000..aca829062c12
+--- /dev/null
++++ b/fs/vboxsf/shfl_hostintf.h
+@@ -0,0 +1,901 @@
++/* SPDX-License-Identifier: MIT */
++/*
++ * VirtualBox Shared Folders: host interface definition.
++ *
++ * Copyright (C) 2006-2018 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.
++ */
++
++enum {
++	SHFL_FN_QUERY_MAPPINGS = 1,	/* Query mappings changes. */
++	SHFL_FN_QUERY_MAP_NAME = 2,	/* Query map name. */
++	SHFL_FN_CREATE = 3,		/* Open/create object. */
++	SHFL_FN_CLOSE = 4,		/* Close object handle. */
++	SHFL_FN_READ = 5,		/* Read object content. */
++	SHFL_FN_WRITE = 6,		/* Write new object content. */
++	SHFL_FN_LOCK = 7,		/* Lock/unlock a range in the object. */
++	SHFL_FN_LIST = 8,		/* List object content. */
++	SHFL_FN_INFORMATION = 9,	/* Query/set object information. */
++	/* Note function number 10 is not used! */
++	SHFL_FN_REMOVE = 11,		/* Remove object */
++	SHFL_FN_MAP_FOLDER_OLD = 12,	/* Map folder (legacy) */
++	SHFL_FN_UNMAP_FOLDER = 13,	/* Unmap folder */
++	SHFL_FN_RENAME = 14,		/* Rename object */
++	SHFL_FN_FLUSH = 15,		/* Flush file */
++	SHFL_FN_SET_UTF8 = 16,		/* Select UTF8 filename encoding */
++	SHFL_FN_MAP_FOLDER = 17,	/* Map folder */
++	SHFL_FN_READLINK = 18,		/* Read symlink dest (as of VBox 4.0) */
++	SHFL_FN_SYMLINK = 19,		/* Create symlink (as of VBox 4.0) */
++	SHFL_FN_SET_SYMLINKS = 20,	/* Ask host to show symlinks (4.0+) */
++};
++
++/* Root handles for a mapping are of type u32, Root handles are unique. */
++#define SHFL_ROOT_NIL		UINT_MAX
++
++/* Shared folders handle for an opened object are of type u64. */
++#define SHFL_HANDLE_NIL		ULLONG_MAX
++
++/* 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[2];
++		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..b14ecd2948f4
+--- /dev/null
++++ b/fs/vboxsf/super.c
+@@ -0,0 +1,497 @@
++// SPDX-License-Identifier: MIT
++/*
++ * VirtualBox Guest Shared Folders support: Virtual File System.
++ *
++ * Module initialization/finalization
++ * File system registration/deregistration
++ * Superblock reading
++ * Few utility functions
++ *
++ * Copyright (C) 2006-2018 Oracle Corporation
++ */
++
++#include <linux/idr.h>
++#include <linux/fs_parser.h>
++#include <linux/magic.h>
++#include <linux/module.h>
++#include <linux/nls.h>
++#include <linux/statfs.h>
++#include <linux/vbox_utils.h>
++#include "vfsmod.h"
++
++#define VBOXSF_SUPER_MAGIC 0x786f4256 /* 'VBox' little endian */
++
++#define VBSF_MOUNT_SIGNATURE_BYTE_0 ('\000')
++#define VBSF_MOUNT_SIGNATURE_BYTE_1 ('\377')
++#define VBSF_MOUNT_SIGNATURE_BYTE_2 ('\376')
++#define VBSF_MOUNT_SIGNATURE_BYTE_3 ('\375')
++
++static int follow_symlinks;
++module_param(follow_symlinks, int, 0444);
++MODULE_PARM_DESC(follow_symlinks,
++		 "Let host resolve symlinks rather than showing them");
++
++static DEFINE_IDA(vboxsf_bdi_ida);
++static DEFINE_MUTEX(vboxsf_setup_mutex);
++static bool vboxsf_setup_done;
++static struct super_operations vboxsf_super_ops; /* forward declaration */
++static struct kmem_cache *vboxsf_inode_cachep;
++
++static char * const vboxsf_default_nls = CONFIG_NLS_DEFAULT;
++
++enum  { opt_nls, opt_uid, opt_gid, opt_ttl, opt_dmode, opt_fmode,
++	opt_dmask, opt_fmask };
++
++static const struct fs_parameter_spec vboxsf_param_specs[] = {
++	fsparam_string	("nls",		opt_nls),
++	fsparam_u32	("uid",		opt_uid),
++	fsparam_u32	("gid",		opt_gid),
++	fsparam_u32	("ttl",		opt_ttl),
++	fsparam_u32oct	("dmode",	opt_dmode),
++	fsparam_u32oct	("fmode",	opt_fmode),
++	fsparam_u32oct	("dmask",	opt_dmask),
++	fsparam_u32oct	("fmask",	opt_fmask),
++	{}
++};
++
++static const struct fs_parameter_description vboxsf_fs_parameters = {
++	.name  = "vboxsf",
++	.specs  = vboxsf_param_specs,
++};
++
++static int vboxsf_parse_param(struct fs_context *fc, struct fs_parameter *param)
++{
++	struct vboxsf_fs_context *ctx = fc->fs_private;
++	struct fs_parse_result result;
++	kuid_t uid;
++	kgid_t gid;
++	int opt;
++
++	opt = fs_parse(fc, &vboxsf_fs_parameters, param, &result);
++	if (opt < 0)
++		return opt;
++
++	switch (opt) {
++	case opt_nls:
++		if (ctx->nls_name || fc->purpose != FS_CONTEXT_FOR_MOUNT) {
++			vbg_err("vboxsf: Cannot reconfigure nls option\n");
++			return -EINVAL;
++		}
++		ctx->nls_name = param->string;
++		param->string = NULL;
++		break;
++	case opt_uid:
++		uid = make_kuid(current_user_ns(), result.uint_32);
++		if (!uid_valid(uid))
++			return -EINVAL;
++		ctx->o.uid = uid;
++		break;
++	case opt_gid:
++		gid = make_kgid(current_user_ns(), result.uint_32);
++		if (!gid_valid(gid))
++			return -EINVAL;
++		ctx->o.gid = gid;
++		break;
++	case opt_ttl:
++		ctx->o.ttl = msecs_to_jiffies(result.uint_32);
++		break;
++	case opt_dmode:
++		if (result.uint_32 & ~0777)
++			return -EINVAL;
++		ctx->o.dmode = result.uint_32;
++		ctx->o.dmode_set = true;
++		break;
++	case opt_fmode:
++		if (result.uint_32 & ~0777)
++			return -EINVAL;
++		ctx->o.fmode = result.uint_32;
++		ctx->o.fmode_set = true;
++		break;
++	case opt_dmask:
++		if (result.uint_32 & ~07777)
++			return -EINVAL;
++		ctx->o.dmask = result.uint_32;
++		break;
++	case opt_fmask:
++		if (result.uint_32 & ~07777)
++			return -EINVAL;
++		ctx->o.fmask = result.uint_32;
++		break;
++	default:
++		return -EINVAL;
++	}
++
++	return 0;
++}
++
++static int vboxsf_fill_super(struct super_block *sb, struct fs_context *fc)
++{
++	struct vboxsf_fs_context *ctx = fc->fs_private;
++	struct shfl_string *folder_name, root_path;
++	struct vboxsf_sbi *sbi;
++	struct dentry *droot;
++	struct inode *iroot;
++	char *nls_name;
++	size_t size;
++	int err;
++
++	if (!fc->source)
++		return -EINVAL;
++
++	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
++	if (!sbi)
++		return -ENOMEM;
++
++	sbi->o = ctx->o;
++	idr_init(&sbi->ino_idr);
++	spin_lock_init(&sbi->ino_idr_lock);
++	sbi->next_generation = 1;
++	sbi->bdi_id = -1;
++
++	/* Load nls if not utf8 */
++	nls_name = ctx->nls_name ? ctx->nls_name : vboxsf_default_nls;
++	if (strcmp(nls_name, "utf8") != 0) {
++		if (nls_name == vboxsf_default_nls)
++			sbi->nls = load_nls_default();
++		else
++			sbi->nls = load_nls(nls_name);
++
++		if (!sbi->nls) {
++			vbg_err("vboxsf: Count not load '%s' nls\n", nls_name);
++			err = -EINVAL;
++			goto fail_free;
++		}
++	}
++
++	sbi->bdi_id = ida_simple_get(&vboxsf_bdi_ida, 0, 0, GFP_KERNEL);
++	if (sbi->bdi_id < 0) {
++		err = sbi->bdi_id;
++		goto fail_free;
++	}
++
++	err = super_setup_bdi_name(sb, "vboxsf-%s.%d", fc->source, sbi->bdi_id);
++	if (err)
++		goto fail_free;
++
++	/* Turn source into a shfl_string and map the folder */
++	size = strlen(fc->source) + 1;
++	folder_name = kmalloc(SHFLSTRING_HEADER_SIZE + size, GFP_KERNEL);
++	if (!folder_name) {
++		err = -ENOMEM;
++		goto fail_free;
++	}
++	folder_name->size = size;
++	folder_name->length = size - 1;
++	strlcpy(folder_name->string.utf8, fc->source, size);
++	err = vboxsf_map_folder(folder_name, &sbi->root);
++	kfree(folder_name);
++	if (err) {
++		vbg_err("vboxsf: Host rejected mount of '%s' with error %d\n",
++			fc->source, err);
++		goto fail_free;
++	}
++
++	root_path.length = 1;
++	root_path.size = 2;
++	root_path.string.utf8[0] = '/';
++	root_path.string.utf8[1] = 0;
++	err = vboxsf_stat(sbi, &root_path, &sbi->root_info);
++	if (err)
++		goto fail_unmap;
++
++	sb->s_magic = VBOXSF_SUPER_MAGIC;
++	sb->s_blocksize = 1024;
++	sb->s_maxbytes = MAX_LFS_FILESIZE;
++	sb->s_op = &vboxsf_super_ops;
++	sb->s_d_op = &vboxsf_dentry_ops;
++
++	iroot = iget_locked(sb, 0);
++	if (!iroot) {
++		err = -ENOMEM;
++		goto fail_unmap;
++	}
++	vboxsf_init_inode(sbi, iroot, &sbi->root_info);
++	unlock_new_inode(iroot);
++
++	droot = d_make_root(iroot);
++	if (!droot) {
++		err = -ENOMEM;
++		goto fail_unmap;
++	}
++
++	sb->s_root = droot;
++	sb->s_fs_info = sbi;
++	return 0;
++
++fail_unmap:
++	vboxsf_unmap_folder(sbi->root);
++fail_free:
++	if (sbi->bdi_id >= 0)
++		ida_simple_remove(&vboxsf_bdi_ida, sbi->bdi_id);
++	if (sbi->nls)
++		unload_nls(sbi->nls);
++	idr_destroy(&sbi->ino_idr);
++	kfree(sbi);
++	return err;
++}
++
++static void vboxsf_inode_init_once(void *data)
++{
++	struct vboxsf_inode *sf_i = data;
++
++	mutex_init(&sf_i->handle_list_mutex);
++	inode_init_once(&sf_i->vfs_inode);
++}
++
++static struct inode *vboxsf_alloc_inode(struct super_block *sb)
++{
++	struct vboxsf_inode *sf_i;
++
++	sf_i = kmem_cache_alloc(vboxsf_inode_cachep, GFP_NOFS);
++	if (!sf_i)
++		return NULL;
++
++	sf_i->force_restat = 0;
++	INIT_LIST_HEAD(&sf_i->handle_list);
++
++	return &sf_i->vfs_inode;
++}
++
++static void vboxsf_free_inode(struct inode *inode)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
++	unsigned long flags;
++
++	spin_lock_irqsave(&sbi->ino_idr_lock, flags);
++	idr_remove(&sbi->ino_idr, inode->i_ino);
++	spin_unlock_irqrestore(&sbi->ino_idr_lock, flags);
++	kmem_cache_free(vboxsf_inode_cachep, VBOXSF_I(inode));
++}
++
++static void vboxsf_put_super(struct super_block *sb)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(sb);
++
++	vboxsf_unmap_folder(sbi->root);
++	if (sbi->bdi_id >= 0)
++		ida_simple_remove(&vboxsf_bdi_ida, sbi->bdi_id);
++	if (sbi->nls)
++		unload_nls(sbi->nls);
++
++	/*
++	 * vboxsf_free_inode uses the idr, make sure all delayed rcu free
++	 * inodes are flushed.
++	 */
++	rcu_barrier();
++	idr_destroy(&sbi->ino_idr);
++	kfree(sbi);
++}
++
++static int vboxsf_statfs(struct dentry *dentry, struct kstatfs *stat)
++{
++	struct super_block *sb = dentry->d_sb;
++	struct shfl_volinfo shfl_volinfo;
++	struct vboxsf_sbi *sbi;
++	u32 buf_len;
++	int err;
++
++	sbi = VBOXSF_SBI(sb);
++	buf_len = sizeof(shfl_volinfo);
++	err = vboxsf_fsinfo(sbi->root, 0, SHFL_INFO_GET | SHFL_INFO_VOLUME,
++			    &buf_len, &shfl_volinfo);
++	if (err)
++		return err;
++
++	stat->f_type = VBOXSF_SUPER_MAGIC;
++	stat->f_bsize = shfl_volinfo.bytes_per_allocation_unit;
++
++	do_div(shfl_volinfo.total_allocation_bytes,
++	       shfl_volinfo.bytes_per_allocation_unit);
++	stat->f_blocks = shfl_volinfo.total_allocation_bytes;
++
++	do_div(shfl_volinfo.available_allocation_bytes,
++	       shfl_volinfo.bytes_per_allocation_unit);
++	stat->f_bfree  = shfl_volinfo.available_allocation_bytes;
++	stat->f_bavail = shfl_volinfo.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 = 1000000;
++	stat->f_fsid.val[0] = 0;
++	stat->f_fsid.val[1] = 0;
++	stat->f_namelen = 255;
++	return 0;
++}
++
++static struct super_operations vboxsf_super_ops = {
++	.alloc_inode	= vboxsf_alloc_inode,
++	.free_inode	= vboxsf_free_inode,
++	.put_super	= vboxsf_put_super,
++	.statfs		= vboxsf_statfs,
++};
++
++static int vboxsf_setup(void)
++{
++	int err;
++
++	mutex_lock(&vboxsf_setup_mutex);
++
++	if (vboxsf_setup_done)
++		goto success;
++
++	vboxsf_inode_cachep =
++		kmem_cache_create("vboxsf_inode_cache",
++				  sizeof(struct vboxsf_inode), 0,
++				  (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD |
++				   SLAB_ACCOUNT),
++				  vboxsf_inode_init_once);
++	if (!vboxsf_inode_cachep) {
++		err = -ENOMEM;
++		goto fail_nomem;
++	}
++
++	err = vboxsf_connect();
++	if (err) {
++		vbg_err("vboxsf: err %d connecting to guest PCI-device\n", err);
++		vbg_err("vboxsf: make sure you are inside a VirtualBox VM\n");
++		vbg_err("vboxsf: and check dmesg for vboxguest errors\n");
++		goto fail_free_cache;
++	}
++
++	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);
++	}
++
++	vboxsf_setup_done = true;
++success:
++	mutex_unlock(&vboxsf_setup_mutex);
++	return 0;
++
++fail_disconnect:
++	vboxsf_disconnect();
++fail_free_cache:
++	kmem_cache_destroy(vboxsf_inode_cachep);
++fail_nomem:
++	mutex_unlock(&vboxsf_setup_mutex);
++	return err;
++}
++
++static int vboxsf_parse_monolithic(struct fs_context *fc, void *data)
++{
++	char *options = data;
++
++	if (options && options[0] == VBSF_MOUNT_SIGNATURE_BYTE_0 &&
++		       options[1] == VBSF_MOUNT_SIGNATURE_BYTE_1 &&
++		       options[2] == VBSF_MOUNT_SIGNATURE_BYTE_2 &&
++		       options[3] == VBSF_MOUNT_SIGNATURE_BYTE_3) {
++		vbg_err("vboxsf: Old binary mount data not supported, remove obsolete mount.vboxsf and/or update your VBoxService.\n");
++		return -EINVAL;
++	}
++
++	return generic_parse_monolithic(fc, data);
++}
++
++static int vboxsf_get_tree(struct fs_context *fc)
++{
++	int err;
++
++	err = vboxsf_setup();
++	if (err)
++		return err;
++
++	return get_tree_nodev(fc, vboxsf_fill_super);
++}
++
++static int vboxsf_reconfigure(struct fs_context *fc)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(fc->root->d_sb);
++	struct vboxsf_fs_context *ctx = fc->fs_private;
++	struct inode *iroot = fc->root->d_sb->s_root->d_inode;
++
++	/* Apply changed options to the root inode */
++	sbi->o = ctx->o;
++	vboxsf_init_inode(sbi, iroot, &sbi->root_info);
++
++	return 0;
++}
++
++static void vboxsf_free_fc(struct fs_context *fc)
++{
++	struct vboxsf_fs_context *ctx = fc->fs_private;
++
++	kfree(ctx->nls_name);
++	kfree(ctx);
++}
++
++static const struct fs_context_operations vboxsf_context_ops = {
++	.free			= vboxsf_free_fc,
++	.parse_param		= vboxsf_parse_param,
++	.parse_monolithic	= vboxsf_parse_monolithic,
++	.get_tree		= vboxsf_get_tree,
++	.reconfigure		= vboxsf_reconfigure,
++};
++
++static int vboxsf_init_fs_context(struct fs_context *fc)
++{
++	struct vboxsf_fs_context *ctx;
++
++	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
++	if (!ctx)
++		return -ENOMEM;
++
++	current_uid_gid(&ctx->o.uid, &ctx->o.gid);
++
++	fc->fs_private = ctx;
++	fc->ops = &vboxsf_context_ops;
++	return 0;
++}
++
++static struct file_system_type vboxsf_fs_type = {
++	.owner			= THIS_MODULE,
++	.name			= "vboxsf",
++	.init_fs_context	= vboxsf_init_fs_context,
++	.parameters		= &vboxsf_fs_parameters,
++	.kill_sb		= kill_anon_super
++};
++
++/* Module initialization/finalization handlers */
++static int __init vboxsf_init(void)
++{
++	return register_filesystem(&vboxsf_fs_type);
++}
++
++static void __exit vboxsf_fini(void)
++{
++	unregister_filesystem(&vboxsf_fs_type);
++
++	mutex_lock(&vboxsf_setup_mutex);
++	if (vboxsf_setup_done) {
++		vboxsf_disconnect();
++		/*
++		 * Make sure all delayed rcu free inodes are flushed
++		 * before we destroy the cache.
++		 */
++		rcu_barrier();
++		kmem_cache_destroy(vboxsf_inode_cachep);
++	}
++	mutex_unlock(&vboxsf_setup_mutex);
++}
++
++module_init(vboxsf_init);
++module_exit(vboxsf_fini);
++
++MODULE_DESCRIPTION("Oracle VM VirtualBox Module for Host File System Access");
++MODULE_AUTHOR("Oracle Corporation");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS_FS("vboxsf");
+diff --git a/fs/vboxsf/utils.c b/fs/vboxsf/utils.c
+new file mode 100644
+index 000000000000..96bd160da48b
+--- /dev/null
++++ b/fs/vboxsf/utils.c
+@@ -0,0 +1,551 @@
++// SPDX-License-Identifier: MIT
++/*
++ * VirtualBox Guest Shared Folders support: Utility functions.
++ * Mainly conversion from/to VirtualBox/Linux data structures.
++ *
++ * Copyright (C) 2006-2018 Oracle Corporation
++ */
++
++#include <linux/namei.h>
++#include <linux/nls.h>
++#include <linux/sizes.h>
++#include <linux/vfs.h>
++#include "vfsmod.h"
++
++struct inode *vboxsf_new_inode(struct super_block *sb)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(sb);
++	struct inode *inode;
++	unsigned long flags;
++	int cursor, ret;
++	u32 gen;
++
++	inode = new_inode(sb);
++	if (!inode)
++		return ERR_PTR(-ENOMEM);
++
++	idr_preload(GFP_KERNEL);
++	spin_lock_irqsave(&sbi->ino_idr_lock, flags);
++	cursor = idr_get_cursor(&sbi->ino_idr);
++	ret = idr_alloc_cyclic(&sbi->ino_idr, inode, 1, 0, GFP_ATOMIC);
++	if (ret >= 0 && ret < cursor)
++		sbi->next_generation++;
++	gen = sbi->next_generation;
++	spin_unlock_irqrestore(&sbi->ino_idr_lock, flags);
++	idr_preload_end();
++
++	if (ret < 0) {
++		iput(inode);
++		return ERR_PTR(ret);
++	}
++
++	inode->i_ino = ret;
++	inode->i_generation = gen;
++	return inode;
++}
++
++/* set [inode] attributes based on [info], uid/gid based on [sbi] */
++void vboxsf_init_inode(struct vboxsf_sbi *sbi, 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(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
++
++	/* We use the host-side values for these */
++	inode->i_flags |= S_NOATIME | S_NOCMTIME;
++	inode->i_mapping->a_ops = &vboxsf_reg_aops;
++
++	if (SHFL_IS_DIRECTORY(attr->mode)) {
++		inode->i_mode = sbi->o.dmode_set ? sbi->o.dmode : mode;
++		inode->i_mode &= ~sbi->o.dmask;
++		inode->i_mode |= S_IFDIR;
++		inode->i_op = &vboxsf_dir_iops;
++		inode->i_fop = &vboxsf_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 = sbi->o.fmode_set ? sbi->o.fmode : mode;
++		inode->i_mode &= ~sbi->o.fmask;
++		inode->i_mode |= S_IFLNK;
++		inode->i_op = &vboxsf_lnk_iops;
++		set_nlink(inode, 1);
++	} else {
++		inode->i_mode = sbi->o.fmode_set ? sbi->o.fmode : mode;
++		inode->i_mode &= ~sbi->o.fmask;
++		inode->i_mode |= S_IFREG;
++		inode->i_op = &vboxsf_reg_iops;
++		inode->i_fop = &vboxsf_reg_fops;
++		set_nlink(inode, 1);
++	}
++
++	inode->i_uid = sbi->o.uid;
++	inode->i_gid = sbi->o.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;
++
++	inode->i_atime = ns_to_timespec64(
++				 info->access_time.ns_relative_to_unix_epoch);
++	inode->i_ctime = ns_to_timespec64(
++				 info->change_time.ns_relative_to_unix_epoch);
++	inode->i_mtime = ns_to_timespec64(
++			   info->modification_time.ns_relative_to_unix_epoch);
++}
++
++int vboxsf_create_at_dentry(struct dentry *dentry,
++			    struct shfl_createparms *params)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);
++	struct shfl_string *path;
++	int err;
++
++	path = vboxsf_path_from_dentry(sbi, dentry);
++	if (IS_ERR(path))
++		return PTR_ERR(path);
++
++	err = vboxsf_create(sbi->root, path, params);
++	__putname(path);
++
++	return err;
++}
++
++int vboxsf_stat(struct vboxsf_sbi *sbi, struct shfl_string *path,
++		struct shfl_fsobjinfo *info)
++{
++	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(sbi->root, path, &params);
++	if (err)
++		return err;
++
++	if (params.result != SHFL_FILE_EXISTS)
++		return -ENOENT;
++
++	if (info)
++		*info = params.info;
++
++	return 0;
++}
++
++int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info)
++{
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);
++	struct shfl_string *path;
++	int err;
++
++	path = vboxsf_path_from_dentry(sbi, dentry);
++	if (IS_ERR(path))
++		return PTR_ERR(path);
++
++	err = vboxsf_stat(sbi, path, info);
++	__putname(path);
++	return err;
++}
++
++int vboxsf_inode_revalidate(struct dentry *dentry)
++{
++	struct vboxsf_sbi *sbi;
++	struct vboxsf_inode *sf_i;
++	struct shfl_fsobjinfo info;
++	struct timespec64 prev_mtime;
++	struct inode *inode;
++	int err;
++
++	if (!dentry || !d_really_is_positive(dentry))
++		return -EINVAL;
++
++	inode = d_inode(dentry);
++	prev_mtime = inode->i_mtime;
++	sf_i = VBOXSF_I(inode);
++	sbi = VBOXSF_SBI(dentry->d_sb);
++	if (!sf_i->force_restat) {
++		if (time_before(jiffies, dentry->d_time + sbi->o.ttl))
++			return 0;
++	}
++
++	err = vboxsf_stat_dentry(dentry, &info);
++	if (err)
++		return err;
++
++	dentry->d_time = jiffies;
++	sf_i->force_restat = 0;
++	vboxsf_init_inode(sbi, inode, &info);
++
++	/*
++	 * If the file was changed on the host side we need to invalidate the
++	 * page-cache for it.  Note this also gets triggered by our own writes,
++	 * this is unavoidable.
++	 */
++	if (timespec64_compare(&inode->i_mtime, &prev_mtime) > 0)
++		invalidate_inode_pages2(inode->i_mapping);
++
++	return 0;
++}
++
++int vboxsf_getattr(const struct path *path, struct kstat *kstat,
++		   u32 request_mask, unsigned int flags)
++{
++	int err;
++	struct dentry *dentry = path->dentry;
++	struct inode *inode = d_inode(dentry);
++	struct vboxsf_inode *sf_i = VBOXSF_I(inode);
++
++	switch (flags & AT_STATX_SYNC_TYPE) {
++	case AT_STATX_DONT_SYNC:
++		err = 0;
++		break;
++	case AT_STATX_FORCE_SYNC:
++		sf_i->force_restat = 1;
++		/* fall-through */
++	default:
++		err = vboxsf_inode_revalidate(dentry);
++	}
++	if (err)
++		return err;
++
++	generic_fillattr(d_inode(dentry), kstat);
++	return 0;
++}
++
++int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr)
++{
++	struct vboxsf_inode *sf_i = VBOXSF_I(d_inode(dentry));
++	struct vboxsf_sbi *sbi = VBOXSF_SBI(dentry->d_sb);
++	struct shfl_createparms params = {};
++	struct shfl_fsobjinfo info = {};
++	u32 buf_len;
++	int err;
++
++	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_at_dentry(dentry, &params);
++	if (err || params.result != SHFL_FILE_EXISTS)
++		return err ? err : -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(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)
++			info.access_time.ns_relative_to_unix_epoch =
++					    timespec64_to_ns(&iattr->ia_atime);
++
++		if (iattr->ia_valid & ATTR_MTIME)
++			info.modification_time.ns_relative_to_unix_epoch =
++					    timespec64_to_ns(&iattr->ia_mtime);
++
++		/*
++		 * Ignore ctime (inode change time) as it can't be set
++		 * from userland anyway.
++		 */
++
++		buf_len = sizeof(info);
++		err = vboxsf_fsinfo(sbi->root, params.handle,
++				    SHFL_INFO_SET | SHFL_INFO_FILE, &buf_len,
++				    &info);
++		if (err) {
++			vboxsf_close(sbi->root, params.handle);
++			return err;
++		}
++
++		/* the host may have given us different attr then requested */
++		sf_i->force_restat = 1;
++	}
++
++#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(sbi->root, params.handle,
++				    SHFL_INFO_SET | SHFL_INFO_SIZE, &buf_len,
++				    &info);
++		if (err) {
++			vboxsf_close(sbi->root, params.handle);
++			return err;
++		}
++
++		/* the host may have given us different attr then requested */
++		sf_i->force_restat = 1;
++	}
++
++	vboxsf_close(sbi->root, params.handle);
++
++	/* Update the inode with what the host has actually given us. */
++	if (sf_i->force_restat)
++		vboxsf_inode_revalidate(dentry);
++
++	return 0;
++}
++
++/*
++ * [dentry] contains string encoded in coding system that corresponds
++ * to [sbi]->nls, we must convert it to UTF8 here.
++ * Returns a shfl_string allocated through __getname (must be freed using
++ * __putname), or an ERR_PTR on error.
++ */
++struct shfl_string *vboxsf_path_from_dentry(struct vboxsf_sbi *sbi,
++					    struct dentry *dentry)
++{
++	struct shfl_string *shfl_path;
++	int path_len, out_len, nb;
++	char *buf, *path;
++	wchar_t uni;
++	u8 *out;
++
++	buf = __getname();
++	if (!buf)
++		return ERR_PTR(-ENOMEM);
++
++	path = dentry_path_raw(dentry, buf, PATH_MAX);
++	if (IS_ERR(path)) {
++		__putname(buf);
++		return ERR_CAST(path);
++	}
++	path_len = strlen(path);
++
++	if (sbi->nls) {
++		shfl_path = __getname();
++		if (!shfl_path) {
++			__putname(buf);
++			return ERR_PTR(-ENOMEM);
++		}
++
++		out = shfl_path->string.utf8;
++		out_len = PATH_MAX - SHFLSTRING_HEADER_SIZE - 1;
++
++		while (path_len) {
++			nb = sbi->nls->char2uni(path, path_len, &uni);
++			if (nb < 0) {
++				__putname(shfl_path);
++				__putname(buf);
++				return ERR_PTR(-EINVAL);
++			}
++			path += nb;
++			path_len -= nb;
++
++			nb = utf32_to_utf8(uni, out, out_len);
++			if (nb < 0) {
++				__putname(shfl_path);
++				__putname(buf);
++				return ERR_PTR(-ENAMETOOLONG);
++			}
++			out += nb;
++			out_len -= nb;
++		}
++		*out = 0;
++		shfl_path->length = out - shfl_path->string.utf8;
++		shfl_path->size = shfl_path->length + 1;
++		__putname(buf);
++	} else {
++		if ((SHFLSTRING_HEADER_SIZE + path_len + 1) > PATH_MAX) {
++			__putname(buf);
++			return ERR_PTR(-ENAMETOOLONG);
++		}
++		/*
++		 * dentry_path stores the name at the end of buf, but the
++		 * shfl_string string we return must be properly aligned.
++		 */
++		shfl_path = (struct shfl_string *)buf;
++		memmove(shfl_path->string.utf8, path, path_len);
++		shfl_path->string.utf8[path_len] = 0;
++		shfl_path->length = path_len;
++		shfl_path->size = path_len + 1;
++	}
++
++	return shfl_path;
++}
++
++int vboxsf_nlscpy(struct vboxsf_sbi *sbi, char *name, size_t name_bound_len,
++		  const unsigned char *utf8_name, size_t utf8_len)
++{
++	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;
++	/* Reserve space for terminating 0 */
++	out_bound_len = name_bound_len - 1;
++
++	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 = sbi->nls->uni2char(uni, out, out_bound_len);
++		if (nb < 0)
++			return nb;
++
++		out += nb;
++		out_bound_len -= nb;
++		out_len += nb;
++	}
++
++	*out = 0;
++
++	return 0;
++}
++
++static struct vboxsf_dir_buf *vboxsf_dir_buf_alloc(struct list_head *list)
++{
++	struct vboxsf_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;
++	}
++
++	b->entries = 0;
++	b->used = 0;
++	b->free = DIR_BUFFER_SIZE;
++	list_add(&b->head, list);
++
++	return b;
++}
++
++static void vboxsf_dir_buf_free(struct vboxsf_dir_buf *b)
++{
++	list_del(&b->head);
++	kfree(b->buf);
++	kfree(b);
++}
++
++struct vboxsf_dir_info *vboxsf_dir_info_alloc(void)
++{
++	struct vboxsf_dir_info *p;
++
++	p = kmalloc(sizeof(*p), GFP_KERNEL);
++	if (!p)
++		return NULL;
++
++	INIT_LIST_HEAD(&p->info_list);
++	return p;
++}
++
++void vboxsf_dir_info_free(struct vboxsf_dir_info *p)
++{
++	struct list_head *list, *pos, *tmp;
++
++	list = &p->info_list;
++	list_for_each_safe(pos, tmp, list) {
++		struct vboxsf_dir_buf *b;
++
++		b = list_entry(pos, struct vboxsf_dir_buf, head);
++		vboxsf_dir_buf_free(b);
++	}
++	kfree(p);
++}
++
++int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,
++			u64 handle)
++{
++	struct vboxsf_dir_buf *b;
++	u32 entries, size;
++	int err = 0;
++	void *buf;
++
++	/* vboxsf_dirinfo returns 1 on end of dir */
++	while (err == 0) {
++		b = vboxsf_dir_buf_alloc(&sf_d->info_list);
++		if (!b) {
++			err = -ENOMEM;
++			break;
++		}
++
++		buf = b->buf;
++		size = b->free;
++
++		err = vboxsf_dirinfo(sbi->root, handle, NULL, 0, 0,
++				     &size, buf, &entries);
++		if (err < 0)
++			break;
++
++		b->entries += entries;
++		b->free -= size;
++		b->used += size;
++	}
++
++	if (b && b->used == 0)
++		vboxsf_dir_buf_free(b);
++
++	/* -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..bfc78a097dae
+--- /dev/null
++++ b/fs/vboxsf/vboxsf_wrappers.c
+@@ -0,0 +1,371 @@
++// SPDX-License-Identifier: MIT
++/*
++ * Wrapper functions for the shfl host calls.
++ *
++ * Copyright (C) 2006-2018 Oracle Corporation
++ */
++
++#include <linux/mm.h>
++#include <linux/slab.h>
++#include <linux/vbox_err.h>
++#include <linux/vbox_utils.h>
++#include "vfsmod.h"
++
++#define SHFL_REQUEST \
++	(VMMDEV_REQUESTOR_KERNEL | VMMDEV_REQUESTOR_USR_DRV_OTHER | \
++	 VMMDEV_REQUESTOR_CON_DONT_KNOW | VMMDEV_REQUESTOR_TRUST_NOT_GIVEN)
++
++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 -ENODEV;	/* No guest-device */
++
++	err = vbg_hgcm_connect(gdev, SHFL_REQUEST, &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, SHFL_REQUEST, 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 -ESHUTDOWN; /* guest-dev removed underneath us */
++
++	err = vbg_hgcm_call(gdev, SHFL_REQUEST, 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);
++}
++
++/**
++ * vboxsf_create - Create a new file or folder
++ * @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.
++ *
++ * 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.
++ *
++ * Returns:
++ * 0 or negative errno value.
++ */
++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)
++{
++	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;
++	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, u8 *buf)
++{
++	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;
++	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;
++	if (parsed_path) {
++		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;
++	} else {
++		parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_IN;
++		parms.path.u.pointer.size = 0;
++		parms.path.u.pointer.u.linear_addr = 0;
++	}
++
++	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/vfsmod.h b/fs/vboxsf/vfsmod.h
+new file mode 100644
+index 000000000000..18f95b00fc33
+--- /dev/null
++++ b/fs/vboxsf/vfsmod.h
+@@ -0,0 +1,137 @@
++/* SPDX-License-Identifier: MIT */
++/*
++ * VirtualBox Guest Shared Folders support: module header.
++ *
++ * Copyright (C) 2006-2018 Oracle Corporation
++ */
++
++#ifndef VFSMOD_H
++#define VFSMOD_H
++
++#include <linux/backing-dev.h>
++#include <linux/idr.h>
++#include "shfl_hostintf.h"
++
++#define DIR_BUFFER_SIZE SZ_16K
++
++/* The cast is to prevent assignment of void * to pointers of arbitrary type */
++#define VBOXSF_SBI(sb)	((struct vboxsf_sbi *)(sb)->s_fs_info)
++#define VBOXSF_I(i)	container_of(i, struct vboxsf_inode, vfs_inode)
++
++struct vboxsf_options {
++	unsigned long ttl;
++	kuid_t uid;
++	kgid_t gid;
++	bool dmode_set;
++	bool fmode_set;
++	umode_t dmode;
++	umode_t fmode;
++	umode_t dmask;
++	umode_t fmask;
++};
++
++struct vboxsf_fs_context {
++	struct vboxsf_options o;
++	char *nls_name;
++};
++
++/* per-shared folder information */
++struct vboxsf_sbi {
++	struct vboxsf_options o;
++	struct shfl_fsobjinfo root_info;
++	struct idr ino_idr;
++	spinlock_t ino_idr_lock; /* This protects ino_idr */
++	struct nls_table *nls;
++	u32 next_generation;
++	u32 root;
++	int bdi_id;
++};
++
++/* per-inode information */
++struct vboxsf_inode {
++	/* some information was changed, update data on next revalidate */
++	int force_restat;
++	/* list of open handles for this inode + lock protecting it */
++	struct list_head handle_list;
++	/* This mutex protects handle_list accesses */
++	struct mutex handle_list_mutex;
++	/* The VFS inode struct */
++	struct inode vfs_inode;
++};
++
++struct vboxsf_dir_info {
++	struct list_head info_list;
++};
++
++struct vboxsf_dir_buf {
++	size_t entries;
++	size_t free;
++	size_t used;
++	void *buf;
++	struct list_head head;
++};
++
++/* globals */
++extern const struct inode_operations vboxsf_dir_iops;
++extern const struct inode_operations vboxsf_lnk_iops;
++extern const struct inode_operations vboxsf_reg_iops;
++extern const struct file_operations vboxsf_dir_fops;
++extern const struct file_operations vboxsf_reg_fops;
++extern const struct address_space_operations vboxsf_reg_aops;
++extern const struct dentry_operations vboxsf_dentry_ops;
++
++/* from utils.c */
++struct inode *vboxsf_new_inode(struct super_block *sb);
++void vboxsf_init_inode(struct vboxsf_sbi *sbi, struct inode *inode,
++		       const struct shfl_fsobjinfo *info);
++int vboxsf_create_at_dentry(struct dentry *dentry,
++			    struct shfl_createparms *params);
++int vboxsf_stat(struct vboxsf_sbi *sbi, struct shfl_string *path,
++		struct shfl_fsobjinfo *info);
++int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info);
++int vboxsf_inode_revalidate(struct dentry *dentry);
++int vboxsf_getattr(const struct path *path, struct kstat *kstat,
++		   u32 request_mask, unsigned int query_flags);
++int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr);
++struct shfl_string *vboxsf_path_from_dentry(struct vboxsf_sbi *sbi,
++					    struct dentry *dentry);
++int vboxsf_nlscpy(struct vboxsf_sbi *sbi, char *name, size_t name_bound_len,
++		  const unsigned char *utf8_name, size_t utf8_len);
++struct vboxsf_dir_info *vboxsf_dir_info_alloc(void);
++void vboxsf_dir_info_free(struct vboxsf_dir_info *p);
++int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,
++			u64 handle);
++
++/* from vboxsf_wrappers.c */
++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);
++int vboxsf_write(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
++
++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
+-- 
+2.25.0
+