[RFC v2 2/2] fs: Add VirtualBox guest shared folder (vboxsf) support

From: Hans de Goede
Date: Fri Aug 25 2017 - 10:38:31 EST

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

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

Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
fs/Kconfig | 1 +
fs/Makefile | 1 +
fs/vboxsf/Kconfig | 9 +
fs/vboxsf/Makefile | 3 +
fs/vboxsf/dirops.c | 705 ++++++++++++++++++++++
fs/vboxsf/lnkops.c | 37 ++
fs/vboxsf/regops.c | 558 +++++++++++++++++
fs/vboxsf/shfl_hostintf.h | 1283 ++++++++++++++++++++++++++++++++++++++++
fs/vboxsf/utils.c | 674 +++++++++++++++++++++
fs/vboxsf/vboxsf_wrappers.c | 519 ++++++++++++++++
fs/vboxsf/vboxsf_wrappers.h | 98 +++
fs/vboxsf/vfsmod.c | 386 ++++++++++++
fs/vboxsf/vfsmod.h | 113 ++++
include/uapi/linux/vbsfmount.h | 62 ++
14 files changed, 4449 insertions(+)
create mode 100644 fs/vboxsf/Kconfig
create mode 100644 fs/vboxsf/Makefile
create mode 100644 fs/vboxsf/dirops.c
create mode 100644 fs/vboxsf/lnkops.c
create mode 100644 fs/vboxsf/regops.c
create mode 100644 fs/vboxsf/shfl_hostintf.h
create mode 100644 fs/vboxsf/utils.c
create mode 100644 fs/vboxsf/vboxsf_wrappers.c
create mode 100644 fs/vboxsf/vboxsf_wrappers.h
create mode 100644 fs/vboxsf/vfsmod.c
create mode 100644 fs/vboxsf/vfsmod.h
create mode 100644 include/uapi/linux/vbsfmount.h

diff --git a/fs/Kconfig b/fs/Kconfig
index 7aee6d699fd6..7f80ad1cf591 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -248,6 +248,7 @@ source "fs/pstore/Kconfig"
source "fs/sysv/Kconfig"
source "fs/ufs/Kconfig"
source "fs/exofs/Kconfig"
+source "fs/vboxsf/Kconfig"

endif # MISC_FILESYSTEMS

diff --git a/fs/Makefile b/fs/Makefile
index 7bbaca9c67b1..6b5039e3ade5 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -128,3 +128,4 @@ obj-y += exofs/ # Multiple modules
obj-$(CONFIG_CEPH_FS) += ceph/
obj-$(CONFIG_PSTORE) += pstore/
obj-$(CONFIG_EFIVAR_FS) += efivarfs/
+obj-$(CONFIG_VBOXSF_FS) += vboxsf/
diff --git a/fs/vboxsf/Kconfig b/fs/vboxsf/Kconfig
new file mode 100644
index 000000000000..620e2232969c
--- /dev/null
+++ b/fs/vboxsf/Kconfig
@@ -0,0 +1,9 @@
+config VBOXSF_FS
+ tristate "VirtualBox guest shared folder (vboxsf) support"
+ depends on VBOXGUEST
+ help
+ VirtualBox hosts can share folders with guests, this driver
+ implements the Linux-guest side of this allowing folders exported
+ by the host to be mounted under Linux.
+
+ If you want to use shared folders in VirtualBox guests, answer Y or M.
diff --git a/fs/vboxsf/Makefile b/fs/vboxsf/Makefile
new file mode 100644
index 000000000000..f3529ea02d5c
--- /dev/null
+++ b/fs/vboxsf/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_VBOXSF_FS) += vboxsf.o
+
+vboxsf-objs := dirops.o lnkops.o regops.o utils.o vboxsf_wrappers.o vfsmod.o
diff --git a/fs/vboxsf/dirops.c b/fs/vboxsf/dirops.c
new file mode 100644
index 000000000000..20b9a5b14dbb
--- /dev/null
+++ b/fs/vboxsf/dirops.c
@@ -0,0 +1,705 @@
+/*
+ * VirtualBox Guest Shared Folders support: Directory inode and file operations
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/vbox_err.h>
+#include <linux/vbox_utils.h>
+#include "vfsmod.h"
+
+/**
+ * Open a directory. Read the complete content into a buffer.
+ *
+ * @param inode inode
+ * @param file file
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_dir_open(struct inode *inode, struct file *file)
+{
+ int rc;
+ int err;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_dir_info *sf_d;
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+ struct shfl_createparms params = {};
+
+ if (file->private_data)
+ return 0;
+
+ sf_d = sf_dir_info_alloc();
+ if (!sf_d)
+ return -ENOMEM;
+
+ params.handle = SHFL_HANDLE_NIL;
+ params.create_flags = 0
+ | SHFL_CF_DIRECTORY
+ | SHFL_CF_ACT_OPEN_IF_EXISTS
+ | SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
+
+ rc = vboxsf_create(sf_g->root, sf_i->path, &params);
+ if (rc >= 0) {
+ if (params.result == SHFL_FILE_EXISTS) {
+ err = sf_dir_read_all(sf_g, sf_i, sf_d, params.handle);
+ if (!err)
+ file->private_data = sf_d;
+ } else
+ err = -ENOENT;
+
+ vboxsf_close(sf_g->root, params.handle);
+ } else
+ err = -EPERM;
+
+ if (err)
+ sf_dir_info_free(sf_d);
+
+ return err;
+}
+
+/**
+ * This is called when reference count of [file] goes to zero. Notify
+ * the host that it can free whatever is associated with this directory
+ * and deallocate our own internal buffers
+ *
+ * @param inode inode
+ * @param file file
+ * returns 0 on success, Linux error code otherwise
+ */
+static int sf_dir_release(struct inode *inode, struct file *file)
+{
+ if (file->private_data)
+ sf_dir_info_free(file->private_data);
+
+ return 0;
+}
+
+/**
+ * Translate RTFMODE into DT_xxx (in conjunction to rtDirType())
+ * @param mode file mode
+ * returns d_type
+ */
+static int sf_get_d_type(u32 mode)
+{
+ int d_type;
+
+ switch (mode & SHFL_TYPE_MASK) {
+ case SHFL_TYPE_FIFO:
+ d_type = DT_FIFO;
+ break;
+ case SHFL_TYPE_DEV_CHAR:
+ d_type = DT_CHR;
+ break;
+ case SHFL_TYPE_DIRECTORY:
+ d_type = DT_DIR;
+ break;
+ case SHFL_TYPE_DEV_BLOCK:
+ d_type = DT_BLK;
+ break;
+ case SHFL_TYPE_FILE:
+ d_type = DT_REG;
+ break;
+ case SHFL_TYPE_SYMLINK:
+ d_type = DT_LNK;
+ break;
+ case SHFL_TYPE_SOCKET:
+ d_type = DT_SOCK;
+ break;
+ case SHFL_TYPE_WHITEOUT:
+ d_type = DT_WHT;
+ break;
+ default:
+ d_type = DT_UNKNOWN;
+ break;
+ }
+ return d_type;
+}
+
+/**
+ * Extract element ([dir]->f_pos) from the directory [dir] into [d_name].
+ *
+ * @returns 0 for success, 1 for end reached, Linux error code otherwise.
+ */
+static int sf_getdent(struct file *dir, char d_name[NAME_MAX], int *d_type)
+{
+ loff_t cur;
+ struct sf_glob_info *sf_g;
+ struct sf_dir_info *sf_d;
+ struct sf_inode_info *sf_i;
+ struct inode *inode;
+ struct list_head *pos, *list;
+
+ inode = GET_F_DENTRY(dir)->d_inode;
+ sf_i = GET_INODE_INFO(inode);
+ sf_g = GET_GLOB_INFO(inode->i_sb);
+ sf_d = dir->private_data;
+
+ if (sf_i->force_reread) {
+ int rc;
+ int err;
+ struct shfl_createparms params = {};
+
+ params.handle = SHFL_HANDLE_NIL;
+ params.create_flags = 0
+ | SHFL_CF_DIRECTORY
+ | SHFL_CF_ACT_OPEN_IF_EXISTS
+ | SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
+
+ rc = vboxsf_create(sf_g->root, sf_i->path, &params);
+ if (rc < 0)
+ return -EPERM;
+
+ if (params.result != SHFL_FILE_EXISTS) {
+ sf_dir_info_free(sf_d);
+ return -ENOENT;
+ }
+
+ sf_dir_info_empty(sf_d);
+ err = sf_dir_read_all(sf_g, sf_i, sf_d, params.handle);
+ vboxsf_close(sf_g->root, params.handle);
+ if (err)
+ return err;
+
+ sf_i->force_reread = 0;
+ }
+
+ cur = 0;
+ list = &sf_d->info_list;
+ list_for_each(pos, list) {
+ struct sf_dir_buf *b;
+ struct shfl_dirinfo *info;
+ loff_t i;
+
+ b = list_entry(pos, struct sf_dir_buf, head);
+ if (dir->f_pos >= cur + b->entries) {
+ cur += b->entries;
+ continue;
+ }
+
+ for (i = 0, info = b->buf; i < dir->f_pos - cur; ++i) {
+ size_t size;
+
+ size = offsetof(struct shfl_dirinfo, name.string) +
+ info->name.size;
+ info = (struct shfl_dirinfo *)((uintptr_t) info + size);
+ }
+
+ *d_type = sf_get_d_type(info->info.attr.mode);
+
+ return sf_nlscpy(sf_g, d_name, NAME_MAX,
+ info->name.string.utf8, info->name.length);
+ }
+
+ return 1;
+}
+
+/**
+ * This is called when vfs wants to populate internal buffers with
+ * directory [dir]s contents. [opaque] is an argument to the
+ * [filldir]. [filldir] magically modifies it's argument - [opaque]
+ * and takes following additional arguments (which i in turn get from
+ * the host via sf_getdent):
+ *
+ * name : name of the entry (i must also supply it's length huh?)
+ * type : type of the entry (FILE | DIR | etc) (i ellect to use DT_UNKNOWN)
+ * pos : position/index of the entry
+ * ino : inode number of the entry (i fake those)
+ *
+ * [dir] contains:
+ * f_pos : cursor into the directory listing
+ * private_data : mean of communication with the host side
+ *
+ * Extract elements from the directory listing (incrementing f_pos
+ * along the way) and feed them to [filldir] until:
+ *
+ * a. there are no more entries (i.e. sf_getdent set done to 1)
+ * b. failure to compute fake inode number
+ * c. filldir returns an error (see comment on that)
+ */
+static int sf_dir_iterate(struct file *dir, struct dir_context *ctx)
+{
+ for (;;) {
+ int err;
+ ino_t fake_ino;
+ loff_t sanity;
+ char d_name[NAME_MAX];
+ int d_type = DT_UNKNOWN;
+
+ err = sf_getdent(dir, d_name, &d_type);
+ switch (err) {
+ case 1:
+ return 0;
+
+ case 0:
+ break;
+
+ case -1:
+ default:
+ /* skip erroneous entry and proceed */
+ dir->f_pos += 1;
+ ctx->pos += 1;
+ continue;
+ }
+
+ /* d_name now contains a valid entry name */
+ sanity = ctx->pos + 0xbeef;
+ fake_ino = sanity;
+ /*
+ * On 32 bit systems pos is 64 signed, while ino is 32 bit
+ * unsigned so fake_ino may overflow, check for this.
+ */
+ if (sanity - fake_ino) {
+ vbg_err("vboxsf: can not compute ino\n");
+ return -EINVAL;
+ }
+ if (!dir_emit(ctx, d_name, strlen(d_name), fake_ino, d_type))
+ return 0;
+
+ dir->f_pos += 1;
+ ctx->pos += 1;
+ }
+}
+
+const struct file_operations sf_dir_fops = {
+ .open = sf_dir_open,
+ .iterate = sf_dir_iterate,
+ .release = sf_dir_release,
+ .read = generic_read_dir,
+ .llseek = generic_file_llseek,
+};
+
+/* iops */
+
+/**
+ * This is called when vfs failed to locate dentry in the cache. The
+ * job of this function is to allocate inode and link it to dentry.
+ * [dentry] contains the name to be looked in the [parent] directory.
+ * Failure to locate the name is not a "hard" error, in this case NULL
+ * inode is added to [dentry] and vfs should proceed trying to create
+ * the entry via other means. NULL(or "positive" pointer) ought to be
+ * returned in case of success and "negative" pointer on error
+ */
+static struct dentry *sf_lookup(struct inode *parent, struct dentry *dentry,
+ unsigned int flags)
+{
+ int err;
+ struct sf_inode_info *sf_i, *sf_new_i;
+ struct sf_glob_info *sf_g;
+ struct shfl_string *path;
+ struct inode *inode;
+ ino_t ino;
+ struct shfl_fsobjinfo fsinfo;
+
+ sf_g = GET_GLOB_INFO(parent->i_sb);
+ sf_i = GET_INODE_INFO(parent);
+
+ err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
+ if (err)
+ goto fail0;
+
+ err = sf_stat(__func__, sf_g, path, &fsinfo, 1);
+ if (err) {
+ if (err == -ENOENT) {
+ /*
+ * -ENOENT: add NULL inode to dentry so it later can
+ * be created via call to create/mkdir/open
+ */
+ kfree(path);
+ inode = NULL;
+ } else {
+ goto fail1;
+ }
+ } else {
+ sf_new_i = kmalloc(sizeof(*sf_new_i), GFP_KERNEL);
+ if (!sf_new_i) {
+ err = -ENOMEM;
+ goto fail1;
+ }
+ sf_new_i->handle = SHFL_HANDLE_NIL;
+ sf_new_i->force_reread = 0;
+
+ ino = iunique(parent->i_sb, 1);
+ inode = iget_locked(parent->i_sb, ino);
+ if (!inode) {
+ err = -ENOMEM; /* XXX: ??? */
+ goto fail2;
+ }
+
+ SET_INODE_INFO(inode, sf_new_i);
+ sf_init_inode(sf_g, inode, &fsinfo);
+ sf_new_i->path = path;
+
+ unlock_new_inode(inode);
+ }
+
+ sf_i->force_restat = 0;
+ dentry->d_time = jiffies;
+ d_set_d_op(dentry, &sf_dentry_ops);
+ d_add(dentry, inode);
+ return NULL;
+
+fail2:
+ kfree(sf_new_i);
+
+fail1:
+ kfree(path);
+
+fail0:
+ return ERR_PTR(err);
+}
+
+/**
+ * This should allocate memory for sf_inode_info, compute a unique inode
+ * number, get an inode from vfs, initialize inode info, instantiate
+ * dentry.
+ *
+ * @param parent inode entry of the directory
+ * @param dentry directory cache entry
+ * @param path path name
+ * @param info file information
+ * @param handle handle
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_instantiate(struct inode *parent, struct dentry *dentry,
+ struct shfl_string *path, struct shfl_fsobjinfo *info,
+ SHFLHANDLE handle)
+{
+ int err;
+ ino_t ino;
+ struct inode *inode;
+ struct sf_inode_info *sf_new_i;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+
+ sf_new_i = kmalloc(sizeof(*sf_new_i), GFP_KERNEL);
+ if (!sf_new_i) {
+ err = -ENOMEM;
+ goto fail0;
+ }
+
+ ino = iunique(parent->i_sb, 1);
+ inode = iget_locked(parent->i_sb, ino);
+ if (!inode) {
+ err = -ENOMEM;
+ goto fail1;
+ }
+
+ sf_init_inode(sf_g, inode, info);
+ sf_new_i->path = path;
+ SET_INODE_INFO(inode, sf_new_i);
+ sf_new_i->force_restat = 1;
+ sf_new_i->force_reread = 0;
+
+ d_instantiate(dentry, inode);
+ unlock_new_inode(inode);
+
+ /* Store this handle if we leave the handle open. */
+ sf_new_i->handle = handle;
+ return 0;
+
+fail1:
+ kfree(sf_new_i);
+
+fail0:
+ return err;
+
+}
+
+/**
+ * Create a new regular file / directory.
+ *
+ * @param parent inode of the directory
+ * @param dentry directory cache entry
+ * @param mode file mode
+ * @param fDirectory true if directory, false otherwise
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_create_aux(struct inode *parent, struct dentry *dentry,
+ umode_t mode, int fDirectory)
+{
+ int rc, err;
+ struct shfl_createparms params = {};
+ struct shfl_string *path;
+ struct sf_inode_info *sf_i = GET_INODE_INFO(parent);
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+
+ err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
+ if (err)
+ goto fail0;
+
+ params.handle = SHFL_HANDLE_NIL;
+ params.create_flags = 0
+ | SHFL_CF_ACT_CREATE_IF_NEW
+ | SHFL_CF_ACT_FAIL_IF_EXISTS
+ | SHFL_CF_ACCESS_READWRITE | (fDirectory ? SHFL_CF_DIRECTORY : 0);
+ params.info.attr.mode = 0
+ | (fDirectory ? SHFL_TYPE_DIRECTORY : SHFL_TYPE_FILE)
+ | (mode & 0777);
+ params.info.attr.additional = SHFLFSOBJATTRADD_NOTHING;
+
+ rc = vboxsf_create(sf_g->root, path, &params);
+ if (rc < 0) {
+ if (rc == VERR_WRITE_PROTECT) {
+ err = -EROFS;
+ goto fail1;
+ }
+ err = -EPROTO;
+ goto fail1;
+ }
+
+ if (params.result != SHFL_FILE_CREATED) {
+ err = -EPERM;
+ goto fail1;
+ }
+
+ err = sf_instantiate(parent, dentry, path, &params.info,
+ fDirectory ? SHFL_HANDLE_NIL : params.handle);
+ if (err)
+ goto fail2;
+
+ /*
+ * Don't close this handle right now. We assume that the same file is
+ * opened with sf_reg_open() and later closed with sf_reg_close(). Save
+ * the handle in between. Does not apply to directories. True?
+ */
+ if (fDirectory)
+ vboxsf_close(sf_g->root, params.handle);
+
+ sf_i->force_restat = 1;
+ return 0;
+
+fail2:
+ vboxsf_close(sf_g->root, params.handle);
+
+fail1:
+ kfree(path);
+
+fail0:
+ return err;
+}
+
+/**
+ * Create a new regular file.
+ *
+ * @param parent inode of the directory
+ * @param dentry directory cache entry
+ * @param mode file mode
+ * @param excl Possible O_EXCL...
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_create(struct inode *parent, struct dentry *dentry, umode_t mode,
+ bool excl)
+{
+ return sf_create_aux(parent, dentry, mode, 0);
+}
+
+/**
+ * Create a new directory.
+ *
+ * @param parent inode of the directory
+ * @param dentry directory cache entry
+ * @param mode file mode
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_mkdir(struct inode *parent, struct dentry *dentry, umode_t mode)
+{
+ return sf_create_aux(parent, dentry, mode, 1);
+}
+
+/**
+ * Remove a regular file / directory.
+ *
+ * @param parent inode of the directory
+ * @param dentry directory cache entry
+ * @param fDirectory true if directory, false otherwise
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_unlink_aux(struct inode *parent, struct dentry *dentry,
+ int fDirectory)
+{
+ int rc, err;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+ struct sf_inode_info *sf_i = GET_INODE_INFO(parent);
+ struct shfl_string *path;
+ uint32_t flags;
+
+ err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
+ if (err)
+ goto fail0;
+
+ flags = fDirectory ? SHFL_REMOVE_DIR : SHFL_REMOVE_FILE;
+ if (dentry
+ && dentry->d_inode
+ && ((dentry->d_inode->i_mode & S_IFLNK) == S_IFLNK))
+ flags |= SHFL_REMOVE_SYMLINK;
+ rc = vboxsf_remove(sf_g->root, path, flags);
+ if (rc < 0) {
+ err = vbg_status_code_to_errno(rc);
+ goto fail1;
+ }
+
+ /* directory access/change time changed */
+ sf_i->force_restat = 1;
+ /* directory content changed */
+ sf_i->force_reread = 1;
+
+ err = 0;
+
+fail1:
+ kfree(path);
+
+fail0:
+ return err;
+}
+
+/**
+ * Remove a regular file.
+ *
+ * @param parent inode of the directory
+ * @param dentry directory cache entry
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_unlink(struct inode *parent, struct dentry *dentry)
+{
+ return sf_unlink_aux(parent, dentry, 0);
+}
+
+/**
+ * Remove a directory.
+ *
+ * @param parent inode of the directory
+ * @param dentry directory cache entry
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_rmdir(struct inode *parent, struct dentry *dentry)
+{
+ return sf_unlink_aux(parent, dentry, 1);
+}
+
+/**
+ * Rename a regular file / directory.
+ *
+ * @param old_parent inode of the old parent directory
+ * @param old_dentry old directory cache entry
+ * @param new_parent inode of the new parent directory
+ * @param new_dentry new directory cache entry
+ * @param flags flags
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_rename(struct inode *old_parent, struct dentry *old_dentry,
+ struct inode *new_parent, struct dentry *new_dentry,
+ unsigned int flags)
+{
+ int err = 0, rc = VINF_SUCCESS;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(old_parent->i_sb);
+ u32 shfl_flags = SHFL_RENAME_FILE | SHFL_RENAME_REPLACE_IF_EXISTS;
+
+ if (flags)
+ return -EINVAL;
+
+ if (sf_g != GET_GLOB_INFO(new_parent->i_sb)) {
+ err = -EINVAL;
+ } else {
+ struct sf_inode_info *sf_old_i = GET_INODE_INFO(old_parent);
+ struct sf_inode_info *sf_new_i = GET_INODE_INFO(new_parent);
+ /*
+ * As we save the relative path inside the inode structure,
+ * we need to change this if the rename is successful.
+ */
+ struct sf_inode_info *sf_file_i =
+ GET_INODE_INFO(old_dentry->d_inode);
+ struct shfl_string *old_path;
+ struct shfl_string *new_path;
+
+ old_path = sf_file_i->path;
+ err = sf_path_from_dentry(__func__, sf_g, sf_new_i,
+ new_dentry, &new_path);
+ if (err == 0) {
+ if (old_dentry->d_inode->i_mode & S_IFDIR)
+ shfl_flags = 0;
+
+ rc = vboxsf_rename(sf_g->root, old_path, new_path,
+ shfl_flags);
+ if (rc >= 0) {
+ kfree(old_path);
+ sf_new_i->force_restat = 1;
+ sf_old_i->force_restat = 1; /* XXX: needed? */
+ /* Set the new relative path in the inode. */
+ sf_file_i->path = new_path;
+ } else {
+ err = vbg_status_code_to_errno(rc);
+ kfree(new_path);
+ }
+ }
+ }
+ return err;
+}
+
+static int sf_symlink(struct inode *parent, struct dentry *dentry,
+ const char *symname)
+{
+ int err;
+ int rc;
+ struct sf_inode_info *sf_i;
+ struct sf_glob_info *sf_g;
+ struct shfl_string *path, *ssymname;
+ struct shfl_fsobjinfo info;
+ int symname_len = strlen(symname) + 1;
+
+ sf_g = GET_GLOB_INFO(parent->i_sb);
+ sf_i = GET_INODE_INFO(parent);
+
+ err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
+ if (err)
+ goto fail0;
+
+ ssymname =
+ kmalloc(offsetof(struct shfl_string, string.utf8) + symname_len,
+ GFP_KERNEL);
+ if (!ssymname) {
+ err = -ENOMEM;
+ goto fail1;
+ }
+
+ ssymname->length = symname_len - 1;
+ ssymname->size = symname_len;
+ memcpy(ssymname->string.utf8, symname, symname_len);
+
+ rc = vboxsf_symlink(sf_g->root, path, ssymname, &info);
+ kfree(ssymname);
+
+ if (rc < 0) {
+ if (rc == VERR_WRITE_PROTECT) {
+ err = -EROFS;
+ goto fail1;
+ }
+ err = -EPROTO;
+ goto fail1;
+ }
+
+ err = sf_instantiate(parent, dentry, path, &info, SHFL_HANDLE_NIL);
+ if (err)
+ goto fail1;
+
+ sf_i->force_restat = 1;
+ return 0;
+
+fail1:
+ kfree(path);
+fail0:
+ return err;
+}
+
+const struct inode_operations sf_dir_iops = {
+ .lookup = sf_lookup,
+ .create = sf_create,
+ .mkdir = sf_mkdir,
+ .rmdir = sf_rmdir,
+ .unlink = sf_unlink,
+ .rename = sf_rename,
+ .getattr = sf_getattr,
+ .setattr = sf_setattr,
+ .symlink = sf_symlink
+};
diff --git a/fs/vboxsf/lnkops.c b/fs/vboxsf/lnkops.c
new file mode 100644
index 000000000000..da4cbfa3c886
--- /dev/null
+++ b/fs/vboxsf/lnkops.c
@@ -0,0 +1,37 @@
+/*
+ * VirtualBox Guest Shared Folders: Operations for symbolic links.
+ *
+ * Copyright (C) 2010-2016 Oracle Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "vfsmod.h"
+
+static const char *sf_get_link(struct dentry *dentry, struct inode *inode,
+ struct delayed_call *done)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+ char *path;
+ int rc;
+
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+ path = kzalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!path)
+ return ERR_PTR(-ENOMEM);
+ rc = vboxsf_readlink(sf_g->root, sf_i->path, PATH_MAX, path);
+ if (rc < 0) {
+ kfree(path);
+ return ERR_PTR(-EPROTO);
+ }
+ set_delayed_call(done, kfree_link, path);
+ return path;
+}
+
+const struct inode_operations sf_lnk_iops = {
+ .get_link = sf_get_link
+};
diff --git a/fs/vboxsf/regops.c b/fs/vboxsf/regops.c
new file mode 100644
index 000000000000..879793065f7e
--- /dev/null
+++ b/fs/vboxsf/regops.c
@@ -0,0 +1,558 @@
+/*
+ * VirtualBox Guest Shared Folders support: Regular file inode and file ops.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Limitations: only COW memory mapping is supported
+ */
+
+#include <linux/vbox_utils.h>
+#include "vfsmod.h"
+
+static void *alloc_bounce_buffer(size_t *tmp_sizep, u64 *physp, size_t
+ xfer_size, const char *caller)
+{
+ size_t tmp_size;
+ void *tmp;
+
+ /* try for big first. */
+ tmp_size = PAGE_ALIGN(xfer_size);
+ if (tmp_size > SZ_16K)
+ tmp_size = SZ_16K;
+ tmp = kmalloc(tmp_size, GFP_KERNEL);
+ if (!tmp) {
+ /* fall back on a page sized buffer. */
+ tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!tmp)
+ return NULL;
+ tmp_size = PAGE_SIZE;
+ }
+
+ *tmp_sizep = tmp_size;
+ *physp = virt_to_phys(tmp);
+ return tmp;
+}
+
+static void free_bounce_buffer(void *tmp)
+{
+ kfree(tmp);
+}
+
+/* fops */
+static int sf_reg_read_aux(const char *caller, struct sf_glob_info *sf_g,
+ struct sf_reg_info *sf_r, void *buf,
+ u32 *nread, u64 pos)
+{
+ int rc;
+
+ /**
+ * @todo bird: yes, kmap() and kmalloc() input only. Since the buffer is
+ * contiguous in physical memory (kmalloc or single page), we should
+ * use a physical address here to speed things up.
+ */
+ rc = vboxsf_read(sf_g->root, sf_r->handle, pos, nread, buf);
+ if (rc < 0)
+ return -EPROTO;
+
+ return 0;
+}
+
+static int sf_reg_write_aux(const char *caller, struct sf_glob_info *sf_g,
+ struct sf_reg_info *sf_r, void *buf,
+ u32 *nwritten, u64 pos)
+{
+ int rc;
+
+ /** @todo bird: see sf_reg_read_aux */
+ rc = vboxsf_write(sf_g->root, sf_r->handle, pos, nwritten, buf);
+ if (rc < 0)
+ return -EPROTO;
+
+ return 0;
+}
+
+/**
+ * Read from a regular file.
+ *
+ * @param file the file
+ * @param buf the buffer
+ * @param size length of the buffer
+ * @param off offset within the file
+ * @returns the number of read bytes on success, Linux error code otherwise
+ */
+static ssize_t sf_reg_read(struct file *file, char *buf, size_t size,
+ loff_t *off)
+{
+ int err;
+ void *tmp;
+ u64 tmp_phys;
+ size_t tmp_size;
+ size_t left = size;
+ ssize_t total_bytes_read = 0;
+ struct inode *inode = GET_F_DENTRY(file)->d_inode;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ loff_t pos = *off;
+
+ if (!S_ISREG(inode->i_mode))
+ return -EINVAL;
+
+ /** XXX Check read permission according to inode->i_mode! */
+
+ if (!size)
+ return 0;
+
+ tmp = alloc_bounce_buffer(&tmp_size, &tmp_phys, size,
+ __PRETTY_FUNCTION__);
+ if (!tmp)
+ return -ENOMEM;
+
+ while (left) {
+ u32 to_read, nread;
+
+ to_read = tmp_size;
+ if (to_read > left)
+ to_read = left;
+
+ nread = to_read;
+
+ err = sf_reg_read_aux(__func__, sf_g, sf_r, tmp, &nread, pos);
+ if (err)
+ goto fail;
+
+ if (copy_to_user(buf, tmp, nread)) {
+ err = -EFAULT;
+ goto fail;
+ }
+
+ pos += nread;
+ left -= nread;
+ buf += nread;
+ total_bytes_read += nread;
+ if (nread != to_read)
+ break;
+ }
+
+ *off += total_bytes_read;
+ free_bounce_buffer(tmp);
+ return total_bytes_read;
+
+fail:
+ free_bounce_buffer(tmp);
+ return err;
+}
+
+/**
+ * Write to a regular file.
+ *
+ * @param file the file
+ * @param buf the buffer
+ * @param size length of the buffer
+ * @param off offset within the file
+ * @returns the number of written bytes on success, Linux error code otherwise
+ */
+static ssize_t sf_reg_write(struct file *file, const char *buf, size_t size,
+ loff_t *off)
+{
+ int err;
+ void *tmp;
+ u64 tmp_phys;
+ size_t tmp_size;
+ size_t left = size;
+ ssize_t total_bytes_written = 0;
+ struct inode *inode = GET_F_DENTRY(file)->d_inode;
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ loff_t pos;
+
+ if (!S_ISREG(inode->i_mode))
+ return -EINVAL;
+
+ pos = *off;
+ if (file->f_flags & O_APPEND) {
+ pos = inode->i_size;
+ *off = pos;
+ }
+
+ /** XXX Check write permission according to inode->i_mode! */
+
+ if (!size)
+ return 0;
+
+ tmp =
+ alloc_bounce_buffer(&tmp_size, &tmp_phys, size,
+ __PRETTY_FUNCTION__);
+ if (!tmp)
+ return -ENOMEM;
+
+ while (left) {
+ u32 to_write, nwritten;
+
+ to_write = tmp_size;
+ if (to_write > left)
+ to_write = (u32) left;
+
+ nwritten = to_write;
+
+ if (copy_from_user(tmp, buf, to_write)) {
+ err = -EFAULT;
+ goto fail;
+ }
+
+ err = vboxsf_write_physcont(sf_g->root, sf_r->handle, pos,
+ &nwritten, tmp_phys);
+ if (err < 0) {
+ err = -EPROTO;
+ goto fail;
+ }
+
+ pos += nwritten;
+ left -= nwritten;
+ buf += nwritten;
+ total_bytes_written += nwritten;
+ if (nwritten != to_write)
+ break;
+ }
+
+ *off += total_bytes_written;
+ if (*off > inode->i_size)
+ inode->i_size = *off;
+
+ sf_i->force_restat = 1;
+ free_bounce_buffer(tmp);
+ return total_bytes_written;
+
+fail:
+ free_bounce_buffer(tmp);
+ return err;
+}
+
+/**
+ * Open a regular file.
+ *
+ * @param inode the inode
+ * @param file the file
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_reg_open(struct inode *inode, struct file *file)
+{
+ int rc, rc_linux = 0;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+ struct sf_reg_info *sf_r;
+ struct shfl_createparms params = {};
+
+ sf_r = kmalloc(sizeof(*sf_r), GFP_KERNEL);
+ if (!sf_r)
+ return -ENOMEM;
+
+ /* Already open? */
+ if (sf_i->handle != SHFL_HANDLE_NIL) {
+ /*
+ * This inode was created with sf_create_aux(). Check the
+ * create_flags: O_CREAT, O_TRUNC: inherent true (file was
+ * just created).
+ * Not sure about the access flags (SHFL_CF_ACCESS_*).
+ */
+ sf_i->force_restat = 1;
+ sf_r->handle = sf_i->handle;
+ sf_i->handle = SHFL_HANDLE_NIL;
+ sf_i->file = file;
+ file->private_data = sf_r;
+ return 0;
+ }
+
+ params.handle = SHFL_HANDLE_NIL;
+
+ /*
+ * We check the value of params.handle afterwards to find out if
+ * the call succeeded or failed, as the API does not seem to cleanly
+ * distinguish error and informational messages.
+ *
+ * Furthermore, we must set params.handle to SHFL_HANDLE_NIL to
+ * make the shared folders host service use our mode parameter.
+ */
+ if (file->f_flags & O_CREAT) {
+ params.create_flags |= SHFL_CF_ACT_CREATE_IF_NEW;
+ /*
+ * We ignore O_EXCL, as the Linux kernel seems to call create
+ * beforehand itself, so O_EXCL should always fail.
+ */
+ if (file->f_flags & O_TRUNC)
+ params.create_flags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
+ else
+ params.create_flags |= SHFL_CF_ACT_OPEN_IF_EXISTS;
+ } else {
+ params.create_flags |= SHFL_CF_ACT_FAIL_IF_NEW;
+ if (file->f_flags & O_TRUNC)
+ params.create_flags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
+ }
+
+ switch (file->f_flags & O_ACCMODE) {
+ case O_RDONLY:
+ params.create_flags |= SHFL_CF_ACCESS_READ;
+ break;
+
+ case O_WRONLY:
+ params.create_flags |= SHFL_CF_ACCESS_WRITE;
+ break;
+
+ case O_RDWR:
+ params.create_flags |= SHFL_CF_ACCESS_READWRITE;
+ break;
+
+ default:
+ WARN_ON(1);
+ }
+
+ if (file->f_flags & O_APPEND)
+ params.create_flags |= SHFL_CF_ACCESS_APPEND;
+
+ params.info.attr.mode = inode->i_mode;
+ rc = vboxsf_create(sf_g->root, sf_i->path, &params);
+ if (rc < 0) {
+ kfree(sf_r);
+ return vbg_status_code_to_errno(rc);
+ }
+
+ if (params.handle == SHFL_HANDLE_NIL) {
+ switch (params.result) {
+ case SHFL_PATH_NOT_FOUND:
+ case SHFL_FILE_NOT_FOUND:
+ rc_linux = -ENOENT;
+ break;
+ case SHFL_FILE_EXISTS:
+ rc_linux = -EEXIST;
+ break;
+ default:
+ break;
+ }
+ }
+
+ sf_i->force_restat = 1;
+ sf_r->handle = params.handle;
+ sf_i->file = file;
+ file->private_data = sf_r;
+ return rc_linux;
+}
+
+/**
+ * Close a regular file.
+ *
+ * @param inode the inode
+ * @param file the file
+ * @returns 0 on success, Linux error code otherwise
+ */
+static int sf_reg_release(struct inode *inode, struct file *file)
+{
+ struct sf_reg_info *sf_r;
+ struct sf_glob_info *sf_g;
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+
+ sf_g = GET_GLOB_INFO(inode->i_sb);
+ sf_r = file->private_data;
+
+ filemap_write_and_wait(inode->i_mapping);
+
+ vboxsf_close(sf_g->root, sf_r->handle);
+
+ kfree(sf_r);
+ sf_i->file = NULL;
+ sf_i->handle = SHFL_HANDLE_NIL;
+ file->private_data = NULL;
+ return 0;
+}
+
+static int sf_reg_fault(struct vm_fault *vmf)
+{
+ struct page *page;
+ char *buf;
+ loff_t off;
+ u32 nread = PAGE_SIZE;
+ int err;
+ struct vm_area_struct *vma = vmf->vma;
+ struct file *file = vma->vm_file;
+ struct inode *inode = GET_F_DENTRY(file)->d_inode;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+
+ if (vmf->pgoff > vma->vm_end)
+ return VM_FAULT_SIGBUS;
+
+ /*
+ * Don't use GFP_HIGHUSER as long as sf_reg_read_aux() calls
+ * vboxsf_read() which works on virtual addresses.
+ */
+ page = alloc_page(GFP_USER);
+ if (!page)
+ return VM_FAULT_OOM;
+
+ buf = kmap(page);
+ off = (vmf->pgoff << PAGE_SHIFT);
+ err = sf_reg_read_aux(__func__, sf_g, sf_r, buf, &nread, off);
+ if (err) {
+ kunmap(page);
+ put_page(page);
+ return VM_FAULT_SIGBUS;
+ }
+
+ if (!nread)
+ clear_user_page(page_address(page), vmf->pgoff, page);
+ else
+ memset(buf + nread, 0, PAGE_SIZE - nread);
+
+ flush_dcache_page(page);
+ kunmap(page);
+ vmf->page = page;
+ return 0;
+}
+
+static const struct vm_operations_struct sf_vma_ops = {
+ .fault = sf_reg_fault
+};
+
+static int sf_reg_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ if (vma->vm_flags & VM_SHARED)
+ return -EINVAL;
+
+ vma->vm_ops = &sf_vma_ops;
+ return 0;
+}
+
+const struct file_operations sf_reg_fops = {
+ .read = sf_reg_read,
+ .open = sf_reg_open,
+ .write = sf_reg_write,
+ .release = sf_reg_release,
+ .mmap = sf_reg_mmap,
+ .splice_read = generic_file_splice_read,
+ .read_iter = generic_file_read_iter,
+ .write_iter = generic_file_write_iter,
+ .fsync = noop_fsync,
+ .llseek = generic_file_llseek,
+};
+
+const struct inode_operations sf_reg_iops = {
+ .getattr = sf_getattr,
+ .setattr = sf_setattr
+};
+
+static int sf_readpage(struct file *file, struct page *page)
+{
+ struct inode *inode = GET_F_DENTRY(file)->d_inode;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ u32 nread = PAGE_SIZE;
+ char *buf;
+ loff_t off = ((loff_t) page->index) << PAGE_SHIFT;
+ int err;
+
+ buf = kmap(page);
+ err = sf_reg_read_aux(__func__, sf_g, sf_r, buf, &nread, off);
+ if (err) {
+ kunmap(page);
+ if (PageLocked(page))
+ unlock_page(page);
+ return err;
+ }
+ memset(&buf[nread], 0, PAGE_SIZE - nread);
+ flush_dcache_page(page);
+ kunmap(page);
+ SetPageUptodate(page);
+ unlock_page(page);
+ return 0;
+}
+
+static int sf_writepage(struct page *page, struct writeback_control *wbc)
+{
+ struct address_space *mapping = page->mapping;
+ struct inode *inode = mapping->host;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+ struct file *file = sf_i->file;
+ struct sf_reg_info *sf_r = file->private_data;
+ char *buf;
+ u32 nwritten = PAGE_SIZE;
+ int end_index = inode->i_size >> PAGE_SHIFT;
+ loff_t off = ((loff_t) page->index) << PAGE_SHIFT;
+ int err;
+
+ if (page->index >= end_index)
+ nwritten = inode->i_size & (PAGE_SIZE - 1);
+
+ buf = kmap(page);
+
+ err = sf_reg_write_aux(__func__, sf_g, sf_r, buf, &nwritten, off);
+ if (err < 0) {
+ ClearPageUptodate(page);
+ goto out;
+ }
+
+ if (off > inode->i_size)
+ inode->i_size = off;
+
+ if (PageError(page))
+ ClearPageError(page);
+ err = 0;
+
+out:
+ kunmap(page);
+
+ unlock_page(page);
+ return err;
+}
+
+int sf_write_begin(struct file *file, struct address_space *mapping, loff_t pos,
+ unsigned int len, unsigned int flags, struct page **pagep,
+ void **fsdata)
+{
+ return simple_write_begin(file, mapping, pos, len, flags, pagep,
+ fsdata);
+}
+
+int sf_write_end(struct file *file, struct address_space *mapping, loff_t pos,
+ unsigned int len, unsigned int copied, struct page *page,
+ void *fsdata)
+{
+ struct inode *inode = mapping->host;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ unsigned int from = pos & (PAGE_SIZE - 1);
+ u32 nwritten = len;
+ void *buf;
+ int err;
+
+ buf = kmap(page);
+ err =
+ sf_reg_write_aux(__func__, sf_g, sf_r, buf + from, &nwritten, pos);
+ kunmap(page);
+
+ if (!PageUptodate(page) && err == PAGE_SIZE)
+ SetPageUptodate(page);
+
+ if (err >= 0) {
+ pos += nwritten;
+ if (pos > inode->i_size)
+ inode->i_size = pos;
+ }
+
+ unlock_page(page);
+ put_page(page);
+
+ return nwritten;
+}
+
+const struct address_space_operations sf_reg_aops = {
+ .readpage = sf_readpage,
+ .writepage = sf_writepage,
+ .write_begin = sf_write_begin,
+ .write_end = sf_write_end,
+};
diff --git a/fs/vboxsf/shfl_hostintf.h b/fs/vboxsf/shfl_hostintf.h
new file mode 100644
index 000000000000..42e5509ceb1c
--- /dev/null
+++ b/fs/vboxsf/shfl_hostintf.h
@@ -0,0 +1,1283 @@
+/*
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * VirtualBox Shared Folders: host interface definition.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, in which case the provisions of the CDDL are applicable
+ * instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef SHFL_HOSTINTF_H
+#define SHFL_HOSTINTF_H
+
+#include <linux/vbox_vmmdev.h>
+
+/*
+ * We cannot use linux' compiletime_assert here because it expects to be used
+ * inside a function only. Use a typedef to a char array with a negative size.
+ */
+#define VBOXSF_ASSERT_SIZE(type, size) \
+ typedef char type ## _asrt_size[1 - 2*!!(sizeof(struct type) != (size))]
+#define VBOXSF_ASSERT_MEMBER_OFFSET(type, member, offset) \
+ typedef char type ## _ ## member ## _asrt_member_offset \
+ [1 - 2*!!(offsetof(struct type, member) != (offset))]
+
+/**
+ * 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.
+ */
+
+/**
+ * Shared Folders service functions. (guest)
+ * @{
+ */
+
+/** Query mappings changes. */
+#define SHFL_FN_QUERY_MAPPINGS (1)
+/** Query mappings changes. */
+#define SHFL_FN_QUERY_MAP_NAME (2)
+/** Open/create object. */
+#define SHFL_FN_CREATE (3)
+/** Close object handle. */
+#define SHFL_FN_CLOSE (4)
+/** Read object content. */
+#define SHFL_FN_READ (5)
+/** Write new object content. */
+#define SHFL_FN_WRITE (6)
+/** Lock/unlock a range in the object. */
+#define SHFL_FN_LOCK (7)
+/** List object content. */
+#define SHFL_FN_LIST (8)
+/** Query/set object information. */
+#define SHFL_FN_INFORMATION (9)
+/** Remove object */
+#define SHFL_FN_REMOVE (11)
+/** Map folder (legacy) */
+#define SHFL_FN_MAP_FOLDER_OLD (12)
+/** Unmap folder */
+#define SHFL_FN_UNMAP_FOLDER (13)
+/** Rename object (possibly moving it to another directory) */
+#define SHFL_FN_RENAME (14)
+/** Flush file */
+#define SHFL_FN_FLUSH (15)
+/** @todo macl, a description, please. */
+#define SHFL_FN_SET_UTF8 (16)
+#define SHFL_CPARMS_SET_UTF8 0
+/** Map folder */
+#define SHFL_FN_MAP_FOLDER (17)
+/** Read symlink destination (as of VBox 4.0) */
+#define SHFL_FN_READLINK (18)
+/** Create symlink (as of VBox 4.0) */
+#define SHFL_FN_SYMLINK (19)
+/** Ask host to show symlinks (as of VBox 4.0) */
+#define SHFL_FN_SET_SYMLINKS (20)
+#define SHFL_CPARMS_SET_SYMLINKS 0
+
+/** @} */
+
+/**
+ * Shared Folders service functions. (host)
+ * @{
+ */
+
+/** Add shared folder mapping. */
+#define SHFL_FN_ADD_MAPPING (1)
+/** Remove shared folder mapping. */
+#define SHFL_FN_REMOVE_MAPPING (2)
+/** Set the led status light address. */
+#define SHFL_FN_SET_STATUS_LED (3)
+/** Allow the guest to create symbolic links (as of VBox 4.0) */
+#define SHFL_FN_ALLOW_SYMLINKS_CREATE (4)
+/** @} */
+
+/**
+ * Root handle for a mapping. Root handles are unique.
+ * @note
+ * Function parameters structures consider
+ * the root handle as 32 bit value. If the typedef
+ * will be changed, then function parameters must be
+ * changed accordingly. All those parameters are marked
+ * with SHFLROOT in comments.
+ */
+#define SHFLROOT u32
+
+#define SHFL_ROOT_NIL ((SHFLROOT)~0)
+
+/** A shared folders handle for an opened object. */
+#define SHFLHANDLE u64
+
+#define SHFL_HANDLE_NIL ((SHFLHANDLE)~0LL)
+#define SHFL_HANDLE_ROOT ((SHFLHANDLE)0LL)
+
+/** Hardcoded maximum length (in chars) of a shared folder name. */
+#define SHFL_MAX_LEN (256)
+/** Hardcoded maximum number of shared folder mapping available to the guest. */
+#define SHFL_MAX_MAPPINGS (64)
+
+/**
+ * @name Shared Folders strings. They can be either UTF-8 or UTF-16.
+ * @{
+ */
+
+/** Shared folder string buffer structure. */
+struct shfl_string {
+ /** Allocated size of the string member in bytes. */
+ u16 size;
+
+ /** Length of string without trailing nul in bytes. */
+ u16 length;
+
+ /** UTF-8 or UTF-16 string. Nul terminated. */
+ union {
+ u8 utf8[1];
+ u16 utf16[1];
+ u16 ucs2[1]; /**< misnomer, use utf16. */
+ } string;
+};
+VBOXSF_ASSERT_SIZE(shfl_string, 6);
+VBOXSF_ASSERT_MEMBER_OFFSET(shfl_string, string, 4);
+
+/** 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 {
+ s64 cb; /**< Size of EAs. */
+} __packed;
+
+/** Shared folder filesystem object attributes. */
+struct shfl_fsobjattr {
+ /**
+ * Mode flags (st_mode). SHFL_UNIX_*, SHFL_TYPE_*, and SHFL_DOS_*.
+ * @remarks We depend on a number of SHFL_ defines to remain unchanged.
+ * Fortuntately, these are depending on windows, dos and unix
+ * standard values, so this shouldn't be much of a pain.
+ */
+ 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;
+VBOXSF_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).
+ * @remarks Here (and other places) we depend on the IPRT timespec to
+ * remain unchanged.
+ */
+ 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;
+VBOXSF_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
+};
+
+/**
+ * Open/create flags.
+ * @{
+ */
+
+/** 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'.
+ * @todo possibly not needed???
+ */
+#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)
+
+/** @} */
+
+struct shfl_createparms {
+ /* Returned handle of opened object. */
+ SHFLHANDLE 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 Folders mappings.
+ * @{
+ */
+
+/** The mapping has been added since last query. */
+#define SHFL_MS_NEW (1)
+/** The mapping has been deleted since last query. */
+#define SHFL_MS_DELETED (2)
+
+struct shfl_mapping {
+ /** Mapping status. */
+ u32 status;
+ /** Root handle. */
+ SHFLROOT root;
+};
+
+/** @} */
+
+/**
+ * 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];
+ /** @todo malc, a description, please. */
+ 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;
+
+ /** @todo more? */
+};
+VBOXSF_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;
+};
+
+/** @} */
+
+/**
+ * Function parameter structures.
+ * @{
+ */
+
+/** SHFL_FN_QUERY_MAPPINGS */
+
+/**
+ * Validation mask. Needs to be adjusted
+ * whenever a new SHFL_MF_ flag is added.
+ */
+#define SHFL_MF_MASK (0x00000011)
+/** UC2 enconded strings. */
+#define SHFL_MF_UCS2 (0x00000000)
+/** Guest uses UTF8 strings, if not set then the strings are unicode (UCS2). */
+#define SHFL_MF_UTF8 (0x00000001)
+/** Just handle the auto-mounted folders. */
+#define SHFL_MF_AUTOMOUNT (0x00000010)
+
+/** Type of guest system. For future system dependent features. */
+#define SHFL_MF_SYSTEM_MASK (0x0000ff00)
+#define SHFL_MF_SYSTEM_NONE (0x00000000)
+#define SHFL_MF_SYSTEM_WINDOWS (0x00000100)
+#define SHFL_MF_SYSTEM_LINUX (0x00000200)
+
+/** Parameters structure. */
+struct shfl_query_mappings {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * 32bit, in:
+ * Flags describing various client needs.
+ */
+ HGCMFunctionParameter flags;
+
+ /**
+ * 32bit, in/out:
+ * Number of mappings the client expects.
+ * This is the number of elements in the
+ * mappings array.
+ */
+ HGCMFunctionParameter number_of_mappings;
+
+ /**
+ * pointer, in/out:
+ * Points to array of struct shfl_mapping structures.
+ */
+ HGCMFunctionParameter mappings;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_QUERY_MAPPINGS (3)
+
+/**
+ * SHFL_FN_QUERY_MAP_NAME
+ */
+
+/** Parameters structure. */
+struct shfl_query_map_name {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * 32bit, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * pointer, in/out:
+ * Points to struct shfl_string buffer.
+ */
+ HGCMFunctionParameter name;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_QUERY_MAP_NAME (2)
+
+/**
+ * SHFL_FN_MAP_FOLDER
+ */
+
+/** Parameters structure. */
+struct shfl_map_folder {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string buffer.
+ */
+ HGCMFunctionParameter path;
+
+ /**
+ * pointer, out: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * pointer, in: UTF16
+ * Path delimiter
+ */
+ HGCMFunctionParameter delimiter;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Case senstive flag
+ */
+ HGCMFunctionParameter case_sensitive;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_MAP_FOLDER (4)
+
+/**
+ * SHFL_FN_UNMAP_FOLDER
+ */
+
+/** Parameters structure. */
+struct shfl_unmap_folder {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_UNMAP_FOLDER (1)
+
+/**
+ * SHFL_FN_CREATE
+ */
+
+/** Parameters structure. */
+struct shfl_create {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string buffer.
+ */
+ HGCMFunctionParameter path;
+
+ /**
+ * pointer, in/out:
+ * Points to SHFLCREATEPARMS buffer.
+ */
+ HGCMFunctionParameter parms;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_CREATE (3)
+
+/**
+ * SHFL_FN_CLOSE
+ */
+
+/** Parameters structure. */
+struct shfl_close {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE of object to close.
+ */
+ HGCMFunctionParameter handle;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_CLOSE (2)
+
+/**
+ * SHFL_FN_READ
+ */
+
+/** Parameters structure. */
+struct shfl_read {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE of object to read from.
+ */
+ HGCMFunctionParameter handle;
+
+ /**
+ * value64, in:
+ * Offset to read from.
+ */
+ HGCMFunctionParameter offset;
+
+ /**
+ * value64, in/out:
+ * Bytes to read/How many were read.
+ */
+ HGCMFunctionParameter cb;
+
+ /**
+ * pointer, out:
+ * Buffer to place data to.
+ */
+ HGCMFunctionParameter buffer;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_READ (5)
+
+/**
+ * SHFL_FN_WRITE
+ */
+
+/** Parameters structure. */
+struct shfl_write {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE of object to write to.
+ */
+ HGCMFunctionParameter handle;
+
+ /**
+ * value64, in:
+ * Offset to write to.
+ */
+ HGCMFunctionParameter offset;
+
+ /**
+ * value64, in/out:
+ * Bytes to write/How many were written.
+ */
+ HGCMFunctionParameter cb;
+
+ /**
+ * pointer, in:
+ * Data to write.
+ */
+ HGCMFunctionParameter buffer;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_WRITE (5)
+
+/**
+ * SHFL_FN_LOCK
+ */
+
+/** Lock owner is the HGCM client. */
+
+/** Lock mode bit mask. */
+#define SHFL_LOCK_MODE_MASK (0x3)
+/** Cancel lock on the given range. */
+#define SHFL_LOCK_CANCEL (0x0)
+/** Acquire read only lock. Prevent write to the range. */
+#define SHFL_LOCK_SHARED (0x1)
+/** Acquire write lock. Prevent both write and read to the range. */
+#define SHFL_LOCK_EXCLUSIVE (0x2)
+
+/** Do not wait for lock if it can not be acquired at the time. */
+#define SHFL_LOCK_NOWAIT (0x0)
+/** Wait and acquire lock. */
+#define SHFL_LOCK_WAIT (0x4)
+
+/** Lock the specified range. */
+#define SHFL_LOCK_PARTIAL (0x0)
+/** Lock entire object. */
+#define SHFL_LOCK_ENTIRE (0x8)
+
+/** Parameters structure. */
+struct shfl_lock {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE of object to be locked.
+ */
+ HGCMFunctionParameter handle;
+
+ /**
+ * value64, in:
+ * Starting offset of lock range.
+ */
+ HGCMFunctionParameter offset;
+
+ /**
+ * value64, in:
+ * Length of range.
+ */
+ HGCMFunctionParameter length;
+
+ /**
+ * value32, in:
+ * Lock flags SHFL_LOCK_*.
+ */
+ HGCMFunctionParameter flags;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_LOCK (5)
+
+/**
+ * SHFL_FN_FLUSH
+ */
+
+/** Parameters structure. */
+struct shfl_flush {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE of object to be locked.
+ */
+ HGCMFunctionParameter handle;
+
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_FLUSH (2)
+
+/**
+ * SHFL_FN_LIST
+ */
+
+/** Listing information includes variable length RTDIRENTRY[EX] structures. */
+
+/** @todo might be necessary for future. */
+#define SHFL_LIST_NONE 0
+#define SHFL_LIST_RETURN_ONE 1
+
+/** Parameters structure. */
+struct shfl_list {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE of object to be listed.
+ */
+ HGCMFunctionParameter handle;
+
+ /**
+ * value32, in:
+ * List flags SHFL_LIST_*.
+ */
+ HGCMFunctionParameter flags;
+
+ /**
+ * value32, in/out:
+ * Bytes to be used for listing information/How many bytes were used.
+ */
+ HGCMFunctionParameter cb;
+
+ /**
+ * pointer, in/optional
+ * Points to struct shfl_string buffer that specifies a search path.
+ */
+ HGCMFunctionParameter path;
+
+ /**
+ * pointer, out:
+ * Buffer to place listing information to. (struct shfl_dirinfo)
+ */
+ HGCMFunctionParameter 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.
+ */
+ HGCMFunctionParameter resume_point;
+
+ /**
+ * pointer, out:
+ * Number of files returned
+ */
+ HGCMFunctionParameter file_count;
+};
+
+/** Number of parameters */
+#define SHFL_CPARMS_LIST (8)
+
+/**
+ * SHFL_FN_READLINK
+ */
+
+/** Parameters structure. */
+struct shfl_readLink {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string buffer.
+ */
+ HGCMFunctionParameter path;
+
+ /**
+ * pointer, out:
+ * Buffer to place data to.
+ */
+ HGCMFunctionParameter 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)
+
+/** @todo different file info structures */
+
+/** Parameters structure. */
+struct shfl_information {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE of object to be listed.
+ */
+ HGCMFunctionParameter handle;
+
+ /**
+ * value32, in:
+ * SHFL_INFO_*
+ */
+ HGCMFunctionParameter flags;
+
+ /**
+ * value32, in/out:
+ * Bytes to be used for information/How many bytes were used.
+ */
+ HGCMFunctionParameter 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.
+ */
+ HGCMFunctionParameter 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)
+
+/** Parameters structure. */
+struct shfl_remove {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string buffer.
+ */
+ HGCMFunctionParameter path;
+
+ /**
+ * value32, in:
+ * remove flags (file/directory)
+ */
+ HGCMFunctionParameter 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)
+
+/** Parameters structure. */
+struct shfl_rename {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string src.
+ */
+ HGCMFunctionParameter src;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string dest.
+ */
+ HGCMFunctionParameter dest;
+
+ /**
+ * value32, in:
+ * rename flags (file/directory)
+ */
+ HGCMFunctionParameter flags;
+
+};
+
+#define SHFL_CPARMS_RENAME (4)
+
+/**
+ * SHFL_FN_SYMLINK
+ */
+
+/** Parameters structure. */
+struct shfl_symlink {
+ VBoxGuestHGCMCallInfo call_info;
+
+ /**
+ * pointer, in: SHFLROOT
+ * Root handle of the mapping which name is queried.
+ */
+ HGCMFunctionParameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string of path for the new symlink.
+ */
+ HGCMFunctionParameter new_path;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string of destination for symlink.
+ */
+ HGCMFunctionParameter old_path;
+
+ /**
+ * pointer, out:
+ * Information about created symlink.
+ */
+ HGCMFunctionParameter info;
+
+};
+
+#define SHFL_CPARMS_SYMLINK (4)
+
+/**
+ * SHFL_FN_ADD_MAPPING
+ * Host call, no guest structure is used.
+ */
+
+/** mapping is writable */
+#define SHFL_ADD_MAPPING_F_WRITABLE BIT(0)
+/** mapping is automounted by the guest */
+#define SHFL_ADD_MAPPING_F_AUTOMOUNT BIT(1)
+/** allow the guest to create symlinks */
+#define SHFL_ADD_MAPPING_F_CREATE_SYMLINKS BIT(2)
+/** mapping is actually missing on the host */
+#define SHFL_ADD_MAPPING_F_MISSING BIT(3)
+
+#define SHFL_CPARMS_ADD_MAPPING (3)
+
+/**
+ * SHFL_FN_REMOVE_MAPPING
+ * Host call, no guest structure is used.
+ */
+
+#define SHFL_CPARMS_REMOVE_MAPPING (1)
+
+/**
+ * SHFL_FN_SET_STATUS_LED
+ * Host call, no guest structure is used.
+ */
+
+#define SHFL_CPARMS_SET_STATUS_LED (1)
+
+/** @} */
+
+#endif
diff --git a/fs/vboxsf/utils.c b/fs/vboxsf/utils.c
new file mode 100644
index 000000000000..861afb421b5e
--- /dev/null
+++ b/fs/vboxsf/utils.c
@@ -0,0 +1,674 @@
+/*
+ * VirtualBox Guest Shared Folders support: Utility functions.
+ * Mainly conversion from/to VirtualBox/Linux data structures.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/namei.h>
+#include <linux/nfs_fs.h>
+#include <linux/nls.h>
+#include <linux/vfs.h>
+#include <linux/vbox_err.h>
+#include <linux/vbox_utils.h>
+#include "vfsmod.h"
+
+/*
+ * sf_reg_aops and sf_backing_dev_info are just quick implementations to make
+ * sendfile work. For more information have a look at
+ *
+ * http://us1.samba.org/samba/ftp/cifs-cvs/ols2006-fs-tutorial-smf.odp
+ *
+ * and the sample implementation
+ *
+ * http://pserver.samba.org/samba/ftp/cifs-cvs/samplefs.tar.gz
+ */
+
+static void sf_timespec_from_vbox(struct timespec *tv,
+ const struct shfl_timespec *ts)
+{
+ s64 nsec, t = ts->ns_relative_to_unix_epoch;
+
+ nsec = do_div(t, 1000000000);
+ tv->tv_sec = t;
+ tv->tv_nsec = nsec;
+}
+
+static void sf_timespec_to_vbox(struct shfl_timespec *ts,
+ const struct timespec *tv)
+{
+ s64 t = (s64) tv->tv_nsec + (s64) tv->tv_sec * 1000000000;
+
+ ts->ns_relative_to_unix_epoch = t;
+}
+
+/* set [inode] attributes based on [info], uid/gid based on [sf_g] */
+void sf_init_inode(struct sf_glob_info *sf_g, struct inode *inode,
+ const struct shfl_fsobjinfo *info)
+{
+ const struct shfl_fsobjattr *attr;
+ s64 allocated;
+ int mode;
+
+ attr = &info->attr;
+
+#define mode_set(r) ((attr->mode & (SHFL_UNIX_##r)) ? (S_##r) : 0)
+
+ mode = mode_set(ISUID);
+ mode |= mode_set(ISGID);
+
+ mode |= mode_set(IRUSR);
+ mode |= mode_set(IWUSR);
+ mode |= mode_set(IXUSR);
+
+ mode |= mode_set(IRGRP);
+ mode |= mode_set(IWGRP);
+ mode |= mode_set(IXGRP);
+
+ mode |= mode_set(IROTH);
+ mode |= mode_set(IWOTH);
+ mode |= mode_set(IXOTH);
+
+#undef mode_set
+
+ inode->i_mapping->a_ops = &sf_reg_aops;
+
+ if (SHFL_IS_DIRECTORY(attr->mode)) {
+ inode->i_mode = sf_g->dmode != ~0 ? (sf_g->dmode & 0777) : mode;
+ inode->i_mode &= ~sf_g->dmask;
+ inode->i_mode |= S_IFDIR;
+ inode->i_op = &sf_dir_iops;
+ inode->i_fop = &sf_dir_fops;
+ /*
+ * XXX: this probably should be set to the number of entries
+ * in the directory plus two (. ..)
+ */
+ set_nlink(inode, 1);
+ } else if (SHFL_IS_SYMLINK(attr->mode)) {
+ inode->i_mode = sf_g->fmode != ~0 ? (sf_g->fmode & 0777) : mode;
+ inode->i_mode &= ~sf_g->fmask;
+ inode->i_mode |= S_IFLNK;
+ inode->i_op = &sf_lnk_iops;
+ set_nlink(inode, 1);
+ } else {
+ inode->i_mode = sf_g->fmode != ~0 ? (sf_g->fmode & 0777) : mode;
+ inode->i_mode &= ~sf_g->fmask;
+ inode->i_mode |= S_IFREG;
+ inode->i_op = &sf_reg_iops;
+ inode->i_fop = &sf_reg_fops;
+ set_nlink(inode, 1);
+ }
+
+ inode->i_uid = make_kuid(current_user_ns(), sf_g->uid);
+ inode->i_gid = make_kgid(current_user_ns(), sf_g->gid);
+
+ inode->i_size = info->size;
+ inode->i_blkbits = 12;
+ /* i_blocks always in units of 512 bytes! */
+ allocated = info->allocated + 511;
+ do_div(allocated, 512);
+ inode->i_blocks = allocated;
+
+ sf_timespec_from_vbox(&inode->i_atime, &info->access_time);
+ sf_timespec_from_vbox(&inode->i_ctime, &info->change_time);
+ sf_timespec_from_vbox(&inode->i_mtime, &info->modification_time);
+}
+
+int sf_stat(const char *caller, struct sf_glob_info *sf_g,
+ struct shfl_string *path, struct shfl_fsobjinfo *result,
+ int ok_to_fail)
+{
+ struct shfl_createparms params = {};
+ int rc;
+
+ params.handle = SHFL_HANDLE_NIL;
+ params.create_flags = SHFL_CF_LOOKUP | SHFL_CF_ACT_FAIL_IF_NEW;
+ rc = vboxsf_create(sf_g->root, path, &params);
+ if (rc == VERR_INVALID_NAME) {
+ /* this can happen for names like 'foo*' on a Windows host */
+ return -ENOENT;
+ }
+ if (rc < 0)
+ return -EPROTO;
+
+ if (params.result != SHFL_FILE_EXISTS)
+ return -ENOENT;
+
+ *result = params.info;
+ return 0;
+}
+
+/*
+ * This is called indirectly as iop through [sf_getattr]. The job is to find
+ * out whether dentry/inode is still valid. the test is failed if [dentry]
+ * does not have an inode or [sf_stat] is unsuccessful, otherwise we return
+ * success and update inode attributes.
+ */
+int sf_inode_revalidate(struct dentry *dentry)
+{
+ int err;
+ struct sf_glob_info *sf_g;
+ struct sf_inode_info *sf_i;
+ struct shfl_fsobjinfo info;
+
+ if (!dentry || !dentry->d_inode)
+ return -EINVAL;
+
+ sf_g = GET_GLOB_INFO(dentry->d_inode->i_sb);
+ sf_i = GET_INODE_INFO(dentry->d_inode);
+
+ if (!sf_i->force_restat) {
+ if (jiffies - dentry->d_time < sf_g->ttl)
+ return 0;
+ }
+
+ err = sf_stat(__func__, sf_g, sf_i->path, &info, 1);
+ if (err)
+ return err;
+
+ dentry->d_time = jiffies;
+ sf_init_inode(sf_g, dentry->d_inode, &info);
+ return 0;
+}
+
+/*
+ * This is called during name resolution/lookup to check if the [dentry] in the
+ * cache is still valid. the job is handled by [sf_inode_revalidate].
+ */
+static int sf_dentry_revalidate(struct dentry *dentry, unsigned int flags)
+{
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ if (sf_inode_revalidate(dentry))
+ return 0;
+
+ return 1;
+}
+
+int sf_getattr(const struct path *path, struct kstat *kstat, u32 request_mask,
+ unsigned int flags)
+{
+ int err;
+ struct dentry *dentry = path->dentry;
+
+ err = sf_inode_revalidate(dentry);
+ if (err)
+ return err;
+
+ generic_fillattr(dentry->d_inode, kstat);
+ return 0;
+}
+
+int sf_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct sf_glob_info *sf_g;
+ struct sf_inode_info *sf_i;
+ struct shfl_createparms params = {};
+ struct shfl_fsobjinfo info = {};
+ uint32_t buf_len;
+ int rc, err;
+
+ sf_g = GET_GLOB_INFO(dentry->d_inode->i_sb);
+ sf_i = GET_INODE_INFO(dentry->d_inode);
+ err = 0;
+
+ 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;
+
+ rc = vboxsf_create(sf_g->root, sf_i->path, &params);
+ if (rc < 0) {
+ err = vbg_status_code_to_errno(rc);
+ goto fail2;
+ }
+ if (params.result != SHFL_FILE_EXISTS) {
+ err = -ENOENT;
+ goto fail1;
+ }
+#define mode_set(r) ((iattr->ia_mode & (S_##r)) ? SHFL_UNIX_##r : 0)
+
+ /*
+ * Setting the file size and setting the other attributes has to
+ * be handled separately.
+ */
+ if (iattr->ia_valid & (ATTR_MODE | ATTR_ATIME | ATTR_MTIME)) {
+ if (iattr->ia_valid & ATTR_MODE) {
+ info.attr.mode = mode_set(ISUID);
+ info.attr.mode |= mode_set(ISGID);
+ info.attr.mode |= mode_set(IRUSR);
+ info.attr.mode |= mode_set(IWUSR);
+ info.attr.mode |= mode_set(IXUSR);
+ info.attr.mode |= mode_set(IRGRP);
+ info.attr.mode |= mode_set(IWGRP);
+ info.attr.mode |= mode_set(IXGRP);
+ info.attr.mode |= mode_set(IROTH);
+ info.attr.mode |= mode_set(IWOTH);
+ info.attr.mode |= mode_set(IXOTH);
+
+ if (iattr->ia_mode & S_IFDIR)
+ info.attr.mode |= SHFL_TYPE_DIRECTORY;
+ else
+ info.attr.mode |= SHFL_TYPE_FILE;
+ }
+
+ if (iattr->ia_valid & ATTR_ATIME)
+ sf_timespec_to_vbox(&info.access_time,
+ &iattr->ia_atime);
+
+ if (iattr->ia_valid & ATTR_MTIME)
+ sf_timespec_to_vbox(&info.modification_time,
+ &iattr->ia_mtime);
+
+ /*
+ * Ignore ctime (inode change time) as it can't be set
+ * from userland anyway.
+ */
+
+ buf_len = sizeof(info);
+ rc = vboxsf_fsinfo(sf_g->root, params.handle,
+ SHFL_INFO_SET | SHFL_INFO_FILE, &buf_len,
+ &info);
+ if (rc < 0) {
+ err = vbg_status_code_to_errno(rc);
+ goto fail1;
+ }
+ }
+#undef mode_set
+
+ if (iattr->ia_valid & ATTR_SIZE) {
+ memset(&info, 0, sizeof(info));
+ info.size = iattr->ia_size;
+ buf_len = sizeof(info);
+ rc = vboxsf_fsinfo(sf_g->root, params.handle,
+ SHFL_INFO_SET | SHFL_INFO_SIZE, &buf_len,
+ &info);
+ if (rc < 0) {
+ err = vbg_status_code_to_errno(rc);
+ goto fail1;
+ }
+ }
+
+ vboxsf_close(sf_g->root, params.handle);
+
+ return sf_inode_revalidate(dentry);
+
+fail1:
+ vboxsf_close(sf_g->root, params.handle);
+fail2:
+ return err;
+}
+
+static int sf_make_path(const char *caller, struct sf_inode_info *sf_i,
+ const char *d_name, size_t d_len,
+ struct shfl_string **result)
+{
+ size_t path_len, shflstring_len;
+ struct shfl_string *tmp;
+ uint16_t p_len;
+ uint8_t *p_name;
+ int fRoot = 0;
+
+ p_len = sf_i->path->length;
+ p_name = sf_i->path->string.utf8;
+
+ if (p_len == 1 && *p_name == '/') {
+ path_len = d_len + 1;
+ fRoot = 1;
+ } else {
+ /* lengths of constituents plus terminating zero plus slash */
+ path_len = p_len + d_len + 2;
+ if (path_len > 0xffff)
+ return -ENAMETOOLONG;
+ }
+
+ shflstring_len = offsetof(struct shfl_string, string.utf8) + path_len;
+ tmp = kmalloc(shflstring_len, GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+
+ tmp->length = path_len - 1;
+ tmp->size = path_len;
+
+ if (fRoot)
+ memcpy(&tmp->string.utf8[0], d_name, d_len + 1);
+ else {
+ memcpy(&tmp->string.utf8[0], p_name, p_len);
+ tmp->string.utf8[p_len] = '/';
+ memcpy(&tmp->string.utf8[p_len + 1], d_name, d_len);
+ tmp->string.utf8[p_len + 1 + d_len] = '\0';
+ }
+
+ *result = tmp;
+ return 0;
+}
+
+/**
+ * [dentry] contains string encoded in coding system that corresponds
+ * to [sf_g]->nls, we must convert it to UTF8 here and pass down to
+ * [sf_make_path] which will allocate struct shfl_string and fill it in
+ */
+int sf_path_from_dentry(const char *caller, struct sf_glob_info *sf_g,
+ struct sf_inode_info *sf_i, struct dentry *dentry,
+ struct shfl_string **result)
+{
+ int err;
+ const char *d_name;
+ size_t d_len;
+ const char *name;
+ size_t len = 0;
+
+ d_name = dentry->d_name.name;
+ d_len = dentry->d_name.len;
+
+ if (sf_g->nls) {
+ size_t in_len, i, out_bound_len;
+ const char *in;
+ char *out;
+
+ in = d_name;
+ in_len = d_len;
+
+ out_bound_len = PATH_MAX;
+ out = kmalloc(out_bound_len, GFP_KERNEL);
+ name = out;
+
+ for (i = 0; i < d_len; ++i) {
+ wchar_t uni;
+ int nb;
+
+ nb = sf_g->nls->char2uni(in, in_len, &uni);
+ if (nb < 0) {
+ err = -EINVAL;
+ goto fail1;
+ }
+ in_len -= nb;
+ in += nb;
+
+ nb = utf32_to_utf8(uni, out, out_bound_len);
+ if (nb < 0) {
+ err = -EINVAL;
+ goto fail1;
+ }
+ out_bound_len -= nb;
+ out += nb;
+ len += nb;
+ }
+ if (len >= PATH_MAX - 1) {
+ err = -ENAMETOOLONG;
+ goto fail1;
+ }
+
+ *out = 0;
+ } else {
+ name = d_name;
+ len = d_len;
+ }
+
+ err = sf_make_path(caller, sf_i, name, len, result);
+ if (name != d_name)
+ kfree(name);
+
+ return err;
+
+fail1:
+ kfree(name);
+ return err;
+}
+
+int sf_nlscpy(struct sf_glob_info *sf_g,
+ char *name, size_t name_bound_len,
+ const unsigned char *utf8_name, size_t utf8_len)
+{
+ if (sf_g->nls) {
+ const char *in;
+ char *out;
+ size_t out_len;
+ size_t out_bound_len;
+ size_t in_bound_len;
+
+ in = utf8_name;
+ in_bound_len = utf8_len;
+
+ out = name;
+ out_len = 0;
+ out_bound_len = name_bound_len;
+
+ while (in_bound_len) {
+ int nb;
+ unicode_t uni;
+
+ nb = utf8_to_utf32(in, in_bound_len, &uni);
+ if (nb < 0)
+ return -EINVAL;
+
+ in += nb;
+ in_bound_len -= nb;
+
+ nb = sf_g->nls->uni2char(uni, out, out_bound_len);
+ if (nb < 0)
+ return nb;
+
+ out += nb;
+ out_bound_len -= nb;
+ out_len += nb;
+ }
+
+ *out = 0;
+ } else {
+ if (utf8_len + 1 > name_bound_len)
+ return -ENAMETOOLONG;
+
+ memcpy(name, utf8_name, utf8_len + 1);
+ }
+ return 0;
+}
+
+static struct sf_dir_buf *sf_dir_buf_alloc(void)
+{
+ struct sf_dir_buf *b;
+
+ b = kmalloc(sizeof(*b), GFP_KERNEL);
+ if (!b)
+ return NULL;
+
+ b->buf = kmalloc(DIR_BUFFER_SIZE, GFP_KERNEL);
+ if (!b->buf) {
+ kfree(b);
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&b->head);
+ b->entries = 0;
+ b->used = 0;
+ b->free = DIR_BUFFER_SIZE;
+
+ return b;
+}
+
+static void sf_dir_buf_free(struct sf_dir_buf *b)
+{
+ list_del(&b->head);
+ kfree(b->buf);
+ kfree(b);
+}
+
+/**
+ * Free the directory buffer.
+ */
+void sf_dir_info_free(struct sf_dir_info *p)
+{
+ struct list_head *list, *pos, *tmp;
+
+ list = &p->info_list;
+ list_for_each_safe(pos, tmp, list) {
+ struct sf_dir_buf *b;
+
+ b = list_entry(pos, struct sf_dir_buf, head);
+ sf_dir_buf_free(b);
+ }
+ kfree(p);
+}
+
+/**
+ * Empty (but not free) the directory buffer.
+ */
+void sf_dir_info_empty(struct sf_dir_info *p)
+{
+ struct list_head *list, *pos, *tmp;
+ struct sf_dir_buf *b;
+
+ list = &p->info_list;
+ list_for_each_safe(pos, tmp, list) {
+ b = list_entry(pos, struct sf_dir_buf, head);
+ b->entries = 0;
+ b->used = 0;
+ b->free = DIR_BUFFER_SIZE;
+ }
+}
+
+/**
+ * Create a new directory buffer descriptor.
+ */
+struct sf_dir_info *sf_dir_info_alloc(void)
+{
+ struct sf_dir_info *p;
+
+ p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return NULL;
+
+ INIT_LIST_HEAD(&p->info_list);
+ return p;
+}
+
+/** Search for an empty directory content buffer. */
+static struct sf_dir_buf *sf_get_empty_dir_buf(struct sf_dir_info *sf_d)
+{
+ struct list_head *list, *pos;
+
+ list = &sf_d->info_list;
+ list_for_each(pos, list) {
+ struct sf_dir_buf *b;
+
+ b = list_entry(pos, struct sf_dir_buf, head);
+ if (!b)
+ return NULL;
+
+ if (b->used == 0)
+ return b;
+ }
+
+ return NULL;
+}
+
+int sf_dir_read_all(struct sf_glob_info *sf_g, struct sf_inode_info *sf_i,
+ struct sf_dir_info *sf_d, SHFLHANDLE handle)
+{
+ int err;
+ struct shfl_string *mask;
+ struct sf_dir_buf *b;
+
+ err = sf_make_path(__func__, sf_i, "*", 1, &mask);
+ if (err)
+ goto fail0;
+
+ for (;;) {
+ int rc;
+ void *buf;
+ u32 entries, size;
+
+ b = sf_get_empty_dir_buf(sf_d);
+ if (!b) {
+ b = sf_dir_buf_alloc();
+ if (!b) {
+ err = -ENOMEM;
+ goto fail1;
+ }
+ list_add(&b->head, &sf_d->info_list);
+ }
+
+ buf = b->buf;
+ size = b->free;
+
+ rc = vboxsf_dirinfo(sf_g->root, handle, mask, 0, 0,
+ &size, buf, &entries);
+ switch (rc) {
+ case VINF_SUCCESS:
+ /* fallthrough */
+ case VERR_NO_MORE_FILES:
+ break;
+ case VERR_NO_TRANSLATION:
+ /* XXX */
+ break;
+ default:
+ err = vbg_status_code_to_errno(rc);
+ goto fail1;
+ }
+
+ b->entries += entries;
+ b->free -= size;
+ b->used += size;
+
+ if (rc < 0)
+ break;
+ }
+ err = 0;
+
+fail1:
+ kfree(mask);
+
+fail0:
+ return err;
+}
+
+int sf_get_volume_info(struct super_block *sb, struct kstatfs *stat)
+{
+ struct sf_glob_info *sf_g;
+ struct shfl_volinfo SHFLVolumeInfo;
+ u32 buf_len;
+ int rc;
+
+ sf_g = GET_GLOB_INFO(sb);
+ buf_len = sizeof(SHFLVolumeInfo);
+ rc = vboxsf_fsinfo(sf_g->root, 0,
+ SHFL_INFO_GET | SHFL_INFO_VOLUME, &buf_len,
+ &SHFLVolumeInfo);
+ if (rc < 0)
+ return vbg_status_code_to_errno(rc);
+
+ stat->f_type = NFS_SUPER_MAGIC; /* XXX vboxsf type? */
+ stat->f_bsize = SHFLVolumeInfo.bytes_per_allocation_unit;
+
+ do_div(SHFLVolumeInfo.total_allocation_bytes,
+ SHFLVolumeInfo.bytes_per_allocation_unit);
+ stat->f_blocks = SHFLVolumeInfo.total_allocation_bytes;
+
+ do_div(SHFLVolumeInfo.available_allocation_bytes,
+ SHFLVolumeInfo.bytes_per_allocation_unit);
+ stat->f_bfree = SHFLVolumeInfo.available_allocation_bytes;
+ stat->f_bavail = SHFLVolumeInfo.available_allocation_bytes;
+
+ stat->f_files = 1000;
+ /*
+ * Don't return 0 here since the guest may then think that it is not
+ * possible to create any more files.
+ */
+ stat->f_ffree = 1000;
+ stat->f_fsid.val[0] = 0;
+ stat->f_fsid.val[1] = 0;
+ stat->f_namelen = 255;
+ return 0;
+}
+
+const struct dentry_operations sf_dentry_ops = {
+ .d_revalidate = sf_dentry_revalidate
+};
diff --git a/fs/vboxsf/vboxsf_wrappers.c b/fs/vboxsf/vboxsf_wrappers.c
new file mode 100644
index 000000000000..64ee30894ddf
--- /dev/null
+++ b/fs/vboxsf/vboxsf_wrappers.c
@@ -0,0 +1,519 @@
+/*
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * Wrapper functions for the shfl host calls.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, in which case the provisions of the CDDL are applicable
+ * instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vbox_err.h>
+#include <linux/vbox_utils.h>
+#include "vboxsf_wrappers.h"
+
+#define VBOX_INIT_CALL(a, b) \
+do { \
+ (a)->result = VINF_SUCCESS; \
+ (a)->u32ClientID = vboxsf_client_id; \
+ (a)->u32Function = SHFL_FN_##b; \
+ (a)->cParms = SHFL_CPARMS_##b; \
+} while (0)
+
+/* globals */
+static u32 vboxsf_client_id;
+
+int vboxsf_connect(void)
+{
+ struct vbg_dev *gdev;
+ HGCMServiceLocation loc;
+ int rc;
+
+ loc.type = VMMDevHGCMLoc_LocalHost_Existing;
+ strcpy(loc.u.host.achName, "VBoxSharedFolders");
+
+ gdev = vbg_get_gdev();
+ if (IS_ERR(gdev))
+ return VERR_NOT_SUPPORTED; /* No guest-device */
+
+ rc = vbg_hgcm_connect(gdev, &loc, &vboxsf_client_id);
+ vbg_put_gdev(gdev);
+
+ return rc;
+}
+
+void vboxsf_disconnect(void)
+{
+ struct vbg_dev *gdev;
+
+ gdev = vbg_get_gdev();
+ if (IS_ERR(gdev))
+ return; /* guest-device is gone, already disconnected */
+
+ vbg_hgcm_disconnect(gdev, vboxsf_client_id);
+ vbg_put_gdev(gdev);
+}
+
+static int vboxsf_hgcm_call(void *data, u32 len)
+{
+ VBoxGuestHGCMCallInfo *info = data;
+ struct vbg_dev *gdev;
+ int rc;
+
+ gdev = vbg_get_gdev();
+ if (IS_ERR(gdev))
+ return VERR_DEV_IO_ERROR; /* guest-dev removed underneath us */
+
+ rc = vbg_hgcm_call(gdev, info, len, U32_MAX, false);
+ vbg_put_gdev(gdev);
+
+ if (rc >= 0)
+ rc = info->result;
+
+ return rc;
+}
+
+int vboxsf_query_mappings(struct shfl_mapping mappings[], u32 *mappings_len)
+{
+ int rc;
+ struct shfl_query_mappings data;
+
+ VBOX_INIT_CALL(&data.call_info, QUERY_MAPPINGS);
+
+ data.flags.type = VMMDevHGCMParmType_32bit;
+ data.flags.u.value32 = SHFL_MF_UCS2;
+
+ data.number_of_mappings.type = VMMDevHGCMParmType_32bit;
+ data.number_of_mappings.u.value32 = *mappings_len;
+
+ data.mappings.type = VMMDevHGCMParmType_LinAddr;
+ data.mappings.u.Pointer.size = sizeof(struct shfl_mapping) *
+ *mappings_len;
+ data.mappings.u.Pointer.u.linearAddr = (uintptr_t)&mappings[0];
+
+ rc = vboxsf_hgcm_call(&data, sizeof(data));
+ if (rc >= 0)
+ *mappings_len = data.number_of_mappings.u.value32;
+
+ return rc;
+}
+
+int vboxsf_query_mapname(SHFLROOT root, struct shfl_string *string, u32 size)
+{
+ struct shfl_query_map_name data;
+
+ VBOX_INIT_CALL(&data.call_info, QUERY_MAP_NAME);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.name.type = VMMDevHGCMParmType_LinAddr;
+ data.name.u.Pointer.size = size;
+ data.name.u.Pointer.u.linearAddr = (uintptr_t)string;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_map_folder(struct shfl_string *folder_name, SHFLROOT *root)
+{
+ int rc;
+ struct shfl_map_folder data;
+
+ VBOX_INIT_CALL(&data.call_info, MAP_FOLDER);
+
+ data.path.type = VMMDevHGCMParmType_LinAddr;
+ data.path.u.Pointer.size = shfl_string_buf_size(folder_name);
+ data.path.u.Pointer.u.linearAddr = (uintptr_t)folder_name;
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = 0;
+
+ data.delimiter.type = VMMDevHGCMParmType_32bit;
+ data.delimiter.u.value32 = '/';
+
+ data.case_sensitive.type = VMMDevHGCMParmType_32bit;
+ data.case_sensitive.u.value32 = 1;
+
+ rc = vboxsf_hgcm_call(&data, sizeof(data));
+ if (rc >= 0)
+ *root = data.root.u.value32;
+ else if (rc == VERR_NOT_IMPLEMENTED)
+ vbg_err("%s: Error host is too old\n", __func__);
+
+ return rc;
+}
+
+int vboxsf_unmap_folder(SHFLROOT root)
+{
+ struct shfl_unmap_folder data;
+
+ VBOX_INIT_CALL(&data.call_info, UNMAP_FOLDER);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_create(SHFLROOT root, struct shfl_string *parsed_path,
+ struct shfl_createparms *create_parms)
+{
+ /** @todo copy buffers to physical or mapped memory. */
+ struct shfl_create data;
+
+ VBOX_INIT_CALL(&data.call_info, CREATE);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.path.type = VMMDevHGCMParmType_LinAddr;
+ data.path.u.Pointer.size = shfl_string_buf_size(parsed_path);
+ data.path.u.Pointer.u.linearAddr = (uintptr_t)parsed_path;
+
+ data.parms.type = VMMDevHGCMParmType_LinAddr;
+ data.parms.u.Pointer.size = sizeof(struct shfl_createparms);
+ data.parms.u.Pointer.u.linearAddr = (uintptr_t)create_parms;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_close(SHFLROOT root, SHFLHANDLE file)
+{
+ struct shfl_close data;
+
+ VBOX_INIT_CALL(&data.call_info, CLOSE);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.handle.type = VMMDevHGCMParmType_64bit;
+ data.handle.u.value64 = file;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_remove(SHFLROOT root, struct shfl_string *parsed_path, u32 flags)
+{
+ struct shfl_remove data;
+
+ VBOX_INIT_CALL(&data.call_info, REMOVE);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.path.type = VMMDevHGCMParmType_LinAddr_In;
+ data.path.u.Pointer.size = shfl_string_buf_size(parsed_path);
+ data.path.u.Pointer.u.linearAddr = (uintptr_t)parsed_path;
+
+ data.flags.type = VMMDevHGCMParmType_32bit;
+ data.flags.u.value32 = flags;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_rename(SHFLROOT root, struct shfl_string *src_path,
+ struct shfl_string *dest_path, u32 flags)
+{
+ struct shfl_rename data;
+
+ VBOX_INIT_CALL(&data.call_info, RENAME);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.src.type = VMMDevHGCMParmType_LinAddr_In;
+ data.src.u.Pointer.size = shfl_string_buf_size(src_path);
+ data.src.u.Pointer.u.linearAddr = (uintptr_t)src_path;
+
+ data.dest.type = VMMDevHGCMParmType_LinAddr_In;
+ data.dest.u.Pointer.size = shfl_string_buf_size(dest_path);
+ data.dest.u.Pointer.u.linearAddr = (uintptr_t)dest_path;
+
+ data.flags.type = VMMDevHGCMParmType_32bit;
+ data.flags.u.value32 = flags;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_read(SHFLROOT root, SHFLHANDLE file, u64 offset,
+ u32 *buf_len, u8 *buf)
+{
+ int rc;
+ struct shfl_read data;
+
+ VBOX_INIT_CALL(&data.call_info, READ);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.handle.type = VMMDevHGCMParmType_64bit;
+ data.handle.u.value64 = file;
+ data.offset.type = VMMDevHGCMParmType_64bit;
+ data.offset.u.value64 = offset;
+ data.cb.type = VMMDevHGCMParmType_32bit;
+ data.cb.u.value32 = *buf_len;
+ data.buffer.type = VMMDevHGCMParmType_LinAddr_Out;
+ data.buffer.u.Pointer.size = *buf_len;
+ data.buffer.u.Pointer.u.linearAddr = (uintptr_t)buf;
+
+ rc = vboxsf_hgcm_call(&data, sizeof(data));
+ if (rc >= 0)
+ *buf_len = data.cb.u.value32;
+
+ return rc;
+}
+
+int vboxsf_write(SHFLROOT root, SHFLHANDLE file, u64 offset,
+ u32 *buf_len, u8 *buf)
+{
+ int rc;
+ struct shfl_write data;
+
+ VBOX_INIT_CALL(&data.call_info, WRITE);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.handle.type = VMMDevHGCMParmType_64bit;
+ data.handle.u.value64 = file;
+ data.offset.type = VMMDevHGCMParmType_64bit;
+ data.offset.u.value64 = offset;
+ data.cb.type = VMMDevHGCMParmType_32bit;
+ data.cb.u.value32 = *buf_len;
+ data.buffer.type = VMMDevHGCMParmType_LinAddr_In;
+ data.buffer.u.Pointer.size = *buf_len;
+ data.buffer.u.Pointer.u.linearAddr = (uintptr_t)buf;
+
+ rc = vboxsf_hgcm_call(&data, sizeof(data));
+ if (rc >= 0)
+ *buf_len = data.cb.u.value32;
+
+ return rc;
+}
+
+int vboxsf_write_physcont(SHFLROOT root, SHFLHANDLE file, u64 offset,
+ u32 *buf_len, u64 phys_buf)
+{
+ HGCMPageListInfo *pg_lst;
+ u32 i, pages, data_len;
+ struct shfl_write *data;
+ int rc;
+
+ pages = PAGE_ALIGN((phys_buf & ~PAGE_MASK) + *buf_len) >> PAGE_SHIFT;
+ data_len = sizeof(struct shfl_write) +
+ offsetof(HGCMPageListInfo, aPages[pages]);
+
+ data = kmalloc(data_len, GFP_KERNEL);
+ if (!data)
+ return VERR_NO_TMP_MEMORY;
+
+ VBOX_INIT_CALL(&data->call_info, WRITE);
+
+ data->root.type = VMMDevHGCMParmType_32bit;
+ data->root.u.value32 = root;
+
+ data->handle.type = VMMDevHGCMParmType_64bit;
+ data->handle.u.value64 = file;
+ data->offset.type = VMMDevHGCMParmType_64bit;
+ data->offset.u.value64 = offset;
+ data->cb.type = VMMDevHGCMParmType_32bit;
+ data->cb.u.value32 = *buf_len;
+ data->buffer.type = VMMDevHGCMParmType_PageList;
+ data->buffer.u.PageList.size = *buf_len;
+ data->buffer.u.PageList.offset = sizeof(struct shfl_write);
+
+ pg_lst = (HGCMPageListInfo *)(data + 1);
+ pg_lst->flags = VBOX_HGCM_F_PARM_DIRECTION_TO_HOST;
+ pg_lst->offFirstPage = (u16)(phys_buf & ~PAGE_MASK);
+ pg_lst->cPages = pages;
+ phys_buf = ALIGN_DOWN(phys_buf, PAGE_SIZE);
+ for (i = 0; i < pages; i++, phys_buf += PAGE_SIZE)
+ pg_lst->aPages[i] = phys_buf;
+
+ rc = vboxsf_hgcm_call(data, data_len);
+ if (rc >= 0)
+ *buf_len = data->cb.u.value32;
+
+ kfree(data);
+ return rc;
+}
+
+int vboxsf_flush(SHFLROOT root, SHFLHANDLE file)
+{
+ struct shfl_flush data;
+
+ VBOX_INIT_CALL(&data.call_info, FLUSH);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.handle.type = VMMDevHGCMParmType_64bit;
+ data.handle.u.value64 = file;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_dirinfo(SHFLROOT root, SHFLHANDLE file,
+ struct shfl_string *parsed_path, u32 flags, u32 index,
+ u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count)
+{
+ int rc;
+ struct shfl_list data;
+
+ VBOX_INIT_CALL(&data.call_info, LIST);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.handle.type = VMMDevHGCMParmType_64bit;
+ data.handle.u.value64 = file;
+ data.flags.type = VMMDevHGCMParmType_32bit;
+ data.flags.u.value32 = flags;
+ data.cb.type = VMMDevHGCMParmType_32bit;
+ data.cb.u.value32 = *buf_len;
+ data.path.type = VMMDevHGCMParmType_LinAddr_In;
+ data.path.u.Pointer.size =
+ parsed_path ? shfl_string_buf_size(parsed_path) : 0;
+ data.path.u.Pointer.u.linearAddr = (uintptr_t)parsed_path;
+
+ data.buffer.type = VMMDevHGCMParmType_LinAddr_Out;
+ data.buffer.u.Pointer.size = *buf_len;
+ data.buffer.u.Pointer.u.linearAddr = (uintptr_t)buf;
+
+ data.resume_point.type = VMMDevHGCMParmType_32bit;
+ data.resume_point.u.value32 = index;
+ data.file_count.type = VMMDevHGCMParmType_32bit;
+ data.file_count.u.value32 = 0; /* out parameters only */
+
+ rc = vboxsf_hgcm_call(&data, sizeof(data));
+
+ *buf_len = data.cb.u.value32;
+ *file_count = data.file_count.u.value32;
+
+ return rc;
+}
+
+int vboxsf_fsinfo(SHFLROOT root, SHFLHANDLE file, u32 flags,
+ u32 *buf_len, void *buf)
+{
+ int rc;
+ struct shfl_information data;
+
+ VBOX_INIT_CALL(&data.call_info, INFORMATION);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.handle.type = VMMDevHGCMParmType_64bit;
+ data.handle.u.value64 = file;
+ data.flags.type = VMMDevHGCMParmType_32bit;
+ data.flags.u.value32 = flags;
+ data.cb.type = VMMDevHGCMParmType_32bit;
+ data.cb.u.value32 = *buf_len;
+ data.info.type = VMMDevHGCMParmType_LinAddr;
+ data.info.u.Pointer.size = *buf_len;
+ data.info.u.Pointer.u.linearAddr = (uintptr_t)buf;
+
+ rc = vboxsf_hgcm_call(&data, sizeof(data));
+ if (rc >= 0)
+ *buf_len = data.cb.u.value32;
+
+ return rc;
+}
+
+int vboxsf_lock(SHFLROOT root, SHFLHANDLE file, u64 offset,
+ u64 size, u32 lock)
+{
+ struct shfl_lock data;
+
+ VBOX_INIT_CALL(&data.call_info, LOCK);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.handle.type = VMMDevHGCMParmType_64bit;
+ data.handle.u.value64 = file;
+ data.offset.type = VMMDevHGCMParmType_64bit;
+ data.offset.u.value64 = offset;
+ data.length.type = VMMDevHGCMParmType_64bit;
+ data.length.u.value64 = size;
+
+ data.flags.type = VMMDevHGCMParmType_32bit;
+ data.flags.u.value32 = lock;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_set_utf8(void)
+{
+ VBoxGuestHGCMCallInfo info;
+
+ VBOX_INIT_CALL(&info, SET_UTF8);
+
+ return vboxsf_hgcm_call(&info, sizeof(info));
+}
+
+int vboxsf_readlink(SHFLROOT root, struct shfl_string *parsed_path,
+ u32 buf_len, u8 *buf)
+{
+ struct shfl_readLink data;
+
+ VBOX_INIT_CALL(&data.call_info, READLINK);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.path.type = VMMDevHGCMParmType_LinAddr_In;
+ data.path.u.Pointer.size = shfl_string_buf_size(parsed_path);
+ data.path.u.Pointer.u.linearAddr = (uintptr_t)parsed_path;
+
+ data.buffer.type = VMMDevHGCMParmType_LinAddr_Out;
+ data.buffer.u.Pointer.size = buf_len;
+ data.buffer.u.Pointer.u.linearAddr = (uintptr_t)buf;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_symlink(SHFLROOT root, struct shfl_string *new_path,
+ struct shfl_string *old_path, struct shfl_fsobjinfo *buf)
+{
+ struct shfl_symlink data;
+
+ VBOX_INIT_CALL(&data.call_info, SYMLINK);
+
+ data.root.type = VMMDevHGCMParmType_32bit;
+ data.root.u.value32 = root;
+
+ data.new_path.type = VMMDevHGCMParmType_LinAddr_In;
+ data.new_path.u.Pointer.size = shfl_string_buf_size(new_path);
+ data.new_path.u.Pointer.u.linearAddr = (uintptr_t)new_path;
+
+ data.old_path.type = VMMDevHGCMParmType_LinAddr_In;
+ data.old_path.u.Pointer.size = shfl_string_buf_size(old_path);
+ data.old_path.u.Pointer.u.linearAddr = (uintptr_t)old_path;
+
+ data.info.type = VMMDevHGCMParmType_LinAddr_Out;
+ data.info.u.Pointer.size = sizeof(struct shfl_fsobjinfo);
+ data.info.u.Pointer.u.linearAddr = (uintptr_t)buf;
+
+ return vboxsf_hgcm_call(&data, sizeof(data));
+}
+
+int vboxsf_set_symlinks(void)
+{
+ VBoxGuestHGCMCallInfo info;
+
+ VBOX_INIT_CALL(&info, SET_SYMLINKS);
+
+ return vboxsf_hgcm_call(&info, sizeof(info));
+}
diff --git a/fs/vboxsf/vboxsf_wrappers.h b/fs/vboxsf/vboxsf_wrappers.h
new file mode 100644
index 000000000000..97e17a6997c6
--- /dev/null
+++ b/fs/vboxsf/vboxsf_wrappers.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * Protype declarations for the wrapper functions for the shfl host calls.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, in which case the provisions of the CDDL are applicable
+ * instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOXSF_WRAPPERS_H
+#define VBOXSF_WRAPPERS_H
+
+#include <linux/vboxguest.h> /* For VBoxGuestHGCMCallInfo */
+#include "shfl_hostintf.h"
+
+/**
+ * @addtogroup grp_vboxguest_lib_r0
+ *
+ * Note all these functions (all functions prefixed with vboxsf_)
+ * return a vbox status code rather then a negative errno on error.
+ * @{
+ */
+
+int vboxsf_connect(void);
+void vboxsf_disconnect(void);
+
+int vboxsf_query_mappings(struct shfl_mapping mappings[], u32 *mappings_len);
+int vboxsf_query_mapname(SHFLROOT root, struct shfl_string *string, u32 size);
+
+/**
+ * Create a new file or folder or open an existing one in a shared folder.
+ * Proxies to vbsfCreate in the host shared folder service.
+ *
+ * @returns VBox status code, but see note below
+ * @param root Root of the shared folder in which to create the file
+ * @param parsed_path The path of the file or folder relative to the shared
+ * folder
+ * @param create_parms Parameters for file/folder creation. See the
+ * structure description in shflsvc.h
+ * @retval create_parms See the structure description in shflsvc.h
+ *
+ * @note This function reports errors as follows. The return value is always
+ * VINF_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.
+ */
+int vboxsf_create(SHFLROOT root, struct shfl_string *parsed_path,
+ struct shfl_createparms *create_parms);
+
+int vboxsf_close(SHFLROOT root, SHFLHANDLE file);
+int vboxsf_remove(SHFLROOT root, struct shfl_string *parsed_path, u32 flags);
+int vboxsf_rename(SHFLROOT root, struct shfl_string *src_path,
+ struct shfl_string *dest_path, u32 flags);
+int vboxsf_flush(SHFLROOT root, SHFLHANDLE file);
+
+int vboxsf_read(SHFLROOT root, SHFLHANDLE file, u64 offset,
+ u32 *buf_len, u8 *buf);
+int vboxsf_write(SHFLROOT root, SHFLHANDLE file, u64 offset,
+ u32 *buf_len, u8 *buf);
+int vboxsf_write_physcont(SHFLROOT root, SHFLHANDLE file, u64 offset,
+ u32 *buf_len, u64 phys_buf);
+
+int vboxsf_lock(SHFLROOT root, SHFLHANDLE file, u64 offset,
+ u64 size, u32 lock);
+
+int vboxsf_dirinfo(SHFLROOT root, SHFLHANDLE file,
+ struct shfl_string *parsed_path, u32 flags, u32 index,
+ u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count);
+int vboxsf_fsinfo(SHFLROOT root, SHFLHANDLE file, u32 flags,
+ u32 *buf_len, void *buf);
+
+int vboxsf_map_folder(struct shfl_string *folder_name, SHFLROOT *root);
+int vboxsf_unmap_folder(SHFLROOT root);
+
+int vboxsf_readlink(SHFLROOT root, struct shfl_string *parsed_path,
+ u32 buf_len, u8 *buf);
+int vboxsf_symlink(SHFLROOT root, struct shfl_string *new_path,
+ struct shfl_string *old_path, struct shfl_fsobjinfo *buf);
+
+int vboxsf_set_utf8(void);
+int vboxsf_set_symlinks(void);
+
+/** @} */
+
+#endif
diff --git a/fs/vboxsf/vfsmod.c b/fs/vboxsf/vfsmod.c
new file mode 100644
index 000000000000..ee861e4c0375
--- /dev/null
+++ b/fs/vboxsf/vfsmod.c
@@ -0,0 +1,386 @@
+/*
+ * VirtualBox Guest Shared Folders support: Virtual File System.
+ *
+ * Module initialization/finalization
+ * File system registration/deregistration
+ * Superblock reading
+ * Few utility functions
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/**
+ * @note Anyone wishing to make changes here might wish to take a look at
+ * http://www.atnf.csiro.au/people/rgooch/linux/vfs.txt
+ * which seems to be the closest there is to official documentation on
+ * writing filesystem drivers for Linux.
+ */
+
+#include <linux/module.h>
+#include <linux/nls.h>
+#include <linux/vbox_utils.h>
+#include <linux/vbsfmount.h>
+#include "vfsmod.h"
+
+MODULE_DESCRIPTION("Oracle VM VirtualBox Module for Host File System Access");
+MODULE_AUTHOR("Oracle Corporation");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_FS("vboxsf");
+
+/* forward declarations */
+static struct super_operations sf_super_ops;
+
+/* allocate global info, try to map host share */
+static int sf_glob_alloc(struct vbsf_mount_info_new *info,
+ struct sf_glob_info **sf_gp)
+{
+ int err, rc;
+ size_t name_len, str_len;
+ struct sf_glob_info *sf_g;
+ struct shfl_string *str_name = NULL;
+#ifdef CONFIG_NLS_DEFAULT
+ const char *nls_name = CONFIG_NLS_DEFAULT;
+#else
+ const char *nls_name = "";
+#endif
+
+ if (info->nullchar != '\0' ||
+ info->signature[0] != VBSF_MOUNT_SIGNATURE_BYTE_0 ||
+ info->signature[1] != VBSF_MOUNT_SIGNATURE_BYTE_1 ||
+ info->signature[2] != VBSF_MOUNT_SIGNATURE_BYTE_2)
+ return -EINVAL;
+
+ sf_g = kzalloc(sizeof(*sf_g), GFP_KERNEL);
+ if (!sf_g)
+ return -ENOMEM;
+
+ info->name[sizeof(info->name) - 1] = 0;
+ info->nls_name[sizeof(info->nls_name) - 1] = 0;
+
+ name_len = strlen(info->name);
+ str_len = offsetof(struct shfl_string, string.utf8) + name_len + 1;
+
+ str_name = kmalloc(str_len, GFP_KERNEL);
+ if (!str_name) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ str_name->length = name_len;
+ str_name->size = name_len + 1;
+ memcpy(str_name->string.utf8, info->name, name_len + 1);
+
+ if (info->nls_name[0])
+ nls_name = info->nls_name;
+
+ /* Load nls if not utf8 */
+ if (nls_name[0] && strcmp(nls_name, "utf8") != 0) {
+ sf_g->nls = load_nls(info->nls_name);
+ if (!sf_g->nls) {
+ err = -EINVAL;
+ goto fail;
+ }
+ } else {
+ sf_g->nls = NULL;
+ }
+
+ rc = vboxsf_map_folder(str_name, &sf_g->root);
+ if (rc < 0) {
+ err = -EPROTO;
+ goto fail;
+ }
+
+ kfree(str_name);
+
+ sf_g->ttl = info->ttl;
+ sf_g->uid = info->uid;
+ sf_g->gid = info->gid;
+
+ if ((size_t)info->length >= sizeof(struct vbsf_mount_info_new)) {
+ /* new fields */
+ sf_g->dmode = info->dmode;
+ sf_g->fmode = info->fmode;
+ sf_g->dmask = info->dmask;
+ sf_g->fmask = info->fmask;
+ } else {
+ sf_g->dmode = ~0;
+ sf_g->fmode = ~0;
+ }
+
+ *sf_gp = sf_g;
+ return 0;
+
+fail:
+ if (sf_g->nls)
+ unload_nls(sf_g->nls);
+
+ kfree(str_name);
+ kfree(sf_g);
+
+ return err;
+}
+
+/* unmap the share and free global info [sf_g] */
+static void sf_glob_free(struct sf_glob_info *sf_g)
+{
+ vboxsf_unmap_folder(sf_g->root);
+
+ if (sf_g->nls)
+ unload_nls(sf_g->nls);
+
+ kfree(sf_g);
+}
+
+/**
+ * This is called when vfs mounts the fs and wants to read the super_block.
+ *
+ * calls [sf_glob_alloc] to map the folder and allocate global
+ * information structure.
+ *
+ * initializes [sb], initializes root inode and dentry.
+ *
+ * should respect [flags]
+ */
+static int sf_read_super(struct super_block *sb, void *data, int flags)
+{
+ int err;
+ struct dentry *droot;
+ struct inode *iroot;
+ struct sf_inode_info *sf_i;
+ struct sf_glob_info *sf_g;
+ struct shfl_fsobjinfo fsinfo;
+ struct vbsf_mount_info_new *info;
+
+ if (!data)
+ return -EINVAL;
+
+ info = data;
+
+ if (flags & MS_REMOUNT)
+ return -EINVAL;
+
+ err = sf_glob_alloc(info, &sf_g);
+ if (err)
+ goto fail0;
+
+ sf_i = kmalloc(sizeof(*sf_i), GFP_KERNEL);
+ if (!sf_i) {
+ err = -ENOMEM;
+ goto fail1;
+ }
+
+ sf_i->handle = SHFL_HANDLE_NIL;
+ sf_i->path = kmalloc(sizeof(struct shfl_string) + 1, GFP_KERNEL);
+ if (!sf_i->path) {
+ err = -ENOMEM;
+ goto fail2;
+ }
+
+ sf_i->path->length = 1;
+ sf_i->path->size = 2;
+ sf_i->path->string.utf8[0] = '/';
+ sf_i->path->string.utf8[1] = 0;
+ sf_i->force_reread = 0;
+
+ err = sf_stat(__func__, sf_g, sf_i->path, &fsinfo, 0);
+ if (err)
+ goto fail3;
+
+ sb->s_magic = 0xface;
+ sb->s_blocksize = 1024;
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_op = &sf_super_ops;
+
+ iroot = iget_locked(sb, 0);
+ if (!iroot) {
+ err = -ENOMEM; /* XXX */
+ goto fail3;
+ }
+
+ sf_init_inode(sf_g, iroot, &fsinfo);
+ SET_INODE_INFO(iroot, sf_i);
+
+ unlock_new_inode(iroot);
+
+ droot = d_make_root(iroot);
+ if (!droot) {
+ err = -ENOMEM;
+ goto fail3;
+ }
+
+ sb->s_root = droot;
+ SET_GLOB_INFO(sb, sf_g);
+ return 0;
+
+fail3:
+ kfree(sf_i->path);
+
+fail2:
+ kfree(sf_i);
+
+fail1:
+ sf_glob_free(sf_g);
+
+fail0:
+ return err;
+}
+
+/*
+ * This is called when vfs is about to destroy the [inode]. all
+ * resources associated with this [inode] must be cleared here.
+ */
+static void sf_evict_inode(struct inode *inode)
+{
+ struct sf_inode_info *sf_i;
+
+ truncate_inode_pages(&inode->i_data, 0);
+ clear_inode(inode);
+
+ sf_i = GET_INODE_INFO(inode);
+ if (!sf_i)
+ return;
+
+ kfree(sf_i->path);
+ kfree(sf_i);
+ SET_INODE_INFO(inode, NULL);
+}
+
+/*
+ * vfs is done with [sb] (umount called) call [sf_glob_free] to unmap
+ * the folder and free [sf_g]
+ */
+static void sf_put_super(struct super_block *sb)
+{
+ struct sf_glob_info *sf_g;
+
+ sf_g = GET_GLOB_INFO(sb);
+ sf_glob_free(sf_g);
+}
+
+static int sf_statfs(struct dentry *dentry, struct kstatfs *stat)
+{
+ struct super_block *sb = dentry->d_inode->i_sb;
+
+ return sf_get_volume_info(sb, stat);
+}
+
+static int sf_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ struct sf_glob_info *sf_g;
+ struct sf_inode_info *sf_i;
+ struct inode *iroot;
+ struct shfl_fsobjinfo fsinfo;
+ int err;
+
+ sf_g = GET_GLOB_INFO(sb);
+ if (data && data[0] != 0) {
+ struct vbsf_mount_info_new *info =
+ (struct vbsf_mount_info_new *)data;
+ if (info->signature[0] == VBSF_MOUNT_SIGNATURE_BYTE_0
+ && info->signature[1] == VBSF_MOUNT_SIGNATURE_BYTE_1
+ && info->signature[2] == VBSF_MOUNT_SIGNATURE_BYTE_2) {
+ sf_g->uid = info->uid;
+ sf_g->gid = info->gid;
+ sf_g->ttl = info->ttl;
+ sf_g->dmode = info->dmode;
+ sf_g->fmode = info->fmode;
+ sf_g->dmask = info->dmask;
+ sf_g->fmask = info->fmask;
+ }
+ }
+
+ iroot = ilookup(sb, 0);
+ if (!iroot)
+ return -ENOENT;
+
+ sf_i = GET_INODE_INFO(iroot);
+ err = sf_stat(__func__, sf_g, sf_i->path, &fsinfo, 0);
+ sf_init_inode(sf_g, iroot, &fsinfo);
+
+ return 0;
+}
+
+static struct super_operations sf_super_ops = {
+ .evict_inode = sf_evict_inode,
+ .put_super = sf_put_super,
+ .statfs = sf_statfs,
+ .remount_fs = sf_remount_fs
+};
+
+static struct dentry *sf_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ return mount_nodev(fs_type, flags, data, sf_read_super);
+}
+
+static struct file_system_type vboxsf_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "vboxsf",
+ .mount = sf_mount,
+ .kill_sb = kill_anon_super
+};
+
+static int follow_symlinks;
+module_param(follow_symlinks, int, 0444);
+MODULE_PARM_DESC(follow_symlinks,
+ "Let host resolve symlinks rather than showing them");
+
+/* Module initialization/finalization handlers */
+static int __init init(void)
+{
+ int rc, err;
+
+ if (sizeof(struct vbsf_mount_info_new) > PAGE_SIZE) {
+ vbg_err("vboxsf: Mount information structure is too large %zd; Must be less than or equal to %ld\n",
+ sizeof(struct vbsf_mount_info_new), PAGE_SIZE);
+ return -EINVAL;
+ }
+
+ err = register_filesystem(&vboxsf_fs_type);
+ if (err)
+ return err;
+
+ rc = vboxsf_connect();
+ if (rc < 0) {
+ vbg_err("vboxsf_Connect failed, rc=%d\n", rc);
+ err = -EPROTO;
+ goto fail1;
+ }
+
+ rc = vboxsf_set_utf8();
+ if (rc < 0) {
+ vbg_err("vboxsf_setutf8 failed, rc=%d\n", rc);
+ err = -EPROTO;
+ goto fail2;
+ }
+
+ if (!follow_symlinks) {
+ rc = vboxsf_set_symlinks();
+ if (rc < 0) {
+ vbg_warn("vboxsf: Host unable to show symlinks, rc=%d\n",
+ rc);
+ }
+ }
+
+ return 0;
+
+fail2:
+ vboxsf_disconnect();
+
+fail1:
+ unregister_filesystem(&vboxsf_fs_type);
+ return err;
+}
+
+static void __exit fini(void)
+{
+ vboxsf_disconnect();
+ unregister_filesystem(&vboxsf_fs_type);
+}
+
+module_init(init);
+module_exit(fini);
diff --git a/fs/vboxsf/vfsmod.h b/fs/vboxsf/vfsmod.h
new file mode 100644
index 000000000000..93e8791eea9a
--- /dev/null
+++ b/fs/vboxsf/vfsmod.h
@@ -0,0 +1,113 @@
+/*
+ * VirtualBox Guest Shared Folders support: module header.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef VFSMOD_H
+#define VFSMOD_H
+
+#include <linux/backing-dev.h>
+#include <linux/version.h>
+#include "vboxsf_wrappers.h"
+
+#define DIR_BUFFER_SIZE SZ_16K
+
+/* per-shared folder information */
+struct sf_glob_info {
+ SHFLROOT root;
+ struct nls_table *nls;
+ int ttl;
+ int uid;
+ int gid;
+ int dmode;
+ int fmode;
+ int dmask;
+ int fmask;
+};
+
+/* per-inode information */
+struct sf_inode_info {
+ /* which file */
+ struct shfl_string *path;
+ /* some information was changed, update data on next revalidate */
+ int force_restat;
+ /*
+ * directory content changed, update the whole directory on next
+ * sf_getdent
+ */
+ int force_reread;
+ /* file structure, only valid between open() and release() */
+ struct file *file;
+ /*
+ * handle valid if a file was created with sf_create_aux until it
+ * will be opened with sf_reg_open()
+ */
+ SHFLHANDLE handle;
+};
+
+struct sf_dir_info {
+ struct list_head info_list;
+};
+
+struct sf_dir_buf {
+ size_t entries;
+ size_t free;
+ size_t used;
+ void *buf;
+ struct list_head head;
+};
+
+struct sf_reg_info {
+ SHFLHANDLE handle;
+};
+
+/* globals */
+extern const struct inode_operations sf_dir_iops;
+extern const struct inode_operations sf_lnk_iops;
+extern const struct inode_operations sf_reg_iops;
+extern const struct file_operations sf_dir_fops;
+extern const struct file_operations sf_reg_fops;
+extern const struct dentry_operations sf_dentry_ops;
+extern const struct address_space_operations sf_reg_aops;
+
+void sf_init_inode(struct sf_glob_info *sf_g, struct inode *inode,
+ const struct shfl_fsobjinfo *info);
+int sf_stat(const char *caller, struct sf_glob_info *sf_g,
+ struct shfl_string *path, struct shfl_fsobjinfo *result,
+ int ok_to_fail);
+int sf_inode_revalidate(struct dentry *dentry);
+int sf_getattr(const struct path *path, struct kstat *kstat,
+ u32 request_mask, unsigned int query_flags);
+int sf_setattr(struct dentry *dentry, struct iattr *iattr);
+int sf_path_from_dentry(const char *caller, struct sf_glob_info *sf_g,
+ struct sf_inode_info *sf_i,
+ struct dentry *dentry, struct shfl_string **result);
+int sf_nlscpy(struct sf_glob_info *sf_g, char *name,
+ size_t name_bound_len, const unsigned char *utf8_name,
+ size_t utf8_len);
+void sf_dir_info_free(struct sf_dir_info *p);
+void sf_dir_info_empty(struct sf_dir_info *p);
+struct sf_dir_info *sf_dir_info_alloc(void);
+int sf_dir_read_all(struct sf_glob_info *sf_g,
+ struct sf_inode_info *sf_i, struct sf_dir_info *sf_d,
+ SHFLHANDLE handle);
+int sf_get_volume_info(struct super_block *sb, struct kstatfs *stat);
+
+/*
+ * Following casts are here to prevent assignment of void * to
+ * pointers of arbitrary type.
+ */
+#define GET_GLOB_INFO(sb) ((struct sf_glob_info *)(sb)->s_fs_info)
+#define SET_GLOB_INFO(sb, sf_g) ((sb)->s_fs_info = (sf_g))
+
+#define GET_INODE_INFO(i) ((struct sf_inode_info *)(i)->i_private)
+#define SET_INODE_INFO(i, sf_i) ((i)->i_private = (sf_i))
+
+#define GET_F_DENTRY(f) (f->f_path.dentry)
+
+#endif
diff --git a/include/uapi/linux/vbsfmount.h b/include/uapi/linux/vbsfmount.h
new file mode 100644
index 000000000000..21aa546a2a64
--- /dev/null
+++ b/include/uapi/linux/vbsfmount.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2006-2016 Oracle Corporation
+ *
+ * VirtualBox Guest Shared Folders: mount(2) parameter structure.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef VBFS_MOUNT_H
+#define VBFS_MOUNT_H
+
+/* Linux constraints the size of data mount argument to PAGE_SIZE - 1. */
+#define MAX_HOST_NAME 256
+#define MAX_NLS_NAME 32
+
+#define VBSF_MOUNT_SIGNATURE_BYTE_0 ('\377')
+#define VBSF_MOUNT_SIGNATURE_BYTE_1 ('\376')
+#define VBSF_MOUNT_SIGNATURE_BYTE_2 ('\375')
+
+struct vbsf_mount_info_new {
+ /*
+ * The old version of the mount_info struct started with a
+ * char name[MAX_HOST_NAME] field, where name cannot be '\0'.
+ * So the new version of the mount_info struct starts with a
+ * nullchar field which is always 0 so that we can detect and
+ * reject the old structure being passed.
+ */
+ char nullchar;
+ char signature[3]; /* signature */
+ int length; /* length of the whole structure */
+ char name[MAX_HOST_NAME]; /* share name */
+ char nls_name[MAX_NLS_NAME]; /* name of an I/O charset */
+ int uid; /* user ID for all entries, default 0=root */
+ int gid; /* group ID for all entries, default 0=root */
+ int ttl; /* time to live */
+ int dmode; /* mode for directories if != 0xffffffff */
+ int fmode; /* mode for regular files if != 0xffffffff */
+ int dmask; /* umask applied to directories */
+ int fmask; /* umask applied to regular files */
+};
+
+struct vbsf_mount_opts {
+ int uid;
+ int gid;
+ int ttl;
+ int dmode;
+ int fmode;
+ int dmask;
+ int fmask;
+ int ronly;
+ int sloppy;
+ int noexec;
+ int nodev;
+ int nosuid;
+ int remount;
+ char nls_name[MAX_NLS_NAME];
+ char *convertcp;
+};
+
+#endif /* vbsfmount.h */
--
2.13.4

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