[PATCH v5] fs: Add VirtualBox guest shared folder (vboxsf) support

From: Hans de Goede
Date: Tue Feb 06 2018 - 03:49:49 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>
---
Changes in v5:
-Honor CONFIG_NLS_DEFAULT (reported-by michael.thayer@xxxxxxxxxx)

Changes in v4:
-Drop "name=..." mount option, instead use the dev_name argument to the
mount syscall, to keep compatibility with existing fstab entries
-Fix "nls=%" match_table_t entry to "nls=%s"

Changes in v3:
-Use text only mount options, instead of a custom data struct
-Stop caching full path in inode data, if parents gets renamed it will change
-Fixed negative dentries handling
-Dropped the force_reread flag for dirs, not sure what it was actually for
but it is no good, doing a re-read on unlink of a file will lead to
another file being skipped if the caller has already iterated over the
entry for the unlinked file.
-Use file_inode(), file_dentry() and d_inode() helpers
-Prefix any non object-private symbols with vboxsf_ so as to not pollute
the global namespace when builtin
-Add MAINTAINERS entry
-Misc. cleanups

Changes in v2:
-Removed various unused wrapper functions
-Don't use i_private, instead defined alloc_inode and destroy_inode
methods and use container_of.
-Drop obsolete comment referencing people to
http://www.atnf.csiro.au/people/rgooch/linux/vfs.txt
-move the single symlink op of from lnkops.c to file.c
-Use SPDX license headers
-Replace SHFLROOT / SHFLHANDLE defines with normal types
-Removed unnecessary S_ISREG checks
-Got rid of bounce_buffer in regops, instead add a "user" flag to
vboxsf_read / vboxsf_write, re-using the existing __user address support
in the vboxguest module
-Make vboxsf_wrappers return regular linux errno values
-Use i_size_write to update size on writing
-Convert doxygen style comments to kerneldoc style comments
---
MAINTAINERS | 6 +
fs/Kconfig | 1 +
fs/Makefile | 1 +
fs/vboxsf/Kconfig | 10 +
fs/vboxsf/Makefile | 3 +
fs/vboxsf/dir.c | 575 +++++++++++++++++++++++++++
fs/vboxsf/file.c | 414 ++++++++++++++++++++
fs/vboxsf/shfl_hostintf.h | 919 ++++++++++++++++++++++++++++++++++++++++++++
fs/vboxsf/super.c | 433 +++++++++++++++++++++
fs/vboxsf/utils.c | 536 ++++++++++++++++++++++++++
fs/vboxsf/vboxsf_wrappers.c | 370 ++++++++++++++++++
fs/vboxsf/vfsmod.h | 133 +++++++
12 files changed, 3401 insertions(+)
create mode 100644 fs/vboxsf/Kconfig
create mode 100644 fs/vboxsf/Makefile
create mode 100644 fs/vboxsf/dir.c
create mode 100644 fs/vboxsf/file.c
create mode 100644 fs/vboxsf/shfl_hostintf.h
create mode 100644 fs/vboxsf/super.c
create mode 100644 fs/vboxsf/utils.c
create mode 100644 fs/vboxsf/vboxsf_wrappers.c
create mode 100644 fs/vboxsf/vfsmod.h

diff --git a/MAINTAINERS b/MAINTAINERS
index f247a069983c..f24b6bf8c361 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14570,6 +14570,12 @@ F: include/linux/vbox_utils.h
F: include/uapi/linux/vbox*.h
F: drivers/virt/vboxguest/

+VIRTUAL BOX SHARED FOLDER VFS DRIVER:
+M: Hans de Goede <hdegoede@xxxxxxxxxx>
+L: linux-fsdevel@xxxxxxxxxxxxxxx
+S: Maintained
+F: fs/vboxsf/*
+
VIRTUAL SERIO DEVICE DRIVER
M: Stephen Chandler Paul <thatslyude@xxxxxxxxx>
S: Maintained
diff --git a/fs/Kconfig b/fs/Kconfig
index 7aee6d699fd6..7f80ad1cf591 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -248,6 +248,7 @@ source "fs/pstore/Kconfig"
source "fs/sysv/Kconfig"
source "fs/ufs/Kconfig"
source "fs/exofs/Kconfig"
+source "fs/vboxsf/Kconfig"

endif # MISC_FILESYSTEMS

diff --git a/fs/Makefile b/fs/Makefile
index ef772f1eaff8..3057830f112a 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -129,3 +129,4 @@ obj-y += exofs/ # Multiple modules
obj-$(CONFIG_CEPH_FS) += ceph/
obj-$(CONFIG_PSTORE) += pstore/
obj-$(CONFIG_EFIVAR_FS) += efivarfs/
+obj-$(CONFIG_VBOXSF_FS) += vboxsf/
diff --git a/fs/vboxsf/Kconfig b/fs/vboxsf/Kconfig
new file mode 100644
index 000000000000..b034698121ea
--- /dev/null
+++ b/fs/vboxsf/Kconfig
@@ -0,0 +1,10 @@
+config VBOXSF_FS
+ tristate "VirtualBox guest shared folder (vboxsf) support"
+ depends on VBOXGUEST
+ select NLS
+ help
+ VirtualBox hosts can share folders with guests, this driver
+ implements the Linux-guest side of this allowing folders exported
+ by the host to be mounted under Linux.
+
+ If you want to use shared folders in VirtualBox guests, answer Y or M.
diff --git a/fs/vboxsf/Makefile b/fs/vboxsf/Makefile
new file mode 100644
index 000000000000..fcbd488f9eec
--- /dev/null
+++ b/fs/vboxsf/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_VBOXSF_FS) += vboxsf.o
+
+vboxsf-objs := dir.o file.o utils.o vboxsf_wrappers.o super.o
diff --git a/fs/vboxsf/dir.c b/fs/vboxsf/dir.c
new file mode 100644
index 000000000000..390d6fc5bef0
--- /dev/null
+++ b/fs/vboxsf/dir.c
@@ -0,0 +1,575 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VirtualBox Guest Shared Folders support: Directory inode and file operations
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/namei.h>
+#include <linux/vbox_utils.h>
+#include "vfsmod.h"
+
+/**
+ * Open a directory. Read the complete content into a buffer.
+ * Return: 0 or negative errno value.
+ * @inode inode
+ * @file file
+ */
+static int sf_dir_open(struct inode *inode, struct file *file)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct shfl_createparms params = {};
+ struct sf_dir_info *sf_d;
+ int err;
+
+ sf_d = vboxsf_dir_info_alloc();
+ if (!sf_d)
+ return -ENOMEM;
+
+ params.handle = SHFL_HANDLE_NIL;
+ params.create_flags = 0
+ | SHFL_CF_DIRECTORY
+ | SHFL_CF_ACT_OPEN_IF_EXISTS
+ | SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
+
+ err = vboxsf_create_at_dentry(file_dentry(file), &params);
+ if (err == 0) {
+ if (params.result == SHFL_FILE_EXISTS) {
+ err = vboxsf_dir_read_all(sf_g, sf_d, params.handle);
+ if (!err)
+ file->private_data = sf_d;
+ } else
+ err = -ENOENT;
+
+ vboxsf_close(sf_g->root, params.handle);
+ }
+
+ if (err)
+ vboxsf_dir_info_free(sf_d);
+
+ return err;
+}
+
+/**
+ * This is called when reference count of [file] goes to zero. Notify
+ * the host that it can free whatever is associated with this directory
+ * and deallocate our own internal buffers
+ * Return: 0 or negative errno value.
+ * @inode inode
+ * @file file
+ */
+static int sf_dir_release(struct inode *inode, struct file *file)
+{
+ if (file->private_data)
+ vboxsf_dir_info_free(file->private_data);
+
+ return 0;
+}
+
+/**
+ * Translate RTFMODE into DT_xxx (in conjunction to rtDirType())
+ * Return: d_type
+ * @mode file mode
+ */
+static int sf_get_d_type(u32 mode)
+{
+ int d_type;
+
+ switch (mode & SHFL_TYPE_MASK) {
+ case SHFL_TYPE_FIFO:
+ d_type = DT_FIFO;
+ break;
+ case SHFL_TYPE_DEV_CHAR:
+ d_type = DT_CHR;
+ break;
+ case SHFL_TYPE_DIRECTORY:
+ d_type = DT_DIR;
+ break;
+ case SHFL_TYPE_DEV_BLOCK:
+ d_type = DT_BLK;
+ break;
+ case SHFL_TYPE_FILE:
+ d_type = DT_REG;
+ break;
+ case SHFL_TYPE_SYMLINK:
+ d_type = DT_LNK;
+ break;
+ case SHFL_TYPE_SOCKET:
+ d_type = DT_SOCK;
+ break;
+ case SHFL_TYPE_WHITEOUT:
+ d_type = DT_WHT;
+ break;
+ default:
+ d_type = DT_UNKNOWN;
+ break;
+ }
+ return d_type;
+}
+
+/**
+ * Extract element ([dir]->f_pos) from the directory [dir] into [d_name].
+ * Return: 0 or negative errno value.
+ * @dir Directory to get element at f_pos from
+ * @d_name Buffer in which to return element name
+ * @d_type Buffer in which to return element file-type
+ */
+static int sf_getdent(struct file *dir, char d_name[NAME_MAX], int *d_type)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(file_inode(dir)->i_sb);
+ struct sf_dir_info *sf_d = dir->private_data;
+ struct list_head *pos;
+ loff_t cur = 0;
+
+ list_for_each(pos, &sf_d->info_list) {
+ struct shfl_dirinfo *info;
+ struct sf_dir_buf *b;
+ 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 vboxsf_nlscpy(sf_g, d_name, NAME_MAX,
+ info->name.string.utf8, info->name.length);
+ }
+
+ return 1;
+}
+
+/**
+ * This is called when vfs wants to populate internal buffers with
+ * directory [dir]s contents. [opaque] is an argument to the
+ * [filldir]. [filldir] magically modifies it's argument - [opaque]
+ * and takes following additional arguments (which i in turn get from
+ * the host via sf_getdent):
+ *
+ * name : name of the entry (i must also supply it's length huh?)
+ * type : type of the entry (FILE | DIR | etc) (i ellect to use DT_UNKNOWN)
+ * pos : position/index of the entry
+ * ino : inode number of the entry (i fake those)
+ *
+ * [dir] contains:
+ * f_pos : cursor into the directory listing
+ * private_data : mean of communication with the host side
+ *
+ * Extract elements from the directory listing (incrementing f_pos
+ * along the way) and feed them to [filldir] until:
+ *
+ * a. there are no more entries (i.e. sf_getdent set done to 1)
+ * b. failure to compute fake inode number
+ * c. filldir returns an error (see comment on that)
+ * Return: 0 or negative errno value.
+ * @dir Directory to read
+ * @ctx Directory context in which to store read elements
+ */
+static int sf_dir_iterate(struct file *dir, struct dir_context *ctx)
+{
+ for (;;) {
+ int err;
+ ino_t fake_ino;
+ loff_t sanity;
+ char d_name[NAME_MAX];
+ int d_type = DT_UNKNOWN;
+
+ err = sf_getdent(dir, d_name, &d_type);
+ switch (err) {
+ case 1:
+ return 0;
+
+ case 0:
+ break;
+
+ case -1:
+ default:
+ /* skip erroneous entry and proceed */
+ dir->f_pos += 1;
+ ctx->pos += 1;
+ continue;
+ }
+
+ /* d_name now contains a valid entry name */
+ sanity = ctx->pos + 0xbeef;
+ fake_ino = sanity;
+ /*
+ * On 32 bit systems pos is 64 signed, while ino is 32 bit
+ * unsigned so fake_ino may overflow, check for this.
+ */
+ if (sanity - fake_ino) {
+ vbg_err("vboxsf: can not compute ino\n");
+ return -EINVAL;
+ }
+ if (!dir_emit(ctx, d_name, strlen(d_name), fake_ino, d_type))
+ return 0;
+
+ dir->f_pos += 1;
+ ctx->pos += 1;
+ }
+}
+
+const struct file_operations vboxsf_dir_fops = {
+ .open = sf_dir_open,
+ .iterate = sf_dir_iterate,
+ .release = sf_dir_release,
+ .read = generic_read_dir,
+ .llseek = generic_file_llseek,
+};
+
+/*
+ * This is called during name resolution/lookup to check if the [dentry] in
+ * the cache is still valid. the job is handled by [sf_inode_revalidate].
+ */
+static int sf_dentry_revalidate(struct dentry *dentry, unsigned int flags)
+{
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ if (d_really_is_positive(dentry))
+ return vboxsf_inode_revalidate(dentry) == 0;
+ else
+ return vboxsf_stat_dentry(dentry, NULL) == -ENOENT;
+}
+
+static const struct dentry_operations sf_dentry_ops = {
+ .d_revalidate = sf_dentry_revalidate
+};
+
+/* iops */
+
+/**
+ * This is called when vfs failed to locate dentry in the cache. The
+ * job of this function is to allocate inode and link it to dentry.
+ * [dentry] contains the name to be looked in the [parent] directory.
+ * Failure to locate the name is not a "hard" error, in this case NULL
+ * inode is added to [dentry] and vfs should proceed trying to create
+ * the entry via other means. NULL(or "positive" pointer) ought to be
+ * returned in case of success and "negative" pointer on error
+ * Return: NULL on success, ERR_PTR on failure.
+ * @parent inode of the dentry parent-directory
+ * @dentry dentry to populate
+ * @flags flags
+ */
+static struct dentry *sf_lookup(struct inode *parent, struct dentry *dentry,
+ unsigned int flags)
+{
+ struct shfl_fsobjinfo fsinfo;
+ struct sf_inode_info *sf_i;
+ struct sf_glob_info *sf_g;
+ struct inode *inode;
+ ino_t ino;
+ int err;
+
+ sf_g = GET_GLOB_INFO(parent->i_sb);
+ sf_i = GET_INODE_INFO(parent);
+
+ err = vboxsf_stat_dentry(dentry, &fsinfo);
+ if (err) {
+ if (err != -ENOENT)
+ return ERR_PTR(err);
+ /*
+ * -ENOENT: add NULL inode to dentry so it later can
+ * be created via call to create/mkdir/open
+ */
+ inode = NULL;
+ } else {
+ ino = iunique(parent->i_sb, 1);
+ inode = iget_locked(parent->i_sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ vboxsf_init_inode(sf_g, inode, &fsinfo);
+ unlock_new_inode(inode);
+ }
+
+ dentry->d_time = jiffies;
+ d_set_d_op(dentry, &sf_dentry_ops);
+ d_add(dentry, inode);
+ return NULL;
+}
+
+/**
+ * This should allocate memory for sf_inode_info, compute a unique inode
+ * number, get an inode from vfs, initialize inode info, instantiate
+ * dentry.
+ * Return: 0 or negative errno value.
+ * @parent inode entry of the directory
+ * @dentry directory cache entry
+ * @info file information
+ * @handle handle
+ */
+static int sf_instantiate(struct inode *parent, struct dentry *dentry,
+ struct shfl_fsobjinfo *info, u64 handle)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+ struct sf_inode_info *sf_i;
+ struct inode *inode;
+ ino_t ino;
+
+ ino = iunique(parent->i_sb, 1);
+ inode = iget_locked(parent->i_sb, ino);
+ if (!inode) {
+ if (handle != SHFL_HANDLE_NIL)
+ vboxsf_close(sf_g->root, handle);
+ return -ENOMEM;
+ }
+
+ sf_i = GET_INODE_INFO(inode);
+ /* the host may have given us different attr then requested */
+ sf_i->force_restat = 1;
+ sf_i->handle = handle;
+ vboxsf_init_inode(sf_g, inode, info);
+
+ d_instantiate(dentry, inode);
+ unlock_new_inode(inode);
+
+ return 0;
+}
+
+/**
+ * Create a new regular file / directory.
+ * Return: 0 or negative errno value.
+ * @parent inode of the directory
+ * @dentry directory cache entry
+ * @mode file mode
+ * @is_dir true if directory, false otherwise
+ */
+static int sf_create_aux(struct inode *parent, struct dentry *dentry,
+ umode_t mode, int is_dir)
+{
+ struct sf_inode_info *sf_parent_i = GET_INODE_INFO(parent);
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+ struct shfl_createparms params = {};
+ int err;
+
+ params.handle = SHFL_HANDLE_NIL;
+ params.create_flags = 0
+ | SHFL_CF_ACT_CREATE_IF_NEW
+ | SHFL_CF_ACT_FAIL_IF_EXISTS
+ | SHFL_CF_ACCESS_READWRITE | (is_dir ? SHFL_CF_DIRECTORY : 0);
+ params.info.attr.mode = 0
+ | (is_dir ? SHFL_TYPE_DIRECTORY : SHFL_TYPE_FILE)
+ | (mode & 0777);
+ params.info.attr.additional = SHFLFSOBJATTRADD_NOTHING;
+
+ err = vboxsf_create_at_dentry(dentry, &params);
+ if (err)
+ return err;
+
+ if (params.result != SHFL_FILE_CREATED)
+ return -EPERM;
+
+ if (is_dir) {
+ vboxsf_close(sf_g->root, params.handle);
+ params.handle = SHFL_HANDLE_NIL;
+ }
+
+ err = sf_instantiate(parent, dentry, &params.info, params.handle);
+ if (err)
+ return err;
+
+ /* parent directory access/change time changed */
+ sf_parent_i->force_restat = 1;
+
+ /*
+ * We leave the handle open. We assume that the same file is opened
+ * with sf_reg_open() and later closed with sf_reg_close().
+ */
+ return 0;
+}
+
+/**
+ * Create a new regular file.
+ * Return: 0 or negative errno value.
+ * @parent inode of the directory
+ * @dentry directory cache entry
+ * @mode file mode
+ * @excl Possible O_EXCL...
+ */
+static int sf_create(struct inode *parent, struct dentry *dentry, umode_t mode,
+ bool excl)
+{
+ return sf_create_aux(parent, dentry, mode, 0);
+}
+
+/**
+ * Create a new directory.
+ * Return: 0 or negative errno value.
+ * @parent inode of the directory
+ * @dentry directory cache entry
+ * @mode file mode
+ */
+static int sf_mkdir(struct inode *parent, struct dentry *dentry, umode_t mode)
+{
+ return sf_create_aux(parent, dentry, mode, 1);
+}
+
+/**
+ * Remove a regular file / directory.
+ * Return: 0 or negative errno value.
+ * @parent inode of the directory
+ * @dentry directory cache entry
+ * @is_dir true if directory, false otherwise
+ */
+static int sf_unlink_aux(struct inode *parent, struct dentry *dentry,
+ int is_dir)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+ struct sf_inode_info *sf_parent_i = GET_INODE_INFO(parent);
+ struct inode *inode = d_inode(dentry);
+ struct shfl_string *path;
+ uint32_t flags;
+ int err;
+
+ flags = is_dir ? SHFL_REMOVE_DIR : SHFL_REMOVE_FILE;
+ if (inode && (inode->i_mode & S_IFLNK) == S_IFLNK)
+ flags |= SHFL_REMOVE_SYMLINK;
+
+ path = vboxsf_path_from_dentry(sf_g, dentry);
+ if (IS_ERR(path))
+ return PTR_ERR(path);
+
+ err = vboxsf_remove(sf_g->root, path, flags);
+ __putname(path);
+ if (err)
+ return err;
+
+ /* parent directory access/change time changed */
+ sf_parent_i->force_restat = 1;
+
+ return 0;
+}
+
+/**
+ * Remove a regular file.
+ * Return: 0 or negative errno value.
+ * @parent inode of the directory
+ * @dentry directory cache entry
+ */
+static int sf_unlink(struct inode *parent, struct dentry *dentry)
+{
+ return sf_unlink_aux(parent, dentry, 0);
+}
+
+/**
+ * Remove a directory.
+ * Return: 0 or negative errno value.
+ * @parent inode of the directory
+ * @dentry directory cache entry
+ */
+static int sf_rmdir(struct inode *parent, struct dentry *dentry)
+{
+ return sf_unlink_aux(parent, dentry, 1);
+}
+
+/**
+ * Rename a regular file / directory.
+ * Return: 0 or negative errno value.
+ * @old_parent inode of the old parent directory
+ * @old_dentry old directory cache entry
+ * @new_parent inode of the new parent directory
+ * @new_dentry new directory cache entry
+ * @flags flags
+ */
+static int sf_rename(struct inode *old_parent, struct dentry *old_dentry,
+ struct inode *new_parent, struct dentry *new_dentry,
+ unsigned int flags)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(old_parent->i_sb);
+ struct sf_inode_info *sf_old_parent_i = GET_INODE_INFO(old_parent);
+ struct sf_inode_info *sf_new_parent_i = GET_INODE_INFO(new_parent);
+ u32 shfl_flags = SHFL_RENAME_FILE | SHFL_RENAME_REPLACE_IF_EXISTS;
+ struct shfl_string *old_path, *new_path;
+ int err;
+
+ if (flags)
+ return -EINVAL;
+
+ if (sf_g != GET_GLOB_INFO(new_parent->i_sb))
+ return -EINVAL;
+
+ old_path = vboxsf_path_from_dentry(sf_g, old_dentry);
+ if (IS_ERR(old_path))
+ return PTR_ERR(old_path);
+
+ new_path = vboxsf_path_from_dentry(sf_g, new_dentry);
+ if (IS_ERR(new_path)) {
+ __putname(old_path);
+ return PTR_ERR(new_path);
+ }
+
+ if (d_inode(old_dentry)->i_mode & S_IFDIR)
+ shfl_flags = 0;
+
+ err = vboxsf_rename(sf_g->root, old_path, new_path, shfl_flags);
+ if (err == 0) {
+ /* parent directories access/change time changed */
+ sf_new_parent_i->force_restat = 1;
+ sf_old_parent_i->force_restat = 1;
+ }
+
+ __putname(new_path);
+ __putname(old_path);
+ return err;
+}
+
+static int sf_symlink(struct inode *parent, struct dentry *dentry,
+ const char *symname)
+{
+ struct sf_inode_info *sf_parent_i = GET_INODE_INFO(parent);
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
+ int symname_size = strlen(symname) + 1;
+ struct shfl_string *path, *ssymname;
+ struct shfl_fsobjinfo info;
+ int err;
+
+ path = vboxsf_path_from_dentry(sf_g, dentry);
+ if (IS_ERR(path))
+ return PTR_ERR(path);
+
+ ssymname = kmalloc(SHFLSTRING_HEADER_SIZE + symname_size, GFP_KERNEL);
+ if (!ssymname) {
+ __putname(path);
+ return -ENOMEM;
+ }
+ ssymname->length = symname_size - 1;
+ ssymname->size = symname_size;
+ memcpy(ssymname->string.utf8, symname, symname_size);
+
+ err = vboxsf_symlink(sf_g->root, path, ssymname, &info);
+ kfree(ssymname);
+ __putname(path);
+ if (err)
+ return err;
+
+ err = sf_instantiate(parent, dentry, &info, SHFL_HANDLE_NIL);
+ if (err)
+ return err;
+
+ /* parent directory access/change time changed */
+ sf_parent_i->force_restat = 1;
+ return 0;
+}
+
+const struct inode_operations vboxsf_dir_iops = {
+ .lookup = sf_lookup,
+ .create = sf_create,
+ .mkdir = sf_mkdir,
+ .rmdir = sf_rmdir,
+ .unlink = sf_unlink,
+ .rename = sf_rename,
+ .getattr = vboxsf_getattr,
+ .setattr = vboxsf_setattr,
+ .symlink = sf_symlink
+};
diff --git a/fs/vboxsf/file.c b/fs/vboxsf/file.c
new file mode 100644
index 000000000000..7123e2dea4db
--- /dev/null
+++ b/fs/vboxsf/file.c
@@ -0,0 +1,414 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VirtualBox Guest Shared Folders support: Regular file inode and file ops.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/sizes.h>
+#include "vfsmod.h"
+
+/**
+ * Read from a regular file.
+ * Return: The number of bytes read on success, negative errno value otherwise
+ * @file the file
+ * @buf the buffer
+ * @size length of the buffer
+ * @off offset within the file
+ */
+static ssize_t sf_reg_read(struct file *file, char *buf, size_t size,
+ loff_t *off)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(file_inode(file)->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ u64 pos = *off;
+ u32 nread;
+ int err;
+
+ if (!size)
+ return 0;
+
+ if (size > SHFL_MAX_RW_COUNT)
+ nread = SHFL_MAX_RW_COUNT;
+ else
+ nread = size;
+
+ err = vboxsf_read(sf_g->root, sf_r->handle, pos, &nread, buf, true);
+ if (err)
+ return err;
+
+ *off += nread;
+ return nread;
+}
+
+/**
+ * Write to a regular file.
+ * Return: The number of bytes written on success, negative errno val otherwise
+ * @file the file
+ * @buf the buffer
+ * @size length of the buffer
+ * @off offset within the file
+ */
+static ssize_t sf_reg_write(struct file *file, const char *buf, size_t size,
+ loff_t *off)
+{
+ struct inode *inode = file_inode(file);
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ u32 nwritten;
+ u64 pos;
+ int err;
+
+ pos = *off;
+ if (file->f_flags & O_APPEND) {
+ pos = inode->i_size;
+ *off = pos;
+ }
+
+ if (!size)
+ return 0;
+
+ if (size > SHFL_MAX_RW_COUNT)
+ nwritten = SHFL_MAX_RW_COUNT;
+ else
+ nwritten = size;
+
+ err = vboxsf_write(sf_g->root, sf_r->handle, pos, &nwritten, buf, true);
+ if (err)
+ return err;
+
+ *off += nwritten;
+ if (*off > inode->i_size)
+ i_size_write(inode, *off);
+
+ /* size changed */
+ sf_i->force_restat = 1;
+ return nwritten;
+}
+
+/**
+ * Open a regular file.
+ * Return: 0 or negative errno value.
+ * @inode inode
+ * @file file
+ */
+static int sf_reg_open(struct inode *inode, struct file *file)
+{
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+ struct shfl_createparms params = {};
+ struct sf_reg_info *sf_r;
+ int err;
+
+ sf_r = kmalloc(sizeof(*sf_r), GFP_KERNEL);
+ if (!sf_r)
+ return -ENOMEM;
+
+ /* Already open? */
+ if (sf_i->handle != SHFL_HANDLE_NIL) {
+ sf_r->handle = sf_i->handle;
+ sf_i->handle = SHFL_HANDLE_NIL;
+ sf_i->file = file;
+ file->private_data = sf_r;
+ return 0;
+ }
+
+ /*
+ * We check the value of params.handle afterwards to find out if
+ * the call succeeded or failed, as the API does not seem to cleanly
+ * distinguish error and informational messages.
+ *
+ * Furthermore, we must set params.handle to SHFL_HANDLE_NIL to
+ * make the shared folders host service use our mode parameter.
+ */
+ params.handle = SHFL_HANDLE_NIL;
+ if (file->f_flags & O_CREAT) {
+ params.create_flags |= SHFL_CF_ACT_CREATE_IF_NEW;
+ /*
+ * We ignore O_EXCL, as the Linux kernel seems to call create
+ * beforehand itself, so O_EXCL should always fail.
+ */
+ if (file->f_flags & O_TRUNC)
+ params.create_flags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
+ else
+ params.create_flags |= SHFL_CF_ACT_OPEN_IF_EXISTS;
+ } else {
+ params.create_flags |= SHFL_CF_ACT_FAIL_IF_NEW;
+ if (file->f_flags & O_TRUNC)
+ params.create_flags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
+ }
+
+ switch (file->f_flags & O_ACCMODE) {
+ case O_RDONLY:
+ params.create_flags |= SHFL_CF_ACCESS_READ;
+ break;
+
+ case O_WRONLY:
+ params.create_flags |= SHFL_CF_ACCESS_WRITE;
+ break;
+
+ case O_RDWR:
+ params.create_flags |= SHFL_CF_ACCESS_READWRITE;
+ break;
+
+ default:
+ WARN_ON(1);
+ }
+
+ if (file->f_flags & O_APPEND)
+ params.create_flags |= SHFL_CF_ACCESS_APPEND;
+
+ params.info.attr.mode = inode->i_mode;
+
+ err = vboxsf_create_at_dentry(file_dentry(file), &params);
+ if (err == 0 && params.handle == SHFL_HANDLE_NIL)
+ err = (params.result == SHFL_FILE_EXISTS) ? -EEXIST : -ENOENT;
+ if (err) {
+ kfree(sf_r);
+ return err;
+ }
+
+ /* the host may have given us different attr then requested */
+ sf_i->force_restat = 1;
+ sf_r->handle = params.handle;
+ sf_i->file = file;
+ file->private_data = sf_r;
+ return 0;
+}
+
+/**
+ * Close a regular file.
+ * Return: 0 or negative errno value.
+ * @inode inode
+ * @file file
+ */
+static int sf_reg_release(struct inode *inode, struct file *file)
+{
+ struct sf_reg_info *sf_r;
+ struct sf_glob_info *sf_g;
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+
+ sf_g = GET_GLOB_INFO(inode->i_sb);
+ sf_r = file->private_data;
+
+ filemap_write_and_wait(inode->i_mapping);
+
+ vboxsf_close(sf_g->root, sf_r->handle);
+
+ kfree(sf_r);
+ sf_i->file = NULL;
+ sf_i->handle = SHFL_HANDLE_NIL;
+ file->private_data = NULL;
+ return 0;
+}
+
+static int sf_reg_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct file *file = vma->vm_file;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(file_inode(file)->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ u32 nread = PAGE_SIZE;
+ struct page *page;
+ u64 off;
+ u8 *buf;
+ int err;
+
+ if (vmf->pgoff > vma->vm_end)
+ return VM_FAULT_SIGBUS;
+
+ /* No GFP_HIGHUSER, the page must have a valid virtual address. */
+ page = alloc_page(GFP_USER);
+ if (!page)
+ return VM_FAULT_OOM;
+
+ buf = kmap(page);
+ off = (vmf->pgoff << PAGE_SHIFT);
+ err = vboxsf_read(sf_g->root, sf_r->handle, off, &nread, buf, false);
+ if (err) {
+ kunmap(page);
+ put_page(page);
+ return VM_FAULT_SIGBUS;
+ }
+
+ if (!nread)
+ clear_user_page(page_address(page), vmf->pgoff, page);
+ else
+ memset(buf + nread, 0, PAGE_SIZE - nread);
+
+ flush_dcache_page(page);
+ kunmap(page);
+ vmf->page = page;
+ return 0;
+}
+
+static const struct vm_operations_struct sf_vma_ops = {
+ .fault = sf_reg_fault
+};
+
+static int sf_reg_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ if (vma->vm_flags & VM_SHARED)
+ return -EINVAL;
+
+ vma->vm_ops = &sf_vma_ops;
+ return 0;
+}
+
+const struct file_operations vboxsf_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 vboxsf_reg_iops = {
+ .getattr = vboxsf_getattr,
+ .setattr = vboxsf_setattr
+};
+
+static int sf_readpage(struct file *file, struct page *page)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(file_inode(file)->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ u64 off = page_offset(page);
+ u32 nread = PAGE_SIZE;
+ u8 *buf;
+ int err;
+
+ buf = kmap(page);
+
+ err = vboxsf_read(sf_g->root, sf_r->handle, off, &nread, buf, false);
+ if (err == 0) {
+ memset(&buf[nread], 0, PAGE_SIZE - nread);
+ flush_dcache_page(page);
+ SetPageUptodate(page);
+ } else {
+ SetPageError(page);
+ }
+
+ kunmap(page);
+ unlock_page(page);
+ return err;
+}
+
+static int sf_writepage(struct page *page, struct writeback_control *wbc)
+{
+ struct address_space *mapping = page->mapping;
+ struct inode *inode = mapping->host;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
+ struct file *file = sf_i->file;
+ struct sf_reg_info *sf_r = file->private_data;
+ int end_index = inode->i_size >> PAGE_SHIFT;
+ u64 off = page_offset(page);
+ u32 nwrite = PAGE_SIZE;
+ u8 *buf;
+ int err;
+
+ if (page->index >= end_index)
+ nwrite = inode->i_size & (PAGE_SIZE - 1);
+
+ buf = kmap(page);
+ err = vboxsf_write(sf_g->root, sf_r->handle, off, &nwrite, buf, false);
+ kunmap(page);
+
+ if (err == 0)
+ ClearPageError(page);
+ else
+ ClearPageUptodate(page);
+
+ unlock_page(page);
+ return err;
+}
+
+int sf_write_begin(struct file *file, struct address_space *mapping, loff_t pos,
+ unsigned int len, unsigned int flags, struct page **pagep,
+ void **fsdata)
+{
+ return simple_write_begin(file, mapping, pos, len, flags, pagep,
+ fsdata);
+}
+
+int sf_write_end(struct file *file, struct address_space *mapping, loff_t pos,
+ unsigned int len, unsigned int copied, struct page *page,
+ void *fsdata)
+{
+ struct inode *inode = mapping->host;
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct sf_reg_info *sf_r = file->private_data;
+ unsigned int from = pos & (PAGE_SIZE - 1);
+ u32 nwritten = len;
+ u8 *buf;
+ int err;
+
+ buf = kmap(page);
+ err = vboxsf_write(sf_g->root, sf_r->handle, pos, &nwritten,
+ buf + from, false);
+ kunmap(page);
+
+ if (err)
+ goto out;
+
+ if (!PageUptodate(page) && nwritten == PAGE_SIZE)
+ SetPageUptodate(page);
+
+ pos += nwritten;
+ if (pos > inode->i_size)
+ i_size_write(inode, pos);
+
+out:
+ unlock_page(page);
+ put_page(page);
+
+ return err;
+}
+
+const struct address_space_operations vboxsf_reg_aops = {
+ .readpage = sf_readpage,
+ .writepage = sf_writepage,
+ .write_begin = sf_write_begin,
+ .write_end = sf_write_end,
+};
+
+static const char *sf_get_link(struct dentry *dentry, struct inode *inode,
+ struct delayed_call *done)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
+ struct shfl_string *path;
+ char *link;
+ int err;
+
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+
+ path = vboxsf_path_from_dentry(sf_g, dentry);
+ if (IS_ERR(path))
+ return (char *)path;
+
+ link = kzalloc(PATH_MAX, GFP_KERNEL);
+ if (!link) {
+ __putname(path);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ err = vboxsf_readlink(sf_g->root, path, PATH_MAX, link);
+ __putname(path);
+ if (err) {
+ kfree(link);
+ return ERR_PTR(err);
+ }
+
+ set_delayed_call(done, kfree_link, link);
+ return link;
+}
+
+const struct inode_operations vboxsf_lnk_iops = {
+ .get_link = sf_get_link
+};
diff --git a/fs/vboxsf/shfl_hostintf.h b/fs/vboxsf/shfl_hostintf.h
new file mode 100644
index 000000000000..8666a5347a0b
--- /dev/null
+++ b/fs/vboxsf/shfl_hostintf.h
@@ -0,0 +1,919 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */
+/*
+ * VirtualBox Shared Folders: host interface definition.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#ifndef SHFL_HOSTINTF_H
+#define SHFL_HOSTINTF_H
+
+#include <linux/vbox_vmmdev_types.h>
+
+/* The max in/out buffer size for a FN_READ or FN_WRITE call */
+#define SHFL_MAX_RW_COUNT (16 * SZ_1M)
+
+/*
+ * Structures shared between guest and the service
+ * can be relocated and use offsets to point to variable
+ * length parts.
+ *
+ * Shared folders protocol works with handles.
+ * Before doing any action on a file system object,
+ * one have to obtain the object handle via a SHFL_FN_CREATE
+ * request. A handle must be closed with SHFL_FN_CLOSE.
+ */
+
+/* Query mappings changes. */
+#define SHFL_FN_QUERY_MAPPINGS (1)
+/* Query mappings changes. */
+#define SHFL_FN_QUERY_MAP_NAME (2)
+/* Open/create object. */
+#define SHFL_FN_CREATE (3)
+/* Close object handle. */
+#define SHFL_FN_CLOSE (4)
+/* Read object content. */
+#define SHFL_FN_READ (5)
+/* Write new object content. */
+#define SHFL_FN_WRITE (6)
+/* Lock/unlock a range in the object. */
+#define SHFL_FN_LOCK (7)
+/* List object content. */
+#define SHFL_FN_LIST (8)
+/* Query/set object information. */
+#define SHFL_FN_INFORMATION (9)
+/* Remove object */
+#define SHFL_FN_REMOVE (11)
+/* Map folder (legacy) */
+#define SHFL_FN_MAP_FOLDER_OLD (12)
+/* Unmap folder */
+#define SHFL_FN_UNMAP_FOLDER (13)
+/* Rename object (possibly moving it to another directory) */
+#define SHFL_FN_RENAME (14)
+/* Flush file */
+#define SHFL_FN_FLUSH (15)
+#define SHFL_FN_SET_UTF8 (16)
+#define SHFL_CPARMS_SET_UTF8 0
+/* Map folder */
+#define SHFL_FN_MAP_FOLDER (17)
+/* Read symlink destination (as of VBox 4.0) */
+#define SHFL_FN_READLINK (18)
+/* Create symlink (as of VBox 4.0) */
+#define SHFL_FN_SYMLINK (19)
+/* Ask host to show symlinks (as of VBox 4.0) */
+#define SHFL_FN_SET_SYMLINKS (20)
+#define SHFL_CPARMS_SET_SYMLINKS 0
+
+/* Root handles for a mapping are of type u32, Root handles are unique. */
+#define SHFL_ROOT_NIL ((u32)~0)
+
+/* Shared folders handle for an opened object are of type u64. */
+#define SHFL_HANDLE_NIL ((u64)~0LL)
+#define SHFL_HANDLE_ROOT ((u64)0LL)
+
+/* Hardcoded maximum length (in chars) of a shared folder name. */
+#define SHFL_MAX_LEN (256)
+/* Hardcoded maximum number of shared folder mapping available to the guest. */
+#define SHFL_MAX_MAPPINGS (64)
+
+/** Shared folder string buffer structure. */
+struct shfl_string {
+ /** Allocated size of the string member in bytes. */
+ u16 size;
+
+ /** Length of string without trailing nul in bytes. */
+ u16 length;
+
+ /** UTF-8 or UTF-16 string. Nul terminated. */
+ union {
+ u8 utf8[1];
+ u16 utf16[1];
+ u16 ucs2[1]; /* misnomer, use utf16. */
+ } string;
+};
+VMMDEV_ASSERT_SIZE(shfl_string, 6);
+
+/* The size of shfl_string w/o the string part. */
+#define SHFLSTRING_HEADER_SIZE 4
+
+/* Calculate size of the string. */
+static inline u32 shfl_string_buf_size(const struct shfl_string *string)
+{
+ return string ? SHFLSTRING_HEADER_SIZE + string->size : 0;
+}
+
+/* Set user id on execution (S_ISUID). */
+#define SHFL_UNIX_ISUID 0004000U
+/* Set group id on execution (S_ISGID). */
+#define SHFL_UNIX_ISGID 0002000U
+/* Sticky bit (S_ISVTX / S_ISTXT). */
+#define SHFL_UNIX_ISTXT 0001000U
+
+/* Owner readable (S_IRUSR). */
+#define SHFL_UNIX_IRUSR 0000400U
+/* Owner writable (S_IWUSR). */
+#define SHFL_UNIX_IWUSR 0000200U
+/* Owner executable (S_IXUSR). */
+#define SHFL_UNIX_IXUSR 0000100U
+
+/* Group readable (S_IRGRP). */
+#define SHFL_UNIX_IRGRP 0000040U
+/* Group writable (S_IWGRP). */
+#define SHFL_UNIX_IWGRP 0000020U
+/* Group executable (S_IXGRP). */
+#define SHFL_UNIX_IXGRP 0000010U
+
+/* Other readable (S_IROTH). */
+#define SHFL_UNIX_IROTH 0000004U
+/* Other writable (S_IWOTH). */
+#define SHFL_UNIX_IWOTH 0000002U
+/* Other executable (S_IXOTH). */
+#define SHFL_UNIX_IXOTH 0000001U
+
+/* Named pipe (fifo) (S_IFIFO). */
+#define SHFL_TYPE_FIFO 0010000U
+/* Character device (S_IFCHR). */
+#define SHFL_TYPE_DEV_CHAR 0020000U
+/* Directory (S_IFDIR). */
+#define SHFL_TYPE_DIRECTORY 0040000U
+/* Block device (S_IFBLK). */
+#define SHFL_TYPE_DEV_BLOCK 0060000U
+/* Regular file (S_IFREG). */
+#define SHFL_TYPE_FILE 0100000U
+/* Symbolic link (S_IFLNK). */
+#define SHFL_TYPE_SYMLINK 0120000U
+/* Socket (S_IFSOCK). */
+#define SHFL_TYPE_SOCKET 0140000U
+/* Whiteout (S_IFWHT). */
+#define SHFL_TYPE_WHITEOUT 0160000U
+/* Type mask (S_IFMT). */
+#define SHFL_TYPE_MASK 0170000U
+
+/* Checks the mode flags indicate a directory (S_ISDIR). */
+#define SHFL_IS_DIRECTORY(m) (((m) & SHFL_TYPE_MASK) == SHFL_TYPE_DIRECTORY)
+/* Checks the mode flags indicate a symbolic link (S_ISLNK). */
+#define SHFL_IS_SYMLINK(m) (((m) & SHFL_TYPE_MASK) == SHFL_TYPE_SYMLINK)
+
+/** The available additional information in a shfl_fsobjattr object. */
+enum shfl_fsobjattr_add {
+ /** No additional information is available / requested. */
+ SHFLFSOBJATTRADD_NOTHING = 1,
+ /**
+ * The additional unix attributes (shfl_fsobjattr::u::unix_attr) are
+ * available / requested.
+ */
+ SHFLFSOBJATTRADD_UNIX,
+ /**
+ * The additional extended attribute size (shfl_fsobjattr::u::size) is
+ * available / requested.
+ */
+ SHFLFSOBJATTRADD_EASIZE,
+ /**
+ * The last valid item (inclusive).
+ * The valid range is SHFLFSOBJATTRADD_NOTHING thru
+ * SHFLFSOBJATTRADD_LAST.
+ */
+ SHFLFSOBJATTRADD_LAST = SHFLFSOBJATTRADD_EASIZE,
+
+ /** The usual 32-bit hack. */
+ SHFLFSOBJATTRADD_32BIT_SIZE_HACK = 0x7fffffff
+};
+
+/**
+ * Additional unix Attributes, these are available when
+ * shfl_fsobjattr.additional == SHFLFSOBJATTRADD_UNIX.
+ */
+struct shfl_fsobjattr_unix {
+ /**
+ * The user owning the filesystem object (st_uid).
+ * This field is ~0U if not supported.
+ */
+ u32 uid;
+
+ /**
+ * The group the filesystem object is assigned (st_gid).
+ * This field is ~0U if not supported.
+ */
+ u32 gid;
+
+ /**
+ * Number of hard links to this filesystem object (st_nlink).
+ * This field is 1 if the filesystem doesn't support hardlinking or
+ * the information isn't available.
+ */
+ u32 hardlinks;
+
+ /**
+ * The device number of the device which this filesystem object resides
+ * on (st_dev). This field is 0 if this information is not available.
+ */
+ u32 inode_id_device;
+
+ /**
+ * The unique identifier (within the filesystem) of this filesystem
+ * object (st_ino). Together with inode_id_device, this field can be
+ * used as a OS wide unique id, when both their values are not 0.
+ * This field is 0 if the information is not available.
+ */
+ u64 inode_id;
+
+ /**
+ * User flags (st_flags).
+ * This field is 0 if this information is not available.
+ */
+ u32 flags;
+
+ /**
+ * The current generation number (st_gen).
+ * This field is 0 if this information is not available.
+ */
+ u32 generation_id;
+
+ /**
+ * The device number of a char. or block device type object (st_rdev).
+ * This field is 0 if the file isn't a char. or block device or when
+ * the OS doesn't use the major+minor device idenfication scheme.
+ */
+ u32 device;
+} __packed;
+
+/** Extended attribute size. */
+struct shfl_fsobjattr_easize {
+ /** Size of EAs. */
+ s64 cb;
+} __packed;
+
+/** Shared folder filesystem object attributes. */
+struct shfl_fsobjattr {
+ /** Mode flags (st_mode). SHFL_UNIX_*, SHFL_TYPE_*, and SHFL_DOS_*. */
+ u32 mode;
+
+ /** The additional attributes available. */
+ enum shfl_fsobjattr_add additional;
+
+ /**
+ * Additional attributes.
+ *
+ * Unless explicitly specified to an API, the API can provide additional
+ * data as it is provided by the underlying OS.
+ */
+ union {
+ struct shfl_fsobjattr_unix unix_attr;
+ struct shfl_fsobjattr_easize size;
+ } __packed u;
+} __packed;
+VMMDEV_ASSERT_SIZE(shfl_fsobjattr, 44);
+
+struct shfl_timespec {
+ s64 ns_relative_to_unix_epoch;
+};
+
+/** Filesystem object information structure. */
+struct shfl_fsobjinfo {
+ /**
+ * Logical size (st_size).
+ * For normal files this is the size of the file.
+ * For symbolic links, this is the length of the path name contained
+ * in the symbolic link.
+ * For other objects this fields needs to be specified.
+ */
+ s64 size;
+
+ /** Disk allocation size (st_blocks * DEV_BSIZE). */
+ s64 allocated;
+
+ /** Time of last access (st_atime). */
+ struct shfl_timespec access_time;
+
+ /** Time of last data modification (st_mtime). */
+ struct shfl_timespec modification_time;
+
+ /**
+ * Time of last status change (st_ctime).
+ * If not available this is set to modification_time.
+ */
+ struct shfl_timespec change_time;
+
+ /**
+ * Time of file birth (st_birthtime).
+ * If not available this is set to change_time.
+ */
+ struct shfl_timespec birth_time;
+
+ /** Attributes. */
+ struct shfl_fsobjattr attr;
+
+} __packed;
+VMMDEV_ASSERT_SIZE(shfl_fsobjinfo, 92);
+
+/**
+ * result of an open/create request.
+ * Along with handle value the result code
+ * identifies what has happened while
+ * trying to open the object.
+ */
+enum shfl_create_result {
+ SHFL_NO_RESULT,
+ /** Specified path does not exist. */
+ SHFL_PATH_NOT_FOUND,
+ /** Path to file exists, but the last component does not. */
+ SHFL_FILE_NOT_FOUND,
+ /** File already exists and either has been opened or not. */
+ SHFL_FILE_EXISTS,
+ /** New file was created. */
+ SHFL_FILE_CREATED,
+ /** Existing file was replaced or overwritten. */
+ SHFL_FILE_REPLACED
+};
+
+/* No flags. Initialization value. */
+#define SHFL_CF_NONE (0x00000000)
+
+/*
+ * Only lookup the object, do not return a handle. When this is set all other
+ * flags are ignored.
+ */
+#define SHFL_CF_LOOKUP (0x00000001)
+
+/*
+ * Open parent directory of specified object.
+ * Useful for the corresponding Windows FSD flag
+ * and for opening paths like \\dir\\*.* to search the 'dir'.
+ */
+#define SHFL_CF_OPEN_TARGET_DIRECTORY (0x00000002)
+
+/* Create/open a directory. */
+#define SHFL_CF_DIRECTORY (0x00000004)
+
+/*
+ * Open/create action to do if object exists
+ * and if the object does not exists.
+ * REPLACE file means atomically DELETE and CREATE.
+ * OVERWRITE file means truncating the file to 0 and
+ * setting new size.
+ * When opening an existing directory REPLACE and OVERWRITE
+ * actions are considered invalid, and cause returning
+ * FILE_EXISTS with NIL handle.
+ */
+#define SHFL_CF_ACT_MASK_IF_EXISTS (0x000000f0)
+#define SHFL_CF_ACT_MASK_IF_NEW (0x00000f00)
+
+/* What to do if object exists. */
+#define SHFL_CF_ACT_OPEN_IF_EXISTS (0x00000000)
+#define SHFL_CF_ACT_FAIL_IF_EXISTS (0x00000010)
+#define SHFL_CF_ACT_REPLACE_IF_EXISTS (0x00000020)
+#define SHFL_CF_ACT_OVERWRITE_IF_EXISTS (0x00000030)
+
+/* What to do if object does not exist. */
+#define SHFL_CF_ACT_CREATE_IF_NEW (0x00000000)
+#define SHFL_CF_ACT_FAIL_IF_NEW (0x00000100)
+
+/* Read/write requested access for the object. */
+#define SHFL_CF_ACCESS_MASK_RW (0x00003000)
+
+/* No access requested. */
+#define SHFL_CF_ACCESS_NONE (0x00000000)
+/* Read access requested. */
+#define SHFL_CF_ACCESS_READ (0x00001000)
+/* Write access requested. */
+#define SHFL_CF_ACCESS_WRITE (0x00002000)
+/* Read/Write access requested. */
+#define SHFL_CF_ACCESS_READWRITE (0x00003000)
+
+/* Requested share access for the object. */
+#define SHFL_CF_ACCESS_MASK_DENY (0x0000c000)
+
+/* Allow any access. */
+#define SHFL_CF_ACCESS_DENYNONE (0x00000000)
+/* Do not allow read. */
+#define SHFL_CF_ACCESS_DENYREAD (0x00004000)
+/* Do not allow write. */
+#define SHFL_CF_ACCESS_DENYWRITE (0x00008000)
+/* Do not allow access. */
+#define SHFL_CF_ACCESS_DENYALL (0x0000c000)
+
+/* Requested access to attributes of the object. */
+#define SHFL_CF_ACCESS_MASK_ATTR (0x00030000)
+
+/* No access requested. */
+#define SHFL_CF_ACCESS_ATTR_NONE (0x00000000)
+/* Read access requested. */
+#define SHFL_CF_ACCESS_ATTR_READ (0x00010000)
+/* Write access requested. */
+#define SHFL_CF_ACCESS_ATTR_WRITE (0x00020000)
+/* Read/Write access requested. */
+#define SHFL_CF_ACCESS_ATTR_READWRITE (0x00030000)
+
+/*
+ * The file is opened in append mode.
+ * Ignored if SHFL_CF_ACCESS_WRITE is not set.
+ */
+#define SHFL_CF_ACCESS_APPEND (0x00040000)
+
+/** Create parameters buffer struct for SHFL_FN_CREATE call */
+struct shfl_createparms {
+ /** Returned handle of opened object. */
+ u64 handle;
+
+ /** Returned result of the operation */
+ enum shfl_create_result result;
+
+ /** SHFL_CF_* */
+ u32 create_flags;
+
+ /**
+ * Attributes of object to create and
+ * returned actual attributes of opened/created object.
+ */
+ struct shfl_fsobjinfo info;
+} __packed;
+
+/** Shared Folder directory information */
+struct shfl_dirinfo {
+ /** Full information about the object. */
+ struct shfl_fsobjinfo info;
+ /**
+ * The length of the short field (number of UTF16 chars).
+ * It is 16-bit for reasons of alignment.
+ */
+ u16 short_name_len;
+ /**
+ * The short name for 8.3 compatibility.
+ * Empty string if not available.
+ */
+ u16 short_name[14];
+ struct shfl_string name;
+};
+
+/** Shared folder filesystem properties. */
+struct shfl_fsproperties {
+ /**
+ * The maximum size of a filesystem object name.
+ * This does not include the '\\0'.
+ */
+ u32 max_component_len;
+
+ /**
+ * True if the filesystem is remote.
+ * False if the filesystem is local.
+ */
+ bool remote;
+
+ /**
+ * True if the filesystem is case sensitive.
+ * False if the filesystem is case insensitive.
+ */
+ bool case_sensitive;
+
+ /**
+ * True if the filesystem is mounted read only.
+ * False if the filesystem is mounted read write.
+ */
+ bool read_only;
+
+ /**
+ * True if the filesystem can encode unicode object names.
+ * False if it can't.
+ */
+ bool supports_unicode;
+
+ /**
+ * True if the filesystem is compresses.
+ * False if it isn't or we don't know.
+ */
+ bool compressed;
+
+ /**
+ * True if the filesystem compresses of individual files.
+ * False if it doesn't or we don't know.
+ */
+ bool file_compression;
+};
+VMMDEV_ASSERT_SIZE(shfl_fsproperties, 12);
+
+struct shfl_volinfo {
+ s64 total_allocation_bytes;
+ s64 available_allocation_bytes;
+ u32 bytes_per_allocation_unit;
+ u32 bytes_per_sector;
+ u32 serial;
+ struct shfl_fsproperties properties;
+};
+
+
+/** SHFL_FN_MAP_FOLDER Parameters structure. */
+struct shfl_map_folder {
+ /**
+ * pointer, in:
+ * Points to struct shfl_string buffer.
+ */
+ struct vmmdev_hgcm_function_parameter path;
+
+ /**
+ * pointer, out: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * pointer, in: UTF16
+ * Path delimiter
+ */
+ struct vmmdev_hgcm_function_parameter delimiter;
+
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Case senstive flag
+ */
+ struct vmmdev_hgcm_function_parameter case_sensitive;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_MAP_FOLDER (4)
+
+
+/** SHFL_FN_UNMAP_FOLDER Parameters structure. */
+struct shfl_unmap_folder {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_UNMAP_FOLDER (1)
+
+
+/** SHFL_FN_CREATE Parameters structure. */
+struct shfl_create {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string buffer.
+ */
+ struct vmmdev_hgcm_function_parameter path;
+
+ /**
+ * pointer, in/out:
+ * Points to struct shfl_createparms buffer.
+ */
+ struct vmmdev_hgcm_function_parameter parms;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_CREATE (3)
+
+
+/** SHFL_FN_CLOSE Parameters structure. */
+struct shfl_close {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE (u64) of object to close.
+ */
+ struct vmmdev_hgcm_function_parameter handle;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_CLOSE (2)
+
+
+/** SHFL_FN_READ Parameters structure. */
+struct shfl_read {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE (u64) of object to read from.
+ */
+ struct vmmdev_hgcm_function_parameter handle;
+
+ /**
+ * value64, in:
+ * Offset to read from.
+ */
+ struct vmmdev_hgcm_function_parameter offset;
+
+ /**
+ * value64, in/out:
+ * Bytes to read/How many were read.
+ */
+ struct vmmdev_hgcm_function_parameter cb;
+
+ /**
+ * pointer, out:
+ * Buffer to place data to.
+ */
+ struct vmmdev_hgcm_function_parameter buffer;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_READ (5)
+
+
+/** SHFL_FN_WRITE Parameters structure. */
+struct shfl_write {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE (u64) of object to write to.
+ */
+ struct vmmdev_hgcm_function_parameter handle;
+
+ /**
+ * value64, in:
+ * Offset to write to.
+ */
+ struct vmmdev_hgcm_function_parameter offset;
+
+ /**
+ * value64, in/out:
+ * Bytes to write/How many were written.
+ */
+ struct vmmdev_hgcm_function_parameter cb;
+
+ /**
+ * pointer, in:
+ * Data to write.
+ */
+ struct vmmdev_hgcm_function_parameter buffer;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_WRITE (5)
+
+
+/*
+ * SHFL_FN_LIST
+ * Listing information includes variable length RTDIRENTRY[EX] structures.
+ */
+
+#define SHFL_LIST_NONE 0
+#define SHFL_LIST_RETURN_ONE 1
+
+/** SHFL_FN_LIST Parameters structure. */
+struct shfl_list {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE (u64) of object to be listed.
+ */
+ struct vmmdev_hgcm_function_parameter handle;
+
+ /**
+ * value32, in:
+ * List flags SHFL_LIST_*.
+ */
+ struct vmmdev_hgcm_function_parameter flags;
+
+ /**
+ * value32, in/out:
+ * Bytes to be used for listing information/How many bytes were used.
+ */
+ struct vmmdev_hgcm_function_parameter cb;
+
+ /**
+ * pointer, in/optional
+ * Points to struct shfl_string buffer that specifies a search path.
+ */
+ struct vmmdev_hgcm_function_parameter path;
+
+ /**
+ * pointer, out:
+ * Buffer to place listing information to. (struct shfl_dirinfo)
+ */
+ struct vmmdev_hgcm_function_parameter buffer;
+
+ /**
+ * value32, in/out:
+ * Indicates a key where the listing must be resumed.
+ * in: 0 means start from begin of object.
+ * out: 0 means listing completed.
+ */
+ struct vmmdev_hgcm_function_parameter resume_point;
+
+ /**
+ * pointer, out:
+ * Number of files returned
+ */
+ struct vmmdev_hgcm_function_parameter file_count;
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_LIST (8)
+
+
+/** SHFL_FN_READLINK Parameters structure. */
+struct shfl_readLink {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string buffer.
+ */
+ struct vmmdev_hgcm_function_parameter path;
+
+ /**
+ * pointer, out:
+ * Buffer to place data to.
+ */
+ struct vmmdev_hgcm_function_parameter buffer;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_READLINK (3)
+
+
+/* SHFL_FN_INFORMATION */
+
+/* Mask of Set/Get bit. */
+#define SHFL_INFO_MODE_MASK (0x1)
+/* Get information */
+#define SHFL_INFO_GET (0x0)
+/* Set information */
+#define SHFL_INFO_SET (0x1)
+
+/* Get name of the object. */
+#define SHFL_INFO_NAME (0x2)
+/* Set size of object (extend/trucate); only applies to file objects */
+#define SHFL_INFO_SIZE (0x4)
+/* Get/Set file object info. */
+#define SHFL_INFO_FILE (0x8)
+/* Get volume information. */
+#define SHFL_INFO_VOLUME (0x10)
+
+/** SHFL_FN_INFORMATION Parameters structure. */
+struct shfl_information {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * value64, in:
+ * SHFLHANDLE (u64) of object to be listed.
+ */
+ struct vmmdev_hgcm_function_parameter handle;
+
+ /**
+ * value32, in:
+ * SHFL_INFO_*
+ */
+ struct vmmdev_hgcm_function_parameter flags;
+
+ /**
+ * value32, in/out:
+ * Bytes to be used for information/How many bytes were used.
+ */
+ struct vmmdev_hgcm_function_parameter cb;
+
+ /**
+ * pointer, in/out:
+ * Information to be set/get (shfl_fsobjinfo or shfl_string). Do not
+ * forget to set the shfl_fsobjinfo::attr::additional for a get
+ * operation as well.
+ */
+ struct vmmdev_hgcm_function_parameter info;
+
+};
+
+/* Number of parameters */
+#define SHFL_CPARMS_INFORMATION (5)
+
+
+/* SHFL_FN_REMOVE */
+
+#define SHFL_REMOVE_FILE (0x1)
+#define SHFL_REMOVE_DIR (0x2)
+#define SHFL_REMOVE_SYMLINK (0x4)
+
+/** SHFL_FN_REMOVE Parameters structure. */
+struct shfl_remove {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string buffer.
+ */
+ struct vmmdev_hgcm_function_parameter path;
+
+ /**
+ * value32, in:
+ * remove flags (file/directory)
+ */
+ struct vmmdev_hgcm_function_parameter flags;
+
+};
+
+#define SHFL_CPARMS_REMOVE (3)
+
+
+/* SHFL_FN_RENAME */
+
+#define SHFL_RENAME_FILE (0x1)
+#define SHFL_RENAME_DIR (0x2)
+#define SHFL_RENAME_REPLACE_IF_EXISTS (0x4)
+
+/** SHFL_FN_RENAME Parameters structure. */
+struct shfl_rename {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string src.
+ */
+ struct vmmdev_hgcm_function_parameter src;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string dest.
+ */
+ struct vmmdev_hgcm_function_parameter dest;
+
+ /**
+ * value32, in:
+ * rename flags (file/directory)
+ */
+ struct vmmdev_hgcm_function_parameter flags;
+
+};
+
+#define SHFL_CPARMS_RENAME (4)
+
+
+/** SHFL_FN_SYMLINK Parameters structure. */
+struct shfl_symlink {
+ /**
+ * pointer, in: SHFLROOT (u32)
+ * Root handle of the mapping which name is queried.
+ */
+ struct vmmdev_hgcm_function_parameter root;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string of path for the new symlink.
+ */
+ struct vmmdev_hgcm_function_parameter new_path;
+
+ /**
+ * pointer, in:
+ * Points to struct shfl_string of destination for symlink.
+ */
+ struct vmmdev_hgcm_function_parameter old_path;
+
+ /**
+ * pointer, out:
+ * Information about created symlink.
+ */
+ struct vmmdev_hgcm_function_parameter info;
+
+};
+
+#define SHFL_CPARMS_SYMLINK (4)
+
+#endif
diff --git a/fs/vboxsf/super.c b/fs/vboxsf/super.c
new file mode 100644
index 000000000000..522f0599c8d9
--- /dev/null
+++ b/fs/vboxsf/super.c
@@ -0,0 +1,433 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VirtualBox Guest Shared Folders support: Virtual File System.
+ *
+ * Module initialization/finalization
+ * File system registration/deregistration
+ * Superblock reading
+ * Few utility functions
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/magic.h>
+#include <linux/module.h>
+#include <linux/nls.h>
+#include <linux/parser.h>
+#include <linux/statfs.h>
+#include <linux/vbox_utils.h>
+#include "vfsmod.h"
+
+#define VBSF_MOUNT_SIGNATURE_BYTE_0 ('\000')
+#define VBSF_MOUNT_SIGNATURE_BYTE_1 ('\377')
+#define VBSF_MOUNT_SIGNATURE_BYTE_2 ('\376')
+#define VBSF_MOUNT_SIGNATURE_BYTE_3 ('\375')
+
+static int follow_symlinks;
+module_param(follow_symlinks, int, 0444);
+MODULE_PARM_DESC(follow_symlinks,
+ "Let host resolve symlinks rather than showing them");
+
+struct read_super_args {
+ const char *dev_name;
+ char *options;
+};
+
+static struct super_operations sf_super_ops; /* forward declaration */
+static struct kmem_cache *sf_inode_cachep;
+
+static char * const vboxsf_default_nls = CONFIG_NLS_DEFAULT;
+
+enum { opt_name, opt_nls, opt_uid, opt_gid, opt_ttl, opt_dmode, opt_fmode,
+ opt_dmask, opt_fmask, opt_error };
+
+static const match_table_t vboxsf_tokens = {
+ { opt_nls, "nls=%s" },
+ { opt_uid, "uid=%u" },
+ { opt_gid, "gid=%u" },
+ { opt_ttl, "ttl=%u" },
+ { opt_dmode, "dmode=%o" },
+ { opt_fmode, "fmode=%o" },
+ { opt_dmask, "dmask=%o" },
+ { opt_fmask, "fmask=%o" },
+ { opt_error, NULL },
+};
+
+static int vboxsf_parse_options(struct sf_glob_info *sf_g, char *options)
+{
+ substring_t args[MAX_OPT_ARGS];
+ int value, token;
+ char *p;
+
+ if (!options)
+ goto out;
+
+ if (options[0] == VBSF_MOUNT_SIGNATURE_BYTE_0 &&
+ options[1] == VBSF_MOUNT_SIGNATURE_BYTE_1 &&
+ options[2] == VBSF_MOUNT_SIGNATURE_BYTE_2 &&
+ options[3] == VBSF_MOUNT_SIGNATURE_BYTE_3) {
+ vbg_err("vboxsf: Old binary mount data not supported, remove obsolete mount.vboxsf and/or update your VBoxService.\n");
+ return -EINVAL;
+ }
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ if (!*p)
+ continue;
+
+ token = match_token(p, vboxsf_tokens, args);
+ switch (token) {
+ case opt_nls:
+ if (sf_g->nls_name) {
+ vbg_err("vboxsf: Cannot change nls option\n");
+ return -EINVAL;
+ }
+ sf_g->nls_name = match_strdup(&args[0]);
+ if (!sf_g->nls_name)
+ return -ENOMEM;
+ break;
+ case opt_uid:
+ if (match_int(&args[0], &value))
+ return -EINVAL;
+ sf_g->uid = value;
+ break;
+ case opt_gid:
+ if (match_int(&args[0], &value))
+ return -EINVAL;
+ sf_g->gid = value;
+ break;
+ case opt_ttl:
+ if (match_int(&args[0], &value))
+ return -EINVAL;
+ sf_g->ttl = msecs_to_jiffies(value);
+ break;
+ case opt_dmode:
+ if (match_octal(&args[0], &value))
+ return -EINVAL;
+ sf_g->dmode = value;
+ break;
+ case opt_fmode:
+ if (match_octal(&args[0], &value))
+ return -EINVAL;
+ sf_g->fmode = value;
+ break;
+ case opt_dmask:
+ if (match_octal(&args[0], &value))
+ return -EINVAL;
+ sf_g->dmask = value;
+ break;
+ case opt_fmask:
+ if (match_octal(&args[0], &value))
+ return -EINVAL;
+ sf_g->fmask = value;
+ break;
+ default:
+ vbg_err("vboxsf: Unrecognized mount option \"%s\" or missing value\n",
+ p);
+ return -EINVAL;
+ }
+ }
+
+out:
+ if (!sf_g->nls_name)
+ sf_g->nls_name = vboxsf_default_nls;
+
+ return 0;
+}
+
+/*
+ * Called when vfs mounts the fs, should respect [flags],
+ * initializes [sb], initializes root inode and dentry.
+ */
+static int sf_read_super(struct super_block *sb, void *data, int flags)
+{
+ struct read_super_args *args = data;
+ struct shfl_string root_path;
+ struct sf_glob_info *sf_g;
+ struct dentry *droot;
+ struct inode *iroot;
+ size_t size;
+ int err;
+
+ if (flags & MS_REMOUNT)
+ return -EINVAL;
+
+ sf_g = kzalloc(sizeof(*sf_g), GFP_KERNEL);
+ if (!sf_g)
+ return -ENOMEM;
+
+ /* Turn dev_name into a shfl_string */
+ size = strlen(args->dev_name) + 1;
+ sf_g->name = kmalloc(SHFLSTRING_HEADER_SIZE + size, GFP_KERNEL);
+ if (!sf_g->name)
+ return -ENOMEM;
+ sf_g->name->size = size;
+ sf_g->name->length = size - 1;
+ strlcpy(sf_g->name->string.utf8, args->dev_name, size);
+
+ /* ~0 means use whatever the host gives as mode info */
+ sf_g->dmode = ~0;
+ sf_g->fmode = ~0;
+
+ err = vboxsf_parse_options(sf_g, args->options);
+ if (err)
+ goto fail_free;
+
+ /* Load nls if not utf8 */
+ if (strcmp(sf_g->nls_name, "utf8") != 0) {
+ if (sf_g->nls_name == vboxsf_default_nls)
+ sf_g->nls = load_nls_default();
+ else
+ sf_g->nls = load_nls(sf_g->nls_name);
+
+ if (!sf_g->nls) {
+ err = -EINVAL;
+ goto fail_free;
+ }
+ }
+
+ err = vboxsf_map_folder(sf_g->name, &sf_g->root);
+ if (err)
+ goto fail_free;
+
+ root_path.length = 1;
+ root_path.size = 2;
+ strlcpy(root_path.string.utf8, "/",
+ sizeof(root_path) - SHFLSTRING_HEADER_SIZE);
+ err = vboxsf_stat(sf_g, &root_path, &sf_g->root_info);
+ if (err)
+ goto fail_unmap;
+
+ sb->s_magic = 0xface;
+ sb->s_blocksize = 1024;
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_op = &sf_super_ops;
+
+ iroot = iget_locked(sb, 0);
+ if (!iroot) {
+ err = -ENOMEM;
+ goto fail_unmap;
+ }
+ vboxsf_init_inode(sf_g, iroot, &sf_g->root_info);
+ unlock_new_inode(iroot);
+
+ droot = d_make_root(iroot);
+ if (!droot) {
+ err = -ENOMEM;
+ goto fail_unmap;
+ }
+
+ sb->s_root = droot;
+ SET_GLOB_INFO(sb, sf_g);
+ return 0;
+
+fail_unmap:
+ vboxsf_unmap_folder(sf_g->root);
+fail_free:
+ if (sf_g->nls)
+ unload_nls(sf_g->nls);
+ if (sf_g->nls_name != vboxsf_default_nls)
+ kfree(sf_g->nls_name);
+ kfree(sf_g->name);
+ kfree(sf_g);
+ return err;
+}
+
+static void sf_inode_init_once(void *data)
+{
+ struct sf_inode_info *sf_i = (struct sf_inode_info *)data;
+
+ inode_init_once(&sf_i->vfs_inode);
+}
+
+static struct inode *sf_alloc_inode(struct super_block *sb)
+{
+ struct sf_inode_info *sf_i;
+
+ sf_i = kmem_cache_alloc(sf_inode_cachep, GFP_NOFS);
+ if (!sf_i)
+ return NULL;
+
+ sf_i->force_restat = 0;
+ sf_i->file = NULL;
+ sf_i->handle = SHFL_HANDLE_NIL;
+
+ return &sf_i->vfs_inode;
+}
+
+static void sf_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+
+ kmem_cache_free(sf_inode_cachep, GET_INODE_INFO(inode));
+}
+
+static void sf_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, sf_i_callback);
+}
+
+/*
+ * 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 = GET_GLOB_INFO(sb);
+
+ vboxsf_unmap_folder(sf_g->root);
+ if (sf_g->nls)
+ unload_nls(sf_g->nls);
+ if (sf_g->nls_name != vboxsf_default_nls)
+ kfree(sf_g->nls_name);
+ kfree(sf_g->name);
+ kfree(sf_g);
+}
+
+static int sf_statfs(struct dentry *dentry, struct kstatfs *stat)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct shfl_volinfo SHFLVolumeInfo;
+ struct sf_glob_info *sf_g;
+ u32 buf_len;
+ int err;
+
+ sf_g = GET_GLOB_INFO(sb);
+ buf_len = sizeof(SHFLVolumeInfo);
+ err = vboxsf_fsinfo(sf_g->root, 0, SHFL_INFO_GET | SHFL_INFO_VOLUME,
+ &buf_len, &SHFLVolumeInfo);
+ if (err)
+ return err;
+
+ stat->f_type = NFS_SUPER_MAGIC; /* XXX vboxsf type? */
+ stat->f_bsize = SHFLVolumeInfo.bytes_per_allocation_unit;
+
+ do_div(SHFLVolumeInfo.total_allocation_bytes,
+ SHFLVolumeInfo.bytes_per_allocation_unit);
+ stat->f_blocks = SHFLVolumeInfo.total_allocation_bytes;
+
+ do_div(SHFLVolumeInfo.available_allocation_bytes,
+ SHFLVolumeInfo.bytes_per_allocation_unit);
+ stat->f_bfree = SHFLVolumeInfo.available_allocation_bytes;
+ stat->f_bavail = SHFLVolumeInfo.available_allocation_bytes;
+
+ stat->f_files = 1000;
+ /*
+ * Don't return 0 here since the guest may then think that it is not
+ * possible to create any more files.
+ */
+ stat->f_ffree = 1000;
+ stat->f_fsid.val[0] = 0;
+ stat->f_fsid.val[1] = 0;
+ stat->f_namelen = 255;
+ return 0;
+}
+
+static int sf_remount_fs(struct super_block *sb, int *flags, char *options)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(sb);
+ struct inode *iroot;
+ int err;
+
+ err = vboxsf_parse_options(sf_g, options);
+ if (err)
+ return err;
+
+ iroot = ilookup(sb, 0);
+ if (!iroot)
+ return -ENOENT;
+
+ /* Apply changed options to the root inode */
+ vboxsf_init_inode(sf_g, iroot, &sf_g->root_info);
+
+ return 0;
+}
+
+static struct super_operations sf_super_ops = {
+ .alloc_inode = sf_alloc_inode,
+ .destroy_inode = sf_destroy_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)
+{
+ struct read_super_args args = {
+ .dev_name = dev_name,
+ .options = data,
+ };
+
+ return mount_nodev(fs_type, flags, &args, sf_read_super);
+}
+
+static struct file_system_type vboxsf_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "vboxsf",
+ .mount = sf_mount,
+ .kill_sb = kill_anon_super
+};
+
+/* Module initialization/finalization handlers */
+static int __init init(void)
+{
+ int err;
+
+ sf_inode_cachep = kmem_cache_create("vboxsf_inode_cache",
+ sizeof(struct sf_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ sf_inode_init_once);
+ if (sf_inode_cachep == NULL)
+ return -ENOMEM;
+
+ err = register_filesystem(&vboxsf_fs_type);
+ if (err)
+ return err;
+
+ err = vboxsf_connect();
+ if (err) {
+ vbg_err("vboxsf_connect error %d\n", err);
+ goto fail_unregisterfs;
+ }
+
+ err = vboxsf_set_utf8();
+ if (err) {
+ vbg_err("vboxsf_setutf8 error %d\n", err);
+ goto fail_disconnect;
+ }
+
+ if (!follow_symlinks) {
+ err = vboxsf_set_symlinks();
+ if (err)
+ vbg_warn("vboxsf: Unable to show symlinks: %d\n", err);
+ }
+
+ return 0;
+
+fail_disconnect:
+ vboxsf_disconnect();
+fail_unregisterfs:
+ unregister_filesystem(&vboxsf_fs_type);
+ return err;
+}
+
+static void __exit fini(void)
+{
+ vboxsf_disconnect();
+ unregister_filesystem(&vboxsf_fs_type);
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(sf_inode_cachep);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_DESCRIPTION("Oracle VM VirtualBox Module for Host File System Access");
+MODULE_AUTHOR("Oracle Corporation");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_FS("vboxsf");
diff --git a/fs/vboxsf/utils.c b/fs/vboxsf/utils.c
new file mode 100644
index 000000000000..9dbbc453ac7e
--- /dev/null
+++ b/fs/vboxsf/utils.c
@@ -0,0 +1,536 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VirtualBox Guest Shared Folders support: Utility functions.
+ * Mainly conversion from/to VirtualBox/Linux data structures.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/namei.h>
+#include <linux/nls.h>
+#include <linux/sizes.h>
+#include <linux/vfs.h>
+#include "vfsmod.h"
+
+/*
+ * vboxsf_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 vboxsf_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 = &vboxsf_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 = &vboxsf_dir_iops;
+ inode->i_fop = &vboxsf_dir_fops;
+ /*
+ * XXX: this probably should be set to the number of entries
+ * in the directory plus two (. ..)
+ */
+ set_nlink(inode, 1);
+ } else if (SHFL_IS_SYMLINK(attr->mode)) {
+ inode->i_mode = sf_g->fmode != ~0 ? (sf_g->fmode & 0777) : mode;
+ inode->i_mode &= ~sf_g->fmask;
+ inode->i_mode |= S_IFLNK;
+ inode->i_op = &vboxsf_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 = &vboxsf_reg_iops;
+ inode->i_fop = &vboxsf_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 vboxsf_create_at_dentry(struct dentry *dentry,
+ struct shfl_createparms *params)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(dentry->d_sb);
+ struct shfl_string *path;
+ int err;
+
+ path = vboxsf_path_from_dentry(sf_g, dentry);
+ if (IS_ERR(path))
+ return PTR_ERR(path);
+
+ err = vboxsf_create(sf_g->root, path, params);
+ __putname(path);
+
+ return err;
+}
+
+int vboxsf_stat(struct sf_glob_info *sf_g, struct shfl_string *path,
+ struct shfl_fsobjinfo *info)
+{
+ struct shfl_createparms params = {};
+ int err;
+
+ params.handle = SHFL_HANDLE_NIL;
+ params.create_flags = SHFL_CF_LOOKUP | SHFL_CF_ACT_FAIL_IF_NEW;
+
+ err = vboxsf_create(sf_g->root, path, &params);
+ if (err)
+ return err;
+
+ if (params.result != SHFL_FILE_EXISTS)
+ return -ENOENT;
+
+ if (info)
+ *info = params.info;
+
+ return 0;
+}
+
+int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(dentry->d_sb);
+ struct shfl_string *path;
+ int err;
+
+ path = vboxsf_path_from_dentry(sf_g, dentry);
+ if (IS_ERR(path))
+ return PTR_ERR(path);
+
+ err = vboxsf_stat(sf_g, path, info);
+ __putname(path);
+ return err;
+}
+
+int vboxsf_inode_revalidate(struct dentry *dentry)
+{
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(dentry->d_sb);
+ struct sf_inode_info *sf_i;
+ struct shfl_fsobjinfo info;
+ int err;
+
+ if (!dentry || !d_really_is_positive(dentry))
+ return -EINVAL;
+
+ sf_i = GET_INODE_INFO(d_inode(dentry));
+ if (!sf_i->force_restat) {
+ if (time_before(jiffies, dentry->d_time + sf_g->ttl))
+ return 0;
+ }
+
+ err = vboxsf_stat_dentry(dentry, &info);
+ if (err)
+ return err;
+
+ dentry->d_time = jiffies;
+ sf_i->force_restat = 0;
+ vboxsf_init_inode(sf_g, d_inode(dentry), &info);
+ return 0;
+}
+
+int vboxsf_getattr(const struct path *path, struct kstat *kstat,
+ u32 request_mask, unsigned int flags)
+{
+ int err;
+ struct dentry *dentry = path->dentry;
+
+ err = vboxsf_inode_revalidate(dentry);
+ if (err)
+ return err;
+
+ generic_fillattr(d_inode(dentry), kstat);
+ return 0;
+}
+
+int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct sf_inode_info *sf_i = GET_INODE_INFO(d_inode(dentry));
+ struct sf_glob_info *sf_g = GET_GLOB_INFO(dentry->d_sb);
+ struct shfl_createparms params = {};
+ struct shfl_fsobjinfo info = {};
+ uint32_t buf_len;
+ int err;
+
+ params.handle = SHFL_HANDLE_NIL;
+ params.create_flags = SHFL_CF_ACT_OPEN_IF_EXISTS |
+ SHFL_CF_ACT_FAIL_IF_NEW |
+ SHFL_CF_ACCESS_ATTR_WRITE;
+
+ /* this is at least required for Posix hosts */
+ if (iattr->ia_valid & ATTR_SIZE)
+ params.create_flags |= SHFL_CF_ACCESS_WRITE;
+
+ err = vboxsf_create_at_dentry(dentry, &params);
+ if (err || params.result != SHFL_FILE_EXISTS)
+ return err ? err : -ENOENT;
+
+#define mode_set(r) ((iattr->ia_mode & (S_##r)) ? SHFL_UNIX_##r : 0)
+
+ /*
+ * Setting the file size and setting the other attributes has to
+ * be handled separately.
+ */
+ if (iattr->ia_valid & (ATTR_MODE | ATTR_ATIME | ATTR_MTIME)) {
+ if (iattr->ia_valid & ATTR_MODE) {
+ info.attr.mode = mode_set(ISUID);
+ info.attr.mode |= mode_set(ISGID);
+ info.attr.mode |= mode_set(IRUSR);
+ info.attr.mode |= mode_set(IWUSR);
+ info.attr.mode |= mode_set(IXUSR);
+ info.attr.mode |= mode_set(IRGRP);
+ info.attr.mode |= mode_set(IWGRP);
+ info.attr.mode |= mode_set(IXGRP);
+ info.attr.mode |= mode_set(IROTH);
+ info.attr.mode |= mode_set(IWOTH);
+ info.attr.mode |= mode_set(IXOTH);
+
+ if (iattr->ia_mode & S_IFDIR)
+ info.attr.mode |= SHFL_TYPE_DIRECTORY;
+ else
+ info.attr.mode |= SHFL_TYPE_FILE;
+ }
+
+ if (iattr->ia_valid & ATTR_ATIME)
+ sf_timespec_to_vbox(&info.access_time,
+ &iattr->ia_atime);
+
+ if (iattr->ia_valid & ATTR_MTIME)
+ sf_timespec_to_vbox(&info.modification_time,
+ &iattr->ia_mtime);
+
+ /*
+ * Ignore ctime (inode change time) as it can't be set
+ * from userland anyway.
+ */
+
+ buf_len = sizeof(info);
+ err = vboxsf_fsinfo(sf_g->root, params.handle,
+ SHFL_INFO_SET | SHFL_INFO_FILE, &buf_len,
+ &info);
+ if (err) {
+ vboxsf_close(sf_g->root, params.handle);
+ return err;
+ }
+
+ /* the host may have given us different attr then requested */
+ sf_i->force_restat = 1;
+ }
+
+#undef mode_set
+
+ if (iattr->ia_valid & ATTR_SIZE) {
+ memset(&info, 0, sizeof(info));
+ info.size = iattr->ia_size;
+ buf_len = sizeof(info);
+ err = vboxsf_fsinfo(sf_g->root, params.handle,
+ SHFL_INFO_SET | SHFL_INFO_SIZE, &buf_len,
+ &info);
+ if (err) {
+ vboxsf_close(sf_g->root, params.handle);
+ return err;
+ }
+
+ /* the host may have given us different attr then requested */
+ sf_i->force_restat = 1;
+ }
+
+ vboxsf_close(sf_g->root, params.handle);
+
+ /* Update the inode with what the host has actually given us. */
+ if (sf_i->force_restat)
+ vboxsf_inode_revalidate(dentry);
+
+ return 0;
+}
+
+/*
+ * [dentry] contains string encoded in coding system that corresponds
+ * to [sf_g]->nls, we must convert it to UTF8 here.
+ * Returns a shfl_string allocated through __getname (must be freed using
+ * __putname), or an ERR_PTR on error.
+ */
+struct shfl_string *vboxsf_path_from_dentry(struct sf_glob_info *sf_g,
+ struct dentry *dentry)
+{
+ struct shfl_string *shfl_path;
+ int path_len, out_len, nb;
+ char *buf, *path;
+ wchar_t uni;
+ u8 *out;
+
+ buf = __getname();
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ path = dentry_path_raw(dentry, buf, PATH_MAX);
+ if (IS_ERR(path)) {
+ __putname(buf);
+ return (struct shfl_string *)path;
+ }
+ path_len = strlen(path);
+
+ if (sf_g->nls) {
+ shfl_path = __getname();
+ if (!shfl_path) {
+ __putname(buf);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ out = shfl_path->string.utf8;
+ out_len = PATH_MAX - SHFLSTRING_HEADER_SIZE - 1;
+
+ while (path_len) {
+ nb = sf_g->nls->char2uni(path, path_len, &uni);
+ if (nb < 0) {
+ __putname(shfl_path);
+ __putname(buf);
+ return ERR_PTR(-EINVAL);
+ }
+ path += nb;
+ path_len -= nb;
+
+ nb = utf32_to_utf8(uni, out, out_len);
+ if (nb < 0) {
+ __putname(shfl_path);
+ __putname(buf);
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+ out += nb;
+ out_len -= nb;
+ }
+ *out = 0;
+ shfl_path->length = out - shfl_path->string.utf8;
+ shfl_path->size = shfl_path->length + 1;
+ __putname(buf);
+ } else {
+ if ((SHFLSTRING_HEADER_SIZE + path_len + 1) > PATH_MAX) {
+ __putname(buf);
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+ /*
+ * dentry_path stores the name at the end of buf, but the
+ * shfl_string string we return must be properly aligned.
+ */
+ shfl_path = (struct shfl_string *)buf;
+ memmove(shfl_path->string.utf8, path, path_len);
+ shfl_path->string.utf8[path_len] = 0;
+ shfl_path->length = path_len;
+ shfl_path->size = path_len + 1;
+ }
+
+ return shfl_path;
+}
+
+int vboxsf_nlscpy(struct 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(struct list_head *list)
+{
+ 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;
+ }
+
+ b->entries = 0;
+ b->used = 0;
+ b->free = DIR_BUFFER_SIZE;
+ list_add(&b->head, list);
+
+ return b;
+}
+
+static void sf_dir_buf_free(struct sf_dir_buf *b)
+{
+ list_del(&b->head);
+ kfree(b->buf);
+ kfree(b);
+}
+
+/**
+ * Create a new directory buffer descriptor.
+ * Return: Created sf_dir_info buffer, or NULL when malloc fails
+ */
+struct sf_dir_info *vboxsf_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;
+}
+
+/**
+ * Free the directory buffer.
+ * @p sf_dir_info buffer to free
+ */
+void vboxsf_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);
+}
+
+int vboxsf_dir_read_all(struct sf_glob_info *sf_g, struct sf_dir_info *sf_d,
+ u64 handle)
+{
+ struct sf_dir_buf *b;
+ u32 entries, size;
+ int err = 0;
+ void *buf;
+
+ /* vboxsf_dirinfo returns 1 on end of dir */
+ while (err == 0) {
+ b = sf_dir_buf_alloc(&sf_d->info_list);
+ if (!b) {
+ err = -ENOMEM;
+ break;
+ }
+
+ buf = b->buf;
+ size = b->free;
+
+ err = vboxsf_dirinfo(sf_g->root, handle, NULL, 0, 0,
+ &size, buf, &entries);
+ if (err < 0)
+ break;
+
+ b->entries += entries;
+ b->free -= size;
+ b->used += size;
+ }
+
+ if (b && b->used == 0)
+ sf_dir_buf_free(b);
+
+ /* -EILSEQ means the host could not translate a filename, ignore */
+ if (err > 0 || err == -EILSEQ)
+ err = 0;
+
+ return err;
+}
diff --git a/fs/vboxsf/vboxsf_wrappers.c b/fs/vboxsf/vboxsf_wrappers.c
new file mode 100644
index 000000000000..a5ddcae38799
--- /dev/null
+++ b/fs/vboxsf/vboxsf_wrappers.c
@@ -0,0 +1,370 @@
+// SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0)
+/*
+ * Wrapper functions for the shfl host calls.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vbox_err.h>
+#include <linux/vbox_utils.h>
+#include "vfsmod.h"
+
+static u32 vboxsf_client_id;
+
+int vboxsf_connect(void)
+{
+ struct vbg_dev *gdev;
+ struct vmmdev_hgcm_service_location loc;
+ int err, vbox_status;
+
+ loc.type = VMMDEV_HGCM_LOC_LOCALHOST_EXISTING;
+ strcpy(loc.u.localhost.service_name, "VBoxSharedFolders");
+
+ gdev = vbg_get_gdev();
+ if (IS_ERR(gdev))
+ return VERR_NOT_SUPPORTED; /* No guest-device */
+
+ err = vbg_hgcm_connect(gdev, &loc, &vboxsf_client_id, &vbox_status);
+ vbg_put_gdev(gdev);
+
+ return err ? err : vbg_status_code_to_errno(vbox_status);
+}
+
+void vboxsf_disconnect(void)
+{
+ struct vbg_dev *gdev;
+ int vbox_status;
+
+ gdev = vbg_get_gdev();
+ if (IS_ERR(gdev))
+ return; /* guest-device is gone, already disconnected */
+
+ vbg_hgcm_disconnect(gdev, vboxsf_client_id, &vbox_status);
+ vbg_put_gdev(gdev);
+}
+
+static int vboxsf_call(u32 function, void *parms, u32 parm_count, int *status)
+{
+ struct vbg_dev *gdev;
+ int err, vbox_status;
+
+ gdev = vbg_get_gdev();
+ if (IS_ERR(gdev))
+ return VERR_DEV_IO_ERROR; /* guest-dev removed underneath us */
+
+ err = vbg_hgcm_call(gdev, vboxsf_client_id, function, U32_MAX,
+ parms, parm_count, &vbox_status);
+ vbg_put_gdev(gdev);
+
+ if (err < 0)
+ return err;
+
+ if (status)
+ *status = vbox_status;
+
+ return vbg_status_code_to_errno(vbox_status);
+}
+
+int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root)
+{
+ struct shfl_map_folder parms;
+ int err, status;
+
+ parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
+ parms.path.u.pointer.size = shfl_string_buf_size(folder_name);
+ parms.path.u.pointer.u.linear_addr = (uintptr_t)folder_name;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = 0;
+
+ parms.delimiter.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.delimiter.u.value32 = '/';
+
+ parms.case_sensitive.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.case_sensitive.u.value32 = 1;
+
+ err = vboxsf_call(SHFL_FN_MAP_FOLDER, &parms, SHFL_CPARMS_MAP_FOLDER,
+ &status);
+ if (err == -ENOSYS && status == VERR_NOT_IMPLEMENTED)
+ vbg_err("%s: Error host is too old\n", __func__);
+
+ *root = parms.root.u.value32;
+ return err;
+}
+
+int vboxsf_unmap_folder(u32 root)
+{
+ struct shfl_unmap_folder parms;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ return vboxsf_call(SHFL_FN_UNMAP_FOLDER, &parms,
+ SHFL_CPARMS_UNMAP_FOLDER, NULL);
+}
+
+/**
+ * Create a new file or folder or open an existing one in a shared folder.
+ * Note this function always returns 0 / success unless an exceptional condition
+ * occurs - out of memory, invalid arguments, etc. If the file or folder could
+ * not be opened or created, create_parms->handle will be set to
+ * SHFL_HANDLE_NIL on return. In this case the value in create_parms->result
+ * provides information as to why (e.g. SHFL_FILE_EXISTS), create_parms->result
+ * is also set on success as additional information.
+ * Return: 0 or negative errno value.
+ * @root Root of the shared folder in which to create the file
+ * @parsed_path The path of the file or folder relative to the shared folder
+ * @param create_parms Parameters for file/folder creation.
+ */
+int vboxsf_create(u32 root, struct shfl_string *parsed_path,
+ struct shfl_createparms *create_parms)
+{
+ struct shfl_create parms;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
+ parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
+ parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
+
+ parms.parms.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
+ parms.parms.u.pointer.size = sizeof(struct shfl_createparms);
+ parms.parms.u.pointer.u.linear_addr = (uintptr_t)create_parms;
+
+ return vboxsf_call(SHFL_FN_CREATE, &parms, SHFL_CPARMS_CREATE, NULL);
+}
+
+int vboxsf_close(u32 root, u64 handle)
+{
+ struct shfl_close parms;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+ parms.handle.u.value64 = handle;
+
+ return vboxsf_call(SHFL_FN_CLOSE, &parms, SHFL_CPARMS_CLOSE, NULL);
+}
+
+int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags)
+{
+ struct shfl_remove parms;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+ parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
+ parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
+
+ parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.flags.u.value32 = flags;
+
+ return vboxsf_call(SHFL_FN_REMOVE, &parms, SHFL_CPARMS_REMOVE, NULL);
+}
+
+int vboxsf_rename(u32 root, struct shfl_string *src_path,
+ struct shfl_string *dest_path, u32 flags)
+{
+ struct shfl_rename parms;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.src.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+ parms.src.u.pointer.size = shfl_string_buf_size(src_path);
+ parms.src.u.pointer.u.linear_addr = (uintptr_t)src_path;
+
+ parms.dest.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+ parms.dest.u.pointer.size = shfl_string_buf_size(dest_path);
+ parms.dest.u.pointer.u.linear_addr = (uintptr_t)dest_path;
+
+ parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.flags.u.value32 = flags;
+
+ return vboxsf_call(SHFL_FN_RENAME, &parms, SHFL_CPARMS_RENAME, NULL);
+}
+
+int vboxsf_read(u32 root, u64 handle, u64 offset,
+ u32 *buf_len, u8 *buf, bool user)
+{
+ struct shfl_read parms;
+ int err;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+ parms.handle.u.value64 = handle;
+ parms.offset.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+ parms.offset.u.value64 = offset;
+ parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.cb.u.value32 = *buf_len;
+ if (user)
+ parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT;
+ else
+ parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
+ parms.buffer.u.pointer.size = *buf_len;
+ parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+ err = vboxsf_call(SHFL_FN_READ, &parms, SHFL_CPARMS_READ, NULL);
+
+ *buf_len = parms.cb.u.value32;
+ return err;
+}
+
+int vboxsf_write(u32 root, u64 handle, u64 offset,
+ u32 *buf_len, const u8 *buf, bool user)
+{
+ struct shfl_write parms;
+ int err;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+ parms.handle.u.value64 = handle;
+ parms.offset.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+ parms.offset.u.value64 = offset;
+ parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.cb.u.value32 = *buf_len;
+ if (user)
+ parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_IN;
+ else
+ parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+ parms.buffer.u.pointer.size = *buf_len;
+ parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+ err = vboxsf_call(SHFL_FN_WRITE, &parms, SHFL_CPARMS_WRITE, NULL);
+
+ *buf_len = parms.cb.u.value32;
+ return err;
+}
+
+/* Returns 0 on success, 1 on end-of-dir, negative errno otherwise */
+int vboxsf_dirinfo(u32 root, u64 handle,
+ struct shfl_string *parsed_path, u32 flags, u32 index,
+ u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count)
+{
+ struct shfl_list parms;
+ int err, status;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+ parms.handle.u.value64 = handle;
+ parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.flags.u.value32 = flags;
+ parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.cb.u.value32 = *buf_len;
+ if (parsed_path) {
+ parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+ parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
+ parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
+ } else {
+ parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_IN;
+ parms.path.u.pointer.size = 0;
+ parms.path.u.pointer.u.linear_addr = 0;
+ }
+
+ parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
+ parms.buffer.u.pointer.size = *buf_len;
+ parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+ parms.resume_point.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.resume_point.u.value32 = index;
+ parms.file_count.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.file_count.u.value32 = 0; /* out parameter only */
+
+ err = vboxsf_call(SHFL_FN_LIST, &parms, SHFL_CPARMS_LIST, &status);
+ if (err == -ENODATA && status == VERR_NO_MORE_FILES)
+ err = 1;
+
+ *buf_len = parms.cb.u.value32;
+ *file_count = parms.file_count.u.value32;
+ return err;
+}
+
+int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
+ u32 *buf_len, void *buf)
+{
+ struct shfl_information parms;
+ int err;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
+ parms.handle.u.value64 = handle;
+ parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.flags.u.value32 = flags;
+ parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.cb.u.value32 = *buf_len;
+ parms.info.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
+ parms.info.u.pointer.size = *buf_len;
+ parms.info.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+ err = vboxsf_call(SHFL_FN_INFORMATION, &parms, SHFL_CPARMS_INFORMATION,
+ NULL);
+
+ *buf_len = parms.cb.u.value32;
+ return err;
+}
+
+int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
+ u32 buf_len, u8 *buf)
+{
+ struct shfl_readLink parms;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+ parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
+ parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
+
+ parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
+ parms.buffer.u.pointer.size = buf_len;
+ parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+ return vboxsf_call(SHFL_FN_READLINK, &parms, SHFL_CPARMS_READLINK,
+ NULL);
+}
+
+int vboxsf_symlink(u32 root, struct shfl_string *new_path,
+ struct shfl_string *old_path, struct shfl_fsobjinfo *buf)
+{
+ struct shfl_symlink parms;
+
+ parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
+ parms.root.u.value32 = root;
+
+ parms.new_path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+ parms.new_path.u.pointer.size = shfl_string_buf_size(new_path);
+ parms.new_path.u.pointer.u.linear_addr = (uintptr_t)new_path;
+
+ parms.old_path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
+ parms.old_path.u.pointer.size = shfl_string_buf_size(old_path);
+ parms.old_path.u.pointer.u.linear_addr = (uintptr_t)old_path;
+
+ parms.info.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
+ parms.info.u.pointer.size = sizeof(struct shfl_fsobjinfo);
+ parms.info.u.pointer.u.linear_addr = (uintptr_t)buf;
+
+ return vboxsf_call(SHFL_FN_SYMLINK, &parms, SHFL_CPARMS_SYMLINK, NULL);
+}
+
+int vboxsf_set_utf8(void)
+{
+ return vboxsf_call(SHFL_FN_SET_UTF8, NULL, 0, NULL);
+}
+
+int vboxsf_set_symlinks(void)
+{
+ return vboxsf_call(SHFL_FN_SET_SYMLINKS, NULL, 0, NULL);
+}
diff --git a/fs/vboxsf/vfsmod.h b/fs/vboxsf/vfsmod.h
new file mode 100644
index 000000000000..20efcb77232d
--- /dev/null
+++ b/fs/vboxsf/vfsmod.h
@@ -0,0 +1,133 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * VirtualBox Guest Shared Folders support: module header.
+ *
+ * Copyright (C) 2006-2016 Oracle Corporation
+ */
+
+#ifndef VFSMOD_H
+#define VFSMOD_H
+
+#include <linux/backing-dev.h>
+#include <linux/version.h>
+#include "shfl_hostintf.h"
+
+#define DIR_BUFFER_SIZE SZ_16K
+
+/* The cast is to prevent assignment of void * to pointers of arbitrary type */
+#define GET_GLOB_INFO(sb) ((struct sf_glob_info *)(sb)->s_fs_info)
+#define SET_GLOB_INFO(sb, sf_g) ((sb)->s_fs_info = (sf_g))
+#define GET_INODE_INFO(i) container_of(i, struct sf_inode_info, vfs_inode)
+
+/* per-shared folder information */
+struct sf_glob_info {
+ struct shfl_fsobjinfo root_info;
+ struct nls_table *nls;
+ u32 root;
+ /* mount options */
+ struct shfl_string *name;
+ char *nls_name;
+ int ttl;
+ int uid;
+ int gid;
+ int dmode;
+ int fmode;
+ int dmask;
+ int fmask;
+};
+
+/* per-inode information */
+struct sf_inode_info {
+ /* some information was changed, update data on next revalidate */
+ int force_restat;
+ /* file structure, only valid between open() and release() */
+ struct file *file;
+ /*
+ * handle valid if a file was created with sf_create_aux until it
+ * will be opened with sf_reg_open()
+ */
+ u64 handle;
+ /* The VFS inode struct */
+ struct inode vfs_inode;
+};
+
+struct sf_dir_info {
+ struct list_head info_list;
+};
+
+struct sf_dir_buf {
+ size_t entries;
+ size_t free;
+ size_t used;
+ void *buf;
+ struct list_head head;
+};
+
+struct sf_reg_info {
+ u64 handle;
+};
+
+/* globals */
+extern const struct inode_operations vboxsf_dir_iops;
+extern const struct inode_operations vboxsf_lnk_iops;
+extern const struct inode_operations vboxsf_reg_iops;
+extern const struct file_operations vboxsf_dir_fops;
+extern const struct file_operations vboxsf_reg_fops;
+extern const struct address_space_operations vboxsf_reg_aops;
+
+/* from utils.c */
+void vboxsf_init_inode(struct sf_glob_info *sf_g, struct inode *inode,
+ const struct shfl_fsobjinfo *info);
+int vboxsf_create_at_dentry(struct dentry *dentry,
+ struct shfl_createparms *params);
+int vboxsf_stat(struct sf_glob_info *sf_g, struct shfl_string *path,
+ struct shfl_fsobjinfo *info);
+int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info);
+int vboxsf_inode_revalidate(struct dentry *dentry);
+int vboxsf_getattr(const struct path *path, struct kstat *kstat,
+ u32 request_mask, unsigned int query_flags);
+int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr);
+struct shfl_string *vboxsf_path_from_dentry(struct sf_glob_info *sf_g,
+ struct dentry *dentry);
+int vboxsf_nlscpy(struct sf_glob_info *sf_g, char *name, size_t name_bound_len,
+ const unsigned char *utf8_name, size_t utf8_len);
+struct sf_dir_info *vboxsf_dir_info_alloc(void);
+void vboxsf_dir_info_free(struct sf_dir_info *p);
+int vboxsf_dir_read_all(struct sf_glob_info *sf_g, struct sf_dir_info *sf_d,
+ u64 handle);
+
+/* from vboxsf_wrappers.c */
+int vboxsf_connect(void);
+void vboxsf_disconnect(void);
+
+int vboxsf_create(u32 root, struct shfl_string *parsed_path,
+ struct shfl_createparms *create_parms);
+
+int vboxsf_close(u32 root, u64 handle);
+int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags);
+int vboxsf_rename(u32 root, struct shfl_string *src_path,
+ struct shfl_string *dest_path, u32 flags);
+
+int vboxsf_read(u32 root, u64 handle, u64 offset,
+ u32 *buf_len, u8 *buf, bool user);
+int vboxsf_write(u32 root, u64 handle, u64 offset,
+ u32 *buf_len, const u8 *buf, bool user);
+
+int vboxsf_dirinfo(u32 root, u64 handle,
+ struct shfl_string *parsed_path, u32 flags, u32 index,
+ u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count);
+int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
+ u32 *buf_len, void *buf);
+
+int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root);
+int vboxsf_unmap_folder(u32 root);
+
+int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
+ u32 buf_len, u8 *buf);
+int vboxsf_symlink(u32 root, struct shfl_string *new_path,
+ struct shfl_string *old_path, struct shfl_fsobjinfo *buf);
+
+int vboxsf_set_utf8(void);
+int vboxsf_set_symlinks(void);
+
+#endif
--
2.14.3

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