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linux-next/fs/vboxsf/vboxsf_wrappers.c
Hans de Goede 0fd1695766 fs: Add VirtualBox guest shared folder (vboxsf) support 
VirtualBox hosts can share folders with guests, this commit adds a
VFS driver implementing the Linux-guest side of this, allowing folders
exported by the host to be mounted under Linux.

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

Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2020-02-08 17:34:58 -05:00

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// SPDX-License-Identifier: MIT
/*
* Wrapper functions for the shfl host calls.
*
* Copyright (C) 2006-2018 Oracle Corporation
*/
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vbox_err.h>
#include <linux/vbox_utils.h>
#include "vfsmod.h"
#define SHFL_REQUEST \
(VMMDEV_REQUESTOR_KERNEL | VMMDEV_REQUESTOR_USR_DRV_OTHER | \
VMMDEV_REQUESTOR_CON_DONT_KNOW | VMMDEV_REQUESTOR_TRUST_NOT_GIVEN)
static u32 vboxsf_client_id;
int vboxsf_connect(void)
{
struct vbg_dev *gdev;
struct vmmdev_hgcm_service_location loc;
int err, vbox_status;
loc.type = VMMDEV_HGCM_LOC_LOCALHOST_EXISTING;
strcpy(loc.u.localhost.service_name, "VBoxSharedFolders");
gdev = vbg_get_gdev();
if (IS_ERR(gdev))
return -ENODEV; /* No guest-device */
err = vbg_hgcm_connect(gdev, SHFL_REQUEST, &loc,
&vboxsf_client_id, &vbox_status);
vbg_put_gdev(gdev);
return err ? err : vbg_status_code_to_errno(vbox_status);
}
void vboxsf_disconnect(void)
{
struct vbg_dev *gdev;
int vbox_status;
gdev = vbg_get_gdev();
if (IS_ERR(gdev))
return; /* guest-device is gone, already disconnected */
vbg_hgcm_disconnect(gdev, SHFL_REQUEST, vboxsf_client_id, &vbox_status);
vbg_put_gdev(gdev);
}
static int vboxsf_call(u32 function, void *parms, u32 parm_count, int *status)
{
struct vbg_dev *gdev;
int err, vbox_status;
gdev = vbg_get_gdev();
if (IS_ERR(gdev))
return -ESHUTDOWN; /* guest-dev removed underneath us */
err = vbg_hgcm_call(gdev, SHFL_REQUEST, vboxsf_client_id, function,
U32_MAX, parms, parm_count, &vbox_status);
vbg_put_gdev(gdev);
if (err < 0)
return err;
if (status)
*status = vbox_status;
return vbg_status_code_to_errno(vbox_status);
}
int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root)
{
struct shfl_map_folder parms;
int err, status;
parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
parms.path.u.pointer.size = shfl_string_buf_size(folder_name);
parms.path.u.pointer.u.linear_addr = (uintptr_t)folder_name;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = 0;
parms.delimiter.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.delimiter.u.value32 = '/';
parms.case_sensitive.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.case_sensitive.u.value32 = 1;
err = vboxsf_call(SHFL_FN_MAP_FOLDER, &parms, SHFL_CPARMS_MAP_FOLDER,
&status);
if (err == -ENOSYS && status == VERR_NOT_IMPLEMENTED)
vbg_err("%s: Error host is too old\n", __func__);
*root = parms.root.u.value32;
return err;
}
int vboxsf_unmap_folder(u32 root)
{
struct shfl_unmap_folder parms;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
return vboxsf_call(SHFL_FN_UNMAP_FOLDER, &parms,
SHFL_CPARMS_UNMAP_FOLDER, NULL);
}
/**
* vboxsf_create - Create a new file or folder
* @root: Root of the shared folder in which to create the file
* @parsed_path: The path of the file or folder relative to the shared folder
* @param: create_parms Parameters for file/folder creation.
*
* Create a new file or folder or open an existing one in a shared folder.
* Note this function always returns 0 / success unless an exceptional condition
* occurs - out of memory, invalid arguments, etc. If the file or folder could
* not be opened or created, create_parms->handle will be set to
* SHFL_HANDLE_NIL on return. In this case the value in create_parms->result
* provides information as to why (e.g. SHFL_FILE_EXISTS), create_parms->result
* is also set on success as additional information.
*
* Returns:
* 0 or negative errno value.
*/
int vboxsf_create(u32 root, struct shfl_string *parsed_path,
struct shfl_createparms *create_parms)
{
struct shfl_create parms;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
parms.parms.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
parms.parms.u.pointer.size = sizeof(struct shfl_createparms);
parms.parms.u.pointer.u.linear_addr = (uintptr_t)create_parms;
return vboxsf_call(SHFL_FN_CREATE, &parms, SHFL_CPARMS_CREATE, NULL);
}
int vboxsf_close(u32 root, u64 handle)
{
struct shfl_close parms;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
parms.handle.u.value64 = handle;
return vboxsf_call(SHFL_FN_CLOSE, &parms, SHFL_CPARMS_CLOSE, NULL);
}
int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags)
{
struct shfl_remove parms;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.flags.u.value32 = flags;
return vboxsf_call(SHFL_FN_REMOVE, &parms, SHFL_CPARMS_REMOVE, NULL);
}
int vboxsf_rename(u32 root, struct shfl_string *src_path,
struct shfl_string *dest_path, u32 flags)
{
struct shfl_rename parms;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.src.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
parms.src.u.pointer.size = shfl_string_buf_size(src_path);
parms.src.u.pointer.u.linear_addr = (uintptr_t)src_path;
parms.dest.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
parms.dest.u.pointer.size = shfl_string_buf_size(dest_path);
parms.dest.u.pointer.u.linear_addr = (uintptr_t)dest_path;
parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.flags.u.value32 = flags;
return vboxsf_call(SHFL_FN_RENAME, &parms, SHFL_CPARMS_RENAME, NULL);
}
int vboxsf_read(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf)
{
struct shfl_read parms;
int err;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
parms.handle.u.value64 = handle;
parms.offset.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
parms.offset.u.value64 = offset;
parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.cb.u.value32 = *buf_len;
parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
parms.buffer.u.pointer.size = *buf_len;
parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
err = vboxsf_call(SHFL_FN_READ, &parms, SHFL_CPARMS_READ, NULL);
*buf_len = parms.cb.u.value32;
return err;
}
int vboxsf_write(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf)
{
struct shfl_write parms;
int err;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
parms.handle.u.value64 = handle;
parms.offset.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
parms.offset.u.value64 = offset;
parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.cb.u.value32 = *buf_len;
parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
parms.buffer.u.pointer.size = *buf_len;
parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
err = vboxsf_call(SHFL_FN_WRITE, &parms, SHFL_CPARMS_WRITE, NULL);
*buf_len = parms.cb.u.value32;
return err;
}
/* Returns 0 on success, 1 on end-of-dir, negative errno otherwise */
int vboxsf_dirinfo(u32 root, u64 handle,
struct shfl_string *parsed_path, u32 flags, u32 index,
u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count)
{
struct shfl_list parms;
int err, status;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
parms.handle.u.value64 = handle;
parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.flags.u.value32 = flags;
parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.cb.u.value32 = *buf_len;
if (parsed_path) {
parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
} else {
parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_IN;
parms.path.u.pointer.size = 0;
parms.path.u.pointer.u.linear_addr = 0;
}
parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
parms.buffer.u.pointer.size = *buf_len;
parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
parms.resume_point.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.resume_point.u.value32 = index;
parms.file_count.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.file_count.u.value32 = 0; /* out parameter only */
err = vboxsf_call(SHFL_FN_LIST, &parms, SHFL_CPARMS_LIST, &status);
if (err == -ENODATA && status == VERR_NO_MORE_FILES)
err = 1;
*buf_len = parms.cb.u.value32;
*file_count = parms.file_count.u.value32;
return err;
}
int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
u32 *buf_len, void *buf)
{
struct shfl_information parms;
int err;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.handle.type = VMMDEV_HGCM_PARM_TYPE_64BIT;
parms.handle.u.value64 = handle;
parms.flags.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.flags.u.value32 = flags;
parms.cb.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.cb.u.value32 = *buf_len;
parms.info.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL;
parms.info.u.pointer.size = *buf_len;
parms.info.u.pointer.u.linear_addr = (uintptr_t)buf;
err = vboxsf_call(SHFL_FN_INFORMATION, &parms, SHFL_CPARMS_INFORMATION,
NULL);
*buf_len = parms.cb.u.value32;
return err;
}
int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
u32 buf_len, u8 *buf)
{
struct shfl_readLink parms;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
parms.path.u.pointer.size = shfl_string_buf_size(parsed_path);
parms.path.u.pointer.u.linear_addr = (uintptr_t)parsed_path;
parms.buffer.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
parms.buffer.u.pointer.size = buf_len;
parms.buffer.u.pointer.u.linear_addr = (uintptr_t)buf;
return vboxsf_call(SHFL_FN_READLINK, &parms, SHFL_CPARMS_READLINK,
NULL);
}
int vboxsf_symlink(u32 root, struct shfl_string *new_path,
struct shfl_string *old_path, struct shfl_fsobjinfo *buf)
{
struct shfl_symlink parms;
parms.root.type = VMMDEV_HGCM_PARM_TYPE_32BIT;
parms.root.u.value32 = root;
parms.new_path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
parms.new_path.u.pointer.size = shfl_string_buf_size(new_path);
parms.new_path.u.pointer.u.linear_addr = (uintptr_t)new_path;
parms.old_path.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_IN;
parms.old_path.u.pointer.size = shfl_string_buf_size(old_path);
parms.old_path.u.pointer.u.linear_addr = (uintptr_t)old_path;
parms.info.type = VMMDEV_HGCM_PARM_TYPE_LINADDR_KERNEL_OUT;
parms.info.u.pointer.size = sizeof(struct shfl_fsobjinfo);
parms.info.u.pointer.u.linear_addr = (uintptr_t)buf;
return vboxsf_call(SHFL_FN_SYMLINK, &parms, SHFL_CPARMS_SYMLINK, NULL);
}
int vboxsf_set_utf8(void)
{
return vboxsf_call(SHFL_FN_SET_UTF8, NULL, 0, NULL);
}
int vboxsf_set_symlinks(void)
{
return vboxsf_call(SHFL_FN_SET_SYMLINKS, NULL, 0, NULL);
}
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