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fs: Add VirtualBox guest shared folder (vboxsf) support

Browse Source 
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>
This commit is contained in:
Hans de Goede
2019-12-12 15:09:14 +01:00
committed by Al Viro
parent f35aa2bc80
commit 0fd1695766
12 changed files with 3280 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
MAINTAINERS
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@@ -17610,6 +17610,12 @@ F: include/linux/vbox_utils.h
F: include/uapi/linux/vbox*.h
F: drivers/virt/vboxguest/
VIRTUAL BOX SHARED FOLDER VFS DRIVER:
M: Hans de Goede <hdegoede@redhat.com>
L: linux-fsdevel@vger.kernel.org
S: Maintained
F: fs/vboxsf/*
VIRTUAL SERIO DEVICE DRIVER
M: Stephen Chandler Paul <thatslyude@gmail.com>
S: Maintained

1
fs/Kconfig
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@@ -264,6 +264,7 @@ source "fs/pstore/Kconfig"
source "fs/sysv/Kconfig"
source "fs/ufs/Kconfig"
source "fs/erofs/Kconfig"
source "fs/vboxsf/Kconfig"
endif # MISC_FILESYSTEMS

1
fs/Makefile
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@@ -133,3 +133,4 @@ obj-$(CONFIG_CEPH_FS) += ceph/
obj-$(CONFIG_PSTORE) += pstore/
obj-$(CONFIG_EFIVAR_FS) += efivarfs/
obj-$(CONFIG_EROFS_FS) += erofs/
obj-$(CONFIG_VBOXSF_FS) += vboxsf/

10
fs/vboxsf/Kconfig Normal file
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@@ -0,0 +1,10 @@
config VBOXSF_FS
tristate "VirtualBox guest shared folder (vboxsf) support"
depends on X86 && VBOXGUEST
select NLS
help
VirtualBox hosts can share folders with guests, this driver
implements the Linux-guest side of this allowing folders exported
by the host to be mounted under Linux.
If you want to use shared folders in VirtualBox guests, answer Y or M.

5
fs/vboxsf/Makefile Normal file
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@@ -0,0 +1,5 @@
# SPDX-License-Identifier: MIT
obj-$(CONFIG_VBOXSF_FS) += vboxsf.o
vboxsf-y := dir.o file.o utils.o vboxsf_wrappers.o super.o

427
fs/vboxsf/dir.c Normal file
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@@ -0,0 +1,427 @@
// SPDX-License-Identifier: MIT
/*
* VirtualBox Guest Shared Folders support: Directory inode and file operations
*
* Copyright (C) 2006-2018 Oracle Corporation
*/
#include <linux/namei.h>
#include <linux/vbox_utils.h>
#include "vfsmod.h"
static int vboxsf_dir_open(struct inode *inode, struct file *file)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
struct shfl_createparms params = {};
struct vboxsf_dir_info *sf_d;
int err;
sf_d = vboxsf_dir_info_alloc();
if (!sf_d)
return -ENOMEM;
params.handle = SHFL_HANDLE_NIL;
params.create_flags = SHFL_CF_DIRECTORY | SHFL_CF_ACT_OPEN_IF_EXISTS |
SHFL_CF_ACT_FAIL_IF_NEW | SHFL_CF_ACCESS_READ;
err = vboxsf_create_at_dentry(file_dentry(file), &params);
if (err)
goto err_free_dir_info;
if (params.result != SHFL_FILE_EXISTS) {
err = -ENOENT;
goto err_close;
}
err = vboxsf_dir_read_all(sbi, sf_d, params.handle);
if (err)
goto err_close;
vboxsf_close(sbi->root, params.handle);
file->private_data = sf_d;
return 0;
err_close:
vboxsf_close(sbi->root, params.handle);
err_free_dir_info:
vboxsf_dir_info_free(sf_d);
return err;
}
static int vboxsf_dir_release(struct inode *inode, struct file *file)
{
if (file->private_data)
vboxsf_dir_info_free(file->private_data);
return 0;
}
static unsigned int vboxsf_get_d_type(u32 mode)
{
unsigned int d_type;
switch (mode & SHFL_TYPE_MASK) {
case SHFL_TYPE_FIFO:
d_type = DT_FIFO;
break;
case SHFL_TYPE_DEV_CHAR:
d_type = DT_CHR;
break;
case SHFL_TYPE_DIRECTORY:
d_type = DT_DIR;
break;
case SHFL_TYPE_DEV_BLOCK:
d_type = DT_BLK;
break;
case SHFL_TYPE_FILE:
d_type = DT_REG;
break;
case SHFL_TYPE_SYMLINK:
d_type = DT_LNK;
break;
case SHFL_TYPE_SOCKET:
d_type = DT_SOCK;
break;
case SHFL_TYPE_WHITEOUT:
d_type = DT_WHT;
break;
default:
d_type = DT_UNKNOWN;
break;
}
return d_type;
}
static bool vboxsf_dir_emit(struct file *dir, struct dir_context *ctx)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(file_inode(dir)->i_sb);
struct vboxsf_dir_info *sf_d = dir->private_data;
struct shfl_dirinfo *info;
struct vboxsf_dir_buf *b;
unsigned int d_type;
loff_t i, cur = 0;
ino_t fake_ino;
void *end;
int err;
list_for_each_entry(b, &sf_d->info_list, head) {
try_next_entry:
if (ctx->pos >= cur + b->entries) {
cur += b->entries;
continue;
}
/*
* Note the vboxsf_dir_info objects we are iterating over here
* are variable sized, so the info pointer may end up being
* unaligned. This is how we get the data from the host.
* Since vboxsf is only supported on x86 machines this is not
* a problem.
*/
for (i = 0, info = b->buf; i < ctx->pos - cur; i++) {
end = &info->name.string.utf8[info->name.size];
/* Only happens if the host gives us corrupt data */
if (WARN_ON(end > (b->buf + b->used)))
return false;
info = end;
}
end = &info->name.string.utf8[info->name.size];
if (WARN_ON(end > (b->buf + b->used)))
return false;
/* Info now points to the right entry, emit it. */
d_type = vboxsf_get_d_type(info->info.attr.mode);
/*
* On 32 bit systems pos is 64 signed, while ino is 32 bit
* unsigned so fake_ino may overflow, check for this.
*/
if ((ino_t)(ctx->pos + 1) != (u64)(ctx->pos + 1)) {
vbg_err("vboxsf: fake ino overflow, truncating dir\n");
return false;
}
fake_ino = ctx->pos + 1;
if (sbi->nls) {
char d_name[NAME_MAX];
err = vboxsf_nlscpy(sbi, d_name, NAME_MAX,
info->name.string.utf8,
info->name.length);
if (err) {
/* skip erroneous entry and proceed */
ctx->pos += 1;
goto try_next_entry;
}
return dir_emit(ctx, d_name, strlen(d_name),
fake_ino, d_type);
}
return dir_emit(ctx, info->name.string.utf8, info->name.length,
fake_ino, d_type);
}
return false;
}
static int vboxsf_dir_iterate(struct file *dir, struct dir_context *ctx)
{
bool emitted;
do {
emitted = vboxsf_dir_emit(dir, ctx);
if (emitted)
ctx->pos += 1;
} while (emitted);
return 0;
}
const struct file_operations vboxsf_dir_fops = {
.open = vboxsf_dir_open,
.iterate = vboxsf_dir_iterate,
.release = vboxsf_dir_release,
.read = generic_read_dir,
.llseek = generic_file_llseek,
};
/*
* This is called during name resolution/lookup to check if the @dentry in
* the cache is still valid. the job is handled by vboxsf_inode_revalidate.
*/
static int vboxsf_dentry_revalidate(struct dentry *dentry, unsigned int flags)
{
if (flags & LOOKUP_RCU)
return -ECHILD;
if (d_really_is_positive(dentry))
return vboxsf_inode_revalidate(dentry) == 0;
else
return vboxsf_stat_dentry(dentry, NULL) == -ENOENT;
}
const struct dentry_operations vboxsf_dentry_ops = {
.d_revalidate = vboxsf_dentry_revalidate
};
/* iops */
static struct dentry *vboxsf_dir_lookup(struct inode *parent,
struct dentry *dentry,
unsigned int flags)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
struct shfl_fsobjinfo fsinfo;
struct inode *inode;
int err;
dentry->d_time = jiffies;
err = vboxsf_stat_dentry(dentry, &fsinfo);
if (err) {
inode = (err == -ENOENT) ? NULL : ERR_PTR(err);
} else {
inode = vboxsf_new_inode(parent->i_sb);
if (!IS_ERR(inode))
vboxsf_init_inode(sbi, inode, &fsinfo);
}
return d_splice_alias(inode, dentry);
}
static int vboxsf_dir_instantiate(struct inode *parent, struct dentry *dentry,
struct shfl_fsobjinfo *info)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
struct vboxsf_inode *sf_i;
struct inode *inode;
inode = vboxsf_new_inode(parent->i_sb);
if (IS_ERR(inode))
return PTR_ERR(inode);
sf_i = VBOXSF_I(inode);
/* The host may have given us different attr then requested */
sf_i->force_restat = 1;
vboxsf_init_inode(sbi, inode, info);
d_instantiate(dentry, inode);
return 0;
}
static int vboxsf_dir_create(struct inode *parent, struct dentry *dentry,
umode_t mode, int is_dir)
{
struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
struct shfl_createparms params = {};
int err;
params.handle = SHFL_HANDLE_NIL;
params.create_flags = SHFL_CF_ACT_CREATE_IF_NEW |
SHFL_CF_ACT_FAIL_IF_EXISTS |
SHFL_CF_ACCESS_READWRITE |
(is_dir ? SHFL_CF_DIRECTORY : 0);
params.info.attr.mode = (mode & 0777) |
(is_dir ? SHFL_TYPE_DIRECTORY : SHFL_TYPE_FILE);
params.info.attr.additional = SHFLFSOBJATTRADD_NOTHING;
err = vboxsf_create_at_dentry(dentry, &params);
if (err)
return err;
if (params.result != SHFL_FILE_CREATED)
return -EPERM;
vboxsf_close(sbi->root, params.handle);
err = vboxsf_dir_instantiate(parent, dentry, &params.info);
if (err)
return err;
/* parent directory access/change time changed */
sf_parent_i->force_restat = 1;
return 0;
}
static int vboxsf_dir_mkfile(struct inode *parent, struct dentry *dentry,
umode_t mode, bool excl)
{
return vboxsf_dir_create(parent, dentry, mode, 0);
}
static int vboxsf_dir_mkdir(struct inode *parent, struct dentry *dentry,
umode_t mode)
{
return vboxsf_dir_create(parent, dentry, mode, 1);
}
static int vboxsf_dir_unlink(struct inode *parent, struct dentry *dentry)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
struct inode *inode = d_inode(dentry);
struct shfl_string *path;
u32 flags;
int err;
if (S_ISDIR(inode->i_mode))
flags = SHFL_REMOVE_DIR;
else
flags = SHFL_REMOVE_FILE;
if (S_ISLNK(inode->i_mode))
flags |= SHFL_REMOVE_SYMLINK;
path = vboxsf_path_from_dentry(sbi, dentry);
if (IS_ERR(path))
return PTR_ERR(path);
err = vboxsf_remove(sbi->root, path, flags);
__putname(path);
if (err)
return err;
/* parent directory access/change time changed */
sf_parent_i->force_restat = 1;
return 0;
}
static int vboxsf_dir_rename(struct inode *old_parent,
struct dentry *old_dentry,
struct inode *new_parent,
struct dentry *new_dentry,
unsigned int flags)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(old_parent->i_sb);
struct vboxsf_inode *sf_old_parent_i = VBOXSF_I(old_parent);
struct vboxsf_inode *sf_new_parent_i = VBOXSF_I(new_parent);
u32 shfl_flags = SHFL_RENAME_FILE | SHFL_RENAME_REPLACE_IF_EXISTS;
struct shfl_string *old_path, *new_path;
int err;
if (flags)
return -EINVAL;
old_path = vboxsf_path_from_dentry(sbi, old_dentry);
if (IS_ERR(old_path))
return PTR_ERR(old_path);
new_path = vboxsf_path_from_dentry(sbi, new_dentry);
if (IS_ERR(new_path)) {
err = PTR_ERR(new_path);
goto err_put_old_path;
}
if (d_inode(old_dentry)->i_mode & S_IFDIR)
shfl_flags = 0;
err = vboxsf_rename(sbi->root, old_path, new_path, shfl_flags);
if (err == 0) {
/* parent directories access/change time changed */
sf_new_parent_i->force_restat = 1;
sf_old_parent_i->force_restat = 1;
}
__putname(new_path);
err_put_old_path:
__putname(old_path);
return err;
}
static int vboxsf_dir_symlink(struct inode *parent, struct dentry *dentry,
const char *symname)
{
struct vboxsf_inode *sf_parent_i = VBOXSF_I(parent);
struct vboxsf_sbi *sbi = VBOXSF_SBI(parent->i_sb);
int symname_size = strlen(symname) + 1;
struct shfl_string *path, *ssymname;
struct shfl_fsobjinfo info;
int err;
path = vboxsf_path_from_dentry(sbi, dentry);
if (IS_ERR(path))
return PTR_ERR(path);
ssymname = kmalloc(SHFLSTRING_HEADER_SIZE + symname_size, GFP_KERNEL);
if (!ssymname) {
__putname(path);
return -ENOMEM;
}
ssymname->length = symname_size - 1;
ssymname->size = symname_size;
memcpy(ssymname->string.utf8, symname, symname_size);
err = vboxsf_symlink(sbi->root, path, ssymname, &info);
kfree(ssymname);
__putname(path);
if (err) {
/* -EROFS means symlinks are note support -> -EPERM */
return (err == -EROFS) ? -EPERM : err;
}
err = vboxsf_dir_instantiate(parent, dentry, &info);
if (err)
return err;
/* parent directory access/change time changed */
sf_parent_i->force_restat = 1;
return 0;
}
const struct inode_operations vboxsf_dir_iops = {
.lookup = vboxsf_dir_lookup,
.create = vboxsf_dir_mkfile,
.mkdir = vboxsf_dir_mkdir,
.rmdir = vboxsf_dir_unlink,
.unlink = vboxsf_dir_unlink,
.rename = vboxsf_dir_rename,
.symlink = vboxsf_dir_symlink,
.getattr = vboxsf_getattr,
.setattr = vboxsf_setattr,
};

379
fs/vboxsf/file.c Normal file
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@@ -0,0 +1,379 @@
// SPDX-License-Identifier: MIT
/*
* VirtualBox Guest Shared Folders support: Regular file inode and file ops.
*
* Copyright (C) 2006-2018 Oracle Corporation
*/
#include <linux/mm.h>
#include <linux/page-flags.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/sizes.h>
#include "vfsmod.h"
struct vboxsf_handle {
u64 handle;
u32 root;
u32 access_flags;
struct kref refcount;
struct list_head head;
};
static int vboxsf_file_open(struct inode *inode, struct file *file)
{
struct vboxsf_inode *sf_i = VBOXSF_I(inode);
struct shfl_createparms params = {};
struct vboxsf_handle *sf_handle;
u32 access_flags = 0;
int err;
sf_handle = kmalloc(sizeof(*sf_handle), GFP_KERNEL);
if (!sf_handle)
return -ENOMEM;
/*
* We check the value of params.handle afterwards to find out if
* the call succeeded or failed, as the API does not seem to cleanly
* distinguish error and informational messages.
*
* Furthermore, we must set params.handle to SHFL_HANDLE_NIL to
* make the shared folders host service use our mode parameter.
*/
params.handle = SHFL_HANDLE_NIL;
if (file->f_flags & O_CREAT) {
params.create_flags |= SHFL_CF_ACT_CREATE_IF_NEW;
/*
* We ignore O_EXCL, as the Linux kernel seems to call create
* beforehand itself, so O_EXCL should always fail.
*/
if (file->f_flags & O_TRUNC)
params.create_flags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
else
params.create_flags |= SHFL_CF_ACT_OPEN_IF_EXISTS;
} else {
params.create_flags |= SHFL_CF_ACT_FAIL_IF_NEW;
if (file->f_flags & O_TRUNC)
params.create_flags |= SHFL_CF_ACT_OVERWRITE_IF_EXISTS;
}
switch (file->f_flags & O_ACCMODE) {
case O_RDONLY:
access_flags |= SHFL_CF_ACCESS_READ;
break;
case O_WRONLY:
access_flags |= SHFL_CF_ACCESS_WRITE;
break;
case O_RDWR:
access_flags |= SHFL_CF_ACCESS_READWRITE;
break;
default:
WARN_ON(1);
}
if (file->f_flags & O_APPEND)
access_flags |= SHFL_CF_ACCESS_APPEND;
params.create_flags |= access_flags;
params.info.attr.mode = inode->i_mode;
err = vboxsf_create_at_dentry(file_dentry(file), &params);
if (err == 0 && params.handle == SHFL_HANDLE_NIL)
err = (params.result == SHFL_FILE_EXISTS) ? -EEXIST : -ENOENT;
if (err) {
kfree(sf_handle);
return err;
}
/* the host may have given us different attr then requested */
sf_i->force_restat = 1;
/* init our handle struct and add it to the inode's handles list */
sf_handle->handle = params.handle;
sf_handle->root = VBOXSF_SBI(inode->i_sb)->root;
sf_handle->access_flags = access_flags;
kref_init(&sf_handle->refcount);
mutex_lock(&sf_i->handle_list_mutex);
list_add(&sf_handle->head, &sf_i->handle_list);
mutex_unlock(&sf_i->handle_list_mutex);
file->private_data = sf_handle;
return 0;
}
static void vboxsf_handle_release(struct kref *refcount)
{
struct vboxsf_handle *sf_handle =
container_of(refcount, struct vboxsf_handle, refcount);
vboxsf_close(sf_handle->root, sf_handle->handle);
kfree(sf_handle);
}
static int vboxsf_file_release(struct inode *inode, struct file *file)
{
struct vboxsf_inode *sf_i = VBOXSF_I(inode);
struct vboxsf_handle *sf_handle = file->private_data;
/*
* When a file is closed on our (the guest) side, we want any subsequent
* accesses done on the host side to see all changes done from our side.
*/
filemap_write_and_wait(inode->i_mapping);
mutex_lock(&sf_i->handle_list_mutex);
list_del(&sf_handle->head);
mutex_unlock(&sf_i->handle_list_mutex);
kref_put(&sf_handle->refcount, vboxsf_handle_release);
return 0;
}
/*
* Write back dirty pages now, because there may not be any suitable
* open files later
*/
static void vboxsf_vma_close(struct vm_area_struct *vma)
{
filemap_write_and_wait(vma->vm_file->f_mapping);
}
static const struct vm_operations_struct vboxsf_file_vm_ops = {
.close = vboxsf_vma_close,
.fault = filemap_fault,
.map_pages = filemap_map_pages,
};
static int vboxsf_file_mmap(struct file *file, struct vm_area_struct *vma)
{
int err;
err = generic_file_mmap(file, vma);
if (!err)
vma->vm_ops = &vboxsf_file_vm_ops;
return err;
}
/*
* Note that since we are accessing files on the host's filesystem, files
* may always be changed underneath us by the host!
*
* The vboxsf API between the guest and the host does not offer any functions
* to deal with this. There is no inode-generation to check for changes, no
* events / callback on changes and no way to lock files.
*
* To avoid returning stale data when a file gets *opened* on our (the guest)
* side, we do a "stat" on the host side, then compare the mtime with the
* last known mtime and invalidate the page-cache if they differ.
* This is done from vboxsf_inode_revalidate().
*
* When reads are done through the read_iter fop, it is possible to do
* further cache revalidation then, there are 3 options to deal with this:
*
* 1) Rely solely on the revalidation done at open time
* 2) Do another "stat" and compare mtime again. Unfortunately the vboxsf
* host API does not allow stat on handles, so we would need to use
* file->f_path.dentry and the stat will then fail if the file was unlinked
* or renamed (and there is no thing like NFS' silly-rename). So we get:
* 2a) "stat" and compare mtime, on stat failure invalidate the cache
* 2b) "stat" and compare mtime, on stat failure do nothing
* 3) Simply always call invalidate_inode_pages2_range on the range of the read
*
* Currently we are keeping things KISS and using option 1. this allows
* directly using generic_file_read_iter without wrapping it.
*
* This means that only data written on the host side before open() on
* the guest side is guaranteed to be seen by the guest. If necessary
* we may provide other read-cache strategies in the future and make this
* configurable through a mount option.
*/
const struct file_operations vboxsf_reg_fops = {
.llseek = generic_file_llseek,
.read_iter = generic_file_read_iter,
.write_iter = generic_file_write_iter,
.mmap = vboxsf_file_mmap,
.open = vboxsf_file_open,
.release = vboxsf_file_release,
.fsync = noop_fsync,
.splice_read = generic_file_splice_read,
};
const struct inode_operations vboxsf_reg_iops = {
.getattr = vboxsf_getattr,
.setattr = vboxsf_setattr
};
static int vboxsf_readpage(struct file *file, struct page *page)
{
struct vboxsf_handle *sf_handle = file->private_data;
loff_t off = page_offset(page);
u32 nread = PAGE_SIZE;
u8 *buf;
int err;
buf = kmap(page);
err = vboxsf_read(sf_handle->root, sf_handle->handle, off, &nread, buf);
if (err == 0) {
memset(&buf[nread], 0, PAGE_SIZE - nread);
flush_dcache_page(page);
SetPageUptodate(page);
} else {
SetPageError(page);
}
kunmap(page);
unlock_page(page);
return err;
}
static struct vboxsf_handle *vboxsf_get_write_handle(struct vboxsf_inode *sf_i)
{
struct vboxsf_handle *h, *sf_handle = NULL;
mutex_lock(&sf_i->handle_list_mutex);
list_for_each_entry(h, &sf_i->handle_list, head) {
if (h->access_flags == SHFL_CF_ACCESS_WRITE ||
h->access_flags == SHFL_CF_ACCESS_READWRITE) {
kref_get(&h->refcount);
sf_handle = h;
break;
}
}
mutex_unlock(&sf_i->handle_list_mutex);
return sf_handle;
}
static int vboxsf_writepage(struct page *page, struct writeback_control *wbc)
{
struct inode *inode = page->mapping->host;
struct vboxsf_inode *sf_i = VBOXSF_I(inode);
struct vboxsf_handle *sf_handle;
loff_t off = page_offset(page);
loff_t size = i_size_read(inode);
u32 nwrite = PAGE_SIZE;
u8 *buf;
int err;
if (off + PAGE_SIZE > size)
nwrite = size & ~PAGE_MASK;
sf_handle = vboxsf_get_write_handle(sf_i);
if (!sf_handle)
return -EBADF;
buf = kmap(page);
err = vboxsf_write(sf_handle->root, sf_handle->handle,
off, &nwrite, buf);
kunmap(page);
kref_put(&sf_handle->refcount, vboxsf_handle_release);
if (err == 0) {
ClearPageError(page);
/* mtime changed */
sf_i->force_restat = 1;
} else {
ClearPageUptodate(page);
}
unlock_page(page);
return err;
}
static int vboxsf_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned int len, unsigned int copied,
struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
struct vboxsf_handle *sf_handle = file->private_data;
unsigned int from = pos & ~PAGE_MASK;
u32 nwritten = len;
u8 *buf;
int err;
/* zero the stale part of the page if we did a short copy */
if (!PageUptodate(page) && copied < len)
zero_user(page, from + copied, len - copied);
buf = kmap(page);
err = vboxsf_write(sf_handle->root, sf_handle->handle,
pos, &nwritten, buf + from);
kunmap(page);
if (err) {
nwritten = 0;
goto out;
}
/* mtime changed */
VBOXSF_I(inode)->force_restat = 1;
if (!PageUptodate(page) && nwritten == PAGE_SIZE)
SetPageUptodate(page);
pos += nwritten;
if (pos > inode->i_size)
i_size_write(inode, pos);
out:
unlock_page(page);
put_page(page);
return nwritten;
}
/*
* Note simple_write_begin does not read the page from disk on partial writes
* this is ok since vboxsf_write_end only writes the written parts of the
* page and it does not call SetPageUptodate for partial writes.
*/
const struct address_space_operations vboxsf_reg_aops = {
.readpage = vboxsf_readpage,
.writepage = vboxsf_writepage,
.set_page_dirty = __set_page_dirty_nobuffers,
.write_begin = simple_write_begin,
.write_end = vboxsf_write_end,
};
static const char *vboxsf_get_link(struct dentry *dentry, struct inode *inode,
struct delayed_call *done)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
struct shfl_string *path;
char *link;
int err;
if (!dentry)
return ERR_PTR(-ECHILD);
path = vboxsf_path_from_dentry(sbi, dentry);
if (IS_ERR(path))
return ERR_CAST(path);
link = kzalloc(PATH_MAX, GFP_KERNEL);
if (!link) {
__putname(path);
return ERR_PTR(-ENOMEM);
}
err = vboxsf_readlink(sbi->root, path, PATH_MAX, link);
__putname(path);
if (err) {
kfree(link);
return ERR_PTR(err);
}
set_delayed_call(done, kfree_link, link);
return link;
}
const struct inode_operations vboxsf_lnk_iops = {
.get_link = vboxsf_get_link
};

901
fs/vboxsf/shfl_hostintf.h Normal file
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491
fs/vboxsf/super.c Normal file
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// SPDX-License-Identifier: MIT
/*
* VirtualBox Guest Shared Folders support: Virtual File System.
*
* Module initialization/finalization
* File system registration/deregistration
* Superblock reading
* Few utility functions
*
* Copyright (C) 2006-2018 Oracle Corporation
*/
#include <linux/idr.h>
#include <linux/fs_parser.h>
#include <linux/magic.h>
#include <linux/module.h>
#include <linux/nls.h>
#include <linux/statfs.h>
#include <linux/vbox_utils.h>
#include "vfsmod.h"
#define VBOXSF_SUPER_MAGIC 0x786f4256 /* 'VBox' little endian */
#define VBSF_MOUNT_SIGNATURE_BYTE_0 ('\000')
#define VBSF_MOUNT_SIGNATURE_BYTE_1 ('\377')
#define VBSF_MOUNT_SIGNATURE_BYTE_2 ('\376')
#define VBSF_MOUNT_SIGNATURE_BYTE_3 ('\375')
static int follow_symlinks;
module_param(follow_symlinks, int, 0444);
MODULE_PARM_DESC(follow_symlinks,
"Let host resolve symlinks rather than showing them");
static DEFINE_IDA(vboxsf_bdi_ida);
static DEFINE_MUTEX(vboxsf_setup_mutex);
static bool vboxsf_setup_done;
static struct super_operations vboxsf_super_ops; /* forward declaration */
static struct kmem_cache *vboxsf_inode_cachep;
static char * const vboxsf_default_nls = CONFIG_NLS_DEFAULT;
enum { opt_nls, opt_uid, opt_gid, opt_ttl, opt_dmode, opt_fmode,
opt_dmask, opt_fmask };
static const struct fs_parameter_spec vboxsf_fs_parameters[] = {
fsparam_string ("nls", opt_nls),
fsparam_u32 ("uid", opt_uid),
fsparam_u32 ("gid", opt_gid),
fsparam_u32 ("ttl", opt_ttl),
fsparam_u32oct ("dmode", opt_dmode),
fsparam_u32oct ("fmode", opt_fmode),
fsparam_u32oct ("dmask", opt_dmask),
fsparam_u32oct ("fmask", opt_fmask),
{}
};
static int vboxsf_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct vboxsf_fs_context *ctx = fc->fs_private;
struct fs_parse_result result;
kuid_t uid;
kgid_t gid;
int opt;
opt = fs_parse(fc, vboxsf_fs_parameters, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case opt_nls:
if (ctx->nls_name || fc->purpose != FS_CONTEXT_FOR_MOUNT) {
vbg_err("vboxsf: Cannot reconfigure nls option\n");
return -EINVAL;
}
ctx->nls_name = param->string;
param->string = NULL;
break;
case opt_uid:
uid = make_kuid(current_user_ns(), result.uint_32);
if (!uid_valid(uid))
return -EINVAL;
ctx->o.uid = uid;
break;
case opt_gid:
gid = make_kgid(current_user_ns(), result.uint_32);
if (!gid_valid(gid))
return -EINVAL;
ctx->o.gid = gid;
break;
case opt_ttl:
ctx->o.ttl = msecs_to_jiffies(result.uint_32);
break;
case opt_dmode:
if (result.uint_32 & ~0777)
return -EINVAL;
ctx->o.dmode = result.uint_32;
ctx->o.dmode_set = true;
break;
case opt_fmode:
if (result.uint_32 & ~0777)
return -EINVAL;
ctx->o.fmode = result.uint_32;
ctx->o.fmode_set = true;
break;
case opt_dmask:
if (result.uint_32 & ~07777)
return -EINVAL;
ctx->o.dmask = result.uint_32;
break;
case opt_fmask:
if (result.uint_32 & ~07777)
return -EINVAL;
ctx->o.fmask = result.uint_32;
break;
default:
return -EINVAL;
}
return 0;
}
static int vboxsf_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct vboxsf_fs_context *ctx = fc->fs_private;
struct shfl_string *folder_name, root_path;
struct vboxsf_sbi *sbi;
struct dentry *droot;
struct inode *iroot;
char *nls_name;
size_t size;
int err;
if (!fc->source)
return -EINVAL;
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sbi->o = ctx->o;
idr_init(&sbi->ino_idr);
spin_lock_init(&sbi->ino_idr_lock);
sbi->next_generation = 1;
sbi->bdi_id = -1;
/* Load nls if not utf8 */
nls_name = ctx->nls_name ? ctx->nls_name : vboxsf_default_nls;
if (strcmp(nls_name, "utf8") != 0) {
if (nls_name == vboxsf_default_nls)
sbi->nls = load_nls_default();
else
sbi->nls = load_nls(nls_name);
if (!sbi->nls) {
vbg_err("vboxsf: Count not load '%s' nls\n", nls_name);
err = -EINVAL;
goto fail_free;
}
}
sbi->bdi_id = ida_simple_get(&vboxsf_bdi_ida, 0, 0, GFP_KERNEL);
if (sbi->bdi_id < 0) {
err = sbi->bdi_id;
goto fail_free;
}
err = super_setup_bdi_name(sb, "vboxsf-%s.%d", fc->source, sbi->bdi_id);
if (err)
goto fail_free;
/* Turn source into a shfl_string and map the folder */
size = strlen(fc->source) + 1;
folder_name = kmalloc(SHFLSTRING_HEADER_SIZE + size, GFP_KERNEL);
if (!folder_name) {
err = -ENOMEM;
goto fail_free;
}
folder_name->size = size;
folder_name->length = size - 1;
strlcpy(folder_name->string.utf8, fc->source, size);
err = vboxsf_map_folder(folder_name, &sbi->root);
kfree(folder_name);
if (err) {
vbg_err("vboxsf: Host rejected mount of '%s' with error %d\n",
fc->source, err);
goto fail_free;
}
root_path.length = 1;
root_path.size = 2;
root_path.string.utf8[0] = '/';
root_path.string.utf8[1] = 0;
err = vboxsf_stat(sbi, &root_path, &sbi->root_info);
if (err)
goto fail_unmap;
sb->s_magic = VBOXSF_SUPER_MAGIC;
sb->s_blocksize = 1024;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_op = &vboxsf_super_ops;
sb->s_d_op = &vboxsf_dentry_ops;
iroot = iget_locked(sb, 0);
if (!iroot) {
err = -ENOMEM;
goto fail_unmap;
}
vboxsf_init_inode(sbi, iroot, &sbi->root_info);
unlock_new_inode(iroot);
droot = d_make_root(iroot);
if (!droot) {
err = -ENOMEM;
goto fail_unmap;
}
sb->s_root = droot;
sb->s_fs_info = sbi;
return 0;
fail_unmap:
vboxsf_unmap_folder(sbi->root);
fail_free:
if (sbi->bdi_id >= 0)
ida_simple_remove(&vboxsf_bdi_ida, sbi->bdi_id);
if (sbi->nls)
unload_nls(sbi->nls);
idr_destroy(&sbi->ino_idr);
kfree(sbi);
return err;
}
static void vboxsf_inode_init_once(void *data)
{
struct vboxsf_inode *sf_i = data;
mutex_init(&sf_i->handle_list_mutex);
inode_init_once(&sf_i->vfs_inode);
}
static struct inode *vboxsf_alloc_inode(struct super_block *sb)
{
struct vboxsf_inode *sf_i;
sf_i = kmem_cache_alloc(vboxsf_inode_cachep, GFP_NOFS);
if (!sf_i)
return NULL;
sf_i->force_restat = 0;
INIT_LIST_HEAD(&sf_i->handle_list);
return &sf_i->vfs_inode;
}
static void vboxsf_free_inode(struct inode *inode)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
unsigned long flags;
spin_lock_irqsave(&sbi->ino_idr_lock, flags);
idr_remove(&sbi->ino_idr, inode->i_ino);
spin_unlock_irqrestore(&sbi->ino_idr_lock, flags);
kmem_cache_free(vboxsf_inode_cachep, VBOXSF_I(inode));
}
static void vboxsf_put_super(struct super_block *sb)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(sb);
vboxsf_unmap_folder(sbi->root);
if (sbi->bdi_id >= 0)
ida_simple_remove(&vboxsf_bdi_ida, sbi->bdi_id);
if (sbi->nls)
unload_nls(sbi->nls);
/*
* vboxsf_free_inode uses the idr, make sure all delayed rcu free
* inodes are flushed.
*/
rcu_barrier();
idr_destroy(&sbi->ino_idr);
kfree(sbi);
}
static int vboxsf_statfs(struct dentry *dentry, struct kstatfs *stat)
{
struct super_block *sb = dentry->d_sb;
struct shfl_volinfo shfl_volinfo;
struct vboxsf_sbi *sbi;
u32 buf_len;
int err;
sbi = VBOXSF_SBI(sb);
buf_len = sizeof(shfl_volinfo);
err = vboxsf_fsinfo(sbi->root, 0, SHFL_INFO_GET | SHFL_INFO_VOLUME,
&buf_len, &shfl_volinfo);
if (err)
return err;
stat->f_type = VBOXSF_SUPER_MAGIC;
stat->f_bsize = shfl_volinfo.bytes_per_allocation_unit;
do_div(shfl_volinfo.total_allocation_bytes,
shfl_volinfo.bytes_per_allocation_unit);
stat->f_blocks = shfl_volinfo.total_allocation_bytes;
do_div(shfl_volinfo.available_allocation_bytes,
shfl_volinfo.bytes_per_allocation_unit);
stat->f_bfree = shfl_volinfo.available_allocation_bytes;
stat->f_bavail = shfl_volinfo.available_allocation_bytes;
stat->f_files = 1000;
/*
* Don't return 0 here since the guest may then think that it is not
* possible to create any more files.
*/
stat->f_ffree = 1000000;
stat->f_fsid.val[0] = 0;
stat->f_fsid.val[1] = 0;
stat->f_namelen = 255;
return 0;
}
static struct super_operations vboxsf_super_ops = {
.alloc_inode = vboxsf_alloc_inode,
.free_inode = vboxsf_free_inode,
.put_super = vboxsf_put_super,
.statfs = vboxsf_statfs,
};
static int vboxsf_setup(void)
{
int err;
mutex_lock(&vboxsf_setup_mutex);
if (vboxsf_setup_done)
goto success;
vboxsf_inode_cachep =
kmem_cache_create("vboxsf_inode_cache",
sizeof(struct vboxsf_inode), 0,
(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD |
SLAB_ACCOUNT),
vboxsf_inode_init_once);
if (!vboxsf_inode_cachep) {
err = -ENOMEM;
goto fail_nomem;
}
err = vboxsf_connect();
if (err) {
vbg_err("vboxsf: err %d connecting to guest PCI-device\n", err);
vbg_err("vboxsf: make sure you are inside a VirtualBox VM\n");
vbg_err("vboxsf: and check dmesg for vboxguest errors\n");
goto fail_free_cache;
}
err = vboxsf_set_utf8();
if (err) {
vbg_err("vboxsf_setutf8 error %d\n", err);
goto fail_disconnect;
}
if (!follow_symlinks) {
err = vboxsf_set_symlinks();
if (err)
vbg_warn("vboxsf: Unable to show symlinks: %d\n", err);
}
vboxsf_setup_done = true;
success:
mutex_unlock(&vboxsf_setup_mutex);
return 0;
fail_disconnect:
vboxsf_disconnect();
fail_free_cache:
kmem_cache_destroy(vboxsf_inode_cachep);
fail_nomem:
mutex_unlock(&vboxsf_setup_mutex);
return err;
}
static int vboxsf_parse_monolithic(struct fs_context *fc, void *data)
{
char *options = data;
if (options && options[0] == VBSF_MOUNT_SIGNATURE_BYTE_0 &&
options[1] == VBSF_MOUNT_SIGNATURE_BYTE_1 &&
options[2] == VBSF_MOUNT_SIGNATURE_BYTE_2 &&
options[3] == VBSF_MOUNT_SIGNATURE_BYTE_3) {
vbg_err("vboxsf: Old binary mount data not supported, remove obsolete mount.vboxsf and/or update your VBoxService.\n");
return -EINVAL;
}
return generic_parse_monolithic(fc, data);
}
static int vboxsf_get_tree(struct fs_context *fc)
{
int err;
err = vboxsf_setup();
if (err)
return err;
return get_tree_nodev(fc, vboxsf_fill_super);
}
static int vboxsf_reconfigure(struct fs_context *fc)
{
struct vboxsf_sbi *sbi = VBOXSF_SBI(fc->root->d_sb);
struct vboxsf_fs_context *ctx = fc->fs_private;
struct inode *iroot = fc->root->d_sb->s_root->d_inode;
/* Apply changed options to the root inode */
sbi->o = ctx->o;
vboxsf_init_inode(sbi, iroot, &sbi->root_info);
return 0;
}
static void vboxsf_free_fc(struct fs_context *fc)
{
struct vboxsf_fs_context *ctx = fc->fs_private;
kfree(ctx->nls_name);
kfree(ctx);
}
static const struct fs_context_operations vboxsf_context_ops = {
.free = vboxsf_free_fc,
.parse_param = vboxsf_parse_param,
.parse_monolithic = vboxsf_parse_monolithic,
.get_tree = vboxsf_get_tree,
.reconfigure = vboxsf_reconfigure,
};
static int vboxsf_init_fs_context(struct fs_context *fc)
{
struct vboxsf_fs_context *ctx;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
current_uid_gid(&ctx->o.uid, &ctx->o.gid);
fc->fs_private = ctx;
fc->ops = &vboxsf_context_ops;
return 0;
}
static struct file_system_type vboxsf_fs_type = {
.owner = THIS_MODULE,
.name = "vboxsf",
.init_fs_context = vboxsf_init_fs_context,
.kill_sb = kill_anon_super
};
/* Module initialization/finalization handlers */
static int __init vboxsf_init(void)
{
return register_filesystem(&vboxsf_fs_type);
}
static void __exit vboxsf_fini(void)
{
unregister_filesystem(&vboxsf_fs_type);
mutex_lock(&vboxsf_setup_mutex);
if (vboxsf_setup_done) {
vboxsf_disconnect();
/*
* Make sure all delayed rcu free inodes are flushed
* before we destroy the cache.
*/
rcu_barrier();
kmem_cache_destroy(vboxsf_inode_cachep);
}
mutex_unlock(&vboxsf_setup_mutex);
}
module_init(vboxsf_init);
module_exit(vboxsf_fini);
MODULE_DESCRIPTION("Oracle VM VirtualBox Module for Host File System Access");
MODULE_AUTHOR("Oracle Corporation");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_FS("vboxsf");

551
fs/vboxsf/utils.c Normal file
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371
fs/vboxsf/vboxsf_wrappers.c Normal file
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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);
}

137
fs/vboxsf/vfsmod.h Normal file
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@@ -0,0 +1,137 @@
/* SPDX-License-Identifier: MIT */
/*
* VirtualBox Guest Shared Folders support: module header.
*
* Copyright (C) 2006-2018 Oracle Corporation
*/
#ifndef VFSMOD_H
#define VFSMOD_H
#include <linux/backing-dev.h>
#include <linux/idr.h>
#include "shfl_hostintf.h"
#define DIR_BUFFER_SIZE SZ_16K
/* The cast is to prevent assignment of void * to pointers of arbitrary type */
#define VBOXSF_SBI(sb) ((struct vboxsf_sbi *)(sb)->s_fs_info)
#define VBOXSF_I(i) container_of(i, struct vboxsf_inode, vfs_inode)
struct vboxsf_options {
unsigned long ttl;
kuid_t uid;
kgid_t gid;
bool dmode_set;
bool fmode_set;
umode_t dmode;
umode_t fmode;
umode_t dmask;
umode_t fmask;
};
struct vboxsf_fs_context {
struct vboxsf_options o;
char *nls_name;
};
/* per-shared folder information */
struct vboxsf_sbi {
struct vboxsf_options o;
struct shfl_fsobjinfo root_info;
struct idr ino_idr;
spinlock_t ino_idr_lock; /* This protects ino_idr */
struct nls_table *nls;
u32 next_generation;
u32 root;
int bdi_id;
};
/* per-inode information */
struct vboxsf_inode {
/* some information was changed, update data on next revalidate */
int force_restat;
/* list of open handles for this inode + lock protecting it */
struct list_head handle_list;
/* This mutex protects handle_list accesses */
struct mutex handle_list_mutex;
/* The VFS inode struct */
struct inode vfs_inode;
};
struct vboxsf_dir_info {
struct list_head info_list;
};
struct vboxsf_dir_buf {
size_t entries;
size_t free;
size_t used;
void *buf;
struct list_head head;
};
/* globals */
extern const struct inode_operations vboxsf_dir_iops;
extern const struct inode_operations vboxsf_lnk_iops;
extern const struct inode_operations vboxsf_reg_iops;
extern const struct file_operations vboxsf_dir_fops;
extern const struct file_operations vboxsf_reg_fops;
extern const struct address_space_operations vboxsf_reg_aops;
extern const struct dentry_operations vboxsf_dentry_ops;
/* from utils.c */
struct inode *vboxsf_new_inode(struct super_block *sb);
void vboxsf_init_inode(struct vboxsf_sbi *sbi, struct inode *inode,
const struct shfl_fsobjinfo *info);
int vboxsf_create_at_dentry(struct dentry *dentry,
struct shfl_createparms *params);
int vboxsf_stat(struct vboxsf_sbi *sbi, struct shfl_string *path,
struct shfl_fsobjinfo *info);
int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info);
int vboxsf_inode_revalidate(struct dentry *dentry);
int vboxsf_getattr(const struct path *path, struct kstat *kstat,
u32 request_mask, unsigned int query_flags);
int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr);
struct shfl_string *vboxsf_path_from_dentry(struct vboxsf_sbi *sbi,
struct dentry *dentry);
int vboxsf_nlscpy(struct vboxsf_sbi *sbi, char *name, size_t name_bound_len,
const unsigned char *utf8_name, size_t utf8_len);
struct vboxsf_dir_info *vboxsf_dir_info_alloc(void);
void vboxsf_dir_info_free(struct vboxsf_dir_info *p);
int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,
u64 handle);
/* from vboxsf_wrappers.c */
int vboxsf_connect(void);
void vboxsf_disconnect(void);
int vboxsf_create(u32 root, struct shfl_string *parsed_path,
struct shfl_createparms *create_parms);
int vboxsf_close(u32 root, u64 handle);
int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags);
int vboxsf_rename(u32 root, struct shfl_string *src_path,
struct shfl_string *dest_path, u32 flags);
int vboxsf_read(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
int vboxsf_write(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
int vboxsf_dirinfo(u32 root, u64 handle,
struct shfl_string *parsed_path, u32 flags, u32 index,
u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count);
int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
u32 *buf_len, void *buf);
int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root);
int vboxsf_unmap_folder(u32 root);
int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
u32 buf_len, u8 *buf);
int vboxsf_symlink(u32 root, struct shfl_string *new_path,
struct shfl_string *old_path, struct shfl_fsobjinfo *buf);
int vboxsf_set_utf8(void);
int vboxsf_set_symlinks(void);
#endif