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/* $Id: vbsfmount.h $ */
/** @file
* vboxsf - VBox Linux Shared Folders VFS, mount(2) parameter structure.
*/
/*
* Copyright (C) 2006-2022 Oracle and/or its affiliates.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef GA_INCLUDED_SRC_linux_sharedfolders_vbsfmount_h
#define GA_INCLUDED_SRC_linux_sharedfolders_vbsfmount_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
/* Linux constrains the size of data mount argument to PAGE_SIZE - 1. */
#define MAX_MNTOPT_STR PAGE_SIZE
#define MAX_HOST_NAME 256
#define MAX_NLS_NAME 32
#define VBSF_DEFAULT_TTL_MS 200
#define VBSF_MOUNT_SIGNATURE_BYTE_0 '\377'
#define VBSF_MOUNT_SIGNATURE_BYTE_1 '\376'
#define VBSF_MOUNT_SIGNATURE_BYTE_2 '\375'
/**
* VBox Linux Shared Folders VFS caching mode.
*/
enum vbsf_cache_mode {
/** Use the kernel modules default caching mode (kVbsfCacheMode_Strict). */
kVbsfCacheMode_Default = 0,
/** No caching, go to the host for everything. This will have some minor
* coherency issues for memory mapping with unsynced dirty pages. */
kVbsfCacheMode_None,
/** No caching, except for files with writable memory mappings.
* (Note to future: if we do oplock like stuff, it goes in here.) */
kVbsfCacheMode_Strict,
/** Use page cache for reads.
* This improves guest performance for read intensive jobs, like compiling
* building. The flip side is that the guest may not see host modification in a
* timely manner and possibly update files with out-of-date cache information,
* as there exists no protocol for the host to notify the guest about file
* modifications. */
kVbsfCacheMode_Read,
/** Use page cache for both reads and writes as far as that's possible.
* This is good for guest performance, but the price is that the guest possibly
* ignoring host changes and the host not seeing guest changes in a timely
* manner. */
kVbsfCacheMode_ReadWrite,
/** End of valid values (exclusive). */
kVbsfCacheMode_End,
/** Make sure the enum is sizeof(int32_t). */
kVbsfCacheMode_32BitHack = 0x7fffffff
};
/**
* VBox Linux Shared Folders VFS mount options.
*/
struct vbsf_mount_info_new {
/**
* The old version of the mount_info struct started with a
* char name[MAX_HOST_NAME] field, where name cannot be '\0'.
* So the new version of the mount_info struct starts with a
* nullchar field which is always 0 so that we can detect and
* reject the old structure being passed.
*/
char nullchar;
/** Signature */
char signature[3];
/** Length of the whole structure */
int length;
/** Share name */
char name[MAX_HOST_NAME];
/** Name of an I/O charset */
char nls_name[MAX_NLS_NAME];
/** User ID for all entries, default 0=root */
int uid;
/** Group ID for all entries, default 0=root */
int gid;
/** Directory entry and inode time to live in milliseconds.
* -1 for kernel default, 0 to disable caching.
* @sa vbsf_mount_info_new::msDirCacheTTL, vbsf_mount_info_new::msInodeTTL */
int ttl;
/** Mode for directories if != -1. */
int dmode;
/** Mode for regular files if != -1. */
int fmode;
/** umask applied to directories */
int dmask;
/** umask applied to regular files */
int fmask;
/** Mount tag for VBoxService automounter.
* @since 6.0.0 */
char szTag[32];
/** Max pages to read & write at a time.
* @since 6.0.6 */
uint32_t cMaxIoPages;
/** The directory content buffer size. Set to 0 for kernel module default.
* Larger value reduces the number of host calls on large directories. */
uint32_t cbDirBuf;
/** The time to live for directory entries (in milliseconds). @a ttl is used
* if negative.
* @since 6.0.6 */
int32_t msDirCacheTTL;
/** The time to live for inode information (in milliseconds). @a ttl is used
* if negative.
* @since 6.0.6 */
int32_t msInodeTTL;
/** The cache and coherency mode.
* @since 6.0.6 */
enum vbsf_cache_mode enmCacheMode;
};
#ifdef AssertCompileSize
AssertCompileSize(struct vbsf_mount_info_new, 2*4 + MAX_HOST_NAME + MAX_NLS_NAME + 7*4 + 32 + 5*4);
#endif
/** Completes the mount operation by adding the new mount point to mtab if required. */
int vbsfmount_complete(const char *pszSharedFolder, const char *pszMountPoint,
unsigned long fFlags, const char *pszOpts);
#endif /* !GA_INCLUDED_SRC_linux_sharedfolders_vbsfmount_h */
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