mirror of
https://github.com/torvalds/linux
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0fd1695766
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>
137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* VirtualBox Guest Shared Folders support: module header.
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*
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* Copyright (C) 2006-2018 Oracle Corporation
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*/
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#ifndef VFSMOD_H
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#define VFSMOD_H
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#include <linux/backing-dev.h>
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#include <linux/idr.h>
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#include "shfl_hostintf.h"
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#define DIR_BUFFER_SIZE SZ_16K
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/* The cast is to prevent assignment of void * to pointers of arbitrary type */
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#define VBOXSF_SBI(sb) ((struct vboxsf_sbi *)(sb)->s_fs_info)
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#define VBOXSF_I(i) container_of(i, struct vboxsf_inode, vfs_inode)
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struct vboxsf_options {
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unsigned long ttl;
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kuid_t uid;
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kgid_t gid;
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bool dmode_set;
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bool fmode_set;
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umode_t dmode;
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umode_t fmode;
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umode_t dmask;
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umode_t fmask;
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};
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struct vboxsf_fs_context {
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struct vboxsf_options o;
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char *nls_name;
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};
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/* per-shared folder information */
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struct vboxsf_sbi {
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struct vboxsf_options o;
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struct shfl_fsobjinfo root_info;
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struct idr ino_idr;
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spinlock_t ino_idr_lock; /* This protects ino_idr */
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struct nls_table *nls;
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u32 next_generation;
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u32 root;
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int bdi_id;
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};
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/* per-inode information */
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struct vboxsf_inode {
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/* some information was changed, update data on next revalidate */
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int force_restat;
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/* list of open handles for this inode + lock protecting it */
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struct list_head handle_list;
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/* This mutex protects handle_list accesses */
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struct mutex handle_list_mutex;
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/* The VFS inode struct */
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struct inode vfs_inode;
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};
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struct vboxsf_dir_info {
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struct list_head info_list;
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};
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struct vboxsf_dir_buf {
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size_t entries;
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size_t free;
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size_t used;
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void *buf;
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struct list_head head;
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};
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/* globals */
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extern const struct inode_operations vboxsf_dir_iops;
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extern const struct inode_operations vboxsf_lnk_iops;
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extern const struct inode_operations vboxsf_reg_iops;
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extern const struct file_operations vboxsf_dir_fops;
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extern const struct file_operations vboxsf_reg_fops;
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extern const struct address_space_operations vboxsf_reg_aops;
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extern const struct dentry_operations vboxsf_dentry_ops;
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/* from utils.c */
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struct inode *vboxsf_new_inode(struct super_block *sb);
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void vboxsf_init_inode(struct vboxsf_sbi *sbi, struct inode *inode,
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const struct shfl_fsobjinfo *info);
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int vboxsf_create_at_dentry(struct dentry *dentry,
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struct shfl_createparms *params);
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int vboxsf_stat(struct vboxsf_sbi *sbi, struct shfl_string *path,
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struct shfl_fsobjinfo *info);
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int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info);
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int vboxsf_inode_revalidate(struct dentry *dentry);
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int vboxsf_getattr(const struct path *path, struct kstat *kstat,
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u32 request_mask, unsigned int query_flags);
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int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr);
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struct shfl_string *vboxsf_path_from_dentry(struct vboxsf_sbi *sbi,
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struct dentry *dentry);
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int vboxsf_nlscpy(struct vboxsf_sbi *sbi, char *name, size_t name_bound_len,
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const unsigned char *utf8_name, size_t utf8_len);
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struct vboxsf_dir_info *vboxsf_dir_info_alloc(void);
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void vboxsf_dir_info_free(struct vboxsf_dir_info *p);
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int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,
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u64 handle);
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/* from vboxsf_wrappers.c */
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int vboxsf_connect(void);
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void vboxsf_disconnect(void);
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int vboxsf_create(u32 root, struct shfl_string *parsed_path,
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struct shfl_createparms *create_parms);
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int vboxsf_close(u32 root, u64 handle);
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int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags);
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int vboxsf_rename(u32 root, struct shfl_string *src_path,
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struct shfl_string *dest_path, u32 flags);
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int vboxsf_read(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
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int vboxsf_write(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
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int vboxsf_dirinfo(u32 root, u64 handle,
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struct shfl_string *parsed_path, u32 flags, u32 index,
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u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count);
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int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
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u32 *buf_len, void *buf);
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int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root);
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int vboxsf_unmap_folder(u32 root);
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int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
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u32 buf_len, u8 *buf);
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int vboxsf_symlink(u32 root, struct shfl_string *new_path,
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struct shfl_string *old_path, struct shfl_fsobjinfo *buf);
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int vboxsf_set_utf8(void);
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int vboxsf_set_symlinks(void);
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#endif
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