fs/vboxsf/vfsmod.h

   1 /* SPDX-License-Identifier: MIT */
   2 /*
   3  * VirtualBox Guest Shared Folders support: module header.
   4  *
   5  * Copyright (C) 2006-2018 Oracle Corporation
   6  */
   7
   8 #ifndef VFSMOD_H
   9 #define VFSMOD_H
  10
  11 #include <linux/backing-dev.h>
  12 #include <linux/idr.h>
  13 #include "shfl_hostintf.h"
  14
  15 #define DIR_BUFFER_SIZE SZ_16K
  16
  17 /* The cast is to prevent assignment of void * to pointers of arbitrary type */
  18 #define VBOXSF_SBI(sb)  ((struct vboxsf_sbi *)(sb)->s_fs_info)
  19 #define VBOXSF_I(i)     container_of(i, struct vboxsf_inode, vfs_inode)
  20
  21 struct vboxsf_options {
  22         unsigned long ttl;
  23         kuid_t uid;
  24         kgid_t gid;
  25         bool dmode_set;
  26         bool fmode_set;
  27         umode_t dmode;
  28         umode_t fmode;
  29         umode_t dmask;
  30         umode_t fmask;
  31 };
  32
  33 struct vboxsf_fs_context {
  34         struct vboxsf_options o;
  35         char *nls_name;
  36 };
  37
  38 /* per-shared folder information */
  39 struct vboxsf_sbi {
  40         struct vboxsf_options o;
  41         struct shfl_fsobjinfo root_info;
  42         struct idr ino_idr;
  43         spinlock_t ino_idr_lock; /* This protects ino_idr */
  44         struct nls_table *nls;
  45         u32 next_generation;
  46         u32 root;
  47         int bdi_id;
  48 };
  49
  50 /* per-inode information */
  51 struct vboxsf_inode {
  52         /* some information was changed, update data on next revalidate */
  53         int force_restat;
  54         /* list of open handles for this inode + lock protecting it */
  55         struct list_head handle_list;
  56         /* This mutex protects handle_list accesses */
  57         struct mutex handle_list_mutex;
  58         /* The VFS inode struct */
  59         struct inode vfs_inode;
  60 };
  61
  62 struct vboxsf_dir_info {
  63         struct list_head info_list;
  64 };
  65
  66 struct vboxsf_dir_buf {
  67         size_t entries;
  68         size_t free;
  69         size_t used;
  70         void *buf;
  71         struct list_head head;
  72 };
  73
  74 /* globals */
  75 extern const struct inode_operations vboxsf_dir_iops;
  76 extern const struct inode_operations vboxsf_lnk_iops;
  77 extern const struct inode_operations vboxsf_reg_iops;
  78 extern const struct file_operations vboxsf_dir_fops;
  79 extern const struct file_operations vboxsf_reg_fops;
  80 extern const struct address_space_operations vboxsf_reg_aops;
  81 extern const struct dentry_operations vboxsf_dentry_ops;
  82
  83 /* from utils.c */
  84 struct inode *vboxsf_new_inode(struct super_block *sb);
  85 void vboxsf_init_inode(struct vboxsf_sbi *sbi, struct inode *inode,
  86                        const struct shfl_fsobjinfo *info);
  87 int vboxsf_create_at_dentry(struct dentry *dentry,
  88                             struct shfl_createparms *params);
  89 int vboxsf_stat(struct vboxsf_sbi *sbi, struct shfl_string *path,
  90                 struct shfl_fsobjinfo *info);
  91 int vboxsf_stat_dentry(struct dentry *dentry, struct shfl_fsobjinfo *info);
  92 int vboxsf_inode_revalidate(struct dentry *dentry);
  93 int vboxsf_getattr(const struct path *path, struct kstat *kstat,
  94                    u32 request_mask, unsigned int query_flags);
  95 int vboxsf_setattr(struct dentry *dentry, struct iattr *iattr);
  96 struct shfl_string *vboxsf_path_from_dentry(struct vboxsf_sbi *sbi,
  97                                             struct dentry *dentry);
  98 int vboxsf_nlscpy(struct vboxsf_sbi *sbi, char *name, size_t name_bound_len,
  99                   const unsigned char *utf8_name, size_t utf8_len);
 100 struct vboxsf_dir_info *vboxsf_dir_info_alloc(void);
 101 void vboxsf_dir_info_free(struct vboxsf_dir_info *p);
 102 int vboxsf_dir_read_all(struct vboxsf_sbi *sbi, struct vboxsf_dir_info *sf_d,
 103                         u64 handle);
 104
 105 /* from vboxsf_wrappers.c */
 106 int vboxsf_connect(void);
 107 void vboxsf_disconnect(void);
 108
 109 int vboxsf_create(u32 root, struct shfl_string *parsed_path,
 110                   struct shfl_createparms *create_parms);
 111
 112 int vboxsf_close(u32 root, u64 handle);
 113 int vboxsf_remove(u32 root, struct shfl_string *parsed_path, u32 flags);
 114 int vboxsf_rename(u32 root, struct shfl_string *src_path,
 115                   struct shfl_string *dest_path, u32 flags);
 116
 117 int vboxsf_read(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
 118 int vboxsf_write(u32 root, u64 handle, u64 offset, u32 *buf_len, u8 *buf);
 119
 120 int vboxsf_dirinfo(u32 root, u64 handle,
 121                    struct shfl_string *parsed_path, u32 flags, u32 index,
 122                    u32 *buf_len, struct shfl_dirinfo *buf, u32 *file_count);
 123 int vboxsf_fsinfo(u32 root, u64 handle, u32 flags,
 124                   u32 *buf_len, void *buf);
 125
 126 int vboxsf_map_folder(struct shfl_string *folder_name, u32 *root);
 127 int vboxsf_unmap_folder(u32 root);
 128
 129 int vboxsf_readlink(u32 root, struct shfl_string *parsed_path,
 130                     u32 buf_len, u8 *buf);
 131 int vboxsf_symlink(u32 root, struct shfl_string *new_path,
 132                    struct shfl_string *old_path, struct shfl_fsobjinfo *buf);
 133
 134 int vboxsf_set_utf8(void);
 135 int vboxsf_set_symlinks(void);
 136
 137 #endif