include/linux/fscrypt_notsupp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * fscrypt_notsupp.h
   4  *
   5  * This stubs out the fscrypt functions for filesystems configured without
   6  * encryption support.
   7  *
   8  * Do not include this file directly. Use fscrypt.h instead!
   9  */
  10 #ifndef _LINUX_FSCRYPT_H
  11 #error "Incorrect include of linux/fscrypt_notsupp.h!"
  12 #endif
  13
  14 #ifndef _LINUX_FSCRYPT_NOTSUPP_H
  15 #define _LINUX_FSCRYPT_NOTSUPP_H
  16
  17 static inline bool fscrypt_has_encryption_key(const struct inode *inode)
  18 {
  19         return false;
  20 }
  21
  22 static inline bool fscrypt_dummy_context_enabled(struct inode *inode)
  23 {
  24         return false;
  25 }
  26
  27 /* crypto.c */
  28 static inline struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode,
  29                                                   gfp_t gfp_flags)
  30 {
  31         return ERR_PTR(-EOPNOTSUPP);
  32 }
  33
  34 static inline void fscrypt_release_ctx(struct fscrypt_ctx *ctx)
  35 {
  36         return;
  37 }
  38
  39 static inline struct page *fscrypt_encrypt_page(const struct inode *inode,
  40                                                 struct page *page,
  41                                                 unsigned int len,
  42                                                 unsigned int offs,
  43                                                 u64 lblk_num, gfp_t gfp_flags)
  44 {
  45         return ERR_PTR(-EOPNOTSUPP);
  46 }
  47
  48 static inline int fscrypt_decrypt_page(const struct inode *inode,
  49                                        struct page *page,
  50                                        unsigned int len, unsigned int offs,
  51                                        u64 lblk_num)
  52 {
  53         return -EOPNOTSUPP;
  54 }
  55
  56 static inline struct page *fscrypt_control_page(struct page *page)
  57 {
  58         WARN_ON_ONCE(1);
  59         return ERR_PTR(-EINVAL);
  60 }
  61
  62 static inline void fscrypt_restore_control_page(struct page *page)
  63 {
  64         return;
  65 }
  66
  67 /* policy.c */
  68 static inline int fscrypt_ioctl_set_policy(struct file *filp,
  69                                            const void __user *arg)
  70 {
  71         return -EOPNOTSUPP;
  72 }
  73
  74 static inline int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg)
  75 {
  76         return -EOPNOTSUPP;
  77 }
  78
  79 static inline int fscrypt_has_permitted_context(struct inode *parent,
  80                                                 struct inode *child)
  81 {
  82         return 0;
  83 }
  84
  85 static inline int fscrypt_inherit_context(struct inode *parent,
  86                                           struct inode *child,
  87                                           void *fs_data, bool preload)
  88 {
  89         return -EOPNOTSUPP;
  90 }
  91
  92 /* keyinfo.c */
  93 static inline int fscrypt_get_encryption_info(struct inode *inode)
  94 {
  95         return -EOPNOTSUPP;
  96 }
  97
  98 static inline void fscrypt_put_encryption_info(struct inode *inode)
  99 {
 100         return;
 101 }
 102
 103  /* fname.c */
 104 static inline int fscrypt_setup_filename(struct inode *dir,
 105                                          const struct qstr *iname,
 106                                          int lookup, struct fscrypt_name *fname)
 107 {
 108         if (IS_ENCRYPTED(dir))
 109                 return -EOPNOTSUPP;
 110
 111         memset(fname, 0, sizeof(struct fscrypt_name));
 112         fname->usr_fname = iname;
 113         fname->disk_name.name = (unsigned char *)iname->name;
 114         fname->disk_name.len = iname->len;
 115         return 0;
 116 }
 117
 118 static inline void fscrypt_free_filename(struct fscrypt_name *fname)
 119 {
 120         return;
 121 }
 122
 123 static inline int fscrypt_fname_alloc_buffer(const struct inode *inode,
 124                                              u32 max_encrypted_len,
 125                                              struct fscrypt_str *crypto_str)
 126 {
 127         return -EOPNOTSUPP;
 128 }
 129
 130 static inline void fscrypt_fname_free_buffer(struct fscrypt_str *crypto_str)
 131 {
 132         return;
 133 }
 134
 135 static inline int fscrypt_fname_disk_to_usr(struct inode *inode,
 136                                             u32 hash, u32 minor_hash,
 137                                             const struct fscrypt_str *iname,
 138                                             struct fscrypt_str *oname)
 139 {
 140         return -EOPNOTSUPP;
 141 }
 142
 143 static inline bool fscrypt_match_name(const struct fscrypt_name *fname,
 144                                       const u8 *de_name, u32 de_name_len)
 145 {
 146         /* Encryption support disabled; use standard comparison */
 147         if (de_name_len != fname->disk_name.len)
 148                 return false;
 149         return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len);
 150 }
 151
 152 /* bio.c */
 153 static inline void fscrypt_decrypt_bio_pages(struct fscrypt_ctx *ctx,
 154                                              struct bio *bio)
 155 {
 156         return;
 157 }
 158
 159 static inline void fscrypt_pullback_bio_page(struct page **page, bool restore)
 160 {
 161         return;
 162 }
 163
 164 static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
 165                                         sector_t pblk, unsigned int len)
 166 {
 167         return -EOPNOTSUPP;
 168 }
 169
 170 /* hooks.c */
 171
 172 static inline int fscrypt_file_open(struct inode *inode, struct file *filp)
 173 {
 174         if (IS_ENCRYPTED(inode))
 175                 return -EOPNOTSUPP;
 176         return 0;
 177 }
 178
 179 static inline int __fscrypt_prepare_link(struct inode *inode,
 180                                          struct inode *dir)
 181 {
 182         return -EOPNOTSUPP;
 183 }
 184
 185 static inline int __fscrypt_prepare_rename(struct inode *old_dir,
 186                                            struct dentry *old_dentry,
 187                                            struct inode *new_dir,
 188                                            struct dentry *new_dentry,
 189                                            unsigned int flags)
 190 {
 191         return -EOPNOTSUPP;
 192 }
 193
 194 static inline int __fscrypt_prepare_lookup(struct inode *dir,
 195                                            struct dentry *dentry)
 196 {
 197         return -EOPNOTSUPP;
 198 }
 199
 200 static inline int __fscrypt_prepare_symlink(struct inode *dir,
 201                                             unsigned int len,
 202                                             unsigned int max_len,
 203                                             struct fscrypt_str *disk_link)
 204 {
 205         return -EOPNOTSUPP;
 206 }
 207
 208 static inline int __fscrypt_encrypt_symlink(struct inode *inode,
 209                                             const char *target,
 210                                             unsigned int len,
 211                                             struct fscrypt_str *disk_link)
 212 {
 213         return -EOPNOTSUPP;
 214 }
 215
 216 static inline const char *fscrypt_get_symlink(struct inode *inode,
 217                                               const void *caddr,
 218                                               unsigned int max_size,
 219                                               struct delayed_call *done)
 220 {
 221         return ERR_PTR(-EOPNOTSUPP);
 222 }
 223
 224 #endif  /* _LINUX_FSCRYPT_NOTSUPP_H */