1 /* SPDX-License-Identifier: GPL-2.0 */
3 * fscrypt.h: declarations for per-file encryption
5 * Filesystems that implement per-file encryption must include this header
8 * Copyright (C) 2015, Google, Inc.
10 * Written by Michael Halcrow, 2015.
11 * Modified by Jaegeuk Kim, 2015.
13 #ifndef _LINUX_FSCRYPT_H
14 #define _LINUX_FSCRYPT_H
18 #include <linux/slab.h>
19 #include <uapi/linux/fscrypt.h>
21 #define FS_CRYPTO_BLOCK_SIZE 16
33 const struct qstr *usr_fname;
34 struct fscrypt_str disk_name;
37 struct fscrypt_str crypto_buf;
41 #define FSTR_INIT(n, l) { .name = n, .len = l }
42 #define FSTR_TO_QSTR(f) QSTR_INIT((f)->name, (f)->len)
43 #define fname_name(p) ((p)->disk_name.name)
44 #define fname_len(p) ((p)->disk_name.len)
46 /* Maximum value for the third parameter of fscrypt_operations.set_context(). */
47 #define FSCRYPT_SET_CONTEXT_MAX_SIZE 40
49 #ifdef CONFIG_FS_ENCRYPTION
51 * fscrypt superblock flags
53 #define FS_CFLG_OWN_PAGES (1U << 1)
56 * crypto operations for filesystems
58 struct fscrypt_operations {
60 const char *key_prefix;
61 int (*get_context)(struct inode *inode, void *ctx, size_t len);
62 int (*set_context)(struct inode *inode, const void *ctx, size_t len,
64 const union fscrypt_policy *(*get_dummy_policy)(struct super_block *sb);
65 bool (*empty_dir)(struct inode *inode);
66 unsigned int max_namelen;
67 bool (*has_stable_inodes)(struct super_block *sb);
68 void (*get_ino_and_lblk_bits)(struct super_block *sb,
69 int *ino_bits_ret, int *lblk_bits_ret);
70 int (*get_num_devices)(struct super_block *sb);
71 void (*get_devices)(struct super_block *sb,
72 struct request_queue **devs);
75 static inline struct fscrypt_info *fscrypt_get_info(const struct inode *inode)
78 * Pairs with the cmpxchg_release() in fscrypt_get_encryption_info().
79 * I.e., another task may publish ->i_crypt_info concurrently, executing
80 * a RELEASE barrier. We need to use smp_load_acquire() here to safely
81 * ACQUIRE the memory the other task published.
83 return smp_load_acquire(&inode->i_crypt_info);
87 * fscrypt_needs_contents_encryption() - check whether an inode needs
89 * @inode: the inode to check
91 * Return: %true iff the inode is an encrypted regular file and the kernel was
92 * built with fscrypt support.
94 * If you need to know whether the encrypt bit is set even when the kernel was
95 * built without fscrypt support, you must use IS_ENCRYPTED() directly instead.
97 static inline bool fscrypt_needs_contents_encryption(const struct inode *inode)
99 return IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode);
103 * When d_splice_alias() moves a directory's no-key alias to its plaintext alias
104 * as a result of the encryption key being added, DCACHE_NOKEY_NAME must be
105 * cleared. Note that we don't have to support arbitrary moves of this flag
106 * because fscrypt doesn't allow no-key names to be the source or target of a
109 static inline void fscrypt_handle_d_move(struct dentry *dentry)
111 dentry->d_flags &= ~DCACHE_NOKEY_NAME;
115 * fscrypt_is_nokey_name() - test whether a dentry is a no-key name
116 * @dentry: the dentry to check
118 * This returns true if the dentry is a no-key dentry. A no-key dentry is a
119 * dentry that was created in an encrypted directory that hasn't had its
120 * encryption key added yet. Such dentries may be either positive or negative.
122 * When a filesystem is asked to create a new filename in an encrypted directory
123 * and the new filename's dentry is a no-key dentry, it must fail the operation
124 * with ENOKEY. This includes ->create(), ->mkdir(), ->mknod(), ->symlink(),
125 * ->rename(), and ->link(). (However, ->rename() and ->link() are already
126 * handled by fscrypt_prepare_rename() and fscrypt_prepare_link().)
128 * This is necessary because creating a filename requires the directory's
129 * encryption key, but just checking for the key on the directory inode during
130 * the final filesystem operation doesn't guarantee that the key was available
131 * during the preceding dentry lookup. And the key must have already been
132 * available during the dentry lookup in order for it to have been checked
133 * whether the filename already exists in the directory and for the new file's
134 * dentry not to be invalidated due to it incorrectly having the no-key flag.
136 * Return: %true if the dentry is a no-key name
138 static inline bool fscrypt_is_nokey_name(const struct dentry *dentry)
140 return dentry->d_flags & DCACHE_NOKEY_NAME;
144 void fscrypt_enqueue_decrypt_work(struct work_struct *);
146 struct page *fscrypt_encrypt_pagecache_blocks(struct page *page,
150 int fscrypt_encrypt_block_inplace(const struct inode *inode, struct page *page,
151 unsigned int len, unsigned int offs,
152 u64 lblk_num, gfp_t gfp_flags);
154 int fscrypt_decrypt_pagecache_blocks(struct page *page, unsigned int len,
156 int fscrypt_decrypt_block_inplace(const struct inode *inode, struct page *page,
157 unsigned int len, unsigned int offs,
160 static inline bool fscrypt_is_bounce_page(struct page *page)
162 return page->mapping == NULL;
165 static inline struct page *fscrypt_pagecache_page(struct page *bounce_page)
167 return (struct page *)page_private(bounce_page);
170 void fscrypt_free_bounce_page(struct page *bounce_page);
173 int fscrypt_ioctl_set_policy(struct file *filp, const void __user *arg);
174 int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg);
175 int fscrypt_ioctl_get_policy_ex(struct file *filp, void __user *arg);
176 int fscrypt_ioctl_get_nonce(struct file *filp, void __user *arg);
177 int fscrypt_has_permitted_context(struct inode *parent, struct inode *child);
178 int fscrypt_set_context(struct inode *inode, void *fs_data);
180 struct fscrypt_dummy_policy {
181 const union fscrypt_policy *policy;
184 int fscrypt_set_test_dummy_encryption(struct super_block *sb, const char *arg,
185 struct fscrypt_dummy_policy *dummy_policy);
186 void fscrypt_show_test_dummy_encryption(struct seq_file *seq, char sep,
187 struct super_block *sb);
189 fscrypt_free_dummy_policy(struct fscrypt_dummy_policy *dummy_policy)
191 kfree(dummy_policy->policy);
192 dummy_policy->policy = NULL;
196 void fscrypt_destroy_keyring(struct super_block *sb);
197 int fscrypt_ioctl_add_key(struct file *filp, void __user *arg);
198 int fscrypt_ioctl_remove_key(struct file *filp, void __user *arg);
199 int fscrypt_ioctl_remove_key_all_users(struct file *filp, void __user *arg);
200 int fscrypt_ioctl_get_key_status(struct file *filp, void __user *arg);
203 int fscrypt_get_encryption_info(struct inode *inode);
204 int fscrypt_prepare_new_inode(struct inode *dir, struct inode *inode,
206 void fscrypt_put_encryption_info(struct inode *inode);
207 void fscrypt_free_inode(struct inode *inode);
208 int fscrypt_drop_inode(struct inode *inode);
211 int fscrypt_setup_filename(struct inode *inode, const struct qstr *iname,
212 int lookup, struct fscrypt_name *fname);
214 static inline void fscrypt_free_filename(struct fscrypt_name *fname)
216 kfree(fname->crypto_buf.name);
219 int fscrypt_fname_alloc_buffer(u32 max_encrypted_len,
220 struct fscrypt_str *crypto_str);
221 void fscrypt_fname_free_buffer(struct fscrypt_str *crypto_str);
222 int fscrypt_fname_disk_to_usr(const struct inode *inode,
223 u32 hash, u32 minor_hash,
224 const struct fscrypt_str *iname,
225 struct fscrypt_str *oname);
226 bool fscrypt_match_name(const struct fscrypt_name *fname,
227 const u8 *de_name, u32 de_name_len);
228 u64 fscrypt_fname_siphash(const struct inode *dir, const struct qstr *name);
229 int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags);
232 void fscrypt_decrypt_bio(struct bio *bio);
233 int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
234 sector_t pblk, unsigned int len);
237 int fscrypt_file_open(struct inode *inode, struct file *filp);
238 int __fscrypt_prepare_link(struct inode *inode, struct inode *dir,
239 struct dentry *dentry);
240 int __fscrypt_prepare_rename(struct inode *old_dir, struct dentry *old_dentry,
241 struct inode *new_dir, struct dentry *new_dentry,
243 int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry,
244 struct fscrypt_name *fname);
245 int fscrypt_prepare_setflags(struct inode *inode,
246 unsigned int oldflags, unsigned int flags);
247 int fscrypt_prepare_symlink(struct inode *dir, const char *target,
248 unsigned int len, unsigned int max_len,
249 struct fscrypt_str *disk_link);
250 int __fscrypt_encrypt_symlink(struct inode *inode, const char *target,
251 unsigned int len, struct fscrypt_str *disk_link);
252 const char *fscrypt_get_symlink(struct inode *inode, const void *caddr,
253 unsigned int max_size,
254 struct delayed_call *done);
255 int fscrypt_symlink_getattr(const struct path *path, struct kstat *stat);
256 static inline void fscrypt_set_ops(struct super_block *sb,
257 const struct fscrypt_operations *s_cop)
261 #else /* !CONFIG_FS_ENCRYPTION */
263 static inline struct fscrypt_info *fscrypt_get_info(const struct inode *inode)
268 static inline bool fscrypt_needs_contents_encryption(const struct inode *inode)
273 static inline void fscrypt_handle_d_move(struct dentry *dentry)
277 static inline bool fscrypt_is_nokey_name(const struct dentry *dentry)
283 static inline void fscrypt_enqueue_decrypt_work(struct work_struct *work)
287 static inline struct page *fscrypt_encrypt_pagecache_blocks(struct page *page,
292 return ERR_PTR(-EOPNOTSUPP);
295 static inline int fscrypt_encrypt_block_inplace(const struct inode *inode,
298 unsigned int offs, u64 lblk_num,
304 static inline int fscrypt_decrypt_pagecache_blocks(struct page *page,
311 static inline int fscrypt_decrypt_block_inplace(const struct inode *inode,
314 unsigned int offs, u64 lblk_num)
319 static inline bool fscrypt_is_bounce_page(struct page *page)
324 static inline struct page *fscrypt_pagecache_page(struct page *bounce_page)
327 return ERR_PTR(-EINVAL);
330 static inline void fscrypt_free_bounce_page(struct page *bounce_page)
335 static inline int fscrypt_ioctl_set_policy(struct file *filp,
336 const void __user *arg)
341 static inline int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg)
346 static inline int fscrypt_ioctl_get_policy_ex(struct file *filp,
352 static inline int fscrypt_ioctl_get_nonce(struct file *filp, void __user *arg)
357 static inline int fscrypt_has_permitted_context(struct inode *parent,
363 static inline int fscrypt_set_context(struct inode *inode, void *fs_data)
368 struct fscrypt_dummy_policy {
371 static inline void fscrypt_show_test_dummy_encryption(struct seq_file *seq,
373 struct super_block *sb)
378 fscrypt_free_dummy_policy(struct fscrypt_dummy_policy *dummy_policy)
383 static inline void fscrypt_destroy_keyring(struct super_block *sb)
387 static inline int fscrypt_ioctl_add_key(struct file *filp, void __user *arg)
392 static inline int fscrypt_ioctl_remove_key(struct file *filp, void __user *arg)
397 static inline int fscrypt_ioctl_remove_key_all_users(struct file *filp,
403 static inline int fscrypt_ioctl_get_key_status(struct file *filp,
410 static inline int fscrypt_get_encryption_info(struct inode *inode)
415 static inline int fscrypt_prepare_new_inode(struct inode *dir,
419 if (IS_ENCRYPTED(dir))
424 static inline void fscrypt_put_encryption_info(struct inode *inode)
429 static inline void fscrypt_free_inode(struct inode *inode)
433 static inline int fscrypt_drop_inode(struct inode *inode)
439 static inline int fscrypt_setup_filename(struct inode *dir,
440 const struct qstr *iname,
441 int lookup, struct fscrypt_name *fname)
443 if (IS_ENCRYPTED(dir))
446 memset(fname, 0, sizeof(*fname));
447 fname->usr_fname = iname;
448 fname->disk_name.name = (unsigned char *)iname->name;
449 fname->disk_name.len = iname->len;
453 static inline void fscrypt_free_filename(struct fscrypt_name *fname)
458 static inline int fscrypt_fname_alloc_buffer(u32 max_encrypted_len,
459 struct fscrypt_str *crypto_str)
464 static inline void fscrypt_fname_free_buffer(struct fscrypt_str *crypto_str)
469 static inline int fscrypt_fname_disk_to_usr(const struct inode *inode,
470 u32 hash, u32 minor_hash,
471 const struct fscrypt_str *iname,
472 struct fscrypt_str *oname)
477 static inline bool fscrypt_match_name(const struct fscrypt_name *fname,
478 const u8 *de_name, u32 de_name_len)
480 /* Encryption support disabled; use standard comparison */
481 if (de_name_len != fname->disk_name.len)
483 return !memcmp(de_name, fname->disk_name.name, fname->disk_name.len);
486 static inline u64 fscrypt_fname_siphash(const struct inode *dir,
487 const struct qstr *name)
493 static inline int fscrypt_d_revalidate(struct dentry *dentry,
500 static inline void fscrypt_decrypt_bio(struct bio *bio)
504 static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
505 sector_t pblk, unsigned int len)
512 static inline int fscrypt_file_open(struct inode *inode, struct file *filp)
514 if (IS_ENCRYPTED(inode))
519 static inline int __fscrypt_prepare_link(struct inode *inode, struct inode *dir,
520 struct dentry *dentry)
525 static inline int __fscrypt_prepare_rename(struct inode *old_dir,
526 struct dentry *old_dentry,
527 struct inode *new_dir,
528 struct dentry *new_dentry,
534 static inline int __fscrypt_prepare_lookup(struct inode *dir,
535 struct dentry *dentry,
536 struct fscrypt_name *fname)
541 static inline int fscrypt_prepare_setflags(struct inode *inode,
542 unsigned int oldflags,
548 static inline int fscrypt_prepare_symlink(struct inode *dir,
551 unsigned int max_len,
552 struct fscrypt_str *disk_link)
554 if (IS_ENCRYPTED(dir))
556 disk_link->name = (unsigned char *)target;
557 disk_link->len = len + 1;
558 if (disk_link->len > max_len)
559 return -ENAMETOOLONG;
563 static inline int __fscrypt_encrypt_symlink(struct inode *inode,
566 struct fscrypt_str *disk_link)
571 static inline const char *fscrypt_get_symlink(struct inode *inode,
573 unsigned int max_size,
574 struct delayed_call *done)
576 return ERR_PTR(-EOPNOTSUPP);
579 static inline int fscrypt_symlink_getattr(const struct path *path,
585 static inline void fscrypt_set_ops(struct super_block *sb,
586 const struct fscrypt_operations *s_cop)
590 #endif /* !CONFIG_FS_ENCRYPTION */
593 #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT
595 bool __fscrypt_inode_uses_inline_crypto(const struct inode *inode);
597 void fscrypt_set_bio_crypt_ctx(struct bio *bio,
598 const struct inode *inode, u64 first_lblk,
601 void fscrypt_set_bio_crypt_ctx_bh(struct bio *bio,
602 const struct buffer_head *first_bh,
605 bool fscrypt_mergeable_bio(struct bio *bio, const struct inode *inode,
608 bool fscrypt_mergeable_bio_bh(struct bio *bio,
609 const struct buffer_head *next_bh);
611 #else /* CONFIG_FS_ENCRYPTION_INLINE_CRYPT */
613 static inline bool __fscrypt_inode_uses_inline_crypto(const struct inode *inode)
618 static inline void fscrypt_set_bio_crypt_ctx(struct bio *bio,
619 const struct inode *inode,
620 u64 first_lblk, gfp_t gfp_mask) { }
622 static inline void fscrypt_set_bio_crypt_ctx_bh(
624 const struct buffer_head *first_bh,
627 static inline bool fscrypt_mergeable_bio(struct bio *bio,
628 const struct inode *inode,
634 static inline bool fscrypt_mergeable_bio_bh(struct bio *bio,
635 const struct buffer_head *next_bh)
639 #endif /* !CONFIG_FS_ENCRYPTION_INLINE_CRYPT */
642 * fscrypt_inode_uses_inline_crypto() - test whether an inode uses inline
644 * @inode: an inode. If encrypted, its key must be set up.
646 * Return: true if the inode requires file contents encryption and if the
647 * encryption should be done in the block layer via blk-crypto rather
648 * than in the filesystem layer.
650 static inline bool fscrypt_inode_uses_inline_crypto(const struct inode *inode)
652 return fscrypt_needs_contents_encryption(inode) &&
653 __fscrypt_inode_uses_inline_crypto(inode);
657 * fscrypt_inode_uses_fs_layer_crypto() - test whether an inode uses fs-layer
659 * @inode: an inode. If encrypted, its key must be set up.
661 * Return: true if the inode requires file contents encryption and if the
662 * encryption should be done in the filesystem layer rather than in the
663 * block layer via blk-crypto.
665 static inline bool fscrypt_inode_uses_fs_layer_crypto(const struct inode *inode)
667 return fscrypt_needs_contents_encryption(inode) &&
668 !__fscrypt_inode_uses_inline_crypto(inode);
672 * fscrypt_has_encryption_key() - check whether an inode has had its key set up
673 * @inode: the inode to check
675 * Return: %true if the inode has had its encryption key set up, else %false.
677 * Usually this should be preceded by fscrypt_get_encryption_info() to try to
678 * set up the key first.
680 static inline bool fscrypt_has_encryption_key(const struct inode *inode)
682 return fscrypt_get_info(inode) != NULL;
686 * fscrypt_require_key() - require an inode's encryption key
687 * @inode: the inode we need the key for
689 * If the inode is encrypted, set up its encryption key if not already done.
690 * Then require that the key be present and return -ENOKEY otherwise.
692 * No locks are needed, and the key will live as long as the struct inode --- so
693 * it won't go away from under you.
695 * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code
696 * if a problem occurred while setting up the encryption key.
698 static inline int fscrypt_require_key(struct inode *inode)
700 if (IS_ENCRYPTED(inode)) {
701 int err = fscrypt_get_encryption_info(inode);
705 if (!fscrypt_has_encryption_key(inode))
712 * fscrypt_prepare_link() - prepare to link an inode into a possibly-encrypted
714 * @old_dentry: an existing dentry for the inode being linked
715 * @dir: the target directory
716 * @dentry: negative dentry for the target filename
718 * A new link can only be added to an encrypted directory if the directory's
719 * encryption key is available --- since otherwise we'd have no way to encrypt
720 * the filename. Therefore, we first set up the directory's encryption key (if
721 * not already done) and return an error if it's unavailable.
723 * We also verify that the link will not violate the constraint that all files
724 * in an encrypted directory tree use the same encryption policy.
726 * Return: 0 on success, -ENOKEY if the directory's encryption key is missing,
727 * -EXDEV if the link would result in an inconsistent encryption policy, or
728 * another -errno code.
730 static inline int fscrypt_prepare_link(struct dentry *old_dentry,
732 struct dentry *dentry)
734 if (IS_ENCRYPTED(dir))
735 return __fscrypt_prepare_link(d_inode(old_dentry), dir, dentry);
740 * fscrypt_prepare_rename() - prepare for a rename between possibly-encrypted
742 * @old_dir: source directory
743 * @old_dentry: dentry for source file
744 * @new_dir: target directory
745 * @new_dentry: dentry for target location (may be negative unless exchanging)
746 * @flags: rename flags (we care at least about %RENAME_EXCHANGE)
748 * Prepare for ->rename() where the source and/or target directories may be
749 * encrypted. A new link can only be added to an encrypted directory if the
750 * directory's encryption key is available --- since otherwise we'd have no way
751 * to encrypt the filename. A rename to an existing name, on the other hand,
752 * *is* cryptographically possible without the key. However, we take the more
753 * conservative approach and just forbid all no-key renames.
755 * We also verify that the rename will not violate the constraint that all files
756 * in an encrypted directory tree use the same encryption policy.
758 * Return: 0 on success, -ENOKEY if an encryption key is missing, -EXDEV if the
759 * rename would cause inconsistent encryption policies, or another -errno code.
761 static inline int fscrypt_prepare_rename(struct inode *old_dir,
762 struct dentry *old_dentry,
763 struct inode *new_dir,
764 struct dentry *new_dentry,
767 if (IS_ENCRYPTED(old_dir) || IS_ENCRYPTED(new_dir))
768 return __fscrypt_prepare_rename(old_dir, old_dentry,
769 new_dir, new_dentry, flags);
774 * fscrypt_prepare_lookup() - prepare to lookup a name in a possibly-encrypted
776 * @dir: directory being searched
777 * @dentry: filename being looked up
778 * @fname: (output) the name to use to search the on-disk directory
780 * Prepare for ->lookup() in a directory which may be encrypted by determining
781 * the name that will actually be used to search the directory on-disk. If the
782 * directory's encryption key is available, then the lookup is assumed to be by
783 * plaintext name; otherwise, it is assumed to be by no-key name.
785 * This also installs a custom ->d_revalidate() method which will invalidate the
786 * dentry if it was created without the key and the key is later added.
788 * Return: 0 on success; -ENOENT if the directory's key is unavailable but the
789 * filename isn't a valid no-key name, so a negative dentry should be created;
790 * or another -errno code.
792 static inline int fscrypt_prepare_lookup(struct inode *dir,
793 struct dentry *dentry,
794 struct fscrypt_name *fname)
796 if (IS_ENCRYPTED(dir))
797 return __fscrypt_prepare_lookup(dir, dentry, fname);
799 memset(fname, 0, sizeof(*fname));
800 fname->usr_fname = &dentry->d_name;
801 fname->disk_name.name = (unsigned char *)dentry->d_name.name;
802 fname->disk_name.len = dentry->d_name.len;
807 * fscrypt_prepare_setattr() - prepare to change a possibly-encrypted inode's
809 * @dentry: dentry through which the inode is being changed
810 * @attr: attributes to change
812 * Prepare for ->setattr() on a possibly-encrypted inode. On an encrypted file,
813 * most attribute changes are allowed even without the encryption key. However,
814 * without the encryption key we do have to forbid truncates. This is needed
815 * because the size being truncated to may not be a multiple of the filesystem
816 * block size, and in that case we'd have to decrypt the final block, zero the
817 * portion past i_size, and re-encrypt it. (We *could* allow truncating to a
818 * filesystem block boundary, but it's simpler to just forbid all truncates ---
819 * and we already forbid all other contents modifications without the key.)
821 * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code
822 * if a problem occurred while setting up the encryption key.
824 static inline int fscrypt_prepare_setattr(struct dentry *dentry,
827 if (attr->ia_valid & ATTR_SIZE)
828 return fscrypt_require_key(d_inode(dentry));
833 * fscrypt_encrypt_symlink() - encrypt the symlink target if needed
834 * @inode: symlink inode
835 * @target: plaintext symlink target
836 * @len: length of @target excluding null terminator
837 * @disk_link: (in/out) the on-disk symlink target being prepared
839 * If the symlink target needs to be encrypted, then this function encrypts it
840 * into @disk_link->name. fscrypt_prepare_symlink() must have been called
841 * previously to compute @disk_link->len. If the filesystem did not allocate a
842 * buffer for @disk_link->name after calling fscrypt_prepare_link(), then one
843 * will be kmalloc()'ed and the filesystem will be responsible for freeing it.
845 * Return: 0 on success, -errno on failure
847 static inline int fscrypt_encrypt_symlink(struct inode *inode,
850 struct fscrypt_str *disk_link)
852 if (IS_ENCRYPTED(inode))
853 return __fscrypt_encrypt_symlink(inode, target, len, disk_link);
857 /* If *pagep is a bounce page, free it and set *pagep to the pagecache page */
858 static inline void fscrypt_finalize_bounce_page(struct page **pagep)
860 struct page *page = *pagep;
862 if (fscrypt_is_bounce_page(page)) {
863 *pagep = fscrypt_pagecache_page(page);
864 fscrypt_free_bounce_page(page);
868 #endif /* _LINUX_FSCRYPT_H */