fscrypt: Cleanup fscrypt_{decrypt,encrypt}_page()

- Improve documentation
- Add BUG_ON(len == 0) to avoid accidental switch of offs and len
parameters
- Improve variable names for readability

Signed-off-by: David Gstir <david@sigma-star.at>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/fscrypto.h b/include/linux/fscrypto.h
index 42ef82d60790..2d9abfa22b94 100644
--- a/include/linux/fscrypto.h
+++ b/include/linux/fscrypto.h
@@ -173,9 +173,9 @@ extern struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *, gfp_t);
 extern void fscrypt_release_ctx(struct fscrypt_ctx *);
 extern struct page *fscrypt_encrypt_page(const struct inode *, struct page *,
 						unsigned int, unsigned int,
-						pgoff_t, gfp_t);
+						u64, gfp_t);
 extern int fscrypt_decrypt_page(const struct inode *, struct page *, unsigned int,
-				unsigned int, pgoff_t);
+				unsigned int, u64);
 extern void fscrypt_decrypt_bio_pages(struct fscrypt_ctx *, struct bio *);
 extern void fscrypt_pullback_bio_page(struct page **, bool);
 extern void fscrypt_restore_control_page(struct page *);
@@ -221,14 +221,14 @@ static inline struct page *fscrypt_notsupp_encrypt_page(const struct inode *i,
 						struct page *p,
 						unsigned int len,
 						unsigned int offs,
-						pgoff_t index, gfp_t f)
+						u64 lblk_num, gfp_t f)
 {
 	return ERR_PTR(-EOPNOTSUPP);
 }
 
 static inline int fscrypt_notsupp_decrypt_page(const struct inode *i, struct page *p,
 						unsigned int len, unsigned int offs,
-						pgoff_t index)
+						u64 lblk_num)
 {
 	return -EOPNOTSUPP;
 }