From: Eric Biggers <ebiggers@xxxxxxxxxx>
fscrypt_do_page_crypto() only does a single encryption or decryption
operation, with a single logical block number (single IV). So it
actually operates on a filesystem block, not a "page" per se. To
reflect this, rename it to fscrypt_crypt_block().
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
fs/crypto/bio.c | 6 +++---
fs/crypto/crypto.c | 24 ++++++++++++------------
fs/crypto/fscrypt_private.h | 11 +++++------
3 files changed, 20 insertions(+), 21 deletions(-)
diff --git a/fs/crypto/bio.c b/fs/crypto/bio.c
index 548ec6bb569cf..bcab8822217b0 100644
--- a/fs/crypto/bio.c
+++ b/fs/crypto/bio.c
@@ -84,9 +84,9 @@ int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
return -ENOMEM;
while (len--) {
- err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk,
- ZERO_PAGE(0), ciphertext_page,
- PAGE_SIZE, 0, GFP_NOFS);
+ err = fscrypt_crypt_block(inode, FS_ENCRYPT, lblk,
+ ZERO_PAGE(0), ciphertext_page,
+ PAGE_SIZE, 0, GFP_NOFS);
if (err)
goto errout;
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index ebfa13cfecb7d..e6802d7aca3c7 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -147,10 +147,11 @@ void fscrypt_generate_iv(union fscrypt_iv *iv, u64 lblk_num,
crypto_cipher_encrypt_one(ci->ci_essiv_tfm, iv->raw, iv->raw);
}
-int fscrypt_do_page_crypto(const struct inode *inode, fscrypt_direction_t rw,
- u64 lblk_num, struct page *src_page,
- struct page *dest_page, unsigned int len,
- unsigned int offs, gfp_t gfp_flags)
+/* Encrypt or decrypt a single filesystem block of file contents */
+int fscrypt_crypt_block(const struct inode *inode, fscrypt_direction_t rw,
+ u64 lblk_num, struct page *src_page,
+ struct page *dest_page, unsigned int len,
+ unsigned int offs, gfp_t gfp_flags)
{
union fscrypt_iv iv;
struct skcipher_request *req = NULL;
@@ -227,9 +228,9 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
if (inode->i_sb->s_cop->flags & FS_CFLG_OWN_PAGES) {
/* with inplace-encryption we just encrypt the page */
- err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk_num, page,
- ciphertext_page, len, offs,
- gfp_flags);
+ err = fscrypt_crypt_block(inode, FS_ENCRYPT, lblk_num, page,
+ ciphertext_page, len, offs,
+ gfp_flags);
if (err)
return ERR_PTR(err);
@@ -243,9 +244,8 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
if (!ciphertext_page)
return ERR_PTR(-ENOMEM);
- err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk_num,
- page, ciphertext_page, len, offs,
- gfp_flags);
+ err = fscrypt_crypt_block(inode, FS_ENCRYPT, lblk_num, page,
+ ciphertext_page, len, offs, gfp_flags);
if (err) {
fscrypt_free_bounce_page(ciphertext_page);
return ERR_PTR(err);
@@ -277,8 +277,8 @@ int fscrypt_decrypt_page(const struct inode *inode, struct page *page,
if (!(inode->i_sb->s_cop->flags & FS_CFLG_OWN_PAGES))
BUG_ON(!PageLocked(page));
- return fscrypt_do_page_crypto(inode, FS_DECRYPT, lblk_num, page, page,
- len, offs, GFP_NOFS);
+ return fscrypt_crypt_block(inode, FS_DECRYPT, lblk_num, page, page,
+ len, offs, GFP_NOFS);
}
EXPORT_SYMBOL(fscrypt_decrypt_page);
diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index a5a5486979ff7..8565536feb2b8 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -117,12 +117,11 @@ static inline bool fscrypt_valid_enc_modes(u32 contents_mode,
/* crypto.c */
extern struct kmem_cache *fscrypt_info_cachep;
extern int fscrypt_initialize(unsigned int cop_flags);
-extern int fscrypt_do_page_crypto(const struct inode *inode,
- fscrypt_direction_t rw, u64 lblk_num,
- struct page *src_page,
- struct page *dest_page,
- unsigned int len, unsigned int offs,
- gfp_t gfp_flags);
+extern int fscrypt_crypt_block(const struct inode *inode,
+ fscrypt_direction_t rw, u64 lblk_num,
+ struct page *src_page, struct page *dest_page,
+ unsigned int len, unsigned int offs,
+ gfp_t gfp_flags);
extern struct page *fscrypt_alloc_bounce_page(gfp_t gfp_flags);
extern const struct dentry_operations fscrypt_d_ops;
--
2.21.0.593.g511ec345e18-goog
