diff options
Diffstat (limited to 'fs/crypto/crypto.c')
| -rw-r--r-- | fs/crypto/crypto.c | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index 98f87fe8f186..f38dc8aac2fe 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -217,8 +217,9 @@ static struct page *alloc_bounce_page(struct fscrypt_ctx *ctx, gfp_t gfp_flags) * @plaintext_page: The page to encrypt. Must be locked. * @gfp_flags: The gfp flag for memory allocation * - * Allocates a ciphertext page and encrypts plaintext_page into it using the ctx - * encryption context. + * Encrypts plaintext_page using the ctx encryption context. If + * the filesystem supports it, encryption is performed in-place, otherwise a + * new ciphertext_page is allocated and returned. * * Called on the page write path. The caller must call * fscrypt_restore_control_page() on the returned ciphertext page to @@ -231,7 +232,7 @@ struct page *fscrypt_encrypt_page(struct inode *inode, struct page *plaintext_page, gfp_t gfp_flags) { struct fscrypt_ctx *ctx; - struct page *ciphertext_page = NULL; + struct page *ciphertext_page = plaintext_page; int err; BUG_ON(!PageLocked(plaintext_page)); @@ -240,10 +241,12 @@ struct page *fscrypt_encrypt_page(struct inode *inode, if (IS_ERR(ctx)) return (struct page *)ctx; - /* The encryption operation will require a bounce page. */ - ciphertext_page = alloc_bounce_page(ctx, gfp_flags); - if (IS_ERR(ciphertext_page)) - goto errout; + if (!(inode->i_sb->s_cop->flags & FS_CFLG_INPLACE_ENCRYPTION)) { + /* The encryption operation will require a bounce page. */ + ciphertext_page = alloc_bounce_page(ctx, gfp_flags); + if (IS_ERR(ciphertext_page)) + goto errout; + } ctx->w.control_page = plaintext_page; err = do_page_crypto(inode, FS_ENCRYPT, plaintext_page->index, @@ -253,9 +256,11 @@ struct page *fscrypt_encrypt_page(struct inode *inode, ciphertext_page = ERR_PTR(err); goto errout; } - SetPagePrivate(ciphertext_page); - set_page_private(ciphertext_page, (unsigned long)ctx); - lock_page(ciphertext_page); + if (!(inode->i_sb->s_cop->flags & FS_CFLG_INPLACE_ENCRYPTION)) { + SetPagePrivate(ciphertext_page); + set_page_private(ciphertext_page, (unsigned long)ctx); + lock_page(ciphertext_page); + } return ciphertext_page; errout: |