diff options
Diffstat (limited to 'fs/crypto/crypto.c')
| -rw-r--r-- | fs/crypto/crypto.c | 50 |
1 files changed, 31 insertions, 19 deletions
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index 59337287e580..2969a1dff10b 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -200,8 +200,7 @@ int fscrypt_crypt_block(const struct inode *inode, fscrypt_direction_t rw, /** * fscypt_encrypt_page() - Encrypts a page * @inode: The inode for which the encryption should take place - * @page: The page to encrypt. Must be locked for bounce-page - * encryption. + * @page: The page to encrypt. Must be locked. * @len: Length of data to encrypt in @page and encrypted * data in returned page. * @offs: Offset of data within @page and returned @@ -211,10 +210,9 @@ int fscrypt_crypt_block(const struct inode *inode, fscrypt_direction_t rw, * previously written data. * @gfp_flags: The gfp flag for memory allocation * - * Encrypts @page. If the filesystem set FS_CFLG_OWN_PAGES, then the data is - * encrypted in-place and @page is returned. Else, a bounce page is allocated, - * the data is encrypted into the bounce page, and the bounce page is returned. - * The caller is responsible for calling fscrypt_free_bounce_page(). + * Encrypts @page. A bounce page is allocated, the data is encrypted into the + * bounce page, and the bounce page is returned. The caller is responsible for + * calling fscrypt_free_bounce_page(). * * Return: A page containing the encrypted data on success, else an ERR_PTR() */ @@ -225,24 +223,12 @@ struct page *fscrypt_encrypt_page(const struct inode *inode, u64 lblk_num, gfp_t gfp_flags) { - struct page *ciphertext_page = page; + struct page *ciphertext_page; int err; - if (inode->i_sb->s_cop->flags & FS_CFLG_OWN_PAGES) { - /* with inplace-encryption we just encrypt the page */ - err = fscrypt_crypt_block(inode, FS_ENCRYPT, lblk_num, page, - ciphertext_page, len, offs, - gfp_flags); - if (err) - return ERR_PTR(err); - - return ciphertext_page; - } - if (WARN_ON_ONCE(!PageLocked(page))) return ERR_PTR(-EINVAL); - /* The encryption operation will require a bounce page. */ ciphertext_page = fscrypt_alloc_bounce_page(gfp_flags); if (!ciphertext_page) return ERR_PTR(-ENOMEM); @@ -260,6 +246,32 @@ struct page *fscrypt_encrypt_page(const struct inode *inode, EXPORT_SYMBOL(fscrypt_encrypt_page); /** + * fscrypt_encrypt_block_inplace() - Encrypt a filesystem block in-place + * @inode: The inode to which this block belongs + * @page: The page containing the block to encrypt + * @len: Size of block to encrypt. Doesn't need to be a multiple of the + * fs block size, but must be a multiple of FS_CRYPTO_BLOCK_SIZE. + * @offs: Byte offset within @page at which the block to encrypt begins + * @lblk_num: Filesystem logical block number of the block, i.e. the 0-based + * number of the block within the file + * @gfp_flags: Memory allocation flags + * + * Encrypt a possibly-compressed filesystem block that is located in an + * arbitrary page, not necessarily in the original pagecache page. The @inode + * and @lblk_num must be specified, as they can't be determined from @page. + * + * Return: 0 on success; -errno on failure + */ +int fscrypt_encrypt_block_inplace(const struct inode *inode, struct page *page, + unsigned int len, unsigned int offs, + u64 lblk_num, gfp_t gfp_flags) +{ + return fscrypt_crypt_block(inode, FS_ENCRYPT, lblk_num, page, page, + len, offs, gfp_flags); +} +EXPORT_SYMBOL(fscrypt_encrypt_block_inplace); + +/** * fscrypt_decrypt_page() - Decrypts a page in-place * @inode: The corresponding inode for the page to decrypt. * @page: The page to decrypt. Must be locked in case |