From: Chandan Rajendra <chandan@linux.ibm.com>
To: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net,
linux-fscrypt@vger.kernel.org
Cc: Chandan Rajendra <chandan@linux.ibm.com>,
tytso@mit.edu, adilger.kernel@dilger.ca, ebiggers@kernel.org,
jaegeuk@kernel.org, yuchao0@huawei.com
Subject: [RFC PATCH 11/14] fscrypt_encrypt_page: Loop across all blocks mapped by a page range
Date: Fri, 12 Apr 2019 22:40:38 +0530 [thread overview]
Message-ID: <20190412171041.31995-12-chandan@linux.ibm.com> (raw)
In-Reply-To: <20190412171041.31995-1-chandan@linux.ibm.com>
For subpage-sized blocks, this commit now encrypts all blocks mapped by
a page range.
Signed-off-by: Chandan Rajendra <chandan@linux.ibm.com>
---
fs/crypto/crypto.c | 37 +++++++++++++++++++++++++------------
1 file changed, 25 insertions(+), 12 deletions(-)
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index 4f0d832cae71..84d11d8eb7e3 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -242,18 +242,26 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
{
struct fscrypt_ctx *ctx;
struct page *ciphertext_page = page;
+ int i, page_nr_blks;
int err;
BUG_ON(len % FS_CRYPTO_BLOCK_SIZE != 0);
+ page_nr_blks = len >> inode->i_blkbits;
+
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);
- if (err)
- return ERR_PTR(err);
-
+ for (i = 0; i < page_nr_blks; i++) {
+ err = fscrypt_do_page_crypto(inode, FS_ENCRYPT,
+ lblk_num, page,
+ ciphertext_page,
+ i_blocksize(inode), offs,
+ gfp_flags);
+ if (err)
+ return ERR_PTR(err);
+ ++lblk_num;
+ offs += i_blocksize(inode);
+ }
return ciphertext_page;
}
@@ -269,12 +277,17 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
goto errout;
ctx->control_page = page;
- err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk_num,
- page, ciphertext_page, len, offs,
- gfp_flags);
- if (err) {
- ciphertext_page = ERR_PTR(err);
- goto errout;
+
+ for (i = 0; i < page_nr_blks; i++) {
+ err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk_num,
+ page, ciphertext_page, i_blocksize(inode), offs,
+ gfp_flags);
+ if (err) {
+ ciphertext_page = ERR_PTR(err);
+ goto errout;
+ }
+ ++lblk_num;
+ offs += i_blocksize(inode);
}
SetPagePrivate(ciphertext_page);
set_page_private(ciphertext_page, (unsigned long)ctx);
--
2.19.1
next prev parent reply other threads:[~2019-04-12 17:11 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-12 17:10 [RFC PATCH 00/14] Consolidate Post read processing code Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 01/14] ext4: Clear BH_Uptodate flag on decryption error Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 02/14] Consolidate "post read processing" into a new file Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 03/14] fsverity: Add call back to decide if verity check has to be performed Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 04/14] fsverity: Add call back to determine readpage limit Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 05/14] fs/mpage.c: Integrate post read processing Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 06/14] ext4: Wire up ext4_readpage[s] to use mpage_readpage[s] Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 07/14] Remove the term "bio" from post read processing Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 08/14] Add decryption support for sub-pagesized blocks Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 09/14] ext4: Decrypt all boundary blocks when doing buffered write Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 10/14] ext4: Decrypt the block that needs to be partially zeroed Chandan Rajendra
2019-04-12 17:10 ` Chandan Rajendra [this message]
2019-04-12 17:10 ` [RFC PATCH 12/14] ext4: Compute logical block and the page range to be encrypted Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 13/14] fscrypt_zeroout_range: Encrypt all zeroed out blocks of a page Chandan Rajendra
2019-04-12 17:10 ` [RFC PATCH 14/14] ext4: Enable encryption for subpage-sized blocks Chandan Rajendra
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