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 13/14] fscrypt_zeroout_range: Encrypt all zeroed out blocks of a page
Date: Fri, 12 Apr 2019 22:40:40 +0530 [thread overview]
Message-ID: <20190412171041.31995-14-chandan@linux.ibm.com> (raw)
In-Reply-To: <20190412171041.31995-1-chandan@linux.ibm.com>
For subpage-sized blocks, this commit adds code to encrypt all zeroed
out blocks mapped by a page.
Signed-off-by: Chandan Rajendra <chandan@linux.ibm.com>
---
fs/crypto/bio.c | 40 ++++++++++++++++++----------------------
1 file changed, 18 insertions(+), 22 deletions(-)
diff --git a/fs/crypto/bio.c b/fs/crypto/bio.c
index 83de1e46f546..2c6ce4218fd4 100644
--- a/fs/crypto/bio.c
+++ b/fs/crypto/bio.c
@@ -106,29 +106,23 @@ EXPORT_SYMBOL(fscrypt_pullback_bio_page);
int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
sector_t pblk, unsigned int len)
{
- struct fscrypt_ctx *ctx;
struct page *ciphertext_page = NULL;
struct bio *bio;
+ u64 total_bytes, page_bytes;
int ret, err = 0;
- BUG_ON(inode->i_sb->s_blocksize != PAGE_SIZE);
-
- ctx = fscrypt_get_ctx(inode, GFP_NOFS);
- if (IS_ERR(ctx))
- return PTR_ERR(ctx);
+ total_bytes = len << inode->i_blkbits;
- ciphertext_page = fscrypt_alloc_bounce_page(ctx, GFP_NOWAIT);
- if (IS_ERR(ciphertext_page)) {
- err = PTR_ERR(ciphertext_page);
- goto errout;
- }
+ while (total_bytes) {
+ page_bytes = min_t(u64, total_bytes, PAGE_SIZE);
- while (len--) {
- err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk,
- ZERO_PAGE(0), ciphertext_page,
- PAGE_SIZE, 0, GFP_NOFS);
- if (err)
+ ciphertext_page = fscrypt_encrypt_page(inode, ZERO_PAGE(0),
+ page_bytes, 0, lblk, GFP_NOFS);
+ if (IS_ERR(ciphertext_page)) {
+ err = PTR_ERR(ciphertext_page);
+ ciphertext_page = NULL;
goto errout;
+ }
bio = bio_alloc(GFP_NOWAIT, 1);
if (!bio) {
@@ -139,9 +133,8 @@ int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
bio->bi_iter.bi_sector =
pblk << (inode->i_sb->s_blocksize_bits - 9);
bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
- ret = bio_add_page(bio, ciphertext_page,
- inode->i_sb->s_blocksize, 0);
- if (ret != inode->i_sb->s_blocksize) {
+ ret = bio_add_page(bio, ciphertext_page, page_bytes, 0);
+ if (ret != page_bytes) {
/* should never happen! */
WARN_ON(1);
bio_put(bio);
@@ -154,12 +147,15 @@ int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
bio_put(bio);
if (err)
goto errout;
- lblk++;
- pblk++;
+
+ lblk += page_bytes >> inode->i_blkbits;
+ pblk += page_bytes >> inode->i_blkbits;
+ total_bytes -= page_bytes;
}
err = 0;
errout:
- fscrypt_release_ctx(ctx);
+ if (!IS_ERR_OR_NULL(ciphertext_page))
+ fscrypt_restore_control_page(ciphertext_page);
return err;
}
EXPORT_SYMBOL(fscrypt_zeroout_range);
--
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 ` [RFC PATCH 11/14] fscrypt_encrypt_page: Loop across all blocks mapped by a page range Chandan Rajendra
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 ` Chandan Rajendra [this message]
2019-04-12 17:10 ` [RFC PATCH 14/14] ext4: Enable encryption for subpage-sized blocks Chandan Rajendra
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