From: Eric Biggers <ebiggers@kernel.org>
To: linux-fscrypt@vger.kernel.org
Cc: linux-ext4@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net,
linux-mtd@lists.infradead.org,
Chandan Rajendra <chandan@linux.ibm.com>
Subject: [PATCH v2 10/14] fscrypt: decrypt only the needed blocks in __fscrypt_decrypt_bio()
Date: Mon, 20 May 2019 09:29:48 -0700 [thread overview]
Message-ID: <20190520162952.156212-11-ebiggers@kernel.org> (raw)
In-Reply-To: <20190520162952.156212-1-ebiggers@kernel.org>
From: Eric Biggers <ebiggers@google.com>
In __fscrypt_decrypt_bio(), only decrypt the blocks that actually
comprise the bio, rather than assuming blocksize == PAGE_SIZE and
decrypting the entirety of every page used in the bio.
This is in preparation for allowing encryption on ext4 filesystems with
blocksize != PAGE_SIZE.
This is based on work by Chandan Rajendra.
Reviewed-by: Chandan Rajendra <chandan@linux.ibm.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
fs/crypto/bio.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/crypto/bio.c b/fs/crypto/bio.c
index 61da06fda45cc..82da2510721f6 100644
--- a/fs/crypto/bio.c
+++ b/fs/crypto/bio.c
@@ -33,8 +33,8 @@ static void __fscrypt_decrypt_bio(struct bio *bio, bool done)
bio_for_each_segment_all(bv, bio, iter_all) {
struct page *page = bv->bv_page;
- int ret = fscrypt_decrypt_pagecache_blocks(page, PAGE_SIZE, 0);
-
+ int ret = fscrypt_decrypt_pagecache_blocks(page, bv->bv_len,
+ bv->bv_offset);
if (ret)
SetPageError(page);
else if (done)
--
2.21.0.1020.gf2820cf01a-goog
next prev parent reply other threads:[~2019-05-20 16:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-20 16:29 [PATCH v2 00/14] fscrypt, ext4: prepare for blocksize != PAGE_SIZE Eric Biggers
2019-05-20 16:29 ` [PATCH v2 01/14] fscrypt: simplify bounce page handling Eric Biggers
2019-05-20 16:29 ` [PATCH v2 02/14] fscrypt: remove the "write" part of struct fscrypt_ctx Eric Biggers
2019-05-20 16:29 ` [PATCH v2 03/14] fscrypt: rename fscrypt_do_page_crypto() to fscrypt_crypt_block() Eric Biggers
2019-05-20 16:29 ` [PATCH v2 04/14] fscrypt: clean up some BUG_ON()s in block encryption/decryption Eric Biggers
2019-05-20 16:29 ` [PATCH v2 05/14] fscrypt: introduce fscrypt_encrypt_block_inplace() Eric Biggers
2019-05-20 16:29 ` [PATCH v2 06/14] fscrypt: support encrypting multiple filesystem blocks per page Eric Biggers
2019-05-20 16:29 ` [PATCH v2 07/14] fscrypt: handle blocksize < PAGE_SIZE in fscrypt_zeroout_range() Eric Biggers
2019-05-20 16:29 ` [PATCH v2 08/14] fscrypt: introduce fscrypt_decrypt_block_inplace() Eric Biggers
2019-05-20 16:29 ` [PATCH v2 09/14] fscrypt: support decrypting multiple filesystem blocks per page Eric Biggers
2019-05-20 16:29 ` Eric Biggers [this message]
2019-05-20 16:29 ` [PATCH v2 11/14] ext4: clear BH_Uptodate flag on decryption error Eric Biggers
2019-05-20 16:29 ` [PATCH v2 12/14] ext4: decrypt only the needed blocks in ext4_block_write_begin() Eric Biggers
2019-05-20 16:29 ` [PATCH v2 13/14] ext4: decrypt only the needed block in __ext4_block_zero_page_range() Eric Biggers
2019-05-20 16:29 ` [PATCH v2 14/14] ext4: encrypt only up to last block in ext4_bio_write_page() Eric Biggers
2019-05-29 20:47 ` [PATCH v2 00/14] fscrypt, ext4: prepare for blocksize != PAGE_SIZE Eric Biggers
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