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authorEric Biggers <ebiggers@google.com>2019-05-20 09:29:48 -0700
committerEric Biggers <ebiggers@google.com>2019-05-28 10:27:53 -0700
commitffceeefb337b3ba9da36633072490caa96289345 (patch)
tree0849a49406848038682382fabe20684ff0cccdd2 /fs/crypto
parentaa8bc1ac6ef32a332671ca25e06cfd277a3839a5 (diff)
fscrypt: decrypt only the needed blocks in __fscrypt_decrypt_bio()
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>
Diffstat (limited to 'fs/crypto')
-rw-r--r--fs/crypto/bio.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/crypto/bio.c b/fs/crypto/bio.c
index 61da06fda45c..82da2510721f 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)