With blocksize < pagesize, a page can contain more than one block. Hence
this commit changes completion_pages() to invoke fscrypt_decrypt_page()
in order to decrypt all the contiguous blocks mapped by the page.
Signed-off-by: Chandan Rajendra <chandan@xxxxxxxxxxxxxxxxxx>
---
fs/crypto/bio.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/fs/crypto/bio.c b/fs/crypto/bio.c
index 0d5e6a5..eb6e06a 100644
--- a/fs/crypto/bio.c
+++ b/fs/crypto/bio.c
@@ -40,8 +40,23 @@ static void completion_pages(struct work_struct *work)
bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;
- int ret = fscrypt_decrypt_page(page->mapping->host, page,
- PAGE_SIZE, 0, page->index);
+ struct inode *inode = page->mapping->host;
+ const unsigned long blocksize = inode->i_sb->s_blocksize;
+ const unsigned blkbits = inode->i_blkbits;
+ int page_blk = page->index << (PAGE_SHIFT - blkbits);
+ int blk = page_blk + (bv->bv_offset >> blkbits);
+ int nr_blks = bv->bv_len >> blkbits;
+ int ret = 0;
+ int j;
+
+ for (j = 0; j < nr_blks; j++, blk++) {
+ ret = fscrypt_decrypt_page(page->mapping->host,
+ page, blocksize,
+ bv->bv_offset + (j << blkbits),
+ blk);
+ if (ret)
+ break;
+ }
if (ret) {
WARN_ON_ONCE(1);
--
2.9.5
