On BLOCKSIZE < PAGE SIZE systems, a page maps more than one filesystem
block. This commit changes fscrypt_decrypt_page() to iterate across and
decrypt all the blocks mapped by a page.
Signed-off-by: Chandan Rajendra <chandan@xxxxxxxxxxxxxxxxxx>
---
fs/crypto/crypto.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index fac445d..27509b1 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -305,11 +305,24 @@ EXPORT_SYMBOL(fscrypt_encrypt_page);
int fscrypt_decrypt_page(const struct inode *inode, struct page *page,
unsigned int len, unsigned int offs, u64 lblk_num)
{
+ unsigned long blocksize = inode->i_sb->s_blocksize;
+ unsigned int last = offs + len;
+ int ret;
+
if (!(inode->i_sb->s_cop->flags & FS_CFLG_OWN_PAGES))
BUG_ON(!PageLocked(page));
- return fscrypt_do_block_crypto(inode, FS_DECRYPT, lblk_num, page, page,
- len, offs, GFP_NOFS);
+ while (offs < last) {
+ ret = fscrypt_do_block_crypto(inode, FS_DECRYPT, lblk_num, page,
+ page, blocksize, offs, GFP_NOFS);
+ if (ret)
+ return ret;
+
+ offs += blocksize;
+ ++lblk_num;
+ }
+
+ return 0;
}
EXPORT_SYMBOL(fscrypt_decrypt_page);
--
2.9.5
