[RFC PATCH V2 01/11] ext4: Clear BH_Uptodate flag on decryption error

[Chandan Rajendra <chandan@linux.vnet.ibm.com>]

On an error return from fscrypt_decrypt_page(), ext4_block_write_begin()
can return with the page's buffer_head marked with BH_Uptodate
flag. This commit clears the BH_Uptodate flag in such cases.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
 fs/ext4/inode.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 6f6589e..e8ecf67 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1231,9 +1231,13 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
 	}
 	if (unlikely(err))
 		page_zero_new_buffers(page, from, to);
-	else if (decrypt)
+	else if (decrypt) {
 		err = fscrypt_decrypt_page(page->mapping->host, page,
 				PAGE_SIZE, 0, page->index);
+		if (err)
+			clear_buffer_uptodate(*wait_bh);
+	}
+
 	return err;
 }
 #endif
-- 
2.9.5