linux-ext4 - [RFC PATCH 10/14] ext4: Decrypt the block that needs to be partially zeroed

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Message-Id: <20190412171041.31995-11-chandan@linux.ibm.com>
Date:   Fri, 12 Apr 2019 22:40:37 +0530
From:   Chandan Rajendra <chandan@...ux.ibm.com>
To:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fscrypt@...r.kernel.org
Cc:     Chandan Rajendra <chandan@...ux.ibm.com>, tytso@....edu,
        adilger.kernel@...ger.ca, ebiggers@...nel.org, jaegeuk@...nel.org,
        yuchao0@...wei.com
Subject: [RFC PATCH 10/14] ext4: Decrypt the block that needs to be partially zeroed

__ext4_block_zero_page_range decrypts the entire page. This commit
decrypts the block to be partially zeroed instead of the whole page.

Signed-off-by: Chandan Rajendra <chandan@...ux.ibm.com>
---
 fs/ext4/inode.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 51744a3c3964..ade1816697a8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4080,9 +4080,10 @@ static int __ext4_block_zero_page_range(handle_t *handle,
 		if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode)) {
 			/* We expect the key to be set. */
 			BUG_ON(!fscrypt_has_encryption_key(inode));
-			BUG_ON(blocksize != PAGE_SIZE);
 			WARN_ON_ONCE(fscrypt_decrypt_page(page->mapping->host,
-						page, PAGE_SIZE, 0, page->index));
+							page, blocksize,
+							round_down(offset, blocksize),
+							iblock));
 		}
 	}
 	if (ext4_should_journal_data(inode)) {
-- 
2.19.1