From 76a8f17e0b850d5bb842097b0ee9c2e96af806a0 Mon Sep 17 00:00:00 2001
From: Eric Whitney <enwlinux@gmail.com>
Date: Mon, 29 Aug 2016 15:45:11 -0400
Subject: [PATCH] ext4: enforce online defrag restriction for encrypted files
commit 14fbd4aa613bd5110556c281799ce36dc6f3ba97 upstream.
Online defragging of encrypted files is not currently implemented.
However, the move extent ioctl can still return successfully when
called. For example, this occurs when xfstest ext4/020 is run on an
encrypted file system, resulting in a corrupted test file and a
corresponding test failure.
Until the proper functionality is implemented, fail the move extent
ioctl if either the original or donor file is encrypted.
Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/ext4/move_extent.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 796ff0eafd3c..7861d801b048 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -598,6 +598,13 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
return -EOPNOTSUPP;
}
+ if (ext4_encrypted_inode(orig_inode) ||
+ ext4_encrypted_inode(donor_inode)) {
+ ext4_msg(orig_inode->i_sb, KERN_ERR,
+ "Online defrag not supported for encrypted files");
+ return -EOPNOTSUPP;
+ }
+
/* Protect orig and donor inodes against a truncate */
lock_two_nondirectories(orig_inode, donor_inode);
--
2.34.1