From: Daniel Rosenberg <drosen@google.com>
Date: Fri, 10 Mar 2017 05:24:58 +0000 (-0800)
Subject: ANDROID: sdcardfs: copy lower inode attributes in ->ioctl
X-Git-Tag: release-20171130_firefly~4^2~100^2~156
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2c852b7279a7a406631d671a9ede48420fb1e85f;p=firefly-linux-kernel-4.4.55.git

ANDROID: sdcardfs: copy lower inode attributes in ->ioctl

Adapted from wrapfs
commit fbc9c6f83ea6 ("Wrapfs: copy lower inode attributes in ->ioctl")
commit e97d8e26cc9e ("Wrapfs: use file_inode helper")

Some ioctls (e.g., EXT2_IOC_SETFLAGS) can change inode attributes, so copy
them from lower inode.

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Bug: 35766959
Change-Id: I0f12684b9dbd4088b4a622c7ea9c03087f40e572
---

diff --git a/fs/sdcardfs/file.c b/fs/sdcardfs/file.c
index 7e2c50b30782..41a550fec3f2 100644
--- a/fs/sdcardfs/file.c
+++ b/fs/sdcardfs/file.c
@@ -113,6 +113,10 @@ static long sdcardfs_unlocked_ioctl(struct file *file, unsigned int cmd,
 	if (lower_file->f_op->unlocked_ioctl)
 		err = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
 
+	/* some ioctls can change inode attributes (EXT2_IOC_SETFLAGS) */
+	if (!err)
+		sdcardfs_copy_and_fix_attrs(file_inode(file),
+				      file_inode(lower_file));
 out:
 	return err;
 }