Patch "Do not return number of bytes written for ioctl CIFS_IOC_COPYCHUNK_FILE" has been added to the 4.11-stable tree

Patch "Do not return number of bytes written for ioctl CIFS_IOC_COPYCHUNK_FILE" has been added to the 4.11-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Do not return number of bytes written for ioctl CIFS_IOC_COPYCHUNK_FILE

to the 4.11-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     do-not-return-number-of-bytes-written-for-ioctl-cifs_ioc_copychunk_file.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 7d0c234fd2e1c9ca3fa032696c0c58b1b74a9e0b Mon Sep 17 00:00:00 2001
From: Sachin Prabhu <sprabhu@redhat.com>
Date: Wed, 26 Apr 2017 17:10:17 +0100
Subject: Do not return number of bytes written for ioctl CIFS_IOC_COPYCHUNK_FILE

From: Sachin Prabhu <sprabhu@redhat.com>

commit 7d0c234fd2e1c9ca3fa032696c0c58b1b74a9e0b upstream.

commit 620d8745b35d ("Introduce cifs_copy_file_range()") changes the
behaviour of the cifs ioctl call CIFS_IOC_COPYCHUNK_FILE. In case of
successful writes, it now returns the number of bytes written. This
return value is treated as an error by the xfstest cifs/001. Depending
on the errno set at that time, this may or may not result in the test
failing.

The patch fixes this by setting the return value to 0 in case of
successful writes.

Fixes: commit 620d8745b35d ("Introduce cifs_copy_file_range()")
Reported-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/cifs/ioctl.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -74,7 +74,8 @@ static long cifs_ioctl_copychunk(unsigne
 
 	rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
 					src_inode->i_size, 0);
-
+	if (rc > 0)
+		rc = 0;
 out_fput:
 	fdput(src_file);
 out_drop_write:


Patches currently in stable-queue which might be from sprabhu@redhat.com are

queue-4.11/do-not-return-number-of-bytes-written-for-ioctl-cifs_ioc_copychunk_file.patch
queue-4.11/fix-match_prepath.patch