Patch "dax: fix vma_is_fsdax() helper" has been added to the 4.14-stable tree

Patch "dax: fix vma_is_fsdax() helper" has been added to the 4.14-stable tree

[gregkh]

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

    dax: fix vma_is_fsdax() helper

to the 4.14-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:
     dax-fix-vma_is_fsdax-helper.patch
and it can be found in the queue-4.14 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 230f5a8969d8345fc9bbe3683f068246cf1be4b8 Mon Sep 17 00:00:00 2001
From: Dan Williams <dan.j.williams@intel.com>
Date: Wed, 21 Feb 2018 17:08:01 -0800
Subject: dax: fix vma_is_fsdax() helper

From: Dan Williams <dan.j.williams@intel.com>

commit 230f5a8969d8345fc9bbe3683f068246cf1be4b8 upstream.

Gerd reports that ->i_mode may contain other bits besides S_IFCHR. Use
S_ISCHR() instead. Otherwise, get_user_pages_longterm() may fail on
device-dax instances when those are meant to be explicitly allowed.

Fixes: 2bb6d2837083 ("mm: introduce get_user_pages_longterm")
Cc: <stable@vger.kernel.org>
Reported-by: Gerd Rausch <gerd.rausch@oracle.com>
Acked-by: Jane Chu <jane.chu@oracle.com>
Reported-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/linux/fs.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3185,7 +3185,7 @@ static inline bool vma_is_fsdax(struct v
 	if (!vma_is_dax(vma))
 		return false;
 	inode = file_inode(vma->vm_file);
-	if (inode->i_mode == S_IFCHR)
+	if (S_ISCHR(inode->i_mode))
 		return false; /* device-dax */
 	return true;
 }


Patches currently in stable-queue which might be from dan.j.williams@intel.com are

queue-4.14/dax-fix-vma_is_fsdax-helper.patch
queue-4.14/vfio-disable-filesystem-dax-page-pinning.patch