Re: FAILED: patch "[PATCH] dax: Check page->mapping isn't NULL" failed to apply to 4.19-stable tree

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Dec 11, 2018 at 07:22:41AM -0800, Matthew Wilcox wrote:
> On Tue, Dec 11, 2018 at 03:00:15PM +0100, gregkh@linuxfoundation.org wrote:
> > The patch below does not apply to the 4.19-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
> 
> 
> >From ebcfdf7933e1c72dbe581e64064bc6b8bb5d8694 Mon Sep 17 00:00:00 2001
> From: Matthew Wilcox <willy@infradead.org>
> Date: Tue, 11 Dec 2018 09:41:48 -0500
> Subject: [PATCH 1/2] dax: Check page->mapping isn't NULL
> 
> commit c93db7bb6ef3251e0ea48ade311d3e9942748e1c upstream.
> 
> If we race with inode destroy, it's possible for page->mapping to be
> NULL before we even enter this routine, as well as after having slept
> waiting for the dax entry to become unlocked.
> 
> Fixes: c2a7d2a11552 ("filesystem-dax: Introduce dax_lock_mapping_entry()")
> Cc: <stable@vger.kernel.org>
> Reported-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Matthew Wilcox <willy@infradead.org>
> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
> Reviewed-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
>  fs/dax.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Now applied, thanks.

greg k-h