Patch "pNFS: Don't clear the layout stateid if a layout return is outstanding" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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

    pNFS: Don't clear the layout stateid if a layout return is outstanding

to the 4.9-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:
     pnfs-don-t-clear-the-layout-stateid-if-a-layout-return-is-outstanding.patch
and it can be found in the queue-4.9 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 7b650994ab07434ae58a247dc9ac87d2488ca75c Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Mon, 14 Nov 2016 13:10:48 -0500
Subject: pNFS: Don't clear the layout stateid if a layout return is outstanding

From: Trond Myklebust <trond.myklebust@primarydata.com>

commit 7b650994ab07434ae58a247dc9ac87d2488ca75c upstream.

If we no longer hold any layout segments, we're normally expected to
consider the layout stateid to be invalid. However we cannot assume this
if we're about to, or in the process of sending a layoutreturn.

Fixes: 334a8f37115b ("pNFS: Don't forget the layout stateid if...")
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfs/pnfs.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -411,7 +411,9 @@ pnfs_layout_remove_lseg(struct pnfs_layo
 	list_del_init(&lseg->pls_list);
 	/* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */
 	atomic_dec(&lo->plh_refcount);
-	if (list_empty(&lo->plh_segs)) {
+	if (list_empty(&lo->plh_segs) &&
+	    !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
+	    !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) {
 		if (atomic_read(&lo->plh_outstanding) == 0)
 			set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 		clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);


Patches currently in stable-queue which might be from trond.myklebust@primarydata.com are

queue-4.9/pnfs-fix-a-deadlock-between-read-resends-and-layoutreturn.patch
queue-4.9/pnfs-don-t-clear-the-layout-stateid-if-a-layout-return-is-outstanding.patch
queue-4.9/sunrpc-fix-refcounting-problems-with-auth_gss-messages.patch
queue-4.9/pnfs-on-error-do-not-send-layoutget-until-the-layoutreturn-has-completed.patch
queue-4.9/pnfs-clear-nfs_layout_return_requested-when-invalidating-the-layout-stateid.patch