Patch "pNFS: On error, do not send LAYOUTGET until the LAYOUTRETURN has completed" 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: On error, do not send LAYOUTGET until the LAYOUTRETURN has completed

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-on-error-do-not-send-layoutget-until-the-layoutreturn-has-completed.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 6604b203fb6394ed1f24c21bfa3c207e5ae8e461 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <trond.myklebust@primarydata.com>
Date: Mon, 17 Oct 2016 17:54:32 -0400
Subject: pNFS: On error, do not send LAYOUTGET until the LAYOUTRETURN has completed

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

commit 6604b203fb6394ed1f24c21bfa3c207e5ae8e461 upstream.

If there is an I/O error, we should not call LAYOUTGET until the
LAYOUTRETURN that reports the error is complete.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/nfs/pnfs.c |    6 +++++-
 fs/nfs/pnfs.h |    1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -944,6 +944,7 @@ static void pnfs_clear_layoutcommit(stru
 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo)
 {
 	clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags);
+	clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags);
 	smp_mb__after_atomic();
 	wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
 	rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
@@ -957,8 +958,9 @@ pnfs_prepare_layoutreturn(struct pnfs_la
 	/* Serialise LAYOUTGET/LAYOUTRETURN */
 	if (atomic_read(&lo->plh_outstanding) != 0)
 		return false;
-	if (test_and_set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
+	if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags))
 		return false;
+	set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
 	pnfs_get_layout_hdr(lo);
 	if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) {
 		if (stateid != NULL) {
@@ -1950,6 +1952,8 @@ void pnfs_error_mark_layout_for_return(s
 
 	spin_lock(&inode->i_lock);
 	pnfs_set_plh_return_info(lo, range.iomode, 0);
+	/* Block LAYOUTGET */
+	set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags);
 	/*
 	 * mark all matching lsegs so that we are sure to have no live
 	 * segments at hand when sending layoutreturn. See pnfs_put_lseg()
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -96,6 +96,7 @@ enum {
 	NFS_LAYOUT_RW_FAILED,		/* get rw layout failed stop trying */
 	NFS_LAYOUT_BULK_RECALL,		/* bulk recall affecting layout */
 	NFS_LAYOUT_RETURN,		/* layoutreturn in progress */
+	NFS_LAYOUT_RETURN_LOCK,		/* Serialise layoutreturn */
 	NFS_LAYOUT_RETURN_REQUESTED,	/* Return this layout ASAP */
 	NFS_LAYOUT_INVALID_STID,	/* layout stateid id is invalid */
 	NFS_LAYOUT_FIRST_LAYOUTGET,	/* Serialize first layoutget */


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