Patch "nfs41: do not return ENOMEM on LAYOUTUNAVAILABLE" has been added to the 4.14-stable tree

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

nfs41: do not return ENOMEM on LAYOUTUNAVAILABLE

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:
nfs41-do-not-return-enomem-on-layoutunavailable.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 <[email protected]> know about it.

From: Tigran Mkrtchyan <[email protected]>
Date: Tue, 16 Jan 2018 22:38:50 +0100
Subject: nfs41: do not return ENOMEM on LAYOUTUNAVAILABLE

From: Tigran Mkrtchyan <[email protected]>

commit 7ff4cff637aa0bd2abbd81f53b2a6206c50afd95 upstream.

A pNFS server may return LAYOUTUNAVAILABLE error on LAYOUTGET for files which don't have any layout. In this situation pnfs_update_layout currently returns NULL. As this NULL is converted into ENOMEM, IO requests fails instead of falling back to MDS.

Do not return ENOMEM on LAYOUTUNAVAILABLE and let client retry through MDS.

Fixes 8d40b0f14846f. I will suggest to backport this fix to affected stable branches.

---
 fs/nfs/filelayout/filelayout.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

@@ -895,9 +895,7 @@ fl_pnfs_update_layout(struct inode *ino,
 
 	lseg = pnfs_update_layout(ino, ctx, pos, count, iomode, strict_iomode,
 				  gfp_flags);
-	if (!lseg)
-		lseg = ERR_PTR(-ENOMEM);
-	if (IS_ERR(lseg))
+	if (IS_ERR_OR_NULL(lseg))
 		goto out;
 
 	lo = NFS_I(ino)->layout;

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/nfs41-do-not-return-enomem-on-layoutunavailable.patch