This is a note to let you know that I've just added the patch titled
nfs: always update creds in mirror, even when we have an already connected ds
to the 4.1-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:
nfs-always-update-creds-in-mirror-even-when-we-have-an-already-connected-ds.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0c8315dd56577445dd1afe6b9cfa06b7efdf2f82 Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
Date: Wed, 24 Jun 2015 12:10:24 -0400
Subject: nfs: always update creds in mirror, even when we have an already connected ds
From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
commit 0c8315dd56577445dd1afe6b9cfa06b7efdf2f82 upstream.
A ds can be associated with more than one mirror, but we currently skip
setting a mirror's credentials if we find that it's already set up with
a connected client.
The upshot is that we can end up sending DS writes with MDS credentials
instead of properly setting them up. Fix nfs4_ff_layout_prepare_ds to
always verify that the mirror's credentials are set up, even when we
have a DS that's already connected.
Reported-by: Tom Haynes <thomas.haynes@xxxxxxxxxxxxxxx>
Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/flexfilelayout/flexfilelayoutdev.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/nfs/flexfilelayout/flexfilelayoutdev.c
+++ b/fs/nfs/flexfilelayout/flexfilelayoutdev.c
@@ -387,7 +387,7 @@ nfs4_ff_layout_prepare_ds(struct pnfs_la
/* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
smp_rmb();
if (ds->ds_clp)
- goto out;
+ goto out_update_creds;
flavor = nfs4_ff_layout_choose_authflavor(mirror);
@@ -431,7 +431,7 @@ nfs4_ff_layout_prepare_ds(struct pnfs_la
}
}
}
-
+out_update_creds:
if (ff_layout_update_mirror_cred(mirror, ds))
ds = NULL;
out:
Patches currently in stable-queue which might be from jlayton@xxxxxxxxxxxxxxx are
queue-4.1/nfs-increase-size-of-exchange_id-name-string-buffer.patch
queue-4.1/nfs-always-update-creds-in-mirror-even-when-we-have-an-already-connected-ds.patch
queue-4.1/nfs-fix-potential-credential-leak-in-ff_layout_update_mirror_cred.patch
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