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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, David Howells <dhowells@redhat.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.16 250/279] afs: Fix server rotations handling of fileserver probe failure
Date:   Mon, 18 Jun 2018 10:13:55 +0200
Message-Id: <20180618080619.102189875@linuxfoundation.org>
In-Reply-To: <20180618080608.851973560@linuxfoundation.org>
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4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells@redhat.com>

[ Upstream commit ec5a3b4b507efca903d848518dcf2ebf7b04b466 ]

The server rotation algorithm just gives up if it fails to probe a
fileserver.  Fix this by rotating to the next fileserver instead.

Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching and fileserver rotation")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/afs/rotate.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/fs/afs/rotate.c
+++ b/fs/afs/rotate.c
@@ -369,8 +369,16 @@ use_server:
 	if (!test_bit(AFS_SERVER_FL_PROBED, &server->flags)) {
 		fc->ac.alist = afs_get_addrlist(alist);
 
-		if (!afs_probe_fileserver(fc))
-			goto failed;
+		if (!afs_probe_fileserver(fc)) {
+			switch (fc->ac.error) {
+			case -ENOMEM:
+			case -ERESTARTSYS:
+			case -EINTR:
+				goto failed;
+			default:
+				goto next_server;
+			}
+		}
 	}
 
 	if (!fc->ac.alist)