linux-kernel - [PATCH net 7/7] afs: Fix error handling in VL server rotation

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Message-ID: <159854066219.1382667.2526502599415329370.stgit@warthog.procyon.org.uk>
Date:   Thu, 27 Aug 2020 16:04:22 +0100
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net 7/7] afs: Fix error handling in VL server rotation

The error handling in the VL server rotation in the case of there being no
contactable servers is not correct.  In such a case, the records of all the
servers in the list are scanned and the errors and abort codes are mapped
and prioritised and one error is chosen.  This is then forgotten and the
default error is used (EDESTADDRREQ).

Fix this by using the calculated error.

Also we need to note whether a server responded on one of its endpoints so
that we can priorise an error from an abort message over local and network
errors.

Fixes: 4584ae96ae30 ("afs: Fix missing net error handling")
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/vl_rotate.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/afs/vl_rotate.c b/fs/afs/vl_rotate.c
index ab2beb4ba20e..c0458c903b31 100644
--- a/fs/afs/vl_rotate.c
+++ b/fs/afs/vl_rotate.c
@@ -263,10 +263,14 @@ bool afs_select_vlserver(struct afs_vl_cursor *vc)
 	for (i = 0; i < vc->server_list->nr_servers; i++) {
 		struct afs_vlserver *s = vc->server_list->servers[i].server;

+		if (test_bit(AFS_VLSERVER_FL_RESPONDING, &s->flags))
+			e.responded = true;
 		afs_prioritise_error(&e, READ_ONCE(s->probe.error),
 				     s->probe.abort_code);
 	}

+	error = e.error;
+
 failed_set_error:
 	vc->error = error;
 failed: