From 0167236e7d66c5e1e85d902a6abc2529b7544539 Mon Sep 17 00:00:00 2001
From: David Howells <dhowells@redhat.com>
Date: Thu, 26 Oct 2023 01:25:07 +0100
Subject: [PATCH] afs: Return ENOENT if no cell DNS record can be found
Make AFS return error ENOENT if no cell SRV or AFSDB DNS record (or
cellservdb config file record) can be found rather than returning
EDESTADDRREQ.
Also add cell name lookup info to the cursor dump.
Fixes: d5c32c89b208 ("afs: Fix cell DNS lookup")
Reported-by: Markus Suvanto <markus.suvanto@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216637
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
---
fs/afs/vl_rotate.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/fs/afs/vl_rotate.c b/fs/afs/vl_rotate.c
index 488e58490b16e..eb415ce563600 100644
--- a/fs/afs/vl_rotate.c
+++ b/fs/afs/vl_rotate.c
@@ -58,6 +58,12 @@ static bool afs_start_vl_iteration(struct afs_vl_cursor *vc)
}
/* Status load is ordered after lookup counter load */
+ if (cell->dns_status == DNS_LOOKUP_GOT_NOT_FOUND) {
+ pr_warn("No record of cell %s\n", cell->name);
+ vc->error = -ENOENT;
+ return false;
+ }
+
if (cell->dns_source == DNS_RECORD_UNAVAILABLE) {
vc->error = -EDESTADDRREQ;
return false;
@@ -285,6 +291,7 @@ bool afs_select_vlserver(struct afs_vl_cursor *vc)
*/
static void afs_vl_dump_edestaddrreq(const struct afs_vl_cursor *vc)
{
+ struct afs_cell *cell = vc->cell;
static int count;
int i;
@@ -294,6 +301,9 @@ static void afs_vl_dump_edestaddrreq(const struct afs_vl_cursor *vc)
rcu_read_lock();
pr_notice("EDESTADDR occurred\n");
+ pr_notice("CELL: %s err=%d\n", cell->name, cell->error);
+ pr_notice("DNS: src=%u st=%u lc=%x\n",
+ cell->dns_source, cell->dns_status, cell->dns_lookup_count);
pr_notice("VC: ut=%lx ix=%u ni=%hu fl=%hx err=%hd\n",
vc->untried, vc->index, vc->nr_iterations, vc->flags, vc->error);
--
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