linux-kernel - [PATCH 15/41] afs: Return ENOENT if no cell DNS record can be found

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Message-ID: <20231109154004.3317227-16-dhowells@redhat.com>
Date:   Thu,  9 Nov 2023 15:39:38 +0000
From:   David Howells <dhowells@...hat.com>
To:     Marc Dionne <marc.dionne@...istor.com>
Cc:     David Howells <dhowells@...hat.com>, linux-afs@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Markus Suvanto <markus.suvanto@...il.com>
Subject: [PATCH 15/41] 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.

Reported-by: Markus Suvanto <markus.suvanto@...il.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216637
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.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 af5c6cd1ed44..01c890b3d18d 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);