linux-kernel - [PATCH AUTOSEL 5.9 018/147] afs: Don't assert on unpurgeable server records

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Date:   Mon, 26 Oct 2020 19:46:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        Sasha Levin <sashal@...nel.org>, linux-afs@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.9 018/147] afs: Don't assert on unpurgeable server records

From: David Howells <dhowells@...hat.com>

[ Upstream commit 7530d3eb3dcf1a30750e8e7f1f88b782b96b72b8 ]

Don't give an assertion failure on unpurgeable afs_server records - which
kills the thread - but rather emit a trace line when we are purging a
record (which only happens during network namespace removal or rmmod) and
print a notice of the problem.

Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/afs/server.c            | 7 ++++++-
 include/trace/events/afs.h | 2 ++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/afs/server.c b/fs/afs/server.c
index e82e452e26124..684a2b02b9ff7 100644
--- a/fs/afs/server.c
+++ b/fs/afs/server.c
@@ -550,7 +550,12 @@ void afs_manage_servers(struct work_struct *work)
 
 		_debug("manage %pU %u", &server->uuid, active);
 
-		ASSERTIFCMP(purging, active, ==, 0);
+		if (purging) {
+			trace_afs_server(server, atomic_read(&server->ref),
+					 active, afs_server_trace_purging);
+			if (active != 0)
+				pr_notice("Can't purge s=%08x\n", server->debug_id);
+		}
 
 		if (active == 0) {
 			time64_t expire_at = server->unuse_time;
diff --git a/include/trace/events/afs.h b/include/trace/events/afs.h
index 5f0c1cf1ea130..55d53234bfdf6 100644
--- a/include/trace/events/afs.h
+++ b/include/trace/events/afs.h
@@ -40,6 +40,7 @@ enum afs_server_trace {
 	afs_server_trace_get_new_cbi,
 	afs_server_trace_get_probe,
 	afs_server_trace_give_up_cb,
+	afs_server_trace_purging,
 	afs_server_trace_put_call,
 	afs_server_trace_put_cbi,
 	afs_server_trace_put_find_rsq,
@@ -270,6 +271,7 @@ enum afs_cb_break_reason {
 	EM(afs_server_trace_get_new_cbi,	"GET cbi  ") \
 	EM(afs_server_trace_get_probe,		"GET probe") \
 	EM(afs_server_trace_give_up_cb,		"giveup-cb") \
+	EM(afs_server_trace_purging,		"PURGE    ") \
 	EM(afs_server_trace_put_call,		"PUT call ") \
 	EM(afs_server_trace_put_cbi,		"PUT cbi  ") \
 	EM(afs_server_trace_put_find_rsq,	"PUT f-rsq") \
-- 
2.25.1