From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8B127223336; Thu, 30 Jul 2026 01:02:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785373331; cv=none; b=BaqYstO9lUR7JNLxNB7bM9dSvgdb38Gqnbj5KuRJUxXGCyPnw0kc8GLRX5gvtkS6F8JzJ9bOJff/Lt9/oRGe0HZJTggImj2o9D69QbiDxklX4P9TUIdMv5i99nC0VzE/wRZBkWDQUA0NGleT48s2+EJMVDlSU24LKkOAyq97lEY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785373331; c=relaxed/simple; bh=WlzHBCs9xZzKF6koKMMR6ssnmmO8v5eauqO7aTyJOu4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eptToTO9+vrGWgfjtcLj8CUplS4TxbPLcfPZ9wZEhAgj9h6c0ZfRLm16Q+zxuCBVsaGWSHkKrQlpSOgPv8bwzO2OVHW26bJh+hkoNF2XyQZBJ90Ixen1jZ8iPRb2zgawQ2mACUpW0wLPp3DBscbTqH4mNfFMAtq483fvB1glvNc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AxxyMe/w; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AxxyMe/w" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C81D51F000E9; Thu, 30 Jul 2026 01:02:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785373330; bh=EKIAdxI3HDE1vZlZ2g2VBwleDgBhMD8FYVom+mMtedQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AxxyMe/wOHa7Cn+ybX3x7D5U8SeNJ+FdoaZBY9agX6OJgsPOkiNx/0LwhxyErpSAF dDEfeSmR4hjRiuENus57ZOI9LoyUwVsNr3msmrzcA0SRx3QOI4Pwpq/4wT8lY4T3AH X3Cok/fs8DXctC2xJwD4ZZ9XQQpw6pAfqTFB5roO8uA7SLogPP3I9I84QRPnp06P5n 5nM7xqh3YTgIATr1zBQ5x2bHakg8Ho+YE1f0vWLGfIW9JspzW2h5JdoEQvRcm5RDUp xbl1UtwM2A2fVCbfAwJTThV7GeEbItrdTNTuuq+IAsT6nlHOFuS9VzEmL8KSJ1AnY5 zeLBRP2CsvPVw== From: Sasha Levin To: stable@vger.kernel.org Cc: David Howells , Marc Dionne , linux-afs@lists.infradead.org, linux-fsdevel@vger.kernel.org, Sasha Levin Subject: [PATCH 6.12.y 1/8] afs: Improve server refcount/active count tracing Date: Wed, 29 Jul 2026 21:02:01 -0400 Message-ID: <20260730010208.1700694-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026072116-feeble-cusp-7fff@gregkh> References: <2026072116-feeble-cusp-7fff@gregkh> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: David Howells [ Upstream commit 76daa300d41acc1180f8a46eead36905054beafb ] Improve server refcount/active count tracing to distinguish between simply getting/putting a ref and using/unusing the server record (which changes the activity count as well as the refcount). This makes it a bit easier to work out what's going on. Signed-off-by: David Howells cc: Marc Dionne cc: linux-afs@lists.infradead.org cc: linux-fsdevel@vger.kernel.org Link: https://lore.kernel.org/r/20250224234154.2014840-10-dhowells@redhat.com/ # v1 Link: https://lore.kernel.org/r/20250310094206.801057-6-dhowells@redhat.com/ # v4 Stable-dep-of: 55e841836c6f ("afs: Fix lack of locking around modifications of net->cells_dyn_ino") Signed-off-by: Sasha Levin --- fs/afs/fsclient.c | 4 ++-- fs/afs/rxrpc.c | 2 +- fs/afs/server.c | 11 ++++++----- fs/afs/server_list.c | 4 ++-- include/trace/events/afs.h | 27 +++++++++++++++------------ 5 files changed, 26 insertions(+), 22 deletions(-) diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c index 098fa034a1ccb4..a494657ba4aa90 100644 --- a/fs/afs/fsclient.c +++ b/fs/afs/fsclient.c @@ -1650,7 +1650,7 @@ int afs_fs_give_up_all_callbacks(struct afs_net *net, struct afs_server *server, bp = call->request; *bp++ = htonl(FSGIVEUPALLCALLBACKS); - call->server = afs_use_server(server, afs_server_trace_give_up_cb); + call->server = afs_use_server(server, afs_server_trace_use_give_up_cb); afs_make_call(call, GFP_NOFS); afs_wait_for_call_to_complete(call); ret = call->error; @@ -1756,7 +1756,7 @@ bool afs_fs_get_capabilities(struct afs_net *net, struct afs_server *server, return false; call->key = key; - call->server = afs_use_server(server, afs_server_trace_get_caps); + call->server = afs_use_server(server, afs_server_trace_use_get_caps); call->peer = rxrpc_kernel_get_peer(estate->addresses->addrs[addr_index].peer); call->probe = afs_get_endpoint_state(estate, afs_estate_trace_get_getcaps); call->probe_index = addr_index; diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c index e9707624c5656c..fbaa8668018f19 100644 --- a/fs/afs/rxrpc.c +++ b/fs/afs/rxrpc.c @@ -184,7 +184,7 @@ static void afs_free_call(struct afs_call *call) if (call->type->destructor) call->type->destructor(call); - afs_unuse_server_notime(call->net, call->server, afs_server_trace_put_call); + afs_unuse_server_notime(call->net, call->server, afs_server_trace_unuse_call); kfree(call->request); o = atomic_read(&net->nr_outstanding_calls); diff --git a/fs/afs/server.c b/fs/afs/server.c index 5e40e1332259b4..cfade4a03484d0 100644 --- a/fs/afs/server.c +++ b/fs/afs/server.c @@ -33,7 +33,7 @@ struct afs_server *afs_find_server(struct afs_net *net, const struct rxrpc_peer do { if (server) - afs_unuse_server_notime(net, server, afs_server_trace_put_find_rsq); + afs_unuse_server_notime(net, server, afs_server_trace_unuse_find_rsq); server = NULL; seq++; /* 2 on the 1st/lockless path, otherwise odd */ read_seqbegin_or_lock(&net->fs_addr_lock, &seq); @@ -49,7 +49,7 @@ struct afs_server *afs_find_server(struct afs_net *net, const struct rxrpc_peer server = NULL; continue; found: - server = afs_maybe_use_server(server, afs_server_trace_get_by_addr); + server = afs_maybe_use_server(server, afs_server_trace_use_by_addr); } while (need_seqretry(&net->fs_addr_lock, seq)); @@ -76,7 +76,7 @@ struct afs_server *afs_find_server_by_uuid(struct afs_net *net, const uuid_t *uu * changes. */ if (server) - afs_unuse_server(net, server, afs_server_trace_put_uuid_rsq); + afs_unuse_server(net, server, afs_server_trace_unuse_uuid_rsq); server = NULL; seq++; /* 2 on the 1st/lockless path, otherwise odd */ read_seqbegin_or_lock(&net->fs_lock, &seq); @@ -91,7 +91,7 @@ struct afs_server *afs_find_server_by_uuid(struct afs_net *net, const uuid_t *uu } else if (diff > 0) { p = p->rb_right; } else { - afs_use_server(server, afs_server_trace_get_by_uuid); + afs_use_server(server, afs_server_trace_use_by_uuid); break; } @@ -273,7 +273,8 @@ static struct afs_addr_list *afs_vl_lookup_addrs(struct afs_cell *cell, } /* - * Get or create a fileserver record. + * Get or create a fileserver record and return it with an active-use count on + * it. */ struct afs_server *afs_lookup_server(struct afs_cell *cell, struct key *key, const uuid_t *uuid, u32 addr_version) diff --git a/fs/afs/server_list.c b/fs/afs/server_list.c index d20cd902ef949a..784236b9b2a9e0 100644 --- a/fs/afs/server_list.c +++ b/fs/afs/server_list.c @@ -16,7 +16,7 @@ void afs_put_serverlist(struct afs_net *net, struct afs_server_list *slist) if (slist && refcount_dec_and_test(&slist->usage)) { for (i = 0; i < slist->nr_servers; i++) afs_unuse_server(net, slist->servers[i].server, - afs_server_trace_put_slist); + afs_server_trace_unuse_slist); kfree_rcu(slist, rcu); } } @@ -98,7 +98,7 @@ struct afs_server_list *afs_alloc_server_list(struct afs_volume *volume, if (j < slist->nr_servers) { if (slist->servers[j].server == server) { afs_unuse_server(volume->cell->net, server, - afs_server_trace_put_slist_isort); + afs_server_trace_unuse_slist_isort); continue; } diff --git a/include/trace/events/afs.h b/include/trace/events/afs.h index 4fcfb2411f9df2..527188f393caa3 100644 --- a/include/trace/events/afs.h +++ b/include/trace/events/afs.h @@ -132,22 +132,25 @@ enum yfs_cm_operation { EM(afs_server_trace_destroy, "DESTROY ") \ EM(afs_server_trace_free, "FREE ") \ EM(afs_server_trace_gc, "GC ") \ - EM(afs_server_trace_get_by_addr, "GET addr ") \ - EM(afs_server_trace_get_by_uuid, "GET uuid ") \ - EM(afs_server_trace_get_caps, "GET caps ") \ EM(afs_server_trace_get_install, "GET inst ") \ - 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") \ EM(afs_server_trace_put_probe, "PUT probe") \ - EM(afs_server_trace_put_slist, "PUT slist") \ - EM(afs_server_trace_put_slist_isort, "PUT isort") \ - EM(afs_server_trace_put_uuid_rsq, "PUT u-req") \ - E_(afs_server_trace_update, "UPDATE") + EM(afs_server_trace_see_expired, "SEE expd ") \ + EM(afs_server_trace_unuse_call, "UNU call ") \ + EM(afs_server_trace_unuse_create_fail, "UNU cfail") \ + EM(afs_server_trace_unuse_find_rsq, "UNU f-rsq") \ + EM(afs_server_trace_unuse_slist, "UNU slist") \ + EM(afs_server_trace_unuse_slist_isort, "UNU isort") \ + EM(afs_server_trace_unuse_uuid_rsq, "PUT u-req") \ + EM(afs_server_trace_update, "UPDATE ") \ + EM(afs_server_trace_use_by_addr, "USE addr ") \ + EM(afs_server_trace_use_by_uuid, "USE uuid ") \ + EM(afs_server_trace_use_cm_call, "USE cm-cl") \ + EM(afs_server_trace_use_get_caps, "USE gcaps") \ + EM(afs_server_trace_use_give_up_cb, "USE gvupc") \ + E_(afs_server_trace_wait_create, "WAIT crt ") #define afs_volume_traces \ EM(afs_volume_trace_alloc, "ALLOC ") \ @@ -1369,7 +1372,7 @@ TRACE_EVENT(afs_server, __entry->reason = reason; ), - TP_printk("s=%08x %s u=%d a=%d", + TP_printk("s=%08x %s r=%d a=%d", __entry->server, __print_symbolic(__entry->reason, afs_server_traces), __entry->ref, -- 2.53.0