From patchwork Thu Nov 9 15:39:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13451241 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 9D025225D1 for ; Thu, 9 Nov 2023 15:41:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="HAx7bGWP" Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A19CF3842 for ; Thu, 9 Nov 2023 07:41:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1699544460; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=10WqmQSADk7qMGJXNcd8a75eJRlP3RB62QFNiYq3tlU=; b=HAx7bGWPJZe7tQSBoVI8gwauD9ktPTsuh4mFxuGuDuS+vx+106EmLgvgBqOmpIDBInF50P CvGvDiR7Y+5ajpC34d0vxAfw0Amx6/kdQF1mmHbWGQuziFfOLW5LEvtDP8PlYbhNckEkvW 5iMT7uyZodJGCG+c4u1Mw/tzAVLApvM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-691-Ysvxl22LN2OZys7cSxQVJQ-1; Thu, 09 Nov 2023 10:40:59 -0500 X-MC-Unique: Ysvxl22LN2OZys7cSxQVJQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E4B2C106500A; Thu, 9 Nov 2023 15:40:57 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.13]) by smtp.corp.redhat.com (Postfix) with ESMTP id 272642166B26; Thu, 9 Nov 2023 15:40:57 +0000 (UTC) From: David Howells To: Marc Dionne Cc: David Howells , linux-afs@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 27/41] afs: Mark address lists with configured priorities Date: Thu, 9 Nov 2023 15:39:50 +0000 Message-ID: <20231109154004.3317227-28-dhowells@redhat.com> In-Reply-To: <20231109154004.3317227-1-dhowells@redhat.com> References: <20231109154004.3317227-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 Add a field to each address in an address list (afs_addr_list struct) that records the current priority for that address according to the address preference table. We don't want to do this every time we use an address list, so the version number of the address preference table is recorded in the address list too and we only re-mark the list when we see the version change. These numbers are then displayed through /proc/net/afs/servers. Signed-off-by: David Howells cc: Marc Dionne cc: linux-afs@lists.infradead.org --- fs/afs/addr_prefs.c | 82 +++++++++++++++++++++++++++++++++++++++++++++ fs/afs/internal.h | 4 +++ fs/afs/proc.c | 9 ++--- 3 files changed, 91 insertions(+), 4 deletions(-) diff --git a/fs/afs/addr_prefs.c b/fs/afs/addr_prefs.c index c6dcff4f8aa1..a189ff8a5034 100644 --- a/fs/afs/addr_prefs.c +++ b/fs/afs/addr_prefs.c @@ -447,3 +447,85 @@ int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size) ret = -EINVAL; goto done; } + +/* + * Mark the priorities on an address list if the address preferences table has + * changed. The caller must hold the RCU read lock. + */ +void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist) +{ + const struct afs_addr_preference_list *preflist = + rcu_dereference(net->address_prefs); + const struct sockaddr_in6 *sin6; + const struct sockaddr_in *sin; + const struct sockaddr *sa; + struct afs_addr_preference test; + enum cmp_ret cmp; + int i, j; + + if (!preflist || !preflist->nr || !alist->nr_addrs || + smp_load_acquire(&alist->addr_pref_version) == preflist->version) + return; + + test.family = AF_INET; + test.subnet_mask = 32; + test.prio = 0; + for (i = 0; i < alist->nr_ipv4; i++) { + sa = rxrpc_kernel_remote_addr(alist->addrs[i].peer); + sin = (const struct sockaddr_in *)sa; + test.ipv4_addr = sin->sin_addr; + for (j = 0; j < preflist->ipv6_off; j++) { + cmp = afs_cmp_address_pref(&test, &preflist->prefs[j]); + switch (cmp) { + case CONTINUE_SEARCH: + continue; + case INSERT_HERE: + break; + case EXACT_MATCH: + case SUBNET_MATCH: + WRITE_ONCE(alist->addrs[i].prio, preflist->prefs[j].prio); + break; + } + } + } + + test.family = AF_INET6; + test.subnet_mask = 128; + test.prio = 0; + for (; i < alist->nr_addrs; i++) { + sa = rxrpc_kernel_remote_addr(alist->addrs[i].peer); + sin6 = (const struct sockaddr_in6 *)sa; + test.ipv6_addr = sin6->sin6_addr; + for (j = preflist->ipv6_off; j < preflist->nr; j++) { + cmp = afs_cmp_address_pref(&test, &preflist->prefs[j]); + switch (cmp) { + case CONTINUE_SEARCH: + continue; + case INSERT_HERE: + break; + case EXACT_MATCH: + case SUBNET_MATCH: + WRITE_ONCE(alist->addrs[i].prio, preflist->prefs[j].prio); + break; + } + } + } + + smp_store_release(&alist->addr_pref_version, preflist->version); +} + +/* + * Mark the priorities on an address list if the address preferences table has + * changed. Avoid taking the RCU read lock if we can. + */ +void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist) +{ + if (!net->address_prefs || + /* Load version before prefs */ + smp_load_acquire(&net->address_pref_version) == alist->addr_pref_version) + return; + + rcu_read_lock(); + afs_get_address_preferences_rcu(net, alist); + rcu_read_unlock(); +} diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 8bafe3b7529d..90b82e50da18 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -97,6 +97,7 @@ struct afs_addr_preference_list { struct afs_address { struct rxrpc_peer *peer; short last_error; /* Last error from this address */ + u16 prio; /* Address priority */ }; /* @@ -107,6 +108,7 @@ struct afs_addr_list { refcount_t usage; u32 version; /* Version */ unsigned int debug_id; + unsigned int addr_pref_version; /* Version of address preference list */ unsigned char max_addrs; unsigned char nr_addrs; unsigned char preferred; /* Preferred address */ @@ -1009,6 +1011,8 @@ extern int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *addr, * addr_prefs.c */ int afs_proc_addr_prefs_write(struct file *file, char *buf, size_t size); +void afs_get_address_preferences_rcu(struct afs_net *net, struct afs_addr_list *alist); +void afs_get_address_preferences(struct afs_net *net, struct afs_addr_list *alist); /* * callback.c diff --git a/fs/afs/proc.c b/fs/afs/proc.c index 2e63c99a4f1e..944eb51e75a1 100644 --- a/fs/afs/proc.c +++ b/fs/afs/proc.c @@ -447,17 +447,18 @@ static int afs_proc_servers_show(struct seq_file *m, void *v) (int)(jiffies - server->probed_at) / HZ, atomic_read(&server->probe_outstanding)); failed = alist->probe_failed; - seq_printf(m, " - ALIST v=%u rsp=%lx f=%lx\n", - alist->version, alist->responded, alist->probe_failed); + seq_printf(m, " - ALIST v=%u rsp=%lx f=%lx ap=%u\n", + alist->version, alist->responded, alist->probe_failed, + alist->addr_pref_version); for (i = 0; i < alist->nr_addrs; i++) { const struct afs_address *addr = &alist->addrs[i]; - seq_printf(m, " [%x] %pISpc%s rtt=%d err=%d\n", + seq_printf(m, " [%x] %pISpc%s rtt=%d err=%d p=%u\n", i, rxrpc_kernel_remote_addr(addr->peer), alist->preferred == i ? "*" : test_bit(i, &failed) ? "!" : "", rxrpc_kernel_get_srtt(addr->peer), - addr->last_error); + addr->last_error, addr->prio); } return 0; }