From patchwork Tue Aug 27 18:02:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Aring X-Patchwork-Id: 13779959 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 44FAB1D3622 for ; Tue, 27 Aug 2024 18:03:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724781801; cv=none; b=JmBOMSozV7sY9Gaao+32cw9J+jeri2ZTLjjwAzQ0lgu4gNgkiS6h0GD00tAiiLkd76Y3N2riqpBJAdOMcUy79LlBR3fCEECve3Yuad/THV6eNKjzWQSBmYIFhMZ0AfWgiGxdyq4CjBmqxKlDEepq5ckavPiuCMPa4eu90Q8GW0Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724781801; c=relaxed/simple; bh=EVl9XmBEGraFkDRmYKHcPjDfOyqLOV5AlkZhIsyCRFg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aQZ4QNXNKY9CfOOnRBWnKY9cHapHImVPN+H5WE+HtZaLaptRsAd8Evf4Wf9cdywmw0Dz6itQVHKjqfhOlrv8w8UwOsyFLKtdlDBVsrQKc9K7rAHMC4oJDOeuUR1aKPHU7+6nQhS9+t/iTEntHXJ10Jr/KQxt/wAxxNv+ONtu3lg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=FH2Xmboh; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FH2Xmboh" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1724781798; 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=WdJBi9yY/9Wqn0S5jG8EeDv8lkEIJtCuMq5NHG08cG8=; b=FH2XmbohWdgTHpmnlZ4DU10m8HztzkmuU7aj+rkYJIZo/0ekyKsD79EzsTnYIjpwCNQpx5 8NqC09xOZSFMT8AZg6AzKk5U1WNZ4wwC9rLKOxtJKE3ktXhCzSmiai7uhP6Y/p/g7yZb7K Cv9FyyQ2O6sRpNZDajN3BH8VR6JARHQ= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-358-qBmchWQzOR6rjT6349ZJ2A-1; Tue, 27 Aug 2024 14:03:14 -0400 X-MC-Unique: qBmchWQzOR6rjT6349ZJ2A-1 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (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 mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id BD06C19560B1; Tue, 27 Aug 2024 18:03:10 +0000 (UTC) Received: from fs-i40c-03.mgmt.fast.eng.rdu2.dc.redhat.com (fs-i40c-03.mgmt.fast.eng.rdu2.dc.redhat.com [10.6.24.150]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 6B81A1955DD6; Tue, 27 Aug 2024 18:03:07 +0000 (UTC) From: Alexander Aring To: teigland@redhat.com Cc: gfs2@lists.linux.dev, song@kernel.org, yukuai3@huawei.com, agruenba@redhat.com, mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, gregkh@linuxfoundation.org, rafael@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, ocfs2-devel@lists.linux.dev, netdev@vger.kernel.org, vvidic@valentin-vidic.from.hr, heming.zhao@suse.com, lucien.xin@gmail.com, paulmck@kernel.org, rcu@vger.kernel.org, juri.lelli@redhat.com, williams@redhat.com, aahringo@redhat.com Subject: [RFC 3/7] dlm: make add_to_waiters() that is can't fail Date: Tue, 27 Aug 2024 14:02:32 -0400 Message-ID: <20240827180236.316946-4-aahringo@redhat.com> In-Reply-To: <20240827180236.316946-1-aahringo@redhat.com> References: <20240827180236.316946-1-aahringo@redhat.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 X-Patchwork-State: RFC If add_to_waiters() fails we have a problem because the previous called functions such as validate_lock_args() or validate_unlock_args() sets specific lkb values that are set for a request, there exists no way back to revert those changes. When there is a pending lock request the original request arguments will be overwritten with unknown consequences. The good news are that I believe those cases that we fail in add_to_waiters() can't happen or very unlikely to happen (only if the DLM user does stupid API things), but if so we have the above mentioned problem. There are two conditions that will be removed here. The first one is the -EINVAL case which contains is_overlap_unlock() or (is_overlap_cancel() and mstype == DLM_MSG_CANCEL). The is_overlap_unlock() is missing for the normal UNLOCK case which is moved to validate_unlock_args(). The is_overlap_cancel() already happens in validate_unlock_args() when DLM_LKF_CANCEL is set. In case of validate_lock_args() we check on is_overlap() when it is not a new request, on a new request the lkb is always new and does not have those values set. The -EBUSY check can't happen in case as for non new lock requests (when DLM_LKF_CONVERT is set) we already check in validate_lock_args() for lkb_wait_type and is_overlap(). Then there is only validate_unlock_args() that will never hit the default case because dlm_unlock() will produce DLM_MSG_UNLOCK and DLM_MSG_CANCEL messages. Signed-off-by: Alexander Aring --- fs/dlm/lock.c | 43 ++++++++++++++----------------------------- 1 file changed, 14 insertions(+), 29 deletions(-) diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index 121d2976986b..8cb5a537bfd3 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -1703,19 +1703,11 @@ static int msg_reply_type(int mstype) /* add/remove lkb from global waiters list of lkb's waiting for a reply from a remote node */ -static int add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid) +static void add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid) { struct dlm_ls *ls = lkb->lkb_resource->res_ls; - int error = 0; spin_lock_bh(&ls->ls_waiters_lock); - - if (is_overlap_unlock(lkb) || - (is_overlap_cancel(lkb) && (mstype == DLM_MSG_CANCEL))) { - error = -EINVAL; - goto out; - } - if (lkb->lkb_wait_type || is_overlap_cancel(lkb)) { switch (mstype) { case DLM_MSG_UNLOCK: @@ -1725,7 +1717,11 @@ static int add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid) set_bit(DLM_IFL_OVERLAP_CANCEL_BIT, &lkb->lkb_iflags); break; default: - error = -EBUSY; + /* should never happen as validate_lock_args() checks + * on lkb_wait_type and validate_unlock_args() only + * creates UNLOCK or CANCEL messages. + */ + WARN_ON_ONCE(1); goto out; } lkb->lkb_wait_count++; @@ -1747,12 +1743,7 @@ static int add_to_waiters(struct dlm_lkb *lkb, int mstype, int to_nodeid) hold_lkb(lkb); list_add(&lkb->lkb_wait_reply, &ls->ls_waiters); out: - if (error) - log_error(ls, "addwait error %x %d flags %x %d %d %s", - lkb->lkb_id, error, dlm_iflags_val(lkb), mstype, - lkb->lkb_wait_type, lkb->lkb_resource->res_name); spin_unlock_bh(&ls->ls_waiters_lock); - return error; } /* We clear the RESEND flag because we might be taking an lkb off the waiters @@ -2926,13 +2917,16 @@ static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args) goto out; } + if (is_overlap_unlock(lkb)) + goto out; + /* cancel not allowed with another cancel/unlock in progress */ if (args->flags & DLM_LKF_CANCEL) { if (lkb->lkb_exflags & DLM_LKF_CANCEL) goto out; - if (is_overlap(lkb)) + if (is_overlap_cancel(lkb)) goto out; if (test_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags)) { @@ -2970,9 +2964,6 @@ static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args) if (lkb->lkb_exflags & DLM_LKF_FORCEUNLOCK) goto out; - if (is_overlap_unlock(lkb)) - goto out; - if (test_bit(DLM_IFL_RESEND_BIT, &lkb->lkb_iflags)) { set_bit(DLM_IFL_OVERLAP_UNLOCK_BIT, &lkb->lkb_iflags); rv = -EBUSY; @@ -3608,10 +3599,7 @@ static int send_common(struct dlm_rsb *r, struct dlm_lkb *lkb, int mstype) to_nodeid = r->res_nodeid; - error = add_to_waiters(lkb, mstype, to_nodeid); - if (error) - return error; - + add_to_waiters(lkb, mstype, to_nodeid); error = create_message(r, lkb, to_nodeid, mstype, &ms, &mh); if (error) goto fail; @@ -3714,10 +3702,7 @@ static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb) to_nodeid = dlm_dir_nodeid(r); - error = add_to_waiters(lkb, DLM_MSG_LOOKUP, to_nodeid); - if (error) - return error; - + add_to_waiters(lkb, DLM_MSG_LOOKUP, to_nodeid); error = create_message(r, NULL, to_nodeid, DLM_MSG_LOOKUP, &ms, &mh); if (error) goto fail; @@ -6342,8 +6327,8 @@ int dlm_debug_add_lkb_to_waiters(struct dlm_ls *ls, uint32_t lkb_id, if (error) return error; - error = add_to_waiters(lkb, mstype, to_nodeid); + add_to_waiters(lkb, mstype, to_nodeid); dlm_put_lkb(lkb); - return error; + return 0; }