From patchwork Tue Jun 15 13:10:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12321317 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06DDAC49EA2 for ; Tue, 15 Jun 2021 13:15:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DF0FE6146E for ; Tue, 15 Jun 2021 13:15:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230120AbhFONRR (ORCPT ); Tue, 15 Jun 2021 09:17:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229977AbhFONRQ (ORCPT ); Tue, 15 Jun 2021 09:17:16 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 674C3C061574; Tue, 15 Jun 2021 06:15:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=3z22i3o1IYVvzDBHHwFmESs6m1NW1WLgP5++bAzjFgg=; b=rhGVhXPRuuMavZ8mOb+BymSVHB EHVl8Yzdi/UJpS3Z9ChEzJSWLaORZFCWSnkV9SJdbS86HaP1BNtgDdo4slchhO6yHVNT2/A6EugPf BhsCgg5jjPoxFlUyF7Qyb1uG4OOsihS/vNa4be12bnWCkhqtWg6Y+nvCExGXAzYj3GBcsTvXxdA67 X5e383ErlNa2Q/X7yzudlEdPESPJj05+T/fkw82dP7tSpZkDc6wros7nJvKo9JY76KfRYhA0I5g/a yMr0TxB5fmN5ycLYokgKFXYglnYUCLo2hUkvmmiJl2JahkkxoNg4DGYRr320vBK1YogPtQKCGUJwj yzljWZQw==; Received: from [2001:4bb8:19b:fdce:9045:1e63:20f0:ca9] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1lt8te-006nPp-4c; Tue, 15 Jun 2021 13:14:30 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Jeffle Xu , Ming Lei , Damien Le Moal , Keith Busch , Sagi Grimberg , "Wunderlich, Mark" , "Vasudevan, Anil" , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nvme@lists.infradead.org Subject: [PATCH 14/16] block: don't allow writing to the poll queue attribute Date: Tue, 15 Jun 2021 15:10:32 +0200 Message-Id: <20210615131034.752623-15-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210615131034.752623-1-hch@lst.de> References: <20210615131034.752623-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org The poll attribute is a historic artefact from before when we had explicit poll queues that require driver specific configuration. Just print a warning when writing to the attribute. Signed-off-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Tested-by: Mark Wunderlich --- block/blk-sysfs.c | 23 ++++------------------- 1 file changed, 4 insertions(+), 19 deletions(-) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index f89e2fc3963b..f78e73ca6091 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -428,26 +428,11 @@ static ssize_t queue_poll_show(struct request_queue *q, char *page) static ssize_t queue_poll_store(struct request_queue *q, const char *page, size_t count) { - unsigned long poll_on; - ssize_t ret; - - if (!q->tag_set || q->tag_set->nr_maps <= HCTX_TYPE_POLL || - !q->tag_set->map[HCTX_TYPE_POLL].nr_queues) + if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) return -EINVAL; - - ret = queue_var_store(&poll_on, page, count); - if (ret < 0) - return ret; - - if (poll_on) { - blk_queue_flag_set(QUEUE_FLAG_POLL, q); - } else { - blk_mq_freeze_queue(q); - blk_queue_flag_clear(QUEUE_FLAG_POLL, q); - blk_mq_unfreeze_queue(q); - } - - return ret; + pr_info_ratelimited("writes to the poll attribute are ignored.\n"); + pr_info_ratelimited("please use driver specific parameters instead.\n"); + return count; } static ssize_t queue_io_timeout_show(struct request_queue *q, char *page)