From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 EF85DC04EBF for ; Tue, 4 Dec 2018 23:37:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A6923206B6 for ; Tue, 4 Dec 2018 23:37:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="qlMYd37o" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A6923206B6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-block-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726578AbeLDXhn (ORCPT ); Tue, 4 Dec 2018 18:37:43 -0500 Received: from mail-pg1-f196.google.com ([209.85.215.196]:46473 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726092AbeLDXhm (ORCPT ); Tue, 4 Dec 2018 18:37:42 -0500 Received: by mail-pg1-f196.google.com with SMTP id w7so8084253pgp.13 for ; Tue, 04 Dec 2018 15:37:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=FSmFyxdzuP5ug/6YEtOiiyUa72y6iXE8GKTBze9pRyY=; b=qlMYd37o2DkQ1ult2b2Q7Vs9z4B4VNJMb2oQLB4pmOOOM+ETqKmU+ek2WqcteOS/hf 3fk+oxqXy/Ap2ZAVmGRSHOomawgkwGibsgtT2J/vGTH4hNsE5dvMwIA56ufTa5yycteo zy0ALXXboieiifhKsgq4NT97odnaFaZStYGHkEOrYM3YKULleA93Bj8aiKraVQc558AI dCEIfx3LBgPxl6B4RNhZuk49v1r7tjbTOLYk7NX23HIhhZDe6yvWz0TLDZu9P2gkk7VC ZToJmvbqYF6EhWv+YiyJTWD0o8pXj8mDW3KHun/1ywcvZnYVv+03ZknyR5xgRFbpe2TH Dopg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=FSmFyxdzuP5ug/6YEtOiiyUa72y6iXE8GKTBze9pRyY=; b=sWokffGJekUyHmb7QsgNQXCTSfrQfW/zeymhXugef4+W0JS3KbrCIEvyyd/OMY5V14 ZuhGOXghh6CKqXnvCq8y3fHupWdrIk5VJjvr+Ftui1lmKLOnly1EUmoandG1bvEo3rL1 7UCRgy2oB5eOJqkqM9lzBKtfQGiZjrhGT85+2l0xArsLyKCwhMIERrE4HMF+tbOizFqp QbDj2Ov4vDbP8OFnz8SK1uouwgoW6YeDxr5gjewuvhAbXKNzGVho0ajssQRvsO3uESA4 0lH7HyWm6lRuRKX59QvJGje7gZLwmtWFtpDFLekYMZEgZVlaTxQRqWiqAMIHcLrnq6Nc Fd5g== X-Gm-Message-State: AA+aEWZmAgspgJ9KSTufKCJRvXnYl+tlKFEk3orE0X+lzFXZ4pJDV/kR 0Qr+e71HVNgDjbf/PouZBFehSCK5G9o= X-Google-Smtp-Source: AFSGD/UVk0jn174qmJfatEBZtlMDsDTIbnBGv5Qzzs3/ZmsrkcOjoekCOck9thzDRUl5Dal/0aLw5A== X-Received: by 2002:a65:564b:: with SMTP id m11mr17957051pgs.216.1543966661174; Tue, 04 Dec 2018 15:37:41 -0800 (PST) Received: from x1.localdomain (66.29.188.166.static.utbb.net. [66.29.188.166]) by smtp.gmail.com with ESMTPSA id t13sm22527635pgr.42.2018.12.04.15.37.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 04 Dec 2018 15:37:40 -0800 (PST) From: Jens Axboe To: linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-aio@kvack.org Cc: hch@lst.de, jmoyer@redhat.com, Jens Axboe Subject: [PATCH 02/26] block: add REQ_HIPRI_ASYNC Date: Tue, 4 Dec 2018 16:37:05 -0700 Message-Id: <20181204233729.26776-3-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181204233729.26776-1-axboe@kernel.dk> References: <20181204233729.26776-1-axboe@kernel.dk> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org For the upcoming async polled IO, we can't sleep allocating requests. If we do, then we introduce a deadlock where the submitter already has async polled IO in-flight, but can't wait for them to complete since polled requests must be active found and reaped. Signed-off-by: Jens Axboe --- include/linux/blk_types.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index c0ba1a038ff3..1d9c3da0f2a1 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -346,6 +346,7 @@ enum req_flag_bits { #define REQ_NOWAIT (1ULL << __REQ_NOWAIT) #define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP) #define REQ_HIPRI (1ULL << __REQ_HIPRI) +#define REQ_HIPRI_ASYNC (REQ_HIPRI | REQ_NOWAIT) #define REQ_DRV (1ULL << __REQ_DRV) #define REQ_SWAP (1ULL << __REQ_SWAP) -- 2.17.1