From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 636C11DED60; Tue, 8 Oct 2024 13:11:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728393064; cv=none; b=UKryu0mrVmRnMJuLG1RKw0YU4YNxATpR6FREkXBk6RQqLANj6/HoMPog8XvajuMMIfO7SmD6D19/pLBWgy8Y2fJ/Y6RTl0gaom9ktrAf7ycYdVQwGMThu1OzxGJXFJk8KUe2UI1n9pxxgmB7AP5aYXXD8Eg1/yDAGy+wc3Scvzo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728393064; c=relaxed/simple; bh=fvWklU6EeBtYvAH5Lgcmo7GAwGLxzzwewyFlT1eb6Aw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NBzmXYqkvGQSGenSABNUwpNbVSlk5bZDNR+q7uCcsYz+FcIkX6HXdwjdKxXlrk16G99S99U8kJGCwrAZV3zYf/y2uO/HeQN22aSAnZt+NoC2okTRzoX8x6FCwNp/EVG28Re6q+1LA7XWhqK4b8AJhONafKx28bwLJr7uFDm41Og= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=doQ+Jsqe; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="doQ+Jsqe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C05F0C4CEC7; Tue, 8 Oct 2024 13:11:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728393064; bh=fvWklU6EeBtYvAH5Lgcmo7GAwGLxzzwewyFlT1eb6Aw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=doQ+Jsqe2COgbqxOtmAFQH5nsAd9Ksz9Seff/tLiU+rjhAZpO5SOt40ytxy3GPnZ3 PHFiXeh02/fCAX1Vh3zknmG98LYXmesGi1nYfFrzoQGMS8J0M9UyRmtSSlE78bkRhb cCmh/AL7GukOftSMvgXkmn4wkyquZENhs3mocun0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christoph Hellwig , Bart Van Assche , Jens Axboe , Sasha Levin Subject: [PATCH 6.6 041/386] loop: dont set QUEUE_FLAG_NOMERGES Date: Tue, 8 Oct 2024 14:04:46 +0200 Message-ID: <20241008115631.090771300@linuxfoundation.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241008115629.309157387@linuxfoundation.org> References: <20241008115629.309157387@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Christoph Hellwig [ Upstream commit 667ea36378cf7f669044b27871c496e1559c872a ] QUEUE_FLAG_NOMERGES isn't really a driver interface, but a user tunable. There also isn't any good reason to set it in the loop driver. The original commit adding it (5b5e20f421c0b6d "block: loop: set QUEUE_FLAG_NOMERGES for request queue of loop") claims that "It doesn't make sense to enable merge because the I/O submitted to backing file is handled page by page." which of course isn't true for multi-page bvec now, and it never has been for direct I/O, for which commit 40326d8a33d ("block/loop: allow request merge for directio mode") alredy disabled the nomerges flag. Signed-off-by: Christoph Hellwig Reviewed-by: Bart Van Assche Link: https://lore.kernel.org/r/20240627124926.512662-2-hch@lst.de Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/loop.c | 15 ++------------- 1 file changed, 2 insertions(+), 13 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 552f56a84a7eb..886c635990377 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -211,13 +211,10 @@ static void __loop_update_dio(struct loop_device *lo, bool dio) if (lo->lo_state == Lo_bound) blk_mq_freeze_queue(lo->lo_queue); lo->use_dio = use_dio; - if (use_dio) { - blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, lo->lo_queue); + if (use_dio) lo->lo_flags |= LO_FLAGS_DIRECT_IO; - } else { - blk_queue_flag_set(QUEUE_FLAG_NOMERGES, lo->lo_queue); + else lo->lo_flags &= ~LO_FLAGS_DIRECT_IO; - } if (lo->lo_state == Lo_bound) blk_mq_unfreeze_queue(lo->lo_queue); } @@ -2038,14 +2035,6 @@ static int loop_add(int i) blk_queue_max_hw_sectors(lo->lo_queue, BLK_DEF_MAX_SECTORS); - /* - * By default, we do buffer IO, so it doesn't make sense to enable - * merge because the I/O submitted to backing file is handled page by - * page. For directio mode, merge does help to dispatch bigger request - * to underlayer disk. We will enable merge once directio is enabled. - */ - blk_queue_flag_set(QUEUE_FLAG_NOMERGES, lo->lo_queue); - /* * Disable partition scanning by default. The in-kernel partition * scanning can be requested individually per-device during its -- 2.43.0