From patchwork Tue Apr 2 12:38:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 785339 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 586F58615E; Tue, 2 Apr 2024 12:39:34 +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=1712061574; cv=none; b=PFXr+Lw1sNfutoZAjzYFlBYQXVYSL4tohhBFWtulPikcoEiahd1L+WqJkJKPqjSSAvCYKmvDJorCqDahR7lPRRDF+k754oIqcQvt/n0Ln+1F+lRonvLJKpeob0hBUfj1TvQxU6DGLP1/Hnr/T6KiPdksXY1MmZr3pjZ0D6ZYQgk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712061574; c=relaxed/simple; bh=cyp7WOQsIFl0ciROaWeBMZvEOeOCq1R+AmapKo/Ymcg=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=o7Fs8ZcG3OgUpcuGoEOLzQJ0KJlXrqtK6fivp0YfH7H38adgg0dffmGLLMnmKbWn48nmQCpMz9dgZk4c1fKnRmrsg83TduH3UZyX194nPPVhP+BJG32FwyFa5xXjTJIzIfFoeC+0g/GYVe/yZzvPdpo3TUaik1bYAclSoZWUWLA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L7J2GRfV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="L7J2GRfV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 26A09C43399; Tue, 2 Apr 2024 12:39:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1712061574; bh=cyp7WOQsIFl0ciROaWeBMZvEOeOCq1R+AmapKo/Ymcg=; h=From:To:Subject:Date:In-Reply-To:References:From; b=L7J2GRfVUVsP921wBCzK/FUM8XH2Kye92o8K35r00pMqGLg+THIBrbFNjQpgpNuxP Al/W0leJ3ONgGAZ+1l+MDy/Phvt1vED0bjJGfuWWl2chR4V3cCN8UQMBVBAqW7z+Aj eZANz2FyyGGqpmnFxYyv6Cy+n9wEIvWB/fbxfcWs5lr5OFHtLKJXQTWE4jPyDLtOa9 7GckZ5sAqcmxniajBs3nBvt9Hah1qufwKaewlRjzOXdHVo33hQlw+TiVflez1hSoIk k1VlBNWjgVcpjKnoHCFQsQ1Lc0la89OwUYrq3w3Uvb+e9RmsWYWCSAYIwH7Wd9ptAF 5HKdr7opWpouA== From: Damien Le Moal To: linux-block@vger.kernel.org, Jens Axboe , linux-scsi@vger.kernel.org, "Martin K . Petersen" , dm-devel@lists.linux.dev, Mike Snitzer , linux-nvme@lists.infradead.org, Keith Busch , Christoph Hellwig Subject: [PATCH v4 17/28] null_blk: Introduce fua attribute Date: Tue, 2 Apr 2024 21:38:56 +0900 Message-ID: <20240402123907.512027-18-dlemoal@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240402123907.512027-1-dlemoal@kernel.org> References: <20240402123907.512027-1-dlemoal@kernel.org> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add the fua configfs attribute and module parameter to allow configuring if the device supports FUA or not. Using this attribute has an effect on the null_blk device only if memory backing is enabled together with a write cache (cache_size option). This new attribute allows configuring a null_blk device with a write cache but without FUA support. This is convenient to test the block layer flush machinery. Signed-off-by: Damien Le Moal Reviewed-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Reviewed-by: Bart Van Assche Reviewed-by: Chaitanya Kulkarni --- drivers/block/null_blk/main.c | 12 ++++++++++-- drivers/block/null_blk/null_blk.h | 1 + 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c index a5a50ba6ad9f..1dfaf2628007 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -225,6 +225,10 @@ static unsigned long g_cache_size; module_param_named(cache_size, g_cache_size, ulong, 0444); MODULE_PARM_DESC(mbps, "Cache size in MiB for memory-backed device. Default: 0 (none)"); +static bool g_fua = true; +module_param_named(fua, g_fua, bool, S_IRUGO); +MODULE_PARM_DESC(zoned, "Enable/disable FUA support when cache_size is used. Default: true"); + static unsigned int g_mbps; module_param_named(mbps, g_mbps, uint, 0444); MODULE_PARM_DESC(mbps, "Limit maximum bandwidth (in MiB/s). Default: 0 (no limit)"); @@ -446,6 +450,7 @@ NULLB_DEVICE_ATTR(virt_boundary, bool, NULL); NULLB_DEVICE_ATTR(no_sched, bool, NULL); NULLB_DEVICE_ATTR(shared_tags, bool, NULL); NULLB_DEVICE_ATTR(shared_tag_bitmap, bool, NULL); +NULLB_DEVICE_ATTR(fua, bool, NULL); static ssize_t nullb_device_power_show(struct config_item *item, char *page) { @@ -593,6 +598,7 @@ static struct configfs_attribute *nullb_device_attrs[] = { &nullb_device_attr_no_sched, &nullb_device_attr_shared_tags, &nullb_device_attr_shared_tag_bitmap, + &nullb_device_attr_fua, NULL, }; @@ -671,7 +677,7 @@ nullb_group_drop_item(struct config_group *group, struct config_item *item) static ssize_t memb_group_features_show(struct config_item *item, char *page) { return snprintf(page, PAGE_SIZE, - "badblocks,blocking,blocksize,cache_size," + "badblocks,blocking,blocksize,cache_size,fua," "completion_nsec,discard,home_node,hw_queue_depth," "irqmode,max_sectors,mbps,memory_backed,no_sched," "poll_queues,power,queue_mode,shared_tag_bitmap," @@ -763,6 +769,8 @@ static struct nullb_device *null_alloc_dev(void) dev->no_sched = g_no_sched; dev->shared_tags = g_shared_tags; dev->shared_tag_bitmap = g_shared_tag_bitmap; + dev->fua = g_fua; + return dev; } @@ -1920,7 +1928,7 @@ static int null_add_dev(struct nullb_device *dev) if (dev->cache_size > 0) { set_bit(NULLB_DEV_FL_CACHE, &nullb->dev->flags); - blk_queue_write_cache(nullb->q, true, true); + blk_queue_write_cache(nullb->q, true, dev->fua); } nullb->q->queuedata = nullb; diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h index a9c5df650ddb..3234e6c85eed 100644 --- a/drivers/block/null_blk/null_blk.h +++ b/drivers/block/null_blk/null_blk.h @@ -105,6 +105,7 @@ struct nullb_device { bool no_sched; /* no IO scheduler for the device */ bool shared_tags; /* share tag set between devices for blk-mq */ bool shared_tag_bitmap; /* use hostwide shared tags */ + bool fua; /* Support FUA */ }; struct nullb {