From patchwork Mon Mar 25 04:44:42 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: 782477 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 AD1E61C32A0; Mon, 25 Mar 2024 04:45:30 +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=1711341930; cv=none; b=rsT+xnp/9YiSTtPsH6WC6RCQBIJ63gaD7GrBhCqQa14lprjZZFhb5/UL+T8uD8+qZwyNEPkQvwp51WwqH9l7sJt8fZsA1/BD+sZSkFxNopRuNBWgQ5nPxOfd0BAkNr+U+j+3xtUBhS9Wi1nJ136xTVlhQqgGhFXkEO0bqr4wk5g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711341930; c=relaxed/simple; bh=Fvr6VEzT58EffMpVI6doCZCQhJL73ahLPR4ALZ5o7yA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ac/l6bNLU4wX+hLRwW9vvVh+IwCzD6r0MJ+s1Pgro89x5dp9tdGEdFwgSax8ZDkWEFv+fMlkluWroA96+djZ0VDbyMIB26ZWDIuXHY3rV7TkNrDKtKwqvnxEWWjXyWE4IXeNDG5TyNnt0YE1W+l6hONFAfdwSYkRlzijxNzwdMM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FytFscoR; 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="FytFscoR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 096BCC433A6; Mon, 25 Mar 2024 04:45:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711341930; bh=Fvr6VEzT58EffMpVI6doCZCQhJL73ahLPR4ALZ5o7yA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FytFscoRPen7qNQYKnBedFFhhQkn8PEMJWLcjXQumbIJHzzxbvEyx5QGAybIg5H7D YhIzMtvylgwxsYK+dPYkZLT4wpiY4kn2+roTxq/xX5ZHlYJh5h0dkszzs7jaLAs7Nt J+pbtFN2+AkCrMYYARqVBszTXVw76fDfPG1TGeQjM/xJRCecorMXZg2h47XRWOVT+G 8hce22mIRoUiqv2osHLnHgtPmZrEpAJFMH0f0QlMD6+OzqUrs08Io6zWIZGfmlhzNa 7h+y5McsFQ+SPqMDbrHZGP0sbVjald2qJO+kMJ4XVAq5SMFPChw3GxO1nwM0MfBp5o rfmjCysJzMgbA== 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 Cc: Christoph Hellwig Subject: [PATCH v2 18/28] null_blk: Introduce fua attribute Date: Mon, 25 Mar 2024 13:44:42 +0900 Message-ID: <20240325044452.3125418-19-dlemoal@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240325044452.3125418-1-dlemoal@kernel.org> References: <20240325044452.3125418-1-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 --- 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 cd6519360dbc..47e1bbb5b24e 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 {