From patchwork Wed May 29 05:04:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13677788 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 B2F0A161307; Wed, 29 May 2024 05:05:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716959148; cv=none; b=Cq87FuyxofJseyF8XQIyuvbUTvstUnAJ/Za925pTivYb8nkPncSGOkEAdOtbRXzPwD/RKjy8VaqoV/VXOKREq4/QE+QBroBGwnQAgaTPBgVnDwRLz5AohgSacMEcfdpcoX5Ob/KKebp3o4Xwq9Y/Zn7MXMJudHlA+OHlFOb4OYo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716959148; c=relaxed/simple; bh=OyNECHjXr3nPPezBAxkgdWSgnFHJf6zBdO/G7WJxGZk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HmnElPvYyOlt2Oq2dyqxRr9QKILvA+Gqdnd95q4nADHGV8ilBjOnOdNAX/v47oSAyQNJKW1EnvpoCirzMuozBGnAgMpZHx4JRcmBVh6fy2pVT8xvsBNFX7NmiR46t0vAwo05j09RQV6C5RQf4vUatNKF0+TejicXXMLxRle5u0U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ReWXkSxr; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ReWXkSxr" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; 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=8d6ngVwHNTNauOwhnmSKDDZurLIjQvxFhyRamCIijqE=; b=ReWXkSxrT/T0XfXFgzP7fcQh8P LoBLaZcev4afPR23+iF5PXS7kCs2z2TUVpoIyd/78ykilQnjG3jxnGKaz2qygkpvtbwzRtjvrCAYl kRalvqMO0n637ZnM+ujlbGRx9Uu7J/K8mx82XsU4sJ6adxwSBGxzWOrKd2C7hHkoCEYhQW7+4GHs4 8eb0wh5wj73qBWmxsrBOfDOpKI6TsU3lSvJljEqqgtLUrlfbSgX2/FMMZqnCGSthgaaxRI+ADIMzo LhS0RyV7JdhFep0OEvQhfZB6LNhKVpnMk+2X11OFk5auX0QSxcd9e8fvmb2iVW/2tkg3CnDFmOfdP YoUBvdAw==; Received: from 2a02-8389-2341-5b80-7775-b725-99f7-3344.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:7775:b725:99f7:3344] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sCBVO-00000002pk9-3paf; Wed, 29 May 2024 05:05:43 +0000 From: Christoph Hellwig To: Jens Axboe , "Martin K. Petersen" Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , Josef Bacik , Ilya Dryomov , Dongsheng Yang , =?utf-8?q?Roger_Pau_Monn?= =?utf-8?q?=C3=A9?= , linux-um@lists.infradead.org, linux-block@vger.kernel.org, nbd@other.debian.org, ceph-devel@vger.kernel.org, xen-devel@lists.xenproject.org, linux-scsi@vger.kernel.org Subject: [PATCH 12/12] block: add special APIs for run-time disabling of discard and friends Date: Wed, 29 May 2024 07:04:14 +0200 Message-ID: <20240529050507.1392041-13-hch@lst.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240529050507.1392041-1-hch@lst.de> References: <20240529050507.1392041-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html A few drivers optimistically try to support discard, write zeroes and secure erase and disable the features from the I/O completion handler if the hardware can't support them. This disable can't be done using the atomic queue limits API because the I/O completion handlers can't take sleeping locks or freezer the queue. Keep the existing clearing of the relevant field to zero, but replace the old blk_queue_max_* APIs with new disable APIs that force the value to 0. Signed-off-by: Christoph Hellwig Reviewed-by: Damien Le Moal Reviewed-by: Bart Van Assche Reviewed-by: John Garry --- arch/um/drivers/ubd_kern.c | 5 ++--- block/blk-settings.c | 41 ------------------------------------ drivers/block/xen-blkfront.c | 4 ++-- drivers/scsi/sd.c | 4 ++-- include/linux/blkdev.h | 28 ++++++++++++++++++------ 5 files changed, 28 insertions(+), 54 deletions(-) diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index a79a3b7c33a647..7eae1519300fbd 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c @@ -475,10 +475,9 @@ static void ubd_handler(void) struct request_queue *q = io_req->req->q; if (req_op(io_req->req) == REQ_OP_DISCARD) - blk_queue_max_discard_sectors(q, 0); + blk_queue_disable_discard(q); if (req_op(io_req->req) == REQ_OP_WRITE_ZEROES) - blk_queue_max_write_zeroes_sectors(q, - 0); + blk_queue_disable_write_zeroes(q); } blk_mq_end_request(io_req->req, io_req->error); kfree(io_req); diff --git a/block/blk-settings.c b/block/blk-settings.c index 0b038729608f4b..996f247fc98e80 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -293,47 +293,6 @@ int queue_limits_set(struct request_queue *q, struct queue_limits *lim) } EXPORT_SYMBOL_GPL(queue_limits_set); -/** - * blk_queue_max_discard_sectors - set max sectors for a single discard - * @q: the request queue for the device - * @max_discard_sectors: maximum number of sectors to discard - **/ -void blk_queue_max_discard_sectors(struct request_queue *q, - unsigned int max_discard_sectors) -{ - struct queue_limits *lim = &q->limits; - - lim->max_hw_discard_sectors = max_discard_sectors; - lim->max_discard_sectors = - min(max_discard_sectors, lim->max_user_discard_sectors); -} -EXPORT_SYMBOL(blk_queue_max_discard_sectors); - -/** - * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase - * @q: the request queue for the device - * @max_sectors: maximum number of sectors to secure_erase - **/ -void blk_queue_max_secure_erase_sectors(struct request_queue *q, - unsigned int max_sectors) -{ - q->limits.max_secure_erase_sectors = max_sectors; -} -EXPORT_SYMBOL(blk_queue_max_secure_erase_sectors); - -/** - * blk_queue_max_write_zeroes_sectors - set max sectors for a single - * write zeroes - * @q: the request queue for the device - * @max_write_zeroes_sectors: maximum number of sectors to write per command - **/ -void blk_queue_max_write_zeroes_sectors(struct request_queue *q, - unsigned int max_write_zeroes_sectors) -{ - q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors; -} -EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors); - void disk_update_readahead(struct gendisk *disk) { blk_apply_bdi_limits(disk->bdi, &disk->queue->limits); diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index fd7c0ff2139cee..9b4ec3e4908cce 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -1605,8 +1605,8 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) blkif_req(req)->error = BLK_STS_NOTSUPP; info->feature_discard = 0; info->feature_secdiscard = 0; - blk_queue_max_discard_sectors(rq, 0); - blk_queue_max_secure_erase_sectors(rq, 0); + blk_queue_disable_discard(rq); + blk_queue_disable_secure_erase(rq); } break; case BLKIF_OP_FLUSH_DISKCACHE: diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 03e67936b27928..56fd523b3987a5 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -837,7 +837,7 @@ static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd, static void sd_disable_discard(struct scsi_disk *sdkp) { sdkp->provisioning_mode = SD_LBP_DISABLE; - blk_queue_max_discard_sectors(sdkp->disk->queue, 0); + blk_queue_disable_discard(sdkp->disk->queue); } static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim, @@ -1019,7 +1019,7 @@ static void sd_disable_write_same(struct scsi_disk *sdkp) { sdkp->device->no_write_same = 1; sdkp->max_ws_blocks = 0; - blk_queue_max_write_zeroes_sectors(sdkp->disk->queue, 0); + blk_queue_disable_write_zeroes(sdkp->disk->queue); } static void sd_config_write_same(struct scsi_disk *sdkp, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index bee71deb8ca066..b83441da12456a 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -923,15 +923,31 @@ static inline void queue_limits_cancel_update(struct request_queue *q) mutex_unlock(&q->limits_lock); } +/* + * These helpers are for drivers that have sloppy feature negotiation and might + * have to disable DISCARD, WRITE_ZEROES or SECURE_DISCARD from the I/O + * completion handler when the device returned an indicator that the respective + * feature is not actually supported. They are racy and the driver needs to + * cope with that. Try to avoid this scheme if you can. + */ +static inline void blk_queue_disable_discard(struct request_queue *q) +{ + q->limits.max_discard_sectors = 0; +} + +static inline void blk_queue_disable_secure_erase(struct request_queue *q) +{ + q->limits.max_secure_erase_sectors = 0; +} + +static inline void blk_queue_disable_write_zeroes(struct request_queue *q) +{ + q->limits.max_write_zeroes_sectors = 0; +} + /* * Access functions for manipulating queue properties */ -void blk_queue_max_secure_erase_sectors(struct request_queue *q, - unsigned int max_sectors); -extern void blk_queue_max_discard_sectors(struct request_queue *q, - unsigned int max_discard_sectors); -extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, - unsigned int max_write_same_sectors); void disk_update_readahead(struct gendisk *disk); extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);