From patchwork Tue Nov 19 12:16:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13879809 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 064E01D0E3A; Tue, 19 Nov 2024 12:17:20 +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=1732018642; cv=none; b=maLenixWJr2KI9/8mWwp313dEQLo8dRkQWb2fwYkOEuYs1NFa5bT9v5O5P2JeMPpEFvdh0k/OoGq3iHc7wv1gH2W7uFGvCeFKVMTsyRTf61cahDTan2GuTTIdf5ukZdxwiboAxEZIKSF0p4lBPaJaMkniz86rcvrQ7V1SleZ3xo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732018642; c=relaxed/simple; bh=0mruMxanft8RAOOhOn+R3dNkn6CDPrf8czsoxHAKvXs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Lvic9p91K4ZYNM+s+0Vtla7RuXqvRt4W7SC2Z2ClFfe6O4y7oz4oARySN+2cijIt2WbDyWO6sHQKKZb4evS0+ZxVb7MrePkb0jqPEBYe98WOAz6fj2A0xQdE/9zXGicMoD3dRYhinKcJ/Rb9nZLyyZ/m7WoihW+OCG9PBguOsNY= 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=MGZmuUG5; 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="MGZmuUG5" 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=hi5wiGxgAmC0Cdjfsdl0g9zpBk10TijhAP5DsB115+4=; b=MGZmuUG5w97cSfwF4J9cGxZDwy aQzYCs6GoMDxhAgTIEdPCDR6J1HIu4GhTxJAg+TsGHVkk68cn8ptBmGgiYZCzLdkLJGIcLfNWZSKn X7q5icZsgLRFz1BosbfqEbsldSPfV4+7g4iZKzDrLyq5slY16l4mXKUdi2RrWb/phgNLkeNH5QEma //fyzeaQaMnHJ+d2K7tgHHVz4CKSUJqddal4HKFBZMND34ccirDLLdDAzvSKdtxXu2zQFayvqFQhT PzgpO19j/8Ew8xuL9cJW24D1IVNkQ2MH53TMv0abWK0UvDfi+ZhoPGrAA0NBQAlsPMnAzR++RjZiO tDWKDm7Q==; Received: from 2a02-8389-2341-5b80-1731-a089-d2b1-3edf.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:1731:a089:d2b1:3edf] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tDNAT-0000000CJP8-3EaH; Tue, 19 Nov 2024 12:17:18 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Christian Brauner , Keith Busch , Sagi Grimberg , Kanchan Joshi , Hui Qi , Nitesh Shetty , Jan Kara , Pavel Begunkov , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org Subject: [PATCH 15/15] RFC: block: allow write streams on partitions Date: Tue, 19 Nov 2024 13:16:29 +0100 Message-ID: <20241119121632.1225556-16-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241119121632.1225556-1-hch@lst.de> References: <20241119121632.1225556-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@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 By default assign all write streams to partition 1, and add a hack sysfs files that distributes them all equally. This is implemented by storing the number of per-partition write streams in struct block device, as well as the offset to the global ones, and then remapping the write streams in the I/O submission path. The sysfs is hacky and undocumented, better suggestions welcome from actual users of write stream on partitions. Signed-off-by: Christoph Hellwig --- block/bdev.c | 9 +++++++ block/blk-core.c | 2 ++ block/genhd.c | 52 +++++++++++++++++++++++++++++++++++++++ block/partitions/core.c | 6 +++-- include/linux/blk_types.h | 7 ++++++ include/linux/blkdev.h | 2 +- 6 files changed, 75 insertions(+), 3 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index c23245f1fdfe..f3549a8cdb3f 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -440,6 +440,15 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) return NULL; } bdev->bd_disk = disk; + + /* + * Assign all write streams to the first partition by default. + */ + if (partno == 1) { + bdev->bd_part_write_stream_start = 0; + bdev->bd_part_write_streams = bdev_max_write_streams(bdev); + } + return bdev; } diff --git a/block/blk-core.c b/block/blk-core.c index 666efe8fa202..9654937f9b2d 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -574,6 +574,8 @@ static int blk_partition_remap(struct bio *bio) return -EIO; if (bio_sectors(bio)) { bio->bi_iter.bi_sector += p->bd_start_sect; + if (bio->bi_write_stream) + bio->bi_write_stream += p->bd_part_write_stream_start; trace_block_bio_remap(bio, p->bd_dev, bio->bi_iter.bi_sector - p->bd_start_sect); diff --git a/block/genhd.c b/block/genhd.c index 79230c109fca..3156c70522b6 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1070,6 +1070,54 @@ static ssize_t partscan_show(struct device *dev, return sysfs_emit(buf, "%u\n", disk_has_partscan(dev_to_disk(dev))); } +static ssize_t disk_distribute_write_streams_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + /* Anything useful to show here like the ranges? */ + return sysfs_emit(buf, "0\n"); +} + +static ssize_t disk_distribute_write_streams_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct gendisk *disk = dev_to_disk(dev); + struct block_device *bdev = disk->part0, *part; + unsigned short total_write_streams = + disk->queue->limits.max_write_streams; + unsigned short part_write_streams, part_write_stream_start = 0; + unsigned long nr_partitions = 0, idx; + int error = 0; + + if (!total_write_streams) + return -EINVAL; + + mutex_lock(&disk->open_mutex); + if (atomic_read(&bdev->bd_openers)) { + error = -EBUSY; + goto out_unlock; + } + + xa_for_each_start(&disk->part_tbl, idx, part, 1) + nr_partitions++; + if (!nr_partitions) + goto out_unlock; + + part_write_streams = total_write_streams / nr_partitions; + xa_for_each_start(&disk->part_tbl, idx, part, 1) { + part->bd_part_write_streams = part_write_streams; + part->bd_part_write_stream_start = part_write_stream_start; + part_write_stream_start += part_write_streams; + dev_info(dev, + "assigning %u write streams at %u to partition %lu\n", + part_write_streams, part_write_stream_start, idx - 1); + } +out_unlock: + mutex_unlock(&disk->open_mutex); + if (error) + return error; + return count; +} + static DEVICE_ATTR(range, 0444, disk_range_show, NULL); static DEVICE_ATTR(ext_range, 0444, disk_ext_range_show, NULL); static DEVICE_ATTR(removable, 0444, disk_removable_show, NULL); @@ -1084,6 +1132,9 @@ static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); static DEVICE_ATTR(badblocks, 0644, disk_badblocks_show, disk_badblocks_store); static DEVICE_ATTR(diskseq, 0444, diskseq_show, NULL); static DEVICE_ATTR(partscan, 0444, partscan_show, NULL); +static DEVICE_ATTR(distribute_write_streams, 0644, + disk_distribute_write_streams_show, + disk_distribute_write_streams_store); #ifdef CONFIG_FAIL_MAKE_REQUEST ssize_t part_fail_show(struct device *dev, @@ -1135,6 +1186,7 @@ static struct attribute *disk_attrs[] = { &dev_attr_events_poll_msecs.attr, &dev_attr_diskseq.attr, &dev_attr_partscan.attr, + &dev_attr_distribute_write_streams.attr, #ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif diff --git a/block/partitions/core.c b/block/partitions/core.c index 815ed33caa1b..a27dbb5589ce 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -245,8 +245,10 @@ static const struct attribute_group *part_attr_groups[] = { static void part_release(struct device *dev) { - put_disk(dev_to_bdev(dev)->bd_disk); - bdev_drop(dev_to_bdev(dev)); + struct block_device *part = dev_to_bdev(dev); + + put_disk(part->bd_disk); + bdev_drop(part); } static int part_uevent(const struct device *dev, struct kobj_uevent_env *env) diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 4ca3449ce9c9..02a3d58e814f 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -74,6 +74,13 @@ struct block_device { #ifdef CONFIG_SECURITY void *bd_security; #endif + + /* + * Allow assigning write streams to partitions. + */ + unsigned short bd_part_write_streams; + unsigned short bd_part_write_stream_start; + /* * keep this out-of-line as it's both big and not needed in the fast * path diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 9fda66530d9a..bb0921e642fb 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1242,7 +1242,7 @@ static inline unsigned int bdev_max_segments(struct block_device *bdev) static inline unsigned short bdev_max_write_streams(struct block_device *bdev) { if (bdev_is_partition(bdev)) - return 0; + return bdev->bd_part_write_streams; return bdev_limits(bdev)->max_write_streams; }