From patchwork Fri Oct 25 21:36:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Keith Busch X-Patchwork-Id: 13851842 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) (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 4B2E21C07FD for ; Fri, 25 Oct 2024 21:37:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.153.30 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729892238; cv=none; b=bY9MNyYduDHOD64XlE5Mym3faZirPmgF1su4XoHRcLuvQFTlukB4HwFZGAmQb3OJzDL91+s/m9DmV2kLPMJ/XoPF/WI1NzdvOYdmab98b/IDnLmQ5wR2Vk0AFb5X+PdDxD0kaAJq/5CtaM1qrD1Gd0P2w6F6WDNd6pXoGQ6/FPQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729892238; c=relaxed/simple; bh=fk12rlCymLgohu/hSpG6ABPr7mBnWL0GZ0jjFaWFkzU=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=s4br72wilPrbmoIgUtjEk/bXwlVvjyw6GcmelNW2iVqDhLy9H4zKYGdmvsNC7ICO0FwWyDjVxXnCGtNs2EeO7u83bNyCi44aDYR+Mr7yOp/rt+mNdx1v8aUAH5F03Q3m6vbMjhe8zezWnKStMSX+PeRoEBdLlUTz9L4lhU3hRR0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b=WPxiNNfT; arc=none smtp.client-ip=67.231.153.30 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="WPxiNNfT" Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49PKXc78001080 for ; Fri, 25 Oct 2024 14:37:14 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=s2048-2021-q4; bh=bbO7+T7xIMipIdGfjCh1Iup93mutgTnr5qBkMOWpsVo=; b=WPxiNNfTRj09 A5JlvhnAHjSuURvFLa1qVSAhgSzqCpIcTGAwzpCM3NWMD78RJ3RUTFDcDPL70nnN q9pUVcivGvyZWujeDvMfRfvdaPVrQnbQXV/lJzshfM2GXOZdDFovVtHSZaGHm86f Zodqxsv55dr1fiG82JCZjsu/C9trclqU5VHa36eYomneDJnF1Vxg5+RBdmjK/MLM VJklxJtiyZKtQAc2BNMDQsBvbSav6VExPlu1S8NhompBuzhBX5++4zcMENiMl+aI 2oR/xoZrNDpuMg2mbDUToWOFL+FMe4FcBlC5Z4TuZg6yeXFc3A6ue1z0IENEPwiG nk7aUgih/Q== Received: from mail.thefacebook.com ([163.114.134.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 42ga1xv7gu-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 25 Oct 2024 14:37:14 -0700 (PDT) Received: from twshared22321.07.ash9.facebook.com (2620:10d:c085:108::150d) by mail.thefacebook.com (2620:10d:c08b:78::c78f) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.1544.11; Fri, 25 Oct 2024 21:37:10 +0000 Received: by devbig638.nha1.facebook.com (Postfix, from userid 544533) id 7AFF91476D73B; Fri, 25 Oct 2024 14:37:06 -0700 (PDT) From: Keith Busch To: , , , CC: , , , , , Keith Busch Subject: [PATCHv9 3/7] block: allow ability to limit partition write hints Date: Fri, 25 Oct 2024 14:36:41 -0700 Message-ID: <20241025213645.3464331-4-kbusch@meta.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241025213645.3464331-1-kbusch@meta.com> References: <20241025213645.3464331-1-kbusch@meta.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: mLivsvs98ZJQx1DNpsw805uo2FeWq05T X-Proofpoint-GUID: mLivsvs98ZJQx1DNpsw805uo2FeWq05T X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-05_03,2024-10-04_01,2024-09-30_01 From: Keith Busch When multiple partitions are used, you may want to enforce different subsets of the available write hints for each partition. Provide a bitmap attribute of the available write hints, and allow an admin to write a different mask to set the partition's allowed write hints. Signed-off-by: Keith Busch --- block/bdev.c | 15 +++++++++++++ block/partitions/core.c | 46 +++++++++++++++++++++++++++++++++++++-- include/linux/blk_types.h | 1 + 3 files changed, 60 insertions(+), 2 deletions(-) diff --git a/block/bdev.c b/block/bdev.c index 738e3c8457e7f..5d23648db457b 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -414,6 +414,7 @@ void __init bdev_cache_init(void) struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) { + unsigned short max_write_hints; struct block_device *bdev; struct inode *inode; @@ -440,6 +441,20 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) return NULL; } bdev->bd_disk = disk; + + max_write_hints = bdev_max_write_hints(bdev); + if (max_write_hints) { + int size = BITS_TO_LONGS(max_write_hints) * sizeof(long); + + bdev->write_hint_mask = kmalloc(size, GFP_KERNEL); + if (!bdev->write_hint_mask) { + free_percpu(bdev->bd_stats); + iput(inode); + return NULL; + } + memset(bdev->write_hint_mask, 0xff, size); + } + return bdev; } diff --git a/block/partitions/core.c b/block/partitions/core.c index 815ed33caa1b8..c0ea0a7b6fa87 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -203,6 +203,42 @@ static ssize_t part_discard_alignment_show(struct device *dev, return sprintf(buf, "%u\n", bdev_discard_alignment(dev_to_bdev(dev))); } +static ssize_t part_write_hint_mask_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct block_device *bdev = dev_to_bdev(dev); + unsigned short max_write_hints = bdev_max_write_hints(bdev); + + if (max_write_hints) + return sprintf(buf, "%*pb\n", max_write_hints, bdev->write_hint_mask); + else + return sprintf(buf, "0"); +} + +static ssize_t part_write_hint_mask_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct block_device *bdev = dev_to_bdev(dev); + unsigned short max_write_hints = bdev_max_write_hints(bdev); + unsigned long *new_mask; + int size; + + if (!max_write_hints) + return count; + + size = BITS_TO_LONGS(max_write_hints) * sizeof(long); + new_mask = kzalloc(size, GFP_KERNEL); + if (!new_mask) + return -ENOMEM; + + bitmap_parse(buf, count, new_mask, max_write_hints); + bitmap_copy(bdev->write_hint_mask, new_mask, max_write_hints); + + return count; +} + static DEVICE_ATTR(partition, 0444, part_partition_show, NULL); static DEVICE_ATTR(start, 0444, part_start_show, NULL); static DEVICE_ATTR(size, 0444, part_size_show, NULL); @@ -211,6 +247,8 @@ static DEVICE_ATTR(alignment_offset, 0444, part_alignment_offset_show, NULL); static DEVICE_ATTR(discard_alignment, 0444, part_discard_alignment_show, NULL); static DEVICE_ATTR(stat, 0444, part_stat_show, NULL); static DEVICE_ATTR(inflight, 0444, part_inflight_show, NULL); +static DEVICE_ATTR(write_hint_mask, 0644, part_write_hint_mask_show, + part_write_hint_mask_store); #ifdef CONFIG_FAIL_MAKE_REQUEST static struct device_attribute dev_attr_fail = __ATTR(make-it-fail, 0644, part_fail_show, part_fail_store); @@ -225,6 +263,7 @@ static struct attribute *part_attrs[] = { &dev_attr_discard_alignment.attr, &dev_attr_stat.attr, &dev_attr_inflight.attr, + &dev_attr_write_hint_mask.attr, #ifdef CONFIG_FAIL_MAKE_REQUEST &dev_attr_fail.attr, #endif @@ -245,8 +284,11 @@ 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); + + kfree(part->write_hint_mask); + 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 6737795220e18..af430e543f7f7 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -73,6 +73,7 @@ struct block_device { #ifdef CONFIG_SECURITY void *bd_security; #endif + unsigned long *write_hint_mask; /* * keep this out-of-line as it's both big and not needed in the fast * path