From patchwork Mon Nov 11 02:39:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 11236463 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DE4E617E6 for ; Mon, 11 Nov 2019 02:39:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BD1CC206C3 for ; Mon, 11 Nov 2019 02:39:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="P3GpTILI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726811AbfKKCjf (ORCPT ); Sun, 10 Nov 2019 21:39:35 -0500 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:52028 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726770AbfKKCje (ORCPT ); Sun, 10 Nov 2019 21:39:34 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1573439975; x=1604975975; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=FdDMBM8oW2SBfdkbPDmth/Mj8PXjLYk7YajwPtVTjXo=; b=P3GpTILIpPb7JVtwqYsfca/xvLIbTMJB/J6oIiBHvoxqE43kPzTferKY G+RMtJCpa4L4Am83cO5j1+6wTcny71D8nnmTdg1+jcBlAUOH+rwES9O9Y OpB/9B+09NvRGFzImLaREpQ9nw/6Xz9cjpMw7OJHOB6NdeLF77P91G7f9 JO6ciaaiWfZcvHLoijjhFc5L2ZXAQcTR1kbReOY+fpSfc9QlTOgasVPfG TlAzSSQkyK2TdrCwTS/um7UO+xaBp4B9bIdnghFNAKjq71DVY8B7f5JPy HeNip4w3/ie2BnNmwYHHdeJULbdUCxLwybSorSB5hx9SOBZXrDWbd3O41 w==; IronPort-SDR: mqtF/u73RMx8s/kGkQPbfu5+fMLpFBY6jxw7/WJ/yZtVCZfKyNxaCjOVWlisTh3EbWVnLvZdP9 Hic/ddv/WCjbANJD1bb4VpJ11ficGyvfEJAwlscvQZ/a2uqHYIkoq9y/oLQg3HonJni6H5HkNf GG49h/+8e98oqzEi6RwfNIxtDlp/E8+1MqGscs/IpUUR+SQJr4SsQ89Mu3FMzWYZEQRkypH3bO yY3+zoJz7xUDntfxOlET0bsRHOr9hKGj9d+E1LPKSaTW/pUg5f8Qv7YOiR7ice+16NBDo5957g 894= X-IronPort-AV: E=Sophos;i="5.68,291,1569254400"; d="scan'208";a="127062960" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 11 Nov 2019 10:39:34 +0800 IronPort-SDR: cFvGGPMmo/wcei5u8RsGjy1RlCCexK02zSkGldsdAxvG3bzk/PGNcTz9hrVx6r3L4vbYJH4gcZ BnWhA6qvpCvEJjNoWx36BVar472SPCiVOG/yWMREwlZi5j/CpDjGtjTAdJLx4feF0ZVwyeSPiW uVlrvLvqSnZTDHVXlUrWESL/rVIT3JCydpdpSfa4rwp/Fd4WwrHG43vzaGje4LSwDnmz0UvVrE lzNbzkH73eTeWoE3fz+dDeBS9MDa8CdLBAnVLJt+hrla7ZbIDyT6OHrUrUWljkV5NRlqn0XgRC tsxIe6GfBfs25xrnepxNA/7Q Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Nov 2019 18:34:39 -0800 IronPort-SDR: 4oxQANO3Le6zwGzSh84WyY/rR6HLvilbmxQhOVSuP4qz734lp+9TQlCDsh2oXnApWZuFEYGinl xIbAznCo/WIgVk0WVuLYnczVGMa0iIt+2ucgguDebEO5GaRSSVw+7yUHCC0MR/N7Pv5LBknbKY 8hDnJaTQgc0y0tK0Dk8bg8RNdNmhFjp2mARQ0sXmp32jMzh3qiY3zMxOqmU+d8P7fnY45nDRVG k5oX+zOEY/IrPFo93bYDDT3zTJ3Q0f2d41WyR/BA2m17hxK8GTVWx68OLqKIWNQGOZ+0+6wePk 56s= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip01.wdc.com with ESMTP; 10 Nov 2019 18:39:34 -0800 From: Damien Le Moal To: linux-block@vger.kernel.org, Jens Axboe , linux-scsi@vger.kernel.org, "Martin K . Petersen" , dm-devel@redhat.com, Mike Snitzer , linux-f2fs-devel@lists.sourceforge.net, Jaegeuk Kim , Chao Yu Subject: [PATCH v2 1/9] block: Enhance blk_revalidate_disk_zones() Date: Mon, 11 Nov 2019 11:39:22 +0900 Message-Id: <20191111023930.638129-2-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191111023930.638129-1-damien.lemoal@wdc.com> References: <20191111023930.638129-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org For ZBC and ZAC zoned devices, the scsi driver revalidation processing implemented by sd_revalidate_disk() includes a call to sd_zbc_read_zones() which executes a full disk zone report used to check that all zones of the disk are the same size. This processing is followed by a call to blk_revalidate_disk_zones(), used to initialize the device request queue zone bitmaps (zone type and zone write lock bitmaps). To do so, blk_revalidate_disk_zones() also executes a full device zone report to obtain zone types. As a result, the entire zoned block device revalidation process includes two full device zone report. By moving the zone size checks into blk_revalidate_disk_zones(), this process can be optimized to a single full device zone report, leading to shorter device scan and revalidation times. This patch implements this optimization, reducing the original full device zone report implemented in sd_zbc_check_zones() to a single, small, report zones command execution to obtain the size of the first zone of the device. Checks whether all zones of the device are the same size as the first zone size are moved to the generic blk_check_zone() function called from blk_revalidate_disk_zones(). This optimization also has the following benefits: 1) fewer memory allocations in the scsi layer during disk revalidation as the potentailly large buffer for zone report execution is not needed. 2) Implement zone checks in a generic manner, reducing the burden on device driver which only need to obtain the zone size and check that this size is a power of 2 number of LBAs. Any new type of zoned block device will benefit from this. Signed-off-by: Damien Le Moal Reviewed-by: Christoph Hellwig Reviewed-by: Hannes Reinecke --- block/blk-zoned.c | 62 +++++++++++++++++++++++- drivers/scsi/sd_zbc.c | 107 ++++++++---------------------------------- 2 files changed, 80 insertions(+), 89 deletions(-) diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 481eaf7d04d4..dae787f67019 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -448,6 +448,58 @@ void blk_queue_free_zone_bitmaps(struct request_queue *q) q->seq_zones_wlock = NULL; } +/* + * Helper function to check the validity of zones of a zoned block device. + */ +static bool blk_zone_valid(struct gendisk *disk, struct blk_zone *zone, + sector_t *sector) +{ + struct request_queue *q = disk->queue; + sector_t zone_sectors = blk_queue_zone_sectors(q); + sector_t capacity = get_capacity(disk); + + /* + * All zones must have the same size, with the exception on an eventual + * smaller last zone. + */ + if (zone->start + zone_sectors < capacity && + zone->len != zone_sectors) { + pr_warn("%s: Invalid zoned device with non constant zone size\n", + disk->disk_name); + return false; + } + + if (zone->start + zone->len >= capacity && + zone->len > zone_sectors) { + pr_warn("%s: Invalid zoned device with larger last zone size\n", + disk->disk_name); + return false; + } + + /* Check for holes in the zone report */ + if (zone->start != *sector) { + pr_warn("%s: Zone gap at sectors %llu..%llu\n", + disk->disk_name, *sector, zone->start); + return false; + } + + /* Check zone type */ + switch (zone->type) { + case BLK_ZONE_TYPE_CONVENTIONAL: + case BLK_ZONE_TYPE_SEQWRITE_REQ: + case BLK_ZONE_TYPE_SEQWRITE_PREF: + break; + default: + pr_warn("%s: Invalid zone type 0x%x at sectors %llu\n", + disk->disk_name, (int)zone->type, zone->start); + return false; + } + + *sector += zone->len; + + return true; +} + /** * blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps * @disk: Target disk @@ -497,7 +549,10 @@ int blk_revalidate_disk_zones(struct gendisk *disk) if (!seq_zones_bitmap) goto out; - /* Get zone information and initialize seq_zones_bitmap */ + /* + * Get zone information to check the zones and initialize + * seq_zones_bitmap. + */ rep_nr_zones = nr_zones; zones = blk_alloc_zones(&rep_nr_zones); if (!zones) @@ -511,11 +566,14 @@ int blk_revalidate_disk_zones(struct gendisk *disk) if (!nrz) break; for (i = 0; i < nrz; i++) { + if (!blk_zone_valid(disk, &zones[i], §or)) { + ret = -ENODEV; + goto out; + } if (zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL) set_bit(z, seq_zones_bitmap); z++; } - sector += nrz * blk_queue_zone_sectors(q); } if (WARN_ON(z != nr_zones)) { diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index 39f10ec0dfcf..7c4690f26698 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -339,32 +339,19 @@ static int sd_zbc_check_zoned_characteristics(struct scsi_disk *sdkp, * Returns the zone size in number of blocks upon success or an error code * upon failure. */ -static int sd_zbc_check_zones(struct scsi_disk *sdkp, u32 *zblocks) +static int sd_zbc_check_zones(struct scsi_disk *sdkp, unsigned char *buf, + u32 *zblocks) { - size_t bufsize, buflen; - unsigned int noio_flag; + size_t buflen; u64 zone_blocks = 0; - sector_t max_lba, block = 0; - unsigned char *buf; + sector_t max_lba; unsigned char *rec; int ret; - u8 same; - - /* Do all memory allocations as if GFP_NOIO was specified */ - noio_flag = memalloc_noio_save(); - /* Get a buffer */ - buf = sd_zbc_alloc_report_buffer(sdkp, SD_ZBC_REPORT_MAX_ZONES, - &bufsize); - if (!buf) { - ret = -ENOMEM; - goto out; - } - - /* Do a report zone to get max_lba and the same field */ - ret = sd_zbc_do_report_zones(sdkp, buf, bufsize, 0, false); + /* Do a report zone to get max_lba and the size of the first zone */ + ret = sd_zbc_do_report_zones(sdkp, buf, SD_BUF_SIZE, 0, false); if (ret) - goto out_free; + return ret; if (sdkp->rc_basis == 0) { /* The max_lba field is the capacity of this device */ @@ -379,82 +366,28 @@ static int sd_zbc_check_zones(struct scsi_disk *sdkp, u32 *zblocks) } } - /* - * Check same field: for any value other than 0, we know that all zones - * have the same size. - */ - same = buf[4] & 0x0f; - if (same > 0) { - rec = &buf[64]; - zone_blocks = get_unaligned_be64(&rec[8]); - goto out; - } - - /* - * Check the size of all zones: all zones must be of - * equal size, except the last zone which can be smaller - * than other zones. - */ - do { - - /* Parse REPORT ZONES header */ - buflen = min_t(size_t, get_unaligned_be32(&buf[0]) + 64, - bufsize); - rec = buf + 64; - - /* Parse zone descriptors */ - while (rec < buf + buflen) { - u64 this_zone_blocks = get_unaligned_be64(&rec[8]); - - if (zone_blocks == 0) { - zone_blocks = this_zone_blocks; - } else if (this_zone_blocks != zone_blocks && - (block + this_zone_blocks < sdkp->capacity - || this_zone_blocks > zone_blocks)) { - zone_blocks = 0; - goto out; - } - block += this_zone_blocks; - rec += 64; - } - - if (block < sdkp->capacity) { - ret = sd_zbc_do_report_zones(sdkp, buf, bufsize, block, - true); - if (ret) - goto out_free; - } - - } while (block < sdkp->capacity); - -out: - if (!zone_blocks) { - if (sdkp->first_scan) - sd_printk(KERN_NOTICE, sdkp, - "Devices with non constant zone " - "size are not supported\n"); - ret = -ENODEV; - } else if (!is_power_of_2(zone_blocks)) { + /* Parse REPORT ZONES header */ + buflen = min_t(size_t, get_unaligned_be32(&buf[0]) + 64, SD_BUF_SIZE); + rec = buf + 64; + zone_blocks = get_unaligned_be64(&rec[8]); + if (!zone_blocks || !is_power_of_2(zone_blocks)) { if (sdkp->first_scan) sd_printk(KERN_NOTICE, sdkp, "Devices with non power of 2 zone " "size are not supported\n"); - ret = -ENODEV; - } else if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) { + return -ENODEV; + } + + if (logical_to_sectors(sdkp->device, zone_blocks) > UINT_MAX) { if (sdkp->first_scan) sd_printk(KERN_NOTICE, sdkp, "Zone size too large\n"); - ret = -EFBIG; - } else { - *zblocks = zone_blocks; - ret = 0; + return -EFBIG; } -out_free: - memalloc_noio_restore(noio_flag); - kvfree(buf); + *zblocks = zone_blocks; - return ret; + return 0; } int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf) @@ -480,7 +413,7 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf) * Check zone size: only devices with a constant zone size (except * an eventual last runt zone) that is a power of 2 are supported. */ - ret = sd_zbc_check_zones(sdkp, &zone_blocks); + ret = sd_zbc_check_zones(sdkp, buf, &zone_blocks); if (ret != 0) goto err;