From patchwork Sat Jul 25 12:00:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Coly Li X-Patchwork-Id: 11684979 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 0491B913 for ; Sat, 25 Jul 2020 12:03:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB4FB20714 for ; Sat, 25 Jul 2020 12:03:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727013AbgGYMDD (ORCPT ); Sat, 25 Jul 2020 08:03:03 -0400 Received: from mx2.suse.de ([195.135.220.15]:52300 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726997AbgGYMDD (ORCPT ); Sat, 25 Jul 2020 08:03:03 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 96049AB55; Sat, 25 Jul 2020 12:03:09 +0000 (UTC) From: Coly Li To: axboe@kernel.dk Cc: linux-block@vger.kernel.org, linux-bcache@vger.kernel.org, Coly Li Subject: [PATCH 09/25] bcache: add read_super_common() to read major part of super block Date: Sat, 25 Jul 2020 20:00:23 +0800 Message-Id: <20200725120039.91071-10-colyli@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200725120039.91071-1-colyli@suse.de> References: <20200725120039.91071-1-colyli@suse.de> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Later patches will introduce feature set bits to on-disk super block and increase super block version. Current code in read_super() which reads common part of super block for version BCACHE_SB_VERSION_CDEV and version BCACHE_SB_VERSION_CDEV_WITH_UUID will be shared with the new version. Therefore this patch moves the reusable part into read_super_common(), this preparation patch will make later patches more simplier and only focus on new feature set bits. Signed-off-by: Coly Li --- drivers/md/bcache/super.c | 111 +++++++++++++++++++++----------------- 1 file changed, 63 insertions(+), 48 deletions(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 05ad1cd9f329..b5b81b92b2ef 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -59,6 +59,67 @@ struct workqueue_struct *bch_journal_wq; /* Superblock */ +static const char *read_super_common(struct cache_sb *sb, struct block_device *bdev, + struct cache_sb_disk *s) +{ + const char *err; + unsigned int i; + + sb->nbuckets = le64_to_cpu(s->nbuckets); + sb->bucket_size = le16_to_cpu(s->bucket_size); + + sb->nr_in_set = le16_to_cpu(s->nr_in_set); + sb->nr_this_dev = le16_to_cpu(s->nr_this_dev); + + err = "Too many buckets"; + if (sb->nbuckets > LONG_MAX) + goto err; + + err = "Not enough buckets"; + if (sb->nbuckets < 1 << 7) + goto err; + + err = "Bad block/bucket size"; + if (!is_power_of_2(sb->block_size) || + sb->block_size > PAGE_SECTORS || + !is_power_of_2(sb->bucket_size) || + sb->bucket_size < PAGE_SECTORS) + goto err; + + err = "Invalid superblock: device too small"; + if (get_capacity(bdev->bd_disk) < + sb->bucket_size * sb->nbuckets) + goto err; + + err = "Bad UUID"; + if (bch_is_zero(sb->set_uuid, 16)) + goto err; + + err = "Bad cache device number in set"; + if (!sb->nr_in_set || + sb->nr_in_set <= sb->nr_this_dev || + sb->nr_in_set > MAX_CACHES_PER_SET) + goto err; + + err = "Journal buckets not sequential"; + for (i = 0; i < sb->keys; i++) + if (sb->d[i] != sb->first_bucket + i) + goto err; + + err = "Too many journal buckets"; + if (sb->first_bucket + sb->keys > sb->nbuckets) + goto err; + + err = "Invalid superblock: first bucket comes before end of super"; + if (sb->first_bucket * sb->bucket_size < 16) + goto err; + + err = NULL; +err: + return err; +} + + static const char *read_super(struct cache_sb *sb, struct block_device *bdev, struct cache_sb_disk **res) { @@ -133,55 +194,9 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev, break; case BCACHE_SB_VERSION_CDEV: case BCACHE_SB_VERSION_CDEV_WITH_UUID: - sb->nbuckets = le64_to_cpu(s->nbuckets); - sb->bucket_size = le16_to_cpu(s->bucket_size); - - sb->nr_in_set = le16_to_cpu(s->nr_in_set); - sb->nr_this_dev = le16_to_cpu(s->nr_this_dev); - - err = "Too many buckets"; - if (sb->nbuckets > LONG_MAX) - goto err; - - err = "Not enough buckets"; - if (sb->nbuckets < 1 << 7) - goto err; - - err = "Bad block/bucket size"; - if (!is_power_of_2(sb->block_size) || - sb->block_size > PAGE_SECTORS || - !is_power_of_2(sb->bucket_size) || - sb->bucket_size < PAGE_SECTORS) - goto err; - - err = "Invalid superblock: device too small"; - if (get_capacity(bdev->bd_disk) < - sb->bucket_size * sb->nbuckets) - goto err; - - err = "Bad UUID"; - if (bch_is_zero(sb->set_uuid, 16)) - goto err; - - err = "Bad cache device number in set"; - if (!sb->nr_in_set || - sb->nr_in_set <= sb->nr_this_dev || - sb->nr_in_set > MAX_CACHES_PER_SET) - goto err; - - err = "Journal buckets not sequential"; - for (i = 0; i < sb->keys; i++) - if (sb->d[i] != sb->first_bucket + i) - goto err; - - err = "Too many journal buckets"; - if (sb->first_bucket + sb->keys > sb->nbuckets) - goto err; - - err = "Invalid superblock: first bucket comes before end of super"; - if (sb->first_bucket * sb->bucket_size < 16) + err = read_super_common(sb, bdev, s); + if (err) goto err; - break; default: err = "Unsupported superblock version";