From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C5A6C2D0DB for ; Thu, 23 Jan 2020 17:02:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C9A121569 for ; Thu, 23 Jan 2020 17:02:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729999AbgAWRCJ (ORCPT ); Thu, 23 Jan 2020 12:02:09 -0500 Received: from mx2.suse.de ([195.135.220.15]:51344 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730014AbgAWRCJ (ORCPT ); Thu, 23 Jan 2020 12:02:09 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 032D0AC50; Thu, 23 Jan 2020 17:02:07 +0000 (UTC) From: colyli@suse.de To: axboe@kernel.dk Cc: linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, Christoph Hellwig , Coly Li Subject: [PATCH 03/17] bcache: rework error unwinding in register_bcache Date: Fri, 24 Jan 2020 01:01:28 +0800 Message-Id: <20200123170142.98974-4-colyli@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20200123170142.98974-1-colyli@suse.de> References: <20200123170142.98974-1-colyli@suse.de> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Christoph Hellwig Split the successful and error return path, and use one goto label for each resource to unwind. This also fixes some small errors like leaking the module reference count in the reboot case (which seems entirely harmless) or printing the wrong warning messages for early failures. Signed-off-by: Christoph Hellwig Signed-off-by: Coly Li --- drivers/md/bcache/super.c | 75 ++++++++++++++++++++++++++++------------------- 1 file changed, 45 insertions(+), 30 deletions(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 3045f27e0d67..e8013e1b0a14 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -2375,29 +2375,33 @@ static bool bch_is_open(struct block_device *bdev) static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, const char *buffer, size_t size) { - ssize_t ret = -EINVAL; - const char *err = "cannot allocate memory"; - char *path = NULL; - struct cache_sb *sb = NULL; + const char *err; + char *path; + struct cache_sb *sb; struct block_device *bdev = NULL; - struct page *sb_page = NULL; + struct page *sb_page; + ssize_t ret; + ret = -EBUSY; if (!try_module_get(THIS_MODULE)) - return -EBUSY; + goto out; /* For latest state of bcache_is_reboot */ smp_mb(); if (bcache_is_reboot) - return -EBUSY; + goto out_module_put; + ret = -ENOMEM; + err = "cannot allocate memory"; path = kstrndup(buffer, size, GFP_KERNEL); if (!path) - goto err; + goto out_module_put; sb = kmalloc(sizeof(struct cache_sb), GFP_KERNEL); if (!sb) - goto err; + goto out_free_path; + ret = -EINVAL; err = "failed to open device"; bdev = blkdev_get_by_path(strim(path), FMODE_READ|FMODE_WRITE|FMODE_EXCL, @@ -2414,57 +2418,68 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, if (!IS_ERR(bdev)) bdput(bdev); if (attr == &ksysfs_register_quiet) - goto quiet_out; + goto done; } - goto err; + goto out_free_sb; } err = "failed to set blocksize"; if (set_blocksize(bdev, 4096)) - goto err_close; + goto out_blkdev_put; err = read_super(sb, bdev, &sb_page); if (err) - goto err_close; + goto out_blkdev_put; err = "failed to register device"; if (SB_IS_BDEV(sb)) { struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL); if (!dc) - goto err_close; + goto out_put_sb_page; mutex_lock(&bch_register_lock); ret = register_bdev(sb, sb_page, bdev, dc); mutex_unlock(&bch_register_lock); /* blkdev_put() will be called in cached_dev_free() */ - if (ret < 0) - goto err; + if (ret < 0) { + bdev = NULL; + goto out_put_sb_page; + } } else { struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL); if (!ca) - goto err_close; + goto out_put_sb_page; /* blkdev_put() will be called in bch_cache_release() */ - if (register_cache(sb, sb_page, bdev, ca) != 0) - goto err; + if (register_cache(sb, sb_page, bdev, ca) != 0) { + bdev = NULL; + goto out_put_sb_page; + } } -quiet_out: - ret = size; -out: - if (sb_page) - put_page(sb_page); + + put_page(sb_page); +done: kfree(sb); kfree(path); module_put(THIS_MODULE); - return ret; - -err_close: - blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); -err: + return size; + +out_put_sb_page: + put_page(sb_page); +out_blkdev_put: + if (bdev) + blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); +out_free_sb: + kfree(sb); +out_free_path: + kfree(path); +out_module_put: + module_put(THIS_MODULE); +out: pr_info("error %s: %s", path, err); - goto out; + return ret; } -- 2.16.4