From patchwork Tue Feb 23 09:28:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 386648 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, URIBL_BLOCKED, 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 99AD4C433E0 for ; Tue, 23 Feb 2021 09:31:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4ACCE64E58 for ; Tue, 23 Feb 2021 09:31:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231274AbhBWJbd (ORCPT ); Tue, 23 Feb 2021 04:31:33 -0500 Received: from out30-54.freemail.mail.aliyun.com ([115.124.30.54]:53574 "EHLO out30-54.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231688AbhBWJ3n (ORCPT ); Tue, 23 Feb 2021 04:29:43 -0500 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R111e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04400; MF=jefflexu@linux.alibaba.com; NM=1; PH=DS; RN=6; SR=0; TI=SMTPD_---0UPLlpEN_1614072540; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0UPLlpEN_1614072540) by smtp.aliyun-inc.com(127.0.0.1); Tue, 23 Feb 2021 17:29:01 +0800 From: Jeffle Xu To: gregkh@linuxfoundation.org, sashal@kernel.org Cc: stable@vger.kernel.org, joseph.qi@linux.alibaba.com, jefflexu@linux.alibaba.com, hare@suse.com Subject: [PATCH v2 4.19 1/6] Revert "zram: close udev startup race condition as default groups" Date: Tue, 23 Feb 2021 17:28:54 +0800 Message-Id: <20210223092859.17033-2-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210223092859.17033-1-jefflexu@linux.alibaba.com> References: <20210223092859.17033-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This reverts commit 9e07f4e243791e00a4086ad86e573705cf7b2c65. The original commit is actually a "merged" fix of [1] and [2], as described in [3]. Since now we have more fixes that rely on [1], revert this commit first, and then get the original [1] and [2] merged. [1] fef912bf860e, block: genhd: add 'groups' argument to device_add_disk [2] 98af4d4df889, zram: register default groups with device_add_disk() [3] https://www.spinics.net/lists/stable/msg442196.html Signed-off-by: Jeffle Xu --- drivers/block/zram/zram_drv.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 52850c10165e..dfc53619dcdd 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1644,11 +1644,6 @@ static const struct attribute_group zram_disk_attr_group = { .attrs = zram_disk_attrs, }; -static const struct attribute_group *zram_disk_attr_groups[] = { - &zram_disk_attr_group, - NULL, -}; - /* * Allocate and initialize new zram device. the function returns * '>= 0' device_id upon success, and negative value otherwise. @@ -1729,15 +1724,24 @@ static int zram_add(void) zram->disk->queue->backing_dev_info->capabilities |= (BDI_CAP_STABLE_WRITES | BDI_CAP_SYNCHRONOUS_IO); - disk_to_dev(zram->disk)->groups = zram_disk_attr_groups; add_disk(zram->disk); + ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj, + &zram_disk_attr_group); + if (ret < 0) { + pr_err("Error creating sysfs group for device %d\n", + device_id); + goto out_free_disk; + } strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor)); zram_debugfs_register(zram); pr_info("Added device: %s\n", zram->disk->disk_name); return device_id; +out_free_disk: + del_gendisk(zram->disk); + put_disk(zram->disk); out_free_queue: blk_cleanup_queue(queue); out_free_idr: @@ -1766,6 +1770,16 @@ static int zram_remove(struct zram *zram) mutex_unlock(&bdev->bd_mutex); zram_debugfs_unregister(zram); + /* + * Remove sysfs first, so no one will perform a disksize + * store while we destroy the devices. This also helps during + * hot_remove -- zram_reset_device() is the last holder of + * ->init_lock, no later/concurrent disksize_store() or any + * other sysfs handlers are possible. + */ + sysfs_remove_group(&disk_to_dev(zram->disk)->kobj, + &zram_disk_attr_group); + /* Make sure all the pending I/O are finished */ fsync_bdev(bdev); zram_reset_device(zram); From patchwork Tue Feb 23 09:28:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 386647 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, URIBL_BLOCKED, 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 D2FD4C433E0 for ; Tue, 23 Feb 2021 09:32:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6956364E21 for ; Tue, 23 Feb 2021 09:32:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231313AbhBWJcA (ORCPT ); Tue, 23 Feb 2021 04:32:00 -0500 Received: from out30-43.freemail.mail.aliyun.com ([115.124.30.43]:40765 "EHLO out30-43.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232252AbhBWJ3r (ORCPT ); Tue, 23 Feb 2021 04:29:47 -0500 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R171e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=alimailimapcm10staff010182156082; MF=jefflexu@linux.alibaba.com; NM=1; PH=DS; RN=6; SR=0; TI=SMTPD_---0UPMP7ZL_1614072544; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0UPMP7ZL_1614072544) by smtp.aliyun-inc.com(127.0.0.1); Tue, 23 Feb 2021 17:29:04 +0800 From: Jeffle Xu To: gregkh@linuxfoundation.org, sashal@kernel.org Cc: stable@vger.kernel.org, joseph.qi@linux.alibaba.com, jefflexu@linux.alibaba.com, hare@suse.com Subject: [PATCH v2 4.19 4/6] aoe: register default groups with device_add_disk() Date: Tue, 23 Feb 2021 17:28:57 +0800 Message-Id: <20210223092859.17033-5-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210223092859.17033-1-jefflexu@linux.alibaba.com> References: <20210223092859.17033-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Hannes Reinecke commit 95cf7809bf9169fec4e4b7bb24b8069d8f354f96 upstream. Register default sysfs groups during device_add_disk() to avoid a race condition with udev during startup. Signed-off-by: Hannes Reinecke Reviewed-by: Christoph Hellwig Acked-by: Ed L. Cachin Reviewed-by: Bart Van Assche Signed-off-by: Jens Axboe Signed-off-by: Jeffle Xu --- drivers/block/aoe/aoe.h | 1 - drivers/block/aoe/aoeblk.c | 21 +++++++-------------- drivers/block/aoe/aoedev.c | 1 - 3 files changed, 7 insertions(+), 16 deletions(-) diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index c0ebda1283cc..015c68017a1c 100644 --- a/drivers/block/aoe/aoe.h +++ b/drivers/block/aoe/aoe.h @@ -201,7 +201,6 @@ int aoeblk_init(void); void aoeblk_exit(void); void aoeblk_gdalloc(void *); void aoedisk_rm_debugfs(struct aoedev *d); -void aoedisk_rm_sysfs(struct aoedev *d); int aoechr_init(void); void aoechr_exit(void); diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c index 429ebb84b592..ff770e7d9e52 100644 --- a/drivers/block/aoe/aoeblk.c +++ b/drivers/block/aoe/aoeblk.c @@ -177,10 +177,15 @@ static struct attribute *aoe_attrs[] = { NULL, }; -static const struct attribute_group attr_group = { +static const struct attribute_group aoe_attr_group = { .attrs = aoe_attrs, }; +static const struct attribute_group *aoe_attr_groups[] = { + &aoe_attr_group, + NULL, +}; + static const struct file_operations aoe_debugfs_fops = { .open = aoe_debugfs_open, .read = seq_read, @@ -219,17 +224,6 @@ aoedisk_rm_debugfs(struct aoedev *d) d->debugfs = NULL; } -static int -aoedisk_add_sysfs(struct aoedev *d) -{ - return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group); -} -void -aoedisk_rm_sysfs(struct aoedev *d) -{ - sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group); -} - static int aoeblk_open(struct block_device *bdev, fmode_t mode) { @@ -417,8 +411,7 @@ aoeblk_gdalloc(void *vp) spin_unlock_irqrestore(&d->lock, flags); - add_disk(gd); - aoedisk_add_sysfs(d); + device_add_disk(NULL, gd, aoe_attr_groups); aoedisk_add_debugfs(d); spin_lock_irqsave(&d->lock, flags); diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c index 41060e9cedf2..f29a140cdbc1 100644 --- a/drivers/block/aoe/aoedev.c +++ b/drivers/block/aoe/aoedev.c @@ -275,7 +275,6 @@ freedev(struct aoedev *d) del_timer_sync(&d->timer); if (d->gd) { aoedisk_rm_debugfs(d); - aoedisk_rm_sysfs(d); del_gendisk(d->gd); put_disk(d->gd); blk_cleanup_queue(d->blkq); From patchwork Tue Feb 23 09:28:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jingbo Xu X-Patchwork-Id: 386646 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, URIBL_BLOCKED, 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 6E543C43381 for ; Tue, 23 Feb 2021 09:32:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E56664E21 for ; Tue, 23 Feb 2021 09:32:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232133AbhBWJcI (ORCPT ); Tue, 23 Feb 2021 04:32:08 -0500 Received: from out30-54.freemail.mail.aliyun.com ([115.124.30.54]:51586 "EHLO out30-54.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232342AbhBWJ3t (ORCPT ); Tue, 23 Feb 2021 04:29:49 -0500 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R101e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04394; MF=jefflexu@linux.alibaba.com; NM=1; PH=DS; RN=6; SR=0; TI=SMTPD_---0UPMP7ZV_1614072545; Received: from localhost(mailfrom:jefflexu@linux.alibaba.com fp:SMTPD_---0UPMP7ZV_1614072545) by smtp.aliyun-inc.com(127.0.0.1); Tue, 23 Feb 2021 17:29:05 +0800 From: Jeffle Xu To: gregkh@linuxfoundation.org, sashal@kernel.org Cc: stable@vger.kernel.org, joseph.qi@linux.alibaba.com, jefflexu@linux.alibaba.com, hare@suse.com Subject: [PATCH v2 4.19 5/6] zram: register default groups with device_add_disk() Date: Tue, 23 Feb 2021 17:28:58 +0800 Message-Id: <20210223092859.17033-6-jefflexu@linux.alibaba.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210223092859.17033-1-jefflexu@linux.alibaba.com> References: <20210223092859.17033-1-jefflexu@linux.alibaba.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Hannes Reinecke commit 98af4d4df889dcea3bc0ce6b8a04759658ba8826 upstream. Register default sysfs groups during device_add_disk() to avoid a race condition with udev during startup. Signed-off-by: Hannes Reinecke Cc: Minchan Kim Cc: Nitin Gupta Reviewed-by: Christoph Hellwig Reviewed-by: Bart Van Assche Signed-off-by: Jens Axboe Signed-off-by: Jeffle Xu --- drivers/block/zram/zram_drv.c | 28 +++++++--------------------- 1 file changed, 7 insertions(+), 21 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index dfc53619dcdd..b32da655ec30 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1644,6 +1644,11 @@ static const struct attribute_group zram_disk_attr_group = { .attrs = zram_disk_attrs, }; +static const struct attribute_group *zram_disk_attr_groups[] = { + &zram_disk_attr_group, + NULL, +}; + /* * Allocate and initialize new zram device. the function returns * '>= 0' device_id upon success, and negative value otherwise. @@ -1724,24 +1729,14 @@ static int zram_add(void) zram->disk->queue->backing_dev_info->capabilities |= (BDI_CAP_STABLE_WRITES | BDI_CAP_SYNCHRONOUS_IO); - add_disk(zram->disk); - - ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj, - &zram_disk_attr_group); - if (ret < 0) { - pr_err("Error creating sysfs group for device %d\n", - device_id); - goto out_free_disk; - } + device_add_disk(NULL, zram->disk, zram_disk_attr_groups); + strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor)); zram_debugfs_register(zram); pr_info("Added device: %s\n", zram->disk->disk_name); return device_id; -out_free_disk: - del_gendisk(zram->disk); - put_disk(zram->disk); out_free_queue: blk_cleanup_queue(queue); out_free_idr: @@ -1770,15 +1765,6 @@ static int zram_remove(struct zram *zram) mutex_unlock(&bdev->bd_mutex); zram_debugfs_unregister(zram); - /* - * Remove sysfs first, so no one will perform a disksize - * store while we destroy the devices. This also helps during - * hot_remove -- zram_reset_device() is the last holder of - * ->init_lock, no later/concurrent disksize_store() or any - * other sysfs handlers are possible. - */ - sysfs_remove_group(&disk_to_dev(zram->disk)->kobj, - &zram_disk_attr_group); /* Make sure all the pending I/O are finished */ fsync_bdev(bdev);