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=-10.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 1C1C5C06510 for ; Tue, 2 Jul 2019 13:24:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EF5BD2146F for ; Tue, 2 Jul 2019 13:24:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727144AbfGBNYA (ORCPT ); Tue, 2 Jul 2019 09:24:00 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:40946 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727086AbfGBNXx (ORCPT ); Tue, 2 Jul 2019 09:23:53 -0400 Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 8185FB2B9D1B45AE75A8; Tue, 2 Jul 2019 21:23:49 +0800 (CST) Received: from huawei.com (10.90.53.225) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.439.0; Tue, 2 Jul 2019 21:23:41 +0800 From: Hou Tao To: , CC: , , , , , , Subject: [RFC PATCH 1/3] md-debugfs: add md_debugfs_create_files() Date: Tue, 2 Jul 2019 21:29:16 +0800 Message-ID: <20190702132918.114818-2-houtao1@huawei.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190702132918.114818-1-houtao1@huawei.com> References: <20190702132918.114818-1-houtao1@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.90.53.225] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It will be used by the following patches to create debugfs files under /sys/kernel/debug/mdX. Signed-off-by: Hou Tao --- drivers/md/Makefile | 2 +- drivers/md/md-debugfs.c | 35 +++++++++++++++++++++++++++++++++++ drivers/md/md-debugfs.h | 16 ++++++++++++++++ 3 files changed, 52 insertions(+), 1 deletion(-) create mode 100644 drivers/md/md-debugfs.c create mode 100644 drivers/md/md-debugfs.h diff --git a/drivers/md/Makefile b/drivers/md/Makefile index be7a6eb92abc..49355e3b4cce 100644 --- a/drivers/md/Makefile +++ b/drivers/md/Makefile @@ -19,7 +19,7 @@ dm-cache-y += dm-cache-target.o dm-cache-metadata.o dm-cache-policy.o \ dm-cache-smq-y += dm-cache-policy-smq.o dm-era-y += dm-era-target.o dm-verity-y += dm-verity-target.o -md-mod-y += md.o md-bitmap.o +md-mod-y += md.o md-bitmap.o md-debugfs.o raid456-y += raid5.o raid5-cache.o raid5-ppl.o dm-zoned-y += dm-zoned-target.o dm-zoned-metadata.o dm-zoned-reclaim.o linear-y += md-linear.o diff --git a/drivers/md/md-debugfs.c b/drivers/md/md-debugfs.c new file mode 100644 index 000000000000..318c35fed24f --- /dev/null +++ b/drivers/md/md-debugfs.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Based on debugfs_create_files() in blk-mq */ + +#include +#include + +#include "md-debugfs.h" + +static int md_debugfs_open(struct inode *inode, struct file *file) +{ + const struct md_debugfs_file *dbg_file = inode->i_private; + void *data = d_inode(file_dentry(file)->d_parent)->i_private; + + return single_open(file, dbg_file->show, data); +} + +static const struct file_operations md_debugfs_fops = { + .owner = THIS_MODULE, + .open = md_debugfs_open, + .llseek = seq_lseek, + .read = seq_read, + .release = single_release, +}; + +void md_debugfs_create_files(struct dentry *parent, void *data, + const struct md_debugfs_file *files) +{ + const struct md_debugfs_file *file; + + d_inode(parent)->i_private = data; + + for (file = files; file->name; file++) + debugfs_create_file(file->name, 0444, parent, + (void *)file, &md_debugfs_fops); +} diff --git a/drivers/md/md-debugfs.h b/drivers/md/md-debugfs.h new file mode 100644 index 000000000000..13b581d4ab63 --- /dev/null +++ b/drivers/md/md-debugfs.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _MD_DEBUGFS_H +#define _MD_DEBUGFS_H + +#include +#include + +struct md_debugfs_file { + const char *name; + int (*show)(struct seq_file *m, void *data); +}; + +extern void md_debugfs_create_files(struct dentry *parent, void *data, + const struct md_debugfs_file *files); +#endif -- 2.22.0