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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id BAC17C433F5 for ; Sat, 22 Jan 2022 06:14:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 502B46B00DE; Sat, 22 Jan 2022 01:14:24 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 4B1D56B00DF; Sat, 22 Jan 2022 01:14:24 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3C8796B00E0; Sat, 22 Jan 2022 01:14:24 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0152.hostedemail.com [216.40.44.152]) by kanga.kvack.org (Postfix) with ESMTP id 2B27E6B00DE for ; Sat, 22 Jan 2022 01:14:24 -0500 (EST) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id E80E196F28 for ; Sat, 22 Jan 2022 06:14:23 +0000 (UTC) X-FDA: 79056908406.27.1C5E2AC Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by imf16.hostedemail.com (Postfix) with ESMTP id 45BDF180009 for ; Sat, 22 Jan 2022 06:14:23 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 4CD71B820FD; Sat, 22 Jan 2022 06:14:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA266C004E1; Sat, 22 Jan 2022 06:14:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1642832061; bh=FwOaahKxnLQfUoTS7NSSqTh8/NdIS5m4lBZ7wtW3vUs=; h=Date:From:To:Subject:In-Reply-To:From; b=bqLbufOVSLND9KPzG7gck6I8tslgWttpL7Ow/fZLuatf1JOE5D+iR8GJI9OftTIkf /WNdzBAClcEGp19BX2nMLrmlFufXckiTlZhbH/t2TyfKRLbrK0qkmAnbj3LCsKsxmG n0JSyAZ77PsChat8WaL0YM2CjxkBC7JZNtHOxzLs= Date: Fri, 21 Jan 2022 22:14:20 -0800 From: Andrew Morton To: adobriyan@gmail.com, akpm@linux-foundation.org, christian.brauner@ubuntu.com, gladkov.alexey@gmail.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, songmuchun@bytedance.com, torvalds@linux-foundation.org Subject: [patch 53/69] fs: proc: store PDE()->data into inode->i_private Message-ID: <20220122061420.re6CYbW_S%akpm@linux-foundation.org> In-Reply-To: <20220121221021.60533b009c357d660791476e@linux-foundation.org> User-Agent: s-nail v14.8.16 Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=bqLbufOV; spf=pass (imf16.hostedemail.com: domain of akpm@linux-foundation.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 45BDF180009 X-Stat-Signature: ndbygcr4q1kgogocp7g8766tnzakui76 X-HE-Tag: 1642832063-851464 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Muchun Song Subject: fs: proc: store PDE()->data into inode->i_private PDE_DATA(inode) is introduced to get user private data and hide the layout of struct proc_dir_entry. The inode->i_private is used to do the same thing as well. Save a copy of user private data to inode-> i_private when proc inode is allocated. This means the user also can get their private data by inode->i_private. Introduce pde_data() to wrap inode->i_private so that we can remove PDE_DATA() from fs/proc/generic.c and make PTE_DATE() as a wrapper of pde_data(). It will be easier if we decide to remove PDE_DATE() in the future. Link: https://lkml.kernel.org/r/20211124081956.87711-1-songmuchun@bytedance.com Signed-off-by: Muchun Song Acked-by: Christian Brauner Cc: Alexey Dobriyan Cc: Alexey Gladkov Signed-off-by: Andrew Morton --- fs/proc/generic.c | 6 ------ fs/proc/inode.c | 1 + fs/proc/internal.h | 5 ----- include/linux/proc_fs.h | 13 ++++++++++++- 4 files changed, 13 insertions(+), 12 deletions(-) --- a/fs/proc/generic.c~fs-proc-store-pde-data-into-inode-i_private +++ a/fs/proc/generic.c @@ -791,12 +791,6 @@ void proc_remove(struct proc_dir_entry * } EXPORT_SYMBOL(proc_remove); -void *PDE_DATA(const struct inode *inode) -{ - return __PDE_DATA(inode); -} -EXPORT_SYMBOL(PDE_DATA); - /* * Pull a user buffer into memory and pass it to the file's write handler if * one is supplied. The ->write() method is permitted to modify the --- a/fs/proc/inode.c~fs-proc-store-pde-data-into-inode-i_private +++ a/fs/proc/inode.c @@ -650,6 +650,7 @@ struct inode *proc_get_inode(struct supe return NULL; } + inode->i_private = de->data; inode->i_ino = de->low_ino; inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); PROC_I(inode)->pde = de; --- a/fs/proc/internal.h~fs-proc-store-pde-data-into-inode-i_private +++ a/fs/proc/internal.h @@ -115,11 +115,6 @@ static inline struct proc_dir_entry *PDE return PROC_I(inode)->pde; } -static inline void *__PDE_DATA(const struct inode *inode) -{ - return PDE(inode)->data; -} - static inline struct pid *proc_pid(const struct inode *inode) { return PROC_I(inode)->pid; --- a/include/linux/proc_fs.h~fs-proc-store-pde-data-into-inode-i_private +++ a/include/linux/proc_fs.h @@ -110,7 +110,18 @@ extern struct proc_dir_entry *proc_creat struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry *parent, const struct proc_ops *proc_ops); extern void proc_set_size(struct proc_dir_entry *, loff_t); extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t); -extern void *PDE_DATA(const struct inode *); + +/* + * Obtain the private data passed by user through proc_create_data() or + * related. + */ +static inline void *pde_data(const struct inode *inode) +{ + return inode->i_private; +} + +#define PDE_DATA(i) pde_data(i) + extern void *proc_get_parent_data(const struct inode *); extern void proc_remove(struct proc_dir_entry *); extern void remove_proc_entry(const char *, struct proc_dir_entry *); _