linux-kernel - [PATCH 1/4] fs: proc: store PDE()->data into inode->i

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Message-Id: <20211101093518.86845-2-songmuchun@bytedance.com>
Date:   Mon,  1 Nov 2021 17:35:15 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     akpm@...ux-foundation.org, adobriyan@...il.com,
        gladkov.alexey@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Muchun Song <songmuchun@...edance.com>
Subject: [PATCH 1/4] 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.

Signed-off-by: Muchun Song <songmuchun@...edance.com>
---
 fs/proc/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 599eb724ff2d..f84355c5a36d 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -650,6 +650,7 @@ struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de)
 		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;
-- 
2.11.0