linux-kernel - [PATCH 4.19 3/7] proc: Rename in proc_inode rename sysctl_inodes sibling

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Message-Id: <20210107075314.62683-4-wenyang@linux.alibaba.com>
Date:   Thu,  7 Jan 2021 15:53:10 +0800
From:   Wen Yang <wenyang@...ux.alibaba.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Cc:     Xunlei Pang <xlpang@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        stable@...r.kernel.org, Wen Yang <wenyang@...ux.alibaba.com>
Subject: [PATCH 4.19 3/7] proc: Rename in proc_inode rename sysctl_inodes sibling_inodes

From: "Eric W. Biederman" <ebiederm@...ssion.com>

[ Upstream commit 0afa5ca82212247456f9de1468b595a111fee633 ]

I about to need and use the same functionality for pid based
inodes and there is no point in adding a second field when
this field is already here and serving the same purporse.

Just give the field a generic name so it is clear that
it is no longer sysctl specific.

Also for good measure initialize sibling_inodes when
proc_inode is initialized.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
Cc: <stable@...r.kernel.org> # 4.19.x
Signed-off-by: Wen Yang <wenyang@...ux.alibaba.com>
---
 fs/proc/inode.c       | 1 +
 fs/proc/internal.h    | 2 +-
 fs/proc/proc_sysctl.c | 8 ++++----
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 31bf3bb..e5334ed 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -70,6 +70,7 @@ static struct inode *proc_alloc_inode(struct super_block *sb)
 	ei->pde = NULL;
 	ei->sysctl = NULL;
 	ei->sysctl_entry = NULL;
+	INIT_HLIST_NODE(&ei->sibling_inodes);
 	ei->ns_ops = NULL;
 	inode = &ei->vfs_inode;
 	return inode;
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 95b1419..d922c01 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -91,7 +91,7 @@ struct proc_inode {
 	struct proc_dir_entry *pde;
 	struct ctl_table_header *sysctl;
 	struct ctl_table *sysctl_entry;
-	struct hlist_node sysctl_inodes;
+	struct hlist_node sibling_inodes;
 	const struct proc_ns_operations *ns_ops;
 	struct inode vfs_inode;
 } __randomize_layout;
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index c95f32b..0f578f6 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -274,9 +274,9 @@ static void proc_sys_prune_dcache(struct ctl_table_header *head)
 		node = hlist_first_rcu(&head->inodes);
 		if (!node)
 			break;
-		ei = hlist_entry(node, struct proc_inode, sysctl_inodes);
+		ei = hlist_entry(node, struct proc_inode, sibling_inodes);
 		spin_lock(&sysctl_lock);
-		hlist_del_init_rcu(&ei->sysctl_inodes);
+		hlist_del_init_rcu(&ei->sibling_inodes);
 		spin_unlock(&sysctl_lock);
 
 		inode = &ei->vfs_inode;
@@ -478,7 +478,7 @@ static struct inode *proc_sys_make_inode(struct super_block *sb,
 	}
 	ei->sysctl = head;
 	ei->sysctl_entry = table;
-	hlist_add_head_rcu(&ei->sysctl_inodes, &head->inodes);
+	hlist_add_head_rcu(&ei->sibling_inodes, &head->inodes);
 	head->count++;
 	spin_unlock(&sysctl_lock);
 
@@ -509,7 +509,7 @@ static struct inode *proc_sys_make_inode(struct super_block *sb,
 void proc_sys_evict_inode(struct inode *inode, struct ctl_table_header *head)
 {
 	spin_lock(&sysctl_lock);
-	hlist_del_init_rcu(&PROC_I(inode)->sysctl_inodes);
+	hlist_del_init_rcu(&PROC_I(inode)->sibling_inodes);
 	if (!--head->count)
 		kfree_rcu(head, rcu);
 	spin_unlock(&sysctl_lock);
-- 
1.8.3.1