linux-ext4 - [PATCH 09/39] ipv6/flowlabel: simplify pid namespace lookup

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Date:   Thu, 19 Apr 2018 14:41:10 +0200
From:   Christoph Hellwig <hch@....de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Corey Minyard <minyard@....org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-acpi@...r.kernel.org, drbd-dev@...ts.linbit.com,
        linux-ide@...r.kernel.org, netdev@...r.kernel.org,
        linux-rtc@...r.kernel.org, megaraidlinux.pdl@...adcom.com,
        linux-scsi@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-afs@...ts.infradead.org, linux-ext4@...r.kernel.org,
        jfs-discussion@...ts.sourceforge.net,
        netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 09/39] ipv6/flowlabel: simplify pid namespace lookup

The shole seq_file sequence already operates under a single RCU lock pair,
so move the pid namespace lookup into it, and stop grabbing a reference
and remove all kinds of boilerplate code.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 net/ipv6/ip6_flowlabel.c | 28 +++++-----------------------
 1 file changed, 5 insertions(+), 23 deletions(-)

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index c05c4e82a7ca..a9f221d45ef9 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -754,7 +754,10 @@ static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
 	__acquires(RCU)
 {
+	struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
+
 	rcu_read_lock_bh();
+	state->pid_ns = task_active_pid_ns(current);
 	return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 }
 
@@ -810,36 +813,15 @@ static const struct seq_operations ip6fl_seq_ops = {
 
 static int ip6fl_seq_open(struct inode *inode, struct file *file)
 {
-	struct seq_file *seq;
-	struct ip6fl_iter_state *state;
-	int err;
-
-	err = seq_open_net(inode, file, &ip6fl_seq_ops,
+	return seq_open_net(inode, file, &ip6fl_seq_ops,
 			   sizeof(struct ip6fl_iter_state));
-
-	if (!err) {
-		seq = file->private_data;
-		state = ip6fl_seq_private(seq);
-		rcu_read_lock();
-		state->pid_ns = get_pid_ns(task_active_pid_ns(current));
-		rcu_read_unlock();
-	}
-	return err;
-}
-
-static int ip6fl_seq_release(struct inode *inode, struct file *file)
-{
-	struct seq_file *seq = file->private_data;
-	struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
-	put_pid_ns(state->pid_ns);
-	return seq_release_net(inode, file);
 }
 
 static const struct file_operations ip6fl_seq_fops = {
 	.open		=	ip6fl_seq_open,
 	.read		=	seq_read,
 	.llseek		=	seq_lseek,
-	.release	=	ip6fl_seq_release,
+	.release	=	seq_release_net,
 };
 
 static int __net_init ip6_flowlabel_proc_init(struct net *net)
-- 
2.17.0