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Commit ad08978a authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

ipv6/flowlabel: simplify pid namespace lookup 



The code should be using the pid namespace from the procfs mount
instead of trying to look it up during open.

Suggested-by: default avatarEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 93cb5a1f

net/ipv6/ip6_flowlabel.c

+6 −23
Original line number Diff line number Diff line
@@ -754,6 +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);



	state->pid_ns = proc_pid_ns(file_inode(seq->file));



	rcu_read_lock_bh();

	return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;

}
@@ -810,36 +814,15 @@ 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)