linux-kernel - [PATCH 01/02] net: Export get_proc

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Date:   Fri, 20 Apr 2018 13:31:28 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     dhowells@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-afs@...ts.infradead.org,
        netdev@...r.kernel.org, Alexey Dobriyan <adobriyan@...il.com>
Subject: [PATCH 01/02] net: Export get_proc_net()

Export get_proc_net() so that write() routines attached to net-namespaced
proc files can find the network namespace that they're in.  Currently, this
is only accessible via seqfile routines.
    
This will permit AFS to have a separate cell database per-network namespace
and to manage each one independently of the others.
    
Signed-off-by: David Howells <dhowells@...hat.com>
---
 fs/proc/proc_net.c      |    3 ++-
 include/linux/proc_fs.h |    2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 1763f370489d..23d56146e38f 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -33,10 +33,11 @@ static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 	return pde->parent->data;
 }
 
-static struct net *get_proc_net(const struct inode *inode)
+struct net *get_proc_net(const struct inode *inode)
 {
 	return maybe_get_net(PDE_NET(PDE(inode)));
 }
+EXPORT_SYMBOL_GPL(get_proc_net);
 
 int seq_open_net(struct inode *ino, struct file *f,
 		 const struct seq_operations *ops, int size)
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 928ef9e4d912..47a87121d30c 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -79,6 +79,8 @@ static inline struct proc_dir_entry *proc_net_mkdir(
 	return proc_mkdir_data(name, 0, parent, net);
 }
 
+extern struct net *get_proc_net(const struct inode *inode);
+
 struct ns_common;
 int open_related_ns(struct ns_common *ns,
 		   struct ns_common *(*get_ns)(struct ns_common *ns));