On Sun, 01 Dec 2013 05:14:43 -0800
Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> Make sure every network namespace has an rpc_pipefs mount available.
> This makes creating a pipes a heck lot easier.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> include/linux/sunrpc/rpc_pipe_fs.h | 1 -
> net/sunrpc/netns.h | 4 ++++
> net/sunrpc/rpc_pipe.c | 14 +++++++++++++-
> net/sunrpc/sunrpc_syms.c | 8 +++++++-
> 4 files changed, 24 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
> index a353e03..d5807e7 100644
> --- a/include/linux/sunrpc/rpc_pipe_fs.h
> +++ b/include/linux/sunrpc/rpc_pipe_fs.h
> @@ -84,7 +84,6 @@ enum {
>
> extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
> const unsigned char *dir_name);
> -extern void rpc_pipefs_init_net(struct net *net);
> extern struct super_block *rpc_get_sb_net(const struct net *net);
> extern void rpc_put_sb_net(const struct net *net);
>
> diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h
> index 779742c..a80b069 100644
> --- a/net/sunrpc/netns.h
> +++ b/net/sunrpc/netns.h
> @@ -13,6 +13,7 @@ struct sunrpc_net {
> struct cache_detail *rsc_cache;
> struct cache_detail *rsi_cache;
>
> + struct vfsmount *pipefs_mnt;
> struct super_block *pipefs_sb;
> struct mutex pipefs_sb_lock;
>
> @@ -41,4 +42,7 @@ extern int sunrpc_net_id;
> int ip_map_cache_create(struct net *);
> void ip_map_cache_destroy(struct net *);
>
> +extern int rpc_pipefs_init_net(struct net *net);
> +extern void rpc_pipefs_exit_net(struct net *net);
> +
> #endif
> diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
> index 395eb5f..e654b65 100644
> --- a/net/sunrpc/rpc_pipe.c
> +++ b/net/sunrpc/rpc_pipe.c
> @@ -1203,13 +1203,25 @@ struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
> }
> EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
>
> -void rpc_pipefs_init_net(struct net *net)
> +int rpc_pipefs_init_net(struct net *net)
> {
> struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
>
> mutex_init(&sn->pipefs_sb_lock);
> sn->gssd_running = 1;
> sn->pipe_version = -1;
> +
> + sn->pipefs_mnt = kern_mount(&rpc_pipe_fs_type);
> + if (IS_ERR(sn->pipefs_mnt))
> + return PTR_ERR(sn->pipefs_mnt);
> + return 0;
> +}
> +
> +void rpc_pipefs_exit_net(struct net *net)
> +{
> + struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
> +
> + kern_unmount(sn->pipefs_mnt);
> }
>
> /*
> diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
> index 3d6498a..5d7e961 100644
> --- a/net/sunrpc/sunrpc_syms.c
> +++ b/net/sunrpc/sunrpc_syms.c
> @@ -44,12 +44,17 @@ static __net_init int sunrpc_init_net(struct net *net)
> if (err)
> goto err_unixgid;
>
> - rpc_pipefs_init_net(net);
> + err = rpc_pipefs_init_net(net);
> + if (err)
> + goto err_gidcache;
> +
> INIT_LIST_HEAD(&sn->all_clients);
> spin_lock_init(&sn->rpc_client_lock);
> spin_lock_init(&sn->rpcb_clnt_lock);
> return 0;
>
> +err_gidcache:
> + unix_gid_cache_destroy(net);
> err_unixgid:
> ip_map_cache_destroy(net);
> err_ipmap:
> @@ -60,6 +65,7 @@ err_proc:
>
> static __net_exit void sunrpc_exit_net(struct net *net)
> {
> + rpc_pipefs_exit_net(net);
> unix_gid_cache_destroy(net);
> ip_map_cache_destroy(net);
> rpc_proc_exit(net);
Much cleaner.
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
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