[PATCH v2 10/12] sunrpc: introduce get_rpc_pipefs()

Kirill A. Shutemov
2010-12-29T13:15:31Z

Get rpc_pipefs mount point by path.

Signed-off-by: Kirill A. Shutemov <kas@openvz.org>
---
include/linux/sunrpc/rpc_pipe_fs.h | 2 +
net/sunrpc/rpc_pipe.c | 38 ++++++++++++++++++++++++++++++++++++
2 files changed, 40 insertions(+), 0 deletions(-)

diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
index b09bfa5..922057c 100644
--- a/include/linux/sunrpc/rpc_pipe_fs.h
+++ b/include/linux/sunrpc/rpc_pipe_fs.h
@@ -46,6 +46,8 @@ RPC_I(struct inode *inode)

extern struct vfsmount *init_rpc_pipefs;

+struct vfsmount *get_rpc_pipefs(const char *path);
+
extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *);

struct rpc_clnt;
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index b1e299b..fec6b2d 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -16,6 +16,7 @@
#include <linux/namei.h>
#include <linux/fsnotify.h>
#include <linux/kernel.h>
+#include <linux/nsproxy.h>

#include <asm/ioctls.h>
#include <linux/fs.h>
@@ -931,6 +932,43 @@ static const struct super_operations s_ops = {

#define RPCAUTH_GSSMAGIC 0x67596969

+struct vfsmount *get_rpc_pipefs(const char *p)
+{
+ int error;
+ struct vfsmount *rpcmount;
+ struct path path;
+
+ if (!p) {
+ /* Try to get with default rpcmount mount point */
+ rpcmount = get_rpc_pipefs("/var/lib/nfs/rpc_pipefs");
+
+ /*
+ * If nothing was found at default mount point and init's
+ * mount namespace is in use, use init_rpc_pipefs
+ */
+ if (IS_ERR(rpcmount) && (current->nsproxy->mnt_ns ==
+ init_task.nsproxy->mnt_ns))
+ return mntget(init_rpc_pipefs);
+
+ return rpcmount;
+ }
+
+ error = kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
+ if (error)
+ return ERR_PTR(error);
+
+ if (path.mnt->mnt_sb->s_magic != RPCAUTH_GSSMAGIC) {
+ path_put(&path);
+ return ERR_PTR(-EINVAL);
+ }
+
+ rpcmount = mntget(path.mnt);
+ path_put(&path);
+
+ return rpcmount;
+}
+EXPORT_SYMBOL_GPL(get_rpc_pipefs);
+
/*
* We have a single directory with 1 node in it.
*/
--
1.7.3.4