Commit 298fc355 authored by Trond Myklebust's avatar Trond Myklebust
Browse files

SUNRPC: Add a helper to allow sharing of rpc_pipefs directory objects 



Add support for looking up existing objects and creating new ones if there
is no match.

Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent c36dcfe1

include/linux/sunrpc/rpc_pipe_fs.h

+6 −0
Original line number Diff line number Diff line
@@ -106,6 +106,12 @@ extern int rpc_add_pipe_dir_object(struct net *net, 
extern void rpc_remove_pipe_dir_object(struct net *net,

		struct rpc_pipe_dir_head *pdh,

		struct rpc_pipe_dir_object *pdo);

extern struct rpc_pipe_dir_object *rpc_find_or_alloc_pipe_dir_object(

		struct net *net,

		struct rpc_pipe_dir_head *pdh,

		int (*match)(struct rpc_pipe_dir_object *, void *),

		struct rpc_pipe_dir_object *(*alloc)(void *),

		void *data);



struct cache_detail;

extern struct dentry *rpc_create_cache_dir(struct dentry *,

net/sunrpc/rpc_pipe.c

+35 −0
Original line number Diff line number Diff line
@@ -982,6 +982,41 @@ rpc_remove_pipe_dir_object(struct net *net, 
}

EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object);



/**

 * rpc_find_or_alloc_pipe_dir_object

 * @net: pointer to struct net

 * @pdh: pointer to struct rpc_pipe_dir_head

 * @match: match struct rpc_pipe_dir_object to data

 * @alloc: allocate a new struct rpc_pipe_dir_object

 * @data: user defined data for match() and alloc()

 *

 */

struct rpc_pipe_dir_object *

rpc_find_or_alloc_pipe_dir_object(struct net *net,

		struct rpc_pipe_dir_head *pdh,

		int (*match)(struct rpc_pipe_dir_object *, void *),

		struct rpc_pipe_dir_object *(*alloc)(void *),

		void *data)

{

	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);

	struct rpc_pipe_dir_object *pdo;



	mutex_lock(&sn->pipefs_sb_lock);

	list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) {

		if (!match(pdo, data))

			continue;

		goto out;

	}

	pdo = alloc(data);

	if (!pdo)

		goto out;

	rpc_add_pipe_dir_object_locked(net, pdh, pdo);

out:

	mutex_unlock(&sn->pipefs_sb_lock);

	return pdo;

}

EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object);



static void

rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)

{