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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: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2013-08-27 16:27:04 -04:00
parent c36dcfe1f7
commit 298fc3558b
2 changed files with 41 additions and 0 deletions
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6
include/linux/sunrpc/rpc_pipe_fs.h
View File

@ -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 *,

35
net/sunrpc/rpc_pipe.c
View File

@ -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)
{