rpc: track number of users of the gss upcall pipe
Keep a count of the number of pipes open plus the number of messages on
a pipe. This count isn't used yet.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index bc512ff..51aa27d 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -75,6 +75,8 @@
struct dentry *dentry;
};
+static atomic_t pipe_users = ATOMIC_INIT(0);
+
static void gss_free_ctx(struct gss_cl_ctx *);
static struct rpc_pipe_ops gss_upcall_ops;
@@ -237,6 +239,7 @@
{
if (!atomic_dec_and_test(&gss_msg->count))
return;
+ atomic_dec(&pipe_users);
BUG_ON(!list_empty(&gss_msg->list));
if (gss_msg->ctx != NULL)
gss_put_ctx(gss_msg->ctx);
@@ -331,6 +334,7 @@
gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS);
if (gss_msg == NULL)
return ERR_PTR(-ENOMEM);
+ atomic_inc(&pipe_users);
INIT_LIST_HEAD(&gss_msg->list);
rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
init_waitqueue_head(&gss_msg->waitqueue);
@@ -555,6 +559,13 @@
return err;
}
+static int
+gss_pipe_open(struct inode *inode)
+{
+ atomic_inc(&pipe_users);
+ return 0;
+}
+
static void
gss_pipe_release(struct inode *inode)
{
@@ -574,6 +585,8 @@
spin_lock(&inode->i_lock);
}
spin_unlock(&inode->i_lock);
+
+ atomic_dec(&pipe_users);
}
static void
@@ -1349,6 +1362,7 @@
.upcall = gss_pipe_upcall,
.downcall = gss_pipe_downcall,
.destroy_msg = gss_pipe_destroy_msg,
+ .open_pipe = gss_pipe_open,
.release_pipe = gss_pipe_release,
};