SUNRPC: Convert rpc_clnt->cl_users to a kref

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-06-14 16:40:31 -04:00
parent c44fe70553
commit 34f52e3591
5 changed files with 35 additions and 44 deletions

View File

@ -161,15 +161,9 @@ nlm_destroy_host(struct nlm_host *host)
*/
nsm_unmonitor(host);
if ((clnt = host->h_rpcclnt) != NULL) {
if (atomic_read(&clnt->cl_users)) {
printk(KERN_WARNING
"lockd: active RPC handle\n");
clnt->cl_dead = 1;
} else {
rpc_destroy_client(host->h_rpcclnt);
}
}
clnt = host->h_rpcclnt;
if (clnt != NULL)
rpc_shutdown_client(clnt);
kfree(host);
}

View File

@ -24,8 +24,8 @@ struct rpc_inode;
* The high-level client handle
*/
struct rpc_clnt {
struct kref cl_kref; /* Number of references */
atomic_t cl_count; /* Number of clones */
atomic_t cl_users; /* number of references */
struct list_head cl_clients; /* Global list of clients */
struct list_head cl_tasks; /* List of tasks */
spinlock_t cl_lock; /* spinlock */

View File

@ -121,7 +121,6 @@ static struct rpc_clnt * rpc_new_client(struct rpc_xprt *xprt, char *servname, s
clnt = kzalloc(sizeof(*clnt), GFP_KERNEL);
if (!clnt)
goto out_err;
atomic_set(&clnt->cl_users, 0);
atomic_set(&clnt->cl_count, 1);
clnt->cl_parent = clnt;
@ -157,6 +156,8 @@ static struct rpc_clnt * rpc_new_client(struct rpc_xprt *xprt, char *servname, s
clnt->cl_rtt = &clnt->cl_rtt_default;
rpc_init_rtt(&clnt->cl_rtt_default, xprt->timeout.to_initval);
kref_init(&clnt->cl_kref);
err = rpc_setup_pipedir(clnt, program->pipe_dir_name);
if (err < 0)
goto out_no_path;
@ -272,10 +273,10 @@ rpc_clone_client(struct rpc_clnt *clnt)
if (!new)
goto out_no_clnt;
atomic_set(&new->cl_count, 1);
atomic_set(&new->cl_users, 0);
new->cl_metrics = rpc_alloc_iostats(clnt);
if (new->cl_metrics == NULL)
goto out_no_stats;
kref_init(&new->cl_kref);
err = rpc_setup_pipedir(new, clnt->cl_program->pipe_dir_name);
if (err != 0)
goto out_no_path;
@ -311,40 +312,28 @@ out_no_clnt:
int
rpc_shutdown_client(struct rpc_clnt *clnt)
{
dprintk("RPC: shutting down %s client for %s, tasks=%d\n",
clnt->cl_protname, clnt->cl_server,
atomic_read(&clnt->cl_users));
dprintk("RPC: shutting down %s client for %s\n",
clnt->cl_protname, clnt->cl_server);
while (atomic_read(&clnt->cl_users) > 0) {
while (!list_empty(&clnt->cl_tasks)) {
/* Don't let rpc_release_client destroy us */
clnt->cl_oneshot = 0;
clnt->cl_dead = 0;
rpc_killall_tasks(clnt);
wait_event_timeout(destroy_wait,
!atomic_read(&clnt->cl_users), 1*HZ);
}
if (atomic_read(&clnt->cl_users) < 0) {
printk(KERN_ERR "RPC: rpc_shutdown_client clnt %p tasks=%d\n",
clnt, atomic_read(&clnt->cl_users));
#ifdef RPC_DEBUG
rpc_show_tasks();
#endif
BUG();
list_empty(&clnt->cl_tasks), 1*HZ);
}
return rpc_destroy_client(clnt);
}
/*
* Delete an RPC client
* Free an RPC client
*/
int
rpc_destroy_client(struct rpc_clnt *clnt)
static void
rpc_free_client(struct kref *kref)
{
if (!atomic_dec_and_test(&clnt->cl_count))
return 1;
BUG_ON(atomic_read(&clnt->cl_users) != 0);
struct rpc_clnt *clnt = container_of(kref, struct rpc_clnt, cl_kref);
dprintk("RPC: destroying %s client for %s\n",
clnt->cl_protname, clnt->cl_server);
@ -368,23 +357,33 @@ out_free:
clnt->cl_metrics = NULL;
xprt_put(clnt->cl_xprt);
kfree(clnt);
return 0;
}
/*
* Release an RPC client
* Release reference to the RPC client
*/
void
rpc_release_client(struct rpc_clnt *clnt)
{
dprintk("RPC: rpc_release_client(%p, %d)\n",
clnt, atomic_read(&clnt->cl_users));
dprintk("RPC: rpc_release_client(%p)\n", clnt);
if (!atomic_dec_and_test(&clnt->cl_users))
return;
wake_up(&destroy_wait);
if (list_empty(&clnt->cl_tasks))
wake_up(&destroy_wait);
if (clnt->cl_oneshot || clnt->cl_dead)
rpc_destroy_client(clnt);
kref_put(&clnt->cl_kref, rpc_free_client);
}
/*
* Delete an RPC client
*/
int
rpc_destroy_client(struct rpc_clnt *clnt)
{
if (!atomic_dec_and_test(&clnt->cl_count))
return 1;
kref_put(&clnt->cl_kref, rpc_free_client);
return 0;
}
/**

View File

@ -344,7 +344,7 @@ rpc_info_open(struct inode *inode, struct file *file)
mutex_lock(&inode->i_mutex);
clnt = RPC_I(inode)->private;
if (clnt) {
atomic_inc(&clnt->cl_users);
kref_get(&clnt->cl_kref);
m->private = clnt;
} else {
single_release(inode, file);

View File

@ -846,7 +846,7 @@ void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, int flags, cons
task->tk_workqueue = rpciod_workqueue;
if (clnt) {
atomic_inc(&clnt->cl_users);
kref_get(&clnt->cl_kref);
if (clnt->cl_softrtry)
task->tk_flags |= RPC_TASK_SOFT;
if (!clnt->cl_intr)
@ -898,9 +898,7 @@ out:
cleanup:
/* Check whether to release the client */
if (clnt) {
printk("rpc_new_task: failed, users=%d, oneshot=%d\n",
atomic_read(&clnt->cl_users), clnt->cl_oneshot);
atomic_inc(&clnt->cl_users); /* pretend we were used ... */
kref_get(&clnt->cl_kref); /* pretend we were used ... */
rpc_release_client(clnt);
}
goto out;