NLM: Add nlmclnt_release_call
Add a helper function to simplify the freeing of NLM client requests.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index 7a23986..3f8ad7c 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -152,9 +152,8 @@
int
nlmclnt_proc(struct inode *inode, int cmd, struct file_lock *fl)
{
- struct nfs_server *nfssrv = NFS_SERVER(inode);
struct nlm_host *host;
- struct nlm_rqst reqst, *call = &reqst;
+ struct nlm_rqst *call;
sigset_t oldset;
unsigned long flags;
int status, proto, vers;
@@ -168,23 +167,17 @@
/* Retrieve transport protocol from NFS client */
proto = NFS_CLIENT(inode)->cl_xprt->prot;
- if (!(host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers)))
+ host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers);
+ if (host == NULL)
return -ENOLCK;
- /* Create RPC client handle if not there, and copy soft
- * and intr flags from NFS client. */
- if (host->h_rpcclnt == NULL) {
- struct rpc_clnt *clnt;
+ call = nlm_alloc_call(host);
+ if (call == NULL)
+ return -ENOMEM;
- /* Bind an rpc client to this host handle (does not
- * perform a portmapper lookup) */
- if (!(clnt = nlm_bind_host(host))) {
- status = -ENOLCK;
- goto done;
- }
- clnt->cl_softrtry = nfssrv->client->cl_softrtry;
- clnt->cl_intr = nfssrv->client->cl_intr;
- }
+ nlmclnt_locks_init_private(fl, host);
+ /* Set up the argument struct */
+ nlmclnt_setlockargs(call, fl);
/* Keep the old signal mask */
spin_lock_irqsave(¤t->sighand->siglock, flags);
@@ -197,26 +190,10 @@
&& (current->flags & PF_EXITING)) {
sigfillset(¤t->blocked); /* Mask all signals */
recalc_sigpending();
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
- call = nlmclnt_alloc_call();
- if (!call) {
- status = -ENOMEM;
- goto out_restore;
- }
call->a_flags = RPC_TASK_ASYNC;
- } else {
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
- memset(call, 0, sizeof(*call));
- locks_init_lock(&call->a_args.lock.fl);
- locks_init_lock(&call->a_res.lock.fl);
}
- call->a_host = host;
-
- nlmclnt_locks_init_private(fl, host);
-
- /* Set up the argument struct */
- nlmclnt_setlockargs(call, fl);
+ spin_unlock_irqrestore(¤t->sighand->siglock, flags);
if (IS_SETLK(cmd) || IS_SETLKW(cmd)) {
if (fl->fl_type != F_UNLCK) {
@@ -229,24 +206,26 @@
else
status = -EINVAL;
- out_restore:
+ fl->fl_ops->fl_release_private(fl);
+ fl->fl_ops = NULL;
+
spin_lock_irqsave(¤t->sighand->siglock, flags);
current->blocked = oldset;
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
-done:
dprintk("lockd: clnt proc returns %d\n", status);
- nlm_release_host(host);
return status;
}
EXPORT_SYMBOL(nlmclnt_proc);
/*
* Allocate an NLM RPC call struct
+ *
+ * Note: the caller must hold a reference to host. In case of failure,
+ * this reference will be released.
*/
-struct nlm_rqst *
-nlmclnt_alloc_call(void)
+struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
{
struct nlm_rqst *call;
@@ -255,16 +234,30 @@
if (call != NULL) {
locks_init_lock(&call->a_args.lock.fl);
locks_init_lock(&call->a_res.lock.fl);
+ call->a_host = host;
return call;
}
if (signalled())
break;
- printk("nlmclnt_alloc_call: failed, waiting for memory\n");
+ printk("nlm_alloc_call: failed, waiting for memory\n");
schedule_timeout_interruptible(5*HZ);
}
+ nlm_release_host(host);
return NULL;
}
+void nlm_release_call(struct nlm_rqst *call)
+{
+ nlm_release_host(call->a_host);
+ nlmclnt_release_lockargs(call);
+ kfree(call);
+}
+
+static void nlmclnt_rpc_release(void *data)
+{
+ return nlm_release_call(data);
+}
+
static int nlm_wait_on_grace(wait_queue_head_t *queue)
{
DEFINE_WAIT(wait);
@@ -361,7 +354,7 @@
/*
* Generic NLM call, async version.
*/
-int nlmsvc_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+int nlm_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
{
struct nlm_host *host = req->a_host;
struct rpc_clnt *clnt;
@@ -369,48 +362,23 @@
.rpc_argp = &req->a_args,
.rpc_resp = &req->a_res,
};
- int status;
+ int status = -ENOLCK;
dprintk("lockd: call procedure %d on %s (async)\n",
(int)proc, host->h_name);
/* If we have no RPC client yet, create one. */
- if ((clnt = nlm_bind_host(host)) == NULL)
- return -ENOLCK;
+ clnt = nlm_bind_host(host);
+ if (clnt == NULL)
+ goto out_err;
msg.rpc_proc = &clnt->cl_procinfo[proc];
/* bootstrap and kick off the async RPC call */
status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, tk_ops, req);
-
- return status;
-}
-
-static int nlmclnt_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
-{
- struct nlm_host *host = req->a_host;
- struct rpc_clnt *clnt;
- struct nlm_args *argp = &req->a_args;
- struct nlm_res *resp = &req->a_res;
- struct rpc_message msg = {
- .rpc_argp = argp,
- .rpc_resp = resp,
- };
- int status;
-
- dprintk("lockd: call procedure %d on %s (async)\n",
- (int)proc, host->h_name);
-
- /* If we have no RPC client yet, create one. */
- if ((clnt = nlm_bind_host(host)) == NULL)
- return -ENOLCK;
- msg.rpc_proc = &clnt->cl_procinfo[proc];
-
- /* Increment host refcount */
- nlm_get_host(host);
- /* bootstrap and kick off the async RPC call */
- status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, tk_ops, req);
- if (status < 0)
- nlm_release_host(host);
+ if (status == 0)
+ return 0;
+out_err:
+ nlm_release_call(req);
return status;
}
@@ -423,26 +391,28 @@
int status;
status = nlmclnt_call(req, NLMPROC_TEST);
- nlmclnt_release_lockargs(req);
if (status < 0)
- return status;
+ goto out;
- status = req->a_res.status;
- if (status == NLM_LCK_GRANTED) {
- fl->fl_type = F_UNLCK;
- } if (status == NLM_LCK_DENIED) {
- /*
- * Report the conflicting lock back to the application.
- */
- fl->fl_start = req->a_res.lock.fl.fl_start;
- fl->fl_end = req->a_res.lock.fl.fl_start;
- fl->fl_type = req->a_res.lock.fl.fl_type;
- fl->fl_pid = 0;
- } else {
- return nlm_stat_to_errno(req->a_res.status);
+ switch (req->a_res.status) {
+ case NLM_LCK_GRANTED:
+ fl->fl_type = F_UNLCK;
+ break;
+ case NLM_LCK_DENIED:
+ /*
+ * Report the conflicting lock back to the application.
+ */
+ fl->fl_start = req->a_res.lock.fl.fl_start;
+ fl->fl_end = req->a_res.lock.fl.fl_start;
+ fl->fl_type = req->a_res.lock.fl.fl_type;
+ fl->fl_pid = 0;
+ break;
+ default:
+ status = nlm_stat_to_errno(req->a_res.status);
}
-
- return 0;
+out:
+ nlm_release_call(req);
+ return status;
}
static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl)
@@ -560,7 +530,7 @@
if (resp->status == NLM_LCK_BLOCKED)
nlmclnt_cancel(host, req->a_args.block, fl);
out:
- nlmclnt_release_lockargs(req);
+ nlm_release_call(req);
return status;
}
@@ -623,32 +593,24 @@
*/
do_vfs_lock(fl);
- if (req->a_flags & RPC_TASK_ASYNC) {
- status = nlmclnt_async_call(req, NLMPROC_UNLOCK,
- &nlmclnt_unlock_ops);
- /* Hrmf... Do the unlock early since locks_remove_posix()
- * really expects us to free the lock synchronously */
- if (status < 0) {
- nlmclnt_release_lockargs(req);
- kfree(req);
- }
- return status;
- }
+ if (req->a_flags & RPC_TASK_ASYNC)
+ return nlm_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
status = nlmclnt_call(req, NLMPROC_UNLOCK);
- nlmclnt_release_lockargs(req);
if (status < 0)
- return status;
+ goto out;
+ status = 0;
if (resp->status == NLM_LCK_GRANTED)
- return 0;
+ goto out;
if (resp->status != NLM_LCK_DENIED_NOLOCKS)
printk("lockd: unexpected unlock status: %d\n", resp->status);
-
/* What to do now? I'm out of my depth... */
-
- return -ENOLCK;
+ status = -ENOLCK;
+out:
+ nlm_release_call(req);
+ return status;
}
static void nlmclnt_unlock_callback(struct rpc_task *task, void *data)
@@ -670,9 +632,6 @@
if (status != NLM_LCK_GRANTED)
printk(KERN_WARNING "lockd: unexpected unlock status: %d\n", status);
die:
- nlm_release_host(req->a_host);
- nlmclnt_release_lockargs(req);
- kfree(req);
return;
retry_rebind:
nlm_rebind_host(req->a_host);
@@ -682,6 +641,7 @@
static const struct rpc_call_ops nlmclnt_unlock_ops = {
.rpc_call_done = nlmclnt_unlock_callback,
+ .rpc_release = nlmclnt_rpc_release,
};
/*
@@ -703,20 +663,15 @@
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
- req = nlmclnt_alloc_call();
+ req = nlm_alloc_call(nlm_get_host(host));
if (!req)
return -ENOMEM;
- req->a_host = host;
req->a_flags = RPC_TASK_ASYNC;
nlmclnt_setlockargs(req, fl);
req->a_args.block = block;
- status = nlmclnt_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops);
- if (status < 0) {
- nlmclnt_release_lockargs(req);
- kfree(req);
- }
+ status = nlm_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops);
spin_lock_irqsave(¤t->sighand->siglock, flags);
current->blocked = oldset;
@@ -757,9 +712,6 @@
}
die:
- nlm_release_host(req->a_host);
- nlmclnt_release_lockargs(req);
- kfree(req);
return;
retry_cancel:
@@ -773,6 +725,7 @@
static const struct rpc_call_ops nlmclnt_cancel_ops = {
.rpc_call_done = nlmclnt_cancel_callback,
+ .rpc_release = nlmclnt_rpc_release,
};
/*