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Diffstat (limited to 'net/sunrpc/sched.c')
-rw-r--r--net/sunrpc/sched.c222
1 files changed, 135 insertions, 87 deletions
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 54e60a657500..7415406aa1ae 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -41,8 +41,6 @@ static mempool_t *rpc_buffer_mempool __read_mostly;
static void __rpc_default_timer(struct rpc_task *task);
static void rpciod_killall(void);
-static void rpc_free(struct rpc_task *task);
-
static void rpc_async_schedule(void *);
/*
@@ -264,6 +262,35 @@ void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname)
}
EXPORT_SYMBOL(rpc_init_wait_queue);
+static int rpc_wait_bit_interruptible(void *word)
+{
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+ schedule();
+ return 0;
+}
+
+/*
+ * Mark an RPC call as having completed by clearing the 'active' bit
+ */
+static inline void rpc_mark_complete_task(struct rpc_task *task)
+{
+ rpc_clear_active(task);
+ wake_up_bit(&task->tk_runstate, RPC_TASK_ACTIVE);
+}
+
+/*
+ * Allow callers to wait for completion of an RPC call
+ */
+int __rpc_wait_for_completion_task(struct rpc_task *task, int (*action)(void *))
+{
+ if (action == NULL)
+ action = rpc_wait_bit_interruptible;
+ return wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE,
+ action, TASK_INTERRUPTIBLE);
+}
+EXPORT_SYMBOL(__rpc_wait_for_completion_task);
+
/*
* Make an RPC task runnable.
*
@@ -299,10 +326,7 @@ static void rpc_make_runnable(struct rpc_task *task)
static inline void
rpc_schedule_run(struct rpc_task *task)
{
- /* Don't run a child twice! */
- if (RPC_IS_ACTIVATED(task))
- return;
- task->tk_active = 1;
+ rpc_set_active(task);
rpc_make_runnable(task);
}
@@ -324,8 +348,7 @@ static void __rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
}
/* Mark the task as being activated if so needed */
- if (!RPC_IS_ACTIVATED(task))
- task->tk_active = 1;
+ rpc_set_active(task);
__rpc_add_wait_queue(q, task);
@@ -555,36 +578,29 @@ __rpc_atrun(struct rpc_task *task)
}
/*
- * Helper that calls task->tk_exit if it exists and then returns
- * true if we should exit __rpc_execute.
+ * Helper to call task->tk_ops->rpc_call_prepare
*/
-static inline int __rpc_do_exit(struct rpc_task *task)
+static void rpc_prepare_task(struct rpc_task *task)
{
- if (task->tk_exit != NULL) {
- lock_kernel();
- task->tk_exit(task);
- unlock_kernel();
- /* If tk_action is non-null, we should restart the call */
- if (task->tk_action != NULL) {
- if (!RPC_ASSASSINATED(task)) {
- /* Release RPC slot and buffer memory */
- xprt_release(task);
- rpc_free(task);
- return 0;
- }
- printk(KERN_ERR "RPC: dead task tried to walk away.\n");
- }
- }
- return 1;
+ task->tk_ops->rpc_call_prepare(task, task->tk_calldata);
}
-static int rpc_wait_bit_interruptible(void *word)
+/*
+ * Helper that calls task->tk_ops->rpc_call_done if it exists
+ */
+void rpc_exit_task(struct rpc_task *task)
{
- if (signal_pending(current))
- return -ERESTARTSYS;
- schedule();
- return 0;
+ task->tk_action = NULL;
+ if (task->tk_ops->rpc_call_done != NULL) {
+ task->tk_ops->rpc_call_done(task, task->tk_calldata);
+ if (task->tk_action != NULL) {
+ WARN_ON(RPC_ASSASSINATED(task));
+ /* Always release the RPC slot and buffer memory */
+ xprt_release(task);
+ }
+ }
}
+EXPORT_SYMBOL(rpc_exit_task);
/*
* This is the RPC `scheduler' (or rather, the finite state machine).
@@ -631,12 +647,11 @@ static int __rpc_execute(struct rpc_task *task)
* by someone else.
*/
if (!RPC_IS_QUEUED(task)) {
- if (task->tk_action != NULL) {
- lock_kernel();
- task->tk_action(task);
- unlock_kernel();
- } else if (__rpc_do_exit(task))
+ if (task->tk_action == NULL)
break;
+ lock_kernel();
+ task->tk_action(task);
+ unlock_kernel();
}
/*
@@ -676,9 +691,9 @@ static int __rpc_execute(struct rpc_task *task)
dprintk("RPC: %4d sync task resuming\n", task->tk_pid);
}
- dprintk("RPC: %4d exit() = %d\n", task->tk_pid, task->tk_status);
- status = task->tk_status;
-
+ dprintk("RPC: %4d, return %d, status %d\n", task->tk_pid, status, task->tk_status);
+ /* Wake up anyone who is waiting for task completion */
+ rpc_mark_complete_task(task);
/* Release all resources associated with the task */
rpc_release_task(task);
return status;
@@ -696,9 +711,7 @@ static int __rpc_execute(struct rpc_task *task)
int
rpc_execute(struct rpc_task *task)
{
- BUG_ON(task->tk_active);
-
- task->tk_active = 1;
+ rpc_set_active(task);
rpc_set_running(task);
return __rpc_execute(task);
}
@@ -708,17 +721,19 @@ static void rpc_async_schedule(void *arg)
__rpc_execute((struct rpc_task *)arg);
}
-/*
- * Allocate memory for RPC purposes.
+/**
+ * rpc_malloc - allocate an RPC buffer
+ * @task: RPC task that will use this buffer
+ * @size: requested byte size
*
* We try to ensure that some NFS reads and writes can always proceed
* by using a mempool when allocating 'small' buffers.
* In order to avoid memory starvation triggering more writebacks of
* NFS requests, we use GFP_NOFS rather than GFP_KERNEL.
*/
-void *
-rpc_malloc(struct rpc_task *task, size_t size)
+void * rpc_malloc(struct rpc_task *task, size_t size)
{
+ struct rpc_rqst *req = task->tk_rqstp;
gfp_t gfp;
if (task->tk_flags & RPC_TASK_SWAPPER)
@@ -727,42 +742,52 @@ rpc_malloc(struct rpc_task *task, size_t size)
gfp = GFP_NOFS;
if (size > RPC_BUFFER_MAXSIZE) {
- task->tk_buffer = kmalloc(size, gfp);
- if (task->tk_buffer)
- task->tk_bufsize = size;
+ req->rq_buffer = kmalloc(size, gfp);
+ if (req->rq_buffer)
+ req->rq_bufsize = size;
} else {
- task->tk_buffer = mempool_alloc(rpc_buffer_mempool, gfp);
- if (task->tk_buffer)
- task->tk_bufsize = RPC_BUFFER_MAXSIZE;
+ req->rq_buffer = mempool_alloc(rpc_buffer_mempool, gfp);
+ if (req->rq_buffer)
+ req->rq_bufsize = RPC_BUFFER_MAXSIZE;
}
- return task->tk_buffer;
+ return req->rq_buffer;
}
-static void
-rpc_free(struct rpc_task *task)
+/**
+ * rpc_free - free buffer allocated via rpc_malloc
+ * @task: RPC task with a buffer to be freed
+ *
+ */
+void rpc_free(struct rpc_task *task)
{
- if (task->tk_buffer) {
- if (task->tk_bufsize == RPC_BUFFER_MAXSIZE)
- mempool_free(task->tk_buffer, rpc_buffer_mempool);
+ struct rpc_rqst *req = task->tk_rqstp;
+
+ if (req->rq_buffer) {
+ if (req->rq_bufsize == RPC_BUFFER_MAXSIZE)
+ mempool_free(req->rq_buffer, rpc_buffer_mempool);
else
- kfree(task->tk_buffer);
- task->tk_buffer = NULL;
- task->tk_bufsize = 0;
+ kfree(req->rq_buffer);
+ req->rq_buffer = NULL;
+ req->rq_bufsize = 0;
}
}
/*
* Creation and deletion of RPC task structures
*/
-void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, rpc_action callback, int flags)
+void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, int flags, const struct rpc_call_ops *tk_ops, void *calldata)
{
memset(task, 0, sizeof(*task));
init_timer(&task->tk_timer);
task->tk_timer.data = (unsigned long) task;
task->tk_timer.function = (void (*)(unsigned long)) rpc_run_timer;
+ atomic_set(&task->tk_count, 1);
task->tk_client = clnt;
task->tk_flags = flags;
- task->tk_exit = callback;
+ task->tk_ops = tk_ops;
+ if (tk_ops->rpc_call_prepare != NULL)
+ task->tk_action = rpc_prepare_task;
+ task->tk_calldata = calldata;
/* Initialize retry counters */
task->tk_garb_retry = 2;
@@ -791,6 +816,8 @@ void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, rpc_action call
list_add_tail(&task->tk_task, &all_tasks);
spin_unlock(&rpc_sched_lock);
+ BUG_ON(task->tk_ops == NULL);
+
dprintk("RPC: %4d new task procpid %d\n", task->tk_pid,
current->pid);
}
@@ -801,8 +828,7 @@ rpc_alloc_task(void)
return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOFS);
}
-static void
-rpc_default_free_task(struct rpc_task *task)
+static void rpc_free_task(struct rpc_task *task)
{
dprintk("RPC: %4d freeing task\n", task->tk_pid);
mempool_free(task, rpc_task_mempool);
@@ -813,8 +839,7 @@ rpc_default_free_task(struct rpc_task *task)
* clean up after an allocation failure, as the client may
* have specified "oneshot".
*/
-struct rpc_task *
-rpc_new_task(struct rpc_clnt *clnt, rpc_action callback, int flags)
+struct rpc_task *rpc_new_task(struct rpc_clnt *clnt, int flags, const struct rpc_call_ops *tk_ops, void *calldata)
{
struct rpc_task *task;
@@ -822,10 +847,7 @@ rpc_new_task(struct rpc_clnt *clnt, rpc_action callback, int flags)
if (!task)
goto cleanup;
- rpc_init_task(task, clnt, callback, flags);
-
- /* Replace tk_release */
- task->tk_release = rpc_default_free_task;
+ rpc_init_task(task, clnt, flags, tk_ops, calldata);
dprintk("RPC: %4d allocated task\n", task->tk_pid);
task->tk_flags |= RPC_TASK_DYNAMIC;
@@ -845,11 +867,15 @@ cleanup:
void rpc_release_task(struct rpc_task *task)
{
- dprintk("RPC: %4d release task\n", task->tk_pid);
+ const struct rpc_call_ops *tk_ops = task->tk_ops;
+ void *calldata = task->tk_calldata;
#ifdef RPC_DEBUG
BUG_ON(task->tk_magic != RPC_TASK_MAGIC_ID);
#endif
+ if (!atomic_dec_and_test(&task->tk_count))
+ return;
+ dprintk("RPC: %4d release task\n", task->tk_pid);
/* Remove from global task list */
spin_lock(&rpc_sched_lock);
@@ -857,7 +883,6 @@ void rpc_release_task(struct rpc_task *task)
spin_unlock(&rpc_sched_lock);
BUG_ON (RPC_IS_QUEUED(task));
- task->tk_active = 0;
/* Synchronously delete any running timer */
rpc_delete_timer(task);
@@ -867,7 +892,6 @@ void rpc_release_task(struct rpc_task *task)
xprt_release(task);
if (task->tk_msg.rpc_cred)
rpcauth_unbindcred(task);
- rpc_free(task);
if (task->tk_client) {
rpc_release_client(task->tk_client);
task->tk_client = NULL;
@@ -876,11 +900,34 @@ void rpc_release_task(struct rpc_task *task)
#ifdef RPC_DEBUG
task->tk_magic = 0;
#endif
- if (task->tk_release)
- task->tk_release(task);
+ if (task->tk_flags & RPC_TASK_DYNAMIC)
+ rpc_free_task(task);
+ if (tk_ops->rpc_release)
+ tk_ops->rpc_release(calldata);
}
/**
+ * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it
+ * @clnt - pointer to RPC client
+ * @flags - RPC flags
+ * @ops - RPC call ops
+ * @data - user call data
+ */
+struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags,
+ const struct rpc_call_ops *ops,
+ void *data)
+{
+ struct rpc_task *task;
+ task = rpc_new_task(clnt, flags, ops, data);
+ if (task == NULL)
+ return ERR_PTR(-ENOMEM);
+ atomic_inc(&task->tk_count);
+ rpc_execute(task);
+ return task;
+}
+EXPORT_SYMBOL(rpc_run_task);
+
+/**
* rpc_find_parent - find the parent of a child task.
* @child: child task
*
@@ -890,12 +937,11 @@ void rpc_release_task(struct rpc_task *task)
*
* Caller must hold childq.lock
*/
-static inline struct rpc_task *rpc_find_parent(struct rpc_task *child)
+static inline struct rpc_task *rpc_find_parent(struct rpc_task *child, struct rpc_task *parent)
{
- struct rpc_task *task, *parent;
+ struct rpc_task *task;
struct list_head *le;
- parent = (struct rpc_task *) child->tk_calldata;
task_for_each(task, le, &childq.tasks[0])
if (task == parent)
return parent;
@@ -903,18 +949,22 @@ static inline struct rpc_task *rpc_find_parent(struct rpc_task *child)
return NULL;
}
-static void rpc_child_exit(struct rpc_task *child)
+static void rpc_child_exit(struct rpc_task *child, void *calldata)
{
struct rpc_task *parent;
spin_lock_bh(&childq.lock);
- if ((parent = rpc_find_parent(child)) != NULL) {
+ if ((parent = rpc_find_parent(child, calldata)) != NULL) {
parent->tk_status = child->tk_status;
__rpc_wake_up_task(parent);
}
spin_unlock_bh(&childq.lock);
}
+static const struct rpc_call_ops rpc_child_ops = {
+ .rpc_call_done = rpc_child_exit,
+};
+
/*
* Note: rpc_new_task releases the client after a failure.
*/
@@ -923,11 +973,9 @@ rpc_new_child(struct rpc_clnt *clnt, struct rpc_task *parent)
{
struct rpc_task *task;
- task = rpc_new_task(clnt, NULL, RPC_TASK_ASYNC | RPC_TASK_CHILD);
+ task = rpc_new_task(clnt, RPC_TASK_ASYNC | RPC_TASK_CHILD, &rpc_child_ops, parent);
if (!task)
goto fail;
- task->tk_exit = rpc_child_exit;
- task->tk_calldata = parent;
return task;
fail:
@@ -1063,7 +1111,7 @@ void rpc_show_tasks(void)
return;
}
printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout "
- "-rpcwait -action- --exit--\n");
+ "-rpcwait -action- ---ops--\n");
alltask_for_each(t, le, &all_tasks) {
const char *rpc_waitq = "none";
@@ -1078,7 +1126,7 @@ void rpc_show_tasks(void)
(t->tk_client ? t->tk_client->cl_prog : 0),
t->tk_rqstp, t->tk_timeout,
rpc_waitq,
- t->tk_action, t->tk_exit);
+ t->tk_action, t->tk_ops);
}
spin_unlock(&rpc_sched_lock);
}