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-rw-r--r--fs/nfs/direct.c1
-rw-r--r--include/linux/sunrpc/sched.h21
-rw-r--r--net/sunrpc/sched.c78
3 files changed, 78 insertions, 22 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index a834423..ae2be07 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -268,7 +268,6 @@ static void nfs_direct_read_schedule(struct nfs_direct_req *dreq,
NFS_PROTO(inode)->read_setup(data);
data->task.tk_cookie = (unsigned long) inode;
- data->task.tk_calldata = data;
data->complete = nfs_direct_read_result;
lock_kernel();
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index ac1326f..94b0afa 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -42,6 +42,7 @@ struct rpc_task {
#ifdef RPC_DEBUG
unsigned long tk_magic; /* 0xf00baa */
#endif
+ atomic_t tk_count; /* Reference count */
struct list_head tk_task; /* global list of tasks */
struct rpc_clnt * tk_client; /* RPC client */
struct rpc_rqst * tk_rqstp; /* RPC request */
@@ -78,7 +79,6 @@ struct rpc_task {
struct timer_list tk_timer; /* kernel timer */
unsigned long tk_timeout; /* timeout for rpc_sleep() */
unsigned short tk_flags; /* misc flags */
- unsigned char tk_active : 1;/* Task has been activated */
unsigned char tk_priority : 2;/* Task priority */
unsigned long tk_runstate; /* Task run status */
struct workqueue_struct *tk_workqueue; /* Normally rpciod, but could
@@ -136,7 +136,6 @@ struct rpc_call_ops {
#define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
#define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS)
#define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED)
-#define RPC_IS_ACTIVATED(t) ((t)->tk_active)
#define RPC_DO_CALLBACK(t) ((t)->tk_callback != NULL)
#define RPC_IS_SOFT(t) ((t)->tk_flags & RPC_TASK_SOFT)
#define RPC_TASK_UNINTERRUPTIBLE(t) ((t)->tk_flags & RPC_TASK_NOINTR)
@@ -145,6 +144,7 @@ struct rpc_call_ops {
#define RPC_TASK_QUEUED 1
#define RPC_TASK_WAKEUP 2
#define RPC_TASK_HAS_TIMER 3
+#define RPC_TASK_ACTIVE 4
#define RPC_IS_RUNNING(t) (test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate))
#define rpc_set_running(t) (set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate))
@@ -175,6 +175,15 @@ struct rpc_call_ops {
smp_mb__after_clear_bit(); \
} while (0)
+#define RPC_IS_ACTIVATED(t) (test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate))
+#define rpc_set_active(t) (set_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate))
+#define rpc_clear_active(t) \
+ do { \
+ smp_mb__before_clear_bit(); \
+ clear_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate); \
+ smp_mb__after_clear_bit(); \
+ } while(0)
+
/*
* Task priorities.
* Note: if you change these, you must also change
@@ -237,6 +246,8 @@ struct rpc_wait_queue {
*/
struct rpc_task *rpc_new_task(struct rpc_clnt *, int flags,
const struct rpc_call_ops *ops, void *data);
+struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags,
+ const struct rpc_call_ops *ops, void *data);
struct rpc_task *rpc_new_child(struct rpc_clnt *, struct rpc_task *parent);
void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt,
int flags, const struct rpc_call_ops *ops,
@@ -260,6 +271,7 @@ void * rpc_malloc(struct rpc_task *, size_t);
int rpciod_up(void);
void rpciod_down(void);
void rpciod_wake_up(void);
+int __rpc_wait_for_completion_task(struct rpc_task *task, int (*)(void *));
#ifdef RPC_DEBUG
void rpc_show_tasks(void);
#endif
@@ -272,6 +284,11 @@ static inline void rpc_exit(struct rpc_task *task, int status)
task->tk_action = rpc_exit_task;
}
+static inline int rpc_wait_for_completion_task(struct rpc_task *task)
+{
+ return __rpc_wait_for_completion_task(task, NULL);
+}
+
#ifdef RPC_DEBUG
static inline const char * rpc_qname(struct rpc_wait_queue *q)
{
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 2d74a16..82d158d 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -264,6 +264,35 @@ 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 +328,7 @@ 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 +350,7 @@ 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);
@@ -580,14 +605,6 @@ void rpc_exit_task(struct rpc_task *task)
}
EXPORT_SYMBOL(rpc_exit_task);
-static int rpc_wait_bit_interruptible(void *word)
-{
- if (signal_pending(current))
- return -ERESTARTSYS;
- schedule();
- return 0;
-}
-
/*
* This is the RPC `scheduler' (or rather, the finite state machine).
*/
@@ -680,6 +697,8 @@ static int __rpc_execute(struct rpc_task *task)
dprintk("RPC: %4d exit() = %d\n", task->tk_pid, task->tk_status);
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;
@@ -697,9 +716,7 @@ 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);
}
@@ -761,6 +778,7 @@ void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, int flags, cons
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_ops = tk_ops;
@@ -848,11 +866,13 @@ void rpc_release_task(struct rpc_task *task)
{
const struct rpc_call_ops *tk_ops = task->tk_ops;
void *calldata = task->tk_calldata;
- dprintk("RPC: %4d release task\n", task->tk_pid);
#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);
@@ -860,7 +880,6 @@ 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);
@@ -886,6 +905,27 @@ void rpc_release_task(struct rpc_task *task)
}
/**
+ * 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
*
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