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SUNRPC: Remove now-redundant RCU-safe rpc_task free path 

Now that we've tightened up the locking rules for RPC queue wakeups, we can
remove the RCU-safe kfree calls...

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
hifive-unleashed-5.1
Trond Myklebust 2008-02-25 21:53:49 -08:00
parent ff2d7db848
commit 5e4424af9a
4 changed files with 15 additions and 48 deletions
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8
fs/nfs/read.c
View File

@ -58,19 +58,13 @@ struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
return p;
}
static void nfs_readdata_rcu_free(struct rcu_head *head)
static void nfs_readdata_free(struct nfs_read_data *p)
{
struct nfs_read_data *p = container_of(head, struct nfs_read_data, task.u.tk_rcu);
if (p && (p->pagevec != &p->page_array[0]))
kfree(p->pagevec);
mempool_free(p, nfs_rdata_mempool);
}
static void nfs_readdata_free(struct nfs_read_data *rdata)
{
call_rcu_bh(&rdata->task.u.tk_rcu, nfs_readdata_rcu_free);
}
void nfs_readdata_release(void *data)
{
struct nfs_read_data *rdata = data;

16
fs/nfs/write.c
View File

@ -58,19 +58,13 @@ struct nfs_write_data *nfs_commit_alloc(void)
return p;
}
static void nfs_commit_rcu_free(struct rcu_head *head)
void nfs_commit_free(struct nfs_write_data *p)
{
struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu);
if (p && (p->pagevec != &p->page_array[0]))
kfree(p->pagevec);
mempool_free(p, nfs_commit_mempool);
}
void nfs_commit_free(struct nfs_write_data *wdata)
{
call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free);
}
struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
{
struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
@ -92,19 +86,13 @@ struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
return p;
}
static void nfs_writedata_rcu_free(struct rcu_head *head)
static void nfs_writedata_free(struct nfs_write_data *p)
{
struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu);
if (p && (p->pagevec != &p->page_array[0]))
kfree(p->pagevec);
mempool_free(p, nfs_wdata_mempool);
}
static void nfs_writedata_free(struct nfs_write_data *wdata)
{
call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free);
}
void nfs_writedata_release(void *data)
{
struct nfs_write_data *wdata = data;

2
include/linux/sunrpc/sched.h
View File

@ -11,7 +11,6 @@
#include <linux/timer.h>
#include <linux/sunrpc/types.h>
#include <linux/rcupdate.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
@ -77,7 +76,6 @@ struct rpc_task {
union {
struct work_struct tk_work; /* Async task work queue */
struct rpc_wait tk_wait; /* RPC wait */
struct rcu_head tk_rcu; /* for task deletion */
} u;
unsigned short tk_timeouts; /* maj timeouts */

37
net/sunrpc/sched.c
View File

@ -393,11 +393,9 @@ static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct r
*/
void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task)
{
rcu_read_lock_bh();
spin_lock(&queue->lock);
spin_lock_bh(&queue->lock);
rpc_wake_up_task_queue_locked(queue, task);
spin_unlock(&queue->lock);
rcu_read_unlock_bh();
spin_unlock_bh(&queue->lock);
}
EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task);
@ -470,16 +468,14 @@ struct rpc_task * rpc_wake_up_next(struct rpc_wait_queue *queue)
dprintk("RPC: wake_up_next(%p \"%s\")\n",
queue, rpc_qname(queue));
rcu_read_lock_bh();
spin_lock(&queue->lock);
spin_lock_bh(&queue->lock);
if (RPC_IS_PRIORITY(queue))
task = __rpc_wake_up_next_priority(queue);
else {
task_for_first(task, &queue->tasks[0])
rpc_wake_up_task_queue_locked(queue, task);
}
spin_unlock(&queue->lock);
rcu_read_unlock_bh();
spin_unlock_bh(&queue->lock);
return task;
}
@ -496,8 +492,7 @@ void rpc_wake_up(struct rpc_wait_queue *queue)
struct rpc_task *task, *next;
struct list_head *head;
rcu_read_lock_bh();
spin_lock(&queue->lock);
spin_lock_bh(&queue->lock);
head = &queue->tasks[queue->maxpriority];
for (;;) {
list_for_each_entry_safe(task, next, head, u.tk_wait.list)
@ -506,8 +501,7 @@ void rpc_wake_up(struct rpc_wait_queue *queue)
break;
head--;
}
spin_unlock(&queue->lock);
rcu_read_unlock_bh();
spin_unlock_bh(&queue->lock);
}
EXPORT_SYMBOL_GPL(rpc_wake_up);
@ -523,8 +517,7 @@ void rpc_wake_up_status(struct rpc_wait_queue *queue, int status)
struct rpc_task *task, *next;
struct list_head *head;
rcu_read_lock_bh();
spin_lock(&queue->lock);
spin_lock_bh(&queue->lock);
head = &queue->tasks[queue->maxpriority];
for (;;) {
list_for_each_entry_safe(task, next, head, u.tk_wait.list) {
@ -535,8 +528,7 @@ void rpc_wake_up_status(struct rpc_wait_queue *queue, int status)
break;
head--;
}
spin_unlock(&queue->lock);
rcu_read_unlock_bh();
spin_unlock_bh(&queue->lock);
}
EXPORT_SYMBOL_GPL(rpc_wake_up_status);
@ -848,13 +840,6 @@ rpc_alloc_task(void)
return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOFS);
}
static void rpc_free_task_rcu(struct rcu_head *rcu)
{
struct rpc_task *task = container_of(rcu, struct rpc_task, u.tk_rcu);
dprintk("RPC: %5u freeing task\n", task->tk_pid);
mempool_free(task, rpc_task_mempool);
}
/*
* Create a new task for the specified client.
*/
@ -883,8 +868,10 @@ static void rpc_free_task(struct rpc_task *task)
const struct rpc_call_ops *tk_ops = task->tk_ops;
void *calldata = task->tk_calldata;
if (task->tk_flags & RPC_TASK_DYNAMIC)
call_rcu_bh(&task->u.tk_rcu, rpc_free_task_rcu);
if (task->tk_flags & RPC_TASK_DYNAMIC) {
dprintk("RPC: %5u freeing task\n", task->tk_pid);
mempool_free(task, rpc_task_mempool);
}
rpc_release_calldata(tk_ops, calldata);
}