[PATCH]aio: remove unused field

Shaohua Li
2009-11-12T07:52:51Z

Don't know the reason, but it appears ki_wait field of iocb never gets used.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>

diff --git a/fs/aio.c b/fs/aio.c
index 02a2c93..5ec1e70 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -697,10 +697,8 @@ static ssize_t aio_run_iocb(struct kiocb *iocb)
*/
ret = retry(iocb);

- if (ret != -EIOCBRETRY && ret != -EIOCBQUEUED) {
- BUG_ON(!list_empty(&iocb->ki_wait.task_list));
+ if (ret != -EIOCBRETRY && ret != -EIOCBQUEUED)
aio_complete(iocb, ret, 0);
- }
out:
spin_lock_irq(&ctx->ctx_lock);

@@ -852,13 +850,6 @@ static void try_queue_kicked_iocb(struct kiocb *iocb)
unsigned long flags;
int run = 0;

- /* We're supposed to be the only path putting the iocb back on the run
- * list. If we find that the iocb is *back* on a wait queue already
- * than retry has happened before we could queue the iocb. This also
- * means that the retry could have completed and freed our iocb, no
- * good. */
- BUG_ON((!list_empty(&iocb->ki_wait.task_list)));
-
spin_lock_irqsave(&ctx->ctx_lock, flags);
/* set this inside the lock so that we can't race with aio_run_iocb()
* testing it and putting the iocb on the run list under the lock */
@@ -1506,31 +1497,6 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb)
return 0;
}

-/*
- * aio_wake_function:
- * wait queue callback function for aio notification,
- * Simply triggers a retry of the operation via kick_iocb.
- *
- * This callback is specified in the wait queue entry in
- * a kiocb.
- *
- * Note:
- * This routine is executed with the wait queue lock held.
- * Since kick_iocb acquires iocb->ctx->ctx_lock, it nests
- * the ioctx lock inside the wait queue lock. This is safe
- * because this callback isn't used for wait queues which
- * are nested inside ioctx lock (i.e. ctx->wait)
- */
-static int aio_wake_function(wait_queue_t *wait, unsigned mode,
- int sync, void *key)
-{
- struct kiocb *iocb = container_of(wait, struct kiocb, ki_wait);
-
- list_del_init(&wait->task_list);
- kick_iocb(iocb);
- return 1;
-}
-
static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
struct iocb *iocb)
{
@@ -1592,8 +1558,6 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
req->ki_buf = (char __user *)(unsigned long)iocb->aio_buf;
req->ki_left = req->ki_nbytes = iocb->aio_nbytes;
req->ki_opcode = iocb->aio_lio_opcode;
- init_waitqueue_func_entry(&req->ki_wait, aio_wake_function);
- INIT_LIST_HEAD(&req->ki_wait.task_list);

ret = aio_setup_iocb(req);

diff --git a/include/linux/aio.h b/include/linux/aio.h
index aea219d..811dbb3 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -102,7 +102,6 @@ struct kiocb {
} ki_obj;

__u64 ki_user_data; /* user's data for completion */
- wait_queue_t ki_wait;
loff_t ki_pos;

void *private;
@@ -140,7 +139,6 @@ struct kiocb {
(x)->ki_dtor = NULL; \
(x)->ki_obj.tsk = tsk; \
(x)->ki_user_data = 0; \
- init_wait((&(x)->ki_wait)); \
} while (0)

#define AIO_RING_MAGIC 0xa10a10a1
@@ -223,8 +221,6 @@ struct mm_struct;
static inline void exit_aio(struct mm_struct *mm) { }
#endif /* CONFIG_AIO */

-#define io_wait_to_kiocb(wait) container_of(wait, struct kiocb, ki_wait)
-
static inline struct kiocb *list_kiocb(struct list_head *h)
{
return list_entry(h, struct kiocb, ki_list);