The aio_ring_empty() function returns true if the AIO event ring has no
elements, false otherwise.
Signed-off-by: Davi E. M. Arnaut <[email protected]>
---
fs/aio.c | 17 +++++++++++++++++
include/linux/aio.h | 1 +
2 files changed, 18 insertions(+)
Index: linux-2.6/fs/aio.c
===================================================================
--- linux-2.6.orig/fs/aio.c
+++ linux-2.6/fs/aio.c
@@ -1004,6 +1004,23 @@ put_rq:
return ret;
}
+int fastcall aio_ring_empty(struct kioctx *ioctx)
+{
+ struct aio_ring_info *info = &ioctx->ring_info;
+ struct aio_ring *ring;
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&ioctx->ctx_lock, flags);
+ ring = kmap_atomic(info->ring_pages[0], KM_IRQ1);
+ if (ring->head == ring->tail)
+ ret = 1;
+ kunmap_atomic(ring, KM_IRQ1);
+ spin_unlock_irqrestore(&ioctx->ctx_lock, flags);
+
+ return ret;
+}
+
/* aio_read_evt
* Pull an event off of the ioctx's event ring. Returns the number of
* events fetched (0 or 1 ;-)
Index: linux-2.6/include/linux/aio.h
===================================================================
--- linux-2.6.orig/include/linux/aio.h
+++ linux-2.6/include/linux/aio.h
@@ -202,6 +202,7 @@ extern unsigned aio_max_size;
extern ssize_t FASTCALL(wait_on_sync_kiocb(struct kiocb *iocb));
extern int FASTCALL(aio_put_req(struct kiocb *iocb));
+extern int FASTCALL(aio_ring_empty(struct kioctx *ioctx));
extern void FASTCALL(kick_iocb(struct kiocb *iocb));
extern int FASTCALL(aio_complete(struct kiocb *iocb, long res, long res2));
extern void FASTCALL(__put_ioctx(struct kioctx *ctx));
--
-
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