This patch introduces these two APIs so that following
patches can support queuing I/O requests and submitting them
at batch for improving I/O performance.
Reviewed-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Ming Lei <ming....@canonical.com>
---
block.c | 17 +++++++++++++++++
include/block/block.h | 3 +++
include/block/block_int.h | 4 ++++
3 files changed, 24 insertions(+)
diff --git a/block.c b/block.c
index 217f523..6245303 100644
--- a/block.c
+++ b/block.c
@@ -1910,6 +1910,7 @@ void bdrv_drain_all(void)
bool bs_busy;
aio_context_acquire(aio_context);
+ bdrv_io_unplug(bs);
bdrv_start_throttled_reqs(bs);
bs_busy = bdrv_requests_pending(bs);
bs_busy |= aio_poll(aio_context, bs_busy);
@@ -5774,3 +5775,19 @@ bool bdrv_is_first_non_filter(BlockDriverState
*candidate)
return false;
}
+
+void bdrv_io_plug(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ if (drv && drv->bdrv_io_plug) {
+ drv->bdrv_io_plug(bs);
+ }
+}
+
+void bdrv_io_unplug(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ if (drv && drv->bdrv_io_unplug) {
+ drv->bdrv_io_unplug(bs);
+ }
+}
diff --git a/include/block/block.h b/include/block/block.h
index d0baf4f..ea627d2 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -578,4 +578,7 @@ AioContext *bdrv_get_aio_context(BlockDriverState *bs);
*/
void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
+void bdrv_io_plug(BlockDriverState *bs);
+void bdrv_io_unplug(BlockDriverState *bs);
+
#endif
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 715c761..0d75ca6 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -257,6 +257,10 @@ struct BlockDriver {
void (*bdrv_attach_aio_context)(BlockDriverState *bs,
AioContext *new_context);
+ /* io queue for linux-aio */
+ void (*bdrv_io_plug)(BlockDriverState *bs);
+ void (*bdrv_io_unplug)(BlockDriverState *bs);
+
QLIST_ENTRY(BlockDriver) list;
};
--
1.7.9.5
