[PATCH 5 of 5] bdrv_aio_readv/writev

[Andrea Arcangeli <aarcange@redhat.com>]

From: Andrea Arcangeli <aarcange@redhat.com>

bdrv_aio_readv/writev methods (depends on lower level bdrv_aio_readv).

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---

diff --git a/block.c b/block.c
--- a/block.c
+++ b/block.c
@@ -1296,6 +1296,50 @@ void bdrv_aio_cancel(BlockDriverAIOCB *a
     drv->bdrv_aio_cancel(acb);
 }
 
+BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
+				 struct iovec *iov, int iovcnt, size_t len,
+				 BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BlockDriver *drv = bs->drv;
+    BlockDriverAIOCB *ret;
+    
+
+    if (!drv)
+        return NULL;
+
+    ret = drv->bdrv_aio_readv(bs, sector_num, iov, iovcnt, len, cb, opaque);
+
+    if (ret) {
+	/* Update stats even though technically transfer has not happened. */
+	bs->rd_bytes += (unsigned) len;
+	bs->rd_ops ++;
+    }
+
+    return ret;
+}
+
+BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
+				  struct iovec *iov, int iovcnt, size_t len,
+				  BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BlockDriver *drv = bs->drv;
+    BlockDriverAIOCB *ret;
+    
+
+    if (!drv)
+        return NULL;
+
+    ret = drv->bdrv_aio_writev(bs, sector_num, iov, iovcnt, len, cb, opaque);
+
+    if (ret) {
+	/* Update stats even though technically transfer has not happened. */
+	bs->rd_bytes += (unsigned) len;
+	bs->rd_ops ++;
+    }
+
+    return ret;
+}
+
 
 /**************************************************************/
 /* async block device emulation */
diff --git a/block.h b/block.h
--- a/block.h
+++ b/block.h
@@ -85,6 +85,13 @@ int bdrv_commit(BlockDriverState *bs);
 /* async block I/O */
 typedef struct BlockDriverAIOCB BlockDriverAIOCB;
 typedef void BlockDriverCompletionFunc(void *opaque, int ret);
+typedef BlockDriverAIOCB *BlockDriverAIOIOV(BlockDriverState *bs,
+					    int64_t sector_num,
+					    struct iovec *iov,
+					    int iovnct,
+					    size_t len,
+					    BlockDriverCompletionFunc *cb,
+					    void *opaque);
 
 BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
                                 uint8_t *buf, int nb_sectors,
@@ -93,6 +100,12 @@ BlockDriverAIOCB *bdrv_aio_write(BlockDr
                                  const uint8_t *buf, int nb_sectors,
                                  BlockDriverCompletionFunc *cb, void *opaque);
 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
+BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
+				 struct iovec *iov, int iovnct, size_t len,
+				 BlockDriverCompletionFunc *cb, void *opaque);
+BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
+				  struct iovec *iov, int iovnct, size_t len,
+				  BlockDriverCompletionFunc *cb, void *opaque);
 
 int qemu_key_check(BlockDriverState *bs, const char *name);
 
diff --git a/block_int.h b/block_int.h
--- a/block_int.h
+++ b/block_int.h
@@ -55,6 +55,8 @@ struct BlockDriver {
         int64_t sector_num, const uint8_t *buf, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque);
     void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb);
+    BlockDriverAIOIOV *bdrv_aio_readv;
+    BlockDriverAIOIOV *bdrv_aio_writev;
     int aiocb_size;
 
     const char *protocol_name;