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virtio-blk: fix barrier support

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Before issuing the barrier to the block driver we need to flush our oustanding
queue of write requests, as the flush is supposed to be issued after them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2010-05-19 12:40:09 +02:00 • committed by Kevin Wolf
parent de6c8042ec
commit 618fbb8429
1 changed files with 13 additions and 2 deletions
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15
hw/virtio-blk.c
View file

@ -240,10 +240,20 @@ static void do_multiwrite(BlockDriverState *bs, BlockRequest *blkreq,
}
}
static void virtio_blk_handle_flush(VirtIOBlockReq *req)
static void virtio_blk_handle_flush(BlockRequest *blkreq, int *num_writes,
VirtIOBlockReq *req, BlockDriverState **old_bs)
{
BlockDriverAIOCB *acb;
/*
* Make sure all outstanding writes are posted to the backing device.
*/
if (*old_bs != NULL) {
do_multiwrite(*old_bs, blkreq, *num_writes);
}
*num_writes = 0;
*old_bs = req->dev->bs;
acb = bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req);
if (!acb) {
virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
@ -316,7 +326,8 @@ static void virtio_blk_handle_request(VirtIOBlockReq *req,
req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base;
if (req->out->type & VIRTIO_BLK_T_FLUSH) {
virtio_blk_handle_flush(req);
virtio_blk_handle_flush(mrb->blkreq, &mrb->num_writes,
req, &mrb->old_bs);
} else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) {
virtio_blk_handle_scsi(req);
} else if (req->out->type & VIRTIO_BLK_T_OUT) {