At least after review is done I really think this patch sopuld be folded
into the previous one.
Some more comments below:
> @@ -58,6 +58,12 @@ struct virtblk_req
> struct bio *bio;
> struct virtio_blk_outhdr out_hdr;
> struct virtio_scsi_inhdr in_hdr;
> + struct work_struct work;
> + struct virtio_blk *vblk;
I think using bio->bi_private for the virtio_blk pointer would
be cleaner.
> + bool is_flush;
> + bool req_flush;
> + bool req_data;
> + bool req_fua;
This could be a bitmap, or better even a single state field.
> +static int virtblk_bio_send_flush(struct virtio_blk *vblk,
> + struct virtblk_req *vbr)
> +static int virtblk_bio_send_data(struct virtio_blk *vblk,
> + struct virtblk_req *vbr)
These should only get the struct virtblk_req * argument as the virtio_blk
structure is easily derivable from it.
> +static inline void virtblk_bio_done_flush(struct virtio_blk *vblk,
> + struct virtblk_req *vbr)
> {
> + if (vbr->req_data) {
> + /* Send out the actual write data */
> + struct virtblk_req *_vbr;
> + _vbr = virtblk_alloc_req(vblk, GFP_NOIO);
> + if (!_vbr) {
> + bio_endio(vbr->bio, -ENOMEM);
> + goto out;
> + }
> + _vbr->req_fua = vbr->req_fua;
> + _vbr->bio = vbr->bio;
> + _vbr->vblk = vblk;
> + INIT_WORK(&_vbr->work, virtblk_bio_send_data_work);
> + queue_work(virtblk_wq, &_vbr->work);
The _vbr naming isn't too nice. Also can you explain why the original
request can't be reused in a comment here?
Also if using a state variable I think the whole code would be
a bit cleaner if the bio_done helpers are combined.
> - if (writeback && !use_bio)
> + if (writeback)
> blk_queue_flush(vblk->disk->queue, REQ_FLUSH);
Shouldn't this be REQ_FLUSH | REQ_FUA for the bio case?
Btw, did you verify that flushes really work correctly for all cases
using tracing in qemu?
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