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Add unmapped IO support to virtio_blk(4)

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This commit is contained in:
Bryan Venteicher 2014-01-13 04:43:01 +00:00
parent fb6c25186b
commit ee11ec3437
1 changed files with 4 additions and 3 deletions
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7
sys/dev/virtio/block/virtio_blk.c
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@ -726,7 +726,7 @@ vtblk_alloc_disk(struct vtblk_softc *sc, struct virtio_blk_config *blkcfg)
dp->d_name = VTBLK_DISK_NAME;
dp->d_unit = device_get_unit(dev);
dp->d_drv1 = sc;
dp->d_flags = DISKFLAG_CANFLUSHCACHE;
dp->d_flags = DISKFLAG_CANFLUSHCACHE | DISKFLAG_UNMAPPED_BIO;
dp->d_hba_vendor = virtio_get_vendor(dev);
dp->d_hba_device = virtio_get_device(dev);
dp->d_hba_subvendor = virtio_get_subvendor(dev);
@ -931,10 +931,11 @@ vtblk_execute_request(struct vtblk_softc *sc, struct vtblk_request *req)
sglist_append(sg, &req->vbr_hdr, sizeof(struct virtio_blk_outhdr));
if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) {
error = sglist_append(sg, bp->bio_data, bp->bio_bcount);
if (error || sg->sg_nseg == sg->sg_maxseg)
error = sglist_append_bio(sg, bp);
if (error || sg->sg_nseg == sg->sg_maxseg) {
panic("%s: data buffer too big bio:%p error:%d",
__func__, bp, error);
}
/* BIO_READ means the host writes into our buffer. */
if (bp->bio_cmd == BIO_READ)