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MFC r269814:

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blkfront: add support for unmapped IO

Sponsored by:	Citrix Systems R&D
Tested by:	robak
PR:		191173
This commit is contained in:
royger 2014-08-18 08:50:05 +00:00
parent 23b6125361
commit b8303841b8
1 changed files with 7 additions and 5 deletions
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12
sys/dev/xen/blkfront/blkfront.c
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@ -272,8 +272,12 @@ xbd_queue_request(struct xbd_softc *sc, struct xbd_command *cm)
{
int error;
error = bus_dmamap_load(sc->xbd_io_dmat, cm->cm_map, cm->cm_data,
cm->cm_datalen, xbd_queue_cb, cm, 0);
if (cm->cm_bp != NULL)
error = bus_dmamap_load_bio(sc->xbd_io_dmat, cm->cm_map,
cm->cm_bp, xbd_queue_cb, cm, 0);
else
error = bus_dmamap_load(sc->xbd_io_dmat, cm->cm_map,
cm->cm_data, cm->cm_datalen, xbd_queue_cb, cm, 0);
if (error == EINPROGRESS) {
/*
* Maintain queuing order by freezing the queue. The next
@ -333,8 +337,6 @@ xbd_bio_command(struct xbd_softc *sc)
}
cm->cm_bp = bp;
cm->cm_data = bp->bio_data;
cm->cm_datalen = bp->bio_bcount;
cm->cm_sector_number = (blkif_sector_t)bp->bio_pblkno;
switch (bp->bio_cmd) {
@ -993,7 +995,7 @@ xbd_instance_create(struct xbd_softc *sc, blkif_sector_t sectors,
sc->xbd_disk->d_mediasize = sectors * sector_size;
sc->xbd_disk->d_maxsize = sc->xbd_max_request_size;
sc->xbd_disk->d_flags = 0;
sc->xbd_disk->d_flags = DISKFLAG_UNMAPPED_BIO;
if ((sc->xbd_flags & (XBDF_FLUSH|XBDF_BARRIER)) != 0) {
sc->xbd_disk->d_flags |= DISKFLAG_CANFLUSHCACHE;
device_printf(sc->xbd_dev,