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Revert r269814: blkfront: add support for unmapped IO

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Current busdma code for unmapped bios will not properly align the segment
size, causing corruption on blkfront devices. Revert the commit until
busdma code is fixed.

Reported by:	mav
MFC after:	1 day
This commit is contained in:
royger 2014-09-04 14:56:24 +00:00
parent f7c94cc497
commit 6d24ae3be3
1 changed files with 5 additions and 7 deletions
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12
sys/dev/xen/blkfront/blkfront.c
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@ -272,12 +272,8 @@ xbd_queue_request(struct xbd_softc *sc, struct xbd_command *cm)
{
int error;
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);
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
@ -337,6 +333,8 @@ 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) {
@ -995,7 +993,7 @@ 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 = DISKFLAG_UNMAPPED_BIO;
sc->xbd_disk->d_flags = 0;
if ((sc->xbd_flags & (XBDF_FLUSH|XBDF_BARRIER)) != 0) {
sc->xbd_disk->d_flags |= DISKFLAG_CANFLUSHCACHE;
device_printf(sc->xbd_dev,