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Differential D27225 Diff 79631 sys/dev/xen/blkfront/blkfront.c

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sys/dev/xen/blkfront/blkfront.c

Show First 20 Lines • Show All 1,300 Lines • ▼ Show 20 Linesxbd_connect(struct xbd_softc *sc)
err = xs_gather(XST_NIL, xenbus_get_otherend_path(dev), err = xs_gather(XST_NIL, xenbus_get_otherend_path(dev),
"feature-max-indirect-segments", "%" PRIu32, "feature-max-indirect-segments", "%" PRIu32,
&sc->xbd_max_request_segments, NULL); &sc->xbd_max_request_segments, NULL);
if ((err != 0) || (xbd_enable_indirect == 0)) if ((err != 0) || (xbd_enable_indirect == 0))
sc->xbd_max_request_segments = 0; sc->xbd_max_request_segments = 0;
if (sc->xbd_max_request_segments > XBD_MAX_INDIRECT_SEGMENTS) if (sc->xbd_max_request_segments > XBD_MAX_INDIRECT_SEGMENTS)
sc->xbd_max_request_segments = XBD_MAX_INDIRECT_SEGMENTS; sc->xbd_max_request_segments = XBD_MAX_INDIRECT_SEGMENTS;
if (sc->xbd_max_request_segments > XBD_SIZE_TO_SEGS(MAXPHYS)) if (sc->xbd_max_request_segments > XBD_SIZE_TO_SEGS(maxphys))
sc->xbd_max_request_segments = XBD_SIZE_TO_SEGS(MAXPHYS); sc->xbd_max_request_segments = XBD_SIZE_TO_SEGS(maxphys);
sc->xbd_max_request_indirectpages = sc->xbd_max_request_indirectpages =
XBD_INDIRECT_SEGS_TO_PAGES(sc->xbd_max_request_segments); XBD_INDIRECT_SEGS_TO_PAGES(sc->xbd_max_request_segments);
if (sc->xbd_max_request_segments < BLKIF_MAX_SEGMENTS_PER_REQUEST) if (sc->xbd_max_request_segments < BLKIF_MAX_SEGMENTS_PER_REQUEST)
sc->xbd_max_request_segments = BLKIF_MAX_SEGMENTS_PER_REQUEST; sc->xbd_max_request_segments = BLKIF_MAX_SEGMENTS_PER_REQUEST;
sc->xbd_max_request_size = sc->xbd_max_request_size =
XBD_SEGS_TO_SIZE(sc->xbd_max_request_segments); XBD_SEGS_TO_SIZE(sc->xbd_max_request_segments);
/* Allocate datastructures based on negotiated values. */ /* Allocate datastructures based on negotiated values. */
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