/*
* If the user tries to overwrite our disklabel through an open partition
* or via a magicwrite config call, we end up here and try to prevent
* footshooting as best we can.
*/
static void
g_bsd_hotwrite(void *arg, int flag)
{
struct bio *bp;
struct g_geom *gp;
struct g_slicer *gsp;
struct g_slice *gsl;
struct g_bsd_softc *ms;
u_char *p;
int error;
g_topology_assert();
/*
* We should never get canceled, because that would amount to a removal
* of the geom while there was outstanding I/O requests.
*/
KASSERT(flag != EV_CANCEL, ("g_bsd_hotwrite cancelled"));
bp = arg;
gp = bp->bio_to->geom;
gsp = gp->softc;
ms = gsp->softc;
gsl = &gsp->slices[bp->bio_to->index];
p = (u_char*)bp->bio_data + ms->labeloffset -
(bp->bio_offset + gsl->offset);
error = g_bsd_modify(gp, p);
if (error) {
g_io_deliver(bp, EPERM);
return;
}
g_slice_finish_hot(bp);
}
static void
g_sunlabel_hotwrite(void *arg, int flag)
{
struct bio *bp;
struct g_geom *gp;
struct g_slicer *gsp;
struct g_slice *gsl;
struct g_sunlabel_softc *ms;
u_char *p;
int error;
KASSERT(flag != EV_CANCEL, ("g_sunlabel_hotwrite cancelled"));
bp = arg;
gp = bp->bio_to->geom;
gsp = gp->softc;
ms = gsp->softc;
gsl = &gsp->slices[bp->bio_to->index];
/*
* XXX: For all practical purposes, this whould be equvivalent to
* XXX: "p = (u_char *)bp->bio_data;" because the label is always
* XXX: in the first sector and we refuse sectors smaller than the
* XXX: label.
*/
p = (u_char *)bp->bio_data - (bp->bio_offset + gsl->offset);
error = g_sunlabel_modify(gp, ms, p);
if (error) {
g_io_deliver(bp, EPERM);
return;
}
g_slice_finish_hot(bp);
}
