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Implement a hotspot for the sunlabel.

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This means that you can no longer trash your opened partitions by writing to
the sunlabel through another partition.  This is similar to the semantics
implemented for BSD labels.
This commit is contained in:
Poul-Henning Kamp 2003-04-21 20:14:36 +00:00
parent e72380dd09
commit 989afda211
1 changed files with 38 additions and 3 deletions
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41
sys/geom/geom_sunlabel.c
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@ -103,6 +103,41 @@ g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0)
return (0);
}
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);
g_topology_unlock();
error = g_sunlabel_modify(gp, ms, p);
g_topology_lock();
if (error) {
g_io_deliver(bp, EPERM);
return;
}
g_slice_finish_hot(bp);
}
static int
g_sunlabel_start(struct bio *bp)
{
@ -174,10 +209,10 @@ g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
if (LIST_EMPTY(&gp->provider)) {
g_std_spoiled(cp);
return (NULL);
#ifdef notyet
} else {
g_slice_conf_hot(gp, 0, 0, ms->sectorsize);
#endif
g_slice_conf_hot(gp, 0, 0, SUN_SIZE,
G_SLICE_HOT_ALLOW, G_SLICE_HOT_DENY, G_SLICE_HOT_CALL);
gsp->hot = g_sunlabel_hotwrite;
}
return (gp);
}