svn commit: r346516 - head/sys/geom/nop
Conrad Meyer
cem at FreeBSD.org
Mon Apr 22 03:25:51 UTC 2019
Author: cem
Date: Mon Apr 22 03:25:49 2019
New Revision: 346516
URL: https://svnweb.freebsd.org/changeset/base/346516
Log:
gnop(8): Nopify configuration as a kernel dump device
As a dummy / no-op dump device, to facilitate dumpon(8) testing.
Reviewed by: markj (earlier version)
Differential Revision: https://reviews.freebsd.org/D19991
Modified:
head/sys/geom/nop/g_nop.c
Modified: head/sys/geom/nop/g_nop.c
==============================================================================
--- head/sys/geom/nop/g_nop.c Mon Apr 22 03:19:40 2019 (r346515)
+++ head/sys/geom/nop/g_nop.c Mon Apr 22 03:25:49 2019 (r346516)
@@ -97,7 +97,43 @@ g_nop_resize(struct g_consumer *cp)
g_resize_provider(pp, size);
}
+static int
+g_nop_dumper(void *priv, void *virtual, vm_offset_t physical, off_t offset,
+ size_t length)
+{
+ return (0);
+}
+
static void
+g_nop_kerneldump(struct bio *bp, struct g_nop_softc *sc)
+{
+ struct g_kerneldump *gkd;
+ struct g_geom *gp;
+ struct g_provider *pp;
+
+ gkd = (struct g_kerneldump *)bp->bio_data;
+ gp = bp->bio_to->geom;
+ g_trace(G_T_TOPOLOGY, "%s(%s, %jd, %jd)", __func__, gp->name,
+ (intmax_t)gkd->offset, (intmax_t)gkd->length);
+
+ pp = LIST_FIRST(&gp->provider);
+
+ gkd->di.dumper = g_nop_dumper;
+ gkd->di.priv = sc;
+ gkd->di.blocksize = pp->sectorsize;
+ gkd->di.maxiosize = DFLTPHYS;
+ gkd->di.mediaoffset = sc->sc_offset + gkd->offset;
+ if (gkd->offset > sc->sc_explicitsize) {
+ g_io_deliver(bp, ENODEV);
+ return;
+ }
+ if (gkd->offset + gkd->length > sc->sc_explicitsize)
+ gkd->length = sc->sc_explicitsize - gkd->offset;
+ gkd->di.mediasize = gkd->length;
+ g_io_deliver(bp, 0);
+}
+
+static void
g_nop_start(struct bio *bp)
{
struct g_nop_softc *sc;
@@ -127,11 +163,18 @@ g_nop_start(struct bio *bp)
case BIO_GETATTR:
sc->sc_getattrs++;
if (sc->sc_physpath &&
- g_handleattr_str(bp, "GEOM::physpath", sc->sc_physpath)) {
- mtx_unlock(&sc->sc_lock);
- return;
- }
- break;
+ g_handleattr_str(bp, "GEOM::physpath", sc->sc_physpath))
+ ;
+ else if (strcmp(bp->bio_attribute, "GEOM::kerneldump") == 0)
+ g_nop_kerneldump(bp, sc);
+ else
+ /*
+ * Fallthrough to forwarding the GETATTR down to the
+ * lower level device.
+ */
+ break;
+ mtx_unlock(&sc->sc_lock);
+ return;
case BIO_FLUSH:
sc->sc_flushes++;
break;
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