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Allow to dump kernel to gmirror providers.

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Some conditions have to be met to make it work properly. This will be
described in the manual page.

MFC after:	3 days
This commit is contained in:
Pawel Jakub Dawidek 2006-03-08 08:27:33 +00:00
parent 62a59e8f0d
commit 4686187543
1 changed files with 37 additions and 0 deletions
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37
sys/geom/mirror/g_mirror.c
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@ -984,6 +984,38 @@ g_mirror_sync_done(struct bio *bp)
mtx_unlock(&sc->sc_queue_mtx);
}
static void
g_mirror_kernel_dump(struct bio *bp)
{
struct g_mirror_softc *sc;
struct g_mirror_disk *disk;
struct bio *cbp;
struct g_kerneldump *gkd;
/*
* We configure dumping to the first component, because this component
* will be used for reading with 'prefer' balance algorithm.
* If the component with the higest priority is currently disconnected
* we will not be able to read the dump after the reboot if it will be
* connected and synchronized later. Can we do something better?
*/
sc = bp->bio_to->geom->softc;
disk = LIST_FIRST(&sc->sc_disks);
gkd = (struct g_kerneldump *)bp->bio_data;
if (gkd->length > bp->bio_to->mediasize)
gkd->length = bp->bio_to->mediasize;
cbp = g_clone_bio(bp);
if (cbp == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
cbp->bio_done = g_std_done;
g_io_request(cbp, disk->d_consumer);
G_MIRROR_DEBUG(1, "Kernel dump will go to %s.",
g_mirror_get_diskname(disk));
}
static void
g_mirror_start(struct bio *bp)
{
@ -1005,6 +1037,11 @@ g_mirror_start(struct bio *bp)
case BIO_DELETE:
break;
case BIO_GETATTR:
if (strcmp("GEOM::kerneldump", bp->bio_attribute) == 0) {
g_mirror_kernel_dump(bp);
return;
}
/* FALLTHROUGH */
default:
g_io_deliver(bp, EOPNOTSUPP);
return;