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Mark geom_mirror as capable of unmapped i/o

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Obtained from:	Netflix
MFC after:	3 days
This commit is contained in:
scottl 2013-06-19 21:52:32 +00:00
parent 71fe01331d
commit ecb835e525
1 changed files with 18 additions and 5 deletions
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23
sys/geom/mirror/g_mirror.c
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@ -2028,7 +2028,7 @@ static void
g_mirror_launch_provider(struct g_mirror_softc *sc)
{
struct g_mirror_disk *disk;
struct g_provider *pp;
struct g_provider *pp, *dp;
sx_assert(&sc->sc_lock, SX_LOCKED);
@ -2038,11 +2038,24 @@ g_mirror_launch_provider(struct g_mirror_softc *sc)
pp->sectorsize = sc->sc_sectorsize;
pp->stripesize = 0;
pp->stripeoffset = 0;
/* Splitting of unmapped BIO's could work but isn't implemented now */
if (sc->sc_balance != G_MIRROR_BALANCE_SPLIT)
pp->flags |= G_PF_ACCEPT_UNMAPPED;
LIST_FOREACH(disk, &sc->sc_disks, d_next) {
if (disk->d_consumer && disk->d_consumer->provider &&
disk->d_consumer->provider->stripesize > pp->stripesize) {
pp->stripesize = disk->d_consumer->provider->stripesize;
pp->stripeoffset = disk->d_consumer->provider->stripeoffset;
if (disk->d_consumer && disk->d_consumer->provider) {
dp = disk->d_consumer->provider;
if (dp->stripesize > pp->stripesize) {
pp->stripesize = dp->stripesize;
pp->stripeoffset = dp->stripeoffset;
}
/* A provider underneath us doesn't support unmapped */
if ((dp->flags & G_PF_ACCEPT_UNMAPPED) == 0) {
G_MIRROR_DEBUG(0, "cancelling unmapped "
"because of %s\n", dp->name);
pp->flags &= ~G_PF_ACCEPT_UNMAPPED;
}
}
}
sc->sc_provider = pp;