freebsd-dev/sys/geom/vinum/geom_vinum_volume.c
Edward Tomasz Napierala 739a9c51b0 geom(4): Fix some of the "set but not used" warnings
The few I've left in place look like potential bugs.

Sponsored By:	EPSRC
2021-12-18 11:42:34 +00:00

167 lines
4.3 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2007 Lukas Ertl
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bio.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <geom/geom.h>
#include <geom/vinum/geom_vinum_var.h>
#include <geom/vinum/geom_vinum.h>
void
gv_volume_flush(struct gv_volume *v)
{
struct gv_softc *sc;
struct bio *bp;
KASSERT(v != NULL, ("NULL v"));
sc = v->vinumconf;
KASSERT(sc != NULL, ("NULL sc"));
bp = bioq_takefirst(v->wqueue);
while (bp != NULL) {
gv_volume_start(sc, bp);
bp = bioq_takefirst(v->wqueue);
}
}
void
gv_volume_start(struct gv_softc *sc, struct bio *bp)
{
struct gv_volume *v;
struct gv_plex *p, *lp;
int numwrites;
v = bp->bio_to->private;
if (v == NULL || v->state != GV_VOL_UP) {
g_io_deliver(bp, ENXIO);
return;
}
switch (bp->bio_cmd) {
case BIO_READ:
/*
* Try to find a good plex where we can send the request to,
* round-robin-style. The plex either has to be up, or it's a
* degraded RAID5 plex. Check if we have delayed requests. Put
* this request on the delayed queue if so. This makes sure that
* we don't read old values.
*/
if (bioq_first(v->wqueue) != NULL) {
bioq_insert_tail(v->wqueue, bp);
break;
}
lp = v->last_read_plex;
if (lp == NULL)
lp = LIST_FIRST(&v->plexes);
p = LIST_NEXT(lp, in_volume);
if (p == NULL)
p = LIST_FIRST(&v->plexes);
do {
if (p == NULL) {
p = lp;
break;
}
if ((p->state > GV_PLEX_DEGRADED) ||
(p->state >= GV_PLEX_DEGRADED &&
p->org == GV_PLEX_RAID5))
break;
p = LIST_NEXT(p, in_volume);
if (p == NULL)
p = LIST_FIRST(&v->plexes);
} while (p != lp);
if ((p == NULL) ||
(p->org == GV_PLEX_RAID5 && p->state < GV_PLEX_DEGRADED) ||
(p->org != GV_PLEX_RAID5 && p->state <= GV_PLEX_DEGRADED)) {
g_io_deliver(bp, ENXIO);
return;
}
v->last_read_plex = p;
/* Hand it down to the plex logic. */
gv_plex_start(p, bp);
break;
case BIO_WRITE:
case BIO_DELETE:
/* Delay write-requests if any plex is synchronizing. */
LIST_FOREACH(p, &v->plexes, in_volume) {
if (p->flags & GV_PLEX_SYNCING) {
bioq_insert_tail(v->wqueue, bp);
return;
}
}
numwrites = 0;
/* Give the BIO to each plex of this volume. */
LIST_FOREACH(p, &v->plexes, in_volume) {
if (p->state < GV_PLEX_DEGRADED)
continue;
gv_plex_start(p, bp);
numwrites++;
}
if (numwrites == 0)
g_io_deliver(bp, ENXIO);
break;
}
}
void
gv_bio_done(struct gv_softc *sc, struct bio *bp)
{
struct gv_volume *v __diagused;
struct gv_plex *p;
struct gv_sd *s;
s = bp->bio_caller1;
KASSERT(s != NULL, ("gv_bio_done: NULL s"));
p = s->plex_sc;
KASSERT(p != NULL, ("gv_bio_done: NULL p"));
v = p->vol_sc;
KASSERT(v != NULL, ("gv_bio_done: NULL v"));
switch (p->org) {
case GV_PLEX_CONCAT:
case GV_PLEX_STRIPED:
gv_plex_normal_done(p, bp);
break;
case GV_PLEX_RAID5:
gv_plex_raid5_done(p, bp);
break;
}
gv_drive_done(s->drive_sc);
}