freebsd-dev/sys/geom/vinum/geom_vinum_events.c
Andrey V. Elsukov ceef8f2477 Prevent non-aligned reading from provider while tasting. Reject
providers with unsupported sectorsize.

Reported by:	Joerg Wunsch
MFC after:	1 week
2011-05-25 11:14:26 +00:00

261 lines
6.6 KiB
C

/*-
* 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 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 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/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <geom/geom.h>
#include <geom/vinum/geom_vinum_var.h>
#include <geom/vinum/geom_vinum.h>
void
gv_post_event(struct gv_softc *sc, int event, void *arg1, void *arg2,
intmax_t arg3, intmax_t arg4)
{
struct gv_event *ev;
ev = g_malloc(sizeof(*ev), M_WAITOK | M_ZERO);
ev->type = event;
ev->arg1 = arg1;
ev->arg2 = arg2;
ev->arg3 = arg3;
ev->arg4 = arg4;
mtx_lock(&sc->equeue_mtx);
TAILQ_INSERT_TAIL(&sc->equeue, ev, events);
wakeup(sc);
mtx_unlock(&sc->equeue_mtx);
}
void
gv_worker_exit(struct gv_softc *sc)
{
struct gv_event *ev;
ev = g_malloc(sizeof(*ev), M_WAITOK | M_ZERO);
ev->type = GV_EVENT_THREAD_EXIT;
mtx_lock(&sc->equeue_mtx);
TAILQ_INSERT_TAIL(&sc->equeue, ev, events);
wakeup(sc);
msleep(sc->worker, &sc->equeue_mtx, PDROP, "gv_wor", 0);
}
struct gv_event *
gv_get_event(struct gv_softc *sc)
{
struct gv_event *ev;
KASSERT(sc != NULL, ("NULL sc"));
mtx_lock(&sc->equeue_mtx);
ev = TAILQ_FIRST(&sc->equeue);
mtx_unlock(&sc->equeue_mtx);
return (ev);
}
void
gv_remove_event(struct gv_softc *sc, struct gv_event *ev)
{
KASSERT(sc != NULL, ("NULL sc"));
KASSERT(ev != NULL, ("NULL ev"));
mtx_lock(&sc->equeue_mtx);
TAILQ_REMOVE(&sc->equeue, ev, events);
mtx_unlock(&sc->equeue_mtx);
}
void
gv_drive_tasted(struct gv_softc *sc, struct g_provider *pp)
{
struct g_geom *gp;
struct g_consumer *cp;
struct gv_hdr *hdr;
struct gv_drive *d;
char *buf;
int error;
hdr = NULL;
buf = NULL;
G_VINUM_DEBUG(2, "tasted drive on '%s'", pp->name);
if ((GV_CFG_OFFSET % pp->sectorsize) != 0 ||
(GV_CFG_LEN % pp->sectorsize) != 0) {
G_VINUM_DEBUG(0, "provider %s has unsupported sectorsize.",
pp->name);
return;
}
gp = sc->geom;
g_topology_lock();
cp = g_new_consumer(gp);
if (g_attach(cp, pp) != 0) {
g_destroy_consumer(cp);
g_topology_unlock();
G_VINUM_DEBUG(0, "failed to attach to provider on taste event");
return;
}
if (g_access(cp, 1, 0, 0) != 0) {
g_detach(cp);
g_destroy_consumer(cp);
g_topology_unlock();
G_VINUM_DEBUG(0, "failed to access consumer on taste event");
return;
}
g_topology_unlock();
hdr = g_malloc(GV_HDR_LEN, M_WAITOK | M_ZERO);
/* Read header and on-disk configuration. */
error = gv_read_header(cp, hdr);
if (error) {
G_VINUM_DEBUG(0, "failed to read header during taste");
goto failed;
}
/*
* Setup the drive before we parse the on-disk configuration, so that
* we already know about the drive then.
*/
d = gv_find_drive(sc, hdr->label.name);
if (d == NULL) {
d = g_malloc(sizeof(*d), M_WAITOK | M_ZERO);
strlcpy(d->name, hdr->label.name, sizeof(d->name));
strlcpy(d->device, pp->name, sizeof(d->device));
} else if (d->flags & GV_DRIVE_REFERENCED) {
strlcpy(d->device, pp->name, sizeof(d->device));
d->flags &= ~GV_DRIVE_REFERENCED;
} else {
G_VINUM_DEBUG(2, "drive '%s' is already known", d->name);
goto failed;
}
/* Add the consumer and header to the new drive. */
d->consumer = cp;
d->hdr = hdr;
gv_create_drive(sc, d);
buf = g_read_data(cp, GV_CFG_OFFSET, GV_CFG_LEN, NULL);
if (buf == NULL) {
G_VINUM_DEBUG(0, "failed to read config during taste");
goto failed;
}
gv_parse_config(sc, buf, d);
g_free(buf);
g_topology_lock();
g_access(cp, -1, 0, 0);
g_topology_unlock();
gv_setup_objects(sc);
gv_set_drive_state(d, GV_DRIVE_UP, 0);
return;
failed:
if (hdr != NULL)
g_free(hdr);
g_topology_lock();
g_access(cp, -1, 0, 0);
g_detach(cp);
g_destroy_consumer(cp);
g_topology_unlock();
}
/*
* When losing a drive (e.g. hardware failure), we cut down the consumer
* attached to the underlying device and bring the drive itself to a
* "referenced" state so that normal tasting could bring it up cleanly if it
* possibly arrives again.
*/
void
gv_drive_lost(struct gv_softc *sc, struct gv_drive *d)
{
struct g_consumer *cp;
struct gv_drive *d2;
struct gv_sd *s, *s2;
struct gv_freelist *fl, *fl2;
gv_set_drive_state(d, GV_DRIVE_DOWN,
GV_SETSTATE_FORCE | GV_SETSTATE_CONFIG);
cp = d->consumer;
if (cp != NULL) {
if (cp->nstart != cp->nend) {
G_VINUM_DEBUG(0, "dead drive '%s' has still active "
"requests, unable to detach consumer", d->name);
gv_post_event(sc, GV_EVENT_DRIVE_LOST, d, NULL, 0, 0);
return;
}
g_topology_lock();
if (cp->acr != 0 || cp->acw != 0 || cp->ace != 0)
g_access(cp, -cp->acr, -cp->acw, -cp->ace);
g_detach(cp);
g_destroy_consumer(cp);
g_topology_unlock();
}
LIST_FOREACH_SAFE(fl, &d->freelist, freelist, fl2) {
LIST_REMOVE(fl, freelist);
g_free(fl);
}
d->consumer = NULL;
g_free(d->hdr);
d->hdr = NULL;
d->flags |= GV_DRIVE_REFERENCED;
snprintf(d->device, sizeof(d->device), "???");
d->size = 0;
d->avail = 0;
d->freelist_entries = 0;
d->sdcount = 0;
/* Put the subdisk in tasted mode, and remove from drive list. */
LIST_FOREACH_SAFE(s, &d->subdisks, from_drive, s2) {
LIST_REMOVE(s, from_drive);
s->flags |= GV_SD_TASTED;
}
/*
* Don't forget that gv_is_newer wants a "real" drive at the beginning
* of the list, so, just to be safe, we shuffle around.
*/
LIST_REMOVE(d, drive);
d2 = LIST_FIRST(&sc->drives);
if (d2 == NULL)
LIST_INSERT_HEAD(&sc->drives, d, drive);
else
LIST_INSERT_AFTER(d2, d, drive);
gv_save_config(sc);
}