NetBSD/sys/dev/vinum/vinum.c

414 lines
12 KiB
C

/*-
* Copyright (c) 1997, 1998
* Nan Yang Computer Services Limited. All rights reserved.
*
* Written by Greg Lehey
*
* This software is distributed under the so-called ``Berkeley
* License'':
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Nan Yang Computer
* Services Limited.
* 4. Neither the name of the Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* This software is provided ``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 company 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.
*
* $Id: vinum.c,v 1.1.1.1 2003/10/10 03:07:37 grog Exp $
* $FreeBSD$
*/
#define STATIC static /* nothing while we're testing XXX */
#include <dev/vinum/vinumhdr.h>
#ifdef VINUMDEBUG
#include <sys/reboot.h>
int debug = 0;
extern int total_malloced;
extern int malloccount;
extern struct mc malloced[];
#endif
#include <dev/vinum/request.h>
const struct cdevsw vinum_cdevsw =
{
vinumopen, vinumclose, vinumread, vinumwrite, vinumioctl,
nostop, notty, nopoll, nommap, nokqfilter, D_DISK
};
const struct bdevsw vinum_bdevsw =
{
vinumopen, vinumclose, vinumstrategy, vinumioctl,
nodump, vinumsize, D_DISK
};
/* Called by main() during pseudo-device attachment. */
void vinumattach(void *);
struct _vinum_conf vinum_conf; /* configuration information */
/*
* Called by main() during pseudo-device attachment. All we need
* to do is allocate enough space for devices to be configured later, and
* add devsw entries.
*/
void
vinumattach(void *dummy)
{
/* modload should prevent multiple loads, so this is worth a panic */
if ((vinum_conf.flags & VF_LOADED) != 0)
panic("vinum: already loaded");
log(LOG_INFO, "vinum: loaded\n");
#ifdef VINUMDEBUG
vinum_conf.flags |= VF_LOADED | VF_HASDEBUG; /* we're loaded now, and we support debug */
#else
vinum_conf.flags |= VF_LOADED; /* we're loaded now */
#endif
daemonq = NULL; /* initialize daemon's work queue */
dqend = NULL;
vinum_conf.version = VINUMVERSION; /* note what version we are */
/* allocate space: drives... */
DRIVE = (struct drive *) Malloc(sizeof(struct drive) * INITIAL_DRIVES);
CHECKALLOC(DRIVE, "vinum: no memory\n");
bzero(DRIVE, sizeof(struct drive) * INITIAL_DRIVES);
vinum_conf.drives_allocated = INITIAL_DRIVES; /* number of drive slots allocated */
vinum_conf.drives_used = 0; /* and number in use */
/* volumes, ... */
VOL = (struct volume *) Malloc(sizeof(struct volume) * INITIAL_VOLUMES);
CHECKALLOC(VOL, "vinum: no memory\n");
bzero(VOL, sizeof(struct volume) * INITIAL_VOLUMES);
vinum_conf.volumes_allocated = INITIAL_VOLUMES; /* number of volume slots allocated */
vinum_conf.volumes_used = 0; /* and number in use */
/* plexes, ... */
PLEX = (struct plex *) Malloc(sizeof(struct plex) * INITIAL_PLEXES);
CHECKALLOC(PLEX, "vinum: no memory\n");
bzero(PLEX, sizeof(struct plex) * INITIAL_PLEXES);
vinum_conf.plexes_allocated = INITIAL_PLEXES; /* number of plex slots allocated */
vinum_conf.plexes_used = 0; /* and number in use */
/* and subdisks */
SD = (struct sd *) Malloc(sizeof(struct sd) * INITIAL_SUBDISKS);
CHECKALLOC(SD, "vinum: no memory\n");
bzero(SD, sizeof(struct sd) * INITIAL_SUBDISKS);
vinum_conf.subdisks_allocated = INITIAL_SUBDISKS; /* number of sd slots allocated */
vinum_conf.subdisks_used = 0; /* and number in use */
}
/*
* Check if we have anything open. If confopen is != 0,
* that goes for the super device as well, otherwise
* only for volumes.
*
* Return 0 if not inactive, 1 if inactive.
*/
int
vinum_inactive(int confopen)
{
int i;
int can_do = 1; /* assume we can do it */
if (confopen && (vinum_conf.flags & VF_OPEN)) /* open by vinum(8)? */
return 0; /* can't do it while we're open */
lock_config();
for (i = 0; i < vinum_conf.volumes_allocated; i++) {
if ((VOL[i].state > volume_down)
&& (VOL[i].flags & VF_OPEN)) { /* volume is open */
can_do = 0;
break;
}
}
unlock_config();
return can_do;
}
/*
* Free all structures.
* If cleardrive is 0, save the configuration; otherwise
* remove the configuration from the drive.
*
* Before coming here, ensure that no volumes are open.
*/
void
free_vinum(int cleardrive)
{
int i;
int drives_allocated = vinum_conf.drives_allocated;
if (DRIVE != NULL) {
if (cleardrive) { /* remove the vinum config */
for (i = 0; i < drives_allocated; i++)
remove_drive(i); /* remove the drive */
} else { /* keep the config */
for (i = 0; i < drives_allocated; i++)
free_drive(&DRIVE[i]); /* close files and things */
}
Free(DRIVE);
}
while ((vinum_conf.flags & (VF_STOPPING | VF_DAEMONOPEN))
== (VF_STOPPING | VF_DAEMONOPEN)) { /* at least one daemon open, we're stopping */
queue_daemon_request(daemonrq_return, (union daemoninfo) 0); /* stop the daemon */
tsleep(&vinumclose, PUSER, "vstop", 1); /* and wait for it */
}
if (SD != NULL) {
for (i = 0; i < vinum_conf.subdisks_allocated; i++) {
struct sd *sd = &SD[i];
if (sd->state != sd_unallocated)
free_sd(i);
}
Free(SD);
}
if (PLEX != NULL) {
for (i = 0; i < vinum_conf.plexes_allocated; i++) {
struct plex *plex = &PLEX[i];
if (plex->state != plex_unallocated) /* we have real data there */
free_plex(i);
}
Free(PLEX);
}
if (VOL != NULL) {
for (i = 0; i < vinum_conf.volumes_allocated; i++) {
struct volume *volume = &VOL[i];
if (volume->state != volume_unallocated)
free_volume(i);
}
Free(VOL);
}
bzero(&vinum_conf, sizeof(vinum_conf));
vinum_conf.version = VINUMVERSION; /* reinstate version number */
}
/* ARGSUSED */
/* Open a vinum object */
int
vinumopen(dev_t dev,
int flags,
int fmt,
struct proc *p)
{
int error;
unsigned int index;
struct volume *vol;
struct plex *plex;
struct sd *sd;
int devminor; /* minor number */
devminor = minor(dev);
error = 0;
/* First, decide what we're looking at */
switch (DEVTYPE(dev)) {
case VINUM_VOLUME_TYPE:
/*
* The super device and daemon device are the last two
* volume numbers, so check for them first.
*/
if ((devminor == VINUM_DAEMON_VOL) /* daemon device */
||(devminor == VINUM_SUPERDEV_VOL)) { /* or normal super device */
error = suser(p->p_ucred, &p->p_acflag); /* are we root? */
if (error == 0) { /* yes, can do */
if (devminor == VINUM_DAEMON_VOL) /* daemon device */
vinum_conf.flags |= VF_DAEMONOPEN; /* we're open */
else if (devminor == VINUM_SUPERDEV_VOL)
vinum_conf.flags |= VF_OPEN; /* we're open */
}
return error;
}
/* Must be a real volume. Check. */
index = Volno(dev);
if (index >= vinum_conf.volumes_allocated)
return ENXIO; /* no such device */
vol = &VOL[index];
switch (vol->state) {
case volume_unallocated:
case volume_uninit:
return ENXIO;
case volume_up:
vol->flags |= VF_OPEN; /* note we're open */
return 0;
case volume_down:
return EIO;
default:
return EINVAL;
}
case VINUM_PLEX_TYPE:
index = Plexno(dev); /* get plex index in vinum_conf */
if (index >= vinum_conf.plexes_allocated)
return ENXIO; /* no such device */
plex = &PLEX[index];
switch (plex->state) {
case plex_unallocated:
return ENXIO;
case plex_referenced:
return EINVAL;
default:
plex->flags |= VF_OPEN; /* note we're open */
return 0;
}
case VINUM_SD_TYPE:
case VINUM_SD2_TYPE:
index = Sdno(dev); /* get the subdisk number */
if (index >= vinum_conf.subdisks_allocated) /* not a valid SD entry */
return ENXIO; /* no such device */
sd = &SD[index];
/*
* Opening a subdisk is always a special operation, so
* we ignore the state as long as it represents a real
* subdisk.
*/
switch (sd->state) {
case sd_unallocated:
return ENXIO;
case sd_uninit:
case sd_referenced:
return EINVAL;
default:
sd->flags |= VF_OPEN; /* note we're open */
return 0;
}
}
return 0; /* to keep the compiler happy */
}
/* ARGSUSED */
int
vinumclose(dev_t dev,
int flags,
int fmt,
struct proc *p)
{
unsigned int index;
struct volume *vol;
int devminor;
devminor = minor(dev);
/* First, decide what we're looking at */
switch (DEVTYPE(dev)) {
case VINUM_VOLUME_TYPE:
/*
* The super device and daemon device are the last two
* volume numbers, so check for them first.
*/
if ((devminor == VINUM_DAEMON_VOL) /* daemon device */
||(devminor == VINUM_SUPERDEV_VOL)) { /* or normal super device */
/*
* don't worry about whether we're root:
* nobody else would get this far.
*/
if (devminor == VINUM_SUPERDEV_VOL) /* normal superdev */
vinum_conf.flags &= ~VF_OPEN; /* no longer open */
else { /* the daemon device */
vinum_conf.flags &= ~VF_DAEMONOPEN; /* no longer open */
if (vinum_conf.flags & VF_STOPPING) /* we're trying to stop, */
wakeup(&vinumclose); /* we can continue now */
}
return 0;
}
/* Real volume */
index = Volno(dev);
if (index >= vinum_conf.volumes_allocated)
return ENXIO; /* no such device */
vol = &VOL[index];
switch (vol->state) {
case volume_unallocated:
case volume_uninit:
return ENXIO;
case volume_up:
vol->flags &= ~VF_OPEN; /* reset our flags */
return 0;
case volume_down:
return EIO;
default:
return EINVAL;
}
case VINUM_PLEX_TYPE:
if (Volno(dev) >= vinum_conf.volumes_allocated)
return ENXIO;
/* FALLTHROUGH */
case VINUM_SD_TYPE:
if ((Volno(dev) >= vinum_conf.volumes_allocated) || /* no such volume */
(Plexno(dev) >= vinum_conf.plexes_allocated)) /* or no such plex */
return ENXIO; /* no such device */
/* FALLTHROUGH */
default:
return ENODEV; /* don't know what to do with these */
}
}
/* size routine */
int
vinumsize(dev_t dev)
{
struct volume *vol;
int size;
vol = &VOL[Volno(dev)];
if (vol->state == volume_up)
size = vol->size;
else
return 0; /* err on the size of conservatism */
return size;
}
int
vinumdump(dev_t dev, daddr_t da, caddr_t ca, size_t size)
{
return ENXIO; /* Implement this! XXX. */
}
/* Local Variables: */
/* fill-column: 60 */
/* End: */