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freebsd-nq/sys/dev/vinum/vinum.c
Peter Wemm a4bc95cff9 Move the kld stuff to here.
1998-10-23 11:49:47 +00:00

547 lines
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/*-
* Copyright (c) 1997, 1998
* Nan Yang Computer Services Limited. All rights reserved.
*
* 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 1998/09/16 05:56:21 grog Exp $
*/
#define STATIC /* nothing while we're testing XXX */
#define REALLYKERNEL
#include "vinumhdr.h"
#include "sys/sysproto.h" /* for sync(2) */
#ifdef DEBUG
#include <sys/reboot.h>
int debug = 0;
#endif
/* pointer to ioctl p parameter, to save passing it around */
struct proc *myproc;
#if __FreeBSD__ < 3
STATIC struct cdevsw vinum_cdevsw;
STATIC struct bdevsw vinum_bdevsw =
{
vinumopen, vinumclose, vinumstrategy, vinumioctl,
vinumdump, vinumsize, 0,
"vinum", &vinum_cdevsw, -1
};
#else /* goodbye, bdevsw */
STATIC struct cdevsw vinum_cdevsw =
{
vinumopen, vinumclose, vinumread, vinumwrite,
vinumioctl, nostop, nullreset, nodevtotty,
seltrue, nommap, vinumstrategy, "vinum",
NULL, -1, vinumdump, vinumsize,
D_DISK, 0, -1
};
#endif
/* Called by main() during pseudo-device attachment. */
STATIC void vinumattach(void *);
STATIC void vinumgetdisklabel(dev_t);
void vinum_scandisk(void);
int vinum_inactive(void);
void free_vinum(int);
#ifndef ACTUALLY_LKM_NOT_KERNEL
STATIC int vinum_modevent(module_t mod, modeventtype_t type, void *unused);
#endif
#if __FreeBSD__ >= 3
/* Why aren't these declared anywhere? XXX */
int setjmp(jmp_buf);
void longjmp(jmp_buf, int);
#endif
extern jmp_buf command_fail; /* return here if config fails */
struct _vinum_conf vinum_conf; /* configuration information */
STATIC int vinum_devsw_installed = 0;
/*
* 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)
{
BROKEN_GDB;
char *buf; /* pointer to temporary buffer */
struct _ioctl_reply *ioctl_reply; /* struct to return */
struct uio uio;
struct iovec iovec;
/* modload should prevent multiple loads, so this is worth a panic */
if ((vinum_conf.flags & VF_LOADED) != NULL)
panic("vinum: already loaded");
printf("vinum: loaded\n");
vinum_conf.flags |= VF_LOADED; /* we're loaded now */
/* We don't have a p pointer here, so take it from curproc */
myproc = curproc;
#if __FreeBSD__ < 3
bdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &vinum_bdevsw);
#else
cdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &vinum_cdevsw);
#endif
#ifdef DEVFS
#error DEVFS not finished yet
#endif
uio.uio_iov = &iovec;
uio.uio_iovcnt = 1; /* just one buffer */
uio.uio_offset = 0; /* start at the beginning */
uio.uio_resid = 512; /* one sector */
uio.uio_segflg = UIO_SYSSPACE; /* we're in system space */
uio.uio_rw = UIO_READ; /* do we need this? */
uio.uio_procp = curproc; /* do it for our own process */
iovec.iov_len = 512;
buf = (char *) Malloc(iovec.iov_len); /* get a buffer */
CHECKALLOC(buf, "vinum: no memory\n"); /* can't get 512 bytes? */
iovec.iov_base = buf; /* read into buf */
/* allocate space: drives... */
DRIVE = (struct drive *) Malloc(sizeof(struct drive) * INITIAL_DRIVES);
CHECKALLOC(DRIVE, "vinum: no memory\n");
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");
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");
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");
vinum_conf.subdisks_allocated = INITIAL_SUBDISKS; /* number of sd slots allocated */
vinum_conf.subdisks_used = 0; /* and number in use */
ioctl_reply = NULL; /* no reply on longjmp */
}
/* Check if we have anything open. If so, return 0 (not inactive),
* otherwise 1 (inactive) */
int
vinum_inactive(void)
{
BROKEN_GDB;
int i;
int can_do = 1; /* assume we can do it */
lock_config();
for (i = 0; i < vinum_conf.volumes_used; i++) {
if (VOL[i].pid != NULL) { /* 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)
{
BROKEN_GDB;
int i;
if (cleardrive) {
for (i = 0; i < vinum_conf.drives_used; i++)
remove_drive(i); /* remove the drive */
} else { /* keep the config */
save_config();
if (DRIVE != NULL) {
for (i = 0; i < vinum_conf.drives_used; i++)
free_drive(&DRIVE[i]); /* close files and things */
Free(DRIVE);
}
}
if (SD != NULL)
Free(SD);
if (PLEX != NULL) {
for (i = 0; i < vinum_conf.plexes_used; i++) {
struct plex *plex = &vinum_conf.plex[i];
if (plex->state != plex_unallocated) { /* we have real data there */
if (plex->sdnos)
Free(plex->sdnos);
if (plex->unmapped_regions)
Free(plex->unmapped_region);
if (plex->defective_regions)
Free(plex->defective_region);
}
}
Free(PLEX);
}
if (VOL != NULL)
Free(VOL);
bzero(&vinum_conf, sizeof(vinum_conf));
}
#ifdef ACTUALLY_LKM_NOT_KERNEL /* stuff for LKMs */
MOD_MISC(vinum);
/*
* Function called when loading the driver.
*/
STATIC int
vinum_load(struct lkm_table *lkmtp, int cmd)
{
BROKEN_GDB;
/* Debugger ("vinum_load"); */
vinumattach(NULL);
return 0; /* OK */
}
/*
* Function called when unloading the driver.
*/
STATIC int
vinum_unload(struct lkm_table *lkmtp, int cmd)
{
BROKEN_GDB;
if (vinum_inactive()) { /* is anything open? */
struct sync_args dummyarg =
{0};
#if __FreeBSD__ < 3
int retval;
#endif
printf("vinum: unloaded\n");
#if __FreeBSD__ < 3
sync(curproc, &dummyarg, &retval); /* write out buffers */
#else
sync(curproc, &dummyarg); /* write out buffers */
#endif
free_vinum(0); /* no: clean up */
#if __FreeBSD__ < 3
bdevsw[BDEV_MAJOR] = NULL; /* clear bdevsw */
#endif
cdevsw[CDEV_MAJOR] = NULL; /* and cdevsw */
return 0;
} else
return EBUSY;
}
/*
* Dispatcher function for the module (load/unload/stat).
*/
int
vinum_mod(struct lkm_table *lkmtp, int cmd, int ver)
{
BROKEN_GDB;
MOD_DISPATCH(vinum, /* module name */
lkmtp, /* LKM table */
cmd, /* command */
ver,
vinum_load, /* load with this function */
vinum_unload, /* and unload with this */
lkm_nullcmd);
}
#else /* not LKM */
STATIC int
vinum_modevent(module_t mod, modeventtype_t type, void *unused)
{
struct sync_args dummyarg = {0};
BROKEN_GDB;
switch (type) {
case MOD_LOAD:
/* Debugger ("vinum_load"); */
vinumattach(NULL);
return 0; /* OK */
case MOD_UNLOAD:
if (!vinum_inactive()) /* is anything open? */
return EBUSY;
sync(curproc, &dummyarg); /* write out buffers */
free_vinum(0); /* no: clean up */
cdevsw[CDEV_MAJOR] = NULL; /* and cdevsw */
return 0;
default:
break;
}
return 0;
}
moduledata_t vinum_mod = {
"vinum",
vinum_modevent,
0
};
DECLARE_MODULE(vinum, vinum_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
#endif /* LKM */
/* ARGSUSED */
/* Open a vinum object
* At the moment, we only open volumes and the
* super device. It's a nice concept to be
* able to open drives, subdisks and plexes, but
* I can't think what good it could be */
int
vinumopen(dev_t dev,
int flags,
int fmt,
struct proc *p)
{
BROKEN_GDB;
int s; /* spl */
int error;
unsigned int index;
struct volume *vol;
struct plex *plex;
struct sd *sd;
struct devcode *device;
device = (struct devcode *) &dev;
error = 0;
/* First, decide what we're looking at */
switch (device->type) {
case VINUM_VOLUME_TYPE:
index = VOLNO(dev);
if (index >= vinum_conf.volumes_used)
return ENXIO; /* no such device */
vol = &VOL[index];
switch (vol->state) {
case volume_unallocated:
case volume_uninit:
return ENXIO;
case volume_up:
s = splhigh(); /* quick lock */
if (error)
return error;
if (vol->opencount == 0)
vol->openflags = flags; /* set our flags */
vol->opencount++;
vol->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
splx(s);
return 0;
case volume_down:
return EIO;
default:
return EINVAL;
}
case VINUM_PLEX_TYPE:
if (VOLNO(dev) >= vinum_conf.volumes_used)
return ENXIO;
index = PLEXNO(dev); /* get plex index in vinum_conf */
if (index >= vinum_conf.plexes_used)
return ENXIO; /* no such device */
plex = &PLEX[index];
switch (plex->state) {
case plex_unallocated:
return EINVAL;
default:
s = splhigh();
if (plex->pid /* it's open already */
&& (plex->pid != p->p_pid)) { /* and not by us, */
splx(s);
return EBUSY; /* one at a time, please */
}
plex->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
splx(s);
return 0;
}
case VINUM_SD_TYPE:
if ((VOLNO(dev) >= vinum_conf.volumes_used) || /* no such volume */
(PLEXNO(dev) >= vinum_conf.plexes_used)) /* or no such plex */
return ENXIO; /* no such device */
index = SDNO(dev); /* get the subdisk number */
if (index >= vinum_conf.subdisks_used)
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:
case sd_uninit:
return EINVAL;
default:
s = splhigh();
if (sd->pid /* it's open already */
&& (sd->pid != p->p_pid)) { /* and not by us, */
splx(s);
return EBUSY; /* one at a time, please */
}
sd->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
splx(s);
return 0;
}
case VINUM_DRIVE_TYPE:
default:
return ENODEV; /* don't know what to do with these */
case VINUM_SUPERDEV_TYPE:
if (p->p_ucred->cr_uid == 0) { /* root calling, */
vinum_conf.opencount++; /* one more opener */
return 0; /* no worries opening super dev */
} else
return EPERM; /* you can't do that! */
}
}
/* ARGSUSED */
int
vinumclose(dev_t dev,
int flags,
int fmt,
struct proc *p)
{
BROKEN_GDB;
unsigned int index;
struct volume *vol;
struct plex *plex;
struct sd *sd;
struct devcode *device = (struct devcode *) &dev;
index = VOLNO(dev);
/* First, decide what we're looking at */
switch (device->type) {
case VINUM_VOLUME_TYPE:
if (index >= vinum_conf.volumes_used)
return ENXIO; /* no such device */
vol = &VOL[index];
switch (vol->state) {
case volume_unallocated:
case volume_uninit:
return ENXIO;
case volume_up:
vol->opencount = 0; /* reset our flags */
vol->pid = NULL; /* and forget who owned us */
return 0;
case volume_down:
return EIO;
default:
return EINVAL;
}
case VINUM_PLEX_TYPE:
if (VOLNO(dev) >= vinum_conf.volumes_used)
return ENXIO;
index = PLEXNO(dev); /* get plex index in vinum_conf */
if (index >= vinum_conf.plexes_used)
return ENXIO; /* no such device */
plex = &PLEX[index];
plex->pid = 0;
return 0;
case VINUM_SD_TYPE:
if ((VOLNO(dev) >= vinum_conf.volumes_used) || /* no such volume */
(PLEXNO(dev) >= vinum_conf.plexes_used)) /* or no such plex */
return ENXIO; /* no such device */
index = SDNO(dev); /* get the subdisk number */
if (index >= vinum_conf.subdisks_used)
return ENXIO; /* no such device */
sd = &SD[index];
sd->pid = 0;
return 0;
case VINUM_SUPERDEV_TYPE:
if (p->p_ucred->cr_uid == 0) /* root calling, */
vinum_conf.opencount--; /* one less opener */
return 0; /* no worries closing super dev */
case VINUM_DRIVE_TYPE:
default:
return ENODEV; /* don't know what to do with these */
}
}
/* size routine */
int
vinumsize(dev_t dev)
{
BROKEN_GDB;
struct volume *vol;
int size;
/* XXX This is bogus. We don't need to open
* a device to find its 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)
{
/* Not implemented. */
return ENXIO;
}
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