513 lines
14 KiB
C
513 lines
14 KiB
C
/*-
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* Copyright (c) 1997, 1998
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* Nan Yang Computer Services Limited. All rights reserved.
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*
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* This software is distributed under the so-called ``Berkeley
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* License'':
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Nan Yang Computer
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* Services Limited.
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* 4. Neither the name of the Company nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* This software is provided ``as is'', and any express or implied
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* warranties, including, but not limited to, the implied warranties of
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* merchantability and fitness for a particular purpose are disclaimed.
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* In no event shall the company or contributors be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* goods or services; loss of use, data, or profits; or business
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* interruption) however caused and on any theory of liability, whether
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* in contract, strict liability, or tort (including negligence or
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* otherwise) arising in any way out of the use of this software, even if
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* advised of the possibility of such damage.
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*
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* $Id: vinum.c,v 1.19 1998/08/13 05:24:02 grog Exp grog $
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*/
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#define STATIC /* nothing while we're testing XXX */
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#define REALLYKERNEL
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#include "vinumhdr.h"
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#include "sys/sysproto.h" /* for sync(2) */
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#ifdef DEBUG
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#include <sys/reboot.h>
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int debug = 0;
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#endif
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/* pointer to ioctl p parameter, to save passing it around */
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struct proc *myproc;
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#if __FreeBSD__ < 3
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STATIC struct cdevsw vinum_cdevsw;
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STATIC struct bdevsw vinum_bdevsw =
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{
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vinumopen, vinumclose, vinumstrategy, vinumioctl,
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vinumdump, vinumsize, 0,
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"vinum", &vinum_cdevsw, -1
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};
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#else /* goodbye, bdevsw */
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STATIC struct cdevsw vinum_cdevsw =
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{
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vinumopen, vinumclose, vinumread, vinumwrite,
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vinumioctl, nostop, nullreset, nodevtotty,
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seltrue, nommap, vinumstrategy, "vinum",
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NULL, -1, vinumdump, vinumsize,
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D_DISK, 0, -1
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};
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#endif
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/* Called by main() during pseudo-device attachment. */
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STATIC void vinumattach(void *);
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STATIC void vinumgetdisklabel(dev_t);
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void vinum_scandisk(void);
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int vinum_inactive(void);
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void free_vinum(int);
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#if __FreeBSD__ >= 3
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/* Why aren't these declared anywhere? XXX */
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int setjmp(jmp_buf);
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void longjmp(jmp_buf, int);
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#endif
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extern jmp_buf command_fail; /* return here if config fails */
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struct _vinum_conf vinum_conf; /* configuration information */
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STATIC int vinum_devsw_installed = 0;
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/*
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* Called by main() during pseudo-device attachment. All we need
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* to do is allocate enough space for devices to be configured later, and
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* add devsw entries.
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*/
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void
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vinumattach(void *dummy)
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{
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BROKEN_GDB;
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char *buf; /* pointer to temporary buffer */
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struct _ioctl_reply *ioctl_reply; /* struct to return */
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struct uio uio;
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struct iovec iovec;
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/* modload should prevent multiple loads, so this is worth a panic */
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if ((vinum_conf.flags & VF_LOADED) != NULL)
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panic("vinum: already loaded");
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printf("vinum: loaded\n");
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vinum_conf.flags |= VF_LOADED; /* we're loaded now */
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/* We don't have a p pointer here, so take it from curproc */
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myproc = curproc;
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#if __FreeBSD__ < 3
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bdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &vinum_bdevsw);
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#else
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cdevsw_add_generic(BDEV_MAJOR, CDEV_MAJOR, &vinum_cdevsw);
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#endif
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#ifdef DEVFS
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#error DEVFS not finished yet
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#endif
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uio.uio_iov = &iovec;
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uio.uio_iovcnt = 1; /* just one buffer */
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uio.uio_offset = 0; /* start at the beginning */
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uio.uio_resid = 512; /* one sector */
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uio.uio_segflg = UIO_SYSSPACE; /* we're in system space */
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uio.uio_rw = UIO_READ; /* do we need this? */
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uio.uio_procp = curproc; /* do it for our own process */
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iovec.iov_len = 512;
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buf = (char *) Malloc(iovec.iov_len); /* get a buffer */
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CHECKALLOC(buf, "vinum: no memory\n"); /* can't get 512 bytes? */
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iovec.iov_base = buf; /* read into buf */
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/* allocate space: drives... */
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DRIVE = (struct drive *) Malloc(sizeof(struct drive) * INITIAL_DRIVES);
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CHECKALLOC(DRIVE, "vinum: no memory\n");
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vinum_conf.drives_allocated = INITIAL_DRIVES; /* number of drive slots allocated */
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vinum_conf.drives_used = 0; /* and number in use */
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/* volumes, ... */
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VOL = (struct volume *) Malloc(sizeof(struct volume) * INITIAL_VOLUMES);
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CHECKALLOC(VOL, "vinum: no memory\n");
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vinum_conf.volumes_allocated = INITIAL_VOLUMES; /* number of volume slots allocated */
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vinum_conf.volumes_used = 0; /* and number in use */
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/* plexes, ... */
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PLEX = (struct plex *) Malloc(sizeof(struct plex) * INITIAL_PLEXES);
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CHECKALLOC(PLEX, "vinum: no memory\n");
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vinum_conf.plexes_allocated = INITIAL_PLEXES; /* number of plex slots allocated */
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vinum_conf.plexes_used = 0; /* and number in use */
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/* and subdisks */
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SD = (struct sd *) Malloc(sizeof(struct sd) * INITIAL_SUBDISKS);
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CHECKALLOC(SD, "vinum: no memory\n");
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vinum_conf.subdisks_allocated = INITIAL_SUBDISKS; /* number of sd slots allocated */
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vinum_conf.subdisks_used = 0; /* and number in use */
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ioctl_reply = NULL; /* no reply on longjmp */
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}
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#ifdef ACTUALLY_LKM_NOT_KERNEL /* stuff for LKMs */
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/* Check if we have anything open. If so, return 0 (not inactive),
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* otherwise 1 (inactive) */
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int
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vinum_inactive(void)
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{
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BROKEN_GDB;
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int i;
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int can_do = 1; /* assume we can do it */
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lock_config();
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for (i = 0; i < vinum_conf.volumes_used; i++) {
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if (VOL[i].pid != NULL) { /* volume is open */
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can_do = 0;
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break;
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}
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}
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unlock_config();
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return can_do;
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}
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/* Free all structures.
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* If cleardrive is 0, save the configuration; otherwise
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* remove the configuration from the drive.
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*
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* Before coming here, ensure that no volumes are open.
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*/
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void
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free_vinum(int cleardrive)
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{
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BROKEN_GDB;
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int i;
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if (cleardrive) {
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for (i = 0; i < vinum_conf.drives_used; i++)
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remove_drive(i); /* remove the drive */
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} else { /* keep the config */
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save_config();
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if (DRIVE != NULL) {
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for (i = 0; i < vinum_conf.drives_used; i++)
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free_drive(&DRIVE[i]); /* close files and things */
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Free(DRIVE);
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}
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}
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if (SD != NULL)
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Free(SD);
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if (PLEX != NULL) {
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for (i = 0; i < vinum_conf.plexes_used; i++) {
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struct plex *plex = &vinum_conf.plex[i];
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if (plex->state != plex_unallocated) { /* we have real data there */
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if (plex->sdnos)
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Free(plex->sdnos);
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if (plex->unmapped_regions)
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Free(plex->unmapped_region);
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if (plex->defective_regions)
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Free(plex->defective_region);
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}
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}
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Free(PLEX);
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}
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if (VOL != NULL)
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Free(VOL);
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bzero(&vinum_conf, sizeof(vinum_conf));
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}
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MOD_MISC(vinum);
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/*
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* Function called when loading the driver.
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*/
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STATIC int
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vinum_load(struct lkm_table *lkmtp, int cmd)
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{
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BROKEN_GDB;
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/* Debugger ("vinum_load"); */
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vinumattach(NULL);
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return 0; /* OK */
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}
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/*
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* Function called when unloading the driver.
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*/
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STATIC int
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vinum_unload(struct lkm_table *lkmtp, int cmd)
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{
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BROKEN_GDB;
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if (vinum_inactive()) { /* is anything open? */
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struct sync_args dummyarg =
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{0};
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#if __FreeBSD__ < 3
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int retval;
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#endif
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printf("vinum: unloaded\n");
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#if __FreeBSD__ < 3
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sync(curproc, &dummyarg, &retval); /* write out buffers */
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#else
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sync(curproc, &dummyarg); /* write out buffers */
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#endif
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free_vinum(0); /* no: clean up */
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#if __FreeBSD__ < 3
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bdevsw[BDEV_MAJOR] = NULL; /* clear bdevsw */
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#endif
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cdevsw[CDEV_MAJOR] = NULL; /* and cdevsw */
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return 0;
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} else
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return EBUSY;
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}
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/*
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* Dispatcher function for the module (load/unload/stat).
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*/
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int
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vinum_mod(struct lkm_table *lkmtp, int cmd, int ver)
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{
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BROKEN_GDB;
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MOD_DISPATCH(vinum, /* module name */
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lkmtp, /* LKM table */
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cmd, /* command */
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ver,
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vinum_load, /* load with this function */
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vinum_unload, /* and unload with this */
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lkm_nullcmd);
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}
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#else /* not LKM */
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#error "This driver must be compiled as a loadable kernel module"
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#endif /* LKM */
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/* ARGSUSED */
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/* Open a vinum object
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* At the moment, we only open volumes and the
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* super device. It's a nice concept to be
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* able to open drives, subdisks and plexes, but
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* I can't think what good it could be */
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int
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vinumopen(dev_t dev,
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int flags,
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int fmt,
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struct proc *p)
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{
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BROKEN_GDB;
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int s; /* spl */
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int error;
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unsigned int index;
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struct volume *vol;
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struct plex *plex;
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struct sd *sd;
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struct devcode *device;
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device = (struct devcode *) &dev;
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error = 0;
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/* First, decide what we're looking at */
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switch (device->type) {
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case VINUM_VOLUME_TYPE:
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index = VOLNO(dev);
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if (index >= vinum_conf.volumes_used)
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return ENXIO; /* no such device */
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vol = &VOL[index];
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switch (vol->state) {
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case volume_unallocated:
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case volume_uninit:
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return ENXIO;
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case volume_up:
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s = splhigh(); /* quick lock */
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if (error)
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return error;
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if (vol->opencount == 0)
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vol->openflags = flags; /* set our flags */
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vol->opencount++;
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vol->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
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splx(s);
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return 0;
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case volume_down:
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return EIO;
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default:
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return EINVAL;
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}
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case VINUM_PLEX_TYPE:
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if (VOLNO(dev) >= vinum_conf.volumes_used)
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return ENXIO;
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index = PLEXNO(dev); /* get plex index in vinum_conf */
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if (index >= vinum_conf.plexes_used)
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return ENXIO; /* no such device */
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plex = &PLEX[index];
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switch (plex->state) {
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case plex_unallocated:
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return EINVAL;
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default:
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s = splhigh();
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if (plex->pid /* it's open already */
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&& (plex->pid != p->p_pid)) { /* and not by us, */
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splx(s);
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return EBUSY; /* one at a time, please */
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}
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plex->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
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splx(s);
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return 0;
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}
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case VINUM_SD_TYPE:
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if ((VOLNO(dev) >= vinum_conf.volumes_used) || /* no such volume */
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(PLEXNO(dev) >= vinum_conf.plexes_used)) /* or no such plex */
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return ENXIO; /* no such device */
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index = SDNO(dev); /* get the subdisk number */
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if (index >= vinum_conf.subdisks_used)
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return ENXIO; /* no such device */
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sd = &SD[index];
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/* Opening a subdisk is always a special operation, so we
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* ignore the state as long as it represents a real subdisk */
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switch (sd->state) {
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case sd_unallocated:
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case sd_uninit:
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return EINVAL;
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default:
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s = splhigh();
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if (sd->pid /* it's open already */
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&& (sd->pid != p->p_pid)) { /* and not by us, */
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splx(s);
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return EBUSY; /* one at a time, please */
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}
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sd->pid = p->p_pid; /* and say who we are (do we need this? XXX) */
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splx(s);
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return 0;
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}
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case VINUM_DRIVE_TYPE:
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default:
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return ENODEV; /* don't know what to do with these */
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case VINUM_SUPERDEV_TYPE:
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if (p->p_ucred->cr_uid == 0) { /* root calling, */
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vinum_conf.opencount++; /* one more opener */
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return 0; /* no worries opening super dev */
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} else
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return EPERM; /* you can't do that! */
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}
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}
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/* ARGSUSED */
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int
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vinumclose(dev_t dev,
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int flags,
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int fmt,
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struct proc *p)
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{
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BROKEN_GDB;
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unsigned int index;
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struct volume *vol;
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struct plex *plex;
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struct sd *sd;
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struct devcode *device = (struct devcode *) &dev;
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index = VOLNO(dev);
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/* First, decide what we're looking at */
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switch (device->type) {
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case VINUM_VOLUME_TYPE:
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if (index >= vinum_conf.volumes_used)
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return ENXIO; /* no such device */
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vol = &VOL[index];
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switch (vol->state) {
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case volume_unallocated:
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case volume_uninit:
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return ENXIO;
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case volume_up:
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vol->opencount = 0; /* reset our flags */
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vol->pid = NULL; /* and forget who owned us */
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return 0;
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case volume_down:
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return EIO;
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default:
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return EINVAL;
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}
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case VINUM_PLEX_TYPE:
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if (VOLNO(dev) >= vinum_conf.volumes_used)
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return ENXIO;
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index = PLEXNO(dev); /* get plex index in vinum_conf */
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if (index >= vinum_conf.plexes_used)
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return ENXIO; /* no such device */
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plex = &PLEX[index];
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plex->pid = 0;
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return 0;
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case VINUM_SD_TYPE:
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if ((VOLNO(dev) >= vinum_conf.volumes_used) || /* no such volume */
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(PLEXNO(dev) >= vinum_conf.plexes_used)) /* or no such plex */
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return ENXIO; /* no such device */
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index = SDNO(dev); /* get the subdisk number */
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if (index >= vinum_conf.subdisks_used)
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return ENXIO; /* no such device */
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sd = &SD[index];
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sd->pid = 0;
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return 0;
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case VINUM_SUPERDEV_TYPE:
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if (p->p_ucred->cr_uid == 0) /* root calling, */
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vinum_conf.opencount--; /* one less opener */
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return 0; /* no worries closing super dev */
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case VINUM_DRIVE_TYPE:
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default:
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return ENODEV; /* don't know what to do with these */
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}
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}
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/* size routine */
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int
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vinumsize(dev_t dev)
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{
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BROKEN_GDB;
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struct volume *vol;
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int size;
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/* XXX This is bogus. We don't need to open
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* a device to find its size */
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vol = &VOL[VOLNO(dev)];
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if (vol->state == volume_up)
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size = vol->size;
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else
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return 0; /* err on the size of conservatism */
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return size;
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}
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int
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vinumdump(dev_t dev)
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{
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/* Not implemented. */
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return ENXIO;
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}
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