fd9cb11e53
a quick think and discussion among various people some form of some of these changes will probably be recommitted. The reversion requested was requested by dg while discussions proceed. PHK has indicated that he can live with this, and it has been agreed that some form of some of these changes may return shortly after further discussion.
475 lines
14 KiB
C
475 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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* Written by Greg Lehey
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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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* $FreeBSD$
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*/
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#define STATIC static /* nothing while we're testing XXX */
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#include <dev/vinum/vinumhdr.h>
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#include <sys/sysproto.h> /* for sync(2) */
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#ifdef VINUMDEBUG
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#include <sys/reboot.h>
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int debug = 0;
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extern int total_malloced;
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extern int malloccount;
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extern struct mc malloced[];
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#endif
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#include <dev/vinum/request.h>
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STATIC struct cdevsw vinum_cdevsw =
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{
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vinumopen, vinumclose, physread, physwrite,
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vinumioctl, nostop, noreset, nodevtotty,
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seltrue, nommap, vinumstrategy, "vinum",
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noparms, CDEV_MAJOR, vinumdump, vinumsize,
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D_DISK, 0, BDEV_MAJOR
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};
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/* Called by main() during pseudo-device attachment. */
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STATIC void vinumattach(void *);
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#ifndef ACTUALLY_LKM_NOT_KERNEL
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STATIC int vinum_modevent(module_t mod, modeventtype_t type, void *unused);
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#endif
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struct _vinum_conf vinum_conf; /* configuration information */
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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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/* 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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log(LOG_INFO, "vinum: loaded\n");
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vinum_conf.flags |= VF_LOADED; /* we're loaded now */
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daemonq = NULL; /* initialize daemon's work queue */
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dqend = NULL;
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cdevsw_add(&vinum_cdevsw); /* add the cdevsw entry */
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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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bzero(DRIVE, sizeof(struct drive) * INITIAL_DRIVES);
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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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bzero(VOL, sizeof(struct volume) * INITIAL_VOLUMES);
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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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bzero(PLEX, sizeof(struct plex) * INITIAL_PLEXES);
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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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bzero(SD, sizeof(struct sd) * INITIAL_SUBDISKS);
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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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}
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/*
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* Check if we have anything open. If confopen is != 0,
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* that goes for the super device as well, otherwise
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* only for volumes.
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*
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* Return 0 if not inactive, 1 if inactive.
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*/
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int
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vinum_inactive(int confopen)
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{
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int i;
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int can_do = 1; /* assume we can do it */
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if (confopen && (vinum_conf.flags & VF_OPEN)) /* open by vinum(8)? */
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return 0; /* can't do it while we're open */
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lock_config();
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for (i = 0; i < vinum_conf.volumes_allocated; i++) {
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if ((VOL[i].state > volume_down)
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&& (VOL[i].flags & VF_OPEN)) { /* 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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/*
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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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int i;
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int drives_allocated = vinum_conf.drives_allocated;
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if (DRIVE != NULL) {
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if (cleardrive) { /* remove the vinum config */
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for (i = 0; i < drives_allocated; i++)
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remove_drive(i); /* remove the drive */
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} else { /* keep the config */
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for (i = 0; i < drives_allocated; i++)
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free_drive(&DRIVE[i]); /* close files and things */
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}
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Free(DRIVE);
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}
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while ((vinum_conf.flags & (VF_STOPPING | VF_DAEMONOPEN))
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== (VF_STOPPING | VF_DAEMONOPEN)) { /* at least one daemon open, we're stopping */
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queue_daemon_request(daemonrq_return, (union daemoninfo) NULL); /* stop the daemon */
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tsleep(&vinumclose, PUSER, "vstop", 1); /* and wait for it */
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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_allocated; 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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}
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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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STATIC int
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vinum_modevent(module_t mod, modeventtype_t type, void *unused)
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{
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struct sync_args dummyarg =
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{0};
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switch (type) {
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case MOD_LOAD:
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vinumattach(NULL);
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return 0; /* OK */
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case MOD_UNLOAD:
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if (!vinum_inactive(1)) /* is anything open? */
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return EBUSY; /* yes, we can't do it */
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vinum_conf.flags |= VF_STOPPING; /* note that we want to stop */
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sync(curproc, &dummyarg); /* write out buffers */
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free_vinum(0); /* clean up */
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#ifdef VINUMDEBUG
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if (total_malloced) {
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int i;
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#ifdef INVARIANTS
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int *poke;
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#endif
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for (i = 0; i < malloccount; i++) {
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if (debug & DEBUG_WARNINGS) /* want to hear about them */
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log(LOG_WARNING,
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"vinum: exiting with %d bytes malloced from %s:%d\n",
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malloced[i].size,
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malloced[i].file,
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malloced[i].line);
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#ifdef INVARIANTS
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poke = &((int *) malloced[i].address)
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[malloced[i].size / (2 * sizeof(int))]; /* middle of the area */
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if (*poke == 0xdeadc0de) /* already freed */
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log(LOG_ERR,
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"vinum: exiting with malloc table inconsistency at %p from %s:%d\n",
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malloced[i].address,
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malloced[i].file,
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malloced[i].line);
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#endif
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Free(malloced[i].address);
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}
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}
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#endif
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cdevsw_remove(&vinum_cdevsw);
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log(LOG_INFO, "vinum: unloaded\n"); /* tell the world */
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return 0;
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default:
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break;
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}
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return 0;
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}
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moduledata_t vinum_mod =
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{
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"vinum",
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(modeventhand_t) vinum_modevent,
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0
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};
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DECLARE_MODULE(vinum, vinum_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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/* ARGSUSED */
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/* Open a vinum object */
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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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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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int devminor; /* minor number */
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devminor = minor(dev);
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dev->si_bsize_phys = DEV_BSIZE;
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dev->si_bsize_best = VINUM_BSIZE_BEST; /* kludge until we track drive block sizes */
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dev->si_bsize_max = MAXBSIZE;
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error = 0;
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/* First, decide what we're looking at */
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switch (DEVTYPE(dev)) {
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case VINUM_VOLUME_TYPE:
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index = Volno(dev);
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if (index >= vinum_conf.volumes_allocated)
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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->flags |= VF_OPEN; /* note we're open */
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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_allocated)
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return ENXIO;
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/* FALLTHROUGH */
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case VINUM_RAWPLEX_TYPE:
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index = Plexno(dev); /* get plex index in vinum_conf */
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if (index >= vinum_conf.plexes_allocated)
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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_referenced:
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case plex_unallocated:
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return EINVAL;
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default:
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plex->flags |= VF_OPEN; /* note we're open */
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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_allocated) /* no such volume */
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||(Plexno(dev) >= vinum_conf.plexes_allocated)) /* or no such plex */
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return ENXIO; /* no such device */
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/* FALLTHROUGH */
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case VINUM_RAWSD_TYPE:
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index = Sdno(dev); /* get the subdisk number */
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if ((index >= vinum_conf.subdisks_allocated) /* not a valid SD entry */
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||(SD[index].state < sd_init)) /* or SD is not real */
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return ENXIO; /* no such device */
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sd = &SD[index];
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/*
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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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*/
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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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sd->flags |= VF_OPEN; /* note we're open */
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return 0;
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}
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case VINUM_SUPERDEV_TYPE:
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error = suser(p); /* are we root? */
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if (error == 0) { /* yes, can do */
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if (devminor == VINUM_DAEMON_DEV) /* daemon device */
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vinum_conf.flags |= VF_DAEMONOPEN; /* we're open */
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else if (devminor == VINUM_SUPERDEV)
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vinum_conf.flags |= VF_OPEN; /* we're open */
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else
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error = ENODEV; /* nothing, maybe a debug mismatch */
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}
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return error;
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/* Vinum drives are disks. We already have a disk
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* driver, so don't handle them here */
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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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/* 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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unsigned int index;
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struct volume *vol;
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int devminor;
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devminor = minor(dev);
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index = Volno(dev);
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/* First, decide what we're looking at */
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switch (DEVTYPE(dev)) {
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case VINUM_VOLUME_TYPE:
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if (index >= vinum_conf.volumes_allocated)
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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->flags &= ~VF_OPEN; /* reset our flags */
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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_allocated)
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return ENXIO;
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/* FALLTHROUGH */
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case VINUM_RAWPLEX_TYPE:
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index = Plexno(dev); /* get plex index in vinum_conf */
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if (index >= vinum_conf.plexes_allocated)
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return ENXIO; /* no such device */
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PLEX[index].flags &= ~VF_OPEN; /* reset our flags */
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return 0;
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case VINUM_SD_TYPE:
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if ((Volno(dev) >= vinum_conf.volumes_allocated) || /* no such volume */
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(Plexno(dev) >= vinum_conf.plexes_allocated)) /* or no such plex */
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return ENXIO; /* no such device */
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/* FALLTHROUGH */
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case VINUM_RAWSD_TYPE:
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index = Sdno(dev); /* get the subdisk number */
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if (index >= vinum_conf.subdisks_allocated)
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return ENXIO; /* no such device */
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SD[index].flags &= ~VF_OPEN; /* reset our flags */
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return 0;
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case VINUM_SUPERDEV_TYPE:
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/*
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* don't worry about whether we're root:
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* nobody else would get this far.
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*/
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if (devminor == VINUM_SUPERDEV) /* normal superdev */
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vinum_conf.flags &= ~VF_OPEN; /* no longer open */
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else if (devminor == VINUM_DAEMON_DEV) { /* the daemon device */
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vinum_conf.flags &= ~VF_DAEMONOPEN; /* no longer open */
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if (vinum_conf.flags & VF_STOPPING) /* we're stopping, */
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wakeup(&vinumclose); /* we can continue stopping now */
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}
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return 0;
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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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struct volume *vol;
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int 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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/* Local Variables: */
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/* fill-column: 50 */
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/* End: */
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