/*- * 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 #ifdef VINUMDEBUG #include int debug = 0; extern int total_malloced; extern int malloccount; extern struct mc malloced[]; #endif #include 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: */