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NetBSD/sys/dev/vinum/vinumstate.c
grog d88f6bbaeb Initial import of Vinum kernel module. 
Ported by:  Ramsubramanyam <Ramsubramanyam@infosys.com>,
	    Atul Kabra <Atul_Kabra@infosys.com>,
	    Maneesh Jhinger <maneesh_jhinger@infosys.com>

Reviewed by:  lukem
2003-10-10 03:07:27 +00:00

1094 lines
33 KiB
C
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/*-
* Copyright (c) 1997, 1998, 1999
* Nan Yang Computer Services Limited. All rights reserved.
*
* Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project.
*
* 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: vinumstate.c,v 1.1.1.1 2003/10/10 03:09:32 grog Exp $
* $FreeBSD$
*/
#include <dev/vinum/vinumhdr.h>
#include <dev/vinum/request.h>
/* Update drive state */
/* Return 1 if the state changes, otherwise 0 */
int
set_drive_state(int driveno, enum drivestate newstate, enum setstateflags flags)
{
struct drive *drive = &DRIVE[driveno];
int oldstate = drive->state;
int sdno;
if (drive->state == drive_unallocated) /* no drive to do anything with, */
return 0;
if (newstate == oldstate) /* don't change it if it's not different */
return 1; /* all OK */
if ((newstate == drive_down) /* the drive's going down */
&&(!(flags & setstate_force))
&& (drive->opencount != 0)) /* we can't do it */
return 0; /* don't do it */
drive->state = newstate; /* set the state */
if (drive->label.name[0] != '\0') /* we have a name, */
log(LOG_INFO,
"vinum: drive %s is %s\n",
drive->label.name,
drive_state(drive->state));
if (drive->state != oldstate) { /* state has changed */
for (sdno = 0; sdno < vinum_conf.subdisks_allocated; sdno++) { /* find this drive's subdisks */
if ((SD[sdno].state >= sd_referenced)
&& (SD[sdno].driveno == driveno)) /* belongs to this drive */
update_sd_state(sdno); /* update the state */
}
}
if (newstate == drive_up) { /* want to bring it up */
if ((drive->flags & VF_OPEN) == 0) /* should be open, but we're not */
init_drive(drive, 1); /* which changes the state again */
} else /* taking it down or worse */
queue_daemon_request(daemonrq_closedrive, /* get the daemon to close it */
(union daemoninfo) drive);
if ((flags & setstate_configuring) == 0) /* configuring? */
save_config(); /* no: save the updated configuration now */
return 1;
}
/*
* Try to set the subdisk state. Return 1 if
* state changed to what we wanted, -1 if it
* changed to something else, and 0 if no change.
*
* This routine is called both from the user (up,
* down states only) and internally.
*
* The setstate_force bit in the flags enables the
* state change even if it could be dangerous to
* data consistency. It shouldn't allow nonsense.
*/
int
set_sd_state(int sdno, enum sdstate newstate, enum setstateflags flags)
{
struct sd *sd = &SD[sdno];
struct plex *plex;
struct volume *vol;
int oldstate = sd->state;
int status = 1; /* status to return */
if (newstate == oldstate) /* already there, */
return 1;
else if (sd->state == sd_unallocated) /* no subdisk to do anything with, */
return 0; /* can't do it */
if (sd->driveoffset < 0) { /* not allocated space */
sd->state = sd_down;
if (newstate != sd_down) {
if (sd->plexno >= 0)
sdstatemap(&PLEX[sd->plexno]); /* count up subdisks */
return -1;
}
} else { /* space allocated */
switch (newstate) {
case sd_down: /* take it down? */
/*
* If we're attached to a plex, and we're
* not reborn, we won't go down without
* use of force.
*/
if ((!flags & setstate_force)
&& (sd->plexno >= 0)
&& (sd->state != sd_reborn))
return 0; /* don't do it */
break;
case sd_initialized:
if ((sd->state == sd_initializing) /* we were initializing */
||(flags & setstate_force)) /* or we forced it */
break;
return 0; /* can't do it otherwise */
case sd_up:
if (DRIVE[sd->driveno].state != drive_up) /* can't bring the sd up if the drive isn't, */
return 0; /* not even by force */
if (flags & setstate_force) /* forcing it, */
break; /* just do it, and damn the consequences */
switch (sd->state) {
/*
* Perform the necessary tests. To allow
* the state transition, just break out of
* the switch.
*/
case sd_crashed:
case sd_reborn:
case sd_down: /* been down, no data lost */
/*
* If we're associated with a plex, and
* the plex isn't up, or we're the only
* subdisk in the plex, we can do it.
*/
if ((sd->plexno >= 0)
&& (((PLEX[sd->plexno].state < plex_firstup)
|| (PLEX[sd->plexno].subdisks > 1))))
break; /* do it */
if (oldstate != sd_reborn) {
sd->state = sd_reborn; /* here it is again */
log(LOG_INFO,
"vinum: %s is %s, not %s\n",
sd->name,
sd_state(sd->state),
sd_state(newstate));
}
status = -1;
break;
case sd_init: /* brand new */
if (flags & setstate_configuring) /* we're doing this while configuring */
break;
/* otherwise it's like being empty */
/* FALLTHROUGH */
case sd_empty:
case sd_initialized:
/*
* If we're not part of a plex, or the
* plex is not part of a volume with other
* plexes which are up, we can come up
* without being inconsistent.
*
* If we're part of a parity plex, we'll
* come up if the caller uses force. This
* is the way we bring them up after
* initialization.
*/
if ((sd->plexno < 0)
|| ((vpstate(&PLEX[sd->plexno]) & volplex_otherup) == 0)
|| (isparity((&PLEX[sd->plexno]))
&& (flags & setstate_force)))
break;
/* Otherwise it's just out of date */
/* FALLTHROUGH */
case sd_stale: /* out of date info, need reviving */
case sd_obsolete:
/*
* 1. If the subdisk is not part of a
* plex, bring it up, don't revive.
*
* 2. If the subdisk is part of a
* one-plex volume or an unattached
* plex, and it's not RAID-4 or
* RAID-5, we *can't revive*. The
* subdisk doesn't change its state.
*
* 3. If the subdisk is part of a
* one-plex volume or an unattached
* plex, and it's RAID-4 or RAID-5,
* but more than one subdisk is down,
* we *still can't revive*. The
* subdisk doesn't change its state.
*
* 4. If the subdisk is part of a
* multi-plex volume, we'll change to
* reviving and let the revive
* routines find out whether it will
* work or not. If they don't, the
* revive stops with an error message,
* but the state doesn't change
* (FWIW).
*/
if (sd->plexno < 0) /* no plex associated, */
break; /* bring it up */
plex = &PLEX[sd->plexno];
if (plex->volno >= 0) /* have a volume */
vol = &VOL[plex->volno];
else
vol = NULL;
/*
* We can't do it if:
*
* 1: we don't have a volume
* 2: we're the only plex in the volume
* 3: we're a RAID-4 or RAID-5 plex, and
* more than one subdisk is down.
*/
if (((vol == NULL)
|| (vol->plexes == 1))
&& ((!isparity(plex))
|| (plex->sddowncount > 1))) {
if (sd->state == sd_initializing) /* it's finished initializing */
sd->state = sd_initialized;
else
return 0; /* can't do it */
} else {
sd->state = sd_reviving; /* put in reviving state */
sd->revived = 0; /* nothing done yet */
status = EAGAIN; /* need to repeat */
}
break;
case sd_reviving:
if (flags & setstate_force) /* insist, */
break;
return EAGAIN; /* no, try again */
default: /* can't do it */
/*
* There's no way to bring subdisks up directly from
* other states. First they need to be initialized
* or revived.
*/
return 0;
}
break;
default: /* other ones, only internal with force */
if ((flags & setstate_force) == 0) /* no force? What's this? */
return 0; /* don't do it */
}
}
if (status == 1) { /* we can do it, */
sd->state = newstate;
if (flags & setstate_force)
log(LOG_INFO, "vinum: %s is %s by force\n", sd->name, sd_state(sd->state));
else
log(LOG_INFO, "vinum: %s is %s\n", sd->name, sd_state(sd->state));
} else /* we don't get here with status 0 */
log(LOG_INFO,
"vinum: %s is %s, not %s\n",
sd->name,
sd_state(sd->state),
sd_state(newstate));
if (sd->plexno >= 0) /* we belong to a plex */
update_plex_state(sd->plexno); /* update plex state */
if ((flags & setstate_configuring) == 0) /* save config now */
save_config();
return status;
}
/*
* Set the state of a plex dependent on its subdisks.
* This time round, we'll let plex state just reflect
* aggregate subdisk state, so this becomes an order of
* magnitude less complicated. In particular, ignore
* the requested state.
*/
int
set_plex_state(int plexno, enum plexstate state, enum setstateflags flags)
{
struct plex *plex; /* point to our plex */
enum plexstate oldstate;
enum volplexstate vps; /* how do we compare with the other plexes? */
plex = &PLEX[plexno]; /* point to our plex */
oldstate = plex->state;
/* If the plex isn't allocated, we can't do it. */
if (plex->state == plex_unallocated)
return 0;
/*
* If it's already in the the state we want,
* and it's not up, just return. If it's up,
* we still need to do some housekeeping.
*/
if ((state == oldstate)
&& (state != plex_up))
return 1;
vps = vpstate(plex); /* how do we compare with the other plexes? */
switch (state) {
/*
* We can't bring the plex up, even by force,
* unless it's ready. update_plex_state
* checks that.
*/
case plex_up: /* bring the plex up */
update_plex_state(plex->plexno); /* it'll come up if it can */
break;
case plex_down: /* want to take it down */
/*
* If we're the only one, or the only one
* which is up, we need force to do it.
*/
if (((vps == volplex_onlyus)
|| (vps == volplex_onlyusup))
&& (!(flags & setstate_force)))
return 0; /* can't do it */
plex->state = state; /* do it */
invalidate_subdisks(plex, sd_down); /* and down all up subdisks */
break;
/*
* This is only requested internally.
* Trust ourselves
*/
case plex_faulty:
plex->state = state; /* do it */
invalidate_subdisks(plex, sd_crashed); /* and crash all up subdisks */
break;
case plex_initializing:
/* XXX consider what safeguards we need here */
if ((flags & setstate_force) == 0)
return 0;
plex->state = state; /* do it */
break;
/* What's this? */
default:
return 0;
}
if (plex->state != oldstate) /* we've changed, */
log(LOG_INFO, /* tell them about it */
"vinum: %s is %s\n",
plex->name,
plex_state(plex->state));
/*
* Now see what we have left, and whether
* we're taking the volume down
*/
if (plex->volno >= 0) /* we have a volume */
update_volume_state(plex->volno); /* update its state */
if ((flags & setstate_configuring) == 0) /* save config now */
save_config(); /* yes: save the updated configuration */
return 1;
}
/* Update the state of a plex dependent on its plexes. */
int
set_volume_state(int volno, enum volumestate state, enum setstateflags flags)
{
struct volume *vol = &VOL[volno]; /* point to our volume */
if (vol->state == volume_unallocated) /* no volume to do anything with, */
return 0;
if (vol->state == state) /* we're there already */
return 1;
if (state == volume_up) /* want to come up */
update_volume_state(volno);
else if (state == volume_down) { /* want to go down */
if (((vol->flags & VF_OPEN) == 0) /* not open */
||((flags & setstate_force) != 0)) { /* or we're forcing */
vol->state = volume_down;
log(LOG_INFO,
"vinum: volume %s is %s\n",
vol->name,
volume_state(vol->state));
if ((flags & setstate_configuring) == 0) /* save config now */
save_config(); /* yes: save the updated configuration */
return 1;
}
}
return 0; /* no change */
}
/* Set the state of a subdisk based on its environment */
void
update_sd_state(int sdno)
{
struct sd *sd;
struct drive *drive;
enum sdstate oldstate;
sd = &SD[sdno];
oldstate = sd->state;
drive = &DRIVE[sd->driveno];
if (drive->state == drive_up) {
switch (sd->state) {
case sd_down:
case sd_crashed:
sd->state = sd_reborn; /* back up again with no loss */
break;
default:
break;
}
} else { /* down or worse */
switch (sd->state) {
case sd_up:
case sd_reborn:
case sd_reviving:
case sd_empty:
sd->state = sd_crashed; /* lost our drive */
break;
default:
break;
}
}
if (sd->state != oldstate) /* state has changed, */
log(LOG_INFO, /* say so */
"vinum: %s is %s\n",
sd->name,
sd_state(sd->state));
if (sd->plexno >= 0) /* we're part of a plex, */
update_plex_state(sd->plexno); /* update its state */
}
/*
* Force a plex and all its subdisks
* into an 'up' state. This is a helper
* for update_plex_state.
*/
void
forceup(int plexno)
{
struct plex *plex;
int sdno;
plex = &PLEX[plexno]; /* point to the plex */
plex->state = plex_up; /* and bring it up */
/* change the subdisks to up state */
for (sdno = 0; sdno < plex->subdisks; sdno++) {
SD[plex->sdnos[sdno]].state = sd_up;
log(LOG_INFO, /* tell them about it */
"vinum: %s is up\n",
SD[plex->sdnos[sdno]].name);
}
}
/* Set the state of a plex based on its environment */
void
update_plex_state(int plexno)
{
struct plex *plex; /* point to our plex */
enum plexstate oldstate;
enum sdstates statemap; /* get a map of the subdisk states */
enum volplexstate vps; /* how do we compare with the other plexes? */
plex = &PLEX[plexno]; /* point to our plex */
oldstate = plex->state;
statemap = sdstatemap(plex); /* get a map of the subdisk states */
vps = vpstate(plex); /* how do we compare with the other plexes? */
if (statemap & sd_initstate) /* something initializing? */
plex->state = plex_initializing; /* yup, that makes the plex the same */
else if (statemap == sd_upstate)
/*
* All the subdisks are up. This also means that
* they are consistent, so we can just bring
* the plex up
*/
plex->state = plex_up;
else if (isparity(plex) /* RAID-4 or RAID-5 plex */
&&(plex->sddowncount == 1)) /* and exactly one subdisk down */
plex->state = plex_degraded; /* limping a bit */
else if (((statemap & ~sd_downstate) == sd_emptystate) /* all subdisks empty */
||((statemap & ~sd_downstate)
== (statemap & ~sd_downstate & (sd_initializedstate | sd_upstate)))) {
if ((vps & volplex_otherup) == 0) { /* no other plex is up */
struct volume *vol = &VOL[plex->volno]; /* possible volume to which it points */
/*
* If we're a striped or concat plex
* associated with a volume, none of whose
* plexes are up, and we're new and untested,
* and the volume has the setupstate bit set,
* we can pretend to be in a consistent state.
*
* We need to do this in one swell foop: on
* the next call we will no longer be just
* empty.
*
* This code assumes that all the other plexes
* are also capable of coming up (i.e. all the
* sds are up), but that's OK: we'll come back
* to this function for the remaining plexes
* in the volume.
*/
if ((plex->state == plex_init)
&& (plex->volno >= 0)
&& (vol->flags & VF_CONFIG_SETUPSTATE)) {
for (plexno = 0; plexno < vol->plexes; plexno++)
forceup(VOL[plex->volno].plex[plexno]);
} else if ((statemap == sd_initializedstate) /* if it's initialized (not empty) */
||(plex->organization == plex_concat) /* and we're not RAID-4 or RAID-5 */
||(plex->organization == plex_striped))
forceup(plexno); /* we'll do it */
/*
* This leaves a case where things don't get
* done: the plex is RAID-4 or RAID-5, and
* the subdisks are all empty. They need to
* be initialized first.
*/
} else {
if (statemap == sd_upstate) /* all subdisks up */
plex->state = plex_up; /* we can come up too */
else
plex->state = plex_faulty;
}
} else if ((statemap & (sd_upstate | sd_rebornstate)) == statemap) /* all up or reborn */
plex->state = plex_flaky;
else if (statemap & (sd_upstate | sd_rebornstate)) /* some up or reborn */
plex->state = plex_corrupt; /* corrupt */
else if (statemap & (sd_initstate | sd_emptystate)) /* some subdisks empty or initializing */
plex->state = plex_initializing;
else /* nothing at all up */
plex->state = plex_faulty;
if (plex->state != oldstate) /* state has changed, */
log(LOG_INFO, /* tell them about it */
"vinum: %s is %s\n",
plex->name,
plex_state(plex->state));
if (plex->volno >= 0) /* we're part of a volume, */
update_volume_state(plex->volno); /* update its state */
}
/* Set volume state based on its components */
void
update_volume_state(int volno)
{
struct volume *vol; /* our volume */
int plexno;
enum volumestate oldstate;
vol = &VOL[volno]; /* point to our volume */
oldstate = vol->state;
for (plexno = 0; plexno < vol->plexes; plexno++) {
struct plex *plex = &PLEX[vol->plex[plexno]]; /* point to the plex */
if (plex->state >= plex_corrupt) { /* something accessible, */
vol->state = volume_up;
break;
}
}
if (plexno == vol->plexes) /* didn't find an up plex */
vol->state = volume_down;
if (vol->state != oldstate) { /* state changed */
log(LOG_INFO, "vinum: %s is %s\n", vol->name, volume_state(vol->state));
save_config(); /* save the updated configuration */
}
}
/*
* Called from request routines when they find
* a subdisk which is not kosher. Decide whether
* it warrants changing the state. Return
* REQUEST_DOWN if we can't use the subdisk,
* REQUEST_OK if we can.
*/
/*
* A prior version of this function checked the plex
* state as well. At the moment, consider plex states
* information for the user only. We'll ignore them
* and use the subdisk state only. The last version of
* this file with the old logic was 2.7. XXX
*/
enum requeststatus
checksdstate(struct sd *sd, struct request *rq, daddr_t diskaddr, daddr_t diskend)
{
struct plex *plex = &PLEX[sd->plexno];
int writeop = (rq->bp->b_flags & B_READ) == 0; /* note if we're writing */
switch (sd->state) {
/* We shouldn't get called if the subdisk is up */
case sd_up:
return REQUEST_OK;
case sd_reviving:
/*
* Access to a reviving subdisk depends on the
* organization of the plex:
*
* - If it's concatenated, access the subdisk
* up to its current revive point. If we
* want to write to the subdisk overlapping
* the current revive block, set the
* conflict flag in the request, asking the
* caller to put the request on the wait
* list, which will be attended to by
* revive_block when it's done.
* - if it's striped, we can't do it (we could
* do some hairy calculations, but it's
* unlikely to work).
* - if it's RAID-4 or RAID-5, we can do it as
* long as only one subdisk is down
*/
if (plex->organization == plex_striped) /* plex is striped, */
return REQUEST_DOWN;
else if (isparity(plex)) { /* RAID-4 or RAID-5 plex */
if (plex->sddowncount > 1) /* with more than one sd down, */
return REQUEST_DOWN;
else
/*
* XXX We shouldn't do this if we can find a
* better way. Check the other plexes
* first, and return a DOWN if another
* plex will do it better
*/
return REQUEST_OK; /* OK, we'll find a way */
}
if (diskaddr > (sd->revived
+ sd->plexoffset
+ (sd->revive_blocksize >> DEV_BSHIFT))) /* we're beyond the end */
return REQUEST_DOWN;
else if (diskend > (sd->revived + sd->plexoffset)) { /* we finish beyond the end */
if (writeop) {
rq->flags |= XFR_REVIVECONFLICT; /* note a potential conflict */
rq->sdno = sd->sdno; /* and which sd last caused it */
} else
return REQUEST_DOWN;
}
return REQUEST_OK;
case sd_reborn:
if (writeop)
return REQUEST_OK; /* always write to a reborn disk */
else /* don't allow a read */
/*
* Handle the mapping. We don't want to reject
* a read request to a reborn subdisk if that's
* all we have. XXX
*/
return REQUEST_DOWN;
case sd_down:
if (writeop) /* writing to a consistent down disk */
set_sd_state(sd->sdno, sd_obsolete, setstate_force); /* it's not consistent now */
return REQUEST_DOWN;
case sd_crashed:
if (writeop) /* writing to a consistent down disk */
set_sd_state(sd->sdno, sd_stale, setstate_force); /* it's not consistent now */
return REQUEST_DOWN;
default:
return REQUEST_DOWN;
}
}
/* return a state map for the subdisks of a plex */
enum sdstates
sdstatemap(struct plex *plex)
{
int sdno;
enum sdstates statemap = 0; /* note the states we find */
plex->sddowncount = 0; /* no subdisks down yet */
for (sdno = 0; sdno < plex->subdisks; sdno++) {
struct sd *sd = &SD[plex->sdnos[sdno]]; /* point to the subdisk */
switch (sd->state) {
case sd_empty:
statemap |= sd_emptystate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_init:
statemap |= sd_initstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_down:
statemap |= sd_downstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_crashed:
statemap |= sd_crashedstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_obsolete:
statemap |= sd_obsoletestate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_stale:
statemap |= sd_stalestate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_reborn:
statemap |= sd_rebornstate;
break;
case sd_up:
statemap |= sd_upstate;
break;
case sd_initializing:
statemap |= sd_initstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_initialized:
statemap |= sd_initializedstate;
(plex->sddowncount)++; /* another unusable subdisk */
break;
case sd_unallocated:
case sd_uninit:
case sd_reviving:
case sd_referenced:
statemap |= sd_otherstate;
(plex->sddowncount)++; /* another unusable subdisk */
}
}
return statemap;
}
/* determine the state of the volume relative to this plex */
enum volplexstate
vpstate(struct plex *plex)
{
struct volume *vol;
enum volplexstate state = volplex_onlyusdown; /* state to return */
int plexno;
if (plex->volno < 0) { /* not associated with a volume */
if (plex->state > plex_degraded)
return volplex_onlyus; /* just us */
else
return volplex_onlyusdown; /* assume the worst */
}
vol = &VOL[plex->volno]; /* point to our volume */
for (plexno = 0; plexno < vol->plexes; plexno++) {
if (&PLEX[vol->plex[plexno]] == plex) { /* us */
if (PLEX[vol->plex[plexno]].state >= plex_degraded) /* are we up? */
state |= volplex_onlyus; /* yes */
} else {
if (PLEX[vol->plex[plexno]].state >= plex_degraded) /* not us */
state |= volplex_otherup; /* and when they were up, they were up */
else
state |= volplex_alldown; /* and when they were down, they were down */
}
}
return state; /* and when they were only halfway up */
} /* they were neither up nor down */
/* Check if all bits b are set in a */
int allset(int a, int b);
int
allset(int a, int b)
{
return (a & b) == b;
}
/* Invalidate the subdisks belonging to a plex */
void
invalidate_subdisks(struct plex *plex, enum sdstate state)
{
int sdno;
for (sdno = 0; sdno < plex->subdisks; sdno++) { /* for each subdisk */
struct sd *sd = &SD[plex->sdnos[sdno]];
switch (sd->state) {
case sd_unallocated:
case sd_uninit:
case sd_init:
case sd_initializing:
case sd_initialized:
case sd_empty:
case sd_obsolete:
case sd_stale:
case sd_crashed:
case sd_down:
case sd_referenced:
break;
case sd_reviving:
case sd_reborn:
case sd_up:
set_sd_state(plex->sdnos[sdno], state, setstate_force);
}
}
}
/*
* Start an object, in other words do what we can to get it up.
* This is called from vinumioctl (VINUMSTART).
* Return error indications via ioctl_reply
*/
void
start_object(struct vinum_ioctl_msg *data)
{
int status;
int objindex = data->index; /* data gets overwritten */
struct _ioctl_reply *ioctl_reply = (struct _ioctl_reply *) data; /* format for returning replies */
enum setstateflags flags;
if (data->force != 0) /* are we going to use force? */
flags = setstate_force; /* yes */
else
flags = setstate_none; /* no */
switch (data->type) {
case drive_object:
status = set_drive_state(objindex, drive_up, flags);
if (DRIVE[objindex].state != drive_up) /* set status on whether we really did it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
break;
case sd_object:
if (DRIVE[SD[objindex].driveno].state != drive_up) {
ioctl_reply->error = EIO;
strcpy(ioctl_reply->msg, "Drive is down");
return;
}
if (data->blocksize)
SD[objindex].revive_blocksize = data->blocksize;
if ((SD[objindex].state == sd_reviving) /* reviving, */
||(SD[objindex].state == sd_stale)) { /* or stale, will revive */
SD[objindex].state = sd_reviving; /* make sure we're reviving */
ioctl_reply->error = revive_block(objindex); /* revive another block */
ioctl_reply->msg[0] = '\0'; /* no comment */
return;
} else if (SD[objindex].state == sd_initializing) { /* initializing, */
if (data->blocksize)
SD[objindex].init_blocksize = data->blocksize;
ioctl_reply->error = initsd(objindex, data->verify); /* initialize another block */
ioctl_reply->msg[0] = '\0'; /* no comment */
return;
}
status = set_sd_state(objindex, sd_up, flags); /* set state */
if (status != EAGAIN) { /* not first revive or initialize, */
if (SD[objindex].state != sd_up) /* set status on whether we really did it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
} else
ioctl_reply->error = status;
break;
case plex_object:
status = set_plex_state(objindex, plex_up, flags);
if (PLEX[objindex].state != plex_up) /* set status on whether we really did it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
break;
case volume_object:
status = set_volume_state(objindex, volume_up, flags);
if (VOL[objindex].state != volume_up) /* set status on whether we really did it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
break;
default:
ioctl_reply->error = EINVAL;
strcpy(ioctl_reply->msg, "Invalid object type");
return;
}
/*
* There's no point in saying anything here:
* the userland program does it better
*/
ioctl_reply->msg[0] = '\0';
}
/*
* Stop an object, in other words do what we can to get it down
* This is called from vinumioctl (VINUMSTOP).
* Return error indications via ioctl_reply.
*/
void
stop_object(struct vinum_ioctl_msg *data)
{
int status = 1;
int objindex = data->index; /* save the number from change */
struct _ioctl_reply *ioctl_reply = (struct _ioctl_reply *) data; /* format for returning replies */
switch (data->type) {
case drive_object:
status = set_drive_state(objindex, drive_down, data->force);
break;
case sd_object:
status = set_sd_state(objindex, sd_down, data->force);
break;
case plex_object:
status = set_plex_state(objindex, plex_down, data->force);
break;
case volume_object:
status = set_volume_state(objindex, volume_down, data->force);
break;
default:
ioctl_reply->error = EINVAL;
strcpy(ioctl_reply->msg, "Invalid object type");
return;
}
ioctl_reply->msg[0] = '\0';
if (status == 0) /* couldn't do it */
ioctl_reply->error = EBUSY;
else
ioctl_reply->error = 0;
}
/*
* VINUM_SETSTATE ioctl: set an object state.
* msg is the message passed by the user.
*/
void
setstate(struct vinum_ioctl_msg *msg)
{
int sdno;
struct sd *sd;
struct plex *plex;
struct _ioctl_reply *ioctl_reply = (struct _ioctl_reply *) msg; /* format for returning replies */
switch (msg->state) {
case object_down:
stop_object(msg);
break;
case object_initializing:
switch (msg->type) {
case sd_object:
sd = &SD[msg->index];
if ((msg->index >= vinum_conf.subdisks_allocated)
|| (sd->state <= sd_referenced)) {
sprintf(ioctl_reply->msg, "Invalid subdisk %d", msg->index);
ioctl_reply->error = EFAULT;
return;
}
set_sd_state(msg->index, sd_initializing, msg->force);
if (sd->state != sd_initializing) {
strcpy(ioctl_reply->msg, "Can't set state");
ioctl_reply->error = EBUSY;
} else
ioctl_reply->error = 0;
break;
case plex_object:
plex = &PLEX[msg->index];
if ((msg->index >= vinum_conf.plexes_allocated)
|| (plex->state <= plex_unallocated)) {
sprintf(ioctl_reply->msg, "Invalid plex %d", msg->index);
ioctl_reply->error = EFAULT;
return;
}
set_plex_state(msg->index, plex_initializing, msg->force);
if (plex->state != plex_initializing) {
strcpy(ioctl_reply->msg, "Can't set state");
ioctl_reply->error = EBUSY;
} else {
ioctl_reply->error = 0;
for (sdno = 0; sdno < plex->subdisks; sdno++) {
sd = &SD[plex->sdnos[sdno]];
set_sd_state(plex->sdnos[sdno], sd_initializing, msg->force);
if (sd->state != sd_initializing) {
strcpy(ioctl_reply->msg, "Can't set state");
ioctl_reply->error = EBUSY;
break;
}
}
}
break;
default:
strcpy(ioctl_reply->msg, "Invalid object");
ioctl_reply->error = EINVAL;
}
break;
case object_initialized:
if (msg->type == sd_object) {
sd = &SD[msg->index];
if ((msg->index >= vinum_conf.subdisks_allocated)
|| (sd->state <= sd_referenced)) {
sprintf(ioctl_reply->msg, "Invalid subdisk %d", msg->index);
ioctl_reply->error = EFAULT;
return;
}
set_sd_state(msg->index, sd_initialized, msg->force);
if (sd->state != sd_initializing) {
strcpy(ioctl_reply->msg, "Can't set state");
ioctl_reply->error = EBUSY;
} else
ioctl_reply->error = 0;
} else {
strcpy(ioctl_reply->msg, "Invalid object");
ioctl_reply->error = EINVAL;
}
break;
case object_up:
start_object(msg);
}
}
/*
* Brute force set state function. Don't look at
* any dependencies, just do it. This is mainly
* intended for testing and recovery.
*/
void
setstate_by_force(struct vinum_ioctl_msg *msg)
{
struct _ioctl_reply *ioctl_reply = (struct _ioctl_reply *) msg; /* format for returning replies */
switch (msg->type) {
case drive_object:
DRIVE[msg->index].state = msg->state;
break;
case sd_object:
SD[msg->index].state = msg->state;
break;
case plex_object:
PLEX[msg->index].state = msg->state;
break;
case volume_object:
VOL[msg->index].state = msg->state;
break;
default:
break;
}
ioctl_reply->error = 0;
}
/* Local Variables: */
/* fill-column: 50 */
/* End: */
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