mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
b99c307a21
substitute BUF_WRITE(foo) for VOP_BWRITE(foo->b_vp, foo) substitute BUF_STRATEGY(foo) for VOP_STRATEGY(foo->b_vp, foo) This patch is machine generated except for the ccd.c and buf.h parts.
277 lines
9.0 KiB
C
277 lines
9.0 KiB
C
/* daemon.c: kernel part of Vinum daemon */
|
||
/*-
|
||
* Copyright (c) 1997, 1998
|
||
* Nan Yang Computer Services Limited. All rights reserved.
|
||
*
|
||
* This software is distributed under the so-called ``Berkeley
|
||
* License'':
|
||
*
|
||
* Redistribution and use in source and binary forms, with or without
|
||
* modification, are permitted provided that the following conditions
|
||
* are met:
|
||
* 1. Redistributions of source code must retain the above copyright
|
||
* notice, this list of conditions and the following disclaimer.
|
||
* 2. Redistributions in binary form must reproduce the above copyright
|
||
* notice, this list of conditions and the following disclaimer in the
|
||
* documentation and/or other materials provided with the distribution.
|
||
* 3. All advertising materials mentioning features or use of this software
|
||
* must display the following acknowledgement:
|
||
* This product includes software developed by Nan Yang Computer
|
||
* Services Limited.
|
||
* 4. Neither the name of the Company nor the names of its contributors
|
||
* may be used to endorse or promote products derived from this software
|
||
* without specific prior written permission.
|
||
*
|
||
* This software is provided ``as is'', and any express or implied
|
||
* warranties, including, but not limited to, the implied warranties of
|
||
* merchantability and fitness for a particular purpose are disclaimed.
|
||
* In no event shall the company or contributors be liable for any
|
||
* direct, indirect, incidental, special, exemplary, or consequential
|
||
* damages (including, but not limited to, procurement of substitute
|
||
* goods or services; loss of use, data, or profits; or business
|
||
* interruption) however caused and on any theory of liability, whether
|
||
* in contract, strict liability, or tort (including negligence or
|
||
* otherwise) arising in any way out of the use of this software, even if
|
||
* advised of the possibility of such damage.
|
||
*
|
||
* $Id: vinumdaemon.c,v 1.8 2000/01/03 05:22:03 grog Exp grog $
|
||
* $FreeBSD$
|
||
*/
|
||
|
||
#include <dev/vinum/vinumhdr.h>
|
||
#include <dev/vinum/request.h>
|
||
|
||
#ifdef VINUMDEBUG
|
||
#include <sys/reboot.h>
|
||
#endif
|
||
|
||
/* declarations */
|
||
void recover_io(struct request *rq);
|
||
|
||
int daemon_options = 0; /* options */
|
||
int daemonpid; /* PID of daemon */
|
||
struct daemonq *daemonq; /* daemon's work queue */
|
||
struct daemonq *dqend; /* and the end of the queue */
|
||
|
||
/*
|
||
* We normally call Malloc to get a queue element. In interrupt
|
||
* context, we can't guarantee that we'll get one, since we're not
|
||
* allowed to wait. If malloc fails, use one of these elements.
|
||
*/
|
||
|
||
#define INTQSIZE 4
|
||
struct daemonq intq[INTQSIZE]; /* queue elements for interrupt context */
|
||
struct daemonq *intqp; /* and pointer in it */
|
||
|
||
void
|
||
vinum_daemon(void)
|
||
{
|
||
int s;
|
||
struct daemonq *request;
|
||
|
||
curproc->p_flag |= P_INMEM | P_SYSTEM; /* we're a system process */
|
||
daemon_save_config(); /* start by saving the configuration */
|
||
daemonpid = curproc->p_pid; /* mark our territory */
|
||
while (1) {
|
||
tsleep(&vinum_daemon, PRIBIO, "vinum", 0); /* wait for something to happen */
|
||
|
||
/*
|
||
* It's conceivable that, as the result of an
|
||
* I/O error, we'll be out of action long
|
||
* enough that another daemon gets started.
|
||
* That's OK, just give up gracefully.
|
||
*/
|
||
if (curproc->p_pid != daemonpid) { /* we've been ousted in our sleep */
|
||
if (daemon_options & daemon_verbose)
|
||
log(LOG_INFO, "vinum: abdicating\n");
|
||
return;
|
||
}
|
||
while (daemonq != NULL) { /* we have work to do, */
|
||
s = splhigh(); /* don't get interrupted here */
|
||
request = daemonq; /* get the request */
|
||
daemonq = daemonq->next; /* and detach it */
|
||
if (daemonq == NULL) /* got to the end, */
|
||
dqend = NULL; /* no end any more */
|
||
splx(s);
|
||
|
||
switch (request->type) {
|
||
/*
|
||
* We had an I/O error on a request. Go through the
|
||
* request and try to salvage it
|
||
*/
|
||
case daemonrq_ioerror:
|
||
if (daemon_options & daemon_verbose) {
|
||
struct request *rq = request->info.rq;
|
||
|
||
log(LOG_WARNING,
|
||
"vinum: recovering I/O request: %p\n%s dev %d.%d, offset 0x%x, length %ld\n",
|
||
rq,
|
||
rq->bp->b_iocmd == BIO_READ ? "Read" : "Write",
|
||
major(rq->bp->b_dev),
|
||
minor(rq->bp->b_dev),
|
||
rq->bp->b_blkno,
|
||
rq->bp->b_bcount);
|
||
}
|
||
recover_io(request->info.rq); /* the failed request */
|
||
break;
|
||
|
||
/*
|
||
* Write the config to disk. We could end up with
|
||
* quite a few of these in a row. Only honour the
|
||
* last one
|
||
*/
|
||
case daemonrq_saveconfig:
|
||
if ((daemonq == NULL) /* no more requests */
|
||
||(daemonq->type != daemonrq_saveconfig)) { /* or the next isn't the same */
|
||
if (((daemon_options & daemon_noupdate) == 0) /* we're allowed to do it */
|
||
&&((vinum_conf.flags & VF_READING_CONFIG) == 0)) { /* and we're not building the config now */
|
||
/*
|
||
* We obviously don't want to save a
|
||
* partial configuration. Less obviously,
|
||
* we don't need to do anything if we're
|
||
* asked to write the config when we're
|
||
* building it up, because we save it at
|
||
* the end.
|
||
*/
|
||
if (daemon_options & daemon_verbose)
|
||
log(LOG_INFO, "vinum: saving config\n");
|
||
daemon_save_config(); /* save it */
|
||
}
|
||
}
|
||
break;
|
||
|
||
case daemonrq_return: /* been told to stop */
|
||
if (daemon_options & daemon_verbose)
|
||
log(LOG_INFO, "vinum: stopping\n");
|
||
daemon_options |= daemon_stopped; /* note that we've stopped */
|
||
Free(request);
|
||
while (daemonq != NULL) { /* backed up requests, */
|
||
request = daemonq; /* get the request */
|
||
daemonq = daemonq->next; /* and detach it */
|
||
Free(request); /* then free it */
|
||
}
|
||
wakeup(&vinumclose); /* and wake any waiting vinum(8)s */
|
||
return;
|
||
|
||
case daemonrq_ping: /* tell the caller we're here */
|
||
if (daemon_options & daemon_verbose)
|
||
log(LOG_INFO, "vinum: ping reply\n");
|
||
wakeup(&vinum_finddaemon); /* wake up the caller */
|
||
break;
|
||
|
||
case daemonrq_closedrive: /* close a drive */
|
||
close_drive(request->info.drive); /* do it */
|
||
break;
|
||
|
||
case daemonrq_init: /* initialize a plex */
|
||
/* XXX */
|
||
case daemonrq_revive: /* revive a subdisk */
|
||
/* XXX */
|
||
/* FALLTHROUGH */
|
||
default:
|
||
log(LOG_WARNING, "Invalid request\n");
|
||
break;
|
||
}
|
||
if (request->privateinuse) /* one of ours, */
|
||
request->privateinuse = 0; /* no longer in use */
|
||
else
|
||
Free(request); /* return it */
|
||
}
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Recover a failed I/O operation.
|
||
*
|
||
* The correct way to do this is to examine the request and determine
|
||
* how to recover each individual failure. In the case of a write,
|
||
* this could be as simple as doing nothing: the defective drives may
|
||
* already be down, and there may be nothing else to do. In case of
|
||
* a read, it will be necessary to retry if there are alternative
|
||
* copies of the data.
|
||
*
|
||
* The easy way (here) is just to reissue the request. This will take
|
||
* a little longer, but nothing like as long as the failure will have
|
||
* taken.
|
||
*
|
||
*/
|
||
void
|
||
recover_io(struct request *rq)
|
||
{
|
||
/*
|
||
* This should read:
|
||
*
|
||
* vinumstrategy(rq->bp);
|
||
*
|
||
* Negotiate with phk to get it fixed.
|
||
*/
|
||
DEV_STRATEGY(rq->bp, 0); /* reissue the command */
|
||
}
|
||
|
||
/* Functions called to interface with the daemon */
|
||
|
||
/* queue a request for the daemon */
|
||
void
|
||
queue_daemon_request(enum daemonrq type, union daemoninfo info)
|
||
{
|
||
int s;
|
||
|
||
struct daemonq *qelt = (struct daemonq *) Malloc(sizeof(struct daemonq));
|
||
|
||
if (qelt == NULL) { /* malloc failed, we're prepared for that */
|
||
/*
|
||
* Take one of our spares. Give up if it's still in use; the only
|
||
* message we're likely to get here is a 'drive failed' message,
|
||
* and that'll come by again if we miss it.
|
||
*/
|
||
if (intqp->privateinuse) /* still in use? */
|
||
return; /* yes, give up */
|
||
qelt = intqp++;
|
||
if (intqp == &intq[INTQSIZE]) /* got to the end, */
|
||
intqp = intq; /* wrap around */
|
||
qelt->privateinuse = 1; /* it's ours, and it's in use */
|
||
} else
|
||
qelt->privateinuse = 0;
|
||
|
||
qelt->next = NULL; /* end of the chain */
|
||
qelt->type = type;
|
||
qelt->info = info;
|
||
s = splhigh();
|
||
if (daemonq) { /* something queued already */
|
||
dqend->next = qelt;
|
||
dqend = qelt;
|
||
} else { /* queue is empty, */
|
||
daemonq = qelt; /* this is the whole queue */
|
||
dqend = qelt;
|
||
}
|
||
splx(s);
|
||
wakeup(&vinum_daemon); /* and give the d<>mon a kick */
|
||
}
|
||
|
||
/*
|
||
* see if the daemon is running. Return 0 (no error)
|
||
* if it is, ESRCH otherwise
|
||
*/
|
||
int
|
||
vinum_finddaemon()
|
||
{
|
||
int result;
|
||
|
||
if (daemonpid != 0) { /* we think we have a daemon, */
|
||
queue_daemon_request(daemonrq_ping, (union daemoninfo) NULL); /* queue a ping */
|
||
result = tsleep(&vinum_finddaemon, PUSER, "reap", 2 * hz);
|
||
if (result == 0) /* yup, the daemon's up and running */
|
||
return 0;
|
||
}
|
||
/* no daemon, or we couldn't talk to it: start it */
|
||
vinum_daemon(); /* start the daemon */
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
vinum_setdaemonopts(int options)
|
||
{
|
||
daemon_options = options;
|
||
return 0;
|
||
}
|