/*
* 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;
}
/*
* Take a completed buffer, transfer the data back if
* it's a read, and complete the high-level request
* if this is the last subrequest.
*
* The bp parameter is in fact a struct rqelement, which
* includes a couple of extras at the end.
*/
void
complete_rqe(struct bio *bio)
{
union daemoninfo di;
struct buf *bp = bio->bio_buf;
struct rqelement *rqe;
struct request *rq;
struct rqgroup *rqg;
struct bio *ubio; /* user buffer */
struct drive *drive;
struct sd *sd;
char *gravity; /* for error messages */
get_mplock();
rqe = (struct rqelement *) bp; /* point to the element that completed */
rqg = rqe->rqg; /* and the request group */
rq = rqg->rq; /* and the complete request */
ubio = rq->bio; /* user buffer */
#ifdef VINUMDEBUG
if (debug & DEBUG_LASTREQS)
logrq(loginfo_iodone, (union rqinfou) rqe, ubio);
#endif
drive = &DRIVE[rqe->driveno];
drive->active--; /* one less outstanding I/O on this drive */
vinum_conf.active--; /* one less outstanding I/O globally */
if ((drive->active == (DRIVE_MAXACTIVE - 1)) /* we were at the drive limit */
||(vinum_conf.active == VINUM_MAXACTIVE)) /* or the global limit */
wakeup(&launch_requests); /* let another one at it */
if ((bp->b_flags & B_ERROR) != 0) { /* transfer in error */
gravity = "";
sd = &SD[rqe->sdno];
if (bp->b_error != 0) /* did it return a number? */
rq->error = bp->b_error; /* yes, put it in. */
else if (rq->error == 0) /* no: do we have one already? */
rq->error = EIO; /* no: catchall "I/O error" */
sd->lasterror = rq->error;
if (bp->b_cmd == BUF_CMD_READ) {
if ((rq->error == ENXIO) || (sd->flags & VF_RETRYERRORS) == 0) {
gravity = " fatal";
set_sd_state(rqe->sdno, sd_crashed, setstate_force); /* subdisk is crashed */
}
log(LOG_ERR,
"%s:%s read error, offset %lld for %d bytes\n",
gravity,
sd->name,
(long long)bio->bio_offset,
bp->b_bcount);
} else { /* write operation */
if ((rq->error == ENXIO) || (sd->flags & VF_RETRYERRORS) == 0) {
gravity = "fatal ";
set_sd_state(rqe->sdno, sd_stale, setstate_force); /* subdisk is stale */
}
log(LOG_ERR,
"%s:%s write error, offset %lld for %d bytes\n",
gravity,
sd->name,
(long long)bio->bio_offset,
bp->b_bcount);
}
log(LOG_ERR,
"%s: user buffer offset %lld for %d bytes\n",
sd->name,
(long long)ubio->bio_offset,
ubio->bio_buf->b_bcount);
if (rq->error == ENXIO) { /* the drive's down too */
log(LOG_ERR,
"%s: fatal drive I/O error, offset %lld for %d bytes\n",
DRIVE[rqe->driveno].label.name,
(long long)bio->bio_offset,
bp->b_bcount);
DRIVE[rqe->driveno].lasterror = rq->error;
set_drive_state(rqe->driveno, /* take the drive down */
drive_down,
setstate_force);
}
}
/* Now update the statistics */
if (bp->b_cmd == BUF_CMD_READ) { /* read operation */
DRIVE[rqe->driveno].reads++;
DRIVE[rqe->driveno].bytes_read += bp->b_bcount;
SD[rqe->sdno].reads++;
SD[rqe->sdno].bytes_read += bp->b_bcount;
PLEX[rqe->rqg->plexno].reads++;
PLEX[rqe->rqg->plexno].bytes_read += bp->b_bcount;
if (PLEX[rqe->rqg->plexno].volno >= 0) { /* volume I/O, not plex */
VOL[PLEX[rqe->rqg->plexno].volno].reads++;
VOL[PLEX[rqe->rqg->plexno].volno].bytes_read += bp->b_bcount;
}
} else { /* write operation */
DRIVE[rqe->driveno].writes++;
DRIVE[rqe->driveno].bytes_written += bp->b_bcount;
SD[rqe->sdno].writes++;
SD[rqe->sdno].bytes_written += bp->b_bcount;
PLEX[rqe->rqg->plexno].writes++;
PLEX[rqe->rqg->plexno].bytes_written += bp->b_bcount;
if (PLEX[rqe->rqg->plexno].volno >= 0) { /* volume I/O, not plex */
VOL[PLEX[rqe->rqg->plexno].volno].writes++;
VOL[PLEX[rqe->rqg->plexno].volno].bytes_written += bp->b_bcount;
}
}
if (rqg->flags & XFR_RECOVERY_READ) { /* recovery read, */
int *sdata; /* source */
int *data; /* and group data */
int length; /* and count involved */
int count; /* loop counter */
struct rqelement *urqe = &rqg->rqe[rqg->badsdno]; /* rqe of the bad subdisk */
/* XOR destination is the user data */
sdata = (int *) &rqe->b.b_data[rqe->groupoffset << DEV_BSHIFT]; /* old data contents */
data = (int *) &urqe->b.b_data[urqe->groupoffset << DEV_BSHIFT]; /* destination */
length = urqe->grouplen * (DEV_BSIZE / sizeof(int)); /* and number of ints */
for (count = 0; count < length; count++)
data[count] ^= sdata[count];
/*
* In a normal read, we will normally read directly
* into the user buffer. This doesn't work if
* we're also doing a recovery, so we have to
* copy it
*/
if (rqe->flags & XFR_NORMAL_READ) { /* normal read as well, */
char *src = &rqe->b.b_data[rqe->dataoffset << DEV_BSHIFT]; /* read data is here */
char *dst;
dst = (char *) ubio->bio_buf->b_data + (rqe->useroffset << DEV_BSHIFT); /* where to put it in user buffer */
length = rqe->datalen << DEV_BSHIFT; /* and count involved */
bcopy(src, dst, length); /* move it */
}
} else if ((rqg->flags & (XFR_NORMAL_WRITE | XFR_DEGRADED_WRITE)) /* RAID 4/5 group write operation */
&&(rqg->active == 1)) /* and this is the last active request */
complete_raid5_write(rqe);
/*
* This is the earliest place where we can be
* sure that the request has really finished,
* since complete_raid5_write can issue new
* requests.
*/
rqg->active--; /* this request now finished */
if (rqg->active == 0) { /* request group finished, */
rq->active--; /* one less */
if (rqg->lock) { /* got a lock? */
unlockrange(rqg->plexno, rqg->lock); /* yes, free it */
rqg->lock = 0;
}
}
if (rq->active == 0) { /* request finished, */
#ifdef VINUMDEBUG
if (debug & DEBUG_RESID) {
if (ubio->bio_buf->b_resid != 0) /* still something to transfer? */
Debugger("resid");
}
#endif
if (rq->error) { /* did we have an error? */
if (rq->isplex) { /* plex operation, */
ubio->bio_buf->b_flags |= B_ERROR; /* yes, propagate to user */
ubio->bio_buf->b_error = rq->error;
} else { /* try to recover */
di.rq = rq;
queue_daemon_request(daemonrq_ioerror, di); /* let the daemon complete */
}
} else {
ubio->bio_buf->b_resid = 0; /* completed our transfer */
if (rq->isplex == 0) /* volume request, */
VOL[rq->volplex.volno].active--; /* another request finished */
biodone(ubio); /* top level buffer completed */
freerq(rq); /* return the request storage */
}
}
rel_mplock();
}
