cf53cf132b
Get counting volume I/Os right. Count buffer sizes correctly for architectures where ints are not 32 bits. complete_rqe: Move decrementing active count until after call to complete_raid5_write, thus possibly avoiding a race condition. Suggested-by: dillon Rename user bp to ubp to avoid confusion. Tidy up comments.
427 lines
17 KiB
C
427 lines
17 KiB
C
/* vinuminterrupt.c: bottom half of the driver */
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/*-
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* Copyright (c) 1997, 1998, 1999
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* Nan Yang Computer Services Limited. All rights reserved.
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*
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* Parts copyright (c) 1997, 1998 Cybernet Corporation, NetMAX project.
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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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* $Id: vinuminterrupt.c,v 1.9 2000/02/16 01:59:02 grog Exp grog $
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* $FreeBSD$
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*/
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#include <dev/vinum/vinumhdr.h>
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#include <dev/vinum/request.h>
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#include <sys/resourcevar.h>
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void complete_raid5_write(struct rqelement *);
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void complete_rqe(struct buf *bp);
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void sdio_done(struct buf *bp);
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/*
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* Take a completed buffer, transfer the data back if
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* it's a read, and complete the high-level request
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* if this is the last subrequest.
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*
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* The bp parameter is in fact a struct rqelement, which
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* includes a couple of extras at the end.
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*/
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void
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complete_rqe(struct buf *bp)
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{
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struct rqelement *rqe;
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struct request *rq;
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struct rqgroup *rqg;
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struct buf *ubp; /* user buffer */
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struct drive *drive;
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rqe = (struct rqelement *) bp; /* point to the element element that completed */
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rqg = rqe->rqg; /* and the request group */
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rq = rqg->rq; /* and the complete request */
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ubp = rq->bp; /* user buffer */
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#ifdef VINUMDEBUG
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if (debug & DEBUG_LASTREQS)
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logrq(loginfo_iodone, (union rqinfou) rqe, ubp);
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#endif
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drive = &DRIVE[rqe->driveno];
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drive->active--; /* one less outstanding I/O on this drive */
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vinum_conf.active--; /* one less outstanding I/O globally */
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if ((drive->active == (DRIVE_MAXACTIVE - 1)) /* we were at the drive limit */
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||(vinum_conf.active == VINUM_MAXACTIVE)) /* or the global limit */
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wakeup(&launch_requests); /* let another one at it */
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if ((bp->b_io.bio_flags & BIO_ERROR) != 0) { /* transfer in error */
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if (bp->b_error != 0) /* did it return a number? */
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rq->error = bp->b_error; /* yes, put it in. */
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else if (rq->error == 0) /* no: do we have one already? */
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rq->error = EIO; /* no: catchall "I/O error" */
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SD[rqe->sdno].lasterror = rq->error;
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if (bp->b_iocmd == BIO_READ) { /* read operation */
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log(LOG_ERR, "%s: fatal read I/O error\n", SD[rqe->sdno].name);
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set_sd_state(rqe->sdno, sd_crashed, setstate_force); /* subdisk is crashed */
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} else { /* write operation */
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log(LOG_ERR, "%s: fatal write I/O error\n", SD[rqe->sdno].name);
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set_sd_state(rqe->sdno, sd_stale, setstate_force); /* subdisk is stale */
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}
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if (rq->error == ENXIO) { /* the drive's down too */
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log(LOG_ERR, "%s: fatal drive I/O error\n", DRIVE[rqe->driveno].label.name);
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DRIVE[rqe->driveno].lasterror = rq->error;
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set_drive_state(rqe->driveno, /* take the drive down */
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drive_down,
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setstate_force);
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}
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}
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/* Now update the statistics */
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if (bp->b_iocmd == BIO_READ) { /* read operation */
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DRIVE[rqe->driveno].reads++;
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DRIVE[rqe->driveno].bytes_read += bp->b_bcount;
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SD[rqe->sdno].reads++;
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SD[rqe->sdno].bytes_read += bp->b_bcount;
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PLEX[rqe->rqg->plexno].reads++;
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PLEX[rqe->rqg->plexno].bytes_read += bp->b_bcount;
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if (PLEX[rqe->rqg->plexno].volno >= 0) { /* volume I/O, not plex */
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VOL[PLEX[rqe->rqg->plexno].volno].reads++;
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VOL[PLEX[rqe->rqg->plexno].volno].bytes_read += bp->b_bcount;
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}
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} else { /* write operation */
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DRIVE[rqe->driveno].writes++;
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DRIVE[rqe->driveno].bytes_written += bp->b_bcount;
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SD[rqe->sdno].writes++;
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SD[rqe->sdno].bytes_written += bp->b_bcount;
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PLEX[rqe->rqg->plexno].writes++;
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PLEX[rqe->rqg->plexno].bytes_written += bp->b_bcount;
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if (PLEX[rqe->rqg->plexno].volno >= 0) { /* volume I/O, not plex */
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VOL[PLEX[rqe->rqg->plexno].volno].writes++;
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VOL[PLEX[rqe->rqg->plexno].volno].bytes_written += bp->b_bcount;
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}
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}
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if (rqg->flags & XFR_RECOVERY_READ) { /* recovery read, */
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int *sdata; /* source */
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int *data; /* and group data */
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int length; /* and count involved */
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int count; /* loop counter */
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struct rqelement *urqe = &rqg->rqe[rqg->badsdno]; /* rqe of the bad subdisk */
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/* XOR destination is the user data */
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sdata = (int *) &rqe->b.b_data[rqe->groupoffset << DEV_BSHIFT]; /* old data contents */
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data = (int *) &urqe->b.b_data[urqe->groupoffset << DEV_BSHIFT]; /* destination */
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length = urqe->grouplen * (DEV_BSIZE / sizeof(int)); /* and number of ints */
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for (count = 0; count < length; count++)
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data[count] ^= sdata[count];
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/*
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* In a normal read, we will normally read directly
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* into the user buffer. This doesn't work if
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* we're also doing a recovery, so we have to
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* copy it
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*/
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if (rqe->flags & XFR_NORMAL_READ) { /* normal read as well, */
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char *src = &rqe->b.b_data[rqe->dataoffset << DEV_BSHIFT]; /* read data is here */
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char *dst;
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dst = (char *) ubp->b_data + (rqe->useroffset << DEV_BSHIFT); /* where to put it in user buffer */
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length = rqe->datalen << DEV_BSHIFT; /* and count involved */
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bcopy(src, dst, length); /* move it */
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}
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} else if ((rqg->flags & (XFR_NORMAL_WRITE | XFR_DEGRADED_WRITE)) /* RAID 4/5 group write operation */
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&&(rqg->active == 1)) /* and this is the last active request */
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complete_raid5_write(rqe);
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/*
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* This is the earliest place where we can be
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* sure that the request has really finished,
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* since complete_raid5_write can issue new
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* requests.
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*/
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rqg->active--; /* this request now finished */
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if (rqg->active == 0) { /* request group finished, */
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rq->active--; /* one less */
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if (rqg->lock) { /* got a lock? */
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unlockrange(rqg->plexno, rqg->lock); /* yes, free it */
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rqg->lock = 0;
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}
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}
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if (rq->active == 0) { /* request finished, */
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#if VINUMDEBUG
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if (debug & DEBUG_RESID) {
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if (ubp->b_resid != 0) /* still something to transfer? */
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Debugger("resid");
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}
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#endif
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if (rq->error) { /* did we have an error? */
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if (rq->isplex) { /* plex operation, */
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ubp->b_io.bio_flags |= BIO_ERROR; /* yes, propagate to user */
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ubp->b_error = rq->error;
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} else /* try to recover */
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queue_daemon_request(daemonrq_ioerror, (union daemoninfo) rq); /* let the daemon complete */
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} else {
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ubp->b_resid = 0; /* completed our transfer */
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if (rq->isplex == 0) /* volume request, */
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VOL[rq->volplex.volno].active--; /* another request finished */
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bufdone(ubp); /* top level buffer completed */
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freerq(rq); /* return the request storage */
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}
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}
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}
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/* Free a request block and anything hanging off it */
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void
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freerq(struct request *rq)
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{
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struct rqgroup *rqg;
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struct rqgroup *nrqg; /* next in chain */
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int rqno;
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for (rqg = rq->rqg; rqg != NULL; rqg = nrqg) { /* through the whole request chain */
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if (rqg->lock) /* got a lock? */
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unlockrange(rqg->plexno, rqg->lock); /* yes, free it */
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for (rqno = 0; rqno < rqg->count; rqno++)
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if ((rqg->rqe[rqno].flags & XFR_MALLOCED) /* data buffer was malloced, */
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&&rqg->rqe[rqno].b.b_data) /* and the allocation succeeded */
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Free(rqg->rqe[rqno].b.b_data); /* free it */
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nrqg = rqg->next; /* note the next one */
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Free(rqg); /* and free this one */
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}
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Free(rq); /* free the request itself */
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}
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/* I/O on subdisk completed */
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void
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sdio_done(struct buf *bp)
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{
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struct sdbuf *sbp;
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sbp = (struct sdbuf *) bp;
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if (sbp->b.b_io.bio_flags & BIO_ERROR) { /* had an error */
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sbp->bp->b_io.bio_flags |= BIO_ERROR; /* propagate upwards */
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sbp->bp->b_error = sbp->b.b_error;
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}
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#ifdef VINUMDEBUG
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if (debug & DEBUG_LASTREQS)
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logrq(loginfo_sdiodone, (union rqinfou) bp, bp);
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#endif
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sbp->bp->b_resid = sbp->b.b_resid; /* copy the resid field */
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/* Now update the statistics */
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if (bp->b_iocmd == BIO_READ) { /* read operation */
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DRIVE[sbp->driveno].reads++;
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DRIVE[sbp->driveno].bytes_read += sbp->b.b_bcount;
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SD[sbp->sdno].reads++;
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SD[sbp->sdno].bytes_read += sbp->b.b_bcount;
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} else { /* write operation */
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DRIVE[sbp->driveno].writes++;
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DRIVE[sbp->driveno].bytes_written += sbp->b.b_bcount;
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SD[sbp->sdno].writes++;
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SD[sbp->sdno].bytes_written += sbp->b.b_bcount;
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}
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bufdone(sbp->bp); /* complete the caller's I/O */
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Free(sbp);
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}
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/* Start the second phase of a RAID-4 or RAID-5 group write operation. */
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void
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complete_raid5_write(struct rqelement *rqe)
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{
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int *sdata; /* source */
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int *pdata; /* and parity block data */
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int length; /* and count involved */
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int count; /* loop counter */
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int rqno; /* request index */
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int rqoffset; /* offset of request data from parity data */
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struct buf *ubp; /* user buffer header */
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struct request *rq; /* pointer to our request */
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struct rqgroup *rqg; /* and to the request group */
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struct rqelement *prqe; /* point to the parity block */
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struct drive *drive; /* drive to access */
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rqg = rqe->rqg; /* and to our request group */
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rq = rqg->rq; /* point to our request */
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ubp = rq->bp; /* user's buffer header */
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prqe = &rqg->rqe[0]; /* point to the parity block */
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/*
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* If we get to this function, we have normal or
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* degraded writes, or a combination of both. We do
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* the same thing in each case: we perform an
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* exclusive or to the parity block. The only
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* difference is the origin of the data and the
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* address range.
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*/
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if (rqe->flags & XFR_DEGRADED_WRITE) { /* do the degraded write stuff */
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pdata = (int *) (&prqe->b.b_data[(prqe->groupoffset) << DEV_BSHIFT]); /* parity data pointer */
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bzero(pdata, prqe->grouplen << DEV_BSHIFT); /* start with nothing in the parity block */
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/* Now get what data we need from each block */
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for (rqno = 1; rqno < rqg->count; rqno++) { /* for all the data blocks */
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rqe = &rqg->rqe[rqno]; /* this request */
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sdata = (int *) (&rqe->b.b_data[rqe->groupoffset << DEV_BSHIFT]); /* old data */
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length = rqe->grouplen << (DEV_BSHIFT - 2); /* and count involved */
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/*
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* Add the data block to the parity block. Before
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* we started the request, we zeroed the parity
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* block, so the result of adding all the other
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* blocks and the block we want to write will be
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* the correct parity block.
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*/
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for (count = 0; count < length; count++)
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pdata[count] ^= sdata[count];
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if ((rqe->flags & XFR_MALLOCED) /* the buffer was malloced, */
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&&((rqg->flags & XFR_NORMAL_WRITE) == 0)) { /* and we have no normal write, */
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Free(rqe->b.b_data); /* free it now */
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rqe->flags &= ~XFR_MALLOCED;
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}
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}
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}
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if (rqg->flags & XFR_NORMAL_WRITE) { /* do normal write stuff */
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/* Get what data we need from each block */
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for (rqno = 1; rqno < rqg->count; rqno++) { /* for all the data blocks */
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rqe = &rqg->rqe[rqno]; /* this request */
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if ((rqe->flags & (XFR_DATA_BLOCK | XFR_BAD_SUBDISK | XFR_NORMAL_WRITE))
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== (XFR_DATA_BLOCK | XFR_NORMAL_WRITE)) { /* good data block to write */
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sdata = (int *) &rqe->b.b_data[rqe->dataoffset << DEV_BSHIFT]; /* old data contents */
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rqoffset = rqe->dataoffset + rqe->sdoffset - prqe->sdoffset; /* corresponding parity block offset */
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pdata = (int *) (&prqe->b.b_data[rqoffset << DEV_BSHIFT]); /* parity data pointer */
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length = rqe->datalen * (DEV_BSIZE / sizeof(int)); /* and number of ints */
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/*
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* "remove" the old data block
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* from the parity block
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*/
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if ((pdata < ((int *) prqe->b.b_data))
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|| (&pdata[length] > ((int *) (prqe->b.b_data + prqe->b.b_bcount)))
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|| (sdata < ((int *) rqe->b.b_data))
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|| (&sdata[length] > ((int *) (rqe->b.b_data + rqe->b.b_bcount))))
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panic("complete_raid5_write: bounds overflow");
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for (count = 0; count < length; count++)
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pdata[count] ^= sdata[count];
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/* "add" the new data block */
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sdata = (int *) (&ubp->b_data[rqe->useroffset << DEV_BSHIFT]); /* new data */
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if ((sdata < ((int *) ubp->b_data))
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|| (&sdata[length] > ((int *) (ubp->b_data + ubp->b_bcount))))
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panic("complete_raid5_write: bounds overflow");
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for (count = 0; count < length; count++)
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pdata[count] ^= sdata[count];
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/* Free the malloced buffer */
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if (rqe->flags & XFR_MALLOCED) { /* the buffer was malloced, */
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Free(rqe->b.b_data); /* free it */
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rqe->flags &= ~XFR_MALLOCED;
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} else
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panic("complete_raid5_write: malloc conflict");
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if ((rqe->b.b_iocmd == BIO_READ) /* this was a read */
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&&((rqe->flags & XFR_BAD_SUBDISK) == 0)) { /* and we can write this block */
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rqe->b.b_flags &= ~B_DONE; /* we're not done */
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rqe->b.b_iocmd = BIO_WRITE; /* we're writing now */
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rqe->b.b_iodone = complete_rqe; /* call us here when done */
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rqe->flags &= ~XFR_PARITYOP; /* reset flags that brought us here */
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rqe->b.b_data = &ubp->b_data[rqe->useroffset << DEV_BSHIFT]; /* point to the user data */
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rqe->b.b_bcount = rqe->datalen << DEV_BSHIFT; /* length to write */
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rqe->b.b_bufsize = rqe->b.b_bcount; /* don't claim more */
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rqe->b.b_resid = rqe->b.b_bcount; /* nothing transferred */
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rqe->b.b_blkno += rqe->dataoffset; /* point to the correct block */
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rqg->active++; /* another active request */
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drive = &DRIVE[rqe->driveno]; /* drive to access */
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/* We can't sleep here, so we just increment the counters. */
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drive->active++;
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if (drive->active >= drive->maxactive)
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drive->maxactive = drive->active;
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vinum_conf.active++;
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if (vinum_conf.active >= vinum_conf.maxactive)
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vinum_conf.maxactive = vinum_conf.active;
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#if VINUMDEBUG
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if (debug & DEBUG_ADDRESSES)
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log(LOG_DEBUG,
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" %s dev %d.%d, sd %d, offset 0x%x, devoffset 0x%x, length %ld\n",
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rqe->b.b_iocmd == BIO_READ ? "Read" : "Write",
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major(rqe->b.b_dev),
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minor(rqe->b.b_dev),
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rqe->sdno,
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(u_int) (rqe->b.b_blkno - SD[rqe->sdno].driveoffset),
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rqe->b.b_blkno,
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rqe->b.b_bcount);
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if (debug & DEBUG_LASTREQS)
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logrq(loginfo_raid5_data, (union rqinfou) rqe, ubp);
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#endif
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DEV_STRATEGY(&rqe->b, 0);
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}
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}
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}
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}
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/* Finally, write the parity block */
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rqe = &rqg->rqe[0];
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rqe->b.b_flags &= ~B_DONE; /* we're not done */
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rqe->b.b_iocmd = BIO_WRITE; /* we're writing now */
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rqe->b.b_iodone = complete_rqe; /* call us here when done */
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rqg->flags &= ~XFR_PARITYOP; /* reset flags that brought us here */
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rqe->b.b_bcount = rqe->buflen << DEV_BSHIFT; /* length to write */
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rqe->b.b_bufsize = rqe->b.b_bcount; /* don't claim we have more */
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rqe->b.b_resid = rqe->b.b_bcount; /* nothing transferred */
|
|
rqg->active++; /* another active request */
|
|
drive = &DRIVE[rqe->driveno]; /* drive to access */
|
|
|
|
/* We can't sleep here, so we just increment the counters. */
|
|
drive->active++;
|
|
if (drive->active >= drive->maxactive)
|
|
drive->maxactive = drive->active;
|
|
vinum_conf.active++;
|
|
if (vinum_conf.active >= vinum_conf.maxactive)
|
|
vinum_conf.maxactive = vinum_conf.active;
|
|
|
|
#if VINUMDEBUG
|
|
if (debug & DEBUG_ADDRESSES)
|
|
log(LOG_DEBUG,
|
|
" %s dev %d.%d, sd %d, offset 0x%x, devoffset 0x%x, length %ld\n",
|
|
rqe->b.b_iocmd == BIO_READ ? "Read" : "Write",
|
|
major(rqe->b.b_dev),
|
|
minor(rqe->b.b_dev),
|
|
rqe->sdno,
|
|
(u_int) (rqe->b.b_blkno - SD[rqe->sdno].driveoffset),
|
|
rqe->b.b_blkno,
|
|
rqe->b.b_bcount);
|
|
if (debug & DEBUG_LASTREQS)
|
|
logrq(loginfo_raid5_parity, (union rqinfou) rqe, ubp);
|
|
#endif
|
|
DEV_STRATEGY(&rqe->b, 0);
|
|
}
|
|
|
|
/* Local Variables: */
|
|
/* fill-column: 50 */
|
|
/* End: */
|