/* interrupt.c: bottom half of the driver */ /*- * 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: interrupt.c,v 1.1 1998/08/13 06:12:27 grog Exp grog $ */ #define REALLYKERNEL #include "vinumhdr.h" #include "request.h" #include #include void complete_raid5_write(struct rqelement *); void freerq(struct request *rq); void free_rqg(struct rqgroup *rqg); void complete_rqe(struct buf *bp); void sdio_done(struct buf *bp); /* 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 buf *bp) { BROKEN_GDB; struct rqelement *rqe; struct request *rq; struct rqgroup *rqg; struct buf *ubp; /* user buffer */ rqe = (struct rqelement *) bp; /* point to the element element that completed */ rqg = rqe->rqg; /* and the request group */ rq = rqg->rq; /* and the complete request */ if ((bp->b_flags & B_ERROR) != 0) { /* transfer in error */ 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" */ if (rq->error == EIO) /* I/O error, */ set_sd_state(rqe->sdno, sd_crashed, setstate_force); /* take the subdisk down */ } /* Now update the statistics */ if (bp->b_flags & B_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; } 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; } ubp = rq->bp; /* user buffer */ rqg->active--; /* one less request active */ if (rqg->active == 0) /* request group finished, */ rq->active--; /* one less */ if (rq->active == 0) { /* request finished, */ #if DEBUG if (debug & 4) { if (ubp->b_resid != 0) /* still something to transfer? */ Debugger("resid"); { int i; for (i = 0; i < ubp->b_bcount; i += 512) /* XXX debug */ if (((char *) ubp->b_data)[i] != '<') { /* and not what we expected */ printf("At 0x%x (offset 0x%x): '%c' (0x%x)\n", (int) (&((char *) ubp->b_data)[i]), i, ((char *) ubp->b_data)[i], ((char *) ubp->b_data)[i]); Debugger("complete_request checksum"); } } } #endif if (rq->error) { /* did we have an error? */ ubp->b_flags |= B_ERROR; /* yes, propagate to user */ ubp->b_error = rq->error; } else ubp->b_resid = 0; /* completed our transfer */ if (rq->isplex == 0) /* volume request, */ VOL[rq->volplex.volno].active--; /* another request finished */ biodone(ubp); /* top level buffer completed */ freerq(rq); /* return the request storage */ } } /* Free a request block and anything hanging off it */ void freerq(struct request *rq) { BROKEN_GDB; struct rqgroup *rqg; struct rqgroup *nrqg; /* next in chain */ int rqno; for (rqg = rq->rqg; rqg != NULL; rqg = nrqg) { /* through the whole request chain */ for (rqno = 0; rqno < rqg->count; rqno++) if ((rqg->rqe[rqno].flags & XFR_MALLOCED) /* data buffer was malloced, */ &&rqg->rqe[rqno].b.b_data) /* and the allocation succeeded */ Free(rqg->rqe[rqno].b.b_data); /* free it */ nrqg = rqg->next; /* note the next one */ Free(rqg); /* and free this one */ } Free(rq); /* free the request itself */ } void free_rqg(struct rqgroup *rqg) { if ((rqg->flags & XFR_GROUPOP) /* RAID 5 request */ &&(rqg->rqe) /* got a buffer structure */ &&(rqg->rqe->b.b_data)) /* and it has a buffer allocated */ Free(rqg->rqe->b.b_data); /* free it */ } /* I/O on subdisk completed */ void sdio_done(struct buf *bp) { struct sdbuf *sbp; sbp = (struct sdbuf *) bp; if (sbp->b.b_flags & B_ERROR) { /* had an error */ bp->b_flags |= B_ERROR; bp->b_error = sbp->b.b_error; } bp->b_resid = sbp->b.b_resid; biodone(sbp->bp); /* complete the caller's I/O */ /* Now update the statistics */ if (bp->b_flags & B_READ) { /* read operation */ DRIVE[sbp->driveno].reads++; DRIVE[sbp->driveno].bytes_read += bp->b_bcount; SD[sbp->sdno].reads++; SD[sbp->sdno].bytes_read += bp->b_bcount; } else { /* write operation */ DRIVE[sbp->driveno].writes++; DRIVE[sbp->driveno].bytes_written += bp->b_bcount; SD[sbp->sdno].writes++; SD[sbp->sdno].bytes_written += bp->b_bcount; } Free(sbp); }