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Annotation of xinu/sys/LSI/dsksync.c, revision 1.1

1.1     ! root        1: /* dsksync.c - dsksync */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: #include <disk.h>
        !             7: 
        !             8: /*------------------------------------------------------------------------
        !             9:  *  dsksync  --  wait for all outstanding disk requests before returning
        !            10:  *------------------------------------------------------------------------
        !            11:  */
        !            12: dsksync(devptr)
        !            13: struct devsw   *devptr;
        !            14: {
        !            15:        struct  dreq    *drptr, *p, *q;
        !            16:        int     stat;
        !            17: 
        !            18:        if ( (q=(devptr->dvioblk)->dreqlst) == DRNULL )
        !            19:                return(OK);
        !            20:        drptr = (struct dreq *) getbuf(dskrbp);
        !            21:        drptr->drdba = 0;
        !            22:        drptr->drpid = currpid;
        !            23:        drptr->drbuff = NULL;
        !            24:        drptr->drop = DSYNC;
        !            25:        drptr->drnext = DRNULL;
        !            26: 
        !            27:        /* place at end of request list */
        !            28: 
        !            29:        for (p=q->drnext ; p!=DRNULL ; q=p,p=p->drnext)
        !            30:                ;
        !            31:        q->drnext = drptr;
        !            32:        drptr->drstat = SYSERR;
        !            33:        suspend(currpid);
        !            34:        stat = drptr->drstat;
        !            35:        freebuf(drptr);
        !            36:        return(stat);
        !            37: }

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