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Annotation of xinu/sys/LSI/dsksync.c, revision 1.1.1.1

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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