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

1.1     ! root        1: /* ibfree.c - ibfree */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <io.h>
        !             6: #include <disk.h>
        !             7: #include <lfile.h>
        !             8: #include <dir.h>
        !             9: 
        !            10: /*------------------------------------------------------------------------
        !            11:  *  ibfree.c  --  deallocate an iblock and return to the free list
        !            12:  *------------------------------------------------------------------------
        !            13:  */
        !            14: ibfree(diskdev, inum)
        !            15: int    diskdev;
        !            16: IBADDR inum;
        !            17: {
        !            18:        struct  dir     *dirptr;
        !            19:        struct  iblk    *ibptr;
        !            20:        char    *buff;
        !            21:        DBADDR  dba;
        !            22:        int     i, sem;
        !            23: 
        !            24:        dirptr = dsdirec(diskdev);
        !            25:        buff = getbuf(dskdbp);
        !            26:        dba = ibtodb(inum);
        !            27:        read(diskdev, buff, dba);
        !            28:        ibptr = (struct iblk *)(buff + ibdisp(inum));
        !            29:        for (i=0 ; i<IBLEN ; i++)
        !            30:                if ( (dba=ibptr->ib_dba[i]) != DBNULL)
        !            31:                        lfsdfree(diskdev, dba);
        !            32:        sem = ( (struct dsblk *)devtab[diskdev].dvioblk )->dflsem;
        !            33:        wait(sem);
        !            34:        ibptr->ib_next = dirptr->d_filst;
        !            35:        dirptr->d_filst = inum;
        !            36:        write(diskdev, buff, dba);
        !            37:        write(diskdev, dskbcpy(dirptr), DIRBLK);
        !            38:        signal(sem);
        !            39:        return(OK);
        !            40: }

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