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

1.1     ! root        1: /* lfsnewd.c - lfsnewd */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <disk.h>
        !             6: #include <lfile.h>
        !             7: #include <dir.h>
        !             8: 
        !             9: #define  DFILLER  '+'
        !            10: 
        !            11: /*------------------------------------------------------------------------
        !            12:  *  lfsnewd  --  allocate a new data block from free list on disk
        !            13:  *------------------------------------------------------------------------
        !            14:  */
        !            15: lfsnewd(diskdev, flptr)
        !            16: int    diskdev;
        !            17: struct flblk   *flptr;
        !            18: {
        !            19:        struct  iblock  *ibptr;
        !            20:        struct  dir     *dirptr;
        !            21:        struct  freeblk *fbptr;
        !            22:        char    *buf;
        !            23:        int     sem;
        !            24:        DBADDR  dba;
        !            25:        int     i;
        !            26: 
        !            27:        dirptr = dsdirec(diskdev);
        !            28:        fbptr = (struct freeblk *) (buf = flptr->fl_buff);
        !            29:        sem = ((struct dsblk *)devtab[diskdev].dvioblk)->dflsem; 
        !            30:        wait(sem);
        !            31:        dba = dirptr->d_fblst;
        !            32:        read(diskdev, fbptr, dba);
        !            33:        dirptr->d_fblst = fbptr->fbnext;
        !            34:        write(diskdev, dskbcpy(dirptr), DIRBLK);
        !            35:        signal(sem);
        !            36:        for (i=0 ; i<DBUFSIZ ; i++)
        !            37:                *buf++ = DFILLER;
        !            38:        write(diskdev, dskbcpy(fbptr), dba);
        !            39:        return(dba);
        !            40: }

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