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

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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