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

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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