Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!stat!vsserv!nu.cs.fsu.edu!nall
From: nall@nu.cs.fsu.edu (John Nall)
Newsgroups: comp.os.minix
Subject: Re: Large Disks
Message-ID: <243@vsserv.scri.fsu.edu>
Date: 4 Oct 89 14:24:22 GMT
Sender: news@vsserv.scri.fsu.edu
Reply-To: nall@nu.cs.fsu.edu (John Nall)
Organization: Florida State University
Lines: 85

The following are the (very minor) changes to mkfs.c which will allow
it to make a file system greater than 32 MB.  No guarantees come with
the code, but I have tested it fairly extensively, making a 40 MB
partition (checks out mkfs), copying most of an existing 20 MB partition
to it (checks out at_wini), and doing random checks on the resulting
files.  (A du of both partitions looked good).  I also used fsck on the
40 MB partition, and it appears successful.

One minor problem which I have not fixed -- df prints out negative
numbers when the number of blocks is greater than 32K.  I looked at
the code in df, and it is more of a hassle to fix it than it is worth
right now (the negative number is easily mentally converted to the
right value).

This is, of course, a listing from cdiff.
---------------------------cut here------------------

*** /usr/minix/tools/mkfs.c	Thu Jul 13 10:43:31 1989
--- /usr/minix/commands/mkfs.c	Tue Oct  3 16:06:41 1989
***************
*** 45,52 ****
  #define BIN                  2
  #define BINGRP               2
  #define BIT_MAP_SHIFT       13
! #define N_BLOCKS         32000		/* must be multiple of 8 */
! 
  #ifdef DOS
  #  define BREAD		     4
  #  define BWRITE	     5
--- 45,52 ----
  #define BIN                  2
  #define BINGRP               2
  #define BIT_MAP_SHIFT       13
! #define N_BLOCKS         65528		/* must be multiple of 8 */
! 					/* (65536 is a no-no)  */ 
  #ifdef DOS
  #  define BREAD		     4
  #  define BWRITE	     5
***************
*** 56,65 ****
  #endif
  
  
! int next_zone, next_inode, zone_size, zone_shift=0, zoff, nrblocks,inode_offset,
!     nrinodes, lct=1, disk, fd, print=0, file=0, override=0, simple=0, dflag;
! int donttest;			/* skip test if it fits on medium */
! 
  long current_time, bin_time;
  char zero[BLOCK_SIZE], *lastp;
  char umap[(N_BLOCKS+8)/8];	/* bit map tells if block read yet */
--- 56,65 ----
  #endif
  
  
! int next_zone, next_inode, zone_size, zone_shift=0, zoff, inode_offset,
!     nrinodes, lct=1, disk, fd, print=0, file=0, override=0, simple=0, dflag;
! int donttest;			/* skip test if it fits on medium */
! unsigned int nrblocks;
  long current_time, bin_time;
  char zero[BLOCK_SIZE], *lastp;
  char umap[(N_BLOCKS+8)/8];	/* bit map tells if block read yet */
***************
*** 79,86 ****
  int argc;
  char *argv[];
  {
!   int i, blocks, zones, inodes, mode, usrid, grpid, badusage = 0;
!   char *token[MAX_TOKENS], line[LINE_LEN];
    FILE *fopen();
    long time(), ls;
    struct stat statbuf;
--- 79,87 ----
  int argc;
  char *argv[];
  {
!   int i, zones, inodes, mode, usrid, grpid, badusage = 0;
!   char *token[MAX_TOKENS], line[LINE_LEN];
!   unsigned int blocks;
    FILE *fopen();
    long time(), ls;
    struct stat statbuf;
======================================================================
John Nall                              Internet:  nall@nu.cs.fsu.edu
Computer Science Department            Florida State University
    "Today, a Moon Moth -- tomorrow, a Sea Dragon Conquerer!!"