Re: V7 filesystem work - TUHS

21 Feb 1999

Yeah, I'm interested.  Can you write up what changes the linux port entailed???

-Mike

At 07:10 PM 2/20/99 +0100, g4klx(a)g4klx.demon.co.uk wrote:
...
 Hello All

A couple of weeks ago I hacked the program v7 from the bostic_tools to
work under all sorts of different Unix versions. It worked great and
allowed me to snoop around the V7 file system images from native Linux.
Anyone who wants a copy can send me an e-mail.

Anyway I had a few hours spare today, and decided to try adding the V7
filesystem to the Linux kernel. Results so far are encouraging:

g4klx:/usr/src/linux# ls -l /mnt
total 333
drwxrwxrwx   7 root     root          224 Sep 22  1988 .
drwxr-xr-x  19 root     root         1024 Feb 14 11:55 ..
drwxrwxr-x   2 3        3            2512 Sep 22  1988 bin
-rwxr-xr-x   1 3        3            8986 Jun  8  1979 boot
drwxrwxr-x   2 3        3             160 Sep 22  1988 dev
drwxrwxr-x   2 3        3             336 Sep 22  1988 etc
-rwxr-xr-x   1 daemon   daemon      53302 Jun  8  1979 hphtunix
-rwxr-xr-x   1 daemon   daemon      52850 Jun  8  1979 hptmunix
drwxrwxr-x   2 3        3             192 Sep 22  1988 lib
drwxrwxr-x   2 root     lp             96 Sep 22  1988 mdec
-rwxr-xr-x   1 root     daemon      50990 Jun  8  1979 rkunix
-rwxr-xr-x   1 root     daemon      51982 Jun  8  1979 rl2unix
-rwxr-xr-x   1 daemon   daemon      51790 Jun  8  1979 rphtunix
-rwxr-xr-x   1 daemon   daemon      51274 Jun  8  1979 rptmunix
g4klx:/usr/src/linux# df
Filesystem         1024-blocks  Used Available Capacity Mounted on
/dev/hda1            3031184 1920771   953665     67%   /
/dev/loop0              1919    1877       42     98%   /mnt
g4klx:/usr/src/linux#

I am using the loop block device to allow me to mount a file as a block
device, this saves me having to add a new partition to my disc. There
should be no reason why it won't work with a true disc partition. The V7
filesystem under Linux is read/write.

Anyone interested ?

Jonathan

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 From Warren Toomey &lt;wkt(a)henry.cs.adfa.edu.au&gt; Sun
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Subject: Re: V7 filesystem work
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Naylor at "Feb 20, 1999  7:10:45 pm"
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In article by Jonathan Naylor:
...
  Hello All

 A couple of weeks ago I hacked the program v7 from the bostic_tools to
 work under all sorts of different Unix versions. It worked great and
 allowed me to snoop around the V7 file system images from native Linux.
 Anyone who wants a copy can send me an e-mail.

 Anyway I had a few hours spare today, and decided to try adding the V7
 filesystem to the Linux kernel. Results so far are encouraging: 
...
  I am using the loop block device to allow me to mount
a file as a block
 device, this saves me having to add a new partition to my disc. There
 should be no reason why it won't work with a true disc partition. The V7
 filesystem under Linux is read/write.

 Anyone interested ? 
I'd be happy to add any changes etc. into the Tools directory in the PUPS
Archive.

It's about time Unix could read the Unix filesystem again :-)

Ciao,
	Warren

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 From Jonathan Naylor &lt;g4klx(a)pop.agri.ch&gt; Sun Feb
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To: Mike Allison &lt;mallison(a)konnections.com&gt;
cc: pups(a)minnie.cs.adfa.edu.au
Subject: Re: V7 filesystem work
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Hello Mike and the list

On Sat, 20 Feb 1999, Mike Allison wrote:
...
  Yeah, I'm interested.  Can you write up what
changes the linux port entailed???

 -Mike 
I assume you mean the standalone V7 FS program rather than the kernel V7
FS support ?

The code was written in old C, and from a modern C programmers point of
view, rather sloppily. The warnings from the compiler were terrible, so I
added function prototypes, and made the code more ANSI C like. Then I got
rid of a few bugs, in one place I remember a character pointer being
assigned to a character.

I then typedef'd the data types so I could use int8, int16 and int32 in
the code to make it more portable. I stopped using structure overlays onto
the raw data as that is messy and is not good for (a) byte ordering and
(b) structure packing. It also allowed me to stop using the original V7
file headers which would have made a public release of the code
problematic.

The data is extracted from the raw block data by using special
architecturally neutral functions into locally held structures. That is a
particular win with the block number in three bytes trick that is used in
the inode.

It has been tested on i386/Linux with both glibc 1.0 and glibc 2.0 and
Alpha/Linux, no changes were needed.

Then I added a few new commands to let me look at the superblock and
bootblocks and a few other bits.

Then I released it.

I have just sent a copy of the program to Warren for inclusion in the PUPS
tools section. Its not very big.

Work is progressing on the V7 filesystem in the Linux kernel. Anyone who
wants the patches for that should send me an e-mail. I hope to get it into
the mainstream kernel in the Linux 2.3 series.

Jonathan