Help on reiserfs documentation

Help on reiserfs documentation

[Mpriyan]

Hello All,

I'm learning about reiserfs. So, I'm looking for some documentation that can
explain how the file data is organized on disk in reiserfs 3.6. The
documentation that is available in www.namesys.com says that it is for reiserfs 4.

Do reiserfs 3.6 and reiserfs 4 have same ondisk structure ? I understand that
they differ in the way they provide the atomicity. But other than that do they
have the same layout ?

Does reiserfs 3.6 use B+ tree for storing its data ? In the source code,
it looks like they use some stree. Are there standard definitions of stree
? Or is it a variant of B+ tree with a different name ?

If someone can point me to some documentation, it would be of great help.

-M

Re: Help on reiserfs documentation

[Christian Mayrhuber]

On Tuesday 21 September 2004 23:11, Mpriyan wrote:
> Hello All,
> 
> I'm learning about reiserfs. So, I'm looking for some documentation that can
> explain how the file data is organized on disk in reiserfs 3.6. The
> documentation that is available in www.namesys.com says that it is for 
reiserfs 4.
> 
> Do reiserfs 3.6 and reiserfs 4 have same ondisk structure ? I understand 
that
> they differ in the way they provide the atomicity. But other than that do 
they
> have the same layout ?

No they are different.
If you want to do some development/dig deeper you should look at reiser4, as 
it supports plugins and fixes some design mistakes reiser3 had and it has
cleaner code. I guess this is the cause why the reiser3 documentation has 
disappeared from the namesys homepage.
http://www.namesys.com/v4/v4.html is a good starting point.
The other documentation I know of is the reiser4 source code available
in recent -mm kernel series :-)

> 
> Does reiserfs 3.6 use B+ tree for storing its data ? In the source code,
> it looks like they use some stree. Are there standard definitions of stree
> ? Or is it a variant of B+ tree with a different name ?
> 
> If someone can point me to some documentation, it would be of great help.
> 
> -M
> 

-- 
lg, Chris

Re: Help on reiserfs documentation

[Jeff Mahoney]

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Mpriyan wrote:
| Hello All,
|
| I'm learning about reiserfs. So, I'm looking for some documentation
that can
| explain how the file data is organized on disk in reiserfs 3.6. The
| documentation that is available in www.namesys.com says that it is for
reiserfs 4.
|
| Do reiserfs 3.6 and reiserfs 4 have same ondisk structure ? I
understand that
| they differ in the way they provide the atomicity. But other than that
do they
| have the same layout ?
|
| Does reiserfs 3.6 use B+ tree for storing its data ? In the source code,
| it looks like they use some stree. Are there standard definitions of stree
| ? Or is it a variant of B+ tree with a different name ?
|
| If someone can point me to some documentation, it would be of great help.

There used to be documentation that described this very nicely.
Fortunately, the wayback machine still has it.

Check out:
http://web.archive.org/web/20021013181038/www.namesys.com/content_table.html

Another good source for understanding the format is the reiserfs code in
grub. It's read-only support, which makes the implementation quite small
since it removes most of the complexity in the kernel implementation. If
I recall correctly, the format is even described in the comments.

Hans - Is this information still available at namesys.com? I understand
that you're primarily supporting reiser4, but all the information
previously online about reiser3 is still valuable.

- -Jeff

- --
Jeff Mahoney
SuSE Labs
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