Re: Reiser4

Re: Reiser4

[Edward Shishkin]

On 2/21/08, gordan@bobich.net <gordan@bobich.net> wrote:

...

>  Is tail packing used by default? I seem to remember that it was not used
>  by default if compression was emabled. Is this the case? Is it possible to
>  use both compression and tail packing?
>

Transparent compression has nothing with tail packing.

Cryptcompress file plugin doesn't operate with tails/extents.
This is a different file plugin, that can be considered as another
file system, which uses the same low-level code (nodes,
balancing, etc).

Tails/extents are a business of (default) unix-file plugin,
whereas cryptcompress file plugin operates only with so-called
"ctail items", which look mostly like tails, but ain't merged at
logical cluster boundaries, plus some other peculiar properties.

If compression is enabled, then in default mode management
will be passed to unix-file plugin with "notail" policy, as soon
as some heuristic detects, that file is incompressible. See
http://66.102.9.104/search?q=cache:TkVTWciE3F8J:www.namesys.com/cryptcompress_design.html
for details.

Edward.


>
>  >> Are there any plans to put it all up on Sourceforge or similar, with public
>  >> CVS access, mailing lists etc, so the user community can get more involved
>  >> in the project?
>  >
>
> > Flex still doesn't have a time to repair namesys.com
>
>
> Ah, so it will be back. Good to know. :-)
>
>  Many thanks for your help.
>
>  Gordan
>

Re: Reiser4 - extended attributes?

[Edward Shishkin]

Hello.
Xattrs are not yet supported in Reiser4.
Bartosz had a desire to devote some time for them, but I guess it is not 
yet ready.

Cc-ed the mailing list: maybe someone knows how to bypass xattrs
when implementing GlusterFS..

Thanks,
Edward.

gordan@bobich.net wrote:

> Hi,
>
> My apologies for bothering you again, but I couldn't find any reiser4 
> mailing lists to ask on.
>
> I'm trying to implement GlusterFS on top of Reiser4, and it is 
> complaining that the underlying FS (i.e. Reiser4) doesn't support 
> extended attributes. I have seen references to Reiser4 that say 
> otherwise, so I was wondering if there is a patch/fix that would make 
> the extended attributes work. I'm using the cc plugin with 
> compression. Is there a working implementation with extended 
> attributes? Or is my only option to move to a different underlying FS 
> type?
>
> Thanks.
>
> Gordan
>

Re: Reiser4 - extended attributes?

[Bartosz Szreder]

> Hello.
> Xattrs are not yet supported in Reiser4.
> Bartosz had a desire to devote some time for them, but I guess it is not
> yet ready.

Yes, they are far from being ready. I'm too lame to implement this
stuff in foreseeable future + I'm having some hard times trying to
earn a living and continue my education. I don't see any possibility
that I could _start_ (not even mention finishing) coding before June.

Regards,
Bartosz