How tell what version of reiserfs my filesystem is?

How tell what version of reiserfs my filesystem is?

[Nick Urbanik]

Dear team,

How do I tell whether each of my file systems is 3.5 or 3.6?

--
Nick Urbanik   RHCE                                  nicku@vtc.edu.hk
Dept. of Information & Communications Technology
Hong Kong Institute of Vocational Education (Tsing Yi)
Tel:   (852) 2436 8576, (852) 2436 8579          Fax: (852) 2436 8526
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Re: How tell what version of reiserfs my filesystem is?

[Oleg Drokin]

Hello!

On Wed, Apr 03, 2002 at 06:19:49PM +0800, Nick Urbanik wrote:

> How do I tell whether each of my file systems is 3.5 or 3.6?

If you run 2.2.x kernel, then you have reiserfs v3.5
If you have 2.[45].x kernel, then look it to the dmesg output
(or in the boot logs). If there is following message appears
after reiserfs mount messages: 'reiserfs: using 3.5.x disk format',
it means that filesystem is v3.5 format,
otherwise it is v3.6 format.

Also with recent 2.4 kernels (2.4.17+), you can lookup this info
in the /proc filesystem if you have enabled CONFIG_REISERFS_PROC_INFO.

Bye,
    Oleg

Re: How tell what version of reiserfs my filesystem is?

[Nick Urbanik]

Oleg Drokin wrote:

> > How do I tell whether each of my file systems is 3.5 or 3.6?
>
> If you run 2.2.x kernel, then you have reiserfs v3.5
> If you have 2.[45].x kernel, then look it to the dmesg output
> (or in the boot logs). If there is following message appears
> after reiserfs mount messages: 'reiserfs: using 3.5.x disk format',
> it means that filesystem is v3.5 format,
> otherwise it is v3.6 format.

So I must be using v3.6 format, though I created these file systems a
very long time ago, but with a 2.4.x kernel.

I have been using 2.4.19-pre5.  What does this mean in dmesg output:
Using r5 hash to sort names
ReiserFS version 3.6.25

> Also with recent 2.4 kernels (2.4.17+), you can lookup this info
> in the /proc filesystem if you have enabled CONFIG_REISERFS_PROC_INFO.

I had it off.
About CONFIG_REISERFS_PROC_INFO, Configure.help says: "This also
increases amount of kernel memory required for each mount."

By approximately how much does it do so?  For six large reiserfs file
systems?

Thank you, Oleg.

--
Nick Urbanik   RHCE                                  nicku@vtc.edu.hk
Dept. of Information & Communications Technology
Hong Kong Institute of Vocational Education (Tsing Yi)
Tel:   (852) 2436 8576, (852) 2436 8579          Fax: (852) 2436 8526
PGP: 53 B6 6D 73 52 EE 1F EE EC F8 21 98 45 1C 23 7B     ID: 7529555D
GPG: 7FFA CDC7 5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24   ID: BB9D2C24

Re: How tell what version of reiserfs my filesystem is?

[Oleg Drokin]

Hello!

On Thu, Apr 04, 2002 at 05:06:48AM +0800, Nick Urbanik wrote:

> I have been using 2.4.19-pre5.  What does this mean in dmesg output:
> Using r5 hash to sort names
> ReiserFS version 3.6.25

It means your filesystem is using r5 hash. Version information is obsolette and
will be removed soon.

> > Also with recent 2.4 kernels (2.4.17+), you can lookup this info
> > in the /proc filesystem if you have enabled CONFIG_REISERFS_PROC_INFO.
> I had it off.
> About CONFIG_REISERFS_PROC_INFO, Configure.help says: "This also
> increases amount of kernel memory required for each mount."
> By approximately how much does it do so?  For six large reiserfs file
> systems?

+8Kb of code (ie, common for no matter how much reiserfs fses you have)
plus ~440 bytes for each filesystem mounted for counters.

Of course there is little performance hit (cpu time eaten) to
actually increment these counters.

Bye,
    Oleg

Re: How tell what version of reiserfs my filesystem is?

[Nick Urbanik]

Oleg Drokin wrote:

> > > Also with recent 2.4 kernels (2.4.17+), you can lookup this info
> > > in the /proc filesystem if you have enabled CONFIG_REISERFS_PROC_INFO.
> > I had it off.
> > About CONFIG_REISERFS_PROC_INFO, Configure.help says: "This also
> > increases amount of kernel memory required for each mount."
> > By approximately how much does it do so?  For six large reiserfs file
> > systems?
>
> +8Kb of code (ie, common for no matter how much reiserfs fses you have)
> plus ~440 bytes for each filesystem mounted for counters.
>
> Of course there is little performance hit (cpu time eaten) to
> actually increment these counters.

I'll enable it in my future kernel builds.  Thank you again, Oleg.

--
Nick Urbanik   RHCE                                  nicku@vtc.edu.hk
Dept. of Information & Communications Technology
Hong Kong Institute of Vocational Education (Tsing Yi)
Tel:   (852) 2436 8576, (852) 2436 8579          Fax: (852) 2436 8526
PGP: 53 B6 6D 73 52 EE 1F EE EC F8 21 98 45 1C 23 7B     ID: 7529555D
GPG: 7FFA CDC7 5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24   ID: BB9D2C24

Re: How tell what version of reiserfs my filesystem is?

[Bernd Schubert]

Hello Oleg,

the kernel-config-help for this suggests not to enable unless you want to do 
reiserfs-debugging. But based on the data you provided, it doesn't hurt much 
on modern pc's to enable it at all. So perhaps you should also provide these 
data for the help text.

Best regards, 

Bernd

> +8Kb of code (ie, common for no matter how much reiserfs fses you have)
> plus ~440 bytes for each filesystem mounted for counters.
>
> Of course there is little performance hit (cpu time eaten) to
> actually increment these counters.
>
> Bye,
>     Oleg