Re: new special filesystem for consideration in 2.6/2.7

[Steve Longerbeam]

Pavel Machek wrote:

> Hi!
>
>  
>
> > (PRAMFS). It was originally developed for three major consumer
> > electronics companies for use in their smart cell phones
> > and other consumer devices.
> >
> > An intro to PRAMFS along with a technical specification
> > is at the SourceForge project web page at
> > http://pramfs.sourceforge.net/. A patch for 2.6.3 has
> > been released at the SF project site.
> >    
>
> Well, I'd certainly love to see some usable linux cell phones. 
> (Well, one such beast in my pocket would probably be enough :-)
> (Is there a way to make linux cell phone without second
> cpu just for GSM stack?)

one of the chips used in their cell phones is the TI OMAP1510.
It has an embedded TMS320c55 DSP as well as an ARM 925.

> Comments about pramfs: RAM is not really random access,
> you'll find that doing byte-sized random reads is way slower
> than linear read,
> but you are right that it is very different from disk.
>
>
> How do you handle powerfail in the middle of write?

good question, I don't - not in software anyway. But the companies
I mentioned may have implemented some kind of h/w safe shutdown,
but I'm not sure.

> Do you run fsck or do you have some kind of logging?

If you mean journaling, no, pramfs is not a journaling fs.

And you're right, I still need to write an fsck for pramfs.
At this point there is no way to recover a corrupt fs.

Steve


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