[openbeosstorage] Re: session module

"Ingo Weinhold" <bonefish@xxxxxxxxxxxxxxx> wrote:
> > "Ingo Weinhold" <bonefish@xxxxxxxxxxxxxxx> wrote:
> > > > Right, that would be another good idea as long as we don't 
> > > > allow 
> > > > our 
> > > > users to resize partitions and move them around :-)
> > > > (which will be perfectly true for R1)
> > > Even then I see no problem, since the system would update the 
> > > data.
> > Of course, that would only be possible when the system knows about 
> > all 
> > the mount points to be updated.
> > If we don't have that global mount settings file, and the file 
> > system 
> > can't query reparse points, only the settings of mounted volumes 
> > could 
> > be updated.
> Mmh, I can't follow here. Since the actual partitioning is done in 
> kernel, it should know, which partitions are concerned, even, if they 
> aren't mounted. Or do I miss something=3D3F

I think so. What I was referring to was this: you have a reparse point 
that creates a point in /boot/home/mail. That reparse point is stored 
in the attributes of the real BFS directory /boot/home/mail, but it's 
not yet mounted, since the system had no reason to do so yet.
Now, you change the partition that this mount point referred to - if 
the reparse point has used the partition size/offset to identify the 
partition, the situation that I tried to explain above arises: the 
system doesn't necessarily know about the reparse point, and thus, it 
can't update it.
Clearer now=3F

BTW I think that only the real partition device should be used for 
those automatic reparse points - after all, that's the most secure 
value since the order and number of partitions rarely changes.
Of course, we could have a global table that maps unique IDs to 
partitions, and those can be updated automatically if anything changes. 
But this would also be problematic, if you wanted to use a permanent /
floppy/ kind of mount point (or in other words, for removable devices).

That's why I would say: screw that additional data for system 
maintained mount points, and only have /dev/disk/.../master/0=5F1 and the 
like as references.

Adios...
   Axel.

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