Re: [linux-lvm] Book chapter

[Joe Thornber <thornber@btconnect.com>]

On Fri, Jul 06, 2001 at 05:23:54PM -0300, Rik van Riel wrote:
> On Thu, 5 Jul 2001, Moshe Bar wrote:
> 
> > I am writing a chapter about LVM in my book. I would like to
> > know more about the internal data structures and the
> > algorithms used.
> >
> > Can you tell me more about them (next to what is in the
> > source code) or point me to some document about the
> > internals of LVM (interaction with VFS, etc.).
> 
> It's a block device layer thing, so it doesn't interact
> with the VFS. What the LVM layer _seems_ to do is simply
> remap an IO request to the device it's supposed to go to
> and let the request get into the IO layer again...

Rik's correct, LVM has nothing to do with the VFS.  If you wish to explore
the code start with lvm_map() which maps a buffer destined for a logical 
volume onto a physical device.
 
> (then again, I could be wrong here, the LVM code isn't
> the easiest to wade through)

Agreed.

- Joe