fsys_vector and dmapiops

[Aurelien Degremont - Stagiaire <degremont@xxxxxxxxxxx>]

Hello,

I'm trying to figure out the architecture and behaviour of the kernel 
part of DMAPI. Presently, I've got problems to understand the interface 
between DMAPI and the file systems.
I notice that 2 functions vectors are used : *fsys_vector* and *dmapiops*.
To get the fsys_vector structure, we need to use a function available in 
dmapiops.
Except few differences, they work as the same manner and they do the 
same job. They're filesystem's interface into the DMAPI code. In fact, I 
even don't understand why they got those differences. It must why I do 
not understand why two structures exist to do the same job. ;)
Could anybody explain to me how that stuff works ? :)

Aurelien