Re: file system block size

[Badari Pulavarty <pbadari@gmail.com>]

On Tue, 2005-10-18 at 11:12 -0400, Bob Copeland wrote:
> > Indeed, it makes everything harder.  Have a look at ntfs in the kernel
> > which has to cope with file system block sizes between 512 bytes and
> > several hundred kiB (at least they are in powers of two thank
> > goodness...).  You end up not being able to use a lot of generic
> > functions as you for example need to lock multiple pages which needs to
> > be ordered correctly, etc...  If you look at the latest -mm kernel, the
> > ntfs driver there has file write(2) support for any cluster size and you
> > will see an example of the multiple page locking problem solution there.
> 
> Any chance this will make it into common code?  I also need it for my
> filesystem driver (here: http://bobcopeland.com/karma/).  So far I've
> only done read side which is not too bad, but as you say writing makes
> things complicated.
> 
> That, and the extent-supporting mpage_readpages would make me a happy person.

Can you elaborate ? What would you like to see in mpage_readpages() ?
Christoph recently posted patches to add support for getblocks() in
mpage_readpages().  What else do you need ?


Thanks,
Badari