[Tux3] [PATCH 02/10] don't use preallocation if BUFFER_PARANOIA_DEBUG is defined

[Daniel Phillips]

On Sunday 19 October 2008 22:09, OGAWA Hirofumi wrote:
> >   - Buffer operations need to be adapted to work with page cache and
> >     bio instead of userspace synchronous Posix IO.
> 
> For now, I can't image what we want... BTW, do we support the blocksize
> smaller than PAGE_CACHE_SIZE?

Of course, and that will require some extra fiddling with the page cache
access code.

By coincidence, Tux3 University has lately been concentrating on exactly
the code we will be working with here.

> >   - Spinlocks for VFS ops
> 
> Um.. what does this mean?

Spinlocks are needed all over the place to serialize VFs operations
that would otherwise be racy with respect to Tux3 data structures.

> In future, how are we going to use the userland? I worry we are bothered
> to sync userland <-> kernel...

This gives us a very good start on a userspace based fsck and repair
tool.  There is no reason why we cannot include full access to the Tux3
filesystem from our repair/analysis tool.

I don't know if the fuse interface will have long term value, but it
certainly has value now and uses largely the same code we need for
userspace support tools, so it will not be much additional work to
continue to support it.

Regards,

Daniel

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