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SubjectRe: [GIT PATCH] TTY patches for 2.6.33-git


On Sun, 13 Dec 2009, Trond Myklebust wrote:
>
> The main remaining problem area is that of file locking (i.e. anything
> that references inode->i_flock). I've started work on that, but a couple
> of higher interrupts have prevented me from pulling it all together in
> time for this merge window...

I'm pretty sure we've had at least two trees with the file locking code
fixed, but NFS in a status of "unknown".

If I recall correctly, the file locking code itself is not that hard:
we've done it without the kernel lock in the past (long long ago), and the
lock usage doesn't nest (or at least it didn't at some point back then ;).
In fact, I think we even do the actual lock data structure allocations
outside of the kernel lock exactly because we at one time had a patch that
used a spinlock for protection of the lists.

(Again, not only my memory, but the code itself may have bitrotted in the
meantime, of course).

Linus


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