Re: [GIT PULL] please pull file-locking related changes for v3.20
From: Jeff Layton
Date: Mon Feb 16 2015 - 19:35:47 EST
On Mon, 16 Feb 2015 16:21:30 -0800
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Mon, Feb 16, 2015 at 4:02 PM, Jeff Layton <jlayton@xxxxxxxxxxxxxxx> wrote:
> > Now that I look, it may be best to just revert this whole set for now.
> > Linus, are you amenable to doing that?
> Sure. But I'd prefer seeing how hard it would be to fix things first.
> If this was at the end of the release cycle, I'd revert it
> immediately. As it is, try to see how had it is.
Fair enough. I just didn't want to hold up -rc1. I should be able to
fix up the bugs within the next day or so.
I've got a small stack of fixes that I'll send along soon.
> The bugs I found might be as easy as just the attached (TOTALLY
> UNTESTED) patch. The comment about a higher-priority process and
> sched_resced() is just complete and utter crap. If somebody holds a
> read lock and upgrades it to a write lock, there is absolutely *zero*
> reason to let some higher-priority process get the write-lock first -
> that's just simply semantically wrong bullshit. "Higher priority" does
> not mean "can punch through locks".
The patch is pretty close to one that I have, so yes I think that will fix
it. There is one bug in the first loop though -- "old_fl" should be set
to "fl" there.
I'm also happy to remove the "drop the spinlock" thing. It's bothered
me for a while...
> Removing the silly incorrect counts should be trivial too. There
> really are not very many users, and they can just walk the list
Yes, that's a straightforward revert.
> Now, if you've found other more fundamental bugs that look unfixable,
> then that might mean that reverting it all is unavoidable, but..
No, I don't think there's anything unfixable there. I did find another
bug, but it's simple to fix.
Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
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