From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dave Chinner <david@fromorbit.com>,
Miklos Szeredi <miklos@szeredi.hu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: dcache shrink list corruption?
Date: Wed, 30 Apr 2014 00:20:13 +0100 [thread overview]
Message-ID: <20140429232013.GM18016@ZenIV.linux.org.uk> (raw)
In-Reply-To: <CA+55aFwcWcyRpwv3us9BbnsjUEfEr1mRjz4RWbcy_tSnZjc_Sw@mail.gmail.com>
On Tue, Apr 29, 2014 at 04:04:11PM -0700, Linus Torvalds wrote:
> But at a minimum, we have "d_op->d_prune()" that would now be possibly
> be called for the old dentry *after* a new dentry has been allocated.
> Not to mention the inode not having been dropped. So it looks like a
> disaster where the filesystem now ends up having concurrent "live"
> dentries for the same entry. Even if one of them is on its way out,
> it's still visible to the filesystem. That makes me very
> uncomfortable.
>
> I'm starting to think that Miklos' original patch (perhaps with the
> spinlock split to at least be one per superblock) is the most
> straightforward approach after all. It's annoying having to add locks
> here, but the whole pruning path should not be a hotpath, so maybe
> it's not actually a big deal.
FWIW, my solution is more or less working; I'll give more local beating
and post it...
next prev parent reply other threads:[~2014-04-29 23:20 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-29 16:01 dcache shrink list corruption? Miklos Szeredi
2014-04-29 17:43 ` Linus Torvalds
2014-04-29 18:03 ` Miklos Szeredi
2014-04-29 18:16 ` Al Viro
2014-04-29 19:10 ` Al Viro
2014-04-29 21:18 ` Dave Chinner
2014-04-29 21:48 ` Al Viro
2014-04-29 23:04 ` Linus Torvalds
2014-04-29 23:20 ` Al Viro [this message]
2014-04-30 2:31 ` Al Viro
2014-04-30 2:56 ` Linus Torvalds
2014-04-30 4:04 ` Al Viro
2014-04-30 15:49 ` Miklos Szeredi
2014-04-30 15:56 ` Miklos Szeredi
2014-04-30 16:03 ` Al Viro
2014-04-30 17:33 ` Miklos Szeredi
2014-04-30 18:36 ` Al Viro
2014-04-30 18:42 ` Miklos Szeredi
2014-04-30 19:02 ` Al Viro
2014-04-30 19:59 ` Al Viro
2014-04-30 20:23 ` Linus Torvalds
2014-04-30 20:38 ` Al Viro
2014-04-30 20:57 ` Linus Torvalds
2014-04-30 21:12 ` Al Viro
2014-04-30 22:12 ` Al Viro
2014-04-30 23:04 ` Linus Torvalds
2014-04-30 23:14 ` Linus Torvalds
2014-04-30 23:43 ` Al Viro
2014-05-01 0:18 ` Linus Torvalds
2014-05-01 2:51 ` Al Viro
2014-05-01 2:59 ` Linus Torvalds
2014-05-01 3:12 ` Al Viro
2014-05-01 9:42 ` Miklos Szeredi
2014-05-01 14:34 ` Al Viro
2014-05-01 21:02 ` Al Viro
2014-05-01 21:05 ` Al Viro
2014-05-01 22:52 ` Linus Torvalds
2014-05-02 8:43 ` Szeredi Miklos
2014-05-02 21:04 ` Linus Torvalds
2014-04-30 23:38 ` Al Viro
2014-04-30 9:15 ` Miklos Szeredi
2014-05-02 5:51 ` Al Viro
2014-05-02 9:00 ` Szeredi Miklos
2014-05-02 21:02 ` Miklos Szeredi
2014-05-02 21:08 ` Miklos Szeredi
2014-05-02 21:18 ` Linus Torvalds
2014-05-02 22:40 ` Al Viro
2014-05-02 23:06 ` Al Viro
2014-05-03 4:26 ` Al Viro
2014-05-03 18:07 ` Linus Torvalds
2014-05-03 18:25 ` Al Viro
2014-05-03 18:21 ` Al Viro
2014-05-04 6:29 ` Al Viro
2014-05-06 10:17 ` Miklos Szeredi
2014-05-06 14:53 ` Linus Torvalds
2014-05-06 16:52 ` Al Viro
2014-05-06 17:01 ` Linus Torvalds
2014-05-06 19:15 ` Al Viro
2014-05-02 22:32 ` Al Viro
2014-04-29 18:17 ` Linus Torvalds
2014-04-29 17:56 ` Al Viro
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