linux-kernel - Re: Hang/soft lockup in d_invalidate with simultaneous calls

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Message-ID: <CACGdZY+Yy+tfTHV_dDT86H_F9E17OgwM9xU8s-rk0+fAio7rFg@mail.gmail.com>
Date:   Fri, 2 Jun 2017 23:47:27 -0700
From:   Khazhismel Kumykov <khazhy@...gle.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: Re: Hang/soft lockup in d_invalidate with simultaneous calls

On Fri, Jun 2, 2017 at 11:20 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> The thing is, unlike shrink_dcache_parent() we *can* bugger off as
> soon as we'd found no victims, nothing mounted and dentry itself
> is unhashed.  We can't do anything in select_collect() (we would've
> broken shrink_dcache_parent() that way), but we can do unhashing
> in check_and_drop() in "really nothing to do" case and we can return
> from d_invalidate() after that.  So how about this:
That does the trick.

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