linux-kernel - Re: [PATCH 6/8] dcache: use lockref_init for d

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Message-ID: <20250115203024.GB1977892@ZenIV>
Date: Wed, 15 Jan 2025 20:30:24 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Dave Chinner <david@...morbit.com>
Cc: Christoph Hellwig <hch@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>,
	Gao Xiang <xiang@...nel.org>, Chao Yu <chao@...nel.org>,
	Andreas Gruenbacher <agruenba@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-erofs@...ts.ozlabs.org, gfs2@...ts.linux.dev
Subject: Re: [PATCH 6/8] dcache: use lockref_init for d_lockref

On Thu, Jan 16, 2025 at 07:13:23AM +1100, Dave Chinner wrote:
> On Wed, Jan 15, 2025 at 10:46:42AM +0100, Christoph Hellwig wrote:
> > Signed-off-by: Christoph Hellwig <hch@....de>
> > ---
> >  fs/dcache.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/fs/dcache.c b/fs/dcache.c
> > index b4d5e9e1e43d..1a01d7a6a7a9 100644
> > --- a/fs/dcache.c
> > +++ b/fs/dcache.c
> > @@ -1681,9 +1681,8 @@ static struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name)
> >  	/* Make sure we always see the terminating NUL character */
> >  	smp_store_release(&dentry->d_name.name, dname); /* ^^^ */
> >  
> > -	dentry->d_lockref.count = 1;
> >  	dentry->d_flags = 0;
> > -	spin_lock_init(&dentry->d_lock);
> 
> Looks wrong -  dentry->d_lock is not part of dentry->d_lockref...

include/linux/dcache.h:80:#define d_lock  d_lockref.lock