From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D34D1254AF0; Mon, 9 Jun 2025 13:21:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749475283; cv=none; b=fQGYSkhvW9YugAYTKEkufZqKmWzWL8qCA7bX93pDZnDaw2OKTI5rJYTGm+in96dCKqElmSZRg+xg4o1hduiDoYoj2vvsqijZqfHxrouuUd8199S6AcRp4Tizzb0qv2fy8yxd4LihgQ+Dag2rOnubOwV8Xr78TMTIB451f9ECXig= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749475283; c=relaxed/simple; bh=LGL6lMiRoy1C3r6cGW8Ct+d61FuhityEEXU/wWP08ZM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=GKsRyiGlyLn5mLko0PMbbIub5T7OelvduoOeq+3SOFhzmy1eFs5p3Z43TWJf0pVjBGqAjAjZj8w408Q5itAIhxKkgdwciwieSez5+fQlEjq2H4KDucycCxiC88xpPkKZAhSibb4LT2FsRoGbTpbHQ7fN/B4oWWBiwLHxoVuPhBg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Sc4jz1xX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Sc4jz1xX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F35AC4CEEB; Mon, 9 Jun 2025 13:21:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749475282; bh=LGL6lMiRoy1C3r6cGW8Ct+d61FuhityEEXU/wWP08ZM=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=Sc4jz1xXyP3jz5eQLV049uceTTx03om/OMqT7PN9vxR/wp5lrGX/VvAQI1GZxRpGu giKaa9j9QsOmIeTFlm71QV9BqE8Dvut67LbWPk3nAIIsSXwcDT63YMpwVR1ZUG++IK ge4CJIEwbDx5Q8cITBNhSQWnb7x6zs20FfcrYvQKOXjcUENmPxwnrN8K4t9OhVA0MJ YWYNQEurAMP0D3Vzig45u9nO9cl54wArsGXIWylZkBBWNLPrMDrN4LAwhK8Gq+exE9 OTpgsyGIfoxjmj++EG7fEpGWG0+prYra35kVaniQ65T/gAxDIr+FghqTliSmtMQV1d dFgzns762DF0Q== Message-ID: <33c80551bb7e0ac26ef00fe14aa9550df68ed120.camel@kernel.org> Subject: Re: [PATCH 3/5] coda: use iterate_dir() in coda_readdir() From: Jeff Layton To: Jan Harkes , Jan Kara Cc: NeilBrown , Alexander Viro , Christian Brauner , Chuck Lever , Amir Goldstein , David Howells , Tyler Hicks , Miklos Szeredi , Carlos Maiolino , linux-fsdevel@vger.kernel.org, coda@cs.cmu.edu, linux-nfs@vger.kernel.org, netfs@lists.linux.dev, ecryptfs@vger.kernel.org, linux-unionfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 09 Jun 2025 09:21:20 -0400 In-Reply-To: References: <20250608230952.20539-1-neil@brown.name> <20250608230952.20539-4-neil@brown.name> <8f2bf3aed5d7bd005adcdeaa51c02c7aa9ca14ba.camel@kernel.org> <6zirxkpkdrtpcoewopaaotmw4jpjvjmqq4tijudvrpeo4227pi@hyljuie6ngem> Autocrypt: addr=jlayton@kernel.org; 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text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2025-06-09 at 09:12 -0400, Jan Harkes wrote: > There are definitely still users of Coda at CMU, I don't track who else u= ses it, but it cannot be too many for sure. >=20 > At this point it mostly keeps you honest about little locking details in = the vfs. There are some tricky details in how the inode mappings are access= ed and such. I think that is helpful for overlay and user filesystems like= fuse, overlayfs, etc. but Coda is quite small so it is easy to reason abou= t how it uses these features. >=20 >=20 The reason I ask is that it's one of the places that we often have to do odd fixups like this when making changes to core VFS APIs. It's also not seen any non-collateral changes since 2021. I'm just wondering whether it's worth it to keep coda in-tree for so few users. IIRC, it's also the only fs in the kernel that changes its inode->i_mapping pointer after inode instantiation. If not for coda, we could probably replace the i_mapping pointer with some macro wizardry and shrink struct inode by 8 bytes. > On June 9, 2025 9:00:31 AM EDT, Jan Kara wrote: > > On Mon 09-06-25 08:17:15, Jeff Layton wrote: > > > On Mon, 2025-06-09 at 09:09 +1000, NeilBrown wrote: > > > > The code in coda_readdir() is nearly identical to iterate_dir(). > > > > Differences are: > > > > - iterate_dir() is killable > > > > - iterate_dir() adds permission checking and accessing notificatio= ns > > > >=20 > > > > I believe these are not harmful for coda so it is best to use > > > > iterate_dir() directly. This will allow locking changes without > > > > touching the code in coda. > > > >=20 > > > > Signed-off-by: NeilBrown > > > > --- > > > > fs/coda/dir.c | 12 ++---------- > > > > 1 file changed, 2 insertions(+), 10 deletions(-) > > > >=20 > > > > diff --git a/fs/coda/dir.c b/fs/coda/dir.c > > > > index ab69d8f0cec2..ca9990017265 100644 > > > > --- a/fs/coda/dir.c > > > > +++ b/fs/coda/dir.c > > > > @@ -429,17 +429,9 @@ static int coda_readdir(struct file *coda_file= , struct dir_context *ctx) > > > > cfi =3D coda_ftoc(coda_file); > > > > host_file =3D cfi->cfi_container; > > > > =20 > > > > - if (host_file->f_op->iterate_shared) { > > > > - struct inode *host_inode =3D file_inode(host_file); > > > > - ret =3D -ENOENT; > > > > - if (!IS_DEADDIR(host_inode)) { > > > > - inode_lock_shared(host_inode); > > > > - ret =3D host_file->f_op->iterate_shared(host_file, ctx); > > > > - file_accessed(host_file); > > > > - inode_unlock_shared(host_inode); > > > > - } > > > > + ret =3D iterate_dir(host_file, ctx); > > > > + if (ret !=3D -ENOTDIR) > > > > return ret; > > > > - } > > > > /* Venus: we must read Venus dirents from a file */ > > > > return coda_venus_readdir(coda_file, ctx); > > > > } > > >=20 > > >=20 > > > Is it already time for my annual ask of "Who the heck is using coda > > > these days?" Anyway, this patch looks fine to me. > > >=20 > > > Reviewed-by: Jeff Layton > >=20 > > Send a patch proposing deprecating it and we might learn that :) Search= ing > > the web seems to suggest it is indeed pretty close to dead. > >=20 > > Honza --=20 Jeff Layton