linux-kernel - Re: [PATCH 3/5] coda: use iterate_dir() in coda

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Message-ID: <8f2bf3aed5d7bd005adcdeaa51c02c7aa9ca14ba.camel@kernel.org>
Date: Mon, 09 Jun 2025 08:17:15 -0400
From: Jeff Layton <jlayton@...nel.org>
To: NeilBrown <neil@...wn.name>, Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner
	 <brauner@...nel.org>, Jan Kara <jack@...e.cz>, Chuck Lever
	 <chuck.lever@...cle.com>, Amir Goldstein <amir73il@...il.com>, Jan Harkes
	 <jaharkes@...cmu.edu>, David Howells <dhowells@...hat.com>, Tyler Hicks
	 <code@...icks.com>, Miklos Szeredi <miklos@...redi.hu>, Carlos Maiolino
	 <cem@...nel.org>
Cc: linux-fsdevel@...r.kernel.org, coda@...cmu.edu,
 codalist@...a.cs.cmu.edu, 	linux-nfs@...r.kernel.org,
 netfs@...ts.linux.dev, ecryptfs@...r.kernel.org, 
	linux-unionfs@...r.kernel.org, linux-xfs@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] coda: use iterate_dir() in coda_readdir()

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 notifications
> 
> 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.
> 
> Signed-off-by: NeilBrown <neil@...wn.name>
> ---
>  fs/coda/dir.c | 12 ++----------
>  1 file changed, 2 insertions(+), 10 deletions(-)
> 
> 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 = coda_ftoc(coda_file);
>  	host_file = cfi->cfi_container;
>  
> -	if (host_file->f_op->iterate_shared) {
> -		struct inode *host_inode = file_inode(host_file);
> -		ret = -ENOENT;
> -		if (!IS_DEADDIR(host_inode)) {
> -			inode_lock_shared(host_inode);
> -			ret = host_file->f_op->iterate_shared(host_file, ctx);
> -			file_accessed(host_file);
> -			inode_unlock_shared(host_inode);
> -		}
> +	ret = iterate_dir(host_file, ctx);
> +	if (ret != -ENOTDIR)
>  		return ret;
> -	}
>  	/* Venus: we must read Venus dirents from a file */
>  	return coda_venus_readdir(coda_file, ctx);
>  }


Is it already time for my annual ask of "Who the heck is using coda
these days?" Anyway, this patch looks fine to me.

Reviewed-by: Jeff Layton <jlayton@...nel.org>