linux-kernel - Re: [PATCH 1/6 v7] vfs: add i

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Message-ID: <AANLkTikQt9JRp4jx9qcTEr6nKMppA8Gj3=E12aFUGUYs@mail.gmail.com>
Date:	Tue, 22 Mar 2011 10:18:59 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	apw@...onical.com, nbd@...nwrt.org, neilb@...e.de
Subject: Re: [PATCH 1/6 v7] vfs: add i_op->open()

On Tue, Mar 22, 2011 at 8:26 AM, Miklos Szeredi <miklos@...redi.hu> wrote:
>
> Add a new inode operation i_op->open().  This is for stacked
> filesystems that want to return a struct file from a different
> filesystem.

Hmm..

> +               struct inode *inode = nd->path.dentry->d_inode;
> +
> +               if (inode->i_op->open) {
> +                       int flags = filp->f_flags;
> +                       put_filp(filp);
> +                       filp = inode->i_op->open(nd->path.dentry, flags, cred);
> +               } else {
> +                       filp = __dentry_open(&nd->path, filp, NULL, cred);
> +               }

This seems broken.

Why don't you just pass in the filp to the ->open routine, and drop
that "flags" argument. Maybe other filesystems want to use ->open, but
don't want to put_filp() on the filp we already allocated, only to
allocate a new one?

It seems like you made that unnecessarily hard on purpose, with no
advantage to the interface.

                        Linus
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