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

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Date:	Tue, 22 Mar 2011 19:12:44 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	miklos@...redi.hu, 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, 22 Mar 2011, Linus Torvalds wrote:
> > +               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?

Maybe, although I don't see the reason to do that.  Why keep the
original one?  It doesn't contain any information besides the flags
and the dentry/vfsmount.

Thanks,
Miklos
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