linux-kernel - Re: [PATCH v14 05/17] overlayfs: Implement splice-read

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Message-ID: <3367219.1676473410@warthog.procyon.org.uk>
Date:   Wed, 15 Feb 2023 15:03:30 +0000
From:   David Howells <dhowells@...hat.com>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     dhowells@...hat.com, Jens Axboe <axboe@...nel.dk>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>,
        linux-unionfs@...r.kernel.org
Subject: Re: [PATCH v14 05/17] overlayfs: Implement splice-read

Miklos Szeredi <miklos@...redi.hu> wrote:

> > +       ret = -EINVAL;
> > +       if (in->f_flags & O_DIRECT &&
> > +           !(real.file->f_mode & FMODE_CAN_ODIRECT))
> > +               goto out_fdput;
> 
> This is unnecessary, as it was already done in ovl_real_fdget() ->
> ovl_real_fdget_meta() -> ovl_change_flags().

Does that mean ovl_read_iter() and ovl_write_iter() shouldn't be doing it,
then?

David