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Message-ID: <2011735.1678290876@warthog.procyon.org.uk>
Date: Wed, 08 Mar 2023 15:54:36 +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>,
Linus Torvalds <torvalds@...ux-foundation.org>,
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 v16 03/13] overlayfs: Implement splice-read
Miklos Szeredi <miklos@...redi.hu> wrote:
> > + ret = -EINVAL;
> > + if (!real.file->f_op->splice_read)
> > + goto out_fdput;
> > +
> > + ret = rw_verify_area(READ, real.file, ppos, len);
> > + if (unlikely(ret < 0))
> > + goto out_fdput;
> > +
> > + old_cred = ovl_override_creds(file_inode(in)->i_sb);
> > + ret = real.file->f_op->splice_read(real.file, ppos, pipe, len, flags);
>
> I don't think you replied to my suggestion of using a helper here.
> E.g. it could be as simple as exporting do_splice_to(), or renaming it
> to vfs_splice_read() to be more readable. It would remove the
> boilerplate and be more robust if any changes are done to the splice
> reading code.
Using do_splice_to() as a helper is probably a good idea, though both Willy
and Christoph seem to dislike it.
The pipe occupancy check has already been done, so I'm not sure if it should
be repeated - though it probably wouldn't hurt.
David
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