linux-kernel - Re: [patch 1/3] fs: add an iovec iterator

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Date:	Fri, 9 Feb 2007 04:31:33 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Nate Diller <nate.diller@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Linux Filesystems <linux-fsdevel@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 1/3] fs: add an iovec iterator

On Thu, Feb 08, 2007 at 06:03:50PM -0800, Nate Diller wrote:
> On 2/8/07, Nick Piggin <npiggin@...e.de> wrote:
> >On Thu, Feb 08, 2007 at 07:49:53PM +0000, Christoph Hellwig wrote:
> >> On Thu, Feb 08, 2007 at 02:07:24PM +0100, Nick Piggin wrote:
> >> > Add an iterator data structure to operate over an iovec. Add usercopy
> >> > operators needed by generic_file_buffered_write, and convert that 
> >function
> >> > over.
> >>
> >> iovec_iterator is an awfully long and not very descriptive name.
> >> In past discussions we named this thingy iodesc and wanted to pass it
> >> down all the I/O path, including the file operations.
> >
> >Hi Christoph,
> >
> >Sure I think it would be a good idea to shorten the name. And yes, although
> >I just construct the iterator to pass into perform_write, I think it should
> >make sense to go much further up the call stack instead of passing all 
> >those
> >args around. iodesc seems like a fine name, so I'll use that unless
> >anyone objects.
> 
> i had a patch integrating the iodesc idea, but after some thought, had
> decided to call it struct file_io.  That name reflects the fact that
> it's doing I/O in arbitrary lengths with byte offsets, and struct
> file_io *fio contrasts well with struct bio (block_io).  I also had
> used the field ->nbytes instead of ->count, to clarify the difference
> between segment iterators, segment offsets, and absolute bytecount.

The field name is a good suggestion.

What I have there is not actually a full-blown file io descriptor, because
there is no file or offset. It is just an iovec iterator (so maybe I should
rename it to iov_iter, rather than iodesc). 

I think it might be a nice idea to keep this iov_iter as a standalone
structure, and it could be embedded into a struct file_io?

Thanks,
Nick
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