linux-kernel - Re: [PATCH v14 097/138] iomap: Pass the iomap_page into iomap_set_range

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Date:   Fri, 16 Jul 2021 09:34:18 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v14 097/138] iomap: Pass the iomap_page into
 iomap_set_range_uptodate

On Fri, Jul 16, 2021 at 04:21:25AM +0100, Matthew Wilcox wrote:
> On Thu, Jul 15, 2021 at 02:21:05PM -0700, Darrick J. Wong wrote:
> > On Thu, Jul 15, 2021 at 04:36:23AM +0100, Matthew Wilcox (Oracle) wrote:
> > > All but one caller already has the iomap_page, and we can avoid getting
> > > it again.
> > > 
> > > Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> > 
> > Took me a while to distinguish iomap_iop_set_range_uptodate and
> > iomap_set_range_uptodate, but yes, this looks pretty simple.
> 
> Not my favourite naming, but it's a preexisting condition ;-)
> 
> Honestly I'd like to rename iomap to blkmap or something.
> And iomap_page is now hilariously badly named.  But that's kind
> of tangential to everything else here.

I guess we only use 'blkmap' in a few places in the kernel, and nobody's
going to confuse us with UFS.

Hmm, what kind of new name?

struct iomap_buffer_head *ibh;	/* NO */
struct iomap_folio_state *ifs;
struct iomap_state *is;		/* shorter, but what is 'state'? */
struct iomap_blkmap *ibm;	/* lolz */

I think iomap_blkmap sounds fine, since we're probably going to end up
exporting it (and therefore need a clear namespace) as soon as one of
the filesystems that uses page->private to stash per-page info wants to
use iomap for buffered io.

--D