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From: "Darrick J. Wong" <djwong@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Andreas Gruenbacher <agruenba@redhat.com>,
	Shiyang Ruan <ruansy.fnst@fujitsu.com>,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-btrfs@vger.kernel.org, nvdimm@lists.linux.dev,
	cluster-devel@redhat.com
Subject: Re: [PATCH 17/27] iomap: switch iomap_seek_hole to use iomap_iter
Date: Mon, 26 Jul 2021 09:41:39 -0700	[thread overview]
Message-ID: <20210726164139.GS559212@magnolia> (raw)
In-Reply-To: <20210726082236.GE14853@lst.de>

On Mon, Jul 26, 2021 at 10:22:36AM +0200, Christoph Hellwig wrote:
> On Mon, Jul 19, 2021 at 10:22:47AM -0700, Darrick J. Wong wrote:
> > > -static loff_t
> > > -iomap_seek_hole_actor(struct inode *inode, loff_t start, loff_t length,
> > > -		      void *data, struct iomap *iomap, struct iomap *srcmap)
> > > +static loff_t iomap_seek_hole_iter(const struct iomap_iter *iter, loff_t *pos)
> > 
> > /me wonders if @pos should be named hole_pos (here and in the caller) to
> > make it a little easier to read...
> 
> Sure.
> 
> > ...because what we're really saying here is that if seek_hole_iter found
> > a hole (and returned zero, thereby terminating the loop before iter.len
> > could reach zero), we want to return the position of the hole.
> 
> Yes.
> 
> > > +	return size;
> > 
> > Not sure why we return size here...?  Oh, because there's an implicit
> > hole at EOF, so we return i_size.  Uh, does this do the right thing if
> > ->iomap_begin returns posteof mappings?  I don't see anything in
> > iomap_iter_advance that would stop iteration at EOF.
> 
> Nothing in ->iomap_begin checks that, iomap_seek_hole initializes
> iter.len so that it stops at EOF.

Oh, right.  Sorry, I forgot that. :(

--D

  reply	other threads:[~2021-07-26 16:41 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 10:34 RFC: switch iomap to an iterator model Christoph Hellwig
2021-07-19 10:34 ` [PATCH 01/27] iomap: fix a trivial comment typo in trace.h Christoph Hellwig
2021-07-19 16:00   ` Darrick J. Wong
2021-07-19 10:34 ` [PATCH 02/27] iomap: remove the iomap arguments to ->page_{prepare,done} Christoph Hellwig
2021-07-19 16:04   ` Darrick J. Wong
2021-07-19 10:34 ` [PATCH 03/27] iomap: mark the iomap argument to iomap_sector const Christoph Hellwig
2021-07-19 16:08   ` Darrick J. Wong
2021-07-20  9:52     ` Nikolay Borisov
2021-07-26  8:12     ` Christoph Hellwig
2021-07-19 10:34 ` [PATCH 04/27] fs: mark the iomap argument to __block_write_begin_int const Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:34 ` [PATCH 05/27] fsdax: mark the iomap argument to dax_iomap_sector as const Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:34 ` [PATCH 06/27] iomap: mark the iomap argument to iomap_read_inline_data const Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 07/27] iomap: mark the iomap argument to iomap_read_page_sync const Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 08/27] iomap: add the new iomap_iter model Christoph Hellwig
2021-07-19 16:56   ` Darrick J. Wong
2021-07-26  8:15     ` Christoph Hellwig
2021-07-19 21:48   ` Dave Chinner
2021-07-26  8:17     ` Christoph Hellwig
2021-07-19 10:35 ` [PATCH 09/27] iomap: switch readahead and readpage to use iomap_iter Christoph Hellwig
2021-07-19 10:35 ` [PATCH 10/27] iomap: switch iomap_file_buffered_write " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 11/27] iomap: switch iomap_file_unshare " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 12/27] iomap: switch iomap_zero_range " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 13/27] iomap: switch iomap_page_mkwrite " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 14/27] iomap: switch __iomap_dio_rw " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 15/27] iomap: switch iomap_fiemap " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 16/27] iomap: switch iomap_bmap " Christoph Hellwig
2021-07-19 17:05   ` Darrick J. Wong
2021-07-26  8:19     ` Christoph Hellwig
2021-07-26 16:39       ` Darrick J. Wong
2021-07-27  6:31         ` Christoph Hellwig
2021-07-27 14:32           ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 17/27] iomap: switch iomap_seek_hole " Christoph Hellwig
2021-07-19 17:22   ` Darrick J. Wong
2021-07-26  8:22     ` Christoph Hellwig
2021-07-26 16:41       ` Darrick J. Wong [this message]
2021-07-19 10:35 ` [PATCH 18/27] iomap: switch iomap_seek_data " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 19/27] iomap: switch iomap_swapfile_activate " Christoph Hellwig
2021-07-19 10:35 ` [PATCH 20/27] fsdax: switch dax_iomap_rw " Christoph Hellwig
2021-07-19 22:10   ` Dave Chinner
2021-07-26  8:25     ` Christoph Hellwig
2021-07-19 10:35 ` [PATCH 21/27] iomap: remove iomap_apply Christoph Hellwig
2021-07-19 17:48   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 22/27] iomap: pass an iomap_iter to various buffered I/O helpers Christoph Hellwig
2021-07-19 17:48   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 23/27] iomap: rework unshare flag Christoph Hellwig
2021-07-19 17:44   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 24/27] fsdax: factor out helpers to simplify the dax fault code Christoph Hellwig
2021-07-19 10:35 ` [PATCH 25/27] fsdax: factor out a dax_fault_actor() helper Christoph Hellwig
2021-07-19 10:35 ` [PATCH 26/27] fsdax: switch the fault handlers to use iomap_iter Christoph Hellwig
2021-07-19 17:35   ` Darrick J. Wong
2021-07-19 10:35 ` [PATCH 27/27] iomap: constify iomap_iter_srcmap Christoph Hellwig
2021-07-19 17:44   ` Darrick J. Wong
2021-07-19 17:57 ` RFC: switch iomap to an iterator model Darrick J. Wong
2021-07-27  8:07   ` DAX setup pains, was " Christoph Hellwig
2021-07-29 20:33 ` Darrick J. Wong

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