From: "Darrick J. Wong" <djwong@kernel.org>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v2 20/28] iomap: Convert iomap_write_begin() and iomap_write_end() to folios
Date: Tue, 16 Nov 2021 20:31:27 -0800 [thread overview]
Message-ID: <20211117043127.GK24307@magnolia> (raw)
In-Reply-To: <20211108040551.1942823-21-willy@infradead.org>
On Mon, Nov 08, 2021 at 04:05:43AM +0000, Matthew Wilcox (Oracle) wrote:
> These functions still only work in PAGE_SIZE chunks, but there are
> fewer conversions from tail to head pages as a result of this patch.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> ---
> fs/iomap/buffered-io.c | 66 ++++++++++++++++++++----------------------
> 1 file changed, 31 insertions(+), 35 deletions(-)
>
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 9c61d12028ca..f4ae200adc4c 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
<snip>
> @@ -741,6 +737,7 @@ static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
> long status = 0;
>
> do {
> + struct folio *folio;
> struct page *page;
> unsigned long offset; /* Offset into pagecache page */
> unsigned long bytes; /* Bytes to write to page */
> @@ -764,16 +761,17 @@ static loff_t iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i)
> break;
> }
>
> - status = iomap_write_begin(iter, pos, bytes, &page);
> + status = iomap_write_begin(iter, pos, bytes, &folio);
> if (unlikely(status))
> break;
>
> + page = folio_file_page(folio, pos >> PAGE_SHIFT);
> if (mapping_writably_mapped(iter->inode->i_mapping))
> flush_dcache_page(page);
>
> copied = copy_page_from_iter_atomic(page, offset, bytes, i);
Hrmm. In principle (or I guess even a subsequent patch), if we had
multi-page folios, could we simply loop the pages in the folio instead
of doing a single page and then calling back into iomap_write_begin to
get (probably) the same folio?
This looks like a fairly straightforward conversion, but I was wondering
about that one little point...
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
--D
>
> - status = iomap_write_end(iter, pos, bytes, copied, page);
> + status = iomap_write_end(iter, pos, bytes, copied, folio);
>
> if (unlikely(copied != status))
> iov_iter_revert(i, copied - status);
> @@ -839,13 +837,13 @@ static loff_t iomap_unshare_iter(struct iomap_iter *iter)
> do {
> unsigned long offset = offset_in_page(pos);
> unsigned long bytes = min_t(loff_t, PAGE_SIZE - offset, length);
> - struct page *page;
> + struct folio *folio;
>
> - status = iomap_write_begin(iter, pos, bytes, &page);
> + status = iomap_write_begin(iter, pos, bytes, &folio);
> if (unlikely(status))
> return status;
>
> - status = iomap_write_end(iter, pos, bytes, bytes, page);
> + status = iomap_write_end(iter, pos, bytes, bytes, folio);
> if (WARN_ON_ONCE(status == 0))
> return -EIO;
>
> @@ -882,21 +880,19 @@ EXPORT_SYMBOL_GPL(iomap_file_unshare);
> static s64 __iomap_zero_iter(struct iomap_iter *iter, loff_t pos, u64 length)
> {
> struct folio *folio;
> - struct page *page;
> int status;
> size_t offset, bytes;
>
> - status = iomap_write_begin(iter, pos, length, &page);
> + status = iomap_write_begin(iter, pos, length, &folio);
> if (status)
> return status;
> - folio = page_folio(page);
>
> offset = offset_in_folio(folio, pos);
> bytes = min_t(u64, folio_size(folio) - offset, length);
> folio_zero_range(folio, offset, bytes);
> folio_mark_accessed(folio);
>
> - return iomap_write_end(iter, pos, bytes, bytes, page);
> + return iomap_write_end(iter, pos, bytes, bytes, folio);
> }
>
> static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
> --
> 2.33.0
>
next prev parent reply other threads:[~2021-11-17 4:31 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-08 4:05 [PATCH v2 00/28] iomap/xfs folio patches Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 01/28] csky,sparc: Declare flush_dcache_folio() Matthew Wilcox (Oracle)
2021-11-09 8:36 ` Christoph Hellwig
2021-11-15 15:54 ` Matthew Wilcox
2021-11-16 6:33 ` Christoph Hellwig
2021-11-16 21:49 ` Matthew Wilcox
2021-11-17 9:52 ` Geert Uytterhoeven
2021-11-08 4:05 ` [PATCH v2 02/28] mm: Add functions to zero portions of a folio Matthew Wilcox (Oracle)
2021-11-09 8:40 ` Christoph Hellwig
2021-11-17 4:45 ` Darrick J. Wong
2021-11-17 14:07 ` Matthew Wilcox
2021-11-17 17:07 ` Darrick J. Wong
2021-11-18 15:55 ` Matthew Wilcox
2021-11-18 17:26 ` Darrick J. Wong
2021-11-18 20:08 ` Matthew Wilcox
2021-11-08 4:05 ` [PATCH v2 03/28] fs: Remove FS_THP_SUPPORT Matthew Wilcox (Oracle)
2021-11-17 4:36 ` Darrick J. Wong
2021-11-08 4:05 ` [PATCH v2 04/28] fs: Rename AS_THP_SUPPORT and mapping_thp_support Matthew Wilcox (Oracle)
2021-11-09 8:41 ` Christoph Hellwig
2021-11-15 16:03 ` Matthew Wilcox
2021-11-16 6:33 ` Christoph Hellwig
2021-11-08 4:05 ` [PATCH v2 05/28] block: Add bio_add_folio() Matthew Wilcox (Oracle)
2021-11-17 4:48 ` Darrick J. Wong
2021-11-08 4:05 ` [PATCH v2 06/28] block: Add bio_for_each_folio_all() Matthew Wilcox (Oracle)
2021-11-17 4:48 ` Darrick J. Wong
2021-11-08 4:05 ` [PATCH v2 07/28] fs/buffer: Convert __block_write_begin_int() to take a folio Matthew Wilcox (Oracle)
2021-11-09 8:42 ` Christoph Hellwig
2021-11-17 4:35 ` Darrick J. Wong
2021-11-08 4:05 ` [PATCH v2 08/28] iomap: Convert to_iomap_page " Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 09/28] iomap: Convert iomap_page_create " Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 10/28] iomap: Convert iomap_page_release " Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 11/28] iomap: Convert iomap_releasepage to use " Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 12/28] iomap: Add iomap_invalidate_folio Matthew Wilcox (Oracle)
2021-11-17 2:20 ` Darrick J. Wong
2021-11-08 4:05 ` [PATCH v2 13/28] iomap: Pass the iomap_page into iomap_set_range_uptodate Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 14/28] iomap: Convert bio completions to use folios Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 15/28] iomap: Use folio offsets instead of page offsets Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 16/28] iomap: Convert iomap_read_inline_data to take a folio Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 17/28] iomap: Convert readahead and readpage to use " Matthew Wilcox (Oracle)
2021-11-09 8:43 ` Christoph Hellwig
2021-11-08 4:05 ` [PATCH v2 18/28] iomap: Convert iomap_page_mkwrite " Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 19/28] iomap: Convert __iomap_zero_iter " Matthew Wilcox (Oracle)
2021-11-09 8:47 ` Christoph Hellwig
2021-11-17 2:24 ` Darrick J. Wong
2021-11-17 14:20 ` Matthew Wilcox
2021-12-09 21:38 ` Matthew Wilcox
2021-12-10 16:19 ` Matthew Wilcox
2021-12-13 7:34 ` Christoph Hellwig
2021-12-13 18:08 ` Matthew Wilcox
2021-12-16 19:36 ` Darrick J. Wong
2021-12-16 20:43 ` Matthew Wilcox
2021-11-08 4:05 ` [PATCH v2 20/28] iomap: Convert iomap_write_begin() and iomap_write_end() to folios Matthew Wilcox (Oracle)
2021-11-17 4:31 ` Darrick J. Wong [this message]
2021-11-17 14:31 ` Matthew Wilcox
2021-11-17 17:10 ` Darrick J. Wong
2021-11-08 4:05 ` [PATCH v2 21/28] iomap: Convert iomap_write_end_inline to take a folio Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 22/28] iomap,xfs: Convert ->discard_page to ->discard_folio Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 23/28] iomap: Simplify iomap_writepage_map() Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 24/28] iomap: Simplify iomap_do_writepage() Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 25/28] iomap: Convert iomap_add_to_ioend() to take a folio Matthew Wilcox (Oracle)
2021-11-17 4:34 ` Darrick J. Wong
2021-11-08 4:05 ` [PATCH v2 26/28] iomap: Convert iomap_migrate_page() to use folios Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 27/28] iomap: Support multi-page folios in invalidatepage Matthew Wilcox (Oracle)
2021-11-08 4:05 ` [PATCH v2 28/28] xfs: Support multi-page folios Matthew Wilcox (Oracle)
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