From: Christoph Hellwig <hch@infradead.org>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-block@vger.kernel.org
Subject: Re: [PATCH v15 01/17] block: Add bio_add_folio()
Date: Tue, 20 Jul 2021 07:42:00 +0100 [thread overview]
Message-ID: <YPZwODMq1ilIeS4t@infradead.org> (raw)
In-Reply-To: <20210719184001.1750630-2-willy@infradead.org>
On Mon, Jul 19, 2021 at 07:39:45PM +0100, Matthew Wilcox (Oracle) wrote:
> +/**
> + * bio_add_folio - Attempt to add part of a folio to a bio.
> + * @bio: Bio to add to.
> + * @folio: Folio to add.
> + * @len: How many bytes from the folio to add.
> + * @off: First byte in this folio to add.
> + *
> + * Always uses the head page of the folio in the bio. If a submitter only
> + * uses bio_add_folio(), it can count on never seeing tail pages in the
> + * completion routine. BIOs do not support folios that are 4GiB or larger.
> + *
> + * Return: The number of bytes from this folio added to the bio.
> + */
> +size_t bio_add_folio(struct bio *bio, struct folio *folio, size_t len,
> + size_t off)
> +{
> + if (len > UINT_MAX || off > UINT_MAX)
> + return 0;
> + return bio_add_page(bio, &folio->page, len, off);
> +}
I'd use the opportunity to switch to a true/false return instead of
the length. This has been on my todo list for bio_add_page for a while,
so it might make sense to start out the new API the right way.
next prev parent reply other threads:[~2021-07-20 6:43 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-19 18:39 [PATCH v15 00/17] Folio support in block + iomap layers Matthew Wilcox (Oracle)
2021-07-19 18:39 ` [PATCH v15 01/17] block: Add bio_add_folio() Matthew Wilcox (Oracle)
2021-07-20 1:28 ` Darrick J. Wong
2021-07-20 6:42 ` Christoph Hellwig [this message]
2021-07-20 11:16 ` Matthew Wilcox
2021-07-22 16:27 ` Matthew Wilcox
2021-07-30 8:25 ` Ming Lei
2021-07-30 11:30 ` Matthew Wilcox
2021-07-19 18:39 ` [PATCH v15 02/17] block: Add bio_for_each_folio_all() Matthew Wilcox (Oracle)
2021-07-20 1:29 ` Darrick J. Wong
2021-07-20 1:59 ` Matthew Wilcox
2021-07-20 6:48 ` Christoph Hellwig
2021-07-23 2:40 ` Matthew Wilcox
2021-07-20 12:05 ` kernel test robot
2021-07-20 12:05 ` kernel test robot
2021-07-20 12:26 ` kernel test robot
2021-07-19 18:39 ` [PATCH v15 03/17] iomap: Convert to_iomap_page to take a folio Matthew Wilcox (Oracle)
2021-07-20 6:49 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 04/17] iomap: Convert iomap_page_create " Matthew Wilcox (Oracle)
2021-07-20 6:50 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 05/17] iomap: Convert iomap_page_release " Matthew Wilcox (Oracle)
2021-07-20 6:52 ` Christoph Hellwig
2021-07-20 11:29 ` Matthew Wilcox
2021-07-20 11:40 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 06/17] iomap: Convert iomap_releasepage to use " Matthew Wilcox (Oracle)
2021-07-20 6:54 ` Christoph Hellwig
2021-07-20 23:56 ` Darrick J. Wong
2021-07-19 18:39 ` [PATCH v15 07/17] iomap: Convert iomap_invalidatepage " Matthew Wilcox (Oracle)
2021-07-20 6:55 ` Christoph Hellwig
2021-07-20 23:57 ` Darrick J. Wong
2021-07-19 18:39 ` [PATCH v15 08/17] iomap: Pass the iomap_page into iomap_set_range_uptodate Matthew Wilcox (Oracle)
2021-07-20 6:57 ` Christoph Hellwig
2021-07-20 11:36 ` Matthew Wilcox
2021-07-19 18:39 ` [PATCH v15 09/17] iomap: Use folio offsets instead of page offsets Matthew Wilcox (Oracle)
2021-07-20 6:59 ` Christoph Hellwig
2021-07-20 11:42 ` Matthew Wilcox
2021-07-19 18:39 ` [PATCH v15 10/17] iomap: Convert bio completions to use folios Matthew Wilcox (Oracle)
2021-07-20 7:08 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 11/17] iomap: Convert readahead and readpage to use a folio Matthew Wilcox (Oracle)
2021-07-20 7:09 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 12/17] iomap: Convert iomap_page_mkwrite " Matthew Wilcox (Oracle)
2021-07-20 7:13 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 13/17] iomap: Convert iomap_write_begin and iomap_write_end to folios Matthew Wilcox (Oracle)
2021-07-20 7:15 ` Christoph Hellwig
2021-07-20 23:59 ` Darrick J. Wong
2021-07-19 18:39 ` [PATCH v15 14/17] iomap: Convert iomap_read_inline_data to take a folio Matthew Wilcox (Oracle)
2021-07-20 7:16 ` Christoph Hellwig
2021-07-19 18:39 ` [PATCH v15 15/17] iomap: Convert iomap_write_end_inline " Matthew Wilcox (Oracle)
2021-07-20 7:17 ` Christoph Hellwig
2021-07-19 18:40 ` [PATCH v15 16/17] iomap: Convert iomap_add_to_ioend " Matthew Wilcox (Oracle)
2021-07-20 7:20 ` Christoph Hellwig
2021-07-20 11:45 ` Matthew Wilcox
2021-07-21 0:12 ` Darrick J. Wong
2021-07-21 4:27 ` Christoph Hellwig
2021-07-21 4:31 ` Matthew Wilcox
2021-07-21 15:28 ` Darrick J. Wong
2021-07-19 18:40 ` [PATCH v15 17/17] iomap: Convert iomap_migrate_page to use folios Matthew Wilcox (Oracle)
2021-07-20 7:21 ` Christoph Hellwig
2021-07-20 13:30 ` kernel test robot
2021-07-21 0:02 ` Darrick J. Wong
2021-07-20 8:44 ` [PATCH v15 00/17] Folio support in block + iomap layers Christoph Hellwig
2021-07-20 11:08 ` Matthew Wilcox
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