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From: Matthew Wilcox <willy@infradead.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Andreas Gruenbacher <agruenba@redhat.com>,
	"Darrick J. Wong" <djwong@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Joseph Qi <joseph.qi@linux.alibaba.com>,
	Liu Bo <bo.liu@linux.alibaba.com>,
	linux-fsdevel@vger.kernel.org,
	Gao Xiang <hsiangkao@linux.alibaba.com>,
	Liu Jiang <gerry@linux.alibaba.com>,
	linux-erofs@lists.ozlabs.org
Subject: Re: [PATCH 1/2] iomap: support tail packing inline read
Date: Fri, 16 Jul 2021 15:38:48 +0100	[thread overview]
Message-ID: <YPGZ+GE/Bb0zNhzD@casper.infradead.org> (raw)
In-Reply-To: <YPGN97vWokqkWSZn@casper.infradead.org>

On Fri, Jul 16, 2021 at 02:47:35PM +0100, Matthew Wilcox wrote:
> I think it looks something like this ...
> 
> @@ -211,23 +211,18 @@ struct iomap_readpage_ctx {
>  };
> 
>  static void iomap_read_inline_data(struct inode *inode, struct folio *folio,
> -               struct iomap *iomap)
> +               struct iomap *iomap, loff_t pos, size_t size)
>  {
> -       size_t size = i_size_read(inode);
>         void *addr;
> +       size_t offset = offset_in_folio(folio, pos);
> 
> -       if (folio_test_uptodate(folio))
> -               return;
> +       BUG_ON(size != i_size_read(inode) - pos);
> 
> -       BUG_ON(folio->index);
> -       BUG_ON(folio_multi(folio));
> -       BUG_ON(size > PAGE_SIZE - offset_in_page(iomap->inline_data));
> -
> -       addr = kmap_local_folio(folio, 0);
> +       addr = kmap_local_folio(folio, offset);
>         memcpy(addr, iomap->inline_data, size);
>         memset(addr + size, 0, PAGE_SIZE - size);
>         kunmap_local(addr);
> -       folio_mark_uptodate(folio);
> +       iomap_set_range_uptodate(folio, to_iomap_page(folio), pos, size);

That should be s/size/PAGE_SIZE - offset/
(because this has just zeroed all the bytes in the page after end-of-file)

  reply	other threads:[~2021-07-16 14:40 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-16  5:07 [PATCH 0/2] erofs: iomap support for tailpacking cases Gao Xiang
2021-07-16  5:07 ` [PATCH 1/2] iomap: support tail packing inline read Gao Xiang
2021-07-16  9:19   ` Christoph Hellwig
2021-07-16  9:46     ` Gao Xiang
2021-07-16 13:47     ` Matthew Wilcox
2021-07-16 14:38       ` Matthew Wilcox [this message]
2021-07-16 13:02   ` Matthew Wilcox
2021-07-16 13:56     ` Gao Xiang
2021-07-16 14:44       ` Matthew Wilcox
2021-07-16 15:03         ` Gao Xiang
2021-07-16 15:53           ` Andreas Grünbacher
2021-07-17 13:38             ` Gao Xiang
2021-07-17 15:01               ` Matthew Wilcox
2021-07-17 15:15                 ` Gao Xiang
2021-07-17 18:40                   ` Matthew Wilcox
2021-07-19 11:19                     ` Christoph Hellwig
2021-07-19 13:45                       ` Gao Xiang
2021-07-19 11:15               ` Christoph Hellwig
2021-07-19 13:31                 ` Gao Xiang
2021-07-16  5:07 ` [PATCH 2/2] erofs: convert all uncompressed cases to iomap Gao Xiang

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