Re: [PATCH v2] btrfs: Return right extent when fiemap gives unaligned offset and len.

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On Fri, Jul 25, 2014 at 09:49:03AM +0800, Qu Wenruo wrote:
> When page aligned start and len passed to extent_fiemap(), the result is
> good, but when start and len is not aligned, e.g. start = 1 and len =
> 4095 is passed to extent_fiemap(), it returns no extent.
> 
> The problem is that start and len is all rounded up which causes the
> problem. This patch will round down start and round up (start + len) to
> return right extent.
> 
> Reported-by: Chandan Rajendra <chandan@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>

Reviewed-by: David Sterba <dsterba@xxxxxxx>

> ---
> changelog:
> v2: reword the description(ALIGN rounds up, not rounds down).

JFYI, if you're just rewording the changelog, you can keep the
reviewed-by tags.
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