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 <redacted>
Signed-off-by: Qu Wenruo <redacted>

Reviewed-by: David Sterba <redacted>

---
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.