-------- Original Message --------
Subject: Re: [PATCH] btrfs: Return right extent when fiemap gives
unaligned offset and len.
From: David Sterba <dsterba@xxxxxxx>
To: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
Date: 2014年07月24日 20:17
On Fri, Jul 18, 2014 at 09:55:43AM +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 down which causes the
problem.
ALIGN rounds up, not down. So the wrong rounding will use incorrect start
(4096) and finds no extents if there's eg. only one [0,4095].
Sorry for the wrong description in patch.
Should I reword the patch and send a v2 patch?
Thanks,
Qu
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>
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