From: David Sterba <dsterba@suse.cz>
To: Qu Wenruo <quwenruo@cn.fujitsu.com>
Cc: dsterba@suse.cz, linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] btrfs: Return right extent when fiemap gives unaligned offset and len.
Date: Tue, 29 Jul 2014 14:30:45 +0200 [thread overview]
Message-ID: <20140729123045.GQ1553@twin.jikos.cz> (raw)
In-Reply-To: <53D1B2E1.60008@cn.fujitsu.com>
On Fri, Jul 25, 2014 at 09:29:05AM +0800, Qu Wenruo wrote:
>
> -------- Original Message --------
> Subject: Re: [PATCH] btrfs: Return right extent when fiemap gives unaligned
> offset and len.
> From: David Sterba <dsterba@suse.cz>
> To: Qu Wenruo <quwenruo@cn.fujitsu.com>
> 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?
You already did, but yes please.
prev parent reply other threads:[~2014-07-29 12:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-18 1:55 [PATCH] btrfs: Return right extent when fiemap gives unaligned offset and len Qu Wenruo
2014-07-24 12:17 ` David Sterba
2014-07-25 1:29 ` Qu Wenruo
2014-07-29 12:30 ` David Sterba [this message]
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