linux-kernel - Re: [PATCH] fs/compat_ioctl.c: add missing FS_IOC

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Date:	Sat, 01 Aug 2009 11:17:13 -0400
From:	Mark Lord <lkml@....ca>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] fs/compat_ioctl.c: add missing FS_IOC_FIEMAP support

Mark Lord wrote:
..
> Since FIBMAP itself is b0rked on ext4, this leaves no way for a 32-bit
..

To stave off the inevitable question, FIBMAP doesn't appear to cope well
with allocated/uncommitted blocks.  Creating a file with fallocate(),
and then immediately running FIBMAP, will not give any allocation data.

Doing a sync() after the fallocate() allows FIBMAP to work again.

FIEMAP doesn't require the sync().

Cheers
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