From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Sandeen <sandeen@redhat.com>
Subject: Re: [PATCH, RFC] ext4: add EXT4_IOC_ALLOC_DA_BLKS ioctl
Date: Wed, 11 Mar 2009 17:41:05 -0500
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Cc: linux-ext4@vger.kernel.org, aneesh.kumar@linux.vnet.ibm.com
To: "Theodore Ts'o" <tytso@mit.edu>
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Theodore Ts'o wrote:
> Add an ioctl which forces all of the delay allocated blocks to be
> allocated.  This also provides a function ext4_alloc_da_blocks() which
> will be used by the following commits to force files to be fully
> allocated to preserve application-expected ext3 behaviour.
> 

Is it worth checking whether a) the file has delalloc blocks, and/or b)
whether the mapping is dirty before we spin off a filemap_flush?

-Eric