linux-ext4 - Re: [PATCH, RFC] ext4: add EXT4_IOC_ALLOC_DA

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Date:	Wed, 11 Mar 2009 17:41:05 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	linux-ext4@...r.kernel.org, aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [PATCH, RFC] ext4: add EXT4_IOC_ALLOC_DA_BLKS ioctl

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
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