linux-ext4 - Re: [PATCH 1/3] fs: Introduce new flag FALLOC_FL_COLLAPSE

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Date:	Wed, 31 Jul 2013 18:01:54 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	adilger.kernel@...ger.ca, bpm@....com, elder@...nel.org,
	hch@...radead.org, david@...morbit.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, xfs@....sgi.com, a.sangwan@...sung.com,
	Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH 1/3] fs: Introduce new flag FALLOC_FL_COLLAPSE_RANGE

Have you considered what happens if you have a 10 megabyte file, of
which the first 5 megs are mmap'ed into a userspace process.

Now suppose you call COLLAPASE_RANGE on a one megabyte range starting
at offset 1024k from the beginning of the file.

Does the right thing happen to the mmap'ed region in memory?

Cheers,

					- Ted
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