From: Alex Tomas <alex@clusterfs.com>
Subject: Re: booked-page-flag.patch
Date: Fri, 16 Feb 2007 10:56:55 +0300
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Cc: Alex Tomas <alex@clusterfs.com>, Eric Sandeen <sandeen@redhat.com>,
	"Theodore Ts'o" <tytso@mit.edu>,
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To: Andrew Morton <akpm@linux-foundation.org>
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In-Reply-To: <20070215234640.d52e5908.akpm@linux-foundation.org> (Andrew
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>>>>> Andrew Morton (AM) writes:

 AM> Well, one could just assume that the page has no disk mapping and go and
 AM> make the space reservation.  Things will work out OK when we come to do
 AM> writepage().

 AM> Or one could do both: call get_block() only if the page was inside i_size.

well, even so we need to reserve not that block ony, but
also needed metadata (for the worst case). probably this
is work for get_block or some different method? anyway,
we have to call it if the page is being written partial. 

thanks, Alex