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List:       qemu-devel
Subject:    Re: [Qemu-devel] [RFC PATCH 14/17] block: support FALLOC_FL_PUNCH_HOLE trimming
From:       Chris Wedgwood <cw () f00f ! org>
Date:       2012-03-09 8:20:41
Message-ID: 20120309082041.GA28158 () puku ! stupidest ! org
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> This will enable discard on more filesystems, including ext4.

i think this should default to off


for preallocated files this will punch holes all over the place and
reallocation will cause fragmentation (guests will free and reallocat
blocks normally)

xfs has a mechanism to convert to unwritten extents that would avoid
that, but it's not implemented in other filesystems


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