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| From: | Paolo Bonzini |
| Subject: | Re: [Qemu-devel] [RFC PATCH 14/17] block: support FALLOC_FL_PUNCH_HOLE trimming |
| Date: | Fri, 09 Mar 2012 09:31:31 +0100 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 |
Il 09/03/2012 09:20, Chris Wedgwood ha scritto: > for preallocated files this will punch holes all over the place and > reallocation will cause fragmentation (guests will free and reallocat > blocks normally) SEEK_HOLE could provide a very simple heuristic to detect preallocated files (unfortunately ext4 does not implement SEEK_HOLE yet). > xfs has a mechanism to convert to unwritten extents that would avoid > that, but it's not implemented in other filesystems Interesting, thanks! Paolo
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