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From: | Chris Wedgwood |
Subject: | Re: [Qemu-devel] [RFC PATCH 14/17] block: support FALLOC_FL_PUNCH_HOLE trimming |
Date: | Fri, 9 Mar 2012 00:35:39 -0800 |
> SEEK_HOLE could provide a very simple heuristic to detect preallocated > files (unfortunately ext4 does not implement SEEK_HOLE yet). SEEK_HOLE is a weird (confusing and no intuitive) API (IMO). There is FIEMAP or whatever it's called which seems somewhat saner. XFS specific there is also GETBMAP[X]. Simplest still compare the blocks allocated by the file to it's length (ie. stat.st_blocks != stat.st_size>>9).
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