|
From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [RFC PATCH 14/17] block: support FALLOC_FL_PUNCH_HOLE trimming |
Date: | Fri, 09 Mar 2012 09:40:46 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 |
Il 09/03/2012 09:35, Chris Wedgwood ha scritto: >> 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. FIEMAP is a powertool, we need a butter knife only (cit.). > Simplest still compare the blocks allocated by the file > to it's length (ie. stat.st_blocks != stat.st_size>>9). But yes, you're right about this. Paolo
[Prev in Thread] | Current Thread | [Next in Thread] |