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Re: [Qemu-devel] libvirt/qemu fallocate flags


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] libvirt/qemu fallocate flags
Date: Mon, 22 Feb 2016 19:16:08 +0000
User-agent: Mutt/1.5.24 (2015-08-30)

On Fri, Feb 19, 2016 at 07:08:30AM -0500, Krutika Dhananjay wrote:
> I work on the GlusterFS project and we are using glusterfs as the backend 
> store 
> for VM images in our testing. There's a new feature introduced in glusterfs 
> which 
> shards a large file into multiple files. 
> 
> Now in order to implement the "fallocate" file operation for sharded files, 
> we need 
> to know all the possible flags (ex: FALLOC_FL_KEEP_SIZE) that are passed to 
> qemu when calling fallocate(). Could you help us on this? 

cd qemu && git grep 'fallocate('

The following are used by block/raw-posix.c:

FALLOC_FL_ZERO_RANGE,

FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,

and 0.

Stefan

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