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Re: [Qemu-devel] [PATCH] block/raw-posix: Fall back to SEEK_HOLE/SEEK_DA
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] [PATCH] block/raw-posix: Fall back to SEEK_HOLE/SEEK_DATA |
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Date: |
Tue, 06 May 2014 11:55:06 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
On 05/06/2014 11:46 AM, Max Reitz wrote:
>
> Okay, then I'll put the functionality in own functions and reverse the
> order in v2 while keeping the fallback idea, as I think there may exist
> systems where the reverse of what this patch tries to fix is true:
> SEEK_HOLE/SEEK_DATA is not supported, but FIEMAP is.
Correct - Linux implemented FIEMAP long before SEEK_HOLE, so there is a
range of kernels where FIEMAP is all you have. It is only non-Linux
where you will have SEEK_HOLE in isolation.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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