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Re: [Qemu-devel] hd-geo-test failing on OpenIndiana
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] hd-geo-test failing on OpenIndiana |
Date: |
Mon, 28 Jan 2013 09:23:43 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 |
Il 28/01/2013 08:53, Markus Armbruster ha scritto:
> Andreas Färber <address@hidden> writes:
>
>> Hello Markus,
>>
>> On OpenIndiana 151a7 I am seeing assertion failures for ret == 0 in
>> hd-geo-test.c:35:create_test_img(). It seems it is refusing to blow up
>> the temporary file. Any suggestion what to do about that?
>
> Fine print on ftruncate():
>
> If fildes refers to a regular file, the ftruncate() function shall
> cause the size of the file to be truncated to length. If the size
> of the file previously exceeded length, the extra data shall no
> longer be available to reads on the file. If the file previously
> was smaller than this size, ftruncate() shall either increase the
> size of the file or fail. XSI-conformant systems shall increase the
> size of the file. If the file size is increased, the extended area
> shall appear as if it were zero-filled. The value of the seek
> pointer shall not be modified by a call to ftruncate().
>
> Looks like OpenIndiana got stuck in the 20th century.
>
> If you care for such losing systems, you need create_test_img to fall
> back or switch wholesale to a less elegant way to create the image.
Traditionally you used a 1-byte write to create a sparse file, preceeded
by an lseek to offset SIZE-1.
Paolo