Re: [PATCH v2 8/9] selftests/mm: Skip map_populate on weird filesystems

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On Fri, 21 Feb 2025 at 19:26, Brendan Jackman <jackmanb@xxxxxxxxxx> wrote:
>
> It seems that 9pfs does not allow truncating unlinked files, Mark Brown
> has noted that NFS may also behave this way.

I have not investigated at all but I _think_ over the weekend I saw
ftruncate() failure on a QEMU guest where /tmp was tmpfs.

Most likely explanation is user probably error (like /tmp wasn't
actually tmpfs or the tmpfile() did not actually come from /tmp). But
still, maybe just waving my hands and going "buggy filesystem, ignore"
wasn't so smart. I should actually understand the problem before
switching off tests.

So, I think this and the other "ignore on weird filesystem" patch 9/9
should be ignored for the moment.




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