[Bug 1368815] Re: qemu-img convert intermittently corrupts output images

[Alexei Sheplyakov]

> Patch 0500-block-raw-posix-Try-both-FIEMAP-and-SEEK_HOLE.patch appears to be part of a bigger re-write
> of the related code. and is ON TOP of the patches already applied in this bug.

Yep, sorry for not mentioning this. As far as I understand qemu-2.1 package contains this partially rewritten
code too (without any recent changes like disabling FIEMAP completely and rewriting the code using SEEK_HOLE).

> No doubt the rewirtten code is "better" but backporting it contains
more risk than the 2 simple fixes I already nominated.

Can we completely disable the FIEMAP code and pretend that all blocks are allocated? I'm afraid fsync'ing 100+ GB
files might be even slower than ignoring the sparseness.

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Title:
  qemu-img convert intermittently corrupts output images

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