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

[Alexei Sheplyakov]

> - 501-block-raw-posix-fix-disk-corruption-in-try-fiemap
>   - (note - 502-block-raw-posic-use-seek-hole-ahead-of-fiemap (which was
>     also needed in utopic) appears to be unneeded here as the code being
>      changed has not yet been switched to using try_fiemap)

Actually such a enforces fsync and drastically reduces the performance of conversion.
I propose to use seek_hole instead of FIEMAP (which is basically what 
 502-block-raw-posic-use-seek-hole-ahead-of-fiemap does). 


** Patch added: "0500-block-raw-posix-Try-both-FIEMAP-and-SEEK_HOLE.patch"
   https://bugs.launchpad.net/qemu/+bug/1368815/+attachment/4282118/+files/0500-block-raw-posix-Try-both-FIEMAP-and-SEEK_HOLE.patch

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https://bugs.launchpad.net/bugs/1368815

Title:
  qemu-img convert intermittently corrupts output images

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