[Bug 603878] Re: [Feature request] qemu-img option about recompressing

[Thomas Huth]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/81


** Changed in: qemu
       Status: New => Expired

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #81
   https://gitlab.com/qemu-project/qemu/-/issues/81

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https://bugs.launchpad.net/bugs/603878

Title:
  [Feature request] qemu-img option about recompressing

Status in QEMU:
  Expired

Bug description:
  Suppose I have a fresh compressed qcow2 image. After some time the
  data were recorded without compression. I decide to make "QEMU-IMG
  convert" for that image to reduce its size.

  I want a new option, which selects between the two algorithms overdriven 
images:
  1. extract all / compress again when converting images (in the current 
implementation)
  2. compress only uncompressed blocks and just copy the compressed blocks 
without re-compression.

  This option is only needed when converting compressed image to
  compressed and the compression algorithm is the same.

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