[Qemu-devel] [Bug 603878] [NEW] [Feature request] qemu-img option about recompressing

[Коренберг Марк]

Public bug reported:

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.

** Affects: qemu
     Importance: Undecided
         Status: New

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[Feature request] qemu-img option about recompressing
https://bugs.launchpad.net/bugs/603878
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Status in QEMU: New

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.