[pve-devel] drive-mirror : fix qemu hang at first phase (bitmap scanning)

[Alexandre Derumier]

Hi,
theses patches finally fix the bug with drive-mirror, which can hang qemu
when it's scan the source volume to create the bitmap.

It's occuring mainly with raw file (depend of filesystem), nfs and some block storage like ceph.

Currently when this occur, qemu and qmp are hanging (can take hours with big volumes).

So, the qemu patch add some small job pause between each iteration of the scan.