On 6/23/20 4:35 PM, Eric Blake wrote:
Let's get nbd.ko out of the picture. The problem can be reproduced in
user space (here, where I built qemu-nbd to log trace messages to
stderr):
$ truncate --size=3G file
$ qemu-nbd -f raw file --trace=nbd_\*
$ nbdsh -u nbd://localhost:10810 -c 'h.trim(3*1024*1024*1024,0)'
nbd.Error: nbd_trim: trim: command failed: Input/output error (EIO)
so this is definitely a case of qemu as NBD server NOT honoring requests
between 2G and 4G. I'll have a patch posted soon.
https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg06592.html
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
