[Bug 1893667] Re: Btrfs commands don't work when using user-space emulation of other architectures

[John Snow]

Laurent, I am assuming that the commits here:
https://gitlab.com/qemu-project/qemu/-/commits/master?utf8=%E2%9C%93&search=Filip+Bozuta

are sufficient to mark this issue as Fix Committed. It looks like the
Downstream bug tracker for Fedora has marked the related bug as CLOSED
ERRATA already.

If I'm wrong, please reopen.

** Changed in: qemu
       Status: In Progress => Fix Committed

** Changed in: qemu
       Status: Fix Committed => In Progress

** Changed in: qemu
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1893667

Title:
  Btrfs commands don't work when using user-space emulation of other
  architectures

Status in QEMU:
  Fix Committed
Status in qemu package in Fedora:
  Unknown

Bug description:
  Description of problem:
  When doing cross-arch builds with mock, it uses qemu-user-static under the 
hood, and qemu-user-static lacks support for Btrfs ioctls to emulate so that 
btrfs(8) commands work correctly.

  This is especially important for being able to do cross-arch image
  builds.

  How reproducible:
  Always (on Fedora 33 with qemu-5.1.0-2.fc33)

  Steps to Reproduce:

  $ sudo dnf install mock qemu-user-static wget
  $ sudo usermod -a -G mock $USER
  $ newgrp mock
  $ mock --root fedora-rawhide-armhfp --install btrfs-progs util-linux
  $ mock --root fedora-rawhide-armhfp --chroot 'rm -f foo.img && dd 
if=/dev/zero of=foo.img bs=1G count=1 && losetup /dev/loop9 foo.img &&  
mkfs.btrfs /dev/loop9 && mkdir /foo && mount /dev/loop9 /foo && btrfs subvol 
create /foo/subvol && umount /foo && losetup -d /dev/loop9'

  
  Actual results:
  Fails with errors like "ERROR: cannot create subvolume: Function not 
implemented"

  Expected results:
  Succeeds and creates subvolumes properly.

  Additional info:
  There is a patch series from a few days ago to add support for many btrfs 
ioctls which could fix this...

  https://lists.gnu.org/archive/html/qemu-devel/2020-08/msg05594.html

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