Re: "Btrfs: device_list_add() should not update list when mounted" breaks subvol mount

[Anand Jain <Anand.Jain@oracle.com>]

>> And now I was able to reproduce on a second machine. The main
>> difference between the affected and the unaffected systems is
>> initramfs. On the affected systems, I don't use one.

  In this test of with or without initramfs script. I guess the kernel
  remain same at 3.17-rc3 and above

>> On the working
>> systems, the rootfs is mounted via initramfs before. I'll test, if an
>> initramfs will solve the issue. Seems likely, cause if I put the disk
>> of an affected system into a working system and mount it there,
>> everything works.
>
> Of course, with the initramfs it works. Content of the init-script:
>
> #!/bin/sh
>
> mount -t devtmpfs devtmpfs /dev
> mount -t proc proc /proc
> mount -t sysfs sysfs /sys
> mount -t tmpfs tmpfs /run
> sleep 3  # wait for kernel msgs to quiet
>
> echo "loading initrd"
>
> btrfs dev scan
> sleep 5
>
> mount -o ro,subvol=rootfs,inode_cache,autodefrag /dev/sda1 /newroot

  this will work since the device path that we provide here
  is already the device path which probably will be the final
  device path after bootup.

Thanks

> if [[ -x /newroot/sbin/init ]]; then
>          umount /sys /proc
>          exec switch_root /newroot /sbin/init
> fi
>
> #rescue shell
> exec sh