On Sat, 13 Sep 2014 19:55:25 +0200
Johannes Hirte <johannes.hirte@xxxxxxxxxxxxx> wrote:
> On Sat, 13 Sep 2014 13:36:37 +0800
> Anand Jain <Anand.Jain@xxxxxxxxxx> wrote:
>
> > Xavier, Johannes,
> >
> > The quickest workaround for you will be to try to match
> > the device path as in the btrfs fi show -m </mnt> output to
> > your probably fstab/mnttab entry.
>
> Doesn't work here. I don't even get a path with the affected kernels.
> I'll get:
>
> Label: none uuid: 02edbd6b-f044-4800-b21e-ca8982c2c2e5
> Total devices 1 FS bytes used 270.10GiB
> *** Some devices missing
>
> Btrfs v3.16
>
> with a working kernel:
>
> Label: none uuid: 02edbd6b-f044-4800-b21e-ca8982c2c2e5
> Total devices 1 FS bytes used 270.10GiB
> devid 1 size 293.89GiB used 289.06GiB path /dev/sda1
>
> Btrfs v3.16
>
> Filesystem layout is:
>
> subvolid 0 contains only the different subvolumes
>
> ID 257 gen 414674 top level 5 path rootfs
> ID 269 gen 414615 top level 5 path home-USER1
> ID 317 gen 411498 top level 5 path home-USER2
> ID 363 gen 410939 top level 5 path home-USER3
> ID 382 gen 315844 top level 5 path home-USER4
> ID 933 gen 410514 top level 5 path home-USER5
> ID 995 gen 315756 top level 5 path homefs-USER6
>
> subvol rootfs (ID 257) is set to the default subvolume, mounted at
> start. Grub commandline is like following:
>
> root=/dev/sda1 ro rootflags=subvol=rootfs,inode_cache,autodefrag
>
> It doesn't matter, if the subvol parameter is set. I've tried with,
> without and with subvolid=0 parameter. Everytime the same result.
>
>
> 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. 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
if [[ -x /newroot/sbin/init ]]; then
umount /sys /proc
exec switch_root /newroot /sbin/init
fi
#rescue shell
exec sh
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