The way an encrypted home is mounted is based on links as described here:
https://help.ubuntu.com/community/EncryptedPrivateDirectory
It used to be ok before 3.17-rc3 and df -h shows:
/dev/sda5 363G 128G 217G 38% /
/home/gnata/.Private 363G 128G 217G 38% /home/gnata
It is suppose to work with a kernel >3.17-rc3 when "home" btrfs is a
subvolume?
Does it make sense to test "[PATCH] btrfs-progs: canonicalize pathnames
for device commands" or it is premature?
Xavier
Hi Xavier,
Thanks for the report.
I got this reproduced: its a very corner case, it depends on the
device path given in the subsequent subvol mounts, the fix appear
to be outside of this patch at this moment and I am digging to know
if we need to normalize the device path before using it in the btrfs
kernel, just like btrfs-progs did recently.
reproducer:
ls -l /root/dev/sde-link
/root/dev/sde-link -> /dev/sde
mount -o device=/root/dev/sde-link /dev/sdd /btrfs1
btrfs fi show
Label: none uuid: 943bf422-998c-4640-9d7f-d49f17b782ce
Total devices 2 FS bytes used 272.00KiB
devid 1 size 1.52GiB used 339.50MiB path /dev/sdd
devid 2 size 1.52GiB used 319.50MiB path /root/dev/sde-link
mount -o subvol=sv1,device=/dev/sde /dev/sdd /btrfs <-shouldn't fail.
mount: /dev/sdd already mounted or /btrfs busy
mount: according to mtab, /dev/sdd is mounted on /btrfs1
mount -o device=/root/dev/sde-link /dev/sdd /btrfs
echo $?
0
Xavier, Johannes,
The quickest workaround for you will be to try to match
the device path as in the btrfs fi show -m </mnt> output to
your probably fstab/mnttab entry.
Anand
On 09/13/2014 04:43 AM, xavier.gn...@gmail.com wrote:
Hi,
On standard ubuntu 14.04 a with an encrypted (cryptsetup) /home as brtfs
subvolume we have the following results:
3.17-rc2 : Ok.
3.17-rc3 and 3.17-rc4 : /home fails to mount on boot. If one try mount
-a then the system tells that the partition is already mounted according
to matab.
On a 3.17-rc4, btrfs fi sh returns nothing special:
"
Label: none uuid: f4f554bb-57d9-4647-ab14-ea978c9e7e9f
Total devices 1 FS bytes used 131.41GiB
devid 1 size 173.31GiB used 134.03GiB path /dev/sda5
Btrfs v3.12
"
I'm not sure if it has something to do with cryptsetup...
Xavier
Hi Johannes,
I've two more systems with kernel version >3.17-rc3
running and no problem like this.
Does this 3.17-rc3 also has the same type of subvol config
and it mount operation/sequence as you mentioned ?
> - one hdd with btrfs
> - default subvolume (rootfs) is different from subovlid=0
> - at boot, several subvols are mounted at /home/$DIR
I ran a few tests, on our mainline
----
mount -o subvol=sv1 /dev/sdh1 /btrfs
mount /dev/sdh1 /btrfs
mount: /dev/sdh1 already mounted or /btrfs busy [*]
mount /dev/sdh1 /btrfs1
echo $?
0
-----
[*] hope this isn't the problem you are mentioning.
Thanks, Anand
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