[Solved] How to mount multi-device btrfs filesystem under systemd?

I am running full, native systemd. It always has an error during boot trying to mount my new, multi-device btrfs filesystem. There was no problem with mounting the filesystem when it resided on a single disk drive.
When it fails, it allows me to enter my root password and have a console. In this console, I can successfully mount the btrfs filesystem. Then boot continues normally, and then I can use the filesystem with no further problems, until the next reboot.
btrfs filesystem show /dev/sda4
failed to read /dev/sr0
Label: 'TimBTRFS' uuid: 317460bc-5b6a-4dac-acb8-7139dcbcff8b
Total devices 2 FS bytes used 31.67GB
devid 2 size 100.00GB used 2.00GB path /dev/sdb1
devid 1 size 100.00GB used 42.02GB path /dev/sda4
Btrfs Btrfs v0.19
I looked up btrfs in the wiki, and it says I have to run "btrfs device scan" before I can mount the filesystem. "This is the purpose of the btrfs mkinitcpio hook or the USEBTRFS variable in /etc/rc.conf" I do not have an rc.conf. I do not know how to do this with systemd. What do I need to do to resolve this?
Tim
Last edited by ratcheer (2012-09-06 12:12:24)

I added the btrfs hook as per the previous post. I ran "mkinitcpio -p linux". I ran grub-mkconfig. I rebooted and got the exact same problem. I did see the message early in the boot output that the btrfs hook was executed.
Here are the error messages:
[ 203.780864] device label TimBTRFS devid 1 transid 140 /dev/sda4
[ 203.781779] btrfs: disk space caching is enabled
[ 203.790133] btrfs: failed to read chunk tree on sda4
[ 203.790973] btrfs: open_ctree failed
Again, in the root console, I simply mounted the filesystem ("mount -t btrfs /dev/sda4 /btrfs"), typed Ctrl-d, and the bootup continued normally and successfully.
I need help, please.
Tim

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dt wrote:
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Last edited by Arien (2010-09-17 21:24:14)

Arien wrote:
yeah you were right, I got a mount rule there. I think I added it in order so that usb sticks are properly mounted. Hmm any way other than just deletring the rule?
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[SOLVED]Can't mount iPhone/Android devices.

Hi,
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I've tried to mount iOS device with ifuse, but it didn't work either.
Any idea?
Thanks in advance.
Last edited by Zack7777 (2013-11-11 10:13:26)

Thanks for the answers.
ewaller wrote:That looks like it is trying to treat your iPhone as a network interface. Have you turned on USB tethering on your phone? What happens if you turn it off?
It's always like this, no matter if I turn on or off tethering.
mzneverdies, donniezazen,
Ok, this seems to work with android devices but not with iOS. Also when I run detect while my iPhone is plugged in, device list is empty:
$ mtp-detect
Unable to open ~/.mtpz-data for reading, MTPZ disabled.libmtp version: 1.1.6
Listing raw device(s)
No raw devices found.
Main goal is to return support of iOS.
Last edited by Zack7777 (2013-09-12 07:56:34)

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Problem solved. Yes, installing kio-mtp solved my problem. KDE is indeed a superior DE. Thanks mzneverdies. I really appreciate your answer. (Before this I have tried kio-mtp-git from AUR, yeah because I followed the guide from ArchWiki but it failed to get the job done. Somebody please edit that part in ArchWiki.)
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Hi,
I'm trying to secure some files by encrypting a disk image (DMG file). I'm doing everything through the terminal so that I can script it.
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Steve

[Solved] How to mount multi-device btrfs filesystem under systemd?

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