On 15/09/14 17:42, Anand Jain wrote:
Logs from Sam, tells the problem clearly. mount is using
/dev/sda, but mount error message and kernel is using /dev/vda.
----------------------
$ mount /dev/sda /home -t btrfs -o subvol=/state/home,defaults,rw,noatime
mount: /dev/vda is already mounted or /home busy
/dev/vda is already mounted on /
Sorry for the confusion here. I typed in the shell commands into the log
manually and obviously put /dev/sda when I meant /dev/vda.
I've retested with /dev/vda and the same error occurs.
On 15/09/2014 23:13, Sam Thursfield wrote:
Hi!
I'm having an issue with the 3.17rc5 kernel which prevents having
multiple subvolumes of the same disk mounted.
I'm not sure exactly the cause. I thought it might be because in my
system the root file system is itself a subvolume of the disk I'm trying
to mount. But if I create a second disk image with two subvolumes, the
same thing occurs -- I can only mount one of them at a time.
I've attached the output of a few commands, please let me know if you
want more info (I'm not subscribed to the list, please keep me in To:).
We've bisected and found that the exact commit that changed the
behaviour is this one:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b96de000bc8bc9688b3a2abea4332bd57648a49f
I'm afraid I'm not familiar with the Btrfs code base and so I don't
understand the exact meaning of the comments in that commit.
Thanks
Sam
--
Sam Thursfield, Codethink Ltd.
Office telephone: +44 161 236 5575
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