-------- Original Message --------
Subject: Re: Identify mounted subvolume
From: Hugo Mills <hugo@xxxxxxxxxxxxx>
To: Juan Orti Alcaine <juan.orti@xxxxxxxxxxxx>
Date: 2014年10月07日 17:06
On Tue, Oct 07, 2014 at 10:47:56AM +0200, Juan Orti Alcaine wrote:
I cannot find the answer to this one. How can I determine which subvolume I
have mounted in a certain path? I'm looking through /sys but no clue.
Rumour has it that /proc/self/mountinfo is meant to have the
information, but I've just checked, and it doesn't seem to have the
subvol in it on my server (3.16.2).
Hugo.
This accepted patch will make /proc/self/mountinfo to have all the info.
https://patchwork.kernel.org/patch/4593831/
But I didn't see it in 3.17 kernel or integration branch, maybe next
merge window?
Even without the patch, when mounting using '-o subvol=' mount option
will also fill the /proc/self/mountinfo,
using 3.16.4.
---
149 19 0:39 / /mnt/btrfs rw,relatime shared:101 - btrfs /dev/sda6
rw,space_cache
153 19 0:39 */subvol1* /mnt/other rw,relatime shared:104 - btrfs
/dev/sda6 rw,space_cache
---
On the other hand, without the patch and you mount with '-o subvolid=',
then mountinfo will not help.
Thanks,
Qu
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
