When mounting a subvolume by name, mountinfo shows the name of the subvolume.
When mounting a subvolume using subvolid it does not. Seems like a problem when
trying to determine what is mounted.
-o subvol=<name>
# cat /proc/self/mountinfo | grep vda
43 34 0:29 /home /home rw,relatime shared:29 - btrfs /dev/vda1
rw,seclabel,space_cache
44 34 0:29 /boot /boot rw,relatime shared:30 - btrfs /dev/vda1
rw,seclabel,space_cache
-o subvolid=<number>
#cat /proc/self/mountinfo
43 34 0:29 / /home rw,relatime shared:29 - btrfs /dev/vda1
rw,seclabel,space_cache
44 34 0:29 / /boot rw,relatime shared:30 - btrfs /dev/vda1
rw,seclabel,space_cache
By changing default subvolume to the ID of home subvolume, then mounting with no
options:
43 34 0:29 / /home rw,relatime shared:29 - btrfs /dev/vda1
rw,seclabel,space_cache
It seems the subvolid, and changed default subvolume behaviors are problematic,
trying to determine what is mounted. I''d expect in all cases this
should return a full path name, or a subvolume ID.
kernel 3.11.4-301.fc20.x86_64
btrfs-progs-0.20.rc1.20130917git194aa4a-1.fc20.x86_64
Chris Murphy--
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