Current _btrfs_get_subvolid() can't handle the following case at all:
# btrfs subvol list $SCRATCH_MNT
ID 256 gen 9 top level 5 path subv1
ID 257 gen 7 top level 256 path subv1/subv2
ID 258 gen 8 top level 256 path subv1/subv3
ID 259 gen 9 top level 256 path subv1/subv4
If we call "_btrfs_get_subvolid $SCRATCH_MNT subv1" we will get a list
of all subvolumes, not the subvolid of subv1.
To address this problem, we go egrep to match $name which starts with a
space, and at the end of a line.
So that all other subvolumes won't hit.
Suggested-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Qu Wenruo
f41020d7f0