btrfs: Use word mathcing for _btrfs_get_subvolid()
authorQu Wenruo <wqu@suse.com>
Fri, 7 Feb 2020 01:59:40 +0000 (09:59 +0800)
committerEryu Guan <guaneryu@gmail.com>
Sun, 9 Feb 2020 15:56:09 +0000 (23:56 +0800)
commitf41020d7f026a88767bee590cc698cec9ec0b155
tree0a08ea8924b37df7027913945520899c22f43452
parent05730e20c354a289853ace9867ef83e29688c9f3
btrfs: Use word mathcing for _btrfs_get_subvolid()

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>
common/btrfs