hammer volume-add and volume-del issue

[lhmwzy]

In 2010,I reported this issue,
http://leaf.dragonflybsd.org/mailarchive/users/2010-04/msg00027.html
but when I try 3.6.0,this problem is still here.

when I use
hammer volume-add /dev/da1 /
then use
hammer volume-del /dev/da1 /

the / size is always grows.

Filesystem        Size   Used  Avail Capacity  Mounted on
ROOT              157G   805M   156G     0%    /

Filesystem        Size   Used  Avail Capacity  Mounted on
ROOT              236G   805M   235G     0%    /

da1 is 80G.

I use
 "hammer volume-add /dev/da1 /
hammer volume-del /dev/da1 /"
twice.


When reboot,the / size changes to the right size.
Filesystem        Size   Used  Avail Capacity  Mounted on
ROOT               78G   3.2G    75G     4%    /


http://gitweb.dragonflybsd.org/dragonfly.git/commit/16b533e86d040ed2450b060c3e99d1239d9a4266
does not fix the issue.
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