[Bug 254210] 13.0-RC1: jail: nullfs: deleted files does not free up space

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254210

            Bug ID: 254210
           Summary: 13.0-RC1: jail: nullfs: deleted files does not free up
                    space
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: rashey at superbox.pl

Sometimes it is necessary to share the same directory between jails and in this
case there is a issue with free up space after deleting a files.

For example, the file created in jail A and then deleted in jail B will not
free up space as long as jail A is running.

# cat /etc/fstab.test1
/storage/data   /usr/jail/test1/storage/data    nullfs          rw,noatime     
0       0

# cat /etc/fstab.test2
/storage/data   /usr/jail/test2/storage/data    nullfs          rw,noatime     
0       0

# cat /etc/jail.conf
path = "/usr/jail/${name}";
exec.clean;
exec.start      = "sh /etc/rc";
exec.stop       = "sh /etc/rc.shutdown jail";
host.hostname   = "${name}";
mount.fstab     = "/etc/fstab.${name}";
mount.devfs;
test1 {
}
test2 {
}

# df -ht ufs
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0p2    8.9G    3.2G    5.0G    39%    /

# service jail start
Starting jails: test1 test2.

# df -ht ufs
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0p2    8.9G    3.2G    5.0G    39%    /

# jexec test1 dd if=/dev/random of=/storage/data/random.dd bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes transferred in 3.723429 secs (288374490 bytes/sec)

# df -ht ufs
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0p2    8.9G    4.2G    4.0G    52%    /

# jexec test2 rm /storage/data/random.dd

# df -ht ufs
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0p2    8.9G    4.2G    4.0G    52%    /

# service jail stop test2
Stopping jails: test2.

# df -ht ufs
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0p2    8.9G    4.2G    4.0G    52%    /

# service jail stop test1
Stopping jails: test1.

# df -ht ufs
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0p2    8.9G    3.2G    5.0G    39%    /

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