misc/186252: Cannot mount an encrypted swap file in fstab

[Mark Voortman]

>Number:         186252
>Category:       misc
>Synopsis:       Cannot mount an encrypted swap file in fstab
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jan 29 19:00:00 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Mark Voortman
>Release:        10.0
>Organization:
>Environment:
FreeBSD freebsd.localhost 10.0-RELEASE FreeBSD 10.0-RELEASE #0 r260789: Thu Jan 16 22:34:59 UTC 2014     root at snap.freebsd.org:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
Adding

  md none swap sw,file=/swap 0 0

to /etc/fstab mounts the swap file on boot, but it will be unencrypted. When I make it md.eli (or md0.eli or /dev/md.eli or /dev/md0.eli) the swap file is not mounted. This approach does work for swap partitions (e.g., /dev/ada1.eli).
>How-To-Repeat:
Create a swap file:

  dd if=/dev/zero of=/swap bs=1024k count=64
  chmod 0600 /swap

and add it to /etc/fstab

  md.eli none swap sw,file=/swap 0 0

and reboot. The (encrypted) swap file will not be available.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: