filesystem mount problem

[Ian Lepore]

On Sun, 2019-07-21 at 15:07 -0400, AN wrote:
> Hi:
> 
> FreeBSD FreeBSD_13 13.0-CURRENT FreeBSD 13.0-CURRENT #102 r350187:
> Sat Jul 
> 20 19:04:30 EDT 2019 
> root at FreeBSD_13:/usr/obj/usr/src/amd64.amd64/sys/MYKERNEL  amd64
> 1300036
> 
> I would appreciate some help with the following problem.
> 
> /etc/fstab:
> # Device	Mountpoint	FStype	Options	Dump	Pass#
> /dev/ada0p2	none		swap	sw	0	0
> /dev/ada0p3	/		ufs	rw	1	1
> linprocfs   /compat/linux/proc	linprocfs	rw	0	0
> tmpfs    /compat/linux/dev/shm	tmpfs	rw,mode=1777	0	
> 0
> 
> 
> # df -h
> Filesystem     Size    Used   Avail Capacity  Mounted on
> /dev/ada0p3    428G    245G    149G    62%    /
> devfs          1.0K    1.0K      0B   100%    /dev
> linprocfs      4.0K    4.0K      0B   100%    /compat/linux/proc
> tmpfs           47G    4.0K     47G     0%    /compat/linux/dev/shm
> tmpfs           20M    604K     19M     3%    /tmp
> 
> I don't understand why the /tmp is being mounted.  It is causing
> problems 
> because when I try to run portupgrade it fails for lack of space.  If
> I 
> forcibly unmount it everything breaks.
> 
> # umount -v /tmp
> umount: unmount of /tmp failed: Device busy
> [root at FreeBSD_13 ~]# umount -vf /tmp
> tmpfs: unmount from /tmp
> [root at FreeBSD_13 ~]# df -h
> Filesystem     Size    Used   Avail Capacity  Mounted on
> /dev/ada0p3    428G    245G    149G    62%    /
> devfs          1.0K    1.0K      0B   100%    /dev
> linprocfs      4.0K    4.0K      0B   100%    /compat/linux/proc
> tmpfs           47G    4.0K     47G     0%    /compat/linux/dev/shm
> [root at FreeBSD_13 ~]# vinagre
> Unable to init server: Could not connect to 127.0.0.1: Connection
> refused
> 
> (vinagre:27111): Gtk-WARNING **: 15:04:21.599: cannot open display:
> :0
> 
> Any help would be appreciated, thanks in advance.
> 

The problem isn't that /tmp is tmpfs, the problem is that it's being
mounted by /etc/rc.d/tmp as a 20MB filesystem because tmpsize="20m" is
the default.  You could set tmpsize to some bigger value in rc.conf, or
you can add an explicit mount for /tmp in fstab so that you get the
full (47G on your system) capacity that's available:

 tmpfs /tmp tmpfs rw 0 0

-- Ian