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Description of problem:
When we want to change size of tmpfs mountpoint with remount, the size option is printed out multiply - an old one and new ones - and SELinux options are hidden.

Version-Release number of selected component (if applicable):
RHEL 6.5

How reproducible:
always

Steps to Reproduce:
1. mkdir /mnt/test; mount -t tmpfs -o size=40m none /mnt/test
2. check: mount | grep mnt/test
   # none on /mnt/test type tmpfs (rw,size=40,rootcontext="unconfined_u:object_r:mnt_t:s0")
3. mount -o remount,size=80m /mnt/test
4. check again: mount | grep mnt/test
   # none on /mnt/test type tmpfs (rw,size=40,size=80m)
5. ...continue how many times you want

Actual results:
mount command returns multiply size options and hide selinux options

Expected results:
mount command returns just one and correct size option and all current selinux options

This is mtab problem and recommended solution is to use findmnt(8) or /proc/mounts to get the real info about mountpoints. 

I have doubts we can fix this problem in any sane way for RHEL6. The problem is already fixed in RHEL7.