How to change the default mount option of root filesystem in RHEL?

How to Fix

1. Add [rootflags] variable at the end of the line of GRUB_CMDLINE_LINUX in /etc/default/grub as below:
   [example]

   GRUB_CMDLINE_LINUX="rd.lvm.lv=rhel/swap crashkernel=auto rd.lvm.lv=rhel/root rhgb quiet biosdevname=0 rootflags=pquota"
   

2. Generate a GRUB configuration file.

   # grub2-mkconfig -o /boot/grub2/grub.cfg
   

3. Reboot the host.

   # reboot
   

4. Check the option we set be effective.

   # mount | grep root
    /dev/mapper/rhel-root on / type xfs (rw,relatime,attr2,inode64,prjquota)                             //prjquota
   

   Note: prjquota is the same with pquota. Please refer the man page of mount.

   # man mount