9:acct auto close mnt
From Linux Man Pages
acct_auto_close_mnt - turn off a filesystem's accounting if it is on
void acct_auto_close_mnt(struct vfsmount * m);
ARGUMENTS
m
vfsmount being shut down
DESCRIPTION
If the accounting is turned on for a file in the subtree pointed to to by m, turn accounting off. Done when m is
about to die.