vfs_suser9
Check if credentials have superuser privileges for a mount point
Usage
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
int
vfs_suser(struct mount *mp, struct thread *td);
Overview
The vfs_suser() function checks if the credentials given include superuser powers for the given mount point. It will check to see if the thread passed in has the same credentials as the user that mounted the file system. If so, it returns 0, otherwise it returns what suser(9) would have returned.
Return values
The vfs_suser() function returns 0 if the user has superuser powers and EPERM otherwise. This is the reverse logic of some other implementations of suser() in which a TRUE response indicates superuser powers.