remount的意義

Controlling and Querying Mounts

int mount (const char *special_file, const char *dir, const char *fstype, unsigned long int options, const void *data)

For a remount, dir specifies the mount point where the filesystem to be remounted is (and remains) mounted and special_file is ignored. Remounting a filesystem means changing the options that control operations on the filesystem while it is mounted. It does not mean unmounting and mounting again.

Mount, Unmount, Remount