lfc_setratime
set the replica last access (read) date to the current time and increments
the counter of accesses to the replica.
This function should be called everytime a file replica is accessed.
sfn
is the Physical File Name for the replica.
RETURN VALUE
This routine returns 0 if the operation was successful or -1 if the operation
failed. In the latter case,
serrno
is set appropriately.
ERRORS
ENOENT
The named replica does not exist.
EACCES
Search permission is denied on a component of the file prefix or
the caller effective user ID does not match the owner ID of the file
or read permission on the file itself is denied.