macro mounts a file system into the systems namespace or updates the
attributes of an already mounted file system.
The arguments it expects are:
Structure representing the file system.
macro is called both to mount new file systems and to change the
attributes of an existing file system.
flag is set in
then the file system should update its internal state from the value of
This can be used, for instance, to convert a read-only file system to
It is also used by
to update the NFS export information for the file system.
flag is not specified, then this is a newly mounted file system.
The file system code should allocate and initialize
any private data needed to represent
the file system (it can use the
field to store this information).