Too much policy in the macros

PUFFSOP_PROTOS naming pattern is undocumented

puffs_ops doesn't mention fs_extattrctl

PUFFSOP_INIT initializes pointers to all-0-bits

Return values from fs ops are undocumented

puffs(3) says "It is advisable to simply use the struct puffs_node
address as a cookie and store file system specific data in the private
portion of struct puffs_node.  The library assumes this by default.".
It does not, however, give any indication where to get a puffs_node for
the last arg to puffs_mount!  puffs_set_cookiemap is mentioned but not
documented.

fs_nodetofh is documented as taking a puffs_cooie_t, but there is no
such type.

puffs(3) doc for puffs_init says _PATH_PUFFS, but it's not defined.

puffs_init() frees(!!) the ops struct; this is not documented.

puffs_cookie_t is not documented at all

node_readdir fourth arg is called readoff but text calls it offset

puffs_nextdent is recommended for readdir use but isn't documented

Lookup op is documented as using PUFFSLOOKUP_*, which don't exist.

node_lookup documentation says "eof-of-file".

When puffs_init fails, it sets errno; this is not documented.