[9fans] Plan9 permissions

[rsc@plan9.bell-labs.com rsc@plan9.bell-labs.com]

	I think the paragraph should read:

	"When the owner attempts to do something to a file, the owner
	permissions are consulted only, and if they grant the requested
	permission, the operation is allowed.  For someone who is not the
	owner, but is a member of the files's group, only the group
	permissions are consulted.  The other permissions are only used
	if the requestor is not the owner or a member of the file's group."

but then it wouldn't be true.

it is silly to honor permissions that are not
monotonically nonincreasing (octal digitwise)
from owner to everyone.

if you are the owner and the permissions are
something like 466, then you can just change them
with chmod.  if you are in the group and the 
permissions are something like 446 or 646, then
you can just become none (echo -n none >/dev/user)
and then you have permission again.

look at /sys/src/fs/port/sub.c:/^iaccess
on the cd.

russ