code: mafs

ref: e82f565015fd0b75085d8d2a4f1aaca53e875f64
dir: /TODO/

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profiling
read only mode
mafswrite():
	add user and remove user messages
Add readahead?
need rlock() when looking up user id, group id, or user attributes
more consistent use of tree lock.
not using the tree lock for reads - replace RWlock with a Qlock sl
	RWlock is better than the Qlock. Just need to enforce it better.
file system checker
	fsck will be a different user space program
EXCL files - maintain a list of locks in the tree
APPEND files
ORCLOSE
correct /adm/ctl operation:
	echo df >> /adm/ctl
	cat /adm/ctl
make docs/mafs.ms more interesting?
test -A announce
Split out the Free Blocks - Extents section in the document.
Add a section on sizing npendingwrites
Clean up the Iobuf locking description
man/mafs.4 man/mafs.8
	Add EXAMPLES
	Add mafs.pdf as a resource