code: mafs

ref: b3ccded71dc0330ba63fdb7d7a0e6fc6ded1657e
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.
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
	((ups time in seconds )/2) * (diskspeed in bytes/second) / Rawblocksize
Clean up the Iobuf locking description
man/mafs.4 man/mafs.8
	Add EXAMPLES
	Add mafs.pdf as a resource
Test that removed directories do not show up in the directory listing