code: mafs

ref: ddd35edac6785918a0c4ca11548db2a7f211a732
dir: /TODO/

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test recovery from crash or improper shutdown
address the fragmentation of memunits
sort extents by size
	does that help?
		finds stuff quicker - really, by how much?
test exclusive use file access
test syncusers()
not updating Qid.version on writes or changes
fswstat TODO
streamline the error codes
mafswrite():
	add user and remove user messages
	users format has changed as per this http://9p.io/wiki/plan9/Setting_up_Fossil/index.html
profiling
read only mode
need rlock() when looking up user id, group id, or user attributes
Clean up the Iobuf locking description?
APPEND files
not a priority, are they even needed?
-------------------------------------
make docs/mafs.ms more interesting?
Open device file in EXCL mode?
	not possible. It is set at create time.
Add readahead?
ORCLOSE	remove on close
correct /adm/ctl operation:
	echo df >> /adm/ctl
	cat /adm/ctl