add several pieces to shared subtree documentation
authorAl Viro <viro@zeniv.linux.org.uk>
Sat, 16 Jan 2010 19:10:21 +0000 (14:10 -0500)
committerAl Viro <viro@zeniv.linux.org.uk>
Wed, 3 Mar 2010 18:00:23 +0000 (13:00 -0500)
* document locking
* add the missing part of data structure invariants (relationship
between mnt_share and mnt_slave lists in case of a peer group
among slaves).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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