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Add a user_struct to the mq_inode_info structure.  Charge the maximum number
of bytes that could be allocated to a mqueue to the user who creates the
mqueue.  This is checked against the per user rlimit.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>