OS-1566 filesystem limits for ZFS datasets

*** 1,7 ****
--- 1,8 ----
  '\" te
  .\" Copyright (c) 2012 by Delphix. All rights reserved.
+ .\" Copyright (c) 2012 Joyent, Inc. All rights reserved.
  .\" The contents of this file are subject to the terms of the Common Development
  .\" and Distribution License (the "License").  You may not use this file except
  .\" in compliance with the License. You can obtain a copy of the license at
  .\" usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.
  .\"
*** 10,20 ****
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  .\" usr/src/OPENSOLARIS.LICENSE.  If applicable, add the following below this
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  .\" Portions Copyright [yyyy] [name of copyright owner]
! .TH ZPOOL-FEATURES 5 "Mar 16, 2012"
  .SH NAME
  zpool\-features \- ZFS pool feature descriptions
  .SH DESCRIPTION
  .sp
  .LP
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  .\" CDDL HEADER in each file and include the License file at
  .\" usr/src/OPENSOLARIS.LICENSE.  If applicable, add the following below this
  .\" CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your
  .\" own identifying information:
  .\" Portions Copyright [yyyy] [name of copyright owner]
! .TH ZPOOL-FEATURES 5 "Oct 24, 2012"
  .SH NAME
  zpool\-features \- ZFS pool feature descriptions
  .SH DESCRIPTION
  .sp
  .LP
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  This feature is \fBactive\fR while there are any filesystems, volumes,
  or snapshots which were created after enabling this feature.
  .RE
  
+ .sp
+ .ne 2
+ .na
+ \fB\fBfilesystem_limits\fR\fR
+ .ad
+ .RS 4n
+ .TS
+ l l .
+ GUID    com.joyent:filesystem_limits
+ READ\-ONLY COMPATIBLE   yes
+ DEPENDENCIES    none
+ .TE
+ 
+ This feature enables filesystem and snapshot limits. These limits can be used
+ to control how many filesystems and/or snapshots can be created at the point in
+ the tree on which the limits are set.
+ 
+ This feature is \fBactive\fR once either of the limit properties has been
+ set on a dataset and is deactivated when the last limit is removed.
+ .RE
+ 
  .SH "SEE ALSO"
  \fBzpool\fR(1M)