diff --git a/lib/libgeom/libgeom.3 b/lib/libgeom/libgeom.3
index e1a3a35b7062..79977630c90d 100644
--- a/lib/libgeom/libgeom.3
+++ b/lib/libgeom/libgeom.3
@@ -1,448 +1,448 @@
 .\" Copyright (c) 2003 Poul-Henning Kamp
 .\" Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 .\" All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
 .\" are met:
 .\" 1. Redistributions of source code must retain the above copyright
 .\"    notice, this list of conditions and the following disclaimer.
 .\" 2. Redistributions in binary form must reproduce the above copyright
 .\"    notice, this list of conditions and the following disclaimer in the
 .\"    documentation and/or other materials provided with the distribution.
 .\" 3. The names of the authors may not be used to endorse or promote
 .\"    products derived from this software without specific prior written
 .\"    permission.
 .\"
 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
 .\" $FreeBSD$
 .\"
 .Dd October 16, 2017
 .Dt LIBGEOM 3
 .Os
 .Sh NAME
 .Nm geom_stats_open ,
 .Nm geom_stats_close ,
 .Nm geom_stats_resync ,
 .Nm geom_stats_snapshot_get ,
 .Nm geom_stats_snapshot_free ,
 .Nm geom_stats_snapshot_timestamp ,
 .Nm geom_stats_snapshot_reset ,
 .Nm geom_stats_snapshot_next ,
 .Nm gctl_get_handle ,
 .Nm gctl_ro_param ,
 .Nm gctl_rw_param ,
 .Nm gctl_issue ,
 .Nm gctl_free ,
 .Nm gctl_dump ,
 .Nm geom_getxml ,
 .Nm geom_xml2tree ,
 .Nm geom_gettree ,
 .Nm geom_deletetree ,
 .Nm g_open ,
 .Nm g_close ,
 .Nm g_mediasize ,
 .Nm g_sectorsize ,
 .Nm g_stripeoffset ,
 .Nm g_stripesize ,
 .Nm g_flush ,
 .Nm g_delete ,
 .Nm g_device_path ,
 .Nm g_get_ident ,
 .Nm g_get_name ,
 .Nm g_open_by_ident ,
 .Nm g_providername
 .Nd userland API library for kernel GEOM subsystem
 .Sh LIBRARY
 .Lb libgeom
 .Sh SYNOPSIS
 .Bd -literal
 /* stdio.h is only required for `gctl_dump` */
 .Ed
 .In stdio.h
 .In libgeom.h
 .Ss "Statistics Functions"
 .Ft void
 .Fn geom_stats_close void
 .Ft int
 .Fn geom_stats_open void
 .Ft void
 .Fn geom_stats_resync void
 .Ft "void *"
 .Fn geom_stats_snapshot_get void
 .Ft void
 .Fn geom_stats_snapshot_free "void *arg"
 .Ft void
 .Fn geom_stats_snapshot_timestamp "void *arg" "struct timespec *tp"
 .Ft void
 .Fn geom_stats_snapshot_reset "void *arg"
 .Ft "struct devstat *"
 .Fn geom_stats_snapshot_next "void *arg"
 .Ss "Control Functions"
 .Ft "struct gctl_req *"
 .Fn gctl_get_handle "void"
 .Ft void
 .Fn gctl_ro_param "struct gctl_req *req" "const char *name" "int len" "const void *value"
 .Ft void
 .Fn gctl_rw_param "struct gctl_req *req" "const char *name" "int len" "void *value"
 .Ft "const char *"
 .Fn gctl_issue "struct gctl_req *req"
 .Ft void
 .Fn gctl_free "struct gctl_req *req"
 .Ft void
 .Fn gctl_dump "struct gctl_req *req" "FILE *f"
 .Ss "Utility Functions"
 .Ft "char *"
 .Fn geom_getxml void
 .Ft int
 .Fn geom_xml2tree "struct gmesh *gmp" "char *p"
 .Ft int
 .Fn geom_gettree "struct gmesh *gmp"
 .Ft void
 .Fn geom_deletetree "struct gmesh *gmp"
 .Ft int
 .Fn g_open "const char *name" "int dowrite"
 .Ft int
 .Fn g_close "int fd"
 .Ft off_t
 .Fn g_mediasize "int fd"
 .Ft ssize_t
 .Fn g_sectorsize "int fd"
 .Ft ssize_t
 .Fn g_stripeoffset "int fd"
 .Ft ssize_t
 .Fn g_stripesize "int fd"
 .Ft int
 .Fn g_flush "int fd"
 .Ft int
 .Fn g_delete "int fd" "off_t offset" "off_t length"
 .Ft "char *"
 .Fn g_device_path "const char *devpath"
 .Ft int
 .Fn g_get_ident "int fd" "char *ident" "size_t size"
 .Ft int
 .Fn g_get_name "const char *ident" "char *name" "size_t size"
 .Ft int
 .Fn g_open_by_ident "const char *ident" "int dowrite" "char *name" "size_t size"
 .Ft "char *"
 .Fn g_providername "int fd"
 .Sh DESCRIPTION
 The
 .Nm geom
 library contains the official and publicized API for
 interacting with the GEOM subsystem in the kernel.
 .Ss "Statistics Functions"
 GEOM collects statistics data for all consumers and providers, but does
 not perform any normalization or presentation on the raw data, this is
 left as an exercise for user-land presentation utilities.
 .Pp
 The
 .Fn geom_stats_open
 and
 .Fn geom_stats_close
 functions open and close the necessary pathways to access the raw
 statistics information in the kernel.
 These functions are likely to
 open one or more files and cache the file descriptors locally.
 The
 .Fn geom_stats_open
 function returns zero on success, and sets
 .Va errno
 if not.
 .Pp
 The
 .Fn geom_stats_resync
 function will check if more statistics collection points have been
 added in the kernel since
 .Fn geom_stats_open
 or the previous call to
 .Fn geom_stats_resync .
 .Pp
 The
 .Fn geom_stats_snapshot_get
 function
 will acquire a snapshot of the raw data from the kernel, and while a
 reasonable effort is made to make this snapshot as atomic and consistent
 as possible, no guarantee is given that it will actually be so.
 The snapshot must be freed again using the
 .Fn geom_stats_snapshot_free
 function.
 The
 .Fn geom_stats_snapshot_get
 function returns
 .Dv NULL
 on failure.
 .Pp
 The
 .Fn geom_stats_snapshot_timestamp
 function
 provides access to the timestamp acquired in the snapshot.
 .Pp
 The
 .Fn geom_stats_snapshot_reset
 and
 .Fn geom_stats_snapshot_next
 functions
 provide an iterator over the statistics slots in the snapshot.
 The
 .Fn geom_stats_snapshot_reset
 function
 forces the internal pointer in the snapshot back to before the first item.
 The
 .Fn geom_stats_snapshot_next
 function
 returns the next item, and
 .Dv NULL
 if there are no more items in the snapshot.
 .Ss "Control Functions"
 The
 .Fn gctl_*
 functions are used to send requests to GEOM classes.
 In order for a GEOM
 class to actually be able to receive these requests, it must have defined a
 "ctlreq" method.
 .Pp
 A
 .Vt "struct gctl_req *" ,
 obtained with
 .Fn gctl_get_handle ,
 can hold any number of parameters, which must be added to it with
 .Fn gctl_ro_param
 (for read-only parameters) or
 .Fn gctl_rw_param
 (for read/write parameters).
 .Pp
 Both
 .Fn gctl_ro_param
 and
 .Fn gctl_rw_param
 take a string
 .Fa name ,
 which is used to identify the parameter, and a
 .Fa value ,
 which contains, in the read-only case, the data to be passed to the
 GEOM class, or, in the read/write case, a pointer to preallocated memory
 that the GEOM class should fill with the desired data.
 If
 .Fa len
 is negative, it is assumed that
 .Fa value
 is an
 .Tn ASCII
 string and the actual length is taken from the string length of
 .Fa value ;
 otherwise it must hold the size of
 .Fa value .
 .Pp
 A parameter with a
 .Fa name
 containing the string
 .Qq Li class
 is mandatory for each request, and the
 corresponding
 .Fa value
 must hold the name of the GEOM class where the request should be sent to.
 .Pp
 Also mandatory for each request is a parameter with a
 .Fa name
 called
 .Qq Li verb ,
 and the corresponding
 .Fa value
 needs to hold the command string that the GEOM class should react upon.
 .Pp
 Once all desired parameters are filled in, the request must be sent to
 the GEOM subsystem with
 .Fn gctl_issue ,
 which returns
 .Dv NULL
 on success, or a string containing the error message
 on failure.
 .Pp
 After the request is finished, the allocated memory should be released with
 .Fn gctl_free .
 .Pp
 The
 .Fn gctl_dump
 function
 can be used to format the contents of
 .Fa req
 to the open file handle pointed to by
 .Fa f ,
 for debugging purposes.
 .Pp
 Error handling for the control functions is postponed until the call
 to
 .Fn gctl_issue ,
 which returns
 .Dv NULL
 on success, or an error message corresponding to the
 first error which happened.
 .Ss "Utility Functions"
 The
 .Fn geom_getxml
 function is a wrapper around
 .Xr sysctl 3
 that fetches the
 .Ar kern.geom.confxml
 OID, and returns it's value.
 The allocated memory should be released with
-.Xr free 2
+.Xr free 3
 after use.
 .Pp
 The
 .Fn geom_xml2tree
 function parses the XML representation of a GEOM topology passed as
 .Ar p ,
 allocates the needed data structures to access this information and fills in
 the passed
 .Ar gmp
 data structure.
 Memory allocated during this transformation should be released
 using
 .Fn geom_deletetree
 after use.
 .Pp
 The
 .Fn geom_gettree
 function is a wrapper around the
 .Fn geom_getxml
 and
 .Fn geom_xml2tree
 functions.
 Memory allocated during this operation should be released using
 .Fn geom_deletetree
 after use.
 .Pp
 The
 .Fn geom_deletetree
 function releases memory allocated for storing the data-structures referenced by
 .Ar gmp .
 .Pp
 The
 .Fn g_*
 functions are used to communicate with GEOM providers.
 .Pp
 The
 .Fn g_open
 function opens the given provider and returns file descriptor number, which can
 be used with other functions.
 The
 .Fa dowrite
 argument indicates if operations that modify the provider (like
 .Fn g_flush
 or
 .Fn g_delete )
 are going to be called.
 .Pp
 The
 .Fn g_close
 function closes the provider.
 .Pp
 The
 .Fn g_mediasize
 function returns size of the given provider.
 .Pp
 The
 .Fn g_sectorsize
 function returns sector size of the given provider.
 .Pp
 The
 .Fn g_stripeoffset
 function returns stripe offset of the given provider.
 .Pp
 The
 .Fn g_stripesize
 function returns stripe size of the given provider.
 .Pp
 The
 .Fn g_flush
 function sends
 .Dv BIO_FLUSH
 request to flush write cache of the provider.
 .Pp
 The
 .Fn g_delete
 function tells the provider that the given data range is no longer used.
 .Pp
 The
 .Fn g_device_path
 function returns the full path to a provider given a partial or full path to the
 device node.
 .Dv NULL
 is returned if the device cannot be found or is not a valid geom provider.
 .Pp
 The
 .Fn g_get_ident
 function returns provider's fixed and unique identifier.
 The
 .Fa ident
 argument should be at least
 .Dv DISK_IDENT_SIZE
 big.
 .Pp
 The
 .Fn g_get_name
 function returns name of the provider, which identifier is equal to the
 .Fa ident
 string.
 .Pp
 The
 .Fn g_open_by_ident
 function opens provider using its identification, unlike
 .Fn g_open
 which uses the provider's name.
 The function will store the provider's name in the
 .Fa name
 parameter if it is not
 .Dv NULL .
 .Pp
 The
 .Fn g_providername
 function returns the provider name of an open file descriptor.
 .Dv NULL
 is returned the file descriptor does not point to a valid geom provider.
 .Pp
 All functions except
 .Fn g_providername
 and
 .Fn g_device_path
 return a value greater than or equal to
 .Va 0
 on success or
 .Va -1
 on failure.
 .Sh EXAMPLES
 Create a request that is to be sent to the CCD class, and tell
 it to destroy a specific geom:
 .Bd -literal -offset indent
 H = gctl_get_handle();
 gctl_ro_param(H, "verb", -1, "destroy geom");
 gctl_ro_param(H, "class", -1, "CCD");
 sprintf(buf, "ccd%d", ccd);
 gctl_ro_param(H, "geom", -1, buf);
 errstr = gctl_issue(H);
 if (errstr != NULL)
     err(1, "could not destroy ccd: %s", errstr);
 gctl_free(H);
 .Ed
 .Sh HISTORY
 The
 .Nm geom
 library appeared in
 .Fx 5.1 .
 .Sh AUTHORS
 .An Poul-Henning Kamp Aq Mt phk@FreeBSD.org
 .An Lukas Ertl Aq Mt le@FreeBSD.org
 .An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org