4 files changed, 49 insertions, 7 deletions
diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
index 52ec9be3ae02..fecde7152f80 100644
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -1,6 +1,6 @@
 .include <src.opts.mk>
 
-PACKAGE=	kernel-man
+MANPACKAGE=	kernel-man
 
 MAN=	accept_filter.9 \
 	accf_data.9 \
@@ -90,6 +90,7 @@ MAN=	accept_filter.9 \
 	DECLARE_MODULE.9 \
 	DEFINE_IFUNC.9 \
 	DELAY.9 \
+	deadfs.9 \
 	devclass.9 \
 	devclass_find.9 \
 	devclass_get_device.9 \
diff --git a/share/man/man9/deadfs.9 b/share/man/man9/deadfs.9
new file mode 100644
index 000000000000..5f4d037a0f09
--- /dev/null
+++ b/share/man/man9/deadfs.9
@@ -0,0 +1,36 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2025 Mateusz Piotrowski <0mp@FreeBSD.org>
+.\"
+.Dd October 24, 2025
+.Dt DEADFS 9
+.Os
+.Sh NAME
+.Nm deadfs
+.Nd pseudo-filesystem to own reclaimed vnodes
+.Sh DESCRIPTION
+The
+.Nm
+file system implements operations that do not modify any data
+and instead return indications of invalid IO.
+Its role is to provide a fallback vnode operations vector for reclaimed
+.Xr vnode 9 Ap s .
+.Pp
+It is a kernel-only pseudo-file system and so cannot be mounted from userspace.
+.Sh SEE ALSO
+.Xr insmntque 9 ,
+.Xr vnode 9 ,
+.Xr VOP_RECLAIM 9
+.Sh HISTORY
+UNIX System Manager's Manual (SMM) for
+.Bx 4.4
+described
+.Nm
+as a file system
+.Dq where rejected vnodes go to die .
+.Sh AUTHORS
+The
+.Nm
+manual page was written by
+.An Mateusz Piotrowski Aq Mt 0mp@FreeBSD.org .
diff --git a/share/man/man9/g_bio.9 b/share/man/man9/g_bio.9
index 407c38e6ca70..fc278cd229a9 100644
--- a/share/man/man9/g_bio.9
+++ b/share/man/man9/g_bio.9
@@ -22,7 +22,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd August 7, 2019
+.Dd October 26, 2025
 .Dt G_BIO 9
 .Os
 .Sh NAME
@@ -309,6 +309,7 @@ example_start(struct bio *bp)
 }
 .Ed
 .Sh SEE ALSO
+.Xr dtrace_io 4 ,
 .Xr geom 4 ,
 .Xr DECLARE_GEOM_CLASS 9 ,
 .Xr g_access 9 ,
diff --git a/share/man/man9/uio.9 b/share/man/man9/uio.9
index e6240c4e51d3..b143eb6e8e62 100644
--- a/share/man/man9/uio.9
+++ b/share/man/man9/uio.9
@@ -23,7 +23,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd March 11, 2017
+.Dd October 22, 2025
 .Dt UIO 9
 .Os
 .Sh NAME
@@ -107,10 +107,14 @@ The I/O vector points into the kernel address space.
 Do not copy, already in object.
 .El
 .It Va uio_rw
-The direction of the desired transfer, either
-.Dv UIO_READ
-or
-.Dv UIO_WRITE .
+The direction of the desired transfer.
+The supported flags are:
+.Bl -tag -width "UIO_WRITE"
+.It Dv UIO_READ
+Transfer data from the buffers into the I/O vectors.
+.It Dv UIO_WRITE
+Transfer data from the I/O vectors into the buffers.
+.El
 .It Va uio_td
 The pointer to a
 .Vt "struct thread"