D53334.1777392584.diff
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	diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
	--- a/share/man/man9/Makefile
	+++ b/share/man/man9/Makefile
	@@ -90,6 +90,7 @@
	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
	--- /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 vnods go to die .
	+.Sh AUTHORS
	+The
	+.Nm
	+manual page was written by
	+.An Mateusz Piotrowski Aq Mt 0mp@FreeBSD.org .