Remove the support for using non-mpsafe filesystem modules.

In particular, do not lock Giant conditionally when calling into the
filesystem module, remove the VFS_LOCK_GIANT() and related
macros. Stop handling buffers belonging to non-mpsafe filesystems.

The VFS_VERSION is bumped to indicate the interface change which does
not result in the interface signatures changes.

Conducted and reviewed by:	attilio
Tested by:	pho

3 files changed, 0 insertions, 109 deletions

diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
index ad9e453..dc7a1dd 100644
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -280,7 +280,6 @@ MAN=	accept_filter.9 \
 	vfs_getnewfsid.9 \
 	vfs_getopt.9 \
 	vfs_getvfs.9 \
-	VFS_LOCK_GIANT.9 \
 	VFS_MOUNT.9 \
 	vfs_mount.9 \
 	vfs_mountedfrom.9 \
@@ -1413,7 +1412,6 @@ MLINKS+=vfs_getopt.9 vfs_copyopt.9 \
 	vfs_getopt.9 vfs_setopt.9 \
 	vfs_getopt.9 vfs_setopt_part.9 \
 	vfs_getopt.9 vfs_setopts.9
-MLINKS+=VFS_LOCK_GIANT.9 VFS_UNLOCK_GIANT.9
 MLINKS+=vhold.9 vdrop.9 \
 	vhold.9 vdropl.9 \
 	vhold.9 vholdl.9
diff --git a/share/man/man9/VFS_LOCK_GIANT.9 b/share/man/man9/VFS_LOCK_GIANT.9
deleted file mode 100644
index 9249e6c..0000000
--- a/share/man/man9/VFS_LOCK_GIANT.9
+++ /dev/null
@@ -1,93 +0,0 @@
-.\"
-.\" Copyright (c) 2005 Robert N. M. Watson
-.\" 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(s), this list of conditions and the following disclaimer as
-.\"    the first lines of this file unmodified other than the possible
-.\"    addition of one or more copyright notices.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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 September 21, 2005
-.Dt VFS_LOCK_GIANT 9
-.Os
-.Sh NAME
-.Nm VFS_LOCK_GIANT ,
-.Nm VFS_UNLOCK_GIANT
-.Nd "conditionally lock and unlock Giant around entry into VFS"
-.Sh SYNOPSIS
-.In sys/param.h
-.In sys/mount.h
-.In sys/vnode.h
-.Ft int
-.Fn VFS_LOCK_GIANT "struct mount *mp"
-.Ft void
-.Fn VFS_UNLOCK_GIANT "int vfslocked"
-.Sh DESCRIPTION
-.Fn VFS_LOCK_GIANT
-will conditionally acquire the
-.Va Giant
-lock if the file system referenced by
-.Fa mp
-is marked as MPSAFE or not, returning a flag indicating whether
-.Va Giant
-was
-set, which may later be passed to
-.Fn VFS_UNLOCK_GIANT .
-The value of
-.Fa mp
-will typically be derived from the mount pointer in a
-.Vt vnode
-on which a VFS operation will be performed.
-.Pp
-.Fn VFS_UNLOCK_GIANT
-conditionally releases the
-.Va Giant
-lock if the passed
-.Fa vfslocked
-argument is non-zero.
-It is expected that the argument will be derived from the return values of
-.Fn VFS_LOCK_GIANT
-or
-.Xr NDHASGIANT 9 .
-.Sh RETURN VALUES
-.Fn VFS_LOCK_GIANT
-returns a boolean indicating whether or not
-.Va Giant
-was acquired.
-.Sh SEE ALSO
-.Xr mutex 9 ,
-.Xr NDHASGIANT 9 ,
-.Xr vnode 9
-.Sh AUTHORS
-.An -nosplit
-MPSAFE VFS support for
-.Fx
-was implemented by
-.An Jeff Roberson .
-.Pp
-This manual page was written by
-.An Robert Watson .
-.Sh BUGS
-Non-MPSAFE file systems exist, requiring callers conditional locking and
-unlocking of
-.Va Giant .
diff --git a/share/man/man9/namei.9 b/share/man/man9/namei.9
index dc9ef8e..95c20a3 100644
--- a/share/man/man9/namei.9
+++ b/share/man/man9/namei.9
@@ -168,19 +168,6 @@ This flag allows the
 function to return the parent (directory) vnode in an unlocked state.
 The parent vnode must be released separately by using
 .Xr vrele 9 .
-.It Dv MPSAFE
-With this flag set,
-.Fn namei
-will conditionally acquire
-.Va Giant
-if it is required by a traversed file system.
-MPSAFE callers should pass the results of
-.Fn NDHASGIANT
-to
-.Xr VFS_UNLOCK_GIANT
-in order to conditionally release
-.Va Giant
-if necessary.
 .It Dv NOCACHE
 Avoid
 .Fn namei
@@ -354,7 +341,6 @@ An attempt is made to modify a file or directory on a read-only file system.
 .Xr uio 9 ,
 .Xr uma 9 ,
 .Xr VFS 9 ,
-.Xr VFS_UNLOCK_GIANT 9 ,
 .Xr vnode 9 ,
 .Xr vput 9 ,
 .Xr vref 9