MFp4: Add tmpfs, an efficient memory file system.

Please note that, this is currently considered as an
experimental feature so there could be some rough
edges.  Consult http://wiki.freebsd.org/TMPFS for
more information.

For now, connect tmpfs to build on i386 and amd64
architectures only.  Please let us know if you have
success with other platforms.

This work was developed by Julio M. Merino Vidal
for NetBSD as a SoC project; Rohit Jalan ported it
from NetBSD to FreeBSD.  Howard Su and Glen Leeder
are worked on it to continue this effort.

Obtained from:	NetBSD via p4
Submitted by:	Howard Su (with some minor changes)
Approved by:	re (kensmith)

1 files changed, 106 insertions, 0 deletions

diff --git a/sys/fs/tmpfs/tmpfs_fifoops.c b/sys/fs/tmpfs/tmpfs_fifoops.c
new file mode 100644
index 0000000..2ce15d2
--- /dev/null
+++ b/sys/fs/tmpfs/tmpfs_fifoops.c
@@ -0,0 +1,106 @@
+/*	$NetBSD: tmpfs_fifoops.c,v 1.5 2005/12/11 12:24:29 christos Exp $	*/
+
+/*
+ * Copyright (c) 2005 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
+ * 2005 program.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * tmpfs vnode interface for named pipes.
+ */
+#include <sys/cdefs.h>
+ __FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/filedesc.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+
+#include <vm/vm.h>
+#include <vm/vm_object.h>
+
+#include <fs/tmpfs/tmpfs.h>
+#include <fs/tmpfs/tmpfs_fifoops.h>
+#include <fs/tmpfs/tmpfs_vnops.h>
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * vnode operations vector used for fifos stored in a tmpfs file system.
+ */
+struct vop_vector tmpfs_fifoop_entries = {
+	.vop_default =			&fifo_specops,
+	.vop_close =			tmpfs_fifo_close,
+	.vop_reclaim =			tmpfs_reclaim,
+	.vop_access =			tmpfs_access,
+	.vop_getattr = 			tmpfs_getattr,
+	.vop_setattr = 			tmpfs_setattr,
+	.vop_kqfilter =			tmpfs_fifo_kqfilter,
+};
+
+
+int
+tmpfs_fifo_kqfilter(struct vop_kqfilter_args *ap)
+{
+	struct vnode *vp;
+	struct tmpfs_node *node;
+
+	vp = ap->a_vp;
+	node = VP_TO_TMPFS_NODE(vp);
+
+	switch (ap->a_kn->kn_filter){
+	case EVFILT_READ:
+		node->tn_status |= TMPFS_NODE_ACCESSED;		
+		break;
+	case EVFILT_WRITE:
+		node->tn_status |= TMPFS_NODE_MODIFIED;
+		break;
+	}
+	
+	return fifo_specops.vop_kqfilter(ap);
+}
+
+/* --------------------------------------------------------------------- */
+
+int
+tmpfs_fifo_close(struct vop_close_args *v)
+{
+	struct tmpfs_node *node;
+	node = VP_TO_TMPFS_NODE(v->a_vp);
+	node->tn_status |= TMPFS_NODE_ACCESSED;
+	
+	tmpfs_update(v->a_vp);
+	return fifo_specops.vop_close(v);
+}