import tmpfs code, originally from netbsd.

heavy lifting by Pedro Martelletto, timestamp fixes by me.

THIS IS NOT ENABLED YET, AND REQUIRES UVM CHANGES AND REVIEW.
Imported, so that working on it can be mostly done in tree with less painful
diff exchanges, and that we have history of further changes.

okay tedu@, deraadt@

1 files changed, 123 insertions, 0 deletions

diff --git a/sys/tmpfs/tmpfs_specops.c b/sys/tmpfs/tmpfs_specops.c
new file mode 100644
index 00000000000..939d4a54a3a
--- /dev/null
+++ b/sys/tmpfs/tmpfs_specops.c
@@ -0,0 +1,123 @@
+/*	$NetBSD: tmpfs_specops.c,v 1.10 2011/05/24 20:17:49 rmind 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.
+ *
+ * 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 special devices.
+ */
+
+#if 0
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: tmpfs_specops.c,v 1.10 2011/05/24 20:17:49 rmind Exp $");
+#endif
+
+#include <sys/param.h>
+#include <sys/vnode.h>
+#include <sys/specdev.h>
+#include <tmpfs/tmpfs_vnops.h>
+
+#include <tmpfs/tmpfs.h>
+
+int	tmpfs_spec_close	(void *);
+int	tmpfs_spec_read		(void *);
+int	tmpfs_spec_write	(void *);
+
+/*
+ * vnode operations vector used for special devices stored in a tmpfs
+ * file system.
+ */
+
+struct vops tmpfs_specvops = {
+	.vop_lookup	= vop_generic_lookup,
+	.vop_create	= spec_badop,
+	.vop_mknod	= spec_badop,
+	.vop_open	= spec_badop,
+	.vop_close	= spec_close,
+	.vop_access	= tmpfs_access,
+	.vop_getattr	= tmpfs_getattr,
+	.vop_setattr	= tmpfs_setattr,
+	.vop_read	= tmpfs_spec_read,
+	.vop_write	= tmpfs_spec_write,
+	.vop_ioctl	= spec_ioctl,
+	.vop_poll	= spec_poll,
+	.vop_kqfilter	= spec_kqfilter,
+	.vop_revoke	= vop_generic_revoke,
+	.vop_fsync	= spec_fsync,
+	.vop_remove	= spec_badop,
+	.vop_link	= spec_badop,
+	.vop_rename	= spec_badop,
+	.vop_mkdir	= spec_badop,
+	.vop_rmdir	= spec_badop,
+	.vop_symlink	= spec_badop,
+	.vop_readdir	= spec_badop,
+	.vop_readlink	= spec_badop,
+	.vop_abortop	= spec_badop,
+	.vop_inactive	= tmpfs_inactive,
+	.vop_reclaim	= tmpfs_reclaim,
+	.vop_lock	= tmpfs_lock,
+	.vop_unlock	= tmpfs_unlock,
+	.vop_bmap	= vop_generic_bmap,
+	.vop_strategy	= spec_strategy,
+	.vop_print	= tmpfs_print,
+	.vop_pathconf	= spec_pathconf,
+	.vop_advlock	= spec_advlock,
+	.vop_bwrite	= vop_generic_bwrite,
+};
+
+int
+tmpfs_spec_read(void *v)
+{
+	struct vop_read_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int a_ioflag;
+		kauth_cred_t a_cred;
+	} */ *ap = v;
+	struct vnode *vp = ap->a_vp;
+
+	tmpfs_update(VP_TO_TMPFS_NODE(vp), TMPFS_NODE_ACCESSED);
+	return (spec_read(ap));
+}
+
+int
+tmpfs_spec_write(void *v)
+{
+	struct vop_write_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int a_ioflag;
+		kauth_cred_t a_cred;
+	} */ *ap = v;
+	struct vnode *vp = ap->a_vp;
+
+	tmpfs_update(VP_TO_TMPFS_NODE(vp), TMPFS_NODE_MODIFIED);
+	return (spec_write(ap));
+}