svn commit: r192167 - user/kmacy/ZFS_MFC/sys/cddl/compat/opensolaris/kern

[Kip Macy]

Author: kmacy
Date: Fri May 15 23:11:06 2009
New Revision: 192167
URL: http://svn.freebsd.org/changeset/base/192167

Log:
  consolidate lookup functions

Added:
  user/kmacy/ZFS_MFC/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c   (contents, props changed)

Added: user/kmacy/ZFS_MFC/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/kmacy/ZFS_MFC/sys/cddl/compat/opensolaris/kern/opensolaris_lookup.c	Fri May 15 23:11:06 2009	(r192167)
@@ -0,0 +1,111 @@
+/*-
+ * Copyright (c) 2007 Pawel Jakub Dawidek <pjd at FreeBSD.org>
+ * 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, 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 AUTHORS 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 AUTHORS 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+ 
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/pathname.h>
+#include <sys/vfs.h>
+#include <sys/vnode.h>
+
+int
+lookupname(char *dirname, enum uio_seg seg, enum symfollow follow,
+    vnode_t **dirvpp, vnode_t **compvpp)
+{
+
+	return (lookupnameat(dirname, seg, follow, dirvpp, compvpp, NULL));
+}
+
+int
+lookupnameat(char *dirname, enum uio_seg seg, enum symfollow follow,
+    vnode_t **dirvpp, vnode_t **compvpp, vnode_t *startvp)
+{
+	struct nameidata nd;
+	int error, ltype;
+
+	ASSERT(dirvpp == NULL);
+
+	vref(startvp);
+	ltype = VOP_ISLOCKED(startvp, curthread);
+	VOP_UNLOCK(startvp, 0, curthread);
+	NDINIT_ATVP(&nd, LOOKUP, LOCKLEAF | MPSAFE | follow, seg, dirname,
+	    startvp, curthread);
+	error = namei(&nd);
+	*compvpp = nd.ni_vp;
+	NDFREE(&nd, NDF_ONLY_PNBUF);
+	vn_lock(startvp, ltype | LK_RETRY, curthread);
+	return (error);
+}
+
+int
+traverse(vnode_t **cvpp, int lktype)
+{
+	vnode_t *cvp;
+	vnode_t *tvp;
+	vfs_t *vfsp;
+	int error;
+
+	cvp = *cvpp;
+	tvp = NULL;
+
+	/*
+	 * If this vnode is mounted on, then we transparently indirect
+	 * to the vnode which is the root of the mounted file system.
+	 * Before we do this we must check that an unmount is not in
+	 * progress on this vnode.
+	 */
+
+	for (;;) {
+		/*
+		 * Reached the end of the mount chain?
+		 */
+		vfsp = vn_mountedvfs(cvp);
+		if (vfsp == NULL)
+			break;
+		/*
+		 * tvp is NULL for *cvpp vnode, which we can't unlock.
+		 */
+		if (tvp != NULL)
+			vput(cvp);
+		else
+			vrele(cvp);
+
+		/*
+		 * The read lock must be held across the call to VFS_ROOT() to
+		 * prevent a concurrent unmount from destroying the vfs.
+		 */
+		error = VFS_ROOT(vfsp, lktype, &tvp, curthread);
+		if (error != 0)
+			return (error);
+		cvp = tvp;
+	}
+
+	*cvpp = cvp;
+	return (0);
+}