From a8aa6f4221309f44f49cdd00acce88122f1753f6 Mon Sep 17 00:00:00 2001
From: Marc Dionne <marc.c.dionne@gmail.com>
Date: Sun, 27 Mar 2011 10:59:55 -0400
Subject: [PATCH] Linux: 2.6.39: replace path_lookup with kern_path

path_lookup is no longer available, use kern_path instead.

Reviewed-on: http://gerrit.openafs.org/4360
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 7d162266c4958b22cc45d65e3f204a96c218e5f6)

Change-Id: I1c2aba273d1d597346ecb92f75caed6b6d624454
Reviewed-on: http://gerrit.openafs.org/4371
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
---
 acinclude.m4               |  3 +++
 src/afs/LINUX/osi_compat.h | 31 +++++++++++++++++++++++++++++++
 src/afs/LINUX/osi_misc.c   | 21 +++++++--------------
 3 files changed, 41 insertions(+), 14 deletions(-)

diff --git a/acinclude.m4 b/acinclude.m4
index 51f2f6d2d1..1f3e498122 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -848,6 +848,9 @@ case $AFS_SYSNAME in *_linux* | *_umlinux*)
 		 AC_CHECK_LINUX_FUNC([pagevec_lru_add_file],
 				     [#include <linux/pagevec.h>],
 				     [__pagevec_lru_add_file(NULL);])
+		 AC_CHECK_LINUX_FUNC([path_lookup],
+				     [#include <linux/namei.h>],
+				     [path_lookup(NULL, 0, NULL);])
 		 AC_CHECK_LINUX_FUNC([rcu_read_lock],
 				     [#include <linux/rcupdate.h>],
 				     [rcu_read_lock();])
diff --git a/src/afs/LINUX/osi_compat.h b/src/afs/LINUX/osi_compat.h
index cee3ade6f2..e4f0735a8d 100644
--- a/src/afs/LINUX/osi_compat.h
+++ b/src/afs/LINUX/osi_compat.h
@@ -403,4 +403,35 @@ afs_inode_setattr(struct osi_file *afile, struct iattr *newattrs) {
     return code;
 }
 
+static inline int
+afs_kern_path(char *aname, int flags, struct nameidata *nd, struct path *path) {
+#if defined(HAVE_LINUX_PATH_LOOKUP)
+    return path_lookup(aname, flags, nd);
+#else
+    return kern_path(aname, flags, path);
+#endif
+}
+
+static inline void
+afs_get_dentry_ref(struct nameidata *nd, struct path *path, struct vfsmount **mnt, struct dentry **dpp) {
+#if defined(STRUCT_NAMEIDATA_HAS_PATH)
+# if defined(HAVE_LINUX_PATH_LOOKUP)
+    *dpp = dget(nd->path.dentry);
+    if (mnt)
+	*mnt = mntget(nd->path.mnt);
+    path_put(&nd->path);
+# else
+    *dpp = dget(path->dentry);
+    if (mnt)
+	*mnt = mntget(path->mnt);
+    path_put(path);
+# endif
+#else
+    *dpp = dget(nd->dentry);
+    if (mnt)
+	*mnt = mntget(nd->mnt);
+    path_release(nd);
+#endif
+}
+
 #endif /* AFS_LINUX_OSI_COMPAT_H */
diff --git a/src/afs/LINUX/osi_misc.c b/src/afs/LINUX/osi_misc.c
index 79fa763127..1158304aba 100644
--- a/src/afs/LINUX/osi_misc.c
+++ b/src/afs/LINUX/osi_misc.c
@@ -23,6 +23,8 @@
 #include "afsincludes.h"
 #include "afs/afs_stats.h"
 
+#include "osi_compat.h"
+
 int afs_osicred_initialized = 0;
 afs_ucred_t afs_osi_cred;
 
@@ -58,26 +60,17 @@ osi_lookupname_internal(char *aname, int followlink, struct vfsmount **mnt,
 {
     int code;
     struct nameidata nd;
+    struct path path;
     int flags = LOOKUP_POSITIVE;
     code = ENOENT;
 
     if (followlink)
        flags |= LOOKUP_FOLLOW;
-    code = path_lookup(aname, flags, &nd);
+    code = afs_kern_path(aname, flags, &nd, &path);
+
+    if (!code)
+	afs_get_dentry_ref(&nd, &path, mnt, dpp);
 
-    if (!code) {
-#if defined(STRUCT_NAMEIDATA_HAS_PATH)
-	*dpp = dget(nd.path.dentry);
-        if (mnt)
-	    *mnt = mntget(nd.path.mnt);
-	path_put(&nd.path);
-#else
-	*dpp = dget(nd.dentry);
-        if (mnt)
-           *mnt = mntget(nd.mnt);
-	path_release(&nd);
-#endif
-    }
     return code;
 }