This patch is needed to allow sharing the kernel with 1.8, and until
the MGS and llog code has been moved over to using the OSD interface.

Index: linux-2.6.22.5/fs/dcache.c
===================================================================
--- linux-2.6.22.5.orig/fs/dcache.c	2008-02-21 00:56:29.000000000 -0700
+++ linux-2.6.22.5/fs/dcache.c	2008-02-21 00:57:02.000000000 -0700
@@ -1441,13 +1441,22 @@
  * Adds a dentry to the hash according to its name.
  */
  
-void d_rehash(struct dentry * entry)
+void d_rehash_cond(struct dentry * entry, int lock)
 {
-	spin_lock(&dcache_lock);
+	if (lock)
+		spin_lock(&dcache_lock);
 	spin_lock(&entry->d_lock);
 	_d_rehash(entry);
 	spin_unlock(&entry->d_lock);
-	spin_unlock(&dcache_lock);
+	if (lock)
+		spin_unlock(&dcache_lock);
+}
+
+EXPORT_SYMBOL(d_rehash_cond);
+
+void d_rehash(struct dentry * entry)
+{
+	d_rehash_cond(entry, 1);
 }
 
 #define do_switch(x,y) do { \
@@ -1537,7 +1546,7 @@
  * Update the dcache to reflect the move of a file name. Negative
  * dcache entries should not be moved in this way.
  */
-static void d_move_locked(struct dentry * dentry, struct dentry * target)
+void d_move_locked(struct dentry * dentry, struct dentry * target)
 {
 	struct hlist_head *list;
 
@@ -1595,6 +1604,7 @@
 	spin_unlock(&dentry->d_lock);
 	write_sequnlock(&rename_lock);
 }
+EXPORT_SYMBOL(d_move_locked);
 
 /**
  * d_move - move a dentry
Index: linux-2.6.22.5/include/linux/dcache.h
===================================================================
--- linux-2.6.22.5.orig/include/linux/dcache.h	2008-02-21 00:56:29.000000000 -0700
+++ linux-2.6.22.5/include/linux/dcache.h	2008-02-21 00:57:02.000000000 -0700
@@ -251,6 +251,7 @@ extern int have_submounts(struct dentry 
  * This adds the entry to the hash queues.
  */
 extern void d_rehash(struct dentry *);
+extern void d_rehash_cond(struct dentry *, int lock);
 
 /**
  * d_add - add dentry to hash queues
@@ -286,6 +287,7 @@ static inline struct dentry *d_add_uniqu
 
 /* used for rename() and baskets */
 extern void d_move(struct dentry *, struct dentry *);
+extern void d_move_locked(struct dentry *, struct dentry *);
 
 /* appendix may either be NULL or be used for transname suffixes */
 extern struct dentry * d_lookup(struct dentry *, struct qstr *);