--- dcache.c.orig	Wed Jun 16 00:22:03 2004
+++ dcache.c	Wed Jun 16 01:00:47 2004
@@ -51,6 +51,7 @@
 static unsigned int d_hash_shift;
 static struct list_head *dentry_hashtable;
 static LIST_HEAD(dentry_unused);
+struct semaphore dcache_lru_sem;
 
 /* Statistics gathering. */
 struct dentry_stat_t dentry_stat = {0, 0, 45, 0,};
@@ -381,6 +382,7 @@
 	struct list_head *tmp, *next;
 	struct dentry *dentry;
 
+	down(&dcache_lru_sem);
 	/*
 	 * Pass one ... move the dentries for the specified
 	 * superblock to the most recent end of the unused list.
@@ -416,6 +418,7 @@
 		goto repeat;
 	}
 	spin_unlock(&dcache_lock);
+	up(&dcache_lru_sem);
 }
 
 /*
@@ -548,8 +551,10 @@
 {
 	int found;
 
+	down(&dcache_lru_sem);
 	while ((found = select_parent(parent)) != 0)
 		prune_dcache(found);
+	up(&dcache_lru_sem);
 }
 
 /*
@@ -581,9 +586,11 @@
 	if (!(gfp_mask & __GFP_FS))
 		return 0;
 
+	down(&dcache_lru_sem);
 	count = dentry_stat.nr_unused / priority;
 
 	prune_dcache(count);
+	up(&dcache_lru_sem);
 	return kmem_cache_shrink(dentry_cache);
 }
 
@@ -1247,6 +1254,7 @@
 		d++;
 		i--;
 	} while (i);
+	sema_init(&dcache_lru_sem, 1);
 }
 
 static void init_buffer_head(void * foo, kmem_cache_t * cachep, unsigned long flags)