vfs_races-2.6-fc3.patch

非常经典的一个分布式系统

Index: linux-2.6.11/fs/dcache.c
===================================================================
--- linux-2.6.11.orig/fs/dcache.c	2005-04-13 22:44:37.698760922 -0400
+++ linux-2.6.11/fs/dcache.c	2005-04-13 22:44:50.482498026 -0400
@@ -1183,7 +1183,7 @@
 	spin_unlock(&dcache_lock);
 }
 
-static void __d_rehash(struct dentry * entry, struct hlist_head *list)
+static void __d_rehash_internal(struct dentry * entry, struct hlist_head *list)
 {
 
  	entry->d_flags &= ~DCACHE_UNHASHED;
@@ -1197,15 +1197,24 @@
  * Adds a dentry to the hash according to its name.
  */
  
-void d_rehash(struct dentry * entry)
+void __d_rehash(struct dentry * entry, int lock)
 {
 	struct hlist_head *list = d_hash(entry->d_parent, entry->d_name.hash);
 
-	spin_lock(&dcache_lock);
+	if (lock)
+		spin_lock(&dcache_lock);
 	spin_lock(&entry->d_lock);
-	__d_rehash(entry, list);
+	__d_rehash_internal(entry, list);
 	spin_unlock(&entry->d_lock);
-	spin_unlock(&dcache_lock);
+	if (lock)
+		spin_unlock(&dcache_lock);
+}
+
+EXPORT_SYMBOL(__d_rehash);
+
+void d_rehash(struct dentry * entry)
+{
+	__d_rehash(entry, 1);
 }
 
 #define do_switch(x,y) do { \
@@ -1308,7 +1317,7 @@
 
 already_unhashed:
 	list = d_hash(target->d_parent, target->d_name.hash);
-	__d_rehash(dentry, list);
+	__d_rehash_internal(dentry, list);
 
 	/* Unhash the target: dput() will then get rid of it */
 	__d_drop(target);
Index: linux-2.6.11/include/linux/dcache.h
===================================================================
--- linux-2.6.11.orig/include/linux/dcache.h	2005-04-13 22:35:23.515178600 -0400
+++ linux-2.6.11/include/linux/dcache.h	2005-04-13 22:44:43.188221365 -0400
@@ -159,6 +159,8 @@
 
 #define DCACHE_REFERENCED	0x0008  /* Recently used, don't discard. */
 #define DCACHE_UNHASHED		0x0010	
+#define DCACHE_LUSTRE_INVALID     0x0020  /* Lustre invalidated */
+
 
 extern spinlock_t dcache_lock;