vfs_races-2.6-suse.patch

非常经典的一个分布式系统

 fs/dcache.c            |   24 ++++++++++++++++++++----
 include/linux/dcache.h |    2 ++
 2 files changed, 22 insertions(+), 4 deletions(-)

--- linux-2.6.0-test1/fs/dcache.c~vfs_races_2.5.72_rev1	2003-07-24 15:52:47.000000000 +0400
+++ linux-2.6.0-test1-alexey/fs/dcache.c	2003-09-13 16:21:16.000000000 +0400
@@ -212,7 +212,14 @@ int d_invalidate(struct dentry * dentry)
 		spin_unlock(&dcache_lock);
 		return 0;
 	}
-	/*
+
+        /* network invalidation by Lustre */
+	if (dentry->d_flags & DCACHE_LUSTRE_INVALID) {
+		spin_unlock(&dcache_lock);
+		return 0;
+	}
+
+        /*
 	 * Check whether to do a partial shrink_dcache
 	 * to get rid of unused child entries.
 	 */
@@ -1135,14 +1142,23 @@ void d_delete(struct dentry * dentry)
  * 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);
  	entry->d_vfs_flags &= ~DCACHE_UNHASHED;
 	entry->d_bucket = list;
  	hlist_add_head_rcu(&entry->d_hash, list);
-	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 { \
--- linux-2.6.0-test1/include/linux/dcache.h~vfs_races_2.5.72_rev1	2003-09-13 16:21:05.000000000 +0400
+++ linux-2.6.0-test1-alexey/include/linux/dcache.h	2003-09-13 16:21:16.000000000 +0400
@@ -156,6 +156,8 @@ d_iput:		no		no		yes
 
 #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;
 

_