vfs_intent-reduce-stack-usage-2.6-suse-newer.patch

非常经典的一个分布式系统

---
 fs/namei.c            |    5 +----
 include/linux/namei.h |    7 +++++++
 2 files changed, 8 insertions(+), 4 deletions(-)

--- linux-2.6.5-7.282.orig/fs/namei.c
+++ linux-2.6.5-7.282/fs/namei.c
@@ -2369,7 +2369,6 @@ static inline int
 __vfs_follow_link(struct nameidata *nd, const char *link)
 {
 	int res = 0;
-	struct lookup_intent it = nd->intent;
 	char *name;
 
 	if (IS_ERR(link))
@@ -2382,9 +2381,7 @@ __vfs_follow_link(struct nameidata *nd, 
 			goto out;
 	}
 
-	intent_init(&nd->intent, it.it_op);
-	nd->intent.it_flags = it.it_flags;
-	nd->intent.it_create_mode = it.it_create_mode;
+	intent_reset_fs_part(&nd->intent);
 	res = link_path_walk(link, nd);
 out:
 	if (current->link_count || res || nd->last_type!=LAST_NORM)
--- linux-2.6.5-7.282.orig/include/linux/namei.h
+++ linux-2.6.5-7.282/include/linux/namei.h
@@ -37,6 +37,13 @@ struct lookup_intent {
 	} d;
 };
 
+static inline void intent_reset_fs_part(struct lookup_intent *it)
+{
+        memset(&it->d, 0, sizeof(it->d));
+        it->it_magic = INTENT_MAGIC;
+        it->it_op_release = NULL;
+}
+
 static inline void intent_init(struct lookup_intent *it, int op)
 {
 	memset(it, 0, sizeof(*it));