From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 8 May 2015 00:32:22 +0000 (-0400)
Subject: namei: make put_link() RCU-safe
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6548fae2eca6b66c7257af6663fdbdf5a50745fd;p=linux-beck.git

namei: make put_link() RCU-safe

very simple - just make path_put() conditional on !RCU.
Note that right now it doesn't get called in RCU mode -
we leave it before getting anything into stack.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/namei.c b/fs/namei.c
index 43034046a0e1..998c3c2c9488 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -750,7 +750,8 @@ static inline void put_link(struct nameidata *nd)
 	struct inode *inode = last->inode;
 	if (last->cookie && inode->i_op->put_link)
 		inode->i_op->put_link(inode, last->cookie);
-	path_put(&last->link);
+	if (!(nd->flags & LOOKUP_RCU))
+		path_put(&last->link);
 }
 
 int sysctl_protected_symlinks __read_mostly = 0;