[PATCH v3 108/110] enable passing fast relative symlinks without dropping out of RCU mode

[Al Viro]

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
 fs/namei.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 9ef8c50..1771143 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -967,10 +967,6 @@ const char *get_link(struct nameidata *nd)
 	}
 
 	_cond_resched();
-	if (nd->flags & LOOKUP_RCU) {
-		if (unlikely(unlazy_walk(nd, NULL, 0)))
-			return ERR_PTR(-ECHILD);
-	}
 
 	error = security_inode_follow_link(dentry, inode,
 					   nd->flags & LOOKUP_RCU);
@@ -980,6 +976,10 @@ const char *get_link(struct nameidata *nd)
 	nd->last_type = LAST_BIND;
 	res = inode->i_link;
 	if (!res) {
+		if (nd->flags & LOOKUP_RCU) {
+			if (unlikely(unlazy_walk(nd, NULL, 0)))
+				return ERR_PTR(-ECHILD);
+		}
 		res = inode->i_op->follow_link(dentry, &last->cookie);
 		if (IS_ERR_OR_NULL(res)) {
 			last->cookie = NULL;
@@ -987,6 +987,10 @@ const char *get_link(struct nameidata *nd)
 		}
 	}
 	if (*res == '/') {
+		if (nd->flags & LOOKUP_RCU) {
+			if (unlikely(unlazy_walk(nd, NULL, 0)))
+				return ERR_PTR(-ECHILD);
+		}
 		if (!nd->root.mnt)
 			set_root(nd);
 		path_put(&nd->path);
-- 
2.1.4

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