[PATCH 39/79] link_path_walk: don't bother with walk_component() after jumping link

[Al Viro]

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

... it does nothing if nd->last_type is LAST_BIND.

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
 fs/namei.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index ea528ca..d6235ea 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1789,7 +1789,11 @@ static int link_path_walk(const char *name, struct nameidata *nd)
 					return err;
 				}
 				err = 0;
-				if (likely(s)) {
+				if (unlikely(!s)) {
+					/* jumped */
+					put_link(nd, &link, cookie);
+					break;
+				} else {
 					if (*s == '/') {
 						if (!nd->root.mnt)
 							set_root(nd);
@@ -1804,9 +1808,9 @@ static int link_path_walk(const char *name, struct nameidata *nd)
 						put_link(nd, &link, cookie);
 						break;
 					}
+					err = walk_component(nd, LOOKUP_FOLLOW);
+					put_link(nd, &link, cookie);
 				}
-				err = walk_component(nd, LOOKUP_FOLLOW);
-				put_link(nd, &link, cookie);
 			} while (err > 0);
 
 			current->link_count--;
-- 
2.1.4

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