linux-kernel - [PATCH 09/24] namei: fold follow_link() into link_path

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Message-Id: <1429553588-24764-9-git-send-email-viro@ZenIV.linux.org.uk>
Date:	Mon, 20 Apr 2015 19:12:53 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Neil Brown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: [PATCH 09/24] namei: fold follow_link() into link_path_walk()

From: Al Viro <viro@...iv.linux.org.uk>

... and strip __always_inline from follow_link() - remaining callers
don't need that.

Now link_path_walk() recursion is a direct one.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index e07bf5c..48b2f17 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -920,8 +920,7 @@ out:
 	return res;
 }
 
-static __always_inline int
-follow_link(struct path *link, struct nameidata *nd, void **p)
+static int follow_link(struct path *link, struct nameidata *nd, void **p)
 {
 	char *s = get_link(link, nd, p);
 	int error;
@@ -1846,10 +1845,29 @@ static int link_path_walk(const char *name, struct nameidata *nd)
 			do {
 				struct path link = next;
 				void *cookie;
+				char *s = get_link(&link, nd, &cookie);
 
-				err = follow_link(&link, nd, &cookie);
-				if (err)
+				if (unlikely(IS_ERR(s))) {
+					err = PTR_ERR(s);
 					break;
+				}
+				err = 0;
+				if (likely(s)) {
+					if (*s == '/') {
+						if (!nd->root.mnt)
+							set_root(nd);
+						path_put(&nd->path);
+						nd->path = nd->root;
+						path_get(&nd->root);
+						nd->flags |= LOOKUP_JUMPED;
+					}
+					nd->inode = nd->path.dentry->d_inode;
+					err = link_path_walk(s, nd);
+					if (unlikely(err)) {
+						put_link(nd, &link, cookie);
+						break;
+					}
+				}
 				err = walk_component(nd, &next, LOOKUP_FOLLOW);
 				put_link(nd, &link, cookie);
 			} while (err > 0);
-- 
2.1.4

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