linux-kernel - [PATCH 45/79] link_path_walk: split "return from recursive call" path

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Date:	Tue,  5 May 2015 06:22:19 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Neil Brown <neilb@...e.de>, Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 45/79] link_path_walk: split "return from recursive call" path

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

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 40 +++++++++++++++++-----------------------
 1 file changed, 17 insertions(+), 23 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 3c622ad..723dead 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1818,23 +1818,6 @@ Walked:
 				last->name = name;
 				name = s;
 				goto start;
-
-back:
-				name = last->name;
-				if (unlikely(err)) {
-					put_link(nd, &last->link, last->cookie);
-					current->link_count--;
-					nd->depth--;
-					last--;
-					goto Err;
-				} else {
-					err = walk_component(nd, LOOKUP_FOLLOW);
-					put_link(nd, &last->link, last->cookie);
-					current->link_count--;
-					nd->depth--;
-					last--;
-					goto Walked;
-				}
 			}
 		}
 		if (!d_can_lookup(nd->path.dentry)) {
@@ -1844,13 +1827,24 @@ back:
 	}
 	terminate_walk(nd);
 Err:
-	if (likely(!nd->depth))
-		return err;
-	goto back;
+	while (unlikely(nd->depth)) {
+		put_link(nd, &last->link, last->cookie);
+		current->link_count--;
+		nd->depth--;
+		last--;
+	}
+	return err;
 OK:
-	if (likely(!nd->depth))
-		return 0;
-	goto back;
+	if (unlikely(nd->depth)) {
+		name = last->name;
+		err = walk_component(nd, LOOKUP_FOLLOW);
+		put_link(nd, &last->link, last->cookie);
+		current->link_count--;
+		nd->depth--;
+		last--;
+		goto Walked;
+	}
+	return 0;
 }
 
 static int path_init(int dfd, const struct filename *name, unsigned int flags,
-- 
2.1.4

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