linux-kernel - [PATCH v3 060/110] link_path_walk: nd->depth massage, part 9

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Message-Id: <1431367690-5223-60-git-send-email-viro@ZenIV.linux.org.uk>
Date:	Mon, 11 May 2015 19:07:20 +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 v3 060/110] link_path_walk: nd->depth massage, part 9

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

Make link_path_walk() work with any value of nd->depth on entry -
memorize it and use it in tests instead of comparing with 1.
Don't bother with increment/decrement in path_init().

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 1f61955..bc6d67e 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1759,6 +1759,7 @@ static inline u64 hash_name(const char *name)
 static int link_path_walk(const char *name, struct nameidata *nd)
 {
 	int err;
+	int orig_depth = nd->depth;
 
 	while (*name=='/')
 		name++;
@@ -1867,11 +1868,11 @@ Walked:
 	}
 	terminate_walk(nd);
 Err:
-	while (unlikely(nd->depth > 1))
+	while (unlikely(nd->depth > orig_depth))
 		put_link(nd);
 	return err;
 OK:
-	if (unlikely(nd->depth > 1)) {
+	if (unlikely(nd->depth > orig_depth)) {
 		name = nd->stack[nd->depth - 1].name;
 		err = walk_component(nd, LOOKUP_FOLLOW);
 		put_link(nd);
@@ -1979,10 +1980,7 @@ static int path_init(int dfd, const struct filename *name, unsigned int flags,
 	return -ECHILD;
 done:
 	current->total_link_count = 0;
-	nd->depth++;
-	retval = link_path_walk(s, nd);
-	nd->depth--;
-	return retval;
+	return link_path_walk(s, nd);
 }
 
 static void path_cleanup(struct nameidata *nd)
-- 
2.1.4

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