linux-kernel - [PATCH v3 062/110] link_path_walk: end of nd->depth massage

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Date:	Mon, 11 May 2015 19:07:22 +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 062/110] link_path_walk: end of nd->depth massage

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

get rid of orig_depth - we only use it on error exit to tell whether
to stop doing put_link() when depth reaches 0 (call from path_init())
or when it reaches 1 (call from trailing_symlink()).  However, in
the latter case the caller would immediately follow with one more
put_link().  Just keep doing it until the depth reaches zero (and
simplify trailing_symlink() as the result).

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 6febe25..d12b16c 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1759,7 +1759,6 @@ 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++;
@@ -1868,7 +1867,7 @@ Walked:
 	}
 	terminate_walk(nd);
 Err:
-	while (unlikely(nd->depth > orig_depth))
+	while (unlikely(nd->depth))
 		put_link(nd);
 	return err;
 OK:
@@ -2017,10 +2016,7 @@ static int trailing_symlink(struct nameidata *nd)
 	}
 	nd->inode = nd->path.dentry->d_inode;
 	nd->stack[0].name = NULL;
-	error = link_path_walk(s, nd);
-	if (unlikely(error))
-		put_link(nd);
-	return error;
+	return link_path_walk(s, nd);
 }
 
 static inline int lookup_last(struct nameidata *nd)
-- 
2.1.4

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