linux-kernel - [PATCH v3 077/110] namei: simplify failure exits in get

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Message-Id: <1431367690-5223-77-git-send-email-viro@ZenIV.linux.org.uk>
Date:	Mon, 11 May 2015 19:07:37 +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 077/110] namei: simplify failure exits in get_link()

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

when cookie is NULL, put_link() is equivalent to path_put(), so
as soon as we'd set last->cookie to NULL, we can bump nd->depth and
let the normal logics in terminate_walk() to take care of cleanups.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index f311f03..678aeef 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -904,27 +904,23 @@ const char *get_link(struct nameidata *nd)
 
 	last->link = nd->link;
 	last->cookie = NULL;
+	nd->depth++;
 
 	cond_resched();
 
 	touch_atime(&last->link);
 
 	error = security_inode_follow_link(dentry);
-	res = ERR_PTR(error);
 	if (error)
-		goto out;
+		return ERR_PTR(error);
 
 	nd->last_type = LAST_BIND;
 	res = inode->i_link;
 	if (!res) {
 		res = inode->i_op->follow_link(dentry, &last->cookie);
-		if (IS_ERR(res)) {
-out:
-			path_put(&last->link);
-			return res;
-		}
+		if (IS_ERR_OR_NULL(res))
+			last->cookie = NULL;
 	}
-	nd->depth++;
 	return res;
 }
 
-- 
2.1.4

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