linux-kernel - [RFC][PATCH v3 27/55] pick_link(): check for WALK_TRAILING, not LOOKUP

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Message-Id: <20200301215240.873899-27-viro@ZenIV.linux.org.uk>
Date:   Sun,  1 Mar 2020 21:52:12 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [RFC][PATCH v3 27/55] pick_link(): check for WALK_TRAILING, not LOOKUP_PARENT

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

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namei.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index f994ed10ef39..56bbbb9c0c0d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1723,8 +1723,10 @@ static inline int handle_dots(struct nameidata *nd, int type)
 	return 0;
 }
 
+enum {WALK_TRAILING = 1, WALK_MORE = 2, WALK_NOFOLLOW = 4};
+
 static const char *pick_link(struct nameidata *nd, struct path *link,
-		     struct inode *inode, unsigned seq)
+		     struct inode *inode, unsigned seq, int flags)
 {
 	struct saved *last;
 	const char *res;
@@ -1762,7 +1764,7 @@ static const char *pick_link(struct nameidata *nd, struct path *link,
 	clear_delayed_call(&last->done);
 	last->seq = seq;
 
-	if (!(nd->flags & LOOKUP_PARENT)) {
+	if (flags & WALK_TRAILING) {
 		error = may_follow_link(nd, inode);
 		if (unlikely(error))
 			return ERR_PTR(error);
@@ -1819,8 +1821,6 @@ static const char *pick_link(struct nameidata *nd, struct path *link,
 	return NULL;
 }
 
-enum {WALK_TRAILING = 1, WALK_MORE = 2, WALK_NOFOLLOW = 4};
-
 /*
  * Do we need to follow links? We _really_ want to be able
  * to do this check without having to look at inode->i_op,
@@ -1851,7 +1851,7 @@ static const char *step_into(struct nameidata *nd, int flags,
 		if (read_seqcount_retry(&path.dentry->d_seq, seq))
 			return ERR_PTR(-ECHILD);
 	}
-	return pick_link(nd, &path, inode, seq);
+	return pick_link(nd, &path, inode, seq, flags);
 }
 
 static const char *walk_component(struct nameidata *nd, int flags)
-- 
2.11.0