From 939724df56db970bdbaf8abcdc975c51482aba9b Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 3 May 2015 21:21:44 -0400 Subject: [PATCH] link_path_walk: nd->depth massage, part 10 Get rid of orig_depth checks in OK: logics. If nd->depth is zero, we had been called from path_init() and we are done. If it is greater than 1, we are not done, whether we'd been called from path_init() or trailing_symlink(). And in case when it's 1, we might have been called from path_init() and reached the end of nested symlink (in which case nd->stack[0].name will point to the rest of pathname and we are not done) or from trailing_symlink(), in which case we are done. Just have trailing_symlink() leave NULL in nd->stack[0].name and use that to discriminate between those cases. Signed-off-by: Al Viro --- fs/namei.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index bc6d67e1b00e..6febe251b242 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1872,13 +1872,15 @@ Err: put_link(nd); return err; OK: - if (unlikely(nd->depth > orig_depth)) { - name = nd->stack[nd->depth - 1].name; - err = walk_component(nd, LOOKUP_FOLLOW); - put_link(nd); - goto Walked; - } - return 0; + if (!nd->depth) /* called from path_init(), done */ + return 0; + name = nd->stack[nd->depth - 1].name; + if (!name) /* called from trailing_symlink(), done */ + return 0; + + err = walk_component(nd, LOOKUP_FOLLOW); + put_link(nd); + goto Walked; } static int path_init(int dfd, const struct filename *name, unsigned int flags, @@ -2014,6 +2016,7 @@ static int trailing_symlink(struct nameidata *nd) nd->flags |= LOOKUP_JUMPED; } nd->inode = nd->path.dentry->d_inode; + nd->stack[0].name = NULL; error = link_path_walk(s, nd); if (unlikely(error)) put_link(nd); -- 2.20.1