Commit 43679723 authored Jan 14, 2020 by Al Viro

merging pick_link() with get_link(), part 1



Move restoring LOOKUP_PARENT and zeroing nd->stack.name[0] past
the call of get_link() (nothing _currently_ uses them in there).
That allows to moved the call of may_follow_link() into get_link()
as well, since now the presence of LOOKUP_PARENT distinguishes
the callers from each other (link_path_walk() has it, trailing_symlink()
doesn't).

Preparations for folding trailing_symlink() into callers (lookup_last()
and do_last()) and changing the calling conventions of those.  Next
stage after that will have get_link() call migrate into walk_component(),
then - into step_into().  It's tricky enough to warrant doing that
in stages, unfortunately...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

parent a9dc1494

fs/namei.c

+7 −5

Original line number	Diff line number	Diff line
		@@ -1115,6 +1115,12 @@ const char get_link(struct nameidata nd)
		int error;
		const char *res;

		if (!(nd->flags & LOOKUP_PARENT)) {
		error = may_follow_link(nd);
		if (unlikely(error))
		return ERR_PTR(error);
		}

		if (unlikely(nd->flags & LOOKUP_NO_SYMLINKS))
		return ERR_PTR(-ELOOP);

		@@ -2329,13 +2335,9 @@ static const char path_init(struct nameidata nd, unsigned flags)

		static const char trailing_symlink(struct nameidata nd)
		{
		const char *s;
		int error = may_follow_link(nd);
		if (unlikely(error))
		return ERR_PTR(error);
		const char *s = get_link(nd);
		nd->flags \|= LOOKUP_PARENT;
		nd->stack[0].name = NULL;
		s = get_link(nd);
		return s ? s : "";
		}