tree c538a12b16e7c2cbd53eff4d07c7116babf96c6f
parent 368ee9ba565d6e13912791b05f3cc1dfa945a62a
author Al Viro <viro@zeniv.linux.org.uk> 1431121027 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1431346377 -0400

namei: lift link_path_walk() call out of trailing_symlink()

Make trailing_symlink() return the pathname to traverse or ERR_PTR(-E...).
A subtle point is that for "magic" symlinks it returns "" now - that
leads to link_path_walk("", nd), which is immediately returning 0 and
we are back to the treatment of the last component, at whereever the
damn thing has left us.

Reduces the stack footprint - link_path_walk() called on more shallow
stack now.

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