tree 282cf7da6bc3915093df622ebfcd39f44f6fd1cd
parent b2dba1af3c4157040303a76d25216b1713d333d0
author Al Viro <viro@zeniv.linux.org.uk> 1322094889 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1325649156 -0500

vfs: more mnt_parent cleanups

a) mount --move is checking that ->mnt_parent is non-NULL before
looking if that parent happens to be shared; ->mnt_parent is never
NULL and it's not even an misspelled !mnt_has_parent()

b) pivot_root open-codes is_path_reachable(), poorly.

c) so does path_is_under(), while we are at it.

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