commit 6497d160f6abf8d1082ff1a4efd841118cb1fddd
author Miklos Szeredi <mszeredi@suse.cz> Thu Sep 05 11:44:41 2013 +0200
committer Al Viro <viro@zeniv.linux.org.uk> Thu Sep 05 16:23:53 2013 -0400
tree fc03ca8342fbd7b441198028b9c29cff83533db3
parent 13caa9fb5b4ce040379523037a0ce4ef867ee0c0

sysfs: use check_submounts_and_drop()

Do have_submounts(), shrink_dcache_parent() and d_drop() atomically.

check_submounts_and_drop() can deal with negative dentries and
non-directories as well.

Non-directories can also be mounted on.  And just like directories we don't
want these to disappear with invalidation.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>