tree 3369bcbe414738d90e6ccfe257f6ce3e72f6a5ae
parent ad47bd7252bf402fe7dba92f5240b5ed16832ae7
author Al Viro <viro@zeniv.linux.org.uk> 1345602726 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1348708199 -0400

new helper: iterate_fd()

iterates through the opened files in given descriptor table,
calling a supplied function; we stop once non-zero is returned.
Callback gets struct file *, descriptor number and const void *
argument passed to iterator.  It is called with files->file_lock
held, so it is not allowed to block.

tty_io, netprio_cgroup and selinux flush_unauthorized_files()
converted to its use.

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