tree 89e932ac7aa4c3b27f5a138247bc72555ec2ea6d
parent 0fe56f75a745cad9da4e3d9313bb611e175070cf
author Oleg Nesterov <oleg@redhat.com> 1389464393 +0100
committer Al Viro <viro@zeniv.linux.org.uk> 1389656621 -0500

change close_files() to use rcu_dereference_raw(files->fdt)

put_files_struct() and close_files() do rcu_read_lock() to make
rcu_dereference_check_fdtable() happy.

This looks a bit ugly, files_fdtable() just reads the pointer,
we can simply use rcu_dereference_raw() to avoid the warning.

The patch also changes close_files() to return fdt, this avoids
another rcu_read_lock()/files_fdtable() in put_files_struct().

I think close_files() needs more cleanups:

	- we do not need xchg() exactly because we are the last
	  user of this files_struct

	- "if (file)" should be turned into WARN_ON(!file)

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>