Rename struct file->f_ep_lock

This lock moves out of the CONFIG_EPOLL ifdef and becomes f_lock.  For now,
epoll remains the only user, but a future patch will use it to protect
f_flags as well.

Cc: Davide Libenzi <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
4 files changed