tree 23600131f3c0e8fa0d84707ccb19344f14627804
parent 1c8c601a8c0dc59fe64907dcd9d512a3d181ddc7
author Jeff Layton <jlayton@redhat.com> 1371819496 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1372496263 +0400

locks: avoid taking global lock if possible when waking up blocked waiters

Since we always hold the i_lock when inserting a new waiter onto the
fl_block list, we can avoid taking the global lock at all if we find
that it's empty when we go to wake up blocked waiters.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>