fuse: serialize dirops by default

Negotiate with userspace filesystems whether they support parallel readdir
and lookup.  Disable parallelism by default for fear of breaking fuse
filesystems.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 9902af79c01a ("parallel lookups: actual switch to rwsem")
Fixes: d9b3dbdcfd62 ("fuse: switch to ->iterate_shared()")

path: root/sig.h

#ifndef SIG_H
#define SIG_H

extern void register_signal(int signal, void (*handler)(int));
extern void register_signal_f(int signal, void (*handler)(int), int flags);

#endif /* SIG_H */