The inotify_add_watch generates wd-s one-by one. We cannot
request for one, thus we call this syscall till the required
wd is generated.

Thus, if we want to restore several wd-s for an inotify, we
have to put them in ascending order. Otherwise we may restore
watch with higher wd earlier and will thus not be able to
generate the lower wd in a reasonable time.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>