fsnotify: disable pre-content and permission events by default

After introducing pre-content events, we had a regression related to
disabling huge faults on files that should never have pre-content events
enabled.

This happened because the default f_mode of allocated files (0) does
not disable pre-content events.

Pre-content events are disabled in file_set_fsnotify_mode_by_watchers()
but internal files may not get to call this helper.

Initialize f_mode to disable permission and pre-content events for all
files and if needed they will be enabled for the callers of
file_set_fsnotify_mode_by_watchers().

Fixes: 20bf82a8 ("mm: don't allow huge faults for files with pre content watches")
Reported-by: Alex Williamson <alex.williamson@redhat.com>
Closes: https://lore.kernel.org/linux-fsdevel/20250131121703.1e4d00a7.alex.williamson@redhat.com/


Tested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20250203223205.861346-4-amir73il@gmail.com


Signed-off-by: Christian Brauner <brauner@kernel.org>