How to pass "nonempty" mount option to charybdefs?

[db-vmw]

Hi,
I want to mount the charybdefs on to an existing location. I see the following warning message.

#./charybdefs /var/data-dir -omodules=subdir,subdir=/var/data-dir
starting fuse filesystem
fuse: mountpoint is not empty
fuse: if you are sure this is safe, use the 'nonempty' mount option

I want to use "nonempty" option as documented in the FUSE man page:
https://manpages.ubuntu.com/manpages/xenial/en/man8/mount.fuse.8.html

The "charybdefs" being used for mount seems to be an executable. Please let me know on how to pass "nonempty" as a parameter OR let me know the code to modify to accept the nonempty as a parameter and regenerate the "charybdefs" executable.

Thanks,
Dinesh

[db-vmw]

@bentsi can you please help here?

[bentsi]

./charybdefs /var/data-dir -omodules=subdir,subdir=/var/data-dir -o nonempty
But you should NOT use the same dir for mount and for source. CharybdeFS will get stuck.

[db-vmw]

./charybdefs /var/data-dir -omodules=subdir,subdir=/var/data-dir -o nonempty

Cool. Thanks @bentsi

But you should NOT use the same dir for mount and for source. CharybdeFS will get stuck.

Oh!! Then, what is the way to test latency fault using charybdefs for a directory where application will be keep writing?