Create a file in bbssd in FTL

[PolarSu]

Sorry I have some questions ,
I run FEMU in black-box mode , and I create a large file in /dev/nvme0n1 (e.g. 2GB)
In ftl.c , I think "ssdparam" struct will allocate 2GB space to support it , and then I try to trace it , so I print get_tbl_ent() ppa . But it looks like allocate not enough space .
How do I know the system is already allocated enough space that I create?

Theoretically, I think I create 2G file twice (create-delete-create), it should go to do_gc() in ftl.c (suppose /dev/nvme0n1 is 4GB , I think created total more than 4GB will do gc) ,but it doesn't.

How can I trigger the do_gc() with allocate about full space?

Thanks for it!