Hi. It has come to my attention that while exfat supports live trim via the discard mount option, it does not implement FITRIM ioctl for fstrim(8). As exfat finally became the R/W cross-platform file-system solution and many flash storages defaulting to exfat, I'd love to see fstrim support added to exfat too. Wentao Wang added FITRIM ioctl for vfat about 2 years ago. I hope that can be a useful reference: Commit f663b5b38fffeb31841f8bfaf0ef87a445b0ffee ("fat: add FITRIM ioctl for FAT file system"). Thanks.