Currently, FUSE in the kernel part does not support quotas. If users want to implement quota functionality with FUSE, they can only achieve this at the user level using the underlying file system features. However, if the underlying file system, such as btrfs, does not support UID/GID level quotas and only support subvolume level quota, users will need to find alternative methods to implement quota functionality. And consider another scenario: implementing a FUSE file system on top of an ext4 file system, but all writes to ext4 are done as a single user (e.g., root). In this case, ext4's UID and GID quotas are not applicable, and users need to find other ways to implement quotas for users or groups. Given these challenges, I would like to inquire about the community's perspective on implementing quota functionality at the FUSE kernel part. Is it feasible to implement quota functionality in the FUSE kernel module, allowing users to set quotas for FUSE just as they would for ext4 (e.g., using commands like quotaon /mnt/fusefs or quotaset /mnt/fusefs)? Would the community consider accepting patches for this feature? I look forward to your insights on this matter. Thank you for your time and consideration. Best regards.
