Hi, I got some questions from people asking if ceph-fuse would build with libfuse3.... Which it doesn't as it generates compile time errors errors. So checked the code and found 1 location where is said: #if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9) static void fuse_ll_fallocate(fuse_req_t req, fuse_ino_t ino, int mode, off_t offset, off_t length, struct fuse_file_info *fi) { CephFuse::Handle *cfuse = fuse_ll_req_prepare(req); Fh *fh = (Fh*)fi->fh; int r = cfuse->client->ll_fallocate(fh, mode, offset, length); fuse_reply_err(req, -r); } #endif But that looks more like a test to see if we are running the last versions of libfuse2... So there is no libfuse3 code in ceph-fuse?