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...! ====snip===demo program source======= #include <iostream> #include <errno.h> #include <stdio.h> #include <sys/types.h> #include <fcntl.h> #include <sys/ioctl.h> #include <unistd.h> bool os_create_reflink(const char* linkname, const char* fname) { int src_desc=open(fname, O_RDONLY); if( src_desc<0) return false; int dst_desc=open(linkname, O_WRONLY | O_CREAT | O_EXCL, S_IRWXU | S_IRWXG); if( dst_desc<0 ) { close(src_desc); return false; } #define BTRFS_IOCTL_MAGIC 0x94 #define BTRFS_IOC_CLONE _IOW (BTRFS_IOCTL_MAGIC, 9, int)...