argument is a pointer to a loop_info structure, defined in <linux/loop.h> as: struct loop ... info { int lo_number; /* ioctl r/o */ dev_t lo_device; /* ioctl r/o */ unsigned longargument is a pointer to a loop_info structure, defined in <linux/loop.h> as: struct loop ... info { int lo_number; /* ioctl r/o */ dev_t lo_device; /* ioctl r/o */ unsigned long/device/path_info The path_info attribute is read-only. This attribute contains ... device is an HBA device, path_info will also display the PORTfollowing structure is used: struct rand_pool_info { int entropy_count; int buf_sizefollowing structure is used: struct rand_pool_info { int entropy_count; int buf_size