Hi,
I have a question about the HDIO_DRIVE_TASKFILE ioctl. My goal is to
be able to send any command defined in the ATAPI-7 spec to a hard
drive. I am starting by trying to get the IDENTIFY DEVICE command to
work and will move on to more advanced commands like READ DMA, READ
SECTORS, WRITE DMA and WRITE SECTORS.
Can anyone suggest good resources for this endeavor? I've been
getting most of my information from Documentation/ioctls/hdio.txt
and the hdparm and smartmontools source code.
When I run my program the ioctl returns a -1 (indicating an error)
and errno = EFAULT (14).
dmesg looks like:
Feb 24 16:54:29 kidd kernel: (in generic_ide_ioctl) IOCTL = 0x5325
Feb 24 16:54:30 kidd kernel: (in generic_ide_ioctl) IOCTL = 0x301
Feb 24 16:54:30 kidd kernel: (in generic_ide_ioctl) IOCTL = 0x30D
Feb 24 16:54:30 kidd kernel: (in generic_ide_ioctl) IOCTL = 0x31D
Feb 24 16:54:30 kidd kernel: hda: in/out command without data
Feb 24 16:54:31 kidd kernel: (in generic_ide_ioctl) IOCTL = 0x5326
I am running the 2.6.11-1.0 kernel. Here's my code:
struct {
ide_task_request_t req_task;
int outbuf[0];
int inbuf[512];
} task;
memset(&task, 0, sizeof(task));
task_struct_t *taskfile = (task_struct_t *) task.req_task.io_ports;
int code = 0;
taskfile->data = 0;
taskfile->feature = 0;
taskfile->sector_count = 0;
taskfile->sector_number = 0;
taskfile->low_cylinder = 0;
taskfile->high_cylinder = 0;
taskfile->device_head = 0x10;
taskfile->command = 0xEC;
task.req_task.data_phase = TASKFILE_OUT; /* data phase (see
hdio.txt for details)*/
task.req_task.req_cmd = IDE_DRIVE_TASK_IN; /* command type */
task.req_task.out_size = sizeof(task.outbuf);
task.req_task.in_size = sizeof(task.inbuf);
code = ioctl(dd->fd, HDIO_DRIVE_TASKFILE, &task);
if (code){
printf("ioctl(HDIO_DRIVE_TASKFILE) status\t= %d\nerrno\t= %d\n",
code, errno);
return 1;
}
Ideas? Should I be using TASKFILE_IN and IDE_DRIVE_TASK_IN for the
data_phase and req_cmd fields since IDENTIFY DEVICE does not write to
the drive, but instead receives data from it? When I tried this I
lost access to the drive and dmesg kept giving me: "kernel: hda: lost
interrupt."
thanks,
Benjamin Livelsberger
Computer Scientist
Information Technology Laboratory,
National Institute of Standards and Technology
301.975.4411
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