Geert Uytterhoeven wrote:
Hi, `hdparm -t' uses HDIO_DRIVE_CMD(null) to flush the disk's buffer.
More correctly, that command is supposed to act like an I/O queue "barrier" operation, not returning from the syscall until everything queued in front of it has been issued/completed. I believe that only the original IDE driver actually implements it, though. And hdparm-7.4 (not released yet) will no longer complain about ENOTTY. Note that current versions of hdparm use SG_IO/ATA_16 (SAT) for nearly everything now, only falling back to the older ioctl's for drivers which reject the SAT attempt. I'd love to find a USB drive enclosure that supports SAT. Anyone know of one? And does the USB storage layer actually pass the ATA_16 packets to the device? Cheers - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
