On Mon, 01/16 22:11, Eric Farman wrote: > (cc'ing linux-scsi for the cover-letter; patches only to QEMU lists.) > > In the Linux kernel, I see two (three) places where the BLKSECTGET ioctl is > handled: > > (1) block/(compat_)ioctl.c -- (compat_)blkdev_ioctl > (2) drivers/scsi/sg.c -- sg_ioctl > > The former has been around forever[1], and returns a short value measured in > sectors. A sector is generally assumed to be 512 bytes. > > The latter has been around for slightly less than forever[2], and returns an > int that measures the value in bytes. A change to return the block count > was brought up a few years ago[3] and nacked. > > As a convenient example, if I use the blockdev tool to drive the ioctl to a > SCSI disk and its scsi-generic equivalent, I get different results: Fun! :-/ The patch looks correct but I don't like how it is written a lot, but still thanks for bringing it up so we won't be bitten in the future, and your detailed explanation is much appreciated! Fam -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
