Hi,
it seems that all kernel reports struct hd_geometry.start in 512-byte
sectors:
block/ioctl.c: HDIO_GETGEO:
geo.start = get_start_sect(bdev);
ret = disk->fops->getgeo(bdev, &geo);
but only dasd driver overwrites this default and reports in native
sectors:
drivers/s390/block/dasd.c: dasd_getgeo():
geo->start = get_start_sect(bdev) >> base->block->s2b_shift;
So, for normal SCSI I always get start sector independently on disk
sector size, but for dasd...
Is it expected behavior? It's painful for userspace to care about
driver type.
(Well, HDIO_GETGEO sucks in many ways, so recommendation is to read
/sys/dev/block/<maj:min>/start rather than depends on this ioctl.)
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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