void hd_geometry_guess(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) { int cylinders, heads, secs, translation; bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); translation = bdrv_get_translation_hint(bs); if (cylinders != 0) { /* already got a geometry hint: use it */ *pcyls = cylinders; *pheads = heads; *psecs = secs; return; } if (guess_disk_lchs(bs, &cylinders, &heads, &secs) < 0) { /* no LCHS guess: use a standard physical disk geometry */ guess_chs_for_size(bs, pcyls, pheads, psecs); } else if (heads > 16) { /* LCHS guess with heads > 16 means that a BIOS LBA translation was active, so a standard physical disk geometry is OK */ guess_chs_for_size(bs, pcyls, pheads, psecs); if (translation == BIOS_ATA_TRANSLATION_AUTO) { bdrv_set_translation_hint(bs, *pcyls * *pheads <= 131072 ? BIOS_ATA_TRANSLATION_LARGE : BIOS_ATA_TRANSLATION_LBA); } } else { /* LCHS guess with heads <= 16: use as physical geometry */ *pcyls = cylinders; *pheads = heads; *psecs = secs; /* disable any translation to be in sync with the logical geometry */ if (translation == BIOS_ATA_TRANSLATION_AUTO) { bdrv_set_translation_hint(bs, BIOS_ATA_TRANSLATION_NONE); } } bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); trace_hd_geometry_guess(bs, *pcyls, *pheads, *psecs, translation); }