Attachment #173357 for bug #211361

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{
	struct gconfig *gc;
	struct gprovider *pp, **providers;
	intmax_t sectorsize, stripesize, offset;
	intmax_t lastend;
	intmax_t start, end;
	intmax_t maxsize, maxstart;


	pp = LIST_FIRST(&geom->lg_consumer)->lg_provider;

	/*
	 * Round the start and size of the largest available space up to
	 * the nearest multiple of the adjusted stripe size.
	 *
	 * The adjusted stripe size is the least common multiple of the
	 * actual stripe size, or the sector size if no stripe size was
	 * reported, and 4096.  The reason for this is that contemporary
	 * disks often have 4096-byte physical sectors but report 512
	 * bytes instead for compatibility with older / broken operating
	 * systems and BIOSes.  For the same reasons, virtualized storage
	 * may also report a 512-byte stripe size, or none at all.
	 */
	sectorsize = pp->lg_sectorsize;
	if ((stripesize = pp->lg_stripesize) == 0)
		stripesize = sectorsize;
	while (stripesize % 4096 != 0)
		stripesize *= 2;
	if ((offset = maxstart * sectorsize % stripesize) != 0) {
		offset = (stripesize - offset) / sectorsize;
		maxstart += offset;
		maxsize -= offset;
	}

Return to bug 211361

Lines 795-800 Link Here

(-)usr.sbin/bsdinstall/partedit/gpart_ops.c (-6 / +20 lines)
795	{	795	{
796	struct gconfig *gc;	796	struct gconfig *gc;
797	struct gprovider pp, *providers;	797	struct gprovider pp, *providers;
		798	intmax_t sectorsize, stripesize, offset;
798	intmax_t lastend;	799	intmax_t lastend;
799	intmax_t start, end;	800	intmax_t start, end;
800	intmax_t maxsize, maxstart;	801	intmax_t maxsize, maxstart;
Lines 845-856 Link Here
845		846
846	pp = LIST_FIRST(&geom->lg_consumer)->lg_provider;	847	pp = LIST_FIRST(&geom->lg_consumer)->lg_provider;
847		848
848	/* Compute beginning of new partition and maximum available space */	849	/*
849	if (pp->lg_stripesize > 0 &&	850	* Round the start and size of the largest available space up to
850	(maxstart*pp->lg_sectorsize % pp->lg_stripesize) != 0) {	851	* the nearest multiple of the adjusted stripe size.
851	intmax_t offset = (pp->lg_stripesize -	852	*
852	((maxstart*pp->lg_sectorsize) % pp->lg_stripesize)) /	853	* The adjusted stripe size is the least common multiple of the
853	pp->lg_sectorsize;	854	* actual stripe size, or the sector size if no stripe size was
		855	* reported, and 4096. The reason for this is that contemporary
		856	* disks often have 4096-byte physical sectors but report 512
		857	* bytes instead for compatibility with older / broken operating
		858	* systems and BIOSes. For the same reasons, virtualized storage
		859	* may also report a 512-byte stripe size, or none at all.
		860	*/
		861	sectorsize = pp->lg_sectorsize;
		862	if ((stripesize = pp->lg_stripesize) == 0)
		863	stripesize = sectorsize;
		864	while (stripesize % 4096 != 0)
		865	stripesize *= 2;
		866	if ((offset = maxstart * sectorsize % stripesize) != 0) {
		867	offset = (stripesize - offset) / sectorsize;
854	maxstart += offset;	868	maxstart += offset;
855	maxsize -= offset;	869	maxsize -= offset;
856	}	870	}