220  * raid set level, layout and chunk sectors backup/restore
298 …aid4 (dedicated first parity disk)",    1, 2, 5,  ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */
429 static bool __is_raid10_far(int layout);
525 #define RAID10_FAR_COPIES_SHIFT		8	  /* raid10 # far copies shift (2nd byte of layout) */
527 /* Return md raid10 near copies for @layout */
528 static unsigned int __raid10_near_copies(int layout)  in __raid10_near_copies()  argument
530 	return layout & 0xFF;  in __raid10_near_copies()
533 /* Return md raid10 far copies for @layout */
534 static unsigned int __raid10_far_copies(int layout)  in __raid10_far_copies()  argument
536 	return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);  in __raid10_far_copies()
539 /* Return true if md raid10 offset for @layout */
540 static bool __is_raid10_offset(int layout)  in __is_raid10_offset()  argument
542 	return !!(layout & RAID10_OFFSET);  in __is_raid10_offset()
545 /* Return true if md raid10 near for @layout */
546 static bool __is_raid10_near(int layout)  in __is_raid10_near()  argument
548 	return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;  in __is_raid10_near()
551 /* Return true if md raid10 far for @layout */
552 static bool __is_raid10_far(int layout)  in __is_raid10_far()  argument
554 	return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;  in __is_raid10_far()
557 /* Return md raid10 layout string for @layout */
558 static const char *raid10_md_layout_to_format(int layout)  in raid10_md_layout_to_format()  argument
566 	if (__is_raid10_offset(layout))  in raid10_md_layout_to_format()
569 	if (__raid10_near_copies(layout) > 1)  in raid10_md_layout_to_format()
572 	if (__raid10_far_copies(layout) > 1)  in raid10_md_layout_to_format()
591 /* Return md raid10 copies for @layout */
592 static unsigned int raid10_md_layout_to_copies(int layout)  in raid10_md_layout_to_copies()  argument
594 	return max(__raid10_near_copies(layout), __raid10_far_copies(layout));  in raid10_md_layout_to_copies()
635 static bool __got_raid10(struct raid_type *rtp, const int layout)  in __got_raid10()  argument
641 			return __is_raid10_near(layout);  in __got_raid10()
643 			return __is_raid10_offset(layout);  in __got_raid10()
645 			return __is_raid10_far(layout);  in __got_raid10()
666 /* Return raid_type for @name based derived from @level and @layout */
667 static struct raid_type *get_raid_type_by_ll(const int level, const int layout)  in get_raid_type_by_ll()  argument
672 		/* RAID10 special checks based on @layout flags/properties */  in get_raid_type_by_ll()
674 		    (__got_raid10(rtp, layout) || rtp->algorithm == layout))  in get_raid_type_by_ll()
715 	mddev->new_layout = mddev->layout;  in rs_set_cur()
728 	mddev->layout = mddev->new_layout;  in rs_set_new()
762 	rs->md.layout = raid_type->algorithm;  in raid_set_alloc()
763 	rs->md.new_layout = rs->md.layout;  in raid_set_alloc()
1119  *    [raid10_format <near|far|offset>] Layout algorithm.  (Default: near)
1509 			rs->ti->error = "Failed to recognize new raid10 layout";  in parse_raid_params()
1749 		if (__is_raid10_offset(mddev->layout))  in rs_check_takeover()
1752 		near_copies = __raid10_near_copies(mddev->layout);  in rs_check_takeover()
1766 			    __raid10_far_copies(mddev->layout) > 1)  in rs_check_takeover()
1774 		    max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)  in rs_check_takeover()
1813 		    mddev->layout == ALGORITHM_PARITY_N)  in rs_check_takeover()
1820 		    mddev->layout == ALGORITHM_PARITY_N)  in rs_check_takeover()
1825 		    mddev->layout == ALGORITHM_PARITY_N)  in rs_check_takeover()
1835 		    ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||  in rs_check_takeover()
1843 		    mddev->layout == ALGORITHM_PARITY_N)  in rs_check_takeover()
1848 		    mddev->layout == ALGORITHM_PARITY_N)  in rs_check_takeover()
1853 		    ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||  in rs_check_takeover()
1872 /* True if layout is set to reshape. */
1876 	       rs->md.new_layout != rs->md.layout ||  in rs_is_layout_change()
1950 	__le32 layout;  member
1981 	 * them from old to new layout
2118 	sb->layout = cpu_to_le32(mddev->layout);  in super_sync()
2230 	mddev->layout = le32_to_cpu(sb->layout);  in super_init_validation()
2238 		/* Superblock is authoritative wrt given raid set layout! */  in super_init_validation()
2259 			rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);  in super_init_validation()
2266 		struct raid_type *rt_cur = get_raid_type_by_ll(mddev->level, mddev->layout);  in super_init_validation()
2277 			DMERR("Reshaping raid sets not yet supported by metadata. (raid layout change keeping level)");  in super_init_validation()
2278 			if (mddev->layout != mddev->new_layout) {  in super_init_validation()
2280 					DMERR("	 current layout %s vs new layout %s",  in super_init_validation()
2283 					DMERR("	 current layout 0x%X vs new layout 0x%X",  in super_init_validation()
2284 					      le32_to_cpu(sb->layout), mddev->new_layout);  in super_init_validation()
2293 				DMERR("	 Old layout: %s w/ %u copies",  in super_init_validation()
2294 				      raid10_md_layout_to_format(mddev->layout),  in super_init_validation()
2295 				      raid10_md_layout_to_copies(mddev->layout));  in super_init_validation()
2296 				DMERR("	 New layout: %s w/ %u copies",  in super_init_validation()
2398 				if (rs_is_raid10(rs) && __is_raid10_near(mddev->layout)) {  in super_init_validation()
2399 					if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||  in super_init_validation()
2643 		 * Changing RAID layout or chunk size -> toggle offsets  in rs_adjust_data_offsets()
2718 			/* raid0 -> raid10_far layout */  in rs_setup_takeover()
2719 			mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,  in rs_setup_takeover()
2722 			/* raid1 -> raid10_near layout */  in rs_setup_takeover()
2723 			mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,  in rs_setup_takeover()
2758 		    __is_raid10_near(mddev->layout) &&  in rs_prepare_reshape()
2760 		    rs->raid10_copies != __raid10_near_copies(mddev->layout)) {  in rs_prepare_reshape()
2774 			mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,  in rs_prepare_reshape()
2776 			mddev->new_layout = mddev->layout;  in rs_prepare_reshape()
2828  * - change raid layout
2844 	/* Ignore impossible layout change whilst adding/removing disks */  in rs_setup_reshape()
2846 	    mddev->layout != mddev->new_layout) {  in rs_setup_reshape()
2847 		DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks);  in rs_setup_reshape()
2848 		mddev->new_layout = mddev->layout;  in rs_setup_reshape()
2898 	/* Change layout and/or chunk size */  in rs_setup_reshape()
2901 		 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:  in rs_setup_reshape()
2903 		 * keeping number of disks and do layout change ->  in rs_setup_reshape()
2914 		 * case of layout/chunksize change  (for disk  in rs_setup_reshape()
2938  * at the end of a reshape but not (yet) reset the layout configuration
3073 	 * Backup any new raid set level, layout, ...  in raid_ctr()
3104 	/* Restore any requested new layout for conversion decision */  in raid_ctr()
3289 		/* Restore new, ctr requested layout to perform check */  in raid_ctr()
3558 		 *  changing the raid layout or the number of  in raid_status()
3654 					 raid10_md_layout_to_copies(mddev->layout));  in raid_status()
3657 					 raid10_md_layout_to_format(mddev->layout));  in raid_status()