66  * Per-Zone storage limit: 60 bits		1 MTB
82 #define HAMMER_OFF_ZONE_MASK	0xF000000000000000ULL /* zone portion */
137  * encode a vol_no.  Zone bits are not a part of filesystem capacity as
138  * the zone bits aren't directly or indirectly mapped to physical volumes.
144  * zone 0:		available, a big-block that contains the offset is unused
145  * zone 1 (z,v,o):	raw volume relative (offset 0 is the volume header)
146  * zone 2 (z,v,o):	raw buffer relative (offset 0 is the first buffer)
147  * zone 3 (z,o):	undo/redo fifo	- fixed zone-2 offset array in volume header
148  * zone 4 (z,v,o):	freemap		- only real blockmap
149  * zone 8 (z,v,o):	B-Tree		- actually zone-2 address
150  * zone 9 (z,v,o):	meta		- actually zone-2 address
151  * zone 10 (z,v,o):	large-data	- actually zone-2 address
152  * zone 11 (z,v,o):	small-data	- actually zone-2 address
153  * zone 15:		unavailable, usually the offset is beyond volume size
177  *	+-------------------------> vol_buf_beg (physical offset of zone-2)
178  *	| zone-4 big-block for layer1
180  *	| zone-4 big-blocks for layer2
183  *	| zone-3 big-blocks for UNDO/REDO FIFO
186  *	| zone-8 big-block for root B-Tree node/etc
188  *	| zone-9 big-block for root inode/PFS/etc
190  *	| zone-X big-blocks
207  *	+-------------------------> vol_buf_beg (physical offset of zone-2)
208  *	| zone-4 big-blocks for layer2
211  *	| zone-X big-blocks
272 #define hammer_is_index_record(zone)			\  argument
273 	((zone) >= HAMMER_ZONE_BTREE_INDEX &&		\
274 	 (zone) < HAMMER_MAX_ZONES)
279 #define hammer_is_index_direct_xlated(zone)		\  argument
280 	(((zone) == HAMMER_ZONE_RAW_BUFFER_INDEX) ||	\
281 	 ((zone) == HAMMER_ZONE_FREEMAP_INDEX) ||	\
282 	 hammer_is_index_record(zone))
287 #define HAMMER_ZONE_ENCODE(zone, ham_off)		\  argument
288 	(((hammer_off_t)(zone) << 60) | (ham_off))
302 #define HAMMER_ENCODE(zone, vol_no, offset)		\  argument
303 	(((hammer_off_t)(zone) << 60) |			\
316  * Translate a zone address to zone-X address.
318 #define hammer_xlate_to_zoneX(zone, offset)		\  argument
319 	HAMMER_ZONE_ENCODE((zone), (offset) & ~HAMMER_OFF_ZONE_MASK)
335  * A blockmap is a two-level map which translates a blockmap-backed zone
336  * offset into a raw zone 2 offset.  The layer 1 handles 18 bits and the
379  * zone:1	raw volume (no blockmap)
380  * zone:2	raw buffer (no blockmap)
381  * zone:3	undomap    (direct layer2 array in volume header)
382  * zone:4	freemap    (the only real blockmap)
383  * zone:8-15	zone id used to classify big-block only, address is actually
384  *		a zone-2 address.
387 	hammer_off_t	phys_offset;  /* zone-2 offset only used by zone-4 */
388 	hammer_off_t	first_offset; /* zone-X offset only used by zone-3 */
389 	hammer_off_t	next_offset;  /* zone-X offset for allocation */
390 	hammer_off_t	alloc_offset; /* zone-X offset only used by zone-3 */
402  * 18+19+23 = 60 bits.  The top four bits are the zone id.
405  * All primary data/meta-data zones actually encode a zone-2 address
410  * to a zone:2 (or zone:8-15) address.
412  * zone-X blockmap offset: [zone:4][layer1:18][layer2:19][big-block:23]
418  * which equals bits assigned for layer1 in zone-2 address.
422 	hammer_off_t	phys_offset;	/* UNAVAIL or zone-2 */
435  * which equals bits assigned for layer2 in zone-2 address.
443 	uint8_t		zone;		/* typed allocation zone */  member
475  * a zone-2 physical offset.
487  * a zone-2 physical offset.  Multiply the index by sizeof(blockmap_layer).
508  * header with an array of zone-2 offsets.  A maximum of (128x8MB) = 1GB,
615 	hammer_off_t		undo_offset;	/* zone-1,2 offset */
715  *	The buffer offset is a physical offset of zone-2 offset. The lower
716  *	52 bits of the zone-2 offset is added to the buffer offset of each
743 	 * These are relative to block device offset, not zone offsets.
777 	hammer_off_t vol0_btree_root;	/* B-Tree root offset in zone-8 */
788 	 * Array of zone-2 addresses for undo FIFO.
817  * Translate a zone-2 address to physical address
823  * Translate a zone-3 address to zone-2 address