superblock: bytenr=65536, device=/dev/mapper/3tb_spinner
---------------------------------------------------------
csum_type		0 (crc32c)
csum_size		4
csum			0x404bfde3 [match]
bytenr			65536
flags			0x1
			( WRITTEN )
magic			_BHRfS_M [match]
fsid			8cf4bcd8-76c7-4494-a2c8-2578136c0aa6
metadata_uuid		00000000-0000-0000-0000-000000000000
label			
generation		123887
root			875036672
sys_array_size		129
chunk_root_generation	123187
root_level		0
chunk_root		28459008
chunk_root_level	1
log_root		920076288
log_root_transid (deprecated)	0
log_root_level		0
total_bytes		3000589352960
bytes_used		1951818739712
sectorsize		4096
nodesize		16384
leafsize (deprecated)	16384
stripesize		4096
root_dir		6
num_devices		1
compat_flags		0x0
compat_ro_flags		0x3
			( FREE_SPACE_TREE |
			  FREE_SPACE_TREE_VALID )
incompat_flags		0x171
			( MIXED_BACKREF |
			  COMPRESS_ZSTD |
			  BIG_METADATA |
			  EXTENDED_IREF |
			  SKINNY_METADATA )
cache_generation	0
uuid_tree_generation	123887
dev_item.uuid		ba0038ab-68b2-4646-8f30-7d40dbd1b4ab
dev_item.fsid		8cf4bcd8-76c7-4494-a2c8-2578136c0aa6 [match]
dev_item.type		0
dev_item.total_bytes	3000589352960
dev_item.bytes_used	1981078831104
dev_item.io_align	4096
dev_item.io_width	4096
dev_item.sector_size	4096
dev_item.devid		1
dev_item.dev_group	0
dev_item.seek_speed	0
dev_item.bandwidth	0
dev_item.generation	0
sys_chunk_array[2048]:
	item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096)
		length 8388608 owner 2 stripe_len 65536 type SYSTEM|DUP
		io_align 65536 io_width 65536 sector_size 4096
		num_stripes 2 sub_stripes 1
			stripe 0 devid 1 offset 22020096
			dev_uuid ba0038ab-68b2-4646-8f30-7d40dbd1b4ab
			stripe 1 devid 1 offset 30408704
			dev_uuid ba0038ab-68b2-4646-8f30-7d40dbd1b4ab
backup_roots[4]:
	backup 0:
		backup_tree_root:	287932416	gen: 123885	level: 0
		backup_chunk_root:	28459008	gen: 123187	level: 1
		backup_extent_root:	203538432	gen: 123885	level: 2
		backup_fs_root:		185040896	gen: 123885	level: 3
		backup_dev_root:	146063360	gen: 123884	level: 1
		csum_root:	185630720	gen: 123885	level: 2
		backup_total_bytes:	3000589352960
		backup_bytes_used:	1951818743808
		backup_num_devices:	1

	backup 1:
		backup_tree_root:	805404672	gen: 123886	level: 0
		backup_chunk_root:	28459008	gen: 123187	level: 1
		backup_extent_root:	458981376	gen: 123886	level: 2
		backup_fs_root:		291143680	gen: 123886	level: 3
		backup_dev_root:	146063360	gen: 123884	level: 1
		csum_root:	185630720	gen: 123885	level: 2
		backup_total_bytes:	3000589352960
		backup_bytes_used:	1951818743808
		backup_num_devices:	1

	backup 2:
		backup_tree_root:	875036672	gen: 123887	level: 0
		backup_chunk_root:	28459008	gen: 123187	level: 1
		backup_extent_root:	806912000	gen: 123887	level: 2
		backup_fs_root:		805961728	gen: 123887	level: 3
		backup_dev_root:	146063360	gen: 123884	level: 1
		csum_root:	806600704	gen: 123887	level: 2
		backup_total_bytes:	3000589352960
		backup_bytes_used:	1951818739712
		backup_num_devices:	1

	backup 3:
		backup_tree_root:	146046976	gen: 123884	level: 0
		backup_chunk_root:	28459008	gen: 123187	level: 1
		backup_extent_root:	44793856	gen: 123884	level: 2
		backup_fs_root:		185040896	gen: 123885	level: 3
		backup_dev_root:	146063360	gen: 123884	level: 1
		csum_root:	36765696	gen: 123884	level: 2
		backup_total_bytes:	3000589352960
		backup_bytes_used:	1951779827712
		backup_num_devices:	1