First superblock is zero-ed and its not some random corruption,
most probably someone else other than btrfs used the disk when
it was unmounted? Or if the partition (if any) was changed? or
if its a SAN storge hope the LUN wasn't recreated at the storage end.
Thanks, Anand
On 04/07/2018 08:56 AM, Qu Wenruo wrote:
On 2018年04月07日 08:35, Ben Parsons wrote:
btrfs inspect-internal dump-super -Ffa /path
superblock: bytenr=65536, device=/dev/sda
---------------------------------------------------------
csum_type 0 (crc32c)
csum_size 4
csum 0x00000000 [DON'T MATCH]
bytenr 0
flags 0x0
magic ........ [DON'T MATCH]
fsid 00000000-0000-0000-0000-000000000000
First super block is completely gone.
label
generation 0
root 0
sys_array_size 0
chunk_root_generation 0
root_level 0
chunk_root 0
chunk_root_level 0
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 0
bytes_used 0
sectorsize 0
nodesize 0
leafsize (deprecated) 0
stripesize 0
root_dir 0
num_devices 0
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x0
cache_generation 0
uuid_tree_generation 0
dev_item.uuid 00000000-0000-0000-0000-000000000000
dev_item.fsid 00000000-0000-0000-0000-000000000000 [match]
dev_item.type 0
dev_item.total_bytes 0
dev_item.bytes_used 0
dev_item.io_align 0
dev_item.io_width 0
dev_item.sector_size 0
dev_item.devid 0
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
sys_chunk_array[2048]:
backup_roots[4]:
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