[SOLVED] After updating yesterday...

[duno]

(11th Aug, 2016 03:48 AM)Nachteule Wrote:  @duno

can you remember which kernel version you were running?

Latest, 4.4.15+ and update was to 4.4.16+

Code:

btrfs-show-super -a /dev/sdc2
superblock: bytenr=65536, device=/dev/sdc2
---------------------------------------------------------
csum            0x323e98ec [DON'T MATCH]
bytenr            65536
flags            0x1
            ( WRITTEN )
magic            _BHRfS_M [match]
fsid            2dcbf32f-7a95-41ff-bf52-65d5b4f547a5
label            xbian
generation        82234
root            33685504
sys_array_size        97
chunk_root_generation    49679
root_level        1
chunk_root        147456
chunk_root_level    0
log_root        0
log_root_transid    0
log_root_level        0
total_bytes        31111249920
bytes_used        5725069312
sectorsize        4096
nodesize        16384
leafsize        16384
stripesize        4096
root_dir        6
num_devices        1
compat_flags        0x0
compat_ro_flags        0x0
incompat_flags        0x179
            ( MIXED_BACKREF |
              COMPRESS_LZO |
              COMPRESS_LZOv2 |
              BIG_METADATA |
              EXTENDED_IREF |
              SKINNY_METADATA |
              unknown flag: 0x10 )
csum_type        0
csum_size        4
cache_generation    82233
uuid_tree_generation    82232
dev_item.uuid        70322777-7343-4491-ae65-295472f29d6d
dev_item.fsid        2dcbf32f-7a95-41ff-bf52-65d5b4f547a5 [match]
dev_item.type        0
dev_item.total_bytes    31111249920
dev_item.bytes_used    8896118784
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

superblock: bytenr=67108864, device=/dev/sdc2
---------------------------------------------------------
csum            0x0f19fcb1 [match]
bytenr            67108864
flags            0x1
            ( WRITTEN )
magic            _BHRfS_M [match]
fsid            2dcbf32f-7a95-41ff-bf52-65d5b4f547a5
label            xbian
generation        82233
root            23609344
sys_array_size        97
chunk_root_generation    49679
root_level        1
chunk_root        147456
chunk_root_level    0
log_root        0
log_root_transid    0
log_root_level        0
total_bytes        31111249920
bytes_used        5725073408
sectorsize        4096
nodesize        16384
leafsize        16384
stripesize        4096
root_dir        6
num_devices        1
compat_flags        0x0
compat_ro_flags        0x0
incompat_flags        0x179
            ( MIXED_BACKREF |
              COMPRESS_LZO |
              COMPRESS_LZOv2 |
              BIG_METADATA |
              EXTENDED_IREF |
              SKINNY_METADATA |
              unknown flag: 0x10 )
csum_type        0
csum_size        4
cache_generation    82233
uuid_tree_generation    82232
dev_item.uuid        70322777-7343-4491-ae65-295472f29d6d
dev_item.fsid        2dcbf32f-7a95-41ff-bf52-65d5b4f547a5 [match]
dev_item.type        0
dev_item.total_bytes    31111249920
dev_item.bytes_used    8896118784
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

got a match on

Code:

csum            0x0f19fcb1 [match]
bytenr            67108864
flags            0x1

Code:

btrfs-show-super -s 67108864 /dev/sdc2
superblock: bytenr=67108864, device=/dev/sdc2
---------------------------------------------------------
csum            0x0f19fcb1 [match]
bytenr            67108864
flags            0x1
            ( WRITTEN )
magic            _BHRfS_M [match]
fsid            2dcbf32f-7a95-41ff-bf52-65d5b4f547a5
label            xbian
generation        82233
root            23609344
sys_array_size        97
chunk_root_generation    49679
root_level        1
chunk_root        147456
chunk_root_level    0
log_root        0
log_root_transid    0
log_root_level        0
total_bytes        31111249920
bytes_used        5725073408
sectorsize        4096
nodesize        16384
leafsize        16384
stripesize        4096
root_dir        6
num_devices        1
compat_flags        0x0
compat_ro_flags        0x0
incompat_flags        0x179
            ( MIXED_BACKREF |
              COMPRESS_LZO |
              COMPRESS_LZOv2 |
              BIG_METADATA |
              EXTENDED_IREF |
              SKINNY_METADATA |
              unknown flag: 0x10 )
csum_type        0
csum_size        4
cache_generation    82233
uuid_tree_generation    82232
dev_item.uuid        70322777-7343-4491-ae65-295472f29d6d
dev_item.fsid        2dcbf32f-7a95-41ff-bf52-65d5b4f547a5 [match]
dev_item.type        0
dev_item.total_bytes    31111249920
dev_item.bytes_used    8896118784
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

But how to restore that?

Code:

bytenr            67108864

is normally "s 1" but

Code:

btrfsck -s 1 /dev/sdc2

or

Code:

btrfs check -s 1 /dev/sdc2

gives an

Code:

using SB copy 1, bytenr 67108864
ERROR: superblock checksum mismatch
couldn't open because of unsupported option features (10).
Couldn't open file system

I do not understand this btrfs-stuff