Xin Zhou <[email protected]> kirjoitti 19.12.2016 kello 20.44:
>
> Hi Jari,
>
> The message shows:
>> [ 135.446260] BTRFS error (device sdb1): superblock contains fatal errors
>
> So according this info, before trying to run repair / rescue procedure, would
> you like to show the 0,1,2 superblock status?
>
btrfs-show-super /dev/sdb1 -i 0 to 2
superblock: bytenr=65536, device=/dev/sdb1
---------------------------------------------------------
csum 0x73d698e5 [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 82651f91-4989-415b-bd83-ae830f12608c
label share
generation 75016
root 29851648
sys_array_size 0
chunk_root_generation 75016
root_level 1
chunk_root 20971520
chunk_root_level 0
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 536869842944
bytes_used 294473035776
sectorsize 4096
nodesize 16384
leafsize 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x161
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA )
csum_type 0
csum_size 4
cache_generation 75012
uuid_tree_generation 75012
dev_item.uuid 108c02c0-9812-428e-8f90-23bdf88e11bf
dev_item.fsid 82651f91-4989-415b-bd83-ae830f12608c [match]
dev_item.type 0
dev_item.total_bytes 536869842944
dev_item.bytes_used 440259313664
dev_item.io_align 0
dev_item.io_width 0
dev_item.sector_size 0
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/sdb1
---------------------------------------------------------
csum 0xd3b7b02b [match]
bytenr 67108864
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 82651f91-4989-415b-bd83-ae830f12608c
label share
generation 75016
root 29851648
sys_array_size 0
chunk_root_generation 75016
root_level 1
chunk_root 20971520
chunk_root_level 0
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 536869842944
bytes_used 294473035776
sectorsize 4096
nodesize 16384
leafsize 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x161
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA )
csum_type 0
csum_size 4
cache_generation 75012
uuid_tree_generation 75012
dev_item.uuid 108c02c0-9812-428e-8f90-23bdf88e11bf
dev_item.fsid 82651f91-4989-415b-bd83-ae830f12608c [match]
dev_item.type 0
dev_item.total_bytes 536869842944
dev_item.bytes_used 440259313664
dev_item.io_align 0
dev_item.io_width 0
dev_item.sector_size 0
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
superblock: bytenr=274877906944, device=/dev/sdb1
---------------------------------------------------------
csum 0x2e30e61a [match]
bytenr 274877906944
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
fsid 82651f91-4989-415b-bd83-ae830f12608c
label share
generation 75016
root 29851648
sys_array_size 0
chunk_root_generation 75016
root_level 1
chunk_root 20971520
chunk_root_level 0
log_root 0
log_root_transid 0
log_root_level 0
total_bytes 536869842944
bytes_used 294473035776
sectorsize 4096
nodesize 16384
leafsize 16384
stripesize 4096
root_dir 6
num_devices 1
compat_flags 0x0
compat_ro_flags 0x0
incompat_flags 0x161
( MIXED_BACKREF |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA )
csum_type 0
csum_size 4
cache_generation 75012
uuid_tree_generation 75012
dev_item.uuid 108c02c0-9812-428e-8f90-23bdf88e11bf
dev_item.fsid 82651f91-4989-415b-bd83-ae830f12608c [match]
dev_item.type 0
dev_item.total_bytes 536869842944
dev_item.bytes_used 440259313664
dev_item.io_align 0
dev_item.io_width 0
dev_item.sector_size 0
dev_item.devid 1
dev_item.dev_group 0
dev_item.seek_speed 0
dev_item.bandwidth 0
dev_item.generation 0
Regards,
Jari
> Regards,
> Xin
>
>
>
> Sent: Monday, December 19, 2016 at 2:32 AM
> From: "Jari Seppälä" <[email protected]>
> To: [email protected]
> Cc: "Xin Zhou" <[email protected]>
> Subject: Re: Help please: BTRFS fs crashed due to bad removal of USB drive,
> no help from recovery procedures
> Xin Zhou <[email protected]> kirjoitti 17.12.2016 kello 22.27:
>>
>> Hi Jari,
>>
>> Similar with other file system, btrfs has copies of super blocks.
>> Try to run "man btrfs check", "man btrfs rescue" and related commands for
>> more details.
>> Regards,
>> Xin
>
> Hi Xin,
>
> I did follow all recovery procedures from man and wiki pages. Tools do not
> help as they thing there is no BTRFS fs anymore. However if I try to reformat
> the device I get:
>
> btrfs-progs v4.4
> See http://btrfs.wiki.kernel.org for more information.
> /dev/sdb1 appears to contain an existing filesystem (btrfs).
>
> So, recovery tools seem to thing there is no btrfs filesystem. Mkfs seems to
> thing there is.
>
> What I have tried:
> btrfsck /dev/sdb1
> mount -t btrfs -o ro /dev/sdb1 /mnt/share/
> mount -t btrfs -o ro,recovery /dev/sdb1 /mnt/share/
> mount -t btrfs -o roootflags=recovery,nospace_cache /dev/sdb1 /mnt/share/
> mount -t btrfs -o rootflags=recovery,nospace_cache /dev/sdb1 /mnt/share/
> mount -t btrfs -o rootflags=recovery,nospace_cache,clear_cache /dev/sdb1
> /mnt/share/
> mount -t btrfs -o ro,rootflags=recovery,nospace_cache,clear_cache /dev/sdb1
> /mnt/share/
> btrfs restore /dev/sdb1 /target/device
> btrfs rescue zero-log /dev/sdb1
> btrfsck --init-csum-tree /dev/sdb1
> btrfsck --fix-crc /dev/sdb1
> btrfsck --check-data-csum /dev/sdb1
> btrfs rescue chunk-recover /dev/sdb1
> btrfs rescue super-recover /dev/sdb1
> btrfs rescue zero-log /dev/sdb1
>
> No help whatsoever.
>
> Jari
>
>>
>>
>>
>> Sent: Saturday, December 17, 2016 at 2:06 AM
>> From: "Jari Seppälä" <[email protected]>
>> To: [email protected]
>> Subject: Help please: BTRFS fs crashed due to bad removal of USB drive, no
>> help from recovery procedures
>> Syslog tells:
>> [ 135.446222] BTRFS error (device sdb1): system chunk array too small 0 < 97
>> [ 135.446260] BTRFS error (device sdb1): superblock contains fatal errors
>> [ 135.462544] BTRFS error (device sdb1): open_ctree failed
>>
>> What have been done:
>> * All "btrfs rescue" options
>>
>> Info on system
>> * fs on external SSD via USB
>> * kernel 4.9.0 (tried with 4.8.13)
>> * btrfs-tools 4.4
>> * Mythbuntu (Ubuntu) 16.04.1 LTS with latest fixes 2012-12-16
>>
>> Any help appreciated. Around 300G of TV recordings on the drive, which of
>> course will eventually come as replays.
>>
>> Jari
>> --
>> *** Jari Seppälä
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
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>
--
*** Jari Seppälä
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