Hi
My backups broke sometime after june 26th (about the time btrfs-progs 4.1
came out). I am using btrfs-progs from git and 4.1.1 + the 4.2 for-linux
branch along with a few patches from the list.
The following is based on the wiki at:
https://btrfs.wiki.kernel.org/index.php/Incremental_Backup
Here is a log of what is happening along with a few subvolume lists
---
btrfs subvolume snapshot -r /snap/homevol
/snap/homevol/backup.2015-27-3_07-01_07:30
Create a readonly snapshot of '/snap/homevol' in
'/snap/homevol/backup.2015-27-3_07-01_07:30'
btrfs send -ve /snap/homevol/backup.2015-27-3_07-01_07:30 | btrfs receive
-v /backup/home
At subvol /snap/homevol/backup.2015-27-3_07-01_07:30
At subvol backup.2015-27-3_07-01_07:30
receiving subvol backup.2015-27-3_07-01_07:30
uuid=cff4f305-6ef3-234e-ac6d-bdfd87d926d7, stransid=392551
BTRFS_IOC_SEND returned 0
joining genl thread
BTRFS_IOC_SET_RECEIVED_SUBVOL uuid=cff4f305-6ef3-234e-ac6d-bdfd87d926d7,
stransid=392551
btrfs subvol delete -c /snap/homevol/backup
Delete subvolume (commit): '/snap/homevol/backup'
mv /snap/homevol/backup.2015-27-3_07-01_07:30 /snap/homevol/backup
btrfs subvol list -puq /snap
ID 258 gen 393101 parent 5 top level 5 parent_uuid - uuid
6447cef2-9b1a-c146-8dc3-b759ed2dd694 path homevol
ID 746 gen 392551 parent 258 top level 258 parent_uuid
6447cef2-9b1a-c146-8dc3-b759ed2dd694 uuid
cff4f305-6ef3-234e-ac6d-bdfd87d926d7 path homevol/backup
btrfs subvol list -puq /backup | grep home
ID 2941 gen 2689 parent 5 top level 5 parent_uuid - uuid
113972bf-ab10-294f-9d6e-587e1ad43726 path home/backup.2015-27-3_07-01_07:30
btrfs subvolume snapshot -r /snap/homevol
/snap/homevol/backup.2015-27-3_07-01_13:04
Create a readonly snapshot of '/snap/homevol' in
'/snap/homevol/backup.2015-27-3_07-01_13:04'
btrfs send -ve -p $base $news | btrfs receive -v /backup/home
At subvol /snap/homevol/backup.2015-27-3_07-01_13:04
At snapshot backup.2015-27-3_07-01_13:04
receiving snapshot backup.2015-27-3_07-01_13:04
uuid=38b701ed-973d-584b-92b7-ff0cdd509ecc, ctransid=393110
parent_uuid=cb3ad856-ca0f-f744-b7c3-b33f2d5bc8d3, parent_ctransid=392551
ERROR: could not find parent subvolume
---
Why is the parent not found any more?
TIA,
Ed Tomlinson
#btrfs fi usage /snap
WARNING: RAID56 detected, not implemented
WARNING: RAID56 detected, not implemented
WARNING: RAID56 detected, not implemented
Overall:
Device size: 2.71TiB
Device allocated: 20.00MiB
Device unallocated: 2.71TiB
Device missing: 0.00B
Used: 0.00B
Free (estimated): 273.33PiB (min: 3.50TiB)
Data ratio: 0.00
Metadata ratio: 0.00
Global reserve: 512.00MiB (used: 0.00B)
Data,single: Size:8.00MiB, Used:0.00B
/dev/sdd1 8.00MiB
Data,RAID5: Size:806.00GiB, Used:786.82GiB
/dev/sdd1 403.00GiB
/dev/sde1 403.00GiB
/dev/sdf1 403.00GiB
Metadata,single: Size:8.00MiB, Used:0.00B
/dev/sdd1 8.00MiB
Metadata,RAID5: Size:14.00GiB, Used:7.00GiB
/dev/sdd1 7.00GiB
/dev/sde1 7.00GiB
/dev/sdf1 7.00GiB
System,single: Size:4.00MiB, Used:0.00B
/dev/sdd1 4.00MiB
System,RAID5: Size:16.00MiB, Used:96.00KiB
/dev/sdd1 8.00MiB
/dev/sde1 8.00MiB
/dev/sdf1 8.00MiB
btrfs-progs v4.1-10-g1b1fd2c
Unallocated:
/dev/sdd1 515.97GiB
/dev/sde1 515.99GiB
/dev/sdf1 515.99GiB
#btrfs fi show /backup
Label: 'backupfs' uuid: 0df1bbd3-b19a-44eb-a9a6-d082c2f61914
Total devices 1 FS bytes used 1.78TiB
devid 1 size 3.44TiB used 1.81TiB path /dev/sda1
btrfs-progs v4.1-10-g1b1fd2c
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