From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viacheslav Dobromyslov Subject: btrfs: =?utf-8?b?b3Blbl9jdHJlZQ==?= failed after power loss Date: Sat, 5 Feb 2011 06:53:54 +0000 (UTC) Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: linux-btrfs@vger.kernel.org Return-path: List-ID: Hello, friends! I have some troubles with removable disk after powering off without unmounting. 'btrfsck' and 'btrfs-select-super' didn't help. # uname -srvo Linux 2.6.37-gentoo #2 SMP PREEMPT Tue Jan 11 20:58:56 VLAT 2011 GNU/Linux Installed sys-fs/btrfs-progs-0.19-r2. # btrfs fi show failed to read /dev/sr0 Label: none uuid: acf790ef-13ba-4c08-b0d3-3ab9938b5b94 Total devices 1 FS bytes used 9.97GB devid 1 size 14.65GB used 14.65GB path /dev/sda4 Label: none uuid: 53b9ab33-8049-46e0-a90f-b601446abc79 Total devices 1 FS bytes used 20.35GB devid 1 size 150.00GB used 23.29GB path /dev/sdc2 # mount -t btrfs /dev/sdc2 /mnt/ mount: wrong fs type, bad option, bad superblock on /dev/sdc2, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so # dmesg device fsid e046498033abb953-79bc6a4401b60fa9 devid 1 transid 433 /dev/sdc2 btrfs: open_ctree failed # btrfsck /dev/sdc2 found 21851738112 bytes used err is 0 total csum bytes: 21297140 total tree bytes: 43466752 total fs tree bytes: 17068032 btree space waste bytes: 7526756 file data blocks allocated: 21808271360 referenced 21808271360 Btrfs Btrfs v0.19 # btrfs-select-super -s 1 /dev/sdc2 using SB copy 1, bytenr 67108864 # btrfs-debug-tree /dev/sdc2 root tree leaf 23651717120 items 12 free space 1987 generation 433 owner 1 fs uuid 53b9ab33-8049-46e0-a90f-b601446abc79 chunk uuid 461537d2-d586-4f0c-9469-09d8933bce0a item 0 key (EXTENT_TREE ROOT_ITEM 0) itemoff 3756 itemsize 239 root data bytenr 23651721216 level 2 dirid 0 refs 1 ..................................... item 30 key (12298 EXTENT_DATA 0) itemoff 1548 itemsize 53 extent data disk byte 22261157888 nr 13418496 extent data offset 0 nr 13418496 ram 13418496 extent compression 0 data reloc tree key (DATA_RELOC_TREE ROOT_ITEM 0) leaf 29380608 items 2 free space 3773 generation 5 owner 18446744073709551607 fs uuid 53b9ab33-8049-46e0-a90f-b601446abc79 chunk uuid 461537d2-d586-4f0c-9469-09d8933bce0a item 0 key (FIRST_CHUNK_TREE INODE_ITEM 0) itemoff 3835 itemsize 160 inode generation 4 size 0 block group 0 mode 40555 links 1 item 1 key (FIRST_CHUNK_TREE INODE_REF 256) itemoff 3823 itemsize 12 inode ref index 0 namelen 2 name: .. total bytes 161067429888 bytes used 21851738112 uuid 53b9ab33-8049-46e0-a90f-b601446abc79 Btrfs Btrfs v0.19 I've already found similar trouble http://www.spinics.net/lists/linux- btrfs/msg07572.html . but that solution didn't help.