Hi, (please CC me in replies, I'm not subscribed)
I'm using kernel 4.7.7-100.fc23 with btrfs-progs v4.7.1. I had my /home, /var, and /opt as subvolumes in a btrfs partition. Last night btrfs failed, and I was unable to mount it normally (leading to boot failures). The journal had messages like this: BTRFS: open_ctree failed BTRFS error: super_total_bytes ... mismatch with fs_devices total_rw_bytes BTRFS error: failed to read chunk tree: -22 Finally I managed to mount it manually like this (after making a dd image of the partition): # mount -t btrfs -o ro,recovery,nospace_cache /dev/sdb2 /mnt and managed to recover my data. Initially "btrfs check" yielded a few parent transid verify failed on 101679726592 wanted 822619 found 822617 and checksum verify failed on 101756387328 found 78C8A0BC wanted B7C59D79 however after backing up my data, I mounted without the "-o ro" (I got a transid related message, but it did mount). "btrfs check" now spits out a whole bunch of: Incorrect local backref count on 202118008832 root 259 owner 178928 offset 41181184 found 2 wanted 7 back 0x55713fbbf150 Incorrect global backref count on 202118008832 found 2 wanted 7 backpointer mismatch on [202118008832 376832] followed by this summary: checking csums checking root refs checking quota groups Counts for qgroup id: 0/257 are different our: referenced 7746465792 referenced compressed 7746465792 disk: referenced 7746461696 referenced compressed 7746461696 diff: referenced 4096 referenced compressed 4096 our: exclusive 7746465792 exclusive compressed 7746465792 disk: exclusive 7746461696 exclusive compressed 7746461696 diff: exclusive 4096 exclusive compressed 4096 Counts for qgroup id: 0/259 are different our: referenced 135641784320 referenced compressed 135641784320 disk: referenced 135633862656 referenced compressed 135633862656 diff: referenced 7921664 referenced compressed 7921664 our: exclusive 135641784320 exclusive compressed 135641784320 disk: exclusive 135633862656 exclusive compressed 135633862656 diff: exclusive 7921664 exclusive compressed 7921664 found 167864082432 bytes used err is 0 total csum bytes: 161187492 total tree bytes: 2021015552 total fs tree bytes: 1725759488 total extent tree bytes: 86228992 btree space waste bytes: 386160897 file data blocks allocated: 1269363683328 referenced 164438126592 How do I repair this? Any thoughts and guidance would be greatly appreciated. I am not well versed with all the btrfs commands and utilities, so I hope I have managed to provide all the right information. Thanks, PS: I see that it now it mounts normally as well! As in, with default fstab options, so I guess I can boot. I would still like to repair the errors. -- Suvayu Open source is the future. It sets us free. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
