On Mon, Jan 4, 2021 at 6:59 AM Sreyan Chakravarty <sreyan32@xxxxxxxxx> wrote: > > On Mon, Jan 4, 2021 at 1:16 AM Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > > > Try to mount normally, then: > > I am unable to mount normally : > > # mount -t btrfs /dev/mapper/dm_crypt /mnt/ > mount: /mnt: wrong fs type, bad option, bad superblock on > /dev/mapper/dm_crypt, missing codepage or helper program, or other > error. > > > > > dmesg > > This is what I get in dmesg: > > [29867.234062] BTRFS info (device dm-4): disk space caching is enabled > [29867.234067] BTRFS info (device dm-4): has skinny extents > [29867.317955] BTRFS error (device dm-4): parent transid verify failed > on 55640064 wanted 44146 found 44438 > [29867.326701] BTRFS error (device dm-4): parent transid verify failed > on 55640064 wanted 44146 found 44438 > [29867.326727] BTRFS warning (device dm-4): failed to read root (objectid=9): -5 > [29867.333668] BTRFS error (device dm-4): open_ctree failed transid errors like this indicate out of order writes due to drive firmware not honoring file system write ordering and then getting a badly timed crash/powerfail/shutdown. However... You report that the file system went read only while using it. This suggests a dropped write and the file system went read-only to limit the damage. Ideally we'd get the log, if it made it to disk, to see what lead up to this so we can determine what the problem is and get it fixed. What I can tell you is this is not user error but that's not much comfort. > > > btrfs check --readonly > > A lot of errors, could not even upload to pastebin. > > This is in my Google Drive: > https://drive.google.com/file/d/1dpW7aftB3FuD8i1J7d4nRrzZHaGF4vuN/view?usp=sharing Yeah that's bad. I think it's fixable. We need to get a metadata dump of the file system to see if fsck will fix it. btrfs-image -c9 -t4 /dev/sdXY /mnt/path/to/file That will include filenames but not any data. If you need to mask filenames, add -ss option to the above. (-s won't help here). And the path to file if you're on a live USB stick can just be something like ~/sreyan-btrfs.img and then put it up on the google drive. By the way I'm on irc.freenode.net as cmurf that's usually the easier way to get help, on #fedora channel. Also, have you ever done a balance on this file system? (That is not a suggestion that you should or shouldn't have. Just a yes or no question to try and piece together some other data points.) -- Chris Murphy _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
