Xin Zhou <xin.z...@gmx.com> 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" <lihamakaroonilaati...@gmail.com> > To: linux-btrfs@vger.kernel.org > 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 > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- *** Jari Seppälä -- 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
