This is a nice overview https://btrfs.wiki.kernel.org/index.php/Data_Structures but does not show how things work. Would be helpful if there was a presentation that shows what happens when for example you copy a file to understand the use of each tree better? I don''t understand what went wrong in which tree? parent transid verify failed (transid in root tree?) leaf parent key incorrect (fs tree?) bad block (csum tree does not match block?) And finally can this be fixt? root@v7:/srv# btrfsck disk parent transid verify failed on 30113792 wanted 13 found 35 parent transid verify failed on 30113792 wanted 13 found 35 parent transid verify failed on 30113792 wanted 13 found 35 parent transid verify failed on 30113792 wanted 13 found 35 Ignoring transid failure checking extents parent transid verify failed on 61681664 wanted 9 found 33 parent transid verify failed on 61681664 wanted 9 found 33 parent transid verify failed on 61681664 wanted 9 found 33 parent transid verify failed on 61681664 wanted 9 found 33 Ignoring transid failure leaf parent key incorrect 61681664 parent transid verify failed on 61681664 wanted 9 found 33 Ignoring transid failure leaf parent key incorrect 61681664 parent transid verify failed on 61681664 wanted 9 found 33 Ignoring transid failure leaf parent key incorrect 61681664 leaf parent key incorrect 29593600 bad block 29593600 parent transid verify failed on 29933568 wanted 13 found 34 parent transid verify failed on 29933568 wanted 13 found 34 parent transid verify failed on 29933568 wanted 13 found 34 parent transid verify failed on 29933568 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29933568 parent transid verify failed on 62836736 wanted 9 found 33 parent transid verify failed on 62836736 wanted 9 found 33 parent transid verify failed on 62836736 wanted 9 found 33 parent transid verify failed on 62836736 wanted 9 found 33 Ignoring transid failure parent transid verify failed on 29962240 wanted 13 found 34 parent transid verify failed on 29962240 wanted 13 found 34 parent transid verify failed on 29962240 wanted 13 found 34 parent transid verify failed on 29962240 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29962240 parent transid verify failed on 29962240 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29962240 parent transid verify failed on 29962240 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29962240 parent transid verify failed on 29962240 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29962240 parent transid verify failed on 29962240 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29962240 parent transid verify failed on 29962240 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29962240 leaf parent key incorrect 29483008 bad block 29483008 leaf parent key incorrect 29548544 bad block 29548544 leaf parent key incorrect 29560832 bad block 29560832 bad block 29573120 leaf parent key incorrect 29581312 bad block 29581312 leaf parent key incorrect 29630464 bad block 29630464 leaf parent key incorrect 29691904 bad block 29691904 parent transid verify failed on 29933568 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29777920 bad block 29777920 leaf parent key incorrect 29904896 bad block 29904896 leaf parent key incorrect 29917184 bad block 29917184 leaf parent key incorrect 29933568 bad block 29933568 parent transid verify failed on 29933568 wanted 13 found 34 Ignoring transid failure leaf parent key incorrect 29962240 bad block 29962240 leaf parent key incorrect 29970432 bad block 29970432 leaf parent key incorrect 29974528 bad block 29974528 leaf parent key incorrect 30068736 bad block 30068736 btrfsck: btrfsck.c:1935: check_owner_ref: Assertion `!(rec->is_root)'' failed. Aborted (core dumped) root@v7:/srv# -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html