I have a Debian system here.
fsck runs from time to time while booting (on an ext4 file system).
I get messages like this:
inode extent tree (at level 1) could be shorter IGNORED
What do they mean?
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They mean that
e2fsck determined that an extent tree (a data structure used to point to data in the file system) could be restructured to have less depth (presumably because it tracked extents in the past which are no longer in use, so the tree could be rebalanced). That’s not much of a problem in practice, unless the extent depth is greater than the maximum; so it can be ignored, as you’re seeing. If an extent tree is too big,
e2fsck will force a rebuild and you won’t see the
I think that if you run
e2fsck interactively, it will ask you whether it should fix these trees, instead of just ignoring them.