Re: [PATCH 0/5] btrfs-progs: Bad extent item generation related bug fixes

[David Sterba <dsterba@suse.cz>]

On Tue, Dec 31, 2019 at 03:12:15PM +0800, Qu Wenruo wrote:
> There is an issue reported in github, where an fs get corrupted
> extent tree initialy, then I recommended --init-extent-tree.
> 
> Although --init-extent-tree indeed fixed the original problem, it caused
> new problems, quite a lot of EXTENT_ITEMs now get bad generation number,
> which failed to mount with v5.4.
> 
> The problem turns out to be a bug in backref repair code, which doesn't
> initialize extent_record::generation, causing garbage in EXTENT_ITEMs.
> 
> This patch will:
> - Fix the problem
>   Patch 1
> 
> - Enhance EXTENT_ITEM generation repair
>   Patch 2
> 
> - Make `btrfs check` able to detect such bad generation
>   Patch 3~4
> 
> - Add new test case for above ability
>   Patch 5
> 
> Qu Wenruo (5):
>   btrfs-progs: check: Initialize extent_record::generation member
>   btrfs-progs: check: Populate extent generation correctly for data
>     extents
>   btrfs-progs: check/lowmem: Detect invalid EXTENT_ITEM and EXTENT_DATA
>     generation
>   btrfs-progs: check/original: Detect invalid extent generation
>   btrfs-progs: fsck-tests: Make sure btrfs check can detect bad extent
>     item generation

Thanks for the fixes, added to devel.