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    Subject[PATCH AUTOSEL 5.10 099/116] btrfs: remove BUG_ON() in find_parent_nodes()
    Date
    From: Josef Bacik <josef@toxicpanda.com>

    [ Upstream commit fcba0120edf88328524a4878d1d6f4ad39f2ec81 ]

    We search for an extent entry with .offset = -1, which shouldn't be a
    thing, but corruption happens. Add an ASSERT() for the developers,
    return -EUCLEAN for mortals.

    Signed-off-by: Josef Bacik <josef@toxicpanda.com>
    Reviewed-by: David Sterba <dsterba@suse.com>
    Signed-off-by: David Sterba <dsterba@suse.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    fs/btrfs/backref.c | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
    index 6e447bdaf9ec8..8b471579e26e1 100644
    --- a/fs/btrfs/backref.c
    +++ b/fs/btrfs/backref.c
    @@ -1213,7 +1213,12 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
    ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0);
    if (ret < 0)
    goto out;
    - BUG_ON(ret == 0);
    + if (ret == 0) {
    + /* This shouldn't happen, indicates a bug or fs corruption. */
    + ASSERT(ret != 0);
    + ret = -EUCLEAN;
    + goto out;
    + }

    #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
    if (trans && likely(trans->type != __TRANS_DUMMY) &&
    --
    2.34.1
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