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bcachefs: Fix btree node merge -> split operations

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If a btree node merger is followed by a split or compact of the parent
node, we could end up with the parent btree node iterator pointing to
the whiteout inserted by the btree node merge operation - the fix is to
ensure that interior btree node iterators always point to the first non
whiteout.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-12-11 12:02:48 -05:00 committed by Kent Overstreet
parent 5b9bf43c81
commit 537c49d6af
1 changed files with 7 additions and 0 deletions
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7
fs/bcachefs/btree_iter.c
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@ -902,6 +902,13 @@ static inline void __btree_iter_init(struct btree_iter *iter,
bch2_btree_node_iter_init(&l->iter, l->b, &pos);
/*
* Iterators to interior nodes should always be pointed at the first non
* whiteout:
*/
if (level)
bch2_btree_node_iter_peek(&l->iter, l->b);
btree_iter_set_dirty(iter, BTREE_ITER_NEED_PEEK);
}