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bcachefs: Ensure we always have a journal pin in interior update path

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For the new nodes an interior btree update makes reachable, updates to
those nodes may be journalled after the btree update starts but before
the transactional part - where we make those nodes reachable. Those
updates need to be kept in the journal until after the btree update
completes, hence we should always get a journal pin at the start of the
interior update.

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 2020-11-30 02:08:14 -05:00 committed by Kent Overstreet
parent d7b04163c2
commit 04e23a566f
1 changed files with 6 additions and 10 deletions
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16
fs/bcachefs/btree_update_interior.c
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@ -544,6 +544,8 @@ static void btree_update_nodes_written(struct btree_update *as)
unsigned i;
int ret;
BUG_ON(!journal_pin_active(&as->journal));
/*
* We did an update to a parent node where the pointers we added pointed
* to child nodes that weren't written yet: now, the child nodes have
@ -699,17 +701,7 @@ static void btree_update_reparent(struct btree_update *as,
child->b = NULL;
child->mode = BTREE_INTERIOR_UPDATING_AS;
/*
* When we write a new btree root, we have to drop our journal pin
* _before_ the new nodes are technically reachable; see
* btree_update_nodes_written().
*
* This goes for journal pins that are recursively blocked on us - so,
* just transfer the journal pin to the new interior update so
* btree_update_nodes_written() can drop it.
*/
bch2_journal_pin_copy(&c->journal, &as->journal, &child->journal, NULL);
bch2_journal_pin_drop(&c->journal, &child->journal);
}
static void btree_update_updated_root(struct btree_update *as, struct btree *b)
@ -956,6 +948,10 @@ bch2_btree_update_start(struct btree_trans *trans, enum btree_id id,
if (ret)
goto err;
bch2_journal_pin_add(&c->journal,
atomic64_read(&c->journal.seq),
&as->journal, NULL);
mutex_lock(&c->btree_interior_update_lock);
list_add_tail(&as->list, &c->btree_interior_update_list);
mutex_unlock(&c->btree_interior_update_lock);