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bcachefs: Lock ordering fix

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Can't take btree node locks while holding btree_reserve_cache_lock - it
would be nice if we could check this with lockdep.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet
2022-04-18 21:50:19 -04:00
committed by Kent Overstreet
parent c0960603e2
commit fd4cecd258
1 changed files with 5 additions and 6 deletions
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11
fs/bcachefs/btree_update_interior.c
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@@ -383,16 +383,13 @@ static void bch2_btree_reserve_put(struct btree_update *as)
struct bch_fs *c = as->c;
struct prealloc_nodes *p;
mutex_lock(&c->btree_reserve_cache_lock);
for (p = as->prealloc_nodes;
p < as->prealloc_nodes + ARRAY_SIZE(as->prealloc_nodes);
p++) {
while (p->nr) {
struct btree *b = p->b[--p->nr];
six_lock_intent(&b->c.lock, NULL, NULL);
six_lock_write(&b->c.lock, NULL, NULL);
mutex_lock(&c->btree_reserve_cache_lock);
if (c->btree_reserve_cache_nr <
ARRAY_SIZE(c->btree_reserve_cache)) {
@@ -406,13 +403,15 @@ static void bch2_btree_reserve_put(struct btree_update *as)
bch2_open_buckets_put(c, &b->ob);
}
mutex_unlock(&c->btree_reserve_cache_lock);
six_lock_intent(&b->c.lock, NULL, NULL);
six_lock_write(&b->c.lock, NULL, NULL);
__btree_node_free(c, b);
six_unlock_write(&b->c.lock);
six_unlock_intent(&b->c.lock);
}
}
mutex_unlock(&c->btree_reserve_cache_lock);
}
static int bch2_btree_reserve_get(struct btree_trans *trans,