bcachefs: Convert bch2_check_lrus() to for_each_btree_key_commit()

The new for_each_btree_key2() macro handles transaction retries,
allowing us to avoid nested transactions - which we want to avoid since
they're tricky to do completely correctly and upcoming assertions are
going to be checking for that.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

diff --git a/fs/bcachefs/lru.c b/fs/bcachefs/lru.c
index 94ecb3a..53e607d 100644 (file)
--- a/fs/bcachefs/lru.c
+++ b/fs/bcachefs/lru.c
@@ -130,25 +130,18 @@ int bch2_lru_change(struct btree_trans *trans, u64 id, u64 idx,
 }
 
 static int bch2_check_lru_key(struct btree_trans *trans,
-                             struct btree_iter *lru_iter)
+                             struct btree_iter *lru_iter,
+                             struct bkey_s_c lru_k)
 {
        struct bch_fs *c = trans->c;
        struct btree_iter iter;
-       struct bkey_s_c lru_k, k;
+       struct bkey_s_c k;
        struct bch_alloc_v4 a;
        struct printbuf buf1 = PRINTBUF;
        struct printbuf buf2 = PRINTBUF;
        struct bpos alloc_pos;
        int ret;
 
-       lru_k = bch2_btree_iter_peek(lru_iter);
-       if (!lru_k.k)
-               return 0;
-
-       ret = bkey_err(lru_k);
-       if (ret)
-               return ret;
-
        alloc_pos = POS(lru_k.k->p.inode,
                        le64_to_cpu(bkey_s_c_to_lru(lru_k).v->idx));
 
@@ -202,16 +195,10 @@ int bch2_check_lrus(struct bch_fs *c)
 
        bch2_trans_init(&trans, c, 0, 0);
 
-       for_each_btree_key(&trans, iter, BTREE_ID_lru, POS_MIN,
-                          BTREE_ITER_PREFETCH, k, ret) {
-               ret = commit_do(&trans, NULL, NULL,
-                                     BTREE_INSERT_NOFAIL|
-                                     BTREE_INSERT_LAZY_RW,
-                       bch2_check_lru_key(&trans, &iter));
-               if (ret)
-                       break;
-       }
-       bch2_trans_iter_exit(&trans, &iter);
+       ret = for_each_btree_key_commit(&trans, iter,
+                       BTREE_ID_lru, POS_MIN, BTREE_ITER_PREFETCH, k,
+                       NULL, NULL, BTREE_INSERT_NOFAIL|BTREE_INSERT_LAZY_RW,
+               bch2_check_lru_key(&trans, &iter, k));
 
        bch2_trans_exit(&trans);
        return ret;