1 // SPDX-License-Identifier: GPL-2.0
2
3 #include "bcachefs.h"
4 #include "bkey_buf.h"
5 #include "btree_update.h"
6 #include "error.h"
7 #include "io_misc.h"
8 #include "logged_ops.h"
9 #include "super.h"
10
11 struct bch_logged_op_fn {
12 u8 type;
13 int (*resume)(struct btree_trans *, struct bkey_i *);
14 };
15
16 static const struct bch_logged_op_fn logged_op_fns[] = {
17 #define x(n) { \
18 .type = KEY_TYPE_logged_op_##n, \
19 .resume = bch2_resume_logged_op_##n, \
20 },
21 BCH_LOGGED_OPS()
22 #undef x
23 };
24
25 static const struct bch_logged_op_fn *logged_op_fn(enum bch_bkey_type type)
26 {
27 for (unsigned i = 0; i < ARRAY_SIZE(logged_op_fns); i++)
28 if (logged_op_fns[i].type == type)
29 return logged_op_fns + i;
30 return NULL;
31 }
32
33 static int resume_logged_op(struct btree_trans *trans, struct btree_iter *iter,
34 struct bkey_s_c k)
35 {
36 struct bch_fs *c = trans->c;
37 const struct bch_logged_op_fn *fn = logged_op_fn(k.k->type);
38 struct bkey_buf sk;
39 u32 restart_count = trans->restart_count;
40
41 if (!fn)
42 return 0;
43
44 bch2_bkey_buf_init(&sk);
45 bch2_bkey_buf_reassemble(&sk, c, k);
46
47 fn->resume(trans, sk.k);
48
49 bch2_bkey_buf_exit(&sk, c);
50
51 return trans_was_restarted(trans, restart_count);
52 }
53
54 int bch2_resume_logged_ops(struct bch_fs *c)
55 {
56 int ret = bch2_trans_run(c,
57 for_each_btree_key(trans, iter,
58 BTREE_ID_logged_ops, POS_MIN,
59 BTREE_ITER_prefetch, k,
60 resume_logged_op(trans, &iter, k)));
61 bch_err_fn(c, ret);
62 return ret;
63 }
64
65 static int __bch2_logged_op_start(struct btree_trans *trans, struct bkey_i *k)
66 {
67 struct btree_iter iter;
68 int ret;
69
70 ret = bch2_bkey_get_empty_slot(trans, &iter, BTREE_ID_logged_ops, POS_MAX);
71 if (ret)
72 return ret;
73
74 k->k.p = iter.pos;
75
76 ret = bch2_trans_update(trans, &iter, k, 0);
77 bch2_trans_iter_exit(trans, &iter);
78 return ret;
79 }
80
81 int bch2_logged_op_start(struct btree_trans *trans, struct bkey_i *k)
82 {
83 return commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
84 __bch2_logged_op_start(trans, k));
85 }
86
87 void bch2_logged_op_finish(struct btree_trans *trans, struct bkey_i *k)
88 {
89 int ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
90 bch2_btree_delete(trans, BTREE_ID_logged_ops, k->k.p, 0));
91 /*
92 * This needs to be a fatal error because we've left an unfinished
93 * operation in the logged ops btree.
94 *
95 * We should only ever see an error here if the filesystem has already
96 * been shut down, but make sure of that here:
97 */
98 if (ret) {
99 struct bch_fs *c = trans->c;
100 struct printbuf buf = PRINTBUF;
101
102 bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(k));
103 bch2_fs_fatal_error(c, "deleting logged operation %s: %s",
104 buf.buf, bch2_err_str(ret));
105 printbuf_exit(&buf);
106 }
107 }
108
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