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 int ret; 41 42 if (!fn) 43 return 0; 44 45 bch2_bkey_buf_init(&sk); 46 bch2_bkey_buf_reassemble(&sk, c, k); 47 48 ret = drop_locks_do(trans, (bch2_fs_lazy_rw(c), 0)) ?: 49 fn->resume(trans, sk.k) ?: trans_was_restarted(trans, restart_count); 50 51 bch2_bkey_buf_exit(&sk, c); 52 return ret; 53 } 54 55 int bch2_resume_logged_ops(struct bch_fs *c) 56 { 57 int ret = bch2_trans_run(c, 58 for_each_btree_key(trans, iter, 59 BTREE_ID_logged_ops, POS_MIN, 60 BTREE_ITER_PREFETCH, k, 61 resume_logged_op(trans, &iter, k))); 62 bch_err_fn(c, ret); 63 return ret; 64 } 65 66 static int __bch2_logged_op_start(struct btree_trans *trans, struct bkey_i *k) 67 { 68 struct btree_iter iter; 69 int ret; 70 71 ret = bch2_bkey_get_empty_slot(trans, &iter, BTREE_ID_logged_ops, POS_MAX); 72 if (ret) 73 return ret; 74 75 k->k.p = iter.pos; 76 77 ret = bch2_trans_update(trans, &iter, k, 0); 78 bch2_trans_iter_exit(trans, &iter); 79 return ret; 80 } 81 82 int bch2_logged_op_start(struct btree_trans *trans, struct bkey_i *k) 83 { 84 return commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 85 __bch2_logged_op_start(trans, k)); 86 } 87 88 void bch2_logged_op_finish(struct btree_trans *trans, struct bkey_i *k) 89 { 90 int ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc, 91 bch2_btree_delete(trans, BTREE_ID_logged_ops, k->k.p, 0)); 92 /* 93 * This needs to be a fatal error because we've left an unfinished 94 * operation in the logged ops btree. 95 * 96 * We should only ever see an error here if the filesystem has already 97 * been shut down, but make sure of that here: 98 */ 99 if (ret) { 100 struct bch_fs *c = trans->c; 101 struct printbuf buf = PRINTBUF; 102 103 bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(k)); 104 bch2_fs_fatal_error(c, "%s: error deleting logged operation %s: %s", 105 __func__, buf.buf, bch2_err_str(ret)); 106 printbuf_exit(&buf); 107 } 108 } 109