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-rw-r--r--fs/bcachefs/logged_ops.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/fs/bcachefs/logged_ops.c b/fs/bcachefs/logged_ops.c
new file mode 100644
index 0000000000..8640f7dee0
--- /dev/null
+++ b/fs/bcachefs/logged_ops.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "bcachefs.h"
+#include "bkey_buf.h"
+#include "btree_update.h"
+#include "error.h"
+#include "io_misc.h"
+#include "logged_ops.h"
+#include "super.h"
+
+struct bch_logged_op_fn {
+ u8 type;
+ int (*resume)(struct btree_trans *, struct bkey_i *);
+};
+
+static const struct bch_logged_op_fn logged_op_fns[] = {
+#define x(n) { \
+ .type = KEY_TYPE_logged_op_##n, \
+ .resume = bch2_resume_logged_op_##n, \
+},
+ BCH_LOGGED_OPS()
+#undef x
+};
+
+static const struct bch_logged_op_fn *logged_op_fn(enum bch_bkey_type type)
+{
+ for (unsigned i = 0; i < ARRAY_SIZE(logged_op_fns); i++)
+ if (logged_op_fns[i].type == type)
+ return logged_op_fns + i;
+ return NULL;
+}
+
+static int resume_logged_op(struct btree_trans *trans, struct btree_iter *iter,
+ struct bkey_s_c k)
+{
+ struct bch_fs *c = trans->c;
+ const struct bch_logged_op_fn *fn = logged_op_fn(k.k->type);
+ struct bkey_buf sk;
+ u32 restart_count = trans->restart_count;
+ int ret;
+
+ if (!fn)
+ return 0;
+
+ bch2_bkey_buf_init(&sk);
+ bch2_bkey_buf_reassemble(&sk, c, k);
+
+ ret = drop_locks_do(trans, (bch2_fs_lazy_rw(c), 0)) ?:
+ fn->resume(trans, sk.k) ?: trans_was_restarted(trans, restart_count);
+
+ bch2_bkey_buf_exit(&sk, c);
+ return ret;
+}
+
+int bch2_resume_logged_ops(struct bch_fs *c)
+{
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ int ret;
+
+ ret = bch2_trans_run(c,
+ for_each_btree_key2(trans, iter,
+ BTREE_ID_logged_ops, POS_MIN, BTREE_ITER_PREFETCH, k,
+ resume_logged_op(trans, &iter, k)));
+ if (ret)
+ bch_err_fn(c, ret);
+ return ret;
+}
+
+static int __bch2_logged_op_start(struct btree_trans *trans, struct bkey_i *k)
+{
+ struct btree_iter iter;
+ int ret;
+
+ ret = bch2_bkey_get_empty_slot(trans, &iter, BTREE_ID_logged_ops, POS_MAX);
+ if (ret)
+ return ret;
+
+ k->k.p = iter.pos;
+
+ ret = bch2_trans_update(trans, &iter, k, 0);
+ bch2_trans_iter_exit(trans, &iter);
+ return ret;
+}
+
+int bch2_logged_op_start(struct btree_trans *trans, struct bkey_i *k)
+{
+ return commit_do(trans, NULL, NULL, BTREE_INSERT_NOFAIL,
+ __bch2_logged_op_start(trans, k));
+}
+
+void bch2_logged_op_finish(struct btree_trans *trans, struct bkey_i *k)
+{
+ int ret = commit_do(trans, NULL, NULL, BTREE_INSERT_NOFAIL,
+ bch2_btree_delete(trans, BTREE_ID_logged_ops, k->k.p, 0));
+ /*
+ * This needs to be a fatal error because we've left an unfinished
+ * operation in the logged ops btree.
+ *
+ * We should only ever see an error here if the filesystem has already
+ * been shut down, but make sure of that here:
+ */
+ if (ret) {
+ struct bch_fs *c = trans->c;
+ struct printbuf buf = PRINTBUF;
+
+ bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(k));
+ bch2_fs_fatal_error(c, "%s: error deleting logged operation %s: %s",
+ __func__, buf.buf, bch2_err_str(ret));
+ printbuf_exit(&buf);
+ }
+}