move Rust sources to top level, C sources into c_src

[bcachefs-tools-debian] / c_src / libbcachefs / logged_ops.c

diff --git a/c_src/libbcachefs/logged_ops.c b/c_src/libbcachefs/logged_ops.c
new file mode 100644 (file)
index 0000000..ad59810
--- /dev/null
+++ b/c_src/libbcachefs/logged_ops.c
@@ -0,0 +1,108 @@
+// 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)
+{
+       int ret = bch2_trans_run(c,
+               for_each_btree_key(trans, iter,
+                                  BTREE_ID_logged_ops, POS_MIN,
+                                  BTREE_ITER_PREFETCH, k,
+                       resume_logged_op(trans, &iter, k)));
+       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, BCH_TRANS_COMMIT_no_enospc,
+                        __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, BCH_TRANS_COMMIT_no_enospc,
+                           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);
+       }
+}