bcachefs: Initial commit

Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write
filesystem with every feature you could possibly want.

Website: https://bcachefs.org

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 52 insertions, 0 deletions

diff --git a/fs/bcachefs/replicas.h b/fs/bcachefs/replicas.h
new file mode 100644
index 000000000000..de506cf9e11d
--- /dev/null
+++ b/fs/bcachefs/replicas.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_REPLICAS_H
+#define _BCACHEFS_REPLICAS_H
+
+bool bch2_replicas_marked(struct bch_fs *, enum bch_data_type,
+			  struct bch_devs_list);
+bool bch2_bkey_replicas_marked(struct bch_fs *, enum bch_data_type,
+			       struct bkey_s_c);
+int bch2_mark_replicas(struct bch_fs *, enum bch_data_type,
+		       struct bch_devs_list);
+int bch2_mark_bkey_replicas(struct bch_fs *, enum bch_data_type,
+			    struct bkey_s_c);
+
+int bch2_cpu_replicas_to_text(struct bch_replicas_cpu *, char *, size_t);
+int bch2_sb_replicas_to_text(struct bch_sb_field_replicas *, char *, size_t);
+
+struct replicas_status {
+	struct {
+		unsigned	nr_online;
+		unsigned	nr_offline;
+	}			replicas[BCH_DATA_NR];
+};
+
+struct replicas_status __bch2_replicas_status(struct bch_fs *,
+					      struct bch_devs_mask);
+struct replicas_status bch2_replicas_status(struct bch_fs *);
+bool bch2_have_enough_devs(struct replicas_status, unsigned);
+
+unsigned bch2_replicas_online(struct bch_fs *, bool);
+unsigned bch2_dev_has_data(struct bch_fs *, struct bch_dev *);
+
+int bch2_replicas_gc_end(struct bch_fs *, int);
+int bch2_replicas_gc_start(struct bch_fs *, unsigned);
+
+/* iterate over superblock replicas - used by userspace tools: */
+
+static inline struct bch_replicas_entry *
+replicas_entry_next(struct bch_replicas_entry *i)
+{
+	return (void *) i + offsetof(struct bch_replicas_entry, devs) + i->nr;
+}
+
+#define for_each_replicas_entry(_r, _i)					\
+	for (_i = (_r)->entries;					\
+	     (void *) (_i) < vstruct_end(&(_r)->field) && (_i)->data_type;\
+	     (_i) = replicas_entry_next(_i))
+
+int bch2_sb_replicas_to_cpu_replicas(struct bch_fs *);
+
+extern const struct bch_sb_field_ops bch_sb_field_ops_replicas;
+
+#endif /* _BCACHEFS_REPLICAS_H */