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, 74 insertions, 0 deletions

diff --git a/fs/bcachefs/disk_groups.h b/fs/bcachefs/disk_groups.h
new file mode 100644
index 000000000000..d202eb3a9de6
--- /dev/null
+++ b/fs/bcachefs/disk_groups.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_DISK_GROUPS_H
+#define _BCACHEFS_DISK_GROUPS_H
+
+extern const struct bch_sb_field_ops bch_sb_field_ops_disk_groups;
+
+static inline unsigned disk_groups_nr(struct bch_sb_field_disk_groups *groups)
+{
+	return groups
+		? (vstruct_end(&groups->field) -
+		   (void *) &groups->entries[0]) / sizeof(struct bch_disk_group)
+		: 0;
+}
+
+struct target {
+	enum {
+		TARGET_NULL,
+		TARGET_DEV,
+		TARGET_GROUP,
+	}			type;
+	union {
+		unsigned	dev;
+		unsigned	group;
+	};
+};
+
+#define TARGET_DEV_START	1
+#define TARGET_GROUP_START	(256 + TARGET_DEV_START)
+
+static inline u16 dev_to_target(unsigned dev)
+{
+	return TARGET_DEV_START + dev;
+}
+
+static inline u16 group_to_target(unsigned group)
+{
+	return TARGET_GROUP_START + group;
+}
+
+static inline struct target target_decode(unsigned target)
+{
+	if (target >= TARGET_GROUP_START)
+		return (struct target) {
+			.type	= TARGET_GROUP,
+			.group	= target - TARGET_GROUP_START
+		};
+
+	if (target >= TARGET_DEV_START)
+		return (struct target) {
+			.type	= TARGET_DEV,
+			.group	= target - TARGET_DEV_START
+		};
+
+	return (struct target) { .type = TARGET_NULL };
+}
+
+const struct bch_devs_mask *bch2_target_to_mask(struct bch_fs *, unsigned);
+bool bch2_dev_in_target(struct bch_fs *, unsigned, unsigned);
+
+int bch2_disk_path_find(struct bch_sb_handle *, const char *);
+int bch2_disk_path_find_or_create(struct bch_sb_handle *, const char *);
+int bch2_disk_path_print(struct bch_sb_handle *, char *, size_t, unsigned);
+
+int bch2_opt_target_parse(struct bch_fs *, const char *, u64 *);
+int bch2_opt_target_print(struct bch_fs *, char *, size_t, u64);
+
+int bch2_sb_disk_groups_to_cpu(struct bch_fs *);
+
+int bch2_dev_group_set(struct bch_fs *, struct bch_dev *, const char *);
+
+const char *bch2_sb_validate_disk_groups(struct bch_sb *,
+					 struct bch_sb_field *);
+
+#endif /* _BCACHEFS_DISK_GROUPS_H */