1 files changed, 73 insertions, 0 deletions
diff --git a/fs/bcachefs/compress.h b/fs/bcachefs/compress.h
new file mode 100644
index 0000000000..607fd5e232
--- /dev/null
+++ b/fs/bcachefs/compress.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_COMPRESS_H
+#define _BCACHEFS_COMPRESS_H
+
+#include "extents_types.h"
+
+static const unsigned __bch2_compression_opt_to_type[] = {
+#define x(t, n) [BCH_COMPRESSION_OPT_##t] = BCH_COMPRESSION_TYPE_##t,
+	BCH_COMPRESSION_OPTS()
+#undef x
+};
+
+struct bch_compression_opt {
+	u8		type:4,
+			level:4;
+};
+
+static inline struct bch_compression_opt __bch2_compression_decode(unsigned v)
+{
+	return (struct bch_compression_opt) {
+		.type	= v & 15,
+		.level	= v >> 4,
+	};
+}
+
+static inline bool bch2_compression_opt_valid(unsigned v)
+{
+	struct bch_compression_opt opt = __bch2_compression_decode(v);
+
+	return opt.type < ARRAY_SIZE(__bch2_compression_opt_to_type) && !(!opt.type && opt.level);
+}
+
+static inline struct bch_compression_opt bch2_compression_decode(unsigned v)
+{
+	return bch2_compression_opt_valid(v)
+		? __bch2_compression_decode(v)
+		: (struct bch_compression_opt) { 0 };
+}
+
+static inline unsigned bch2_compression_encode(struct bch_compression_opt opt)
+{
+	return opt.type|(opt.level << 4);
+}
+
+static inline enum bch_compression_type bch2_compression_opt_to_type(unsigned v)
+{
+	return __bch2_compression_opt_to_type[bch2_compression_decode(v).type];
+}
+
+int bch2_bio_uncompress_inplace(struct bch_fs *, struct bio *,
+				struct bch_extent_crc_unpacked *);
+int bch2_bio_uncompress(struct bch_fs *, struct bio *, struct bio *,
+		       struct bvec_iter, struct bch_extent_crc_unpacked);
+unsigned bch2_bio_compress(struct bch_fs *, struct bio *, size_t *,
+			   struct bio *, size_t *, unsigned);
+
+int bch2_check_set_has_compressed_data(struct bch_fs *, unsigned);
+void bch2_fs_compress_exit(struct bch_fs *);
+int bch2_fs_compress_init(struct bch_fs *);
+
+void bch2_compression_opt_to_text(struct printbuf *, u64);
+
+int bch2_opt_compression_parse(struct bch_fs *, const char *, u64 *, struct printbuf *);
+void bch2_opt_compression_to_text(struct printbuf *, struct bch_fs *, struct bch_sb *, u64);
+int bch2_opt_compression_validate(u64, struct printbuf *);
+
+#define bch2_opt_compression (struct bch_opt_fn) {		\
+	.parse		= bch2_opt_compression_parse,		\
+	.to_text	= bch2_opt_compression_to_text,		\
+	.validate	= bch2_opt_compression_validate,	\
+}
+
+#endif /* _BCACHEFS_COMPRESS_H */