/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_EC_FORMAT_H
#define _BCACHEFS_EC_FORMAT_H

#include "data/extents_format.h"

struct bch_stripe {
	struct bch_val		v;
	__le16			sectors;
	/*
	 * can_widen: how many additional data blocks this stripe could grow
	 * into if reused at the current pool's wider target geometry.
	 * 3 bits = 0..7, saturating - writers must clamp.
	 */
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u8			algorithm:4;
	__u8			needs_reconcile:1;
	__u8			can_widen:3;
#else
	__u8			can_widen:3;
	__u8			needs_reconcile:1;
	__u8			algorithm:4;
#endif
	__u8			nr_blocks;
	__u8			nr_redundant;

	__u8			csum_granularity_bits;
	__u8			csum_type;

	/*
	 * XXX: targets should be 16 bits - fix this if we ever do a stripe_v2
	 *
	 * we can manage with this because this only needs to point to a
	 * disk label, not a target:
	 */
	__u8			disk_label;

	/*
	 * Variable length sections:
	 * - Pointers
	 * - Checksums
	 *   2D array of [stripe block/device][csum block], with checksum block
	 *   size given by csum_granularity_bits
	 * - Block sector counts: per-block array of u16s
	 *
	 * XXX:
	 * Either checksums should have come last, or we should have included a
	 * checksum_size field (the size in bytes of the checksum itself, not
	 * the blocksize the checksum covers).
	 *
	 * Currently we aren't able to access the block sector counts if the
	 * checksum type is unknown.
	 */

	struct bch_extent_ptr	ptrs[];
} __packed __aligned(8);

#endif /* _BCACHEFS_EC_FORMAT_H */
