/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NFSD_BLOCKLAYOUTXDR_H
#define _NFSD_BLOCKLAYOUTXDR_H 1

#include <linux/blkdev.h>
#include "xdr4.h"

struct iomap;
struct xdr_stream;

/* On the wire size of the layout4 struct with zero number of extents */
#define PNFS_BLOCK_LAYOUT4_SIZE \
	(sizeof(__be32) * 2 +	/* offset4 */ \
	 sizeof(__be32) * 2 +	/* length4 */ \
	 sizeof(__be32) +	/* layoutiomode4 */ \
	 sizeof(__be32) +	/* layouttype4 */ \
	 sizeof(__be32) +	/* number of bytes */ \
	 sizeof(__be32))	/* number of extents */

struct pnfs_block_extent {
	struct nfsd4_deviceid		vol_id;
	u64				foff;
	u64				len;
	u64				soff;
	enum pnfs_block_extent_state	es;
};

struct pnfs_block_range {
	u64				foff;
	u64				len;
};

struct pnfs_block_layout {
	u32				nr_extents;
	struct pnfs_block_extent	extents[] __counted_by(nr_extents);
};

/*
 * Random upper cap for the uuid length to avoid unbounded allocation.
 * Not actually limited by the protocol.
 */
#define PNFS_BLOCK_UUID_LEN	128

struct pnfs_block_volume {
	enum pnfs_block_volume_type	type;
	union {
		struct {
			u64		offset;
			u32		sig_len;
			u8		sig[PNFS_BLOCK_UUID_LEN];
		} simple;
		struct {
			enum scsi_code_set		code_set;
			enum scsi_designator_type	designator_type;
			int				designator_len;
			u8				designator[256];
			u64				pr_key;
		} scsi;
	};
};

struct pnfs_block_deviceaddr {
	u32				nr_volumes;
	struct pnfs_block_volume	volumes[] __counted_by(nr_volumes);
};

__be32 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
		const struct nfsd4_getdeviceinfo *gdp);
__be32 nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
		const struct nfsd4_layoutget *lgp);
__be32 nfsd4_block_decode_layoutupdate(struct xdr_stream *xdr,
		struct iomap **iomapp, int *nr_iomapsp, u32 block_size);
__be32 nfsd4_scsi_decode_layoutupdate(struct xdr_stream *xdr,
		struct iomap **iomapp, int *nr_iomapsp, u32 block_size);

#endif /* _NFSD_BLOCKLAYOUTXDR_H */