#ifndef _NFSD_BLOCKLAYOUTXDR_H
  #define _NFSD_BLOCKLAYOUTXDR_H 1
  
  #include <linux/blkdev.h>
  #include "xdr4.h"
  
  struct iomap;
  struct xdr_stream;

  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;
  };

  /*
   * 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[];
  };
  
  __be32 nfsd4_block_encode_getdeviceinfo(struct xdr_stream *xdr,
  		struct nfsd4_getdeviceinfo *gdp);
  __be32 nfsd4_block_encode_layoutget(struct xdr_stream *xdr,
  		struct nfsd4_layoutget *lgp);
  int nfsd4_block_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
  		u32 block_size);

  int nfsd4_scsi_decode_layoutupdate(__be32 *p, u32 len, struct iomap **iomapp,
  		u32 block_size);

  
  #endif /* _NFSD_BLOCKLAYOUTXDR_H */