text: /* SPDX-License-Identifier: GPL-2.0 */
  #ifndef _LINUX_NFS_XDR_H
  #define _LINUX_NFS_XDR_H
  
  #include <linux/nfsacl.h>
  #include <linux/sunrpc/gss_api.h>
  
  /*
   * To change the maximum rsize and wsize supported by the NFS client, adjust
   * NFS_MAX_FILE_IO_SIZE.  64KB is a typical maximum, but some servers can
   * support a megabyte or more.  The default is left at 4096 bytes, which is
   * reasonable for NFS over UDP.
   */
  #define NFS_MAX_FILE_IO_SIZE	(1048576U)
  #define NFS_DEF_FILE_IO_SIZE	(4096U)
  #define NFS_MIN_FILE_IO_SIZE	(1024U)
  
  struct nfs4_string {
  	unsigned int len;
  	char *data;
  };
  
  struct nfs_fsid {
  	uint64_t		major;
  	uint64_t		minor;
  };
  
  /*
   * Helper for checking equality between 2 fsids.
   */
  static inline int nfs_fsid_equal(const struct nfs_fsid *a, const struct nfs_fsid *b)
  {
  	return a->major == b->major && a->minor == b->minor;
  }
  
  struct nfs4_threshold {
  	__u32	bm;
  	__u32	l_type;
  	__u64	rd_sz;
  	__u64	wr_sz;
  	__u64	rd_io_sz;
  	__u64	wr_io_sz;
  };
  
  struct nfs_fattr {
  	unsigned int		valid;		/* which fields are valid */
  	umode_t			mode;
  	__u32			nlink;
  	kuid_t			uid;
  	kgid_t			gid;
  	dev_t			rdev;
  	__u64			size;
  	union {
  		struct {
  			__u32	blocksize;
  			__u32	blocks;
  		} nfs2;
  		struct {
  			__u64	used;
  		} nfs3;
  	} du;
  	struct nfs_fsid		fsid;
  	__u64			fileid;
  	__u64			mounted_on_fileid;
  	struct timespec		atime;
  	struct timespec		mtime;
  	struct timespec		ctime;
  	__u64			change_attr;	/* NFSv4 change attribute */
  	__u64			pre_change_attr;/* pre-op NFSv4 change attribute */
  	__u64			pre_size;	/* pre_op_attr.size	  */
  	struct timespec		pre_mtime;	/* pre_op_attr.mtime	  */
  	struct timespec		pre_ctime;	/* pre_op_attr.ctime	  */
  	unsigned long		time_start;
  	unsigned long		gencount;
  	struct nfs4_string	*owner_name;
  	struct nfs4_string	*group_name;
  	struct nfs4_threshold	*mdsthreshold;	/* pNFS threshold hints */
  };
  
  #define NFS_ATTR_FATTR_TYPE		(1U << 0)
  #define NFS_ATTR_FATTR_MODE		(1U << 1)
  #define NFS_ATTR_FATTR_NLINK		(1U << 2)
  #define NFS_ATTR_FATTR_OWNER		(1U << 3)
  #define NFS_ATTR_FATTR_GROUP		(1U << 4)
  #define NFS_ATTR_FATTR_RDEV		(1U << 5)
  #define NFS_ATTR_FATTR_SIZE		(1U << 6)
  #define NFS_ATTR_FATTR_PRESIZE		(1U << 7)
  #define NFS_ATTR_FATTR_BLOCKS_USED	(1U << 8)
  #define NFS_ATTR_FATTR_SPACE_USED	(1U << 9)
  #define NFS_ATTR_FATTR_FSID		(1U << 10)
  #define NFS_ATTR_FATTR_FILEID		(1U << 11)
  #define NFS_ATTR_FATTR_ATIME		(1U << 12)
  #define NFS_ATTR_FATTR_MTIME		(1U << 13)
  #define NFS_ATTR_FATTR_CTIME		(1U << 14)
  #define NFS_ATTR_FATTR_PREMTIME		(1U << 15)
  #define NFS_ATTR_FATTR_PRECTIME		(1U << 16)
  #define NFS_ATTR_FATTR_CHANGE		(1U << 17)
  #define NFS_ATTR_FATTR_PRECHANGE	(1U << 18)
  #define NFS_ATTR_FATTR_V4_LOCATIONS	(1U << 19)
  #define NFS_ATTR_FATTR_V4_REFERRAL	(1U << 20)
  #define NFS_ATTR_FATTR_MOUNTPOINT	(1U << 21)
  #define NFS_ATTR_FATTR_MOUNTED_ON_FILEID (1U << 22)
  #define NFS_ATTR_FATTR_OWNER_NAME	(1U << 23)
  #define NFS_ATTR_FATTR_GROUP_NAME	(1U << 24)
  #define NFS_ATTR_FATTR_V4_SECURITY_LABEL (1U << 25)
  
  #define NFS_ATTR_FATTR (NFS_ATTR_FATTR_TYPE \
  		| NFS_ATTR_FATTR_MODE \
  		| NFS_ATTR_FATTR_NLINK \
  		| NFS_ATTR_FATTR_OWNER \
  		| NFS_ATTR_FATTR_GROUP \
  		| NFS_ATTR_FATTR_RDEV \
  		| NFS_ATTR_FATTR_SIZE \
  		| NFS_ATTR_FATTR_FSID \
  		| NFS_ATTR_FATTR_FILEID \
  		| NFS_ATTR_FATTR_ATIME \
  		| NFS_ATTR_FATTR_MTIME \
  		| NFS_ATTR_FATTR_CTIME \
  		| NFS_ATTR_FATTR_CHANGE)
  #define NFS_ATTR_FATTR_V2 (NFS_ATTR_FATTR \
  		| NFS_ATTR_FATTR_BLOCKS_USED)
  #define NFS_ATTR_FATTR_V3 (NFS_ATTR_FATTR \
  		| NFS_ATTR_FATTR_SPACE_USED)
  #define NFS_ATTR_FATTR_V4 (NFS_ATTR_FATTR \
  		| NFS_ATTR_FATTR_SPACE_USED \
  		| NFS_ATTR_FATTR_V4_SECURITY_LABEL)
  
  /*
   * Maximal number of supported layout drivers.
   */
  #define NFS_MAX_LAYOUT_TYPES 8
  
  /*
   * Info on the file system
   */
  struct nfs_fsinfo {
  	struct nfs_fattr	*fattr; /* Post-op attributes */
  	__u32			rtmax;	/* max.  read transfer size */
  	__u32			rtpref;	/* pref. read transfer size */
  	__u32			rtmult;	/* reads should be multiple of this */
  	__u32			wtmax;	/* max.  write transfer size */
  	__u32			wtpref;	/* pref. write transfer size */
  	__u32			wtmult;	/* writes should be multiple of this */
  	__u32			dtpref;	/* pref. readdir transfer size */
  	__u64			maxfilesize;
  	struct timespec		time_delta; /* server time granularity */
  	__u32			lease_time; /* in seconds */
  	__u32			nlayouttypes; /* number of layouttypes */
  	__u32			layouttype[NFS_MAX_LAYOUT_TYPES]; /* supported pnfs layout driver */
  	__u32			blksize; /* preferred pnfs io block size */
  	__u32			clone_blksize; /* granularity of a CLONE operation */
  };
  
  struct nfs_fsstat {
  	struct nfs_fattr	*fattr; /* Post-op attributes */
  	__u64			tbytes;	/* total size in bytes */
  	__u64			fbytes;	/* # of free bytes */
  	__u64			abytes;	/* # of bytes available to user */
  	__u64			tfiles;	/* # of files */
  	__u64			ffiles;	/* # of free files */
  	__u64			afiles;	/* # of files available to user */
  };
  
  struct nfs2_fsstat {
  	__u32			tsize;  /* Server transfer size */
  	__u32			bsize;  /* Filesystem block size */
  	__u32			blocks; /* No. of "bsize" blocks on filesystem */
  	__u32			bfree;  /* No. of free "bsize" blocks */
  	__u32			bavail; /* No. of available "bsize" blocks */
  };
  
  struct nfs_pathconf {
  	struct nfs_fattr	*fattr; /* Post-op attributes */
  	__u32			max_link; /* max # of hard links */
  	__u32			max_namelen; /* max name length */
  };
  
  struct nfs4_change_info {
  	u32			atomic;
  	u64			before;
  	u64			after;
  };
  
  struct nfs_seqid;
  
  /* nfs41 sessions channel attributes */
  struct nfs4_channel_attrs {
  	u32			max_rqst_sz;
  	u32			max_resp_sz;
  	u32			max_resp_sz_cached;
  	u32			max_ops;
  	u32			max_reqs;
  };
  
  struct nfs4_slot;
  struct nfs4_sequence_args {
  	struct nfs4_slot	*sa_slot;
  	u8			sa_cache_this : 1,
  				sa_privileged : 1;
  };
  
  struct nfs4_sequence_res {
  	struct nfs4_slot	*sr_slot;	/* slot used to send request */
  	unsigned long		sr_timestamp;
  	int			sr_status;	/* sequence operation status */
  	u32			sr_status_flags;
  	u32			sr_highest_slotid;
  	u32			sr_target_highest_slotid;
  };
  
  struct nfs4_get_lease_time_args {
  	struct nfs4_sequence_args	la_seq_args;
  };
  
  struct nfs4_get_lease_time_res {
  	struct nfs4_sequence_res	lr_seq_res;
  	struct nfs_fsinfo	       *lr_fsinfo;
  };
  
  struct xdr_stream;
  struct nfs4_xdr_opaque_data;
  
  struct nfs4_xdr_opaque_ops {
  	void (*encode)(struct xdr_stream *, const void *args,
  			const struct nfs4_xdr_opaque_data *);
  	void (*free)(struct nfs4_xdr_opaque_data *);
  };
  
  struct nfs4_xdr_opaque_data {
  	const struct nfs4_xdr_opaque_ops *ops;
  	void *data;
  };
  
  #define PNFS_LAYOUT_MAXSIZE 4096
  
  struct nfs4_layoutdriver_data {
  	struct page **pages;
  	__u32 pglen;
  	__u32 len;
  };
  
  struct pnfs_layout_range {
  	u32 iomode;
  	u64 offset;
  	u64 length;
  };
  
  struct nfs4_layoutget_args {
  	struct nfs4_sequence_args seq_args;
  	__u32 type;
  	struct pnfs_layout_range range;
  	__u64 minlength;
  	__u32 maxcount;
  	struct inode *inode;
  	struct nfs_open_context *ctx;
  	nfs4_stateid stateid;
  	struct nfs4_layoutdriver_data layout;
  };
  
  struct nfs4_layoutget_res {
  	struct nfs4_sequence_res seq_res;
  	__u32 return_on_close;
  	struct pnfs_layout_range range;
  	__u32 type;
  	nfs4_stateid stateid;
  	struct nfs4_layoutdriver_data *layoutp;
  };
  
  struct nfs4_layoutget {
  	struct nfs4_layoutget_args args;
  	struct nfs4_layoutget_res res;
  	struct rpc_cred *cred;
  	gfp_t gfp_flags;
  };
  
  struct nfs4_getdeviceinfo_args {
  	struct nfs4_sequence_args seq_args;
  	struct pnfs_device *pdev;
  	__u32 notify_types;
  };
  
  struct nfs4_getdeviceinfo_res {
  	struct nfs4_sequence_res seq_res;
  	struct pnfs_device *pdev;
  	__u32 notification;
  };
  
  struct nfs4_layoutcommit_args {
  	struct nfs4_sequence_args seq_args;
  	nfs4_stateid stateid;
  	__u64 lastbytewritten;
  	struct inode *inode;
  	const u32 *bitmask;
  	size_t layoutupdate_len;
  	struct page *layoutupdate_page;
  	struct page **layoutupdate_pages;
  	__be32 *start_p;
  };
  
  struct nfs4_layoutcommit_res {
  	struct nfs4_sequence_res seq_res;
  	struct nfs_fattr *fattr;
  	const struct nfs_server *server;
  	int status;
  };
  
  struct nfs4_layoutcommit_data {
  	struct rpc_task task;
  	struct nfs_fattr fattr;
  	struct list_head lseg_list;
  	struct rpc_cred *cred;
  	struct inode *inode;
  	struct nfs4_layoutcommit_args args;
  	struct nfs4_layoutcommit_res res;
  };
  
  struct nfs4_layoutreturn_args {
  	struct nfs4_sequence_args seq_args;
  	struct pnfs_layout_hdr *layout;
  	struct inode *inode;
  	struct pnfs_layout_range range;
  	nfs4_stateid stateid;
  	__u32   layout_type;
  	struct nfs4_xdr_opaque_data *ld_private;
  };
  
  struct nfs4_layoutreturn_res {
  	struct nfs4_sequence_res seq_res;
  	u32 lrs_present;
  	nfs4_stateid stateid;
  };
  
  struct nfs4_layoutreturn {
  	struct nfs4_layoutreturn_args args;
  	struct nfs4_layoutreturn_res res;
  	struct rpc_cred *cred;
  	struct nfs_client *clp;
  	struct inode *inode;
  	int rpc_status;
  	struct nfs4_xdr_opaque_data ld_private;
  };
  
  #define PNFS_LAYOUTSTATS_MAXSIZE 256
  
  struct nfs42_layoutstat_args;
  struct nfs42_layoutstat_devinfo;
  typedef	void (*layoutstats_encode_t)(struct xdr_stream *,
  		struct nfs42_layoutstat_args *,
  		struct nfs42_layoutstat_devinfo *);
  
  /* Per file per deviceid layoutstats */
  struct nfs42_layoutstat_devinfo {
  	struct nfs4_deviceid dev_id;
  	__u64 offset;
  	__u64 length;
  	__u64 read_count;
  	__u64 read_bytes;
  	__u64 write_count;
  	__u64 write_bytes;
  	__u32 layout_type;
  	struct nfs4_xdr_opaque_data ld_private;
  };
  
  struct nfs42_layoutstat_args {
  	struct nfs4_sequence_args seq_args;
  	struct nfs_fh *fh;
  	struct inode *inode;
  	nfs4_stateid stateid;
  	int num_dev;
  	struct nfs42_layoutstat_devinfo *devinfo;
  };
  
  struct nfs42_layoutstat_res {
  	struct nfs4_sequence_res seq_res;
  	int num_dev;
  	int rpc_status;
  };
  
  struct nfs42_layoutstat_data {
  	struct inode *inode;
  	struct nfs42_layoutstat_args args;
  	struct nfs42_layoutstat_res res;
  };
  
  struct nfs42_clone_args {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh			*src_fh;
  	struct nfs_fh			*dst_fh;
  	nfs4_stateid			src_stateid;
  	nfs4_stateid			dst_stateid;
  	__u64				src_offset;
  	__u64				dst_offset;
  	__u64				count;
  	const u32			*dst_bitmask;
  };
  
  struct nfs42_clone_res {
  	struct nfs4_sequence_res	seq_res;
  	unsigned int			rpc_status;
  	struct nfs_fattr		*dst_fattr;
  	const struct nfs_server		*server;
  };
  
  struct stateowner_id {
  	__u64	create_time;
  	__u32	uniquifier;
  };
  
  /*
   * Arguments to the open call.
   */
  struct nfs_openargs {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *	fh;
  	struct nfs_seqid *	seqid;
  	int			open_flags;
  	fmode_t			fmode;
  	u32			share_access;
  	u32			access;
  	__u64                   clientid;
  	struct stateowner_id	id;
  	union {
  		struct {
  			struct iattr *  attrs;    /* UNCHECKED, GUARDED, EXCLUSIVE4_1 */
  			nfs4_verifier   verifier; /* EXCLUSIVE */
  		};
  		nfs4_stateid	delegation;		/* CLAIM_DELEGATE_CUR */
  		fmode_t		delegation_type;	/* CLAIM_PREVIOUS */
  	} u;
  	const struct qstr *	name;
  	const struct nfs_server *server;	 /* Needed for ID mapping */
  	const u32 *		bitmask;
  	const u32 *		open_bitmap;
  	enum open_claim_type4	claim;
  	enum createmode4	createmode;
  	const struct nfs4_label *label;
  	umode_t			umask;
  };
  
  struct nfs_openres {
  	struct nfs4_sequence_res	seq_res;
  	nfs4_stateid            stateid;
  	struct nfs_fh           fh;
  	struct nfs4_change_info	cinfo;
  	__u32                   rflags;
  	struct nfs_fattr *      f_attr;
  	struct nfs4_label	*f_label;
  	struct nfs_seqid *	seqid;
  	const struct nfs_server *server;
  	fmode_t			delegation_type;
  	nfs4_stateid		delegation;
  	unsigned long		pagemod_limit;
  	__u32			do_recall;
  	__u32			attrset[NFS4_BITMAP_SIZE];
  	struct nfs4_string	*owner;
  	struct nfs4_string	*group_owner;
  	__u32			access_request;
  	__u32			access_supported;
  	__u32			access_result;
  };
  
  /*
   * Arguments to the open_confirm call.
   */
  struct nfs_open_confirmargs {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *	fh;
  	nfs4_stateid *		stateid;
  	struct nfs_seqid *	seqid;
  };
  
  struct nfs_open_confirmres {
  	struct nfs4_sequence_res	seq_res;
  	nfs4_stateid            stateid;
  	struct nfs_seqid *	seqid;
  };
  
  /*
   * Arguments to the close call.
   */
  struct nfs_closeargs {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh *         fh;
  	nfs4_stateid 		stateid;
  	struct nfs_seqid *	seqid;
  	fmode_t			fmode;
  	u32			share_access;
  	const u32 *		bitmask;
  	struct nfs4_layoutreturn_args *lr_args;
  };
  
  struct nfs_closeres {
  	struct nfs4_sequence_res	seq_res;
  	nfs4_stateid            stateid;
  	struct nfs_fattr *	fattr;
  	struct nfs_seqid *	seqid;
  	const struct nfs_server *server;
  	struct nfs4_layoutreturn_res *lr_res;
  	int lr_ret;
  };
  /*
   *  * Arguments to the lock,lockt, and locku call.
   *   */
  struct nfs_lowner {
  	__u64			clientid;
  	__u64			id;
  	dev_t			s_dev;
  };
  
  struct nfs_lock_args {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh *		fh;
  	struct file_lock *	fl;
  	struct nfs_seqid *	lock_seqid;
  	nfs4_stateid		lock_stateid;
  	struct nfs_seqid *	open_seqid;
  	nfs4_stateid		open_stateid;
  	struct nfs_lowner	lock_owner;
  	unsigned char		block : 1;
  	unsigned char		reclaim : 1;
  	unsigned char		new_lock : 1;
  	unsigned char		new_lock_owner : 1;
  };
  
  struct nfs_lock_res {
  	struct nfs4_sequence_res	seq_res;
  	nfs4_stateid		stateid;
  	struct nfs_seqid *	lock_seqid;
  	struct nfs_seqid *	open_seqid;
  };
  
  struct nfs_locku_args {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh *		fh;
  	struct file_lock *	fl;
  	struct nfs_seqid *	seqid;
  	nfs4_stateid 		stateid;
  };
  
  struct nfs_locku_res {
  	struct nfs4_sequence_res	seq_res;
  	nfs4_stateid		stateid;
  	struct nfs_seqid *	seqid;
  };
  
  struct nfs_lockt_args {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh *		fh;
  	struct file_lock *	fl;
  	struct nfs_lowner	lock_owner;
  };
  
  struct nfs_lockt_res {
  	struct nfs4_sequence_res	seq_res;
  	struct file_lock *	denied; /* LOCK, LOCKT failed */
  };
  
  struct nfs_release_lockowner_args {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_lowner	lock_owner;
  };
  
  struct nfs_release_lockowner_res {
  	struct nfs4_sequence_res	seq_res;
  };
  
  struct nfs4_delegreturnargs {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *fhandle;
  	const nfs4_stateid *stateid;
  	const u32 * bitmask;
  	struct nfs4_layoutreturn_args *lr_args;
  };
  
  struct nfs4_delegreturnres {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs_fattr * fattr;
  	struct nfs_server *server;
  	struct nfs4_layoutreturn_res *lr_res;
  	int lr_ret;
  };
  
  /*
   * Arguments to the write call.
   */
  struct nfs_write_verifier {
  	char			data[8];
  };
  
  struct nfs_writeverf {
  	struct nfs_write_verifier verifier;
  	enum nfs3_stable_how	committed;
  };
  
  /*
   * Arguments shared by the read and write call.
   */
  struct nfs_pgio_args {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh *		fh;
  	struct nfs_open_context *context;
  	struct nfs_lock_context *lock_context;
  	nfs4_stateid		stateid;
  	__u64			offset;
  	__u32			count;
  	unsigned int		pgbase;
  	struct page **		pages;
  	const u32 *		bitmask;	/* used by write */
  	enum nfs3_stable_how	stable;		/* used by write */
  };
  
  struct nfs_pgio_res {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs_fattr *	fattr;
  	__u32			count;
  	__u32			op_status;
  	int			eof;		/* used by read */
  	struct nfs_writeverf *	verf;		/* used by write */
  	const struct nfs_server *server;	/* used by write */
  
  };
  
  /*
   * Arguments to the commit call.
   */
  struct nfs_commitargs {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh		*fh;
  	__u64			offset;
  	__u32			count;
  	const u32		*bitmask;
  };
  
  struct nfs_commitres {
  	struct nfs4_sequence_res	seq_res;
  	__u32			op_status;
  	struct nfs_fattr	*fattr;
  	struct nfs_writeverf	*verf;
  	const struct nfs_server *server;
  };
  
  /*
   * Common arguments to the unlink call
   */
  struct nfs_removeargs {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh	*fh;
  	struct qstr		name;
  };
  
  struct nfs_removeres {
  	struct nfs4_sequence_res 	seq_res;
  	struct nfs_server *server;
  	struct nfs_fattr	*dir_attr;
  	struct nfs4_change_info	cinfo;
  };
  
  /*
   * Common arguments to the rename call
   */
  struct nfs_renameargs {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh		*old_dir;
  	const struct nfs_fh		*new_dir;
  	const struct qstr		*old_name;
  	const struct qstr		*new_name;
  };
  
  struct nfs_renameres {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs_server		*server;
  	struct nfs4_change_info		old_cinfo;
  	struct nfs_fattr		*old_fattr;
  	struct nfs4_change_info		new_cinfo;
  	struct nfs_fattr		*new_fattr;
  };
  
  /* parsed sec= options */
  #define NFS_AUTH_INFO_MAX_FLAVORS 12 /* see fs/nfs/super.c */
  struct nfs_auth_info {
  	unsigned int            flavor_len;
  	rpc_authflavor_t        flavors[NFS_AUTH_INFO_MAX_FLAVORS];
  };
  
  /*
   * Argument struct for decode_entry function
   */
  struct nfs_entry {
  	__u64			ino;
  	__u64			cookie,
  				prev_cookie;
  	const char *		name;
  	unsigned int		len;
  	int			eof;
  	struct nfs_fh *		fh;
  	struct nfs_fattr *	fattr;
  	struct nfs4_label  *label;
  	unsigned char		d_type;
  	struct nfs_server *	server;
  };
  
  /*
   * The following types are for NFSv2 only.
   */
  struct nfs_sattrargs {
  	struct nfs_fh *		fh;
  	struct iattr *		sattr;
  };
  
  struct nfs_diropargs {
  	struct nfs_fh *		fh;
  	const char *		name;
  	unsigned int		len;
  };
  
  struct nfs_createargs {
  	struct nfs_fh *		fh;
  	const char *		name;
  	unsigned int		len;
  	struct iattr *		sattr;
  };
  
  struct nfs_setattrargs {
  	struct nfs4_sequence_args 	seq_args;
  	struct nfs_fh *                 fh;
  	nfs4_stateid                    stateid;
  	struct iattr *                  iap;
  	const struct nfs_server *	server; /* Needed for name mapping */
  	const u32 *			bitmask;
  	const struct nfs4_label		*label;
  };
  
  struct nfs_setaclargs {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh *			fh;
  	size_t				acl_len;
  	struct page **			acl_pages;
  };
  
  struct nfs_setaclres {
  	struct nfs4_sequence_res	seq_res;
  };
  
  struct nfs_getaclargs {
  	struct nfs4_sequence_args 	seq_args;
  	struct nfs_fh *			fh;
  	size_t				acl_len;
  	struct page **			acl_pages;
  };
  
  /* getxattr ACL interface flags */
  #define NFS4_ACL_TRUNC		0x0001	/* ACL was truncated */
  struct nfs_getaclres {
  	struct nfs4_sequence_res	seq_res;
  	size_t				acl_len;
  	size_t				acl_data_offset;
  	int				acl_flags;
  	struct page *			acl_scratch;
  };
  
  struct nfs_setattrres {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs_fattr *              fattr;
  	struct nfs4_label		*label;
  	const struct nfs_server *	server;
  };
  
  struct nfs_linkargs {
  	struct nfs_fh *		fromfh;
  	struct nfs_fh *		tofh;
  	const char *		toname;
  	unsigned int		tolen;
  };
  
  struct nfs_symlinkargs {
  	struct nfs_fh *		fromfh;
  	const char *		fromname;
  	unsigned int		fromlen;
  	struct page **		pages;
  	unsigned int		pathlen;
  	struct iattr *		sattr;
  };
  
  struct nfs_readdirargs {
  	struct nfs_fh *		fh;
  	__u32			cookie;
  	unsigned int		count;
  	struct page **		pages;
  };
  
  struct nfs3_getaclargs {
  	struct nfs_fh *		fh;
  	int			mask;
  	struct page **		pages;
  };
  
  struct nfs3_setaclargs {
  	struct inode *		inode;
  	int			mask;
  	struct posix_acl *	acl_access;
  	struct posix_acl *	acl_default;
  	size_t			len;
  	unsigned int		npages;
  	struct page **		pages;
  };
  
  struct nfs_diropok {
  	struct nfs_fh *		fh;
  	struct nfs_fattr *	fattr;
  };
  
  struct nfs_readlinkargs {
  	struct nfs_fh *		fh;
  	unsigned int		pgbase;
  	unsigned int		pglen;
  	struct page **		pages;
  };
  
  struct nfs3_sattrargs {
  	struct nfs_fh *		fh;
  	struct iattr *		sattr;
  	unsigned int		guard;
  	struct timespec		guardtime;
  };
  
  struct nfs3_diropargs {
  	struct nfs_fh *		fh;
  	const char *		name;
  	unsigned int		len;
  };
  
  struct nfs3_accessargs {
  	struct nfs_fh *		fh;
  	__u32			access;
  };
  
  struct nfs3_createargs {
  	struct nfs_fh *		fh;
  	const char *		name;
  	unsigned int		len;
  	struct iattr *		sattr;
  	enum nfs3_createmode	createmode;
  	__be32			verifier[2];
  };
  
  struct nfs3_mkdirargs {
  	struct nfs_fh *		fh;
  	const char *		name;
  	unsigned int		len;
  	struct iattr *		sattr;
  };
  
  struct nfs3_symlinkargs {
  	struct nfs_fh *		fromfh;
  	const char *		fromname;
  	unsigned int		fromlen;
  	struct page **		pages;
  	unsigned int		pathlen;
  	struct iattr *		sattr;
  };
  
  struct nfs3_mknodargs {
  	struct nfs_fh *		fh;
  	const char *		name;
  	unsigned int		len;
  	enum nfs3_ftype		type;
  	struct iattr *		sattr;
  	dev_t			rdev;
  };
  
  struct nfs3_linkargs {
  	struct nfs_fh *		fromfh;
  	struct nfs_fh *		tofh;
  	const char *		toname;
  	unsigned int		tolen;
  };
  
  struct nfs3_readdirargs {
  	struct nfs_fh *		fh;
  	__u64			cookie;
  	__be32			verf[2];
  	bool			plus;
  	unsigned int            count;
  	struct page **		pages;
  };
  
  struct nfs3_diropres {
  	struct nfs_fattr *	dir_attr;
  	struct nfs_fh *		fh;
  	struct nfs_fattr *	fattr;
  };
  
  struct nfs3_accessres {
  	struct nfs_fattr *	fattr;
  	__u32			access;
  };
  
  struct nfs3_readlinkargs {
  	struct nfs_fh *		fh;
  	unsigned int		pgbase;
  	unsigned int		pglen;
  	struct page **		pages;
  };
  
  struct nfs3_linkres {
  	struct nfs_fattr *	dir_attr;
  	struct nfs_fattr *	fattr;
  };
  
  struct nfs3_readdirres {
  	struct nfs_fattr *	dir_attr;
  	__be32 *		verf;
  	bool			plus;
  };
  
  struct nfs3_getaclres {
  	struct nfs_fattr *	fattr;
  	int			mask;
  	unsigned int		acl_access_count;
  	unsigned int		acl_default_count;
  	struct posix_acl *	acl_access;
  	struct posix_acl *	acl_default;
  };
  
  #if IS_ENABLED(CONFIG_NFS_V4)
  
  typedef u64 clientid4;
  
  struct nfs4_accessargs {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *		fh;
  	const u32 *			bitmask;
  	u32				access;
  };
  
  struct nfs4_accessres {
  	struct nfs4_sequence_res	seq_res;
  	const struct nfs_server *	server;
  	struct nfs_fattr *		fattr;
  	u32				supported;
  	u32				access;
  };
  
  struct nfs4_create_arg {
  	struct nfs4_sequence_args 	seq_args;
  	u32				ftype;
  	union {
  		struct {
  			struct page **	pages;
  			unsigned int	len;
  		} symlink;   /* NF4LNK */
  		struct {
  			u32		specdata1;
  			u32		specdata2;
  		} device;    /* NF4BLK, NF4CHR */
  	} u;
  	const struct qstr *		name;
  	const struct nfs_server *	server;
  	const struct iattr *		attrs;
  	const struct nfs_fh *		dir_fh;
  	const u32 *			bitmask;
  	const struct nfs4_label		*label;
  	umode_t				umask;
  };
  
  struct nfs4_create_res {
  	struct nfs4_sequence_res	seq_res;
  	const struct nfs_server *	server;
  	struct nfs_fh *			fh;
  	struct nfs_fattr *		fattr;
  	struct nfs4_label		*label;
  	struct nfs4_change_info		dir_cinfo;
  };
  
  struct nfs4_fsinfo_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *		fh;
  	const u32 *			bitmask;
  };
  
  struct nfs4_fsinfo_res {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs_fsinfo	       *fsinfo;
  };
  
  struct nfs4_getattr_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *		fh;
  	const u32 *			bitmask;
  };
  
  struct nfs4_getattr_res {
  	struct nfs4_sequence_res	seq_res;
  	const struct nfs_server *	server;
  	struct nfs_fattr *		fattr;
  	struct nfs4_label		*label;
  };
  
  struct nfs4_link_arg {
  	struct nfs4_sequence_args 	seq_args;
  	const struct nfs_fh *		fh;
  	const struct nfs_fh *		dir_fh;
  	const struct qstr *		name;
  	const u32 *			bitmask;
  };
  
  struct nfs4_link_res {
  	struct nfs4_sequence_res	seq_res;
  	const struct nfs_server *	server;
  	struct nfs_fattr *		fattr;
  	struct nfs4_label		*label;
  	struct nfs4_change_info		cinfo;
  	struct nfs_fattr *		dir_attr;
  };
  
  struct nfs4_lookup_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *		dir_fh;
  	const struct qstr *		name;
  	const u32 *			bitmask;
  };
  
  struct nfs4_lookup_res {
  	struct nfs4_sequence_res	seq_res;
  	const struct nfs_server *	server;
  	struct nfs_fattr *		fattr;
  	struct nfs_fh *			fh;
  	struct nfs4_label		*label;
  };
  
  struct nfs4_lookupp_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh		*fh;
  	const u32			*bitmask;
  };
  
  struct nfs4_lookupp_res {
  	struct nfs4_sequence_res	seq_res;
  	const struct nfs_server		*server;
  	struct nfs_fattr		*fattr;
  	struct nfs_fh			*fh;
  	struct nfs4_label		*label;
  };
  
  struct nfs4_lookup_root_arg {
  	struct nfs4_sequence_args	seq_args;
  	const u32 *			bitmask;
  };
  
  struct nfs4_pathconf_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *		fh;
  	const u32 *			bitmask;
  };
  
  struct nfs4_pathconf_res {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs_pathconf	       *pathconf;
  };
  
  struct nfs4_readdir_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *		fh;
  	u64				cookie;
  	nfs4_verifier			verifier;
  	u32				count;
  	struct page **			pages;	/* zero-copy data */
  	unsigned int			pgbase;	/* zero-copy data */
  	const u32 *			bitmask;
  	bool				plus;
  };
  
  struct nfs4_readdir_res {
  	struct nfs4_sequence_res	seq_res;
  	nfs4_verifier			verifier;
  	unsigned int			pgbase;
  };
  
  struct nfs4_readlink {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *		fh;
  	unsigned int			pgbase;
  	unsigned int			pglen;   /* zero-copy data */
  	struct page **			pages;   /* zero-copy data */
  };
  
  struct nfs4_readlink_res {
  	struct nfs4_sequence_res	seq_res;
  };
  
  struct nfs4_setclientid {
  	const nfs4_verifier *		sc_verifier;
  	u32				sc_prog;
  	unsigned int			sc_netid_len;
  	char				sc_netid[RPCBIND_MAXNETIDLEN + 1];
  	unsigned int			sc_uaddr_len;
  	char				sc_uaddr[RPCBIND_MAXUADDRLEN + 1];
  	struct nfs_client		*sc_clnt;
  	struct rpc_cred			*sc_cred;
  };
  
  struct nfs4_setclientid_res {
  	u64				clientid;
  	nfs4_verifier			confirm;
  };
  
  struct nfs4_statfs_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *		fh;
  	const u32 *			bitmask;
  };
  
  struct nfs4_statfs_res {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs_fsstat	       *fsstat;
  };
  
  struct nfs4_server_caps_arg {
  	struct nfs4_sequence_args	seq_args;
  	struct nfs_fh		       *fhandle;
  	const u32 *			bitmask;
  };
  
  struct nfs4_server_caps_res {
  	struct nfs4_sequence_res	seq_res;
  	u32				attr_bitmask[3];
  	u32				exclcreat_bitmask[3];
  	u32				acl_bitmask;
  	u32				has_links;
  	u32				has_symlinks;
  	u32				fh_expire_type;
  };
  
  #define NFS4_PATHNAME_MAXCOMPONENTS 512
  struct nfs4_pathname {
  	unsigned int ncomponents;
  	struct nfs4_string components[NFS4_PATHNAME_MAXCOMPONENTS];
  };
  
  #define NFS4_FS_LOCATION_MAXSERVERS 10
  struct nfs4_fs_location {
  	unsigned int nservers;
  	struct nfs4_string servers[NFS4_FS_LOCATION_MAXSERVERS];
  	struct nfs4_pathname rootpath;
  };
  
  #define NFS4_FS_LOCATIONS_MAXENTRIES 10
  struct nfs4_fs_locations {
  	struct nfs_fattr fattr;
  	const struct nfs_server *server;
  	struct nfs4_pathname fs_path;
  	int nlocations;
  	struct nfs4_fs_location locations[NFS4_FS_LOCATIONS_MAXENTRIES];
  };
  
  struct nfs4_fs_locations_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh *dir_fh;
  	const struct nfs_fh *fh;
  	const struct qstr *name;
  	struct page *page;
  	const u32 *bitmask;
  	clientid4 clientid;
  	unsigned char migration:1, renew:1;
  };
  
  struct nfs4_fs_locations_res {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs4_fs_locations       *fs_locations;
  	unsigned char			migration:1, renew:1;
  };
  
  struct nfs4_secinfo4 {
  	u32			flavor;
  	struct rpcsec_gss_info	flavor_info;
  };
  
  struct nfs4_secinfo_flavors {
  	unsigned int		num_flavors;
  	struct nfs4_secinfo4	flavors[0];
  };
  
  struct nfs4_secinfo_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh		*dir_fh;
  	const struct qstr		*name;
  };
  
  struct nfs4_secinfo_res {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs4_secinfo_flavors	*flavors;
  };
  
  struct nfs4_fsid_present_arg {
  	struct nfs4_sequence_args	seq_args;
  	const struct nfs_fh		*fh;
  	clientid4			clientid;
  	unsigned char			renew:1;
  };
  
  struct nfs4_fsid_present_res {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs_fh			*fh;
  	unsigned char			renew:1;
  };
  
  #endif /* CONFIG_NFS_V4 */
  
  struct nfstime4 {
  	u64	seconds;
  	u32	nseconds;
  };
  
  #ifdef CONFIG_NFS_V4_1
  
  struct pnfs_commit_bucket {
  	struct list_head written;
  	struct list_head committing;
  	struct pnfs_layout_segment *wlseg;
  	struct pnfs_layout_segment *clseg;
  	struct nfs_writeverf direct_verf;
  };
  
  struct pnfs_ds_commit_info {
  	int nwritten;
  	int ncommitting;
  	int nbuckets;
  	struct pnfs_commit_bucket *buckets;
  };
  
  struct nfs41_state_protection {
  	u32 how;
  	struct nfs4_op_map enforce;
  	struct nfs4_op_map allow;
  };
  
  struct nfs41_exchange_id_args {
  	struct nfs_client		*client;
  	nfs4_verifier			verifier;
  	u32				flags;
  	struct nfs41_state_protection	state_protect;
  };
  
  struct nfs41_server_owner {
  	uint64_t			minor_id;
  	uint32_t			major_id_sz;
  	char				major_id[NFS4_OPAQUE_LIMIT];
  };
  
  struct nfs41_server_scope {
  	uint32_t			server_scope_sz;
  	char 				server_scope[NFS4_OPAQUE_LIMIT];
  };
  
  struct nfs41_impl_id {
  	char				domain[NFS4_OPAQUE_LIMIT + 1];
  	char				name[NFS4_OPAQUE_LIMIT + 1];
  	struct nfstime4			date;
  };
  
  struct nfs41_bind_conn_to_session_args {
  	struct nfs_client		*client;
  	struct nfs4_sessionid		sessionid;
  	u32				dir;
  	bool				use_conn_in_rdma_mode;
  };
  
  struct nfs41_bind_conn_to_session_res {
  	struct nfs4_sessionid		sessionid;
  	u32				dir;
  	bool				use_conn_in_rdma_mode;
  };
  
  struct nfs41_exchange_id_res {
  	u64				clientid;
  	u32				seqid;
  	u32				flags;
  	struct nfs41_server_owner	*server_owner;
  	struct nfs41_server_scope	*server_scope;
  	struct nfs41_impl_id		*impl_id;
  	struct nfs41_state_protection	state_protect;
  };
  
  struct nfs41_create_session_args {
  	struct nfs_client	       *client;
  	u64				clientid;
  	uint32_t			seqid;
  	uint32_t			flags;
  	uint32_t			cb_program;
  	struct nfs4_channel_attrs	fc_attrs;	/* Fore Channel */
  	struct nfs4_channel_attrs	bc_attrs;	/* Back Channel */
  };
  
  struct nfs41_create_session_res {
  	struct nfs4_sessionid		sessionid;
  	uint32_t			seqid;
  	uint32_t			flags;
  	struct nfs4_channel_attrs	fc_attrs;	/* Fore Channel */
  	struct nfs4_channel_attrs	bc_attrs;	/* Back Channel */
  };
  
  struct nfs41_reclaim_complete_args {
  	struct nfs4_sequence_args	seq_args;
  	/* In the future extend to include curr_fh for use with migration */
  	unsigned char			one_fs:1;
  };
  
  struct nfs41_reclaim_complete_res {
  	struct nfs4_sequence_res	seq_res;
  };
  
  #define SECINFO_STYLE_CURRENT_FH 0
  #define SECINFO_STYLE_PARENT 1
  struct nfs41_secinfo_no_name_args {
  	struct nfs4_sequence_args	seq_args;
  	int				style;
  };
  
  struct nfs41_test_stateid_args {
  	struct nfs4_sequence_args	seq_args;
  	nfs4_stateid			*stateid;
  };
  
  struct nfs41_test_stateid_res {
  	struct nfs4_sequence_res	seq_res;
  	unsigned int			status;
  };
  
  struct nfs41_free_stateid_args {
  	struct nfs4_sequence_args	seq_args;
  	nfs4_stateid			stateid;
  };
  
  struct nfs41_free_stateid_res {
  	struct nfs4_sequence_res	seq_res;
  	unsigned int			status;
  };
  
  static inline void
  nfs_free_pnfs_ds_cinfo(struct pnfs_ds_commit_info *cinfo)
  {
  	kfree(cinfo->buckets);
  }
  
  #else
  
  struct pnfs_ds_commit_info {
  };
  
  static inline void
  nfs_free_pnfs_ds_cinfo(struct pnfs_ds_commit_info *cinfo)
  {
  }
  
  #endif /* CONFIG_NFS_V4_1 */
  
  #ifdef CONFIG_NFS_V4_2
  struct nfs42_falloc_args {
  	struct nfs4_sequence_args	seq_args;
  
  	struct nfs_fh			*falloc_fh;
  	nfs4_stateid			 falloc_stateid;
  	u64				 falloc_offset;
  	u64				 falloc_length;
  	const u32			*falloc_bitmask;
  };
  
  struct nfs42_falloc_res {
  	struct nfs4_sequence_res	seq_res;
  	unsigned int			status;
  
  	struct nfs_fattr		*falloc_fattr;
  	const struct nfs_server		*falloc_server;
  };
  
  struct nfs42_copy_args {
  	struct nfs4_sequence_args	seq_args;
  
  	struct nfs_fh			*src_fh;
  	nfs4_stateid			src_stateid;
  	u64				src_pos;
  
  	struct nfs_fh			*dst_fh;
  	nfs4_stateid			dst_stateid;
  	u64				dst_pos;
  
  	u64				count;
  };
  
  struct nfs42_write_res {
  	u64			count;
  	struct nfs_writeverf	verifier;
  };
  
  struct nfs42_copy_res {
  	struct nfs4_sequence_res	seq_res;
  	struct nfs42_write_res		write_res;
  	bool				consecutive;
  	bool				synchronous;
  	struct nfs_commitres		commit_res;
  };
  
  struct nfs42_seek_args {
  	struct nfs4_sequence_args	seq_args;
  
  	struct nfs_fh			*sa_fh;
  	nfs4_stateid			sa_stateid;
  	u64				sa_offset;
  	u32				sa_what;
  };
  
  struct nfs42_seek_res {
  	struct nfs4_sequence_res	seq_res;
  	unsigned int			status;
  
  	u32	sr_eof;
  	u64	sr_offset;
  };
  #endif
  
  struct nfs_page;
  
  #define NFS_PAGEVEC_SIZE	(8U)
  
  struct nfs_page_array {
  	struct page		**pagevec;
  	unsigned int		npages;		/* Max length of pagevec */
  	struct page		*page_array[NFS_PAGEVEC_SIZE];
  };
  
  /* used as flag bits in nfs_pgio_header */
  enum {
  	NFS_IOHDR_ERROR = 0,
  	NFS_IOHDR_EOF,
  	NFS_IOHDR_REDO,
  	NFS_IOHDR_STAT,
  };
  
  struct nfs_io_completion;
  struct nfs_pgio_header {
  	struct inode		*inode;
  	struct rpc_cred		*cred;
  	struct list_head	pages;
  	struct nfs_page		*req;
  	struct nfs_writeverf	verf;		/* Used for writes */
  	fmode_t			rw_mode;
  	struct pnfs_layout_segment *lseg;
  	loff_t			io_start;
  	const struct rpc_call_ops *mds_ops;
  	void (*release) (struct nfs_pgio_header *hdr);
  	const struct nfs_pgio_completion_ops *completion_ops;
  	const struct nfs_rw_ops	*rw_ops;
  	struct nfs_io_completion *io_completion;
  	struct nfs_direct_req	*dreq;
  	spinlock_t		lock;
  	/* fields protected by lock */
  	int			pnfs_error;
  	int			error;		/* merge with pnfs_error */
  	unsigned long		good_bytes;	/* boundary of good data */
  	unsigned long		flags;
  
  	/*
  	 * rpc data
  	 */
  	struct rpc_task		task;
  	struct nfs_fattr	fattr;
  	struct nfs_pgio_args	args;		/* argument struct */
  	struct nfs_pgio_res	res;		/* result struct */
  	unsigned long		timestamp;	/* For lease renewal */
  	int (*pgio_done_cb)(struct rpc_task *, struct nfs_pgio_header *);
  	__u64			mds_offset;	/* Filelayout dense stripe */
  	struct nfs_page_array	page_array;
  	struct nfs_client	*ds_clp;	/* pNFS data server */
  	int			ds_commit_idx;	/* ds index if ds_clp is set */
  	int			pgio_mirror_idx;/* mirror index in pgio layer */
  };
  
  struct nfs_mds_commit_info {
  	atomic_t rpcs_out;
  	atomic_long_t		ncommit;
  	struct list_head	list;
  };
  
  struct nfs_commit_info;
  struct nfs_commit_data;
  struct nfs_inode;
  struct nfs_commit_completion_ops {
  	void (*completion) (struct nfs_commit_data *data);
  	void (*resched_write) (struct nfs_commit_info *, struct nfs_page *);
  };
  
  struct nfs_commit_info {
  	struct inode 			*inode;	/* Needed for inode->i_lock */
  	struct nfs_mds_commit_info	*mds;
  	struct pnfs_ds_commit_info	*ds;
  	struct nfs_direct_req		*dreq;	/* O_DIRECT request */
  	const struct nfs_commit_completion_ops *completion_ops;
  };
  
  struct nfs_commit_data {
  	struct rpc_task		task;
  	struct inode		*inode;
  	struct rpc_cred		*cred;
  	struct nfs_fattr	fattr;
  	struct nfs_writeverf	verf;
  	struct list_head	pages;		/* Coalesced requests we wish to flush */
  	struct list_head	list;		/* lists of struct nfs_write_data */
  	struct nfs_direct_req	*dreq;		/* O_DIRECT request */
  	struct nfs_commitargs	args;		/* argument struct */
  	struct nfs_commitres	res;		/* result struct */
  	struct nfs_open_context *context;
  	struct pnfs_layout_segment *lseg;
  	struct nfs_client	*ds_clp;	/* pNFS data server */
  	int			ds_commit_index;
  	loff_t			lwb;
  	const struct rpc_call_ops *mds_ops;
  	const struct nfs_commit_completion_ops *completion_ops;
  	int (*commit_done_cb) (struct rpc_task *task, struct nfs_commit_data *data);
  	unsigned long		flags;
  };
  
  struct nfs_pgio_completion_ops {
  	void	(*error_cleanup)(struct list_head *head);
  	void	(*init_hdr)(struct nfs_pgio_header *hdr);
  	void	(*completion)(struct nfs_pgio_header *hdr);
  	void	(*reschedule_io)(struct nfs_pgio_header *hdr);
  };
  
  struct nfs_unlinkdata {
  	struct nfs_removeargs args;
  	struct nfs_removeres res;
  	struct dentry *dentry;
  	wait_queue_head_t wq;
  	struct rpc_cred	*cred;
  	struct nfs_fattr dir_attr;
  	long timeout;
  };
  
  struct nfs_renamedata {
  	struct nfs_renameargs	args;
  	struct nfs_renameres	res;
  	struct rpc_cred		*cred;
  	struct inode		*old_dir;
  	struct dentry		*old_dentry;
  	struct nfs_fattr	old_fattr;
  	struct inode		*new_dir;
  	struct dentry		*new_dentry;
  	struct nfs_fattr	new_fattr;
  	void (*complete)(struct rpc_task *, struct nfs_renamedata *);
  	long timeout;
  	bool cancelled;
  };
  
  struct nfs_access_entry;
  struct nfs_client;
  struct rpc_timeout;
  struct nfs_subversion;
  struct nfs_mount_info;
  struct nfs_client_initdata;
  struct nfs_pageio_descriptor;
  
  /*
   * RPC procedure vector for NFSv2/NFSv3 demuxing
   */
  struct nfs_rpc_ops {
  	u32	version;		/* Protocol version */
  	const struct dentry_operations *dentry_ops;
  	const struct inode_operations *dir_inode_ops;
  	const struct inode_operations *file_inode_ops;
  	const struct file_operations *file_ops;
  	const struct nlmclnt_operations *nlmclnt_ops;
  
  	int	(*getroot) (struct nfs_server *, struct nfs_fh *,
  			    struct nfs_fsinfo *);
  	struct vfsmount *(*submount) (struct nfs_server *, struct dentry *,
  				      struct nfs_fh *, struct nfs_fattr *);
  	struct dentry *(*try_mount) (int, const char *, struct nfs_mount_info *,
  				     struct nfs_subversion *);
  	int	(*getattr) (struct nfs_server *, struct nfs_fh *,
  			    struct nfs_fattr *, struct nfs4_label *);
  	int	(*setattr) (struct dentry *, struct nfs_fattr *,
  			    struct iattr *);
  	int	(*lookup)  (struct inode *, const struct qstr *,
  			    struct nfs_fh *, struct nfs_fattr *,
  			    struct nfs4_label *);
  	int	(*lookupp) (struct inode *, struct nfs_fh *,
  			    struct nfs_fattr *, struct nfs4_label *);
  	int	(*access)  (struct inode *, struct nfs_access_entry *);
  	int	(*readlink)(struct inode *, struct page *, unsigned int,
  			    unsigned int);
  	int	(*create)  (struct inode *, struct dentry *,
  			    struct iattr *, int);
  	int	(*remove)  (struct inode *, const struct qstr *);
  	void	(*unlink_setup)  (struct rpc_message *, struct inode *dir);
  	void	(*unlink_rpc_prepare) (struct rpc_task *, struct nfs_unlinkdata *);
  	int	(*unlink_done) (struct rpc_task *, struct inode *);
  	void	(*rename_setup)  (struct rpc_message *msg, struct inode *dir);
  	void	(*rename_rpc_prepare)(struct rpc_task *task, struct nfs_renamedata *);
  	int	(*rename_done) (struct rpc_task *task, struct inode *old_dir, struct inode *new_dir);
  	int	(*link)    (struct inode *, struct inode *, const struct qstr *);
  	int	(*symlink) (struct inode *, struct dentry *, struct page *,
  			    unsigned int, struct iattr *);
  	int	(*mkdir)   (struct inode *, struct dentry *, struct iattr *);
  	int	(*rmdir)   (struct inode *, const struct qstr *);
  	int	(*readdir) (struct dentry *, struct rpc_cred *,
  			    u64, struct page **, unsigned int, bool);
  	int	(*mknod)   (struct inode *, struct dentry *, struct iattr *,
  			    dev_t);
  	int	(*statfs)  (struct nfs_server *, struct nfs_fh *,
  			    struct nfs_fsstat *);
  	int	(*fsinfo)  (struct nfs_server *, struct nfs_fh *,
  			    struct nfs_fsinfo *);
  	int	(*pathconf) (struct nfs_server *, struct nfs_fh *,
  			     struct nfs_pathconf *);
  	int	(*set_capabilities)(struct nfs_server *, struct nfs_fh *);
  	int	(*decode_dirent)(struct xdr_stream *, struct nfs_entry *, bool);
  	int	(*pgio_rpc_prepare)(struct rpc_task *,
  				    struct nfs_pgio_header *);
  	void	(*read_setup)(struct nfs_pgio_header *, struct rpc_message *);
  	int	(*read_done)(struct rpc_task *, struct nfs_pgio_header *);
  	void	(*write_setup)(struct nfs_pgio_header *, struct rpc_message *);
  	int	(*write_done)(struct rpc_task *, struct nfs_pgio_header *);
  	void	(*commit_setup) (struct nfs_commit_data *, struct rpc_message *);
  	void	(*commit_rpc_prepare)(struct rpc_task *, struct nfs_commit_data *);
  	int	(*commit_done) (struct rpc_task *, struct nfs_commit_data *);
  	int	(*lock)(struct file *, int, struct file_lock *);
  	int	(*lock_check_bounds)(const struct file_lock *);
  	void	(*clear_acl_cache)(struct inode *);
  	void	(*close_context)(struct nfs_open_context *ctx, int);
  	struct inode * (*open_context) (struct inode *dir,
  				struct nfs_open_context *ctx,
  				int open_flags,
  				struct iattr *iattr,
  				int *);
  	int (*have_delegation)(struct inode *, fmode_t);
  	int (*return_delegation)(struct inode *);
  	struct nfs_client *(*alloc_client) (const struct nfs_client_initdata *);
  	struct nfs_client *(*init_client) (struct nfs_client *,
  				const struct nfs_client_initdata *);
  	void	(*free_client) (struct nfs_client *);
  	struct nfs_server *(*create_server)(struct nfs_mount_info *, struct nfs_subversion *);
  	struct nfs_server *(*clone_server)(struct nfs_server *, struct nfs_fh *,
  					   struct nfs_fattr *, rpc_authflavor_t);
  };
  
  /*
   * 	NFS_CALL(getattr, inode, (fattr));
   * into
   *	NFS_PROTO(inode)->getattr(fattr);
   */
  #define NFS_CALL(op, inode, args)	NFS_PROTO(inode)->op args
  
  /*
   * Function vectors etc. for the NFS client
   */
  extern const struct nfs_rpc_ops	nfs_v2_clientops;
  extern const struct nfs_rpc_ops	nfs_v3_clientops;
  extern const struct nfs_rpc_ops	nfs_v4_clientops;
  extern const struct rpc_version nfs_version2;
  extern const struct rpc_version nfs_version3;
  extern const struct rpc_version nfs_version4;
  
  extern const struct rpc_version nfsacl_version3;
  extern const struct rpc_program nfsacl_program;
  
  #endif
  