/* 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)

#define NFS_BITMASK_SZ          3

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 {
        __u64                   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 timespec64       atime;
        struct timespec64       mtime;
        struct timespec64       ctime;
        struct timespec64       btime;
        __u64                   change_attr;    /* NFSv4 change attribute */
        __u64                   pre_change_attr;/* pre-op NFSv4 change attribute */
        __u64                   pre_size;       /* pre_op_attr.size       */
        struct timespec64       pre_mtime;      /* pre_op_attr.mtime      */
        struct timespec64       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 */
        struct nfs4_label       *label;
};

#define NFS_ATTR_FATTR_TYPE             BIT_ULL(0)
#define NFS_ATTR_FATTR_MODE             BIT_ULL(1)
#define NFS_ATTR_FATTR_NLINK            BIT_ULL(2)
#define NFS_ATTR_FATTR_OWNER            BIT_ULL(3)
#define NFS_ATTR_FATTR_GROUP            BIT_ULL(4)
#define NFS_ATTR_FATTR_RDEV             BIT_ULL(5)
#define NFS_ATTR_FATTR_SIZE             BIT_ULL(6)
#define NFS_ATTR_FATTR_PRESIZE          BIT_ULL(7)
#define NFS_ATTR_FATTR_BLOCKS_USED      BIT_ULL(8)
#define NFS_ATTR_FATTR_SPACE_USED       BIT_ULL(9)
#define NFS_ATTR_FATTR_FSID             BIT_ULL(10)
#define NFS_ATTR_FATTR_FILEID           BIT_ULL(11)
#define NFS_ATTR_FATTR_ATIME            BIT_ULL(12)
#define NFS_ATTR_FATTR_MTIME            BIT_ULL(13)
#define NFS_ATTR_FATTR_CTIME            BIT_ULL(14)
#define NFS_ATTR_FATTR_PREMTIME         BIT_ULL(15)
#define NFS_ATTR_FATTR_PRECTIME         BIT_ULL(16)
#define NFS_ATTR_FATTR_CHANGE           BIT_ULL(17)
#define NFS_ATTR_FATTR_PRECHANGE        BIT_ULL(18)
#define NFS_ATTR_FATTR_V4_LOCATIONS     BIT_ULL(19)
#define NFS_ATTR_FATTR_V4_REFERRAL      BIT_ULL(20)
#define NFS_ATTR_FATTR_MOUNTPOINT       BIT_ULL(21)
#define NFS_ATTR_FATTR_MOUNTED_ON_FILEID BIT_ULL(22)
#define NFS_ATTR_FATTR_OWNER_NAME       BIT_ULL(23)
#define NFS_ATTR_FATTR_GROUP_NAME       BIT_ULL(24)
#define NFS_ATTR_FATTR_V4_SECURITY_LABEL BIT_ULL(25)
#define NFS_ATTR_FATTR_BTIME            BIT_ULL(26)

#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_BTIME \
                | 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 timespec64       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 */
        enum nfs4_change_attr_type
                                change_attr_type; /* Info about change attr */
        __u32                   xattr_support; /* User xattrs supported */
};

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 {
        const struct nfs4_sequence_slot_ops *sr_slot_ops;
        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;
        int status;
        __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;
        const struct cred *cred;
        struct pnfs_layout_hdr *lo;
        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;
        const struct 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;
        const struct 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_device_error {
        struct nfs4_deviceid dev_id;
        int status;
        enum nfs_opnum4 opnum;
};

struct nfs42_layout_error {
        __u64 offset;
        __u64 length;
        nfs4_stateid stateid;
        struct nfs42_device_error errors[1];
};

#define NFS42_LAYOUTERROR_MAX 5

struct nfs42_layouterror_args {
        struct nfs4_sequence_args seq_args;
        struct inode *inode;
        unsigned int num_errors;
        struct nfs42_layout_error errors[NFS42_LAYOUTERROR_MAX];
};

struct nfs42_layouterror_res {
        struct nfs4_sequence_res seq_res;
        unsigned int num_errors;
        int rpc_status;
};

struct nfs42_layouterror_data {
        struct nfs42_layouterror_args args;
        struct nfs42_layouterror_res res;
        struct inode *inode;
        struct pnfs_layout_segment *lseg;
};

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;
        __u64   uniquifier;
};

struct nfs4_open_delegation {
        __u32 open_delegation_type;
        union {
                struct {
                        fmode_t                 type;
                        __u32                   do_recall;
                        nfs4_stateid            stateid;
                        unsigned long           pagemod_limit;
                };
                struct {
                        __u32                   why_no_delegation;
                        __u32                   will_notify;
                };
        };
};

/*
 * 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 */
                __u32           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 nfs4_layoutget_args *lg_args;
};

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 nfs_seqid *      seqid;
        const struct nfs_server *server;
        __u32                   attrset[NFS4_BITMAP_SIZE];
        struct nfs4_string      *owner;
        struct nfs4_string      *group_owner;
        struct nfs4_open_delegation     delegation;
        __u32                   access_request;
        __u32                   access_supported;
        __u32                   access_result;
        struct nfs4_layoutget_res *lg_res;
};

/*
 * 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;
        u32                     bitmask_store[NFS_BITMASK_SZ];
        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_delegattr {
        struct timespec64       atime;
        struct timespec64       mtime;
        bool                    atime_set;
        bool                    mtime_set;
};

struct nfs4_delegreturnargs {
        struct nfs4_sequence_args       seq_args;
        const struct nfs_fh *fhandle;
        const nfs4_stateid *stateid;
        const u32 *bitmask;
        u32 bitmask_store[NFS_BITMASK_SZ];
        struct nfs4_layoutreturn_args *lr_args;
        struct nfs4_delegattr *sattr_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;
        bool sattr_res;
        int sattr_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;
        union {
                unsigned int            replen;                 /* used by read */
                struct {
                        const u32 *             bitmask;        /* used by write */
                        u32 bitmask_store[NFS_BITMASK_SZ];      /* 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;
        __u64                   count;
        __u32                   op_status;
        union {
                struct {
                        unsigned int            replen;         /* used by read */
                        int                     eof;            /* used by read */
                        void *                  scratch;        /* used by read */
                };
                struct {
                        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;
        const char *            name;
        unsigned int            len;
        int                     eof;
        struct nfs_fh *         fh;
        struct nfs_fattr *      fattr;
        unsigned char           d_type;
        struct nfs_server *     server;
};

struct nfs_readdir_arg {
        struct dentry           *dentry;
        const struct cred       *cred;
        __be32                  *verf;
        u64                     cookie;
        struct page             **pages;
        unsigned int            page_len;
        bool                    plus;
};

struct nfs_readdir_res {
        __be32                  *verf;
};

/*
 * 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;
};

enum nfs4_acl_type {
        NFS4ACL_NONE = 0,
        NFS4ACL_ACL,
        NFS4ACL_DACL,
        NFS4ACL_SACL,
};

struct nfs_setaclargs {
        struct nfs4_sequence_args       seq_args;
        struct nfs_fh *                 fh;
        enum nfs4_acl_type              acl_type;
        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;
        enum nfs4_acl_type              acl_type;
        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;
        enum nfs4_acl_type              acl_type;
        size_t                          acl_len;
        size_t                          acl_data_offset;
        int                             acl_flags;
        struct folio *                  acl_scratch;
};

struct nfs_setattrres {
        struct nfs4_sequence_res        seq_res;
        struct nfs_fattr *              fattr;
        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 timespec64       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_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;
        bool                            get_dir_deleg;
};

struct nfs4_gdd_res {
        u32                             status;
        nfs4_stateid                    deleg;
};

struct nfs4_getattr_res {
        struct nfs4_sequence_res        seq_res;
        const struct nfs_server *       server;
        struct nfs_fattr *              fattr;
        struct nfs4_gdd_res *           gdd_res;
};

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_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_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_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_open_caps {
        u32                             oa_share_access[1];
        u32                             oa_share_deny[1];
        u32                             oa_share_access_want[1];
        u32                             oa_open_claim[1];
        u32                             oa_createmode[1];
};

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;
        u32                             case_insensitive;
        u32                             case_preserving;
        struct nfs4_open_caps           open_caps;
};

#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[];
};

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;
};

struct pnfs_commit_bucket {
        struct list_head written;
        struct list_head committing;
        struct pnfs_layout_segment *lseg;
        struct nfs_writeverf direct_verf;
};

struct pnfs_commit_array {
        struct list_head cinfo_list;
        struct list_head lseg_list;
        struct pnfs_layout_segment *lseg;
        struct rcu_head rcu;
        refcount_t refcount;
        unsigned int nbuckets;
        struct pnfs_commit_bucket buckets[] __counted_by(nbuckets);
};

struct pnfs_ds_commit_info {
        struct list_head commits;
        unsigned int nwritten;
        unsigned int ncommitting;
        const struct pnfs_commit_ops *ops;
};

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;
};

#define MAX_BIND_CONN_TO_SESSION_RETRIES 3
struct nfs41_bind_conn_to_session_args {
        struct nfs_client               *client;
        struct nfs4_sessionid           sessionid;
        u32                             dir;
        bool                            use_conn_in_rdma_mode;
        int                             retries;
};

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;
};

#else

struct pnfs_ds_commit_info {
};

#endif /* CONFIG_NFS_V4 */

#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;
        bool                            sync;
        struct nl4_server               *cp_src;
};

struct nfs42_write_res {
        nfs4_stateid            stateid;
        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_offload_status_args {
        struct nfs4_sequence_args       osa_seq_args;
        struct nfs_fh                   *osa_src_fh;
        nfs4_stateid                    osa_stateid;
};

struct nfs42_offload_status_res {
        struct nfs4_sequence_res        osr_seq_res;
        u64                             osr_count;
        int                             complete_count;
        u32                             osr_complete;
};

struct nfs42_copy_notify_args {
        struct nfs4_sequence_args       cna_seq_args;

        struct nfs_fh           *cna_src_fh;
        nfs4_stateid            cna_src_stateid;
        struct nl4_server       cna_dst;
};

struct nfs42_copy_notify_res {
        struct nfs4_sequence_res        cnr_seq_res;

        struct nfstime4         cnr_lease_time;
        nfs4_stateid            cnr_stateid;
        struct nl4_server       cnr_src;
};

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;
};

struct nfs42_setxattrargs {
        struct nfs4_sequence_args       seq_args;
        struct nfs_fh                   *fh;
        const u32                       *bitmask;
        const char                      *xattr_name;
        u32                             xattr_flags;
        size_t                          xattr_len;
        struct page                     **xattr_pages;
};

struct nfs42_setxattrres {
        struct nfs4_sequence_res        seq_res;
        struct nfs4_change_info         cinfo;
        struct nfs_fattr                *fattr;
        const struct nfs_server         *server;
};

struct nfs42_getxattrargs {
        struct nfs4_sequence_args       seq_args;
        struct nfs_fh                   *fh;
        const char                      *xattr_name;
        size_t                          xattr_len;
        struct page                     **xattr_pages;
};

struct nfs42_getxattrres {
        struct nfs4_sequence_res        seq_res;
        size_t                          xattr_len;
};

struct nfs42_listxattrsargs {
        struct nfs4_sequence_args       seq_args;
        struct nfs_fh                   *fh;
        u32                             count;
        u64                             cookie;
        struct page                     **xattr_pages;
};

struct nfs42_listxattrsres {
        struct nfs4_sequence_res        seq_res;
        struct folio                    *scratch;
        void                            *xattr_buf;
        size_t                          xattr_len;
        u64                             cookie;
        bool                            eof;
        size_t                          copied;
};

struct nfs42_removexattrargs {
        struct nfs4_sequence_args       seq_args;
        struct nfs_fh                   *fh;
        const char                      *xattr_name;
};

struct nfs42_removexattrres {
        struct nfs4_sequence_res        seq_res;
        struct nfs4_change_info         cinfo;
};

#endif /* CONFIG_NFS_V4_2 */

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,
        NFS_IOHDR_RESEND_PNFS,
        NFS_IOHDR_RESEND_MDS,
        NFS_IOHDR_UNSTABLE_WRITES,
        NFS_IOHDR_ODIRECT,
};

struct nfs_io_completion;
struct nfs_pgio_header {
        struct inode            *inode;
        const struct 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;
#ifdef CONFIG_NFS_FSCACHE
        void                    *netfs;
#endif

        unsigned short          retrans;
        int                     pnfs_error;
        int                     error;          /* merge with pnfs_error */
        unsigned int            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 */
        u32                     ds_commit_idx;  /* ds index if ds_clp is set */
        u32                     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;
        const struct 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, int);
        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;
        const struct cred *cred;
        struct nfs_fattr dir_attr;
        long timeout;
};

struct nfs_renamedata {
        struct nfs_renameargs   args;
        struct nfs_renameres    res;
        struct rpc_task         task;
        const struct 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;
struct fs_context;

/*
 * 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 *);
        int     (*submount) (struct fs_context *, struct nfs_server *);
        int     (*try_get_tree) (struct fs_context *);
        int     (*getattr) (struct nfs_server *, struct nfs_fh *,
                            struct nfs_fattr *, struct inode *);
        int     (*setattr) (struct dentry *, struct nfs_fattr *,
                            struct iattr *);
        int     (*lookup)  (struct inode *, struct dentry *, const struct qstr *,
                            struct nfs_fh *, struct nfs_fattr *);
        int     (*lookupp) (struct inode *, struct nfs_fh *,
                            struct nfs_fattr *);
        int     (*access)  (struct inode *, struct nfs_access_entry *, const struct cred *);
        int     (*readlink)(struct inode *, struct page *, unsigned int,
                            unsigned int);
        int     (*create)  (struct inode *, struct dentry *,
                            struct iattr *, int);
        int     (*remove)  (struct inode *, struct dentry *);
        void    (*unlink_setup)  (struct rpc_message *, struct dentry *, struct inode *);
        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 dentry *old_dentry,
                        struct dentry *new_dentry,
                        struct inode *same_parent);
        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 folio *,
                            unsigned int, struct iattr *);
        struct dentry *(*mkdir)   (struct inode *, struct dentry *, struct iattr *);
        int     (*rmdir)   (struct inode *, const struct qstr *);
        int     (*readdir) (struct nfs_readdir_arg *, struct nfs_readdir_res *);
        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 *,
                                struct rpc_clnt **);
        int     (*write_done)(struct rpc_task *, struct nfs_pgio_header *);
        void    (*commit_setup) (struct nfs_commit_data *, struct rpc_message *,
                                struct rpc_clnt **);
        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);
        void (*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 fs_context *);
        struct nfs_server *(*clone_server)(struct nfs_server *, struct nfs_fh *,
                                           struct nfs_fattr *, rpc_authflavor_t);
        int     (*discover_trunking)(struct nfs_server *, struct nfs_fh *);
        void    (*enable_swap)(struct inode *inode);
        void    (*disable_swap)(struct inode *inode);
};

/*
 * Helper functions used by NFS client and/or server
 */
static inline void encode_opaque_fixed(struct xdr_stream *xdr,
                                       const void *buf, size_t len)
{
        WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
}

static inline int decode_opaque_fixed(struct xdr_stream *xdr,
                                      void *buf, size_t len)
{
        ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
        if (unlikely(ret < 0))
                return -EIO;
        return 0;
}

/*
 * 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 /* _LINUX_NFS_XDR_H */