/*
 * Copyright (c) 2000-2018 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1989, 1993, 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)nfs.h	8.4 (Berkeley) 5/1/95
 * FreeBSD-Id: nfs.h,v 1.32 1997/10/12 20:25:38 phk Exp $
 */

#ifndef _NFS_NFS_H_
#define _NFS_NFS_H_

#include <sys/appleapiopts.h>
#include <sys/cdefs.h>

#ifdef __APPLE_API_PRIVATE
/*
 * Tunable constants for nfs
 */

#define NFS_TICKINTVL   5               /* Desired time for a tick (msec) */
#define NFS_HZ          (hz / nfs_ticks) /* Ticks/sec */
extern int nfs_ticks;
#define NFS_TIMEO       (1 * NFS_HZ)    /* Default timeout = 1 second */
#define NFS_MINTIMEO    (1 * NFS_HZ)    /* Min timeout to use */
#define NFS_MAXTIMEO    (60 * NFS_HZ)   /* Max timeout to backoff to */
#define NFS_MINIDEMTIMEO (5 * NFS_HZ)   /* Min timeout for non-idempotent ops*/
#define NFS_MAXREXMIT   100             /* Stop counting after this many */
#define NFS_RETRANS     10              /* Num of retrans for soft mounts */
#define NFS_TRYLATERDEL 4               /* Initial try later delay (sec) */
#define NFS_MAXGRPS     16U             /* Max. size of groups list */
#define NFS_MINATTRTIMO 5               /* Attribute cache timeout in sec */
#define NFS_MAXATTRTIMO 60
#define NFS_MINDIRATTRTIMO 5            /* directory attribute cache timeout in sec */
#define NFS_MAXDIRATTRTIMO 60
#define NFS_MAXPORT     0xffff
#define NFS_IOSIZE      (1024 * 1024)   /* suggested I/O size */
#define NFS_RWSIZE      32768           /* Def. read/write data size <= 32K */
#define NFS_WSIZE       NFS_RWSIZE      /* Def. write data size <= 32K */
#define NFS_RSIZE       NFS_RWSIZE      /* Def. read data size <= 32K */
#define NFS_DGRAM_WSIZE 8192            /* UDP Def. write data size <= 8K */
#define NFS_DGRAM_RSIZE 8192            /* UDP Def. read data size <= 8K */
#define NFS_READDIRSIZE 32768           /* Def. readdir size */
#define NFS_DEFRAHEAD   16              /* Def. read ahead # blocks */
#define NFS_MAXRAHEAD   128             /* Max. read ahead # blocks */
#define NFS_DEFMAXASYNCWRITES   128     /* Def. max # concurrent async write RPCs */
#define NFS_DEFASYNCTHREAD      16      /* Def. # nfsiod threads */
#define NFS_MAXASYNCTHREAD      64      /* max # nfsiod threads */
#define NFS_ASYNCTHREADMAXIDLE  60      /* Seconds before idle nfsiods are reaped */
#define NFS_DEFSTATFSRATELIMIT  10      /* Def. max # statfs RPCs per second */
#define NFS_REQUESTDELAY        10      /* ms interval to check request queue */
#define NFSRV_MAXWGATHERDELAY   100     /* Max. write gather delay (msec) */
#ifndef NFSRV_WGATHERDELAY
#define NFSRV_WGATHERDELAY      1       /* Default write gather delay (msec) */
#endif
#define NFS_DIRBLKSIZ   4096            /* size of NFS directory buffers */
#if defined(KERNEL) && !defined(DIRBLKSIZ)
#define DIRBLKSIZ       512             /* XXX we used to use ufs's DIRBLKSIZ */
                                        /* can't be larger than NFS_FABLKSIZE */
#endif

/* default values for unresponsive mount timeouts */
#define NFS_TPRINTF_INITIAL_DELAY       5
#define NFS_TPRINTF_DELAY               30

/*
 * Oddballs
 */
#define NFS_CMPFH(n, f, s) \
	((n)->n_fhsize == (s) && !bcmp((caddr_t)(n)->n_fhp, (caddr_t)(f), (s)))
#define NFSRV_NDMAXDATA(n) \
	        (((n)->nd_vers == NFS_VER3) ? (((n)->nd_nam2) ? \
	         NFS_MAXDGRAMDATA : NFSRV_MAXDATA) : NFS_V2MAXDATA)
#define NFS_PORT_INVALID(port) \
	(((port) > NFS_MAXPORT) || ((port) < 0))

/*
 * The IO_METASYNC flag should be implemented for local file systems.
 * (Until then, it is nothin at all.)
 */
#ifndef IO_METASYNC
#define IO_METASYNC     0
#endif

/*
 * Expected allocation sizes for major data structures. If the actual size
 * of the structure exceeds these sizes, then malloc() will be allocating
 * almost twice the memory required. This is used in nfs_init() to warn
 * the sysadmin that the size of a structure should be reduced.
 * (These sizes are always a power of 2. If the kernel malloc() changes
 *  to one that does not allocate space in powers of 2 size, then this all
 *  becomes bunk!).
 * Note that some of these structures come out of their own nfs zones.
 */
#define NFS_NODEALLOC   1024
#define NFS_MNTALLOC    1024
#define NFS_SVCALLOC    512

#define NFS_ARGSVERSION_XDR     88      /* NFS mount args are in XDR format */

#define NFS_XDRARGS_VERSION_0   0
#define NFS_MATTR_BITMAP_LEN    1               /* length of mount attributes bitmap */
#define NFS_MFLAG_BITMAP_LEN    1               /* length of mount flags bitmap */

/* NFS mount attributes */
#define NFS_MATTR_FLAGS                 0       /* mount flags (NFS_MATTR_*) */
#define NFS_MATTR_NFS_VERSION           1       /* NFS protocol version */
#define NFS_MATTR_NFS_MINOR_VERSION     2       /* NFS protocol minor version */
#define NFS_MATTR_READ_SIZE             3       /* READ RPC size */
#define NFS_MATTR_WRITE_SIZE            4       /* WRITE RPC size */
#define NFS_MATTR_READDIR_SIZE          5       /* READDIR RPC size */
#define NFS_MATTR_READAHEAD             6       /* block readahead count */
#define NFS_MATTR_ATTRCACHE_REG_MIN     7       /* minimum attribute cache time */
#define NFS_MATTR_ATTRCACHE_REG_MAX     8       /* maximum attribute cache time */
#define NFS_MATTR_ATTRCACHE_DIR_MIN     9       /* minimum attribute cache time for dirs */
#define NFS_MATTR_ATTRCACHE_DIR_MAX     10      /* maximum attribute cache time for dirs */
#define NFS_MATTR_LOCK_MODE             11      /* advisory file locking mode (NFS_LOCK_MODE_*) */
#define NFS_MATTR_SECURITY              12      /* RPC security flavors to use */
#define NFS_MATTR_MAX_GROUP_LIST        13      /* max # of RPC AUTH_SYS groups */
#define NFS_MATTR_SOCKET_TYPE           14      /* socket transport type as a netid-like string */
#define NFS_MATTR_NFS_PORT              15      /* port # to use for NFS protocol */
#define NFS_MATTR_MOUNT_PORT            16      /* port # to use for MOUNT protocol */
#define NFS_MATTR_REQUEST_TIMEOUT       17      /* initial RPC request timeout value */
#define NFS_MATTR_SOFT_RETRY_COUNT      18      /* max RPC retransmissions for soft mounts */
#define NFS_MATTR_DEAD_TIMEOUT          19      /* how long until unresponsive mount is considered dead */
#define NFS_MATTR_FH                    20      /* file handle for mount directory */
#define NFS_MATTR_FS_LOCATIONS          21      /* list of locations for the file system */
#define NFS_MATTR_MNTFLAGS              22      /* VFS mount flags (MNT_*) */
#define NFS_MATTR_MNTFROM               23      /* fixed string to use for "f_mntfromname" */
#define NFS_MATTR_REALM                 24      /* Realm to authenticate with */
#define NFS_MATTR_PRINCIPAL             25      /* GSS principal to authenticate with */
#define NFS_MATTR_SVCPRINCIPAL          26      /* GSS principal to authenticate to, the server principal */
#define NFS_MATTR_NFS_VERSION_RANGE     27      /* Packed version range to try */
#define NFS_MATTR_KERB_ETYPE            28      /* Enctype to use for kerberos mounts */
#define NFS_MATTR_LOCAL_NFS_PORT        29      /* Unix domain socket for NFS protocol */
#define NFS_MATTR_LOCAL_MOUNT_PORT      30      /* Unix domain socket for MOUNT protocol */
#define NFS_MATTR_SET_MOUNT_OWNER       31      /* Set owner of mount point */

/* NFS mount flags */
#define NFS_MFLAG_SOFT                  0       /* soft mount (requests fail if unresponsive) */
#define NFS_MFLAG_INTR                  1       /* allow operations to be interrupted */
#define NFS_MFLAG_RESVPORT              2       /* use a reserved port */
#define NFS_MFLAG_NOCONNECT             3       /* don't connect the socket (UDP) */
#define NFS_MFLAG_DUMBTIMER             4       /* don't estimate RTT dynamically */
#define NFS_MFLAG_CALLUMNT              5       /* call MOUNTPROC_UMNT on unmount */
#define NFS_MFLAG_RDIRPLUS              6       /* request additional info when reading directories */
#define NFS_MFLAG_NONEGNAMECACHE        7       /* don't do negative name caching */
#define NFS_MFLAG_MUTEJUKEBOX           8       /* don't treat jukebox errors as unresponsive */
#define NFS_MFLAG_EPHEMERAL             9       /* ephemeral (mirror) mount */
#define NFS_MFLAG_NOCALLBACK            10      /* don't provide callback RPC service */
#define NFS_MFLAG_NAMEDATTR             11      /* don't use named attributes */
#define NFS_MFLAG_NOACL                 12      /* don't support ACLs */
#define NFS_MFLAG_ACLONLY               13      /* only support ACLs - not mode */
#define NFS_MFLAG_NFC                   14      /* send NFC strings */
#define NFS_MFLAG_NOQUOTA               15      /* don't support QUOTA requests */
#define NFS_MFLAG_MNTUDP                16      /* MOUNT protocol should use UDP */
#define NFS_MFLAG_MNTQUICK              17      /* use short timeouts while mounting */
/*                                      18         reserved */
#define NFS_MFLAG_NOOPAQUE_AUTH         19      /* don't make the mount AUTH_OPAQUE. Used by V3 */

/* Macros for packing and unpacking packed versions */
#define PVER2MAJOR(M) ((uint32_t)(((M) >> 16) & 0xffff))
#define PVER2MINOR(m) ((uint32_t)((m) & 0xffff))
#define VER2PVER(M, m) ((uint32_t)((M) << 16) | ((m) & 0xffff))

/* NFS advisory file locking modes */
#define NFS_LOCK_MODE_ENABLED           0       /* advisory file locking enabled */
#define NFS_LOCK_MODE_DISABLED          1       /* do not support advisory file locking */
#define NFS_LOCK_MODE_LOCAL             2       /* perform advisory file locking locally */

#define NFS_STRLEN_INT(str) \
	        (int)strnlen(str, INT_MAX)
#define NFS_UIO_ADDIOV(a_uio, a_baseaddr, a_length) \
	        assert(a_length <= UINT32_MAX); uio_addiov(a_uio, a_baseaddr, (uint32_t)(a_length));
#define NFS_BZERO(off, bytes) \
	do { \
	        uint32_t bytes32 = bytes > UINT32_MAX ? UINT32_MAX : (uint32_t)(bytes); \
	        bzero(off, bytes32); \
	        if (bytes > UINT32_MAX) { \
	                bzero(off + bytes32, (uint32_t)(bytes - UINT32_MAX)); \
	        } \
	} while(0);
#define NFS_ZFREE(zone, ptr) \
	do { \
	        if ((ptr)) { \
	                zfree((zone), (ptr)); \
	                (ptr) = NULL; \
	        } \
	} while (0); \

/* Supported encryption types for kerberos session keys */
typedef enum  nfs_supported_kerberos_etypes {
	NFS_DES3_CBC_SHA1_KD = 16,
	NFS_AES128_CTS_HMAC_SHA1_96 = 17,
	NFS_AES256_CTS_HMAC_SHA1_96 = 18
} nfs_supported_kerberos_etypes;

/* Structure to hold an array of kerberos enctypes to allow on a mount */
#define NFS_MAX_ETYPES 3
struct nfs_etype {
	uint32_t count;
	uint32_t selected;  /* index in etypes that is being used. Set to count if nothing has been selected */
	nfs_supported_kerberos_etypes etypes[NFS_MAX_ETYPES];
};

/*
 * Old-style arguments to mount NFS
 */
#define NFS_ARGSVERSION 6               /* change when nfs_args changes */
struct nfs_args {
	int             version;        /* args structure version number */
#ifdef KERNEL
	user32_addr_t addr;             /* file server address */
#else
	struct sockaddr *addr;          /* file server address */
#endif
	uint8_t         addrlen;        /* length of address */
	int             sotype;         /* Socket type */
	int             proto;          /* and Protocol */
#ifdef KERNEL
	user32_addr_t fh;               /* File handle to be mounted */
#else
	u_char          *fh;            /* File handle to be mounted */
#endif
	int             fhsize;         /* Size, in bytes, of fh */
	int             flags;          /* flags */
	int             wsize;          /* write size in bytes */
	int             rsize;          /* read size in bytes */
	int             readdirsize;    /* readdir size in bytes */
	int             timeo;          /* initial timeout in .1 secs */
	int             retrans;        /* times to retry send */
	int             maxgrouplist;   /* Max. size of group list */
	int             readahead;      /* # of blocks to readahead */
	int             leaseterm;      /* obsolete: Term (sec) of lease */
	int             deadthresh;     /* obsolete: Retrans threshold */
#ifdef KERNEL
	user32_addr_t hostname; /* server's name */
#else
	char            *hostname;      /* server's name */
#endif
	/* NFS_ARGSVERSION 3 ends here */
	int             acregmin;       /* reg file min attr cache timeout */
	int             acregmax;       /* reg file max attr cache timeout */
	int             acdirmin;       /* dir min attr cache timeout */
	int             acdirmax;       /* dir max attr cache timeout */
	/* NFS_ARGSVERSION 4 ends here */
	uint32_t        auth;           /* security mechanism flavor */
	/* NFS_ARGSVERSION 5 ends here */
	uint32_t        deadtimeout;    /* secs until unresponsive mount considered dead */
};

/* incremental size additions in each version of nfs_args */
#define NFS_ARGSVERSION4_INCSIZE        (4 * sizeof(int))
#define NFS_ARGSVERSION5_INCSIZE        (sizeof(uint32_t))
#define NFS_ARGSVERSION6_INCSIZE        (sizeof(uint32_t))

#ifdef KERNEL
/* LP64 version of nfs_args.  all pointers and longs
 * grow when we're dealing with a 64-bit process.
 * WARNING - keep in sync with nfs_args
 */
struct user_nfs_args {
	int             version;        /* args structure version number */
	user_addr_t     addr __attribute((aligned(8)));         /* file server address */
	uint8_t         addrlen;        /* length of address */
	int             sotype;         /* Socket type */
	int             proto;          /* and Protocol */
	user_addr_t     fh __attribute((aligned(8)));           /* File handle to be mounted */
	int             fhsize;         /* Size, in bytes, of fh */
	int             flags;          /* flags */
	int             wsize;          /* write size in bytes */
	int             rsize;          /* read size in bytes */
	int             readdirsize;    /* readdir size in bytes */
	int             timeo;          /* initial timeout in .1 secs */
	int             retrans;        /* times to retry send */
	int             maxgrouplist;   /* Max. size of group list */
	int             readahead;      /* # of blocks to readahead */
	int             leaseterm;      /* obsolete: Term (sec) of lease */
	int             deadthresh;     /* obsolete: Retrans threshold */
	user_addr_t     hostname __attribute((aligned(8)));     /* server's name */
	/* NFS_ARGSVERSION 3 ends here */
	int             acregmin;       /* reg file min attr cache timeout */
	int             acregmax;       /* reg file max attr cache timeout */
	int             acdirmin;       /* dir min attr cache timeout */
	int             acdirmax;       /* dir max attr cache timeout */
	/* NFS_ARGSVERSION 4 ends here */
	uint32_t        auth;           /* security mechanism flavor */
	/* NFS_ARGSVERSION 5 ends here */
	uint32_t        deadtimeout;    /* secs until unresponsive mount considered dead */
};
#endif // KERNEL

/*
 * Old-style NFS mount option flags
 */
#define NFSMNT_SOFT             0x00000001  /* soft mount (hard is default) */
#define NFSMNT_WSIZE            0x00000002  /* set write size */
#define NFSMNT_RSIZE            0x00000004  /* set read size */
#define NFSMNT_TIMEO            0x00000008  /* set initial timeout */
#define NFSMNT_RETRANS          0x00000010  /* set number of request retries */
#define NFSMNT_MAXGRPS          0x00000020  /* set maximum grouplist size */
#define NFSMNT_INT              0x00000040  /* allow interrupts on hard mount */
#define NFSMNT_NOCONN           0x00000080  /* Don't Connect the socket */
#define NFSMNT_NONEGNAMECACHE   0x00000100  /* Don't do negative name caching */
#define NFSMNT_NFSV3            0x00000200  /* Use NFS Version 3 protocol */
#define NFSMNT_NFSV4            0x00000400  /* Use NFS Version 4 protocol */
#define NFSMNT_DUMBTIMR         0x00000800  /* Don't estimate rtt dynamically */
#define NFSMNT_DEADTIMEOUT      0x00001000  /* unmount after a period of unresponsiveness */
#define NFSMNT_READAHEAD        0x00002000  /* set read ahead */
#define NFSMNT_CALLUMNT         0x00004000  /* call MOUNTPROC_UMNT on unmount */
#define NFSMNT_RESVPORT         0x00008000  /* Allocate a reserved port */
#define NFSMNT_RDIRPLUS         0x00010000  /* Use Readdirplus for V3 */
#define NFSMNT_READDIRSIZE      0x00020000  /* Set readdir size */
#define NFSMNT_NOLOCKS          0x00040000  /* don't support file locking */
#define NFSMNT_LOCALLOCKS       0x00080000  /* do file locking locally on client */
#define NFSMNT_ACREGMIN         0x00100000  /* reg min attr cache timeout */
#define NFSMNT_ACREGMAX         0x00200000  /* reg max attr cache timeout */
#define NFSMNT_ACDIRMIN         0x00400000  /* dir min attr cache timeout */
#define NFSMNT_ACDIRMAX         0x00800000  /* dir max attr cache timeout */
#define NFSMNT_SECFLAVOR        0x01000000  /* Use security flavor */
#define NFSMNT_SECSYSOK         0x02000000  /* Server can support auth sys */
#define NFSMNT_MUTEJUKEBOX      0x04000000  /* don't treat jukebox errors as unresponsive */
#define NFSMNT_NOQUOTA          0x08000000  /* don't support QUOTA requests */


/*
 * fs.nfs sysctl(3) NFS_MOUNTINFO defines
 */
#define NFS_MOUNT_INFO_VERSION  0       /* nfsstat mount information version */
#define NFS_MIATTR_BITMAP_LEN   1       /* length of mount info attributes bitmap */
#define NFS_MIFLAG_BITMAP_LEN   1       /* length of mount info flags bitmap */

/* NFS mount info attributes */
#define NFS_MIATTR_FLAGS                0       /* mount info flags bitmap (MIFLAG_*) */
#define NFS_MIATTR_ORIG_ARGS            1       /* original mount args passed into mount call */
#define NFS_MIATTR_CUR_ARGS             2       /* current mount args values */
#define NFS_MIATTR_CUR_LOC_INDEX        3       /* current fs location index */

/* NFS mount info flags */
#define NFS_MIFLAG_DEAD         0       /* mount is dead */
#define NFS_MIFLAG_NOTRESP      1       /* server is unresponsive */
#define NFS_MIFLAG_RECOVERY     2       /* mount in recovery */


/*
 * Structures for the nfssvc(2) syscall. Not that anyone but nfsd
 * should ever try and use it.
 */
struct nfsd_args {
	int     sock;           /* Socket to serve */
#ifdef KERNEL
	user32_addr_t   name;           /* Client addr for connection based sockets */
#else
	caddr_t name;           /* Client addr for connection based sockets */
#endif
	int     namelen;        /* Length of name */
};

#ifdef KERNEL
/* LP64 version of nfsd_args.  all pointers and longs
 * grow when we're dealing with a 64-bit process.
 * WARNING - keep in sync with nfsd_args
 */
struct user_nfsd_args {
	int             sock;           /* Socket to serve */
	user_addr_t     name __attribute((aligned(8)));         /* Client addr for connection based sockets */
	int             namelen;        /* Length of name */
};

#endif // KERNEL

/*
 * NFS Server File Handle structures
 */

/* NFS export handle identifies which NFS export */
#define NFS_FH_VERSION  0x4e580000              /* 'NX00' */
struct nfs_exphandle {
	uint32_t        nxh_version;            /* data structure version */
	uint32_t        nxh_fsid;               /* File System Export ID */
	uint32_t        nxh_expid;              /* Export ID */
	uint16_t        nxh_flags;              /* export handle flags */
	uint8_t         nxh_reserved;           /* future use */
	uint32_t        nxh_fidlen;             /* length of File ID */
};

/* nxh_flags */
#define NXHF_INVALIDFH          0x0001          /* file handle is invalid */

#define NFS_MAX_FID_SIZE        (NFS_MAX_FH_SIZE - sizeof(struct nfs_exphandle))
#define NFSV4_MAX_FID_SIZE      (NFSV4_MAX_FH_SIZE - sizeof(struct nfs_exphandle))
#define NFSV3_MAX_FID_SIZE      (NFSV3_MAX_FH_SIZE - sizeof(struct nfs_exphandle))
#define NFSV2_MAX_FID_SIZE      (NFSV2_MAX_FH_SIZE - sizeof(struct nfs_exphandle))

/* NFS server internal view of fhandle_t */
/* The first sizeof(fhandle_t) bytes must match what goes into fhandle_t. */
/* (fhp is used to allow use of an external buffer) */
struct nfs_filehandle {
	uint32_t                nfh_len;        /* total length of file handle */
	struct nfs_exphandle    nfh_xh;         /* export handle */
	unsigned char           nfh_fid[NFS_MAX_FID_SIZE]; /* File ID */
	unsigned char           *nfh_fhp;       /* pointer to file handle */
};

/*
 * NFS export data structures
 */

/* Structure to hold an array of security flavors */
#define NX_MAX_SEC_FLAVORS 5
struct nfs_sec {
	int count;
	uint32_t flavors[NX_MAX_SEC_FLAVORS];
};

struct nfs_export_net_args {
	uint32_t                nxna_flags;     /* export flags */
	struct xucred           nxna_cred;      /* mapped credential for root/all user */
	struct sockaddr_storage nxna_addr;      /* net address to which exported */
	struct sockaddr_storage nxna_mask;      /* mask for net address */
	struct nfs_sec          nxna_sec;       /* security mechanism flavors */
};

struct nfs_export_args {
	uint32_t                nxa_fsid;       /* export FS ID */
	uint32_t                nxa_expid;      /* export ID */
#ifdef KERNEL
	user32_addr_t           nxa_fspath;     /* export FS path */
	user32_addr_t           nxa_exppath;    /* export sub-path */
#else
	char                    *nxa_fspath;    /* export FS path */
	char                    *nxa_exppath;   /* export sub-path */
#endif
	uint32_t                nxa_flags;      /* export arg flags */
	uint32_t                nxa_netcount;   /* #entries in ex_nets array */
#ifdef KERNEL
	user32_addr_t           nxa_nets;       /* array of net args */
#else
	struct nfs_export_net_args *nxa_nets;   /* array of net args */
#endif
};

#ifdef KERNEL
/* LP64 version of export_args */

struct user_nfs_export_args {
	uint32_t                nxa_fsid;       /* export FS ID */
	uint32_t                nxa_expid;      /* export ID */
	user_addr_t             nxa_fspath;     /* export FS path */
	user_addr_t             nxa_exppath;    /* export sub-path */
	uint32_t                nxa_flags;      /* export arg flags */
	uint32_t                nxa_netcount;   /* #entries in ex_nets array */
	user_addr_t             nxa_nets;       /* array of net args */
};

#endif /* KERNEL */

/* nfs export arg flags */
#define NXA_DELETE              0x0001  /* delete the specified export(s) */
#define NXA_ADD                 0x0002  /* add the specified export(s) */
#define NXA_REPLACE             0x0003  /* delete and add the specified export(s) */
#define NXA_DELETE_ALL          0x0004  /* delete all exports */
#define NXA_OFFLINE             0x0008  /* export is offline */
#define NXA_CHECK               0x0010  /* check if exportable */

/* export option flags */
#define NX_READONLY             0x0001  /* exported read-only */
#define NX_DEFAULTEXPORT        0x0002  /* exported to the world */
#define NX_MAPROOT              0x0004  /* map root access to anon credential */
#define NX_MAPALL               0x0008  /* map all access to anon credential */
#define NX_32BITCLIENTS         0x0020  /* restrict directory cookies to 32 bits */
#define NX_OFFLINE              0x0040  /* export is offline */
#define NX_MANGLEDNAMES         0x0080  /* export will return mangled names for names > 255 bytes */

/*
 * fs.nfs sysctl(3) export stats record structures
 */
#define NFS_EXPORT_STAT_REC_VERSION 1   /* export stat record version */
#define NFS_USER_STAT_REC_VERSION 1     /* active user list record version */

/* descriptor describing following records */
struct nfs_export_stat_desc {
	uint32_t rec_vers;              /* version of export stat records */
	uint64_t rec_count;             /* total record count */
}__attribute__((__packed__));

/* export stat record containing path and stat counters */
struct nfs_export_stat_rec {
	char     path[RPCMNT_PATHLEN + 1];
	uint64_t ops;           /* Count of NFS Requests received for this export */
	uint64_t bytes_read;    /* Count of bytes read from this export */
	uint64_t bytes_written; /* Count of bytes written to this export */
}__attribute__((__packed__));

/* Active user list stat buffer descriptor */
struct nfs_user_stat_desc {
	uint32_t rec_vers;      /* version of active user stat records */
	uint32_t rec_count;     /* total record count */
}__attribute__((__packed__));

/* Active user list user stat record format */
struct nfs_user_stat_user_rec {
	u_char                  rec_type;
	uid_t                   uid;
	struct sockaddr_storage sock;
	uint64_t                ops;
	uint64_t                bytes_read;
	uint64_t                bytes_written;
	time_t                  tm_start;
	time_t                  tm_last;
}__attribute__((__packed__));

/* Active user list path record format */
struct nfs_user_stat_path_rec {
	u_char  rec_type;
	char    path[RPCMNT_PATHLEN + 1];
}__attribute__((__packed__));

/* Defines for rec_type field of
 * nfs_user_stat_rec & nfs_user_stat_rec
 * data structures
 */
#define NFS_USER_STAT_USER_REC  0
#define NFS_USER_STAT_PATH_REC  1


#ifdef KERNEL
struct nfs_exportfs;

struct nfs_export_options {
	uint32_t                nxo_flags;      /* export options */
	kauth_cred_t            nxo_cred;       /* mapped credential */
	struct nfs_sec          nxo_sec;        /* security mechanism flavors */
};

/* Network address lookup element and individual export options */
struct nfs_netopt {
	struct radix_node               no_rnodes[2];   /* radix tree glue */
	struct nfs_export_options       no_opt;         /* export options */
};

/* statistic counters for each exported directory
 *
 * Since 64-bit atomic operations are not available on 32-bit platforms,
 * 64-bit counters are implemented using 32-bit integers and 32-bit
 * atomic operations
 */
typedef struct nfsstatcount64 {
	uint32_t        hi;
	uint32_t        lo;
} nfsstatcount64;

struct nfs_export_stat_counters {
	struct nfsstatcount64 ops;              /* Count of NFS Requests received for this export  */
	struct nfsstatcount64 bytes_read;       /* Count of bytes read from this export */
	struct nfsstatcount64 bytes_written;    /* Count of bytes written to his export */
};

/* Macro for updating nfs export stat counters */
#define NFSStatAdd64(PTR, VAL) \
	do { \
	        uint32_t NFSSA_OldValue = \
	        OSAddAtomic((VAL), &(PTR)->lo); \
	        if ((NFSSA_OldValue + (VAL)) < NFSSA_OldValue) \
	                OSAddAtomic(1, &(PTR)->hi); \
	} while (0)

/* Some defines for dealing with active user list stats */
#define NFSRV_USER_STAT_DEF_MAX_NODES 1024      /* default active user list size limit */
#define NFSRV_USER_STAT_DEF_IDLE_SEC  7200      /* default idle seconds (node no longer considered active) */

/* active user list globals */
extern uint32_t nfsrv_user_stat_enabled;                /* enable/disable active user list */
extern uint32_t nfsrv_user_stat_node_count;             /* current count of user stat nodes */
extern uint32_t nfsrv_user_stat_max_idle_sec;   /* idle seconds (node no longer considered active) */
extern uint32_t nfsrv_user_stat_max_nodes;              /* active user list size limit */
extern lck_grp_t nfsrv_active_user_mutex_group;

/* An active user node represented in the kernel */
struct nfs_user_stat_node {
	TAILQ_ENTRY(nfs_user_stat_node) lru_link;
	LIST_ENTRY(nfs_user_stat_node)  hash_link;
	uid_t                   uid;
	struct sockaddr_storage sock;
	uint64_t                ops;
	uint64_t                bytes_read;
	uint64_t                bytes_written;
	time_t                  tm_start;
	time_t                  tm_last;
};

/* Hash table for active user nodes */
#define NFS_USER_STAT_HASH_SIZE 16      /* MUST be a power of 2 */
#define NFS_USER_STAT_HASH(userhashtbl, uid) \
	        &((userhashtbl)[(uid) & (NFS_USER_STAT_HASH_SIZE - 1)])

TAILQ_HEAD(nfs_user_stat_lru_head, nfs_user_stat_node);
LIST_HEAD(nfs_user_stat_hashtbl_head, nfs_user_stat_node);

/* Active user list data structure */
/* One per exported directory */
struct nfs_active_user_list {
	struct nfs_user_stat_lru_head           user_lru;
	struct nfs_user_stat_hashtbl_head       user_hashtbl[NFS_USER_STAT_HASH_SIZE];
	uint32_t                                node_count;
	lck_mtx_t user_mutex;
};


/* Network export information */
/* one of these for each exported directory */
struct nfs_export {
	LIST_ENTRY(nfs_export)          nx_next;        /* FS export list */
	LIST_ENTRY(nfs_export)          nx_hash;        /* export hash chain */
	struct nfs_export               *nx_parent;     /* parent export */
	uint32_t                        nx_id;          /* export ID */
	uint32_t                        nx_flags;       /* export flags */
	struct nfs_exportfs             *nx_fs;         /* exported file system */
	char                            *nx_path;       /* exported file system sub-path */
	struct nfs_filehandle           nx_fh;          /* export root file handle */
	struct nfs_export_options       nx_defopt;      /* default options */
	uint32_t                        nx_expcnt;      /* # exports in table */
	struct radix_node_head          *nx_rtable[AF_MAX + 1]; /* table of exports (netopts) */
	struct nfs_export_stat_counters nx_stats;       /* statistic counters for this exported directory */
	struct nfs_active_user_list     nx_user_list;   /* Active User List for this exported directory */
	struct timeval                  nx_exptime;     /* time of export for write verifier */
};

/* NFS exported file system info */
/* one of these for each exported file system */
struct nfs_exportfs {
	LIST_ENTRY(nfs_exportfs)        nxfs_next;      /* exported file system list */
	uint32_t                        nxfs_id;        /* exported file system ID */
	char                            *nxfs_path;     /* exported file system path */
	LIST_HEAD(, nfs_export)          nxfs_exports;   /* list of exports for this file system */
};

extern LIST_HEAD(nfsrv_expfs_list, nfs_exportfs) nfsrv_exports;
extern lck_rw_t nfsrv_export_rwlock;  // lock for export data structures
#define NFSRVEXPHASHSZ  64
#define NFSRVEXPHASHVAL(FSID, EXPID)    \
	(((FSID) >> 24) ^ ((FSID) >> 16) ^ ((FSID) >> 8) ^ (EXPID))
#define NFSRVEXPHASH(FSID, EXPID)       \
	(&nfsrv_export_hashtbl[NFSRVEXPHASHVAL((FSID),(EXPID)) & nfsrv_export_hash])
extern LIST_HEAD(nfsrv_export_hashhead, nfs_export) * nfsrv_export_hashtbl;
extern u_long nfsrv_export_hash;

#if CONFIG_FSE
/*
 * NFS server file mod fsevents
 */
struct nfsrv_fmod {
	LIST_ENTRY(nfsrv_fmod)  fm_link;
	vnode_t                 fm_vp;
	struct vfs_context      fm_context;
	uint64_t                fm_deadline;
};

#define NFSRVFMODHASHSZ 128
#define NFSRVFMODHASH(vp) (((uintptr_t) vp) & nfsrv_fmod_hash)
extern LIST_HEAD(nfsrv_fmod_hashhead, nfsrv_fmod) * nfsrv_fmod_hashtbl;
extern u_long nfsrv_fmod_hash;
extern lck_mtx_t nfsrv_fmod_mutex;
extern int nfsrv_fmod_pending, nfsrv_fsevents_enabled;
#endif

extern int nfsrv_async, nfsrv_export_hash_size,
    nfsrv_reqcache_size, nfsrv_sock_max_rec_queue_length;
extern uint32_t nfsrv_gss_context_ttl;
extern struct nfsstats nfsstats;
#define NFS_UC_Q_DEBUG
#ifdef NFS_UC_Q_DEBUG
extern int nfsrv_uc_use_proxy;
extern uint32_t nfsrv_uc_queue_limit;
extern uint32_t nfsrv_uc_queue_max_seen;
extern volatile uint32_t nfsrv_uc_queue_count;
#endif

#endif // KERNEL

/*
 * XXX to allow amd to include nfs.h without nfsproto.h
 */
#ifdef NFS_NPROCS
/*
 * Stats structure
 */
struct nfsstats {
	uint64_t        attrcache_hits;
	uint64_t        attrcache_misses;
	uint64_t        lookupcache_hits;
	uint64_t        lookupcache_misses;
	uint64_t        direofcache_hits;
	uint64_t        direofcache_misses;
	uint64_t        biocache_reads;
	uint64_t        read_bios;
	uint64_t        read_physios;
	uint64_t        biocache_writes;
	uint64_t        write_bios;
	uint64_t        write_physios;
	uint64_t        biocache_readlinks;
	uint64_t        readlink_bios;
	uint64_t        biocache_readdirs;
	uint64_t        readdir_bios;
	uint64_t        rpccnt[NFS_NPROCS];
	uint64_t        rpcretries;
	uint64_t        srvrpccnt[NFS_NPROCS];
	uint64_t        srvrpc_errs;
	uint64_t        srv_errs;
	uint64_t        rpcrequests;
	uint64_t        rpctimeouts;
	uint64_t        rpcunexpected;
	uint64_t        rpcinvalid;
	uint64_t        srvcache_inproghits;
	uint64_t        srvcache_idemdonehits;
	uint64_t        srvcache_nonidemdonehits;
	uint64_t        srvcache_misses;
	uint64_t        srvvop_writes;
	uint64_t        pageins;
	uint64_t        pageouts;
};
#endif

/*
 * Flags for nfssvc() system call.
 */
#define NFSSVC_NFSD     0x004
#define NFSSVC_ADDSOCK  0x008
#define NFSSVC_EXPORT   0x200

/*
 * Flags for nfsclnt() system call.
 */
#define NFSCLNT_LOCKDANS        0x200
#define NFSCLNT_LOCKDNOTIFY     0x400
#define NFSCLNT_TESTIDMAP       0x001

#include <sys/_types/_guid_t.h> /* for guid_t below */
#define MAXIDNAMELEN            1024
struct nfs_testmapid {
	uint32_t                ntm_lookup;     /* lookup name 2 id or id 2 name */
	uint32_t                ntm_grpflag;    /* Is this a group or user maping */
	uint32_t                ntm_id;         /* id to map or return */
	uint32_t                pad;
	guid_t                  ntm_guid;       /* intermidiate guid used in conversion */
	char                    ntm_name[MAXIDNAMELEN]; /* name to map or return */
};

#define NTM_ID2NAME     0
#define NTM_NAME2ID     1
#define NTM_NAME2GUID   2
#define NTM_GUID2NAME   3

/*
 * fs.nfs sysctl(3) identifiers
 */
#define NFS_NFSSTATS        1       /* struct: struct nfsstats */
#define NFS_EXPORTSTATS     3       /* gets exported directory stats */
#define NFS_USERSTATS       4       /* gets exported directory active user stats */
#define NFS_USERCOUNT       5       /* gets current count of active nfs users */
#define NFS_MOUNTINFO       6       /* gets information about an NFS mount */
#define NFS_NFSZEROSTATS    7       /* zero nfs statistics */

#ifndef NFS_WDELAYHASHSIZ
#define NFS_WDELAYHASHSIZ 16    /* and with this */
#endif

#ifdef KERNEL
#include <sys/kernel_types.h>
#include <kern/thread_call.h>
#include <sys/kdebug.h>

#define NFS_KERNEL_DEBUG KERNEL_DEBUG

/* kernel debug trace macros */
#define FSDBG(A, B, C, D, E) \
	NFS_KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, (A))) | DBG_FUNC_NONE, \
	        (int)(B), (int)(C), (int)(D), (int)(E), 0)
#define FSDBG_TOP(A, B, C, D, E) \
	NFS_KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, (A))) | DBG_FUNC_START, \
	        (int)(B), (int)(C), (int)(D), (int)(E), 0)
#define FSDBG_BOT(A, B, C, D, E) \
	NFS_KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, (A))) | DBG_FUNC_END, \
	        (int)(B), (int)(C), (int)(D), (int)(E), 0)

#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_NFSMNT);
MALLOC_DECLARE(M_NFSBIO);
MALLOC_DECLARE(M_NFSDIROFF);
MALLOC_DECLARE(M_NFSRVDESC);
MALLOC_DECLARE(M_NFSD);
MALLOC_DECLARE(M_NFSBIGFH);
#endif

struct vnode_attr; struct nameidata; struct dqblk; struct sockaddr_in; /* XXX */
struct nfsbuf;
struct nfs_vattr;
struct nfs_fsattr;
struct nfsnode;
typedef struct nfsnode * nfsnode_t;
struct nfs_open_owner;
struct nfs_open_file;
struct nfs_lock_owner;
struct nfs_file_lock;
struct nfsreq;
struct nfs_rpc_record_state;
struct nfs_fs_locations;
struct nfs_location_index;
struct nfs_socket;
struct nfs_socket_search;
struct nfsrv_uc_arg;
struct direntry;

/*
 * The set of signals the interrupt an I/O in progress for NFSMNT_INT mounts.
 * What should be in this set is open to debate, but I believe that since
 * I/O system calls on ufs are never interrupted by signals the set should
 * be minimal. My reasoning is that many current programs that use signals
 * such as SIGALRM will not expect file I/O system calls to be interrupted
 * by them and break.
 */
#define NFSINT_SIGMASK  (sigmask(SIGINT)|sigmask(SIGTERM)|sigmask(SIGKILL)| \
	                 sigmask(SIGHUP)|sigmask(SIGQUIT))

extern size_t nfs_mbuf_mhlen, nfs_mbuf_minclsize;

/*
 * NFS mbuf chain structure used for managing the building/dissection of RPCs
 */
struct nfsm_chain {
	mbuf_t          nmc_mhead;      /* mbuf chain head */
	mbuf_t          nmc_mcur;       /* current mbuf */
	caddr_t         nmc_ptr;        /* pointer into current mbuf */
	size_t          nmc_left;       /* bytes remaining in current mbuf */
	uint32_t        nmc_flags;      /* flags for this nfsm_chain */
};
#define NFSM_CHAIN_FLAG_ADD_CLUSTERS    0x1     /* always add mbuf clusters */

/*
 * Each retransmission of an RPCSEC_GSS request
 * has an additional sequence number.
 */
struct gss_seq {
	SLIST_ENTRY(gss_seq)    gss_seqnext;
	uint32_t                gss_seqnum;
};

/**
 * nfsreq callback args
 */
struct nfsreq_cbargs {
	off_t offset;
	size_t length;
	uint32_t stategenid;
};

/*
 * async NFS request callback info
 */
struct nfsreq_cbinfo {
	void                    (*rcb_func)(struct nfsreq *);   /* async request callback function */
	struct nfsbuf           *rcb_bp;                        /* buffer I/O RPC is for */
	struct nfsreq_cbargs    rcb_args;                       /* nfsreq callback args */
};

/*
 * Arguments to use if a request needs to call SECINFO to handle a WRONGSEC error
 *
 * If only node is set, use the parent file handle and this node's name; otherwise,
 * use any file handle and name provided.
 */
struct nfsreq_secinfo_args {
	nfsnode_t               rsia_np;                /* the node */
	const char              *rsia_name;             /* alternate name string */
	u_char                  *rsia_fh;               /* alternate file handle */
	uint32_t                rsia_namelen;           /* length of string */
	uint32_t                rsia_fhsize;            /* length of fh */
};
#define NFSREQ_SECINFO_SET(SI, NP, FH, FHSIZE, NAME, NAMELEN) \
	do { \
	        (SI)->rsia_np = (NP); \
	        (SI)->rsia_fh = (FH); \
	        (SI)->rsia_fhsize = (FHSIZE); \
	        (SI)->rsia_name = (NAME); \
	        (SI)->rsia_namelen = (NAMELEN); \
	} while (0)

/*
 * NFS outstanding request list element
 */
struct nfsreq {
	lck_mtx_t               r_mtx;          /* NFS request mutex */
	TAILQ_ENTRY(nfsreq)     r_chain;        /* request queue chain */
	TAILQ_ENTRY(nfsreq)     r_achain;       /* mount's async I/O request queue chain */
	TAILQ_ENTRY(nfsreq)     r_rchain;       /* mount's async I/O resend queue chain */
	TAILQ_ENTRY(nfsreq)     r_cchain;       /* mount's cwnd queue chain */
	mbuf_t                  r_mrest;        /* request body mbufs */
	mbuf_t                  r_mhead;        /* request header mbufs */
	struct nfsm_chain       r_nmrep;        /* reply mbufs */
	nfsnode_t               r_np;           /* NFS node */
	struct nfsmount         *r_nmp;         /* NFS mount point */
	uint64_t                r_xid;          /* RPC transaction ID */
	uint32_t                r_procnum;      /* NFS procedure number */
	size_t                  r_mreqlen;      /* request length */
	int                     r_flags;        /* flags on request, see below */
	int                     r_lflags;       /* flags protected by list mutex, see below */
	int                     r_refs;         /* # outstanding references */
	uint8_t                 r_delay;        /* delay to use for jukebox error */
	uint32_t                r_retry;        /* max retransmission count */
	uint8_t                 r_rexmit;       /* current retrans count */
	int                     r_rtt;          /* RTT for rpc */
	thread_t                r_thread;       /* thread that did I/O system call */
	kauth_cred_t            r_cred;         /* credential used for request */
	time_t                  r_start;        /* request start time */
	time_t                  r_lastmsg;      /* time of last tprintf */
	time_t                  r_resendtime;   /* time of next jukebox error resend */
	struct nfs_gss_clnt_ctx *r_gss_ctx;     /* RPCSEC_GSS context */
	SLIST_HEAD(, gss_seq)   r_gss_seqlist;  /* RPCSEC_GSS sequence numbers */
	size_t                  r_gss_argoff;   /* RPCSEC_GSS offset to args */
	uint32_t                r_gss_arglen;   /* RPCSEC_GSS arg length */
	uint32_t                r_auth;         /* security flavor request sent with */
	uint32_t                *r_wrongsec;    /* wrongsec: other flavors to try */
	int                     r_error;        /* request error */
	struct nfsreq_cbinfo    r_callback;     /* callback info */
	struct nfsreq_secinfo_args r_secinfo;   /* secinfo args */
};

/*
 * Queue head for nfsreq's
 */
TAILQ_HEAD(nfs_reqqhead, nfsreq);
extern struct nfs_reqqhead nfs_reqq;
extern lck_grp_t nfs_request_grp;

#define R_XID32(x)      ((x) & 0xffffffff)

#define NFSNOLIST       ((void *)0x0badcafe)    /* sentinel value for nfs lists */
#define NFSREQNOLIST    NFSNOLIST               /* sentinel value for nfsreq lists */

/* Flag values for r_flags */
#define R_TIMING        0x00000001      /* timing request (in mntp) */
#define R_CWND          0x00000002      /* request accounted for in congestion window */
#define R_SOFTTERM      0x00000004      /* request terminated (e.g. soft mnt) */
#define R_RESTART       0x00000008      /* RPC should be restarted. */
#define R_INITTED       0x00000010      /* request has been initialized */
#define R_TPRINTFMSG    0x00000020      /* Did a tprintf msg. */
#define R_MUSTRESEND    0x00000040      /* Must resend request */
#define R_ALLOCATED     0x00000080      /* request was allocated */
#define R_SENT          0x00000100      /* request has been sent */
#define R_WAITSENT      0x00000200      /* someone is waiting for request to be sent */
#define R_RESENDERR     0x00000400      /* resend failed */
#define R_JBTPRINTFMSG  0x00000800      /* Did a tprintf msg for jukebox error */
#define R_ASYNC         0x00001000      /* async request */
#define R_ASYNCWAIT     0x00002000      /* async request now being waited on */
#define R_RESENDQ       0x00004000      /* async request currently on resendq */
#define R_SENDING       0x00008000      /* request currently being sent */
#define R_SOFT          0x00010000      /* request is soft - don't retry or reconnect */
#define R_IOD           0x00020000      /* request is being managed by an IOD */

#define R_NOINTR        0x20000000      /* request should not be interupted by a signal */
#define R_RECOVER       0x40000000      /* a state recovery RPC - during NFSSTA_RECOVER */
#define R_SETUP         0x80000000      /* a setup RPC - during (re)connection */
#define R_OPTMASK       0xe0000000      /* mask of all RPC option flags */

/* Flag values for r_lflags */
#define RL_BUSY         0x0001          /* Locked. */
#define RL_WAITING      0x0002          /* Someone waiting for lock. */
#define RL_QUEUED       0x0004          /* request is on the queue */

extern u_int64_t nfs_xid, nfs_xidwrap;
extern int nfs_iosize, nfs_allow_async, nfs_statfs_rate_limit;
extern int nfs_access_cache_timeout, nfs_access_delete, nfs_access_dotzfs, nfs_access_for_getattr;
extern int nfs_lockd_mounts, nfs_lockd_request_sent;
extern int nfs_tprintf_initial_delay, nfs_tprintf_delay;
extern int nfsiod_thread_count, nfsiod_thread_max, nfs_max_async_writes;
extern int nfs_idmap_ctrl, nfs_callback_port;
extern int nfs_is_mobile, nfs_readlink_nocache, nfs_root_steals_ctx;
extern uint32_t nfs_tcp_sockbuf;
extern uint32_t nfs_squishy_flags;
extern uint32_t nfs_debug_ctl;

/* bits for nfs_idmap_ctrl: */
#define NFS_IDMAP_CTRL_USE_IDMAP_SERVICE                0x00000001 /* use the ID mapping service */
#define NFS_IDMAP_CTRL_FALLBACK_NO_COMMON_IDS           0x00000002 /* fallback should NOT handle common IDs like "root" and "nobody" */
#define NFS_IDMAP_CTRL_LOG_FAILED_MAPPINGS              0x00000020 /* log failed ID mapping attempts */
#define NFS_IDMAP_CTRL_LOG_SUCCESSFUL_MAPPINGS          0x00000040 /* log successful ID mapping attempts */

#define NFSIOD_MAX      (MIN(nfsiod_thread_max, NFS_MAXASYNCTHREAD))

struct nfs_dulookup {
	int du_flags;                   /* state of ._ lookup */
#define NFS_DULOOKUP_DOIT       0x1
#define NFS_DULOOKUP_INPROG     0x2
	struct componentname du_cn;     /* ._ name being looked up */
	struct nfsreq du_req;           /* NFS request for lookup */
	char du_smallname[48];          /* buffer for small names */
};

/*
 * One nfsrv_sock structure is maintained for each socket the
 * server is servicing requests on.
 */
struct nfsrv_sock {
	TAILQ_ENTRY(nfsrv_sock) ns_chain;       /* List of all nfsrv_sock's */
	TAILQ_ENTRY(nfsrv_sock) ns_svcq;        /* List of sockets needing servicing */
	TAILQ_ENTRY(nfsrv_sock) ns_wgq;         /* List of sockets with a pending write gather */
	struct nfsrv_uc_arg *ns_ua;             /* Opaque pointer to upcall */
	lck_rw_t        ns_rwlock;              /* lock for most fields */
	socket_t        ns_so;
	mbuf_t          ns_nam;
	mbuf_t          ns_raw;
	mbuf_t          ns_rawend;
	mbuf_t          ns_rec;
	mbuf_t          ns_recend;
	mbuf_t          ns_frag;
	int             ns_flag;
	int             ns_sotype;
	size_t          ns_cc;
	size_t          ns_reclen;
	int             ns_reccnt;
	int             ns_sobufsize;
	u_int32_t       ns_sref;
	time_t          ns_timestamp;           /* socket timestamp */
	lck_mtx_t       ns_wgmutex;             /* mutex for write gather fields */
	time_t          ns_wgtime;              /* next Write deadline (usec) */
	LIST_HEAD(, nfsrv_descript) ns_tq;      /* Write gather lists */
	LIST_HEAD(nfsrv_wg_delayhash, nfsrv_descript) ns_wdelayhashtbl[NFS_WDELAYHASHSIZ];
};

/* Bits for "ns_flag" */
#define SLP_VALID       0x0001 /* nfs sock valid */
#define SLP_DOREC       0x0002 /* nfs sock has received data to process */
#define SLP_NEEDQ       0x0004 /* network socket has data to receive */
#define SLP_DISCONN     0x0008 /* socket needs to be zapped */
#define SLP_GETSTREAM   0x0010 /* currently in nfsrv_getstream() */
#define SLP_LASTFRAG    0x0020 /* on last fragment of RPC record */
#define SLP_DOWRITES    0x0040 /* nfs sock has gathered writes to service */
#define SLP_WORKTODO    0x004e /* mask of all "work to do" flags */
#define SLP_ALLFLAGS    0x007f
#define SLP_WAITQ       0x4000 /* nfs sock is on the wait queue */
#define SLP_WORKQ       0x8000 /* nfs sock is on the work queue */
#define SLP_QUEUED      0xc000 /* nfs sock is on a queue */

#define SLPNOLIST ((struct nfsrv_sock *)0xdeadbeef)     /* sentinel value for sockets not in the nfsrv_sockwg list */

extern struct nfsrv_sock *nfsrv_udpsock, *nfsrv_udp6sock;

/*
 * global NFS server socket lists:
 *
 * nfsrv_socklist - list of all sockets (ns_chain)
 * nfsrv_sockwait - sockets w/new data waiting to be worked on (ns_svcq)
 * nfsrv_sockwork - sockets being worked on which may have more work to do (ns_svcq)
 * nfsrv_sockwg - sockets with pending write gather input (ns_wgq)
 */
extern TAILQ_HEAD(nfsrv_sockhead, nfsrv_sock) nfsrv_socklist, nfsrv_sockwg,
nfsrv_sockwait, nfsrv_sockwork;

/* lock groups for nfsrv_sock's */
extern lck_grp_t nfsrv_slp_rwlock_group;
extern lck_grp_t nfsrv_slp_mutex_group;

/*
 * One of these structures is allocated for each nfsd.
 */
struct nfsd {
	TAILQ_ENTRY(nfsd)       nfsd_chain;     /* List of all nfsd's */
	TAILQ_ENTRY(nfsd)       nfsd_queue;     /* List of waiting nfsd's */
	int                     nfsd_flag;      /* NFSD_ flags */
	struct nfsrv_sock       *nfsd_slp;      /* Current socket */
	struct nfsrv_descript   *nfsd_nd;       /* Associated nfsrv_descript */
};

/* Bits for "nfsd_flag" */
#define NFSD_WAITING    0x01
#define NFSD_REQINPROG  0x02

/*
 * This structure is used by the server for describing each request.
 * Some fields are used only when write request gathering is performed.
 */
struct nfsrv_descript {
	time_t                  nd_time;        /* Write deadline (usec) */
	off_t                   nd_off;         /* Start byte offset */
	off_t                   nd_eoff;        /* and end byte offset */
	LIST_ENTRY(nfsrv_descript) nd_hash;     /* Hash list */
	LIST_ENTRY(nfsrv_descript) nd_tq;       /* and timer list */
	LIST_HEAD(, nfsrv_descript) nd_coalesce; /* coalesced writes */
	struct nfsm_chain       nd_nmreq;       /* Request mbuf chain */
	mbuf_t                  nd_mrep;        /* Reply mbuf list (WG) */
	mbuf_t                  nd_nam;         /* and socket addr */
	mbuf_t                  nd_nam2;        /* return socket addr */
	u_int32_t               nd_procnum;     /* RPC # */
	int                     nd_stable;      /* storage type */
	int                     nd_vers;        /* NFS version */
	int                     nd_len;         /* Length of this write */
	int                     nd_repstat;     /* Reply status */
	u_int32_t               nd_retxid;      /* Reply xid */
	struct timeval          nd_starttime;   /* Time RPC initiated */
	struct nfs_filehandle   nd_fh;          /* File handle */
	uint32_t                nd_sec;         /* Security flavor */
	struct nfs_gss_svc_ctx  *nd_gss_context;/* RPCSEC_GSS context */
	uint32_t                nd_gss_seqnum;  /* RPCSEC_GSS seq num */
	mbuf_t                  nd_gss_mb;      /* RPCSEC_GSS results mbuf */
	kauth_cred_t            nd_cr;          /* Credentials */
};

extern TAILQ_HEAD(nfsd_head, nfsd) nfsd_head, nfsd_queue;

typedef int (*nfsrv_proc_t)(struct nfsrv_descript *, struct nfsrv_sock *,
    vfs_context_t, mbuf_t *);

/* mutex for nfs server */
extern lck_mtx_t nfsd_mutex;
extern int nfsd_thread_count, nfsd_thread_max;

/* request list mutex */
extern lck_mtx_t nfs_request_mutex;
extern int nfs_request_timer_on;

/* mutex for nfs client globals */
extern lck_mtx_t nfs_global_mutex;

#if CONFIG_NFS4
/* NFSv4 callback globals */
extern int nfs4_callback_timer_on;
extern in_port_t nfs4_cb_port, nfs4_cb_port6;

/* nfs 4 default domain for user mapping */
extern char nfs4_default_domain[MAXPATHLEN];
/* nfs 4 timer call structure */
extern thread_call_t    nfs4_callback_timer_call;
#endif

/* nfs timer call structures */
extern thread_call_t    nfs_request_timer_call;
extern thread_call_t    nfs_buf_timer_call;
extern thread_call_t    nfsrv_idlesock_timer_call;
#if CONFIG_FSE
extern thread_call_t    nfsrv_fmod_timer_call;
#endif

__BEGIN_DECLS

nfstype vtonfs_type(enum vtype, int);
enum vtype nfstov_type(nfstype, int);
int     vtonfsv2_mode(enum vtype, mode_t);

void    nfs_mbuf_init(void);

void    nfs_nhinit_finish(void);
u_long  nfs_hash(u_char *, int);

#if CONFIG_NFS4
int     nfs4_init_clientid(struct nfsmount *);
int     nfs4_setclientid(struct nfsmount *);
int     nfs4_renew(struct nfsmount *, int);
void    nfs4_renew_timer(void *, void *);
void    nfs4_mount_callback_setup(struct nfsmount *);
void    nfs4_mount_callback_shutdown(struct nfsmount *);
void    nfs4_cb_accept(socket_t, void *, int);
void    nfs4_cb_rcv(socket_t, void *, int);
void    nfs4_callback_timer(void *, void *);
int     nfs4_secinfo_rpc(struct nfsmount *, struct nfsreq_secinfo_args *, kauth_cred_t, uint32_t *, int *);
int     nfs4_get_fs_locations(struct nfsmount *, nfsnode_t, u_char *, int, const char *, vfs_context_t, struct nfs_fs_locations *);
void    nfs4_default_attrs_for_referral_trigger(nfsnode_t, char *, int, struct nfs_vattr *, fhandle_t *);
#endif

void    nfs_fs_locations_cleanup(struct nfs_fs_locations *);

int     nfs_sockaddr_cmp(struct sockaddr *, struct sockaddr *);
int     nfs_connect(struct nfsmount *, int, int);
void    nfs_disconnect(struct nfsmount *);
void    nfs_need_reconnect(struct nfsmount *);
void    nfs_mount_sock_thread_wake(struct nfsmount *);
int     nfs_mount_check_dead_timeout(struct nfsmount *);
int     nfs_mount_gone(struct nfsmount *);
void    nfs_mount_rele(struct nfsmount *);
void    nfs_mount_zombie(struct nfsmount *, int);
void    nfs_mount_make_zombie(struct nfsmount *);

void    nfs_rpc_record_state_init(struct nfs_rpc_record_state *);
void    nfs_rpc_record_state_cleanup(struct nfs_rpc_record_state *);
int     nfs_rpc_record_read(socket_t, struct nfs_rpc_record_state *, int, int *, mbuf_t *);

int     nfs_getattr(nfsnode_t, struct nfs_vattr *, vfs_context_t, int);
int     nfs_getattrcache(nfsnode_t, struct nfs_vattr *, int);
int     nfs_loadattrcache(nfsnode_t, struct nfs_vattr *, u_int64_t *, int);
long    nfs_attrcachetimeout(nfsnode_t);

int     nfs_buf_page_inval(vnode_t vp, off_t offset);
int     nfs_vinvalbuf(vnode_t, int, vfs_context_t, int);
int     nfs_vinvalbuf2(vnode_t, int, thread_t, kauth_cred_t, int);
int     nfs_vinvalbuf_internal(nfsnode_t, int, thread_t, kauth_cred_t, int, int);
void    nfs_wait_bufs(nfsnode_t);

int     nfs_request_create(nfsnode_t, mount_t, struct nfsm_chain *, int, thread_t, kauth_cred_t, struct nfsreq **);
void    nfs_request_destroy(struct nfsreq *);
void    nfs_request_ref(struct nfsreq *, int);
void    nfs_request_rele(struct nfsreq *);
int     nfs_request_add_header(struct nfsreq *);
int     nfs_request_send(struct nfsreq *, int);
void    nfs_request_wait(struct nfsreq *);
int     nfs_request_finish(struct nfsreq *, struct nfsm_chain *, int *);
int     nfs_request(nfsnode_t, mount_t, struct nfsm_chain *, int, vfs_context_t, struct nfsreq_secinfo_args *, struct nfsm_chain *, u_int64_t *, int *);
int     nfs_request2(nfsnode_t, mount_t, struct nfsm_chain *, int, thread_t, kauth_cred_t, struct nfsreq_secinfo_args *, int, struct nfsm_chain *, u_int64_t *, int *);
int     nfs_request_gss(mount_t, struct nfsm_chain *, thread_t, kauth_cred_t, int, struct nfs_gss_clnt_ctx *, struct nfsm_chain *, int *);
int     nfs_request_async(nfsnode_t, mount_t, struct nfsm_chain *, int, thread_t, kauth_cred_t, struct nfsreq_secinfo_args *, int, struct nfsreq_cbinfo *, struct nfsreq **);
int     nfs_request_async_finish(struct nfsreq *, struct nfsm_chain *, u_int64_t *, int *);
void    nfs_request_async_cancel(struct nfsreq *);
void    nfs_request_timer(void *, void *);
int     nfs_request_using_gss(struct nfsreq *);
void    nfs_get_xid(uint64_t *);
int     nfs_sigintr(struct nfsmount *, struct nfsreq *, thread_t, int);
int     nfs_noremotehang(thread_t);

int     nfs_send(struct nfsreq *, int);
int     nfs_sndlock(struct nfsreq *);
void    nfs_sndunlock(struct nfsreq *);

int     nfs_uaddr2sockaddr(const char *, struct sockaddr *);

int     nfs_aux_request(struct nfsmount *, thread_t, struct sockaddr *, socket_t, int, mbuf_t, uint32_t, int, int, struct nfsm_chain *);
int     nfs_portmap_lookup(struct nfsmount *, vfs_context_t, struct sockaddr *, socket_t, uint32_t, uint32_t, uint32_t, int);

void    nfs_location_next(struct nfs_fs_locations *, struct nfs_location_index *);
int     nfs_location_index_cmp(struct nfs_location_index *, struct nfs_location_index *);
void    nfs_location_mntfromname(struct nfs_fs_locations *, struct nfs_location_index, char *, size_t, int);
int     nfs_socket_create(struct nfsmount *, struct sockaddr *, uint8_t, in_port_t, uint32_t, uint32_t, int, struct nfs_socket **);
void    nfs_socket_destroy(struct nfs_socket *);
void    nfs_socket_options(struct nfsmount *, struct nfs_socket *);
void    nfs_connect_upcall(socket_t, void *, int);
int     nfs_connect_error_class(int);
int     nfs_connect_search_loop(struct nfsmount *, struct nfs_socket_search *);
void    nfs_socket_search_update_error(struct nfs_socket_search *, int);
void    nfs_socket_search_cleanup(struct nfs_socket_search *);
void    nfs_mount_connect_thread(void *, __unused wait_result_t);

int     nfs_lookitup(nfsnode_t, char *, int, vfs_context_t, nfsnode_t *);
void    nfs_dulookup_init(struct nfs_dulookup *, nfsnode_t, const char *, int, vfs_context_t);
void    nfs_dulookup_start(struct nfs_dulookup *, nfsnode_t, vfs_context_t);
void    nfs_dulookup_finish(struct nfs_dulookup *, nfsnode_t, vfs_context_t);
int     nfs_dir_buf_cache_lookup(nfsnode_t, nfsnode_t *, struct componentname *, vfs_context_t, int, int *);
int     nfs_dir_buf_search(struct nfsbuf *, struct componentname *, fhandle_t *, struct nfs_vattr *, uint64_t *, time_t *, daddr64_t *, int);
void    nfs_name_cache_purge(nfsnode_t, nfsnode_t, struct componentname *, vfs_context_t);

#if CONFIG_NFS4
uint32_t nfs4_ace_nfstype_to_vfstype(uint32_t, int *);
uint32_t nfs4_ace_vfstype_to_nfstype(uint32_t, int *);
uint32_t nfs4_ace_nfsflags_to_vfsflags(uint32_t);
uint32_t nfs4_ace_vfsflags_to_nfsflags(uint32_t);
uint32_t nfs4_ace_nfsmask_to_vfsrights(uint32_t);
uint32_t nfs4_ace_vfsrights_to_nfsmask(uint32_t);
int nfs4_id2guid(char *, guid_t *, int);
int nfs4_guid2id(guid_t *, char *, size_t *, int);

int     nfs4_parsefattr(struct nfsm_chain *, struct nfs_fsattr *, struct nfs_vattr *, fhandle_t *, struct dqblk *, struct nfs_fs_locations *);
#endif

int     nfs_parsefattr(struct nfsmount *nmp, struct nfsm_chain *, int,
    struct nfs_vattr *);
void    nfs_vattr_set_supported(uint32_t *, struct vnode_attr *);
void    nfs_vattr_set_bitmap(struct nfsmount *, uint32_t *, struct vnode_attr *);
void    nfs3_pathconf_cache(struct nfsmount *, struct nfs_fsattr *);
int     nfs3_check_lockmode(struct nfsmount *, struct sockaddr *, int, int);
int     nfs3_mount_rpc(struct nfsmount *, struct sockaddr *, int, int, char *, vfs_context_t, int, fhandle_t *, struct nfs_sec *);
void    nfs3_umount_rpc(struct nfsmount *, vfs_context_t, int);
void    nfs_rdirplus_update_node_attrs(nfsnode_t, struct direntry *, fhandle_t *, struct nfs_vattr *, uint64_t *);
int     nfs_node_access_slot(nfsnode_t, uid_t, int);
void    nfs_vnode_notify(nfsnode_t, uint32_t);

void    nfs_avoid_needless_id_setting_on_create(nfsnode_t, struct vnode_attr *, vfs_context_t);
int     nfs_open_state_set_busy(nfsnode_t, thread_t);
void    nfs_open_state_clear_busy(nfsnode_t);
struct nfs_open_owner *nfs_open_owner_find(struct nfsmount *, kauth_cred_t, int);
void    nfs_open_owner_destroy(struct nfs_open_owner *);
void    nfs_open_owner_ref(struct nfs_open_owner *);
void    nfs_open_owner_rele(struct nfs_open_owner *);
int     nfs_open_owner_set_busy(struct nfs_open_owner *, thread_t);
void    nfs_open_owner_clear_busy(struct nfs_open_owner *);
void    nfs_owner_seqid_increment(struct nfs_open_owner *, struct nfs_lock_owner *, int);
int     nfs_open_file_find(nfsnode_t, struct nfs_open_owner *, struct nfs_open_file **, uint32_t, uint32_t, int);
int     nfs_open_file_find_internal(nfsnode_t, struct nfs_open_owner *, struct nfs_open_file **, uint32_t, uint32_t, int);
void    nfs_open_file_destroy(struct nfs_open_file *);
int     nfs_open_file_set_busy(struct nfs_open_file *, thread_t);
void    nfs_open_file_clear_busy(struct nfs_open_file *);
void    nfs_open_file_add_open(struct nfs_open_file *, uint32_t, uint32_t, int);
void    nfs_open_file_remove_open_find(struct nfs_open_file *, uint32_t, uint32_t, uint8_t *, uint8_t *, int *);
void    nfs_open_file_remove_open(struct nfs_open_file *, uint32_t, uint32_t);
void    nfs_get_stateid(nfsnode_t, thread_t, kauth_cred_t, nfs_stateid *);
int     nfs_check_for_locks(struct nfs_open_owner *, struct nfs_open_file *);
int     nfs_close(nfsnode_t, struct nfs_open_file *, uint32_t, uint32_t, vfs_context_t);

void    nfs_release_open_state_for_node(nfsnode_t, int);
void    nfs_revoke_open_state_for_node(nfsnode_t);
struct nfs_lock_owner *nfs_lock_owner_find(nfsnode_t, proc_t, int);
void    nfs_lock_owner_destroy(struct nfs_lock_owner *);
void    nfs_lock_owner_ref(struct nfs_lock_owner *);
void    nfs_lock_owner_rele(struct nfs_lock_owner *);
int     nfs_lock_owner_set_busy(struct nfs_lock_owner *, thread_t);
void    nfs_lock_owner_clear_busy(struct nfs_lock_owner *);
void    nfs_lock_owner_insert_held_lock(struct nfs_lock_owner *, struct nfs_file_lock *);
struct nfs_file_lock *nfs_file_lock_alloc(struct nfs_lock_owner *);
void    nfs_file_lock_destroy(struct nfs_file_lock *);
int     nfs_file_lock_conflict(struct nfs_file_lock *, struct nfs_file_lock *, int *);
int     nfs_unlock_rpc(nfsnode_t, struct nfs_lock_owner *, int, uint64_t, uint64_t, thread_t, kauth_cred_t, int);
int     nfs_advlock_getlock(nfsnode_t, struct nfs_lock_owner *, struct flock *, uint64_t, uint64_t, vfs_context_t);
int     nfs_advlock_setlock(nfsnode_t, struct nfs_open_file *, struct nfs_lock_owner *, int, uint64_t, uint64_t, int, short, vfs_context_t);
int     nfs_advlock_unlock(nfsnode_t, struct nfs_open_file *, struct nfs_lock_owner *, uint64_t, uint64_t, int, vfs_context_t);

#if CONFIG_NFS4
int     nfs4_create_rpc(vfs_context_t, nfsnode_t, struct componentname *, struct vnode_attr *, int, char *, nfsnode_t *);
int     nfs4_open(nfsnode_t, struct nfs_open_file *, uint32_t, uint32_t, vfs_context_t);
int     nfs4_open_delegated(nfsnode_t, struct nfs_open_file *, uint32_t, uint32_t, vfs_context_t);
int     nfs4_reopen(struct nfs_open_file *, thread_t);
int     nfs4_open_rpc(struct nfs_open_file *, vfs_context_t, struct componentname *, struct vnode_attr *, vnode_t, vnode_t *, int, int, int);
int     nfs4_open_rpc_internal(struct nfs_open_file *, vfs_context_t, thread_t, kauth_cred_t, struct componentname *, struct vnode_attr *, vnode_t, vnode_t *, int, int, int);
int     nfs4_open_confirm_rpc(struct nfsmount *, nfsnode_t, u_char *, int, struct nfs_open_owner *, nfs_stateid *, thread_t, kauth_cred_t, struct nfs_vattr *, uint64_t *);
int     nfs4_open_reopen_rpc(struct nfs_open_file *, thread_t, kauth_cred_t, struct componentname *, vnode_t, vnode_t *, int, int);
int     nfs4_open_reclaim_rpc(struct nfs_open_file *, int, int);
int     nfs4_claim_delegated_open_rpc(struct nfs_open_file *, int, int, int);
int     nfs4_claim_delegated_state_for_open_file(struct nfs_open_file *, int);
int     nfs4_claim_delegated_state_for_node(nfsnode_t, int);
int     nfs4_open_downgrade_rpc(nfsnode_t, struct nfs_open_file *, vfs_context_t);
int     nfs4_close_rpc(nfsnode_t, struct nfs_open_file *, thread_t, kauth_cred_t, int);
void    nfs4_delegation_return_enqueue(nfsnode_t);
int     nfs4_delegation_return(nfsnode_t, int, thread_t, kauth_cred_t);
int     nfs4_lock_rpc(nfsnode_t, struct nfs_open_file *, struct nfs_file_lock *, int, int, thread_t, kauth_cred_t);
int     nfs4_delegreturn_rpc(struct nfsmount *, u_char *, int, struct nfs_stateid *, int, thread_t, kauth_cred_t);

nfsnode_t nfs4_named_attr_dir_get(nfsnode_t, int, vfs_context_t);
int     nfs4_named_attr_get(nfsnode_t, struct componentname *, uint32_t, int, vfs_context_t, nfsnode_t *, struct nfs_open_file **);
int     nfs4_named_attr_remove(nfsnode_t, nfsnode_t, const char *, vfs_context_t);
#endif

int     nfs_mount_state_in_use_start(struct nfsmount *, thread_t);
int     nfs_mount_state_in_use_end(struct nfsmount *, int);
int     nfs_mount_state_error_should_restart(int);
int     nfs_mount_state_error_delegation_lost(int);
uint    nfs_mount_state_max_restarts(struct nfsmount *);
int     nfs_mount_state_wait_for_recovery(struct nfsmount *);
void    nfs_need_recover(struct nfsmount *nmp, int error);
void    nfs_recover(struct nfsmount *);

int     nfs_vnop_access(struct vnop_access_args *);
int     nfs_vnop_remove(struct vnop_remove_args *);
int     nfs_vnop_read(struct vnop_read_args *);
int     nfs_vnop_write(struct vnop_write_args *);
int     nfs_vnop_open(struct vnop_open_args *);
int     nfs_vnop_close(struct vnop_close_args *);
int     nfs_vnop_advlock(struct vnop_advlock_args *);
int     nfs_vnop_mmap(struct vnop_mmap_args *);
int     nfs_vnop_mmap_check(struct vnop_mmap_check_args *ap);
int     nfs_vnop_mnomap(struct vnop_mnomap_args *);

#if CONFIG_NFS4
int     nfs4_vnop_create(struct vnop_create_args *);
int     nfs4_vnop_mknod(struct vnop_mknod_args *);
int     nfs4_vnop_close(struct vnop_close_args *);
int     nfs4_vnop_getattr(struct vnop_getattr_args *);
int     nfs4_vnop_link(struct vnop_link_args *);
int     nfs4_vnop_mkdir(struct vnop_mkdir_args *);
int     nfs4_vnop_rmdir(struct vnop_rmdir_args *);
int     nfs4_vnop_symlink(struct vnop_symlink_args *);
int     nfs4_vnop_getxattr(struct vnop_getxattr_args *);
int     nfs4_vnop_setxattr(struct vnop_setxattr_args *);
int     nfs4_vnop_removexattr(struct vnop_removexattr_args *);
int     nfs4_vnop_listxattr(struct vnop_listxattr_args *);
#if NAMEDSTREAMS
int     nfs4_vnop_getnamedstream(struct vnop_getnamedstream_args *);
int     nfs4_vnop_makenamedstream(struct vnop_makenamedstream_args *);
int     nfs4_vnop_removenamedstream(struct vnop_removenamedstream_args *);
#endif

int     nfs4_access_rpc(nfsnode_t, u_int32_t *, int, vfs_context_t);
int     nfs4_getattr_rpc(nfsnode_t, mount_t, u_char *, size_t, int, vfs_context_t, struct nfs_vattr *, u_int64_t *);
int     nfs4_setattr_rpc(nfsnode_t, struct vnode_attr *, vfs_context_t);
int     nfs4_read_rpc_async(nfsnode_t, off_t, size_t, thread_t, kauth_cred_t, struct nfsreq_cbinfo *, struct nfsreq **);
int     nfs4_read_rpc_async_finish(nfsnode_t, struct nfsreq *, uio_t, size_t *, int *);
int     nfs4_write_rpc_async(nfsnode_t, uio_t, size_t, thread_t, kauth_cred_t, int, struct nfsreq_cbinfo *, struct nfsreq **);
int     nfs4_write_rpc_async_finish(nfsnode_t, struct nfsreq *, int *, size_t *, uint64_t *);
int     nfs4_readdir_rpc(nfsnode_t, struct nfsbuf *, vfs_context_t);
int     nfs4_readlink_rpc(nfsnode_t, char *, size_t *, vfs_context_t);
int     nfs4_commit_rpc(nfsnode_t, uint64_t, uint64_t, kauth_cred_t, uint64_t);
int     nfs4_lookup_rpc_async(nfsnode_t, char *, int, vfs_context_t, struct nfsreq **);
int     nfs4_lookup_rpc_async_finish(nfsnode_t, char *, int, vfs_context_t, struct nfsreq *, u_int64_t *, fhandle_t *, struct nfs_vattr *);
int     nfs4_remove_rpc(nfsnode_t, char *, int, thread_t, kauth_cred_t);
int     nfs4_rename_rpc(nfsnode_t, char *, int, nfsnode_t, char *, int, vfs_context_t);
int     nfs4_pathconf_rpc(nfsnode_t, struct nfs_fsattr *, vfs_context_t);
int     nfs4_setlock_rpc(nfsnode_t, struct nfs_open_file *, struct nfs_file_lock *, int, int, thread_t, kauth_cred_t);
int     nfs4_unlock_rpc(nfsnode_t, struct nfs_lock_owner *, int, uint64_t, uint64_t, int, thread_t, kauth_cred_t);
int     nfs4_getlock_rpc(nfsnode_t, struct nfs_lock_owner *, struct flock *, uint64_t, uint64_t, vfs_context_t);
#endif

int     nfs_read_rpc(nfsnode_t, uio_t, vfs_context_t);
int     nfs_write_rpc(nfsnode_t, uio_t, vfs_context_t, int *, uint64_t *);
int     nfs_write_rpc2(nfsnode_t, uio_t, thread_t, kauth_cred_t, int *, uint64_t *);

int     nfs3_access_rpc(nfsnode_t, u_int32_t *, int, vfs_context_t);
int     nfs3_getattr_rpc(nfsnode_t, mount_t, u_char *, size_t, int, vfs_context_t, struct nfs_vattr *, u_int64_t *);
int     nfs3_setattr_rpc(nfsnode_t, struct vnode_attr *, vfs_context_t);
int     nfs3_read_rpc_async(nfsnode_t, off_t, size_t, thread_t, kauth_cred_t, struct nfsreq_cbinfo *, struct nfsreq **);
int     nfs3_read_rpc_async_finish(nfsnode_t, struct nfsreq *, uio_t, size_t *, int *);
int     nfs3_write_rpc_async(nfsnode_t, uio_t, size_t, thread_t, kauth_cred_t, int, struct nfsreq_cbinfo *, struct nfsreq **);
int     nfs3_write_rpc_async_finish(nfsnode_t, struct nfsreq *, int *, size_t *, uint64_t *);
int     nfs3_readdir_rpc(nfsnode_t, struct nfsbuf *, vfs_context_t);
int     nfs3_readlink_rpc(nfsnode_t, char *, size_t *, vfs_context_t);
int     nfs3_commit_rpc(nfsnode_t, uint64_t, uint64_t, kauth_cred_t, uint64_t);
int     nfs3_lookup_rpc_async(nfsnode_t, char *, int, vfs_context_t, struct nfsreq **);
int     nfs3_lookup_rpc_async_finish(nfsnode_t, char *, int, vfs_context_t, struct nfsreq *, u_int64_t *, fhandle_t *, struct nfs_vattr *);
int     nfs3_remove_rpc(nfsnode_t, char *, int, thread_t, kauth_cred_t);
int     nfs3_rename_rpc(nfsnode_t, char *, int, nfsnode_t, char *, int, vfs_context_t);
int     nfs3_pathconf_rpc(nfsnode_t, struct nfs_fsattr *, vfs_context_t);
int     nfs3_setlock_rpc(nfsnode_t, struct nfs_open_file *, struct nfs_file_lock *, int, int, thread_t, kauth_cred_t);
int     nfs3_unlock_rpc(nfsnode_t, struct nfs_lock_owner *, int, uint64_t, uint64_t, int, thread_t, kauth_cred_t);
int     nfs3_getlock_rpc(nfsnode_t, struct nfs_lock_owner *, struct flock *, uint64_t, uint64_t, vfs_context_t);

void    nfsrv_active_user_list_reclaim(void);
void    nfsrv_cleancache(void);
void    nfsrv_cleanup(void);
int     nfsrv_credcheck(struct nfsrv_descript *, vfs_context_t, struct nfs_export *,
    struct nfs_export_options *);
void    nfsrv_idlesock_timer(void *, void *);
int     nfsrv_dorec(struct nfsrv_sock *, struct nfsd *, struct nfsrv_descript **);
int     nfsrv_errmap(struct nfsrv_descript *, int);
int     nfsrv_export(struct user_nfs_export_args *, vfs_context_t);
int     nfsrv_fhmatch(struct nfs_filehandle *, struct nfs_filehandle *);
int     nfsrv_fhtovp(struct nfs_filehandle *, struct nfsrv_descript *, vnode_t *,
    struct nfs_export **, struct nfs_export_options **);
int     nfsrv_check_exports_allow_address(mbuf_t);
#if CONFIG_FSE
void    nfsrv_fmod_timer(void *, void *);
#endif
int     nfsrv_getcache(struct nfsrv_descript *, struct nfsrv_sock *, mbuf_t *);
void    nfsrv_group_sort(gid_t *, int);
void    nfsrv_init(void);
void    nfsrv_initcache(void);
int     nfsrv_is_initialized(void);
int     nfsrv_namei(struct nfsrv_descript *, vfs_context_t, struct nameidata *,
    struct nfs_filehandle *, vnode_t *,
    struct nfs_export **, struct nfs_export_options **);
void    nfsrv_rcv(socket_t, void *, int);
void    nfsrv_rcv_locked(socket_t, struct nfsrv_sock *, int);
int     nfsrv_rephead(struct nfsrv_descript *, struct nfsrv_sock *, struct nfsm_chain *, size_t);
int     nfsrv_send(struct nfsrv_sock *, mbuf_t, mbuf_t);
void    nfsrv_updatecache(struct nfsrv_descript *, int, mbuf_t);
void    nfsrv_update_user_stat(struct nfs_export *, struct nfsrv_descript *, uid_t, u_int, u_int, u_int);
int     nfsrv_vptofh(struct nfs_export *, int, struct nfs_filehandle *,
    vnode_t, vfs_context_t, struct nfs_filehandle *);
void    nfsrv_wakenfsd(struct nfsrv_sock *);
void    nfsrv_wg_timer(void *, void *);
int     nfsrv_writegather(struct nfsrv_descript **, struct nfsrv_sock *,
    vfs_context_t, mbuf_t *);

int     nfsrv_access(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_commit(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_create(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_fsinfo(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_getattr(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_link(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_lookup(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_mkdir(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_mknod(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_noop(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_null(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_pathconf(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_read(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_readdir(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_readdirplus(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_readlink(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_remove(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_rename(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_rmdir(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_setattr(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_statfs(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_symlink(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);
int     nfsrv_write(struct nfsrv_descript *, struct nfsrv_sock *, vfs_context_t, mbuf_t *);

void    nfs_interval_timer_start(thread_call_t, time_t);
int     nfs_use_cache(struct nfsmount *);
void    nfs_up(struct nfsmount *, thread_t, int, const char *);
void    nfs_down(struct nfsmount *, thread_t, int, int, const char *, int);
int     nfs_msg(thread_t, const char *, const char *, int);

int     nfs_mountroot(void);
struct nfs_diskless;
int     nfs_boot_init(struct nfs_diskless *);
int     nfs_boot_getfh(struct nfs_diskless *, int, int);

#if CONFIG_TRIGGERS
resolver_result_t nfs_mirror_mount_trigger_resolve(vnode_t, const struct componentname *, enum path_operation, int, void *, vfs_context_t);
resolver_result_t nfs_mirror_mount_trigger_unresolve(vnode_t, int, void *, vfs_context_t);
resolver_result_t nfs_mirror_mount_trigger_rearm(vnode_t, int, void *, vfs_context_t);
int     nfs_mirror_mount_domount(vnode_t, vnode_t, vfs_context_t);
void    nfs_ephemeral_mount_harvester_start(void);
void    nfs_ephemeral_mount_harvester(__unused void *arg, __unused wait_result_t wr);
#endif

/* socket upcall interfaces */
void nfsrv_uc_init(void);
void nfsrv_uc_cleanup(void);
void nfsrv_uc_addsock(struct nfsrv_sock *, int);
void nfsrv_uc_dequeue(struct nfsrv_sock *);

/* Debug support */
#define NFS_DEBUG_LEVEL   (nfs_debug_ctl & 0xf)
#define NFS_DEBUG_FACILITY ((nfs_debug_ctl >> 4) & 0xfff)
#define NFS_DEBUG_FLAGS ((nfs_debug_ctl >> 16) & 0xf)
#define NFS_DEBUG_VALUE ((nfs_debug_ctl >> 20) & 0xfff)
#define NFS_FAC_SOCK    0x001
#define NFS_FAC_STATE   0x002
#define NFS_FAC_NODE    0x004
#define NFS_FAC_VNOP    0x008
#define NFS_FAC_BIO     0x010
#define NFS_FAC_GSS     0x020
#define NFS_FAC_VFS     0x040
#define NFS_FAC_SRV     0x080

#define NFS_IS_DBG(fac, lev) \
	(__builtin_expect((NFS_DEBUG_FACILITY & (fac)) && ((lev) <= NFS_DEBUG_LEVEL), 0))
#define NFS_DBG(fac, lev, fmt, ...)  nfs_printf((fac), (lev), "%s: %d: " fmt, __func__, __LINE__, ## __VA_ARGS__)

void nfs_printf(unsigned int, unsigned int, const char *, ...) __printflike(3, 4);
void nfs_dump_mbuf(const char *, int, const char *, mbuf_t);
int  nfs_mountopts(struct nfsmount *, char *, int);

#if XNU_KERNEL_PRIVATE
#include <kern/kalloc.h>

ZONE_VIEW_DECLARE(ZV_NFSDIROFF);
extern zone_t nfs_buf_zone;
extern zone_t nfsrv_descript_zone;
extern zone_t nfsnode_zone;
extern zone_t nfs_fhandle_zone;
extern zone_t nfs_req_zone;
extern zone_t nfsrv_descript_zone;
extern zone_t nfsmnt_zone;

#endif /* XNU_KERNEL_PRIVATE */
__END_DECLS

#endif  /* KERNEL */
#endif /* __APPLE_API_PRIVATE */

#endif
