/*	$OpenBSD: nfs.h,v 1.54 2024/05/04 10:53:37 jsg Exp $	*/
/*	$NetBSD: nfs.h,v 1.10.4.1 1996/05/27 11:23:56 fvdl Exp $	*/

/*
 * 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. 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
 */

#ifndef _NFS_NFS_H_
#define _NFS_NFS_H_

#define NFS_TICKINTVL	5		/* Desired time for a tick (msec) */
#define NFS_HZ		(hz / nfs_ticks) /* Ticks/sec */
#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_TIMEOUTMUL	2		/* Timeout/Delay multiplier */
#define	NFS_MAXREXMIT	100		/* Stop counting after this many */
#define	NFS_RETRANS	10		/* Num of retrans for soft mounts */
#define	NFS_MAXGRPS	16		/* Max. size of groups list */
#define	NFS_MINATTRTIMO 5		/* Attribute cache timeout in sec */
#define	NFS_MAXATTRTIMO 60
#define	NFS_WSIZE	8192		/* Def. write data size <= 8192 */
#define	NFS_RSIZE	8192		/* Def. read data size <= 8192 */
#define NFS_READDIRSIZE	8192		/* Def. readdir size */
#define	NFS_DEFRAHEAD	1		/* Def. read ahead # blocks */
#define	NFS_MAXRAHEAD	4		/* Max. read ahead # blocks */
#define	NFS_MAXASYNCDAEMON 	20	/* Max. number async_daemons runable */

/*
 * Ideally, NFS_DIRBLKSIZ should be bigger, but I've seen servers with
 * broken NFS/ethernet drivers that won't work with anything bigger (Linux..)
 */
#define	NFS_DIRBLKSIZ	1024		/* Must be a multiple of DIRBLKSIZ */
#define NFS_READDIRBLKSIZ	512	/* Size of read dir blocks. XXX */

/*
 * Oddballs
 */
#define NFS_CMPFH(n, f, s) \
	((n)->n_fhsize == (s) && !bcmp((caddr_t)(n)->n_fhp, (caddr_t)(f), (s)))
#define NFS_ISV3(v)	(VFSTONFS((v)->v_mount)->nm_flag & NFSMNT_NFSV3)
#define NFS_SRVMAXDATA(n) \
		(((n)->nd_flag & ND_NFSV3) ? (((n)->nd_nam2) ? \
		 NFS_MAXDGRAMDATA : NFS_MAXDATA) : NFS_V2MAXDATA)

/*
 * The B_INVAFTERWRITE flag should be set to whatever is required by the
 * buffer cache code to say "Invalidate the block after it is written back".
 */
#define	B_INVAFTERWRITE	B_INVAL

/*
 * Structures for the nfssvc(2) syscall.
 * Not that anyone besides nfsd(8) should ever use it.
 */
struct nfsd_args {
	int	sock;		/* Socket to serve */
	caddr_t	name;		/* Client addr for connection based sockets */
	int	namelen;	/* Length of name */
};

struct nfsd_srvargs {
	struct nfsd	*nsd_nfsd;	/* Pointer to in kernel nfsd struct */
	uid_t		nsd_uid;	/* Effective uid mapped to cred */
	u_int32_t	nsd_haddr;	/* IP address of client */
	struct xucred	nsd_cr;		/* Cred. uid maps to */
	int		nsd_authlen;	/* Length of auth string (ret) */
	u_char		*nsd_authstr;	/* Auth string (ret) */
	int		nsd_verflen;	/* and the verifier */
	u_char		*nsd_verfstr;
	struct timeval	nsd_timestamp;	/* timestamp from verifier */
	u_int32_t	nsd_ttl;	/* credential ttl (sec) */
};

/*
 * 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	forcedsync;
	uint64_t	srvnqnfs_leases;
	uint64_t	srvnqnfs_maxleases;
	uint64_t	srvnqnfs_getleases;
	uint64_t	srvvop_writes;
};

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

/*
 * fs.nfs sysctl(3) identifiers
 */
#define	NFS_NFSSTATS	1	/* struct: struct nfsstats */
#define	NFS_NIOTHREADS	2	/* number of i/o threads */
#define	NFS_MAXID	3

#define FS_NFS_NAMES { \
			{ 0, 0 }, \
			{ "nfsstats", CTLTYPE_STRUCT }, \
			{ "iothreads", CTLTYPE_INT } \
}

/*
 * 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.
 */
#ifdef _KERNEL
extern int nfs_niothreads;

struct uio; struct buf; struct vattr; struct nameidata;	/* XXX */

#define	NFSINT_SIGMASK	(sigmask(SIGINT)|sigmask(SIGTERM)|sigmask(SIGKILL)| \
			 sigmask(SIGHUP)|sigmask(SIGQUIT))

/*
 * Socket errors ignored for connectionless sockets??
 * For now, ignore them all
 */
#define	NFSIGNORE_SOERROR(s, e) \
		((e) != EINTR && (e) != ERESTART && (e) != EWOULDBLOCK && \
		((s) & PR_CONNREQUIRED) == 0)

/*
 * Nfs outstanding request list element
 */
struct nfsreq {
	TAILQ_ENTRY(nfsreq) r_chain;
	struct mbuf	*r_mreq;
	struct mbuf	*r_mrep;
	struct mbuf	*r_md;
	caddr_t		r_dpos;
	struct nfsmount *r_nmp;
	struct vnode	*r_vp;
	u_int32_t	r_xid;
	int		r_flags;	/* flags on request, see below */
	int		r_rexmit;	/* current retrans count */
	int		r_timer;	/* tick counter on reply */
	int		r_procnum;	/* NFS procedure number */
	int		r_rtt;		/* RTT for rpc */
	struct proc	*r_procp;	/* Proc that did I/O system call */
};

/* Flag values for r_flags */
#define R_TIMING	0x01		/* timing request (in mntp) */
#define R_SENT		0x02		/* request has been sent */
#define	R_SOFTTERM	0x04		/* soft mnt, too many retries */
#define	R_INTR		0x08		/* intr mnt, signal pending */
#define	R_SOCKERR	0x10		/* Fatal error on socket */
#define	R_TPRINTFMSG	0x20		/* Did a tprintf msg. */
#define	R_MUSTRESEND	0x40		/* Must resend request */

/*
 * On fast networks, the estimator will try to reduce the
 * timeout lower than the latency of the server's disks,
 * which results in too many timeouts, so cap the lower
 * bound.
 */
#define NFS_MINRTO	(NFS_HZ >> 2)

/*
 * Keep the RTO from increasing to unreasonably large values
 * when a server is not responding.
 */
#define NFS_MAXRTO	(20 * NFS_HZ)

enum nfs_rto_timers {
	NFS_DEFAULT_TIMER,
	NFS_GETATTR_TIMER,
	NFS_LOOKUP_TIMER,
	NFS_READ_TIMER,
	NFS_WRITE_TIMER,
};
#define NFS_MAX_TIMER	(NFS_WRITE_TIMER)

#define NFS_INITRTT	(NFS_HZ << 3)

/*
 * Network address hash list element
 */
union nethostaddr {
	u_int32_t had_inetaddr;
	struct mbuf *had_nam;
};

struct nfssvc_sock {
	TAILQ_ENTRY(nfssvc_sock) ns_chain; /* List of all nfssvc_sock's */
	struct file	*ns_fp;		/* fp from the... */
	struct socket	*ns_so;		/* ...socket this struct wraps */
	struct mbuf	*ns_nam;	/* MT_SONAME of client */
	struct mbuf	*ns_raw;	/* head of unpeeked mbufs */
	struct mbuf	*ns_rawend;	/* tail of unpeeked mbufs */
	struct mbuf	*ns_rec;	/* queued RPC records */
	struct mbuf	*ns_recend;	/* last queued RPC record */
	struct mbuf	*ns_frag;	/* end of record fragment */
	int		ns_flag;	/* socket status flags */
	int		ns_solock;	/* lock for connected socket */
	int		ns_cc;		/* actual chars queued */
	int		ns_reclen;	/* length of first queued record */
	u_int32_t	ns_sref;	/* # of refs to this struct */
};

/* Bits for "ns_flag" */
#define	SLP_VALID	0x01	/* connection is usable */
#define	SLP_DOREC	0x02	/* receive operation required */
#define	SLP_NEEDQ	0x04	/* connection has data to queue from socket */
#define	SLP_DISCONN	0x08	/* connection is closed */
#define	SLP_GETSTREAM	0x10	/* extracting RPC from TCP connection */
#define	SLP_LASTFRAG	0x20	/* last fragment received on TCP connection */
#define	SLP_ALLFLAGS	0xff	/* convenience */

/*
 * One of these structures is allocated for each nfsd.
 */
struct nfsd {
	TAILQ_ENTRY(nfsd) nfsd_chain;	/* List of all nfsd's */
	int		nfsd_flag;	/* NFSD_ flags */
	struct nfssvc_sock *nfsd_slp;	/* Current socket */
	struct proc	*nfsd_procp;	/* Proc ptr */
	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.
 */
struct nfsrv_descript {
	struct mbuf		*nd_mrep;	/* Request mbuf list */
	struct mbuf		*nd_md;		/* Current dissect mbuf */
	struct mbuf		*nd_nam;	/* and socket addr */
	struct mbuf		*nd_nam2;	/* return socket addr */
	caddr_t			nd_dpos;	/* Current dissect pos */
	unsigned int		nd_procnum;	/* RPC # */
	int			nd_flag;	/* nd_flag */
	int			nd_repstat;	/* Reply status */
	u_int32_t		nd_retxid;	/* Reply xid */
	struct ucred		nd_cr;		/* Credentials */
};

/* Bits for "nd_flag" */
#define ND_NFSV3	0x08

extern struct pool nfsreqpl;
extern struct pool nfs_node_pool;
extern TAILQ_HEAD(nfsdhead, nfsd) nfsd_head;
extern int nfsd_head_flag;
#define	NFSD_CHECKSLP	0x01

#endif	/* _KERNEL */
#endif /* _NFS_NFS_H */