/* $NetBSD: nfsrvstate.h,v 1.3 2024/09/08 09:36:51 rillig Exp $ */
/*-
* Copyright (c) 2009 Rick Macklem, University of Guelph
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* FreeBSD: head/sys/fs/nfs/nfsrvstate.h 298788 2016-04-29 16:07:25Z pfg
* $NetBSD: nfsrvstate.h,v 1.3 2024/09/08 09:36:51 rillig Exp $
*/
/*
* Definitions for NFS V4 server state handling.
*/
/*
* List heads for nfsclient, nfsstate and nfslockfile.
* (Some systems seem to like to dynamically size these things, but I
* don't see any point in doing so for these ones.)
*/
LIST_HEAD(nfsclienthashhead, nfsclient);
LIST_HEAD(nfsstatehead, nfsstate);
LIST_HEAD(nfslockhead, nfslock);
LIST_HEAD(nfslockhashhead, nfslockfile);
LIST_HEAD(nfssessionhead, nfsdsession);
LIST_HEAD(nfssessionhashhead, nfsdsession);
/*
* List head for nfsusrgrp.
*/
TAILQ_HEAD(nfsuserhashhead, nfsusrgrp);
/*
* Client server structure for V4. It is doubly linked into two lists.
* The first is a hash table based on the clientid and the second is a
* list of all clients maintained in LRU order.
* The actual size malloc'd is large enough to accommodate the id string.
*/
struct nfsclient {
LIST_ENTRY(nfsclient) lc_hash; /* Clientid hash list */
struct nfsstatehead *lc_stateid; /* Stateid hash */
struct nfsstatehead lc_open; /* Open owner list */
struct nfsstatehead lc_deleg; /* Delegations */
struct nfsstatehead lc_olddeleg; /* and old delegations */
struct nfssessionhead lc_session; /* List of NFSv4.1 sessions */
time_t lc_expiry; /* Expiry time (sec) */
time_t lc_delegtime; /* Old deleg expiry (sec) */
nfsquad_t lc_clientid; /* 64 bit clientid */
nfsquad_t lc_confirm; /* 64 bit confirm value */
u_int32_t lc_program; /* RPC Program # */
u_int32_t lc_callback; /* Callback id */
u_int32_t lc_stateindex; /* Current state index# */
u_int32_t lc_statemaxindex; /* Max state index# */
u_int32_t lc_cbref; /* Cnt of callbacks */
uid_t lc_uid; /* User credential */
gid_t lc_gid;
u_int16_t lc_idlen; /* Client ID and len */
u_int16_t lc_namelen; /* plus GSS principal and len */
u_char *lc_name;
struct nfssockreq lc_req; /* Callback info */
u_int32_t lc_flags; /* LCL_ flag bits */
u_char lc_verf[NFSX_VERF]; /* client verifier */
u_char lc_id[1]; /* Malloc'd correct size */
};
/*
* Structure for an NFSv4.1 session.
* Locking rules for this structure.
* To add/delete one of these structures from the lists, you must lock
* both: NFSLOCKSTATE() and NFSLOCKSESSION(session hashhead) in that order.
* To traverse the lists looking for one of these, you must hold one
* of these two locks.
* The exception is if the thread holds the exclusive root sleep lock.
* In this case, all other nfsd threads are blocked, so locking the
* mutexes isn't required.
* When manipulating sess_refcnt, NFSLOCKSTATE() must be locked.
* When manipulating the fields withinsess_cbsess except nfsess_xprt,
* sess_cbsess.nfsess_mtx must be locked.
* When manipulating sess_slots and sess_cbsess.nfsess_xprt,
* NFSLOCKSESSION(session hashhead) must be locked.
*/
struct nfsdsession {
uint64_t sess_refcnt; /* Reference count. */
LIST_ENTRY(nfsdsession) sess_hash; /* Hash list of sessions. */
LIST_ENTRY(nfsdsession) sess_list; /* List of client sessions. */
struct nfsslot sess_slots[NFSV4_SLOTS];
struct nfsclient *sess_clp; /* Associated clientid. */
uint32_t sess_crflags;
uint32_t sess_cbprogram;
uint32_t sess_maxreq;
uint32_t sess_maxresp;
uint32_t sess_maxrespcached;
uint32_t sess_maxops;
uint32_t sess_maxslots;
uint32_t sess_cbmaxreq;
uint32_t sess_cbmaxresp;
uint32_t sess_cbmaxrespcached;
uint32_t sess_cbmaxops;
uint8_t sess_sessionid[NFSX_V4SESSIONID];
struct nfsclsession sess_cbsess; /* Callback session. */
};
/*
* Nfs state structure. I couldn't resist overloading this one, since
* it makes cleanup, etc. simpler. These structures are used in four ways:
* - open_owner structures chained off of nfsclient
* - open file structures chained off an open_owner structure
* - lock_owner structures chained off an open file structure
* - delegated file structures chained off of nfsclient and nfslockfile
* - the ls_list field is used for the chain it is in
* - the ls_head structure is used to chain off the sibling structure
* (it is a union between an nfsstate and nfslock structure head)
* If it is a lockowner stateid, nfslock structures hang off it.
* For the open file and lockowner cases, it is in the hash table in
* nfsclient for stateid.
*/
struct nfsstate {
LIST_ENTRY(nfsstate) ls_hash; /* Hash list entry */
LIST_ENTRY(nfsstate) ls_list; /* List of opens/delegs */
LIST_ENTRY(nfsstate) ls_file; /* Opens/Delegs for a file */
union {
struct nfsstatehead open; /* Opens list */
struct nfslockhead lock; /* Locks list */
} ls_head;
nfsv4stateid_t ls_stateid; /* The state id */
u_int32_t ls_seq; /* seq id */
uid_t ls_uid; /* uid of locker */
u_int32_t ls_flags; /* Type of lock, etc. */
union {
struct nfsstate *openowner; /* Open only */
u_int32_t opentolockseq; /* Lock call only */
u_int32_t noopens; /* Openowner only */
struct {
u_quad_t filerev; /* Delegations only */
time_t expiry;
time_t limit;
u_int64_t compref;
} deleg;
} ls_un;
struct nfslockfile *ls_lfp; /* Back pointer */
struct nfsrvcache *ls_op; /* Op cache reference */
struct nfsclient *ls_clp; /* Back pointer */
u_short ls_ownerlen; /* Length of ls_owner */
u_char ls_owner[1]; /* malloc'd the correct size */
};
#define ls_lock ls_head.lock
#define ls_open ls_head.open
#define ls_opentolockseq ls_un.opentolockseq
#define ls_openowner ls_un.openowner
#define ls_openstp ls_un.openowner
#define ls_noopens ls_un.noopens
#define ls_filerev ls_un.deleg.filerev
#define ls_delegtime ls_un.deleg.expiry
#define ls_delegtimelimit ls_un.deleg.limit
#define ls_compref ls_un.deleg.compref
/*
* Nfs lock structure.
* This structure is chained off of the nfsstate (the lockowner) and
* nfslockfile (the file) structures, for the file and owner it
* refers to. It holds flags and a byte range.
* It also has back pointers to the associated lock_owner and lockfile.
*/
struct nfslock {
LIST_ENTRY(nfslock) lo_lckowner;
LIST_ENTRY(nfslock) lo_lckfile;
struct nfsstate *lo_stp;
struct nfslockfile *lo_lfp;
u_int64_t lo_first;
u_int64_t lo_end;
u_int32_t lo_flags;
};
/*
* Structure used to return a conflicting lock. (Must be large
* enough for the largest lock owner we can have.)
*/
struct nfslockconflict {
nfsquad_t cl_clientid;
u_int64_t cl_first;
u_int64_t cl_end;
u_int32_t cl_flags;
u_short cl_ownerlen;
u_char cl_owner[NFSV4_OPAQUELIMIT];
};
/*
* This structure is used to keep track of local locks that might need
* to be rolled back.
*/
struct nfsrollback {
LIST_ENTRY(nfsrollback) rlck_list;
uint64_t rlck_first;
uint64_t rlck_end;
int rlck_type;
};
/*
* This structure refers to a file for which lock(s) and/or open(s) exist.
* Searched via hash table on file handle or found via the back pointer from an
* open or lock owner.
*/
struct nfslockfile {
LIST_HEAD(, nfsstate) lf_open; /* Open list */
LIST_HEAD(, nfsstate) lf_deleg; /* Delegation list */
LIST_HEAD(, nfslock) lf_lock; /* Lock list */
LIST_HEAD(, nfslock) lf_locallock; /* Local lock list */
LIST_HEAD(, nfsrollback) lf_rollback; /* Local lock rollback list */
LIST_ENTRY(nfslockfile) lf_hash; /* Hash list entry */
fhandle_t lf_fh; /* The file handle */
struct nfsv4lock lf_locallock_lck; /* serialize local locking */
int lf_usecount; /* Ref count for locking */
};
/*
* This structure is malloc'd and chained off hash lists for user/group
* names.
*/
struct nfsusrgrp {
TAILQ_ENTRY(nfsusrgrp) lug_numhash; /* Hash by id# */
TAILQ_ENTRY(nfsusrgrp) lug_namehash; /* and by name */
time_t lug_expiry; /* Expiry time in sec */
union {
uid_t un_uid; /* id# */
gid_t un_gid;
} lug_un;
struct ucred *lug_cred; /* Cred. with groups list */
int lug_namelen; /* Name length */
u_char lug_name[1]; /* malloc'd correct length */
};
#define lug_uid lug_un.un_uid
#define lug_gid lug_un.un_gid
/*
* These structures are used for the stable storage restart stuff.
*/
/*
* Record at beginning of file.
*/
struct nfsf_rec {
u_int32_t lease; /* Lease duration */
u_int32_t numboots; /* Number of boottimes */
};
