FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/nfs.h

     /*-
      * 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.
     * 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: releng/6.4/sys/nfsclient/nfs.h 159057 2006-05-30 01:52:59Z cel $
     */
    
    #ifndef _NFSCLIENT_NFS_H_
    #define _NFSCLIENT_NFS_H_
    
    #ifdef _KERNEL
    #include "opt_nfs.h"
    #endif
    
    #include <nfsclient/nfsargs.h>
    
    /*
     * Tunable constants for nfs
     */
    
    #define NFS_TICKINTVL   10              /* 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_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 UDP soft mounts */
    #define NFS_RETRANS_TCP 2               /* Num of retrans for TCP soft mounts */
    #define NFS_MAXGRPS     16              /* Max. size of groups list */
    #ifndef NFS_MINATTRTIMO
    #define NFS_MINATTRTIMO 3               /* VREG attrib cache timeout in sec */
    #endif
    #ifndef NFS_MAXATTRTIMO
    #define NFS_MAXATTRTIMO 60
    #endif
    #ifndef NFS_MINDIRATTRTIMO
    #define NFS_MINDIRATTRTIMO 30           /* VDIR attrib cache timeout in sec */
    #endif
    #ifndef NFS_MAXDIRATTRTIMO
    #define NFS_MAXDIRATTRTIMO 60
    #endif
    #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      64      /* Max. number async_daemons runnable */
    #define NFS_DIRBLKSIZ   4096            /* Must be a multiple of DIRBLKSIZ */
    #ifdef _KERNEL
    #define DIRBLKSIZ       512             /* XXX we used to use ufs's DIRBLKSIZ */
    #endif
    #define NFS_MAXDEADTHRESH       9       /* How long till we say 'server not responding' */
    
    /*
     * 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 NFSSTA_HASWRITEVERF     0x00040000  /* Has write verifier for V3 */
    #define NFSSTA_GOTFSINFO        0x00100000  /* Got the V3 fsinfo */
    #define NFSSTA_SNDLOCK          0x01000000  /* Send socket lock */
    #define NFSSTA_WANTSND          0x02000000  /* Want above */
    #define NFSSTA_TIMEO            0x10000000  /* Experiencing a timeout */
    
    
    /*
     * XXX to allow amd to include nfs.h without nfsproto.h
     */
   #ifdef NFS_NPROCS
   #include <nfsclient/nfsstats.h>
   #endif
   
   /*
    * vfs.nfs sysctl(3) identifiers
    */
   #define NFS_NFSSTATS    1               /* struct: struct nfsstats */
   
   /*
    * File context information for nfsv4.  Currently, there is only one
    * lockowner for the whole machine "0."
    */
   struct nfs4_fctx {
           TAILQ_ENTRY(nfs4_fstate) next;
           uint32_t        refcnt;
           struct nfs4_lowner *lop;
           struct nfsnode *np;
           char            stateid[NFSX_V4STATEID];
   };
   
   #ifdef _KERNEL
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_NFSREQ);
   MALLOC_DECLARE(M_NFSDIROFF);
   MALLOC_DECLARE(M_NFSBIGFH);
   MALLOC_DECLARE(M_NFSHASH);
   MALLOC_DECLARE(M_NFSDIRECTIO);
   #endif
   
   extern struct uma_zone *nfsmount_zone;
   
   extern struct callout nfs_callout;
   extern struct nfsstats nfsstats;
   
   extern int nfs_numasync;
   extern unsigned int nfs_iodmax;
   extern int nfs_pbuf_freecnt;
   extern int nfs_ticks;
   
   /* Data constants in XDR form */
   extern u_int32_t nfs_true, nfs_false, nfs_xdrneg1;
   extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers;
   extern u_int32_t rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr;
   
   extern int nfsv3_procid[NFS_NPROCS];
   
   struct uio;
   struct buf;
   struct vattr;
   struct nameidata;
   
   /*
    * Socket errors ignored for connectionless sockets??
    * For now, ignore them all
    */
   #define NFSIGNORE_SOERROR(s, e) \
                   ((e) != EINTR && (e) != EIO && \
                    (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_retry;        /* max retransmission count */
           int             r_rexmit;       /* current retrans count */
           int             r_timer;        /* tick counter on reply */
           u_int32_t       r_procnum;      /* NFS procedure number */
           int             r_rtt;          /* RTT for rpc */
           int             r_lastmsg;      /* last tprintf */
           struct thread   *r_td;          /* Proc that did I/O system call */
   };
   
   /*
    * Queue head for nfsreq's
    */
   extern TAILQ_HEAD(nfs_reqq, nfsreq) nfs_reqq;
   
   /* 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_RESENDERR     0x08            /* Resend failed */
   #define R_SOCKERR       0x10            /* Fatal error on socket */
   #define R_TPRINTFMSG    0x20            /* Did a tprintf msg. */
   #define R_MUSTRESEND    0x40            /* Must resend request */
   #define R_GETONEREP     0x80            /* Probe for one reply only */
   
   /*
    * Pointers to ops that differ from v3 to v4
    */
   struct nfs_rpcops {
           int     (*nr_readrpc)(struct vnode *vp, struct uio *uiop, struct ucred *cred);
           int     (*nr_writerpc)(struct vnode *vp, struct uio *uiop, struct ucred *cred,
                                  int *iomode, int *must_commit);
           int     (*nr_writebp)(struct buf *bp, int force, struct thread *td);
           int     (*nr_readlinkrpc)(struct vnode *vp, struct uio *uiop, struct ucred *cred);
           void    (*nr_invaldir)(struct vnode *vp);
           int     (*nr_commit)(struct vnode *vp, u_quad_t offset, int cnt,
                                struct ucred *cred, struct thread *td);
   };
   
   /*
    * Defines for WebNFS
    */
   
   #define WEBNFS_ESC_CHAR         '%'
   #define WEBNFS_SPECCHAR_START   0x80
   
   #define WEBNFS_NATIVE_CHAR      0x80
   /*
    * ..
    * Possibly more here in the future.
    */
   
   /*
    * Macro for converting escape characters in WebNFS pathnames.
    * Should really be in libkern.
    */
   
   #define HEXTOC(c) \
           ((c) >= 'a' ? ((c) - ('a' - 10)) : \
               ((c) >= 'A' ? ((c) - ('A' - 10)) : ((c) - '')))
   #define HEXSTRTOI(p) \
           ((HEXTOC(p[0]) << 4) + HEXTOC(p[1]))
   
   /* nfs_sigintr() helper, when 'rep' has all we need */
   #define NFS_SIGREP(rep)         nfs_sigintr((rep)->r_nmp, (rep), (rep)->r_td)
   
   #ifdef NFS_DEBUG
   
   extern int nfs_debug;
   #define NFS_DEBUG_ASYNCIO       1 /* asynchronous i/o */
   #define NFS_DEBUG_WG            2 /* server write gathering */
   #define NFS_DEBUG_RC            4 /* server request caching */
   
   #define NFS_DPF(cat, args)                                      \
           do {                                                    \
                   if (nfs_debug & NFS_DEBUG_##cat) printf args;   \
           } while (0)
   
   #else
   
   #define NFS_DPF(cat, args)
   
   #endif
   
   /*
    * 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_timer_t {
           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)
   
   vfs_init_t nfs_init;
   vfs_uninit_t nfs_uninit;
   int     nfs_mountroot(struct mount *mp, struct thread *td);
   
   #ifndef NFS4_USE_RPCCLNT
   int     nfs_send(struct socket *, struct sockaddr *, struct mbuf *,
               struct nfsreq *);
   int     nfs_sndlock(struct nfsreq *);
   void    nfs_sndunlock(struct nfsreq *);
   #endif /* ! NFS4_USE_RPCCLNT */
   
   int     nfs_vinvalbuf(struct vnode *, int, struct thread *, int);
   int     nfs_readrpc(struct vnode *, struct uio *, struct ucred *);
   int     nfs_writerpc(struct vnode *, struct uio *, struct ucred *, int *,
               int *);
   int     nfs_commit(struct vnode *vp, u_quad_t offset, int cnt,
               struct ucred *cred, struct thread *td);
   int     nfs_readdirrpc(struct vnode *, struct uio *, struct ucred *);
   int     nfs_nfsiodnew(void);
   int     nfs_asyncio(struct nfsmount *, struct buf *, struct ucred *, struct thread *);
   int     nfs_doio(struct vnode *, struct buf *, struct ucred *, struct thread *);
   void    nfs_doio_directwrite (struct buf *);
   void    nfs_up(struct nfsreq *, struct nfsmount *, struct thread *,
               const char *, int);
   void    nfs_down(struct nfsreq *, struct nfsmount *, struct thread *,
               const char *, int, int);
   int     nfs_readlinkrpc(struct vnode *, struct uio *, struct ucred *);
   int     nfs_sigintr(struct nfsmount *, struct nfsreq *, struct thread *);
   int     nfs_readdirplusrpc(struct vnode *, struct uio *, struct ucred *);
   int     nfs_request(struct vnode *, struct mbuf *, int, struct thread *,
               struct ucred *, struct mbuf **, struct mbuf **, caddr_t *);
   int     nfs_loadattrcache(struct vnode **, struct mbuf **, caddr_t *,
               struct vattr *, int);
   int     nfsm_mbuftouio(struct mbuf **, struct uio *, int, caddr_t *);
   void    nfs_nhinit(void);
   void    nfs_nhuninit(void);
   int     nfs_nmcancelreqs(struct nfsmount *);
   void    nfs_timer(void*);
   
   int     nfs_connect(struct nfsmount *, struct nfsreq *);
   void    nfs_disconnect(struct nfsmount *);
   void    nfs_safedisconnect(struct nfsmount *);
   int     nfs_getattrcache(struct vnode *, struct vattr *);
   int     nfsm_strtmbuf(struct mbuf **, char **, const char *, long);
   int     nfs_bioread(struct vnode *, struct uio *, int, struct ucred *);
   int     nfsm_uiotombuf(struct uio *, struct mbuf **, int, caddr_t *);
   void    nfs_clearcommit(struct mount *);
   int     nfs_writebp(struct buf *, int, struct thread *);
   int     nfs_fsinfo(struct nfsmount *, struct vnode *, struct ucred *,
               struct thread *);
   int     nfs_meta_setsize (struct vnode *, struct ucred *,
               struct thread *, u_quad_t);
   
   void    nfs_set_sigmask __P((struct thread *td, sigset_t *oldset));
   void    nfs_restore_sigmask __P((struct thread *td, sigset_t *set));
   int     nfs_tsleep __P((struct thread *td, void *ident, int priority, char *wmesg, 
                           int timo));
   int     nfs_msleep __P((struct thread *td, void *ident, struct mtx *mtx, int priority, 
                           char *wmesg, int timo));
   
   #endif  /* _KERNEL */
   
   #endif

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