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

     /*
      * Copyright (c) 1989, 1993
      *      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.
     *
     *      @(#)nfsnode.h   8.9 (Berkeley) 5/14/95
     * $FreeBSD$
     */
    
    
    #ifndef _NFS_NFSNODE_H_
    #define _NFS_NFSNODE_H_
    
    #if !defined(_NFS_NFS_H_) && !defined(_KERNEL)
    #include <nfs/nfs.h>
    #endif
    
    /*
     * Silly rename structure that hangs off the nfsnode until the name
     * can be removed by nfs_inactive()
     */
    struct sillyrename {
            struct  ucred *s_cred;
            struct  vnode *s_dvp;
            long    s_namlen;
            char    s_name[20];
    };
    
    /*
     * This structure is used to save the logical directory offset to
     * NFS cookie mappings.
     * The mappings are stored in a list headed
     * by n_cookies, as required.
     * There is one mapping for each NFS_DIRBLKSIZ bytes of directory information
     * stored in increasing logical offset byte order.
     */
    #define NFSNUMCOOKIES           31
    
    struct nfsdmap {
            LIST_ENTRY(nfsdmap)     ndm_list;
            int                     ndm_eocookie;
            nfsuint64               ndm_cookies[NFSNUMCOOKIES];
    };
    
    /*
     * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
     * is purely coincidental.
     * There is a unique nfsnode allocated for each active file,
     * each current directory, each mounted-on file, text file, and the root.
     * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
     * If this structure exceeds 256 bytes (it is currently 256 using 4.4BSD-Lite
     * type definitions), file handles of > 32 bytes should probably be split out
     * into a separate MALLOC()'d data structure. (Reduce the size of nfsfh_t by
     * changing the definition in nfsproto.h of NFS_SMALLFH.)
     * NB: Hopefully the current order of the fields is such that everything will
     *     be well aligned and, therefore, tightly packed.
     */
    struct nfsnode {
            struct lock             n_lock;
            LIST_ENTRY(nfsnode)     n_hash;         /* Hash chain */
            CIRCLEQ_ENTRY(nfsnode)  n_timer;        /* Nqnfs timer chain */
            u_quad_t                n_size;         /* Current size of file */
            u_quad_t                n_brev;         /* Modify rev when cached */
            u_quad_t                n_lrev;         /* Modify rev for lease */
            struct vattr            n_vattr;        /* Vnode attribute cache */
            time_t                  n_attrstamp;    /* Attr. cache timestamp */
            u_int32_t               n_mode;         /* ACCESS mode cache */
            uid_t                   n_modeuid;      /* credentials having mode */
            time_t                  n_modestamp;    /* mode cache timestamp */
           time_t                  n_mtime;        /* Prev modify time. */
           time_t                  n_ctime;        /* Prev create time. */
           time_t                  n_expiry;       /* Lease expiry time */
           nfsfh_t                 *n_fhp;         /* NFS File Handle */
           struct vnode            *n_vnode;       /* associated vnode */
           struct lockf            *n_lockf;       /* Locking record of file */
           int                     n_error;        /* Save write error value */
           union {
                   struct timespec nf_atim;        /* Special file times */
                   nfsuint64       nd_cookieverf;  /* Cookie verifier (dir only) */
           } n_un1;
           union {
                   struct timespec nf_mtim;
                   off_t           nd_direof;      /* Dir. EOF offset cache */
           } n_un2;
           union {
                   struct sillyrename *nf_silly;   /* Ptr to silly rename struct */
                   LIST_HEAD(, nfsdmap) nd_cook;   /* cookies */
           } n_un3;
           short                   n_fhsize;       /* size in bytes, of fh */
           short                   n_flag;         /* Flag for locking.. */
           nfsfh_t                 n_fh;           /* Small File Handle */
           struct lock             n_rslock;
   };
   
   #define n_atim          n_un1.nf_atim
   #define n_mtim          n_un2.nf_mtim
   #define n_sillyrename   n_un3.nf_silly
   #define n_cookieverf    n_un1.nd_cookieverf
   #define n_direofoffset  n_un2.nd_direof
   #define n_cookies       n_un3.nd_cook
   
   /*
    * Flags for n_flag
    */
   #define NFLUSHWANT      0x0001  /* Want wakeup from a flush in prog. */
   #define NFLUSHINPROG    0x0002  /* Avoid multiple calls to vinvalbuf() */
   #define NMODIFIED       0x0004  /* Might have a modified buffer in bio */
   #define NWRITEERR       0x0008  /* Flag write errors so close will know */
   #define NQNFSNONCACHE   0x0020  /* Non-cachable lease */
   #define NQNFSWRITE      0x0040  /* Write lease */
   #define NQNFSEVICTED    0x0080  /* Has been evicted */
   #define NACC            0x0100  /* Special file accessed */
   #define NUPD            0x0200  /* Special file updated */
   #define NCHG            0x0400  /* Special file times changed */
   #define NLOCKED         0x0800  /* node is locked */
   #define NWANTED         0x0100  /* someone wants to lock */
   #define NSIZECHANGED    0x2000  /* File size has changed: need cache inval */
   
   /*
    * Convert between nfsnode pointers and vnode pointers
    */
   #define VTONFS(vp)      ((struct nfsnode *)(vp)->v_data)
   #define NFSTOV(np)      ((struct vnode *)(np)->n_vnode)
   
   /*
    * Queue head for nfsiod's
    */
   extern TAILQ_HEAD(nfs_bufq, buf) nfs_bufq;
   extern struct proc *nfs_iodwant[NFS_MAXASYNCDAEMON];
   extern struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON];
   
   #if defined(_KERNEL)
   
   /*
    *      nfs_rslock -    Attempt to obtain lock on nfsnode
    *
    *      Attempt to obtain a lock on the passed nfsnode, returning ENOLCK
    *      if the lock could not be obtained due to our having to sleep.  This
    *      function is generally used to lock around code that modifies an
    *      NFS file's size.  In order to avoid deadlocks the lock
    *      should not be obtained while other locks are being held.
    */
   
   static __inline
   int
   nfs_rslock(struct nfsnode *np, struct proc *p)
   {
           return(lockmgr(&np->n_rslock, LK_EXCLUSIVE | LK_CANRECURSE | LK_SLEEPFAIL, NULL, p));
   }
   
   static __inline
   void
   nfs_rsunlock(struct nfsnode *np, struct proc *p)
   {
           (void)lockmgr(&np->n_rslock, LK_RELEASE, NULL, p);
   }
   
   extern  vop_t   **fifo_nfsv2nodeop_p;
   extern  vop_t   **nfsv2_vnodeop_p;
   extern  vop_t   **spec_nfsv2nodeop_p;
   
   /*
    * Prototypes for NFS vnode operations
    */
   int     nfs_getpages __P((struct vop_getpages_args *));
   int     nfs_putpages __P((struct vop_putpages_args *));
   int     nfs_write __P((struct vop_write_args *));
   int     nqnfs_vop_lease_check __P((struct vop_lease_args *));
   int     nfs_inactive __P((struct vop_inactive_args *));
   int     nfs_reclaim __P((struct vop_reclaim_args *));
   
   /* other stuff */
   int     nfs_removeit __P((struct sillyrename *));
   int     nfs_nget __P((struct mount *,nfsfh_t *,int,struct nfsnode **));
   nfsuint64 *nfs_getcookie __P((struct nfsnode *, off_t, int));
   void nfs_invaldir __P((struct vnode *));
   
   #define nqnfs_lease_updatetime  nfs_lease_updatetime
   
   #endif /* _KERNEL */
   
   #endif

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