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Annotation of 43BSDReno/sys/nfs/nfsnode.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Rick Macklem at The University of Guelph.
        !             7:  *
        !             8:  * Redistribution is only permitted until one year after the first shipment
        !             9:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !            10:  * binary forms are permitted provided that: (1) source distributions retain
        !            11:  * this entire copyright notice and comment, and (2) distributions including
        !            12:  * binaries display the following acknowledgement:  This product includes
        !            13:  * software developed by the University of California, Berkeley and its
        !            14:  * contributors'' in the documentation or other materials provided with the
        !            15:  * distribution and in all advertising materials mentioning features or use
        !            16:  * of this software.  Neither the name of the University nor the names of
        !            17:  * its contributors may be used to endorse or promote products derived from
        !            18:  * this software without specific prior written permission.
        !            19:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            20:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            21:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            22:  *
        !            23:  *     @(#)nfsnode.h   7.11 (Berkeley) 6/28/90
        !            24:  */
        !            25: 
        !            26: /*
        !            27:  * The nfsnode is the nfs equivalent to ufs's inode. Any similarity
        !            28:  * is purely coincidental.
        !            29:  * There is a unique nfsnode allocated for each active file,
        !            30:  * each current directory, each mounted-on file, text file, and the root.
        !            31:  * An nfsnode is 'named' by its file handle. (nget/nfs_node.c)
        !            32:  */
        !            33: 
        !            34: struct nfsnode {
        !            35:        struct  nfsnode *n_chain[2];    /* must be first */
        !            36:        nfsv2fh_t n_fh;                 /* NFS File Handle */
        !            37:        long    n_flag;                 /* Flag for locking.. */
        !            38:        struct  vnode *n_vnode; /* vnode associated with this nfsnode */
        !            39:        time_t  n_attrstamp;    /* Time stamp (sec) for attributes */
        !            40:        struct  vattr n_vattr;  /* Vnode attribute cache */
        !            41:        struct  sillyrename *n_sillyrename;     /* Ptr to silly rename struct */
        !            42:        u_long  n_size;         /* Current size of file */
        !            43:        time_t  n_mtime;        /* Prev modify time to maintain data cache consistency*/
        !            44:        time_t  n_ctime;        /* Prev create time for name cache consistency*/
        !            45:        int     n_error;        /* Save write error value */
        !            46:        pid_t   n_lockholder;   /* holder of nfsnode lock */
        !            47:        pid_t   n_lockwaiter;   /* most recent waiter for nfsnode lock */
        !            48:        u_long  n_direofoffset; /* Dir. EOF offset cache */
        !            49: };
        !            50: 
        !            51: #define        n_forw          n_chain[0]
        !            52: #define        n_back          n_chain[1]
        !            53: 
        !            54: #ifdef KERNEL
        !            55: /*
        !            56:  * Convert between nfsnode pointers and vnode pointers
        !            57:  */
        !            58: #define VTONFS(vp)     ((struct nfsnode *)(vp)->v_data)
        !            59: #define NFSTOV(np)     ((struct vnode *)(np)->n_vnode)
        !            60: #endif
        !            61: /*
        !            62:  * Flags for n_flag
        !            63:  */
        !            64: #define        NLOCKED         0x1     /* Lock the node for other local accesses */
        !            65: #define        NWANT           0x2     /* Want above lock */
        !            66: #define        NMODIFIED       0x4     /* Might have a modified buffer in bio */
        !            67: #define        NWRITEERR       0x8     /* Flag write errors so close will know */

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