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Annotation of 43BSDReno/sys/nfs/nfsnode.h, revision 1.1.1.1

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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