usr/src/sys/nfs/nfsnode.h

/*
 * Copyright (c) 1989 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.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)nfsnode.h   7.22 (Berkeley) %G%
 */

/*
 * 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];
};

/*
 * 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)
 */

struct nfsnode {
        struct  nfsnode *n_chain[2];    /* must be first */
        nfsv2fh_t n_fh;                 /* NFS File Handle */
        long    n_flag;                 /* Flag for locking.. */
        struct  vnode *n_vnode;         /* vnode associated with this node */
        time_t  n_attrstamp;            /* Time stamp for cached attributes */
        struct  vattr n_vattr;          /* Vnode attribute cache */
        struct  sillyrename *n_sillyrename; /* Ptr to silly rename struct */
        off_t   n_size;                 /* Current size of file */
        int     n_error;                /* Save write error value */
        u_long  n_direofoffset;         /* Dir. EOF offset cache */
        union {
                struct {
                        time_t  un_mtime; /* Prev modify time. */
                        time_t  un_ctime; /* Prev create time. */
                } un_nfs;
                struct {
                        u_quad_t un_brev; /* Modify rev when cached */
                        u_quad_t un_lrev; /* Modify rev for lease */
                        time_t  un_expiry; /* Lease expiry time */
                        struct  nfsnode *un_tnext; /* Nqnfs timer chain */
                        struct  nfsnode *un_tprev;
                } un_nqnfs;
        } n_un;
        struct  sillyrename n_silly;    /* Silly rename struct */
        long    n_spare[9];             /* Up to a power of 2 */
};

#define n_mtime         n_un.un_nfs.un_mtime
#define n_ctime         n_un.un_nfs.un_ctime
#define n_brev          n_un.un_nqnfs.un_brev
#define n_lrev          n_un.un_nqnfs.un_lrev
#define n_expiry        n_un.un_nqnfs.un_expiry
#define n_tnext         n_un.un_nqnfs.un_tnext
#define n_tprev         n_un.un_nqnfs.un_tprev

#define n_forw          n_chain[0]
#define n_back          n_chain[1]

#ifdef KERNEL
/*
 * Convert between nfsnode pointers and vnode pointers
 */
#define VTONFS(vp)      ((struct nfsnode *)(vp)->v_data)
#define NFSTOV(np)      ((struct vnode *)(np)->n_vnode)
#endif
/*
 * Flags for n_flag
 */
#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 */

/*
 * Prototypes for NFS vnode operations
 */
int     nfs_lookup __P((struct vop_lookup_args *));
int     nfs_create __P((struct vop_create_args *));
int     nfs_mknod __P((struct vop_mknod_args *));
int     nfs_open __P((struct vop_open_args *));
int     nfs_close __P((struct vop_close_args *));
int     nfs_access __P((struct vop_access_args *));
int     nfs_getattr __P((struct vop_getattr_args *));
int     nfs_setattr __P((struct vop_setattr_args *));
int     nfs_read __P((struct vop_read_args *));
int     nfs_write __P((struct vop_write_args *));
#define nfs_ioctl ((int (*) __P((struct  vop_ioctl_args *)))enoioctl)
#define nfs_select ((int (*) __P((struct  vop_select_args *)))seltrue)
int     nfs_mmap __P((struct vop_mmap_args *));
int     nfs_fsync __P((struct vop_fsync_args *));
#define nfs_seek ((int (*) __P((struct  vop_seek_args *)))nullop)
int     nfs_remove __P((struct vop_remove_args *));
int     nfs_link __P((struct vop_link_args *));
int     nfs_rename __P((struct vop_rename_args *));
int     nfs_mkdir __P((struct vop_mkdir_args *));
int     nfs_rmdir __P((struct vop_rmdir_args *));
int     nfs_symlink __P((struct vop_symlink_args *));
int     nfs_readdir __P((struct vop_readdir_args *));
int     nfs_readlink __P((struct vop_readlink_args *));
int     nfs_abortop __P((struct vop_abortop_args *));
int     nfs_inactive __P((struct vop_inactive_args *));
int     nfs_reclaim __P((struct vop_reclaim_args *));
int     nfs_lock __P((struct vop_lock_args *));
int     nfs_unlock __P((struct vop_unlock_args *));
int     nfs_bmap __P((struct vop_bmap_args *));
int     nfs_strategy __P((struct vop_strategy_args *));
int     nfs_print __P((struct vop_print_args *));
int     nfs_islocked __P((struct vop_islocked_args *));
int     nfs_advlock __P((struct vop_advlock_args *));
int     nfs_blkatoff __P((struct vop_blkatoff_args *));
int     nfs_vget __P((struct vop_vget_args *));
int     nfs_valloc __P((struct vop_valloc_args *));
int     nfs_vfree __P((struct vop_vfree_args *));
int     nfs_truncate __P((struct vop_truncate_args *));
int     nfs_update __P((struct vop_update_args *));
int     bwrite();               /* NFS needs a bwrite routine */