FreeBSD/Linux Kernel Cross Reference
sys/sys/vnode.h

     /*      $NetBSD: vnode.h,v 1.197.4.1 2009/07/21 00:31:58 snj Exp $      */
     
     /*-
      * Copyright (c) 2008 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    /*
     * Copyright (c) 1989, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * 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. 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.
     *
     *      @(#)vnode.h     8.17 (Berkeley) 5/20/95
     */
    
    #ifndef _SYS_VNODE_H_
    #define _SYS_VNODE_H_
    
    #include <sys/event.h>
    #include <sys/queue.h>
    #include <sys/condvar.h>
    #include <sys/rwlock.h>
    #include <sys/mutex.h>
    
    /* XXX: clean up includes later */
    #include <uvm/uvm_param.h>      /* XXX */
    #include <uvm/uvm_pglist.h>     /* XXX */
    #include <uvm/uvm_object.h>     /* XXX */
    #include <uvm/uvm_extern.h>     /* XXX */
    
    struct namecache;
    struct uvm_ractx;
    
    /*
     * The vnode is the focus of all file activity in UNIX.  There is a
     * unique vnode allocated for each active file, each current directory,
     * each mounted-on file, text file, and the root.
     */
    
    /*
     * Vnode types.  VNON means no type.  __VTYPE_DEFINED allows other
     * sources to override this definition.  __VTYPE_DEFINED should be
     * considered a temporary feature.
     */
    #ifndef __VTYPE_DEFINED
    #define __VTYPE_DEFINED
    enum vtype      { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
    #endif /* __VTYPE_DEFINED */
    
    #define VNODE_TYPES \
        "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"
    
    /*
     * Vnode tag types.
     * These are for the benefit of external programs only (e.g., pstat)
    * and should NEVER be inspected by the kernel.
    */
   enum vtagtype   {
           VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS, VT_LOFS,
           VT_FDESC, VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS,
           VT_AFS, VT_ISOFS, VT_UNION, VT_ADOSFS, VT_EXT2FS, VT_CODA,
           VT_FILECORE, VT_NTFS, VT_VFS, VT_OVERLAY, VT_SMBFS, VT_PTYFS,
           VT_TMPFS, VT_UDF, VT_SYSVBFS, VT_PUFFS, VT_HFS, VT_EFS, VT_ZFS
   };
   
   #define VNODE_TAGS \
       "VT_NON", "VT_UFS", "VT_NFS", "VT_MFS", "VT_MSDOSFS", "VT_LFS", "VT_LOFS", \
       "VT_FDESC", "VT_PORTAL", "VT_NULL", "VT_UMAP", "VT_KERNFS", "VT_PROCFS", \
       "VT_AFS", "VT_ISOFS", "VT_UNION", "VT_ADOSFS", "VT_EXT2FS", "VT_CODA", \
       "VT_FILECORE", "VT_NTFS", "VT_VFS", "VT_OVERLAY", "VT_SMBFS", "VT_PTYFS", \
       "VT_TMPFS", "VT_UDF", "VT_SYSVBFS", "VT_PUFFS", "VT_HFS", "VT_EFS", "VT_ZFS"
   
   struct vnode;
   struct buf;
   
   LIST_HEAD(buflists, buf);
   TAILQ_HEAD(vnodelst, vnode);
   
   struct vnlock {
           krwlock_t       vl_lock;
           u_int           vl_canrecurse;
           u_int           vl_recursecnt;
   };
   
   /*
    * Reading or writing any of these items requires holding the appropriate
    * lock.  Field markings and the corresponding locks:
    *
    *      :       stable, reference to the vnode is is required
    *      f       vnode_free_list_lock, or vrele_lock if VI_INACTPEND
    *      i       v_interlock
    *      m       mntvnode_lock
    *      n       namecache_lock
    *      s       syncer_data_lock
    *      u       locked by underlying filesystem
    *      v       v_vnlock
    *      x       v_interlock + bufcache_lock to modify, either to inspect
    *
    * Each underlying filesystem allocates its own private area and hangs
    * it from v_data.
    */
   struct vnode {
           struct uvm_object v_uobj;               /* i: the VM object */
           kcondvar_t      v_cv;                   /* i: synchronization */
           voff_t          v_size;                 /* i: size of file */
           voff_t          v_writesize;            /* i: new size after write */
           int             v_iflag;                /* i: VI_* flags */
           int             v_vflag;                /* v: VV_* flags */
           int             v_uflag;                /* u: VU_* flags */
           int             v_numoutput;            /* i: # of pending writes */
           int             v_writecount;           /* i: ref count of writers */
           int             v_holdcnt;              /* i: page & buffer refs */
           int             v_synclist_slot;        /* s: synclist slot index */
           struct mount    *v_mount;               /* v: ptr to vfs we are in */
           int             (**v_op)(void *);       /* :: vnode operations vector */
           TAILQ_ENTRY(vnode) v_freelist;          /* f: vnode freelist */
           struct vnodelst *v_freelisthd;          /* f: which freelist? */
           TAILQ_ENTRY(vnode) v_mntvnodes;         /* m: vnodes for mount point */
           struct buflists v_cleanblkhd;           /* x: clean blocklist head */
           struct buflists v_dirtyblkhd;           /* x: dirty blocklist head */
           TAILQ_ENTRY(vnode) v_synclist;          /* s: vnodes with dirty bufs */
           LIST_HEAD(, namecache) v_dnclist;       /* n: namecaches (children) */
           LIST_HEAD(, namecache) v_nclist;        /* n: namecaches (parent) */
           union {
                   struct mount    *vu_mountedhere;/* v: ptr to vfs (VDIR) */
                   struct socket   *vu_socket;     /* v: unix ipc (VSOCK) */
                   struct specnode *vu_specnode;   /* v: device (VCHR, VBLK) */
                   struct fifoinfo *vu_fifoinfo;   /* v: fifo (VFIFO) */
                   struct uvm_ractx *vu_ractx;     /* i: read-ahead ctx (VREG) */
           } v_un;
           enum vtype      v_type;                 /* :: vnode type */
           enum vtagtype   v_tag;                  /* :: type of underlying data */
           struct vnlock   v_lock;                 /* v: lock for this vnode */
           struct vnlock   *v_vnlock;              /* v: pointer to lock */
           void            *v_data;                /* :: private data for fs */
           struct klist    v_klist;                /* i: notes attached to vnode */
   };
   #define v_usecount      v_uobj.uo_refs
   #define v_interlock     v_uobj.vmobjlock
   #define v_mountedhere   v_un.vu_mountedhere
   #define v_socket        v_un.vu_socket
   #define v_specnode      v_un.vu_specnode
   #define v_fifoinfo      v_un.vu_fifoinfo
   #define v_ractx         v_un.vu_ractx
   
   typedef struct vnodelst vnodelst_t;
   typedef struct vnode vnode_t;
   
   /*
    * All vnode locking operations should use vp->v_vnlock. For leaf filesystems
    * (such as ffs, lfs, msdosfs, etc), vp->v_vnlock = &vp->v_lock. For
    * stacked filesystems, vp->v_vnlock may equal lowervp->v_vnlock.
    *
    * vp->v_vnlock may also be NULL, which indicates that a leaf node does not
    * export a struct lock for vnode locking. Stacked filesystems (such as
    * nullfs) must call the underlying fs for locking. See layerfs_ routines
    * for examples.
    *
    * All filesystems must (pretend to) understand lockmanager flags.
    */
   
   /*
    * Vnode flags.  The first set are locked by vp->v_vnlock or are stable.
    * VSYSTEM is only used to skip vflush()ing quota files.  VISTTY is used
    * when reading dead vnodes.
    */
   #define VV_ROOT         0x00000001      /* root of its file system */
   #define VV_SYSTEM       0x00000002      /* vnode being used by kernel */
   #define VV_ISTTY        0x00000004      /* vnode represents a tty */
   #define VV_MAPPED       0x00000008      /* vnode might have user mappings */
   #define VV_MPSAFE       0x00000010      /* file system code is MP safe */
   #define VV_LOCKSWORK    0x00000020      /* FS supports locking discipline */
   
   /* XXXAD ALIASED should be covered by spec lock? */
   
   /*
    * The second set are locked by vp->v_interlock.
    */
   #define VI_TEXT         0x00000100      /* vnode is a pure text prototype */
   #define VI_EXECMAP      0x00000200      /* might have PROT_EXEC mappings */
   #define VI_WRMAP        0x00000400      /* might have PROT_WRITE u. mappings */
   #define VI_WRMAPDIRTY   0x00000800      /* might have dirty pages */
   #define VI_XLOCK        0x00001000      /* vnode is locked to change type */
   #define VI_ONWORKLST    0x00004000      /* On syncer work-list */
   #define VI_MARKER       0x00008000      /* Dummy marker vnode */
   #define VI_LAYER        0x00020000      /* vnode is on a layer filesystem */
   #define VI_CLEAN        0x00080000      /* has been reclaimed */
   #define VI_INACTPEND    0x00100000      /* inactivation is pending */
   #define VI_INACTREDO    0x00200000      /* need to redo VOP_INACTIVE() */
   #define VI_FREEING      0x00400000      /* vnode is being freed */
   #define VI_INACTNOW     0x00800000      /* VOP_INACTIVE() in progress */
   
   /*
    * The third set are locked by the underlying file system.
    */
   #define VU_DIROP        0x01000000      /* LFS: involved in a directory op */
   #define VU_SOFTDEP      0x02000000      /* FFS: involved in softdep processing */
   
   #define VNODE_FLAGBITS \
       "\2\1ROOT\2SYSTEM\3ISTTY\4MAPPED\5MPSAFE\6LOCKSWORK\11TEXT\12EXECMAP" \
       "\13WRMAP\14WRMAPDIRTY\15XLOCK\17ONWORKLST\20MARKER" \
       "\22LAYER\24CLEAN\25INACTPEND\26INACTREDO\27FREEING" \
       "\28INACTNOW\31DIROP\32SOFTDEP" 
   
   #define VSIZENOTSET     ((voff_t)-1)
   
   /*
    * v_usecount; see the comment in vfs_subr.c
    */
   #define VC_XLOCK        0x80000000
   #define VC_MASK         0x7fffffff
   
   /*
    * Vnode attributes.  A field value of VNOVAL represents a field whose value
    * is unavailable (getattr) or which is not to be changed (setattr).
    */
   struct vattr {
           enum vtype      va_type;        /* vnode type (for create) */
           mode_t          va_mode;        /* files access mode and type */
           nlink_t         va_nlink;       /* number of references to file */
           uid_t           va_uid;         /* owner user id */
           gid_t           va_gid;         /* owner group id */
           long            va_fsid;        /* file system id (dev for now) */
           ino_t           va_fileid;      /* file id */
           u_quad_t        va_size;        /* file size in bytes */
           long            va_blocksize;   /* blocksize preferred for i/o */
           struct timespec va_atime;       /* time of last access */
           struct timespec va_mtime;       /* time of last modification */
           struct timespec va_ctime;       /* time file changed */
           struct timespec va_birthtime;   /* time file created */
           u_long          va_gen;         /* generation number of file */
           u_long          va_flags;       /* flags defined for file */
           dev_t           va_rdev;        /* device the special file represents */
           u_quad_t        va_bytes;       /* bytes of disk space held by file */
           u_quad_t        va_filerev;     /* file modification number */
           u_int           va_vaflags;     /* operations flags, see below */
           long            va_spare;       /* remain quad aligned */
   };
   
   /*
    * Flags for va_vaflags.
    */
   #define VA_UTIMES_NULL  0x01            /* utimes argument was NULL */
   #define VA_EXCLUSIVE    0x02            /* exclusive create request */
   
   #ifdef _KERNEL
   
   /*
    * Flags for ioflag.
    */
   #define IO_UNIT         0x00010         /* do I/O as atomic unit */
   #define IO_APPEND       0x00020         /* append write to end */
   #define IO_SYNC         (0x40|IO_DSYNC) /* sync I/O file integrity completion */
   #define IO_NODELOCKED   0x00080         /* underlying node already locked */
   #define IO_NDELAY       0x00100         /* FNDELAY flag set in file table */
   #define IO_DSYNC        0x00200         /* sync I/O data integrity completion */
   #define IO_ALTSEMANTICS 0x00400         /* use alternate i/o semantics */
   #define IO_NORMAL       0x00800         /* operate on regular data */
   #define IO_EXT          0x01000         /* operate on extended attributes */
   #define IO_DIRECT       0x02000         /* direct I/O hint */
   #define IO_JOURNALLOCKED 0x04000        /* journal is already locked */
   #define IO_ADV_MASK     0x00003         /* access pattern hint */
   
   #define IO_ADV_SHIFT    0
   #define IO_ADV_ENCODE(adv)      (((adv) << IO_ADV_SHIFT) & IO_ADV_MASK)
   #define IO_ADV_DECODE(ioflag)   (((ioflag) & IO_ADV_MASK) >> IO_ADV_SHIFT)
   
   /*
    *  Modes.
    */
   #define VREAD   00004           /* read, write, execute permissions */
   #define VWRITE  00002
   #define VEXEC   00001
   
   /*
    * Token indicating no attribute value yet assigned.
    */
   #define VNOVAL  (-1)
   
   /*
    * Convert between vnode types and inode formats (since POSIX.1
    * defines mode word of stat structure in terms of inode formats).
    */
   extern const enum vtype iftovt_tab[];
   extern const int        vttoif_tab[];
   #define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
   #define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
   #define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))
   
   /*
    * Flags to various vnode functions.
    */
   #define SKIPSYSTEM      0x0001          /* vflush: skip vnodes marked VSYSTEM */
   #define FORCECLOSE      0x0002          /* vflush: force file closeure */
   #define WRITECLOSE      0x0004          /* vflush: only close writable files */
   #define DOCLOSE         0x0008          /* vclean: close active files */
   #define V_SAVE          0x0001          /* vinvalbuf: sync file first */
   
   /*
    * Flags to various vnode operations.
    */
   #define REVOKEALL       0x0001          /* revoke: revoke all aliases */
   
   #define FSYNC_WAIT      0x0001          /* fsync: wait for completion */
   #define FSYNC_DATAONLY  0x0002          /* fsync: hint: sync file data only */
   #define FSYNC_RECLAIM   0x0004          /* fsync: hint: vnode is being reclaimed */
   #define FSYNC_LAZY      0x0008          /* fsync: lazy sync (trickle) */
   #define FSYNC_NOLOG     0x0010          /* fsync: do not flush the log */
   #define FSYNC_CACHE     0x0100          /* fsync: flush disk caches too */
   #define FSYNC_VFS       0x0200          /* fsync: via FSYNC_VFS() */
   
   #define UPDATE_WAIT     0x0001          /* update: wait for completion */
   #define UPDATE_DIROP    0x0002          /* update: hint to fs to wait or not */
   #define UPDATE_CLOSE    0x0004          /* update: clean up on close */
   
   #define HOLDRELE(vp)    holdrele(vp)
   #define VHOLD(vp)       vhold(vp)
   #define VREF(vp)        vref(vp)
   extern kmutex_t vnode_free_list_lock;
   
   void holdrelel(struct vnode *);
   void vholdl(struct vnode *);
   void vref(struct vnode *);
   
   static __inline void holdrele(struct vnode *) __unused;
   static __inline void vhold(struct vnode *) __unused;
   
   #define VATTR_NULL(vap) vattr_null(vap)
   
   /*
    * decrease buf or page ref
    */
   static __inline void
   holdrele(struct vnode *vp)
   {
   
           mutex_enter(&vp->v_interlock);
           holdrelel(vp);
           mutex_exit(&vp->v_interlock);
   }
   
   /*
    * increase buf or page ref
    */
   static __inline void
   vhold(struct vnode *vp)
   {
   
           mutex_enter(&vp->v_interlock);
           vholdl(vp);
           mutex_exit(&vp->v_interlock);
   }
   
   static __inline bool
   vismarker(struct vnode *vp)
   {
   
           return (vp->v_iflag & VI_MARKER) != 0;
   }
   
   #define NULLVP  ((struct vnode *)NULL)
   
   static __inline void
   VN_KNOTE(struct vnode *vp, long hint)
   {
   
           mutex_enter(&vp->v_interlock);
           KNOTE(&vp->v_klist, hint);
           mutex_exit(&vp->v_interlock);
   }
   
   /*
    * Global vnode data.
    */
   extern struct vnode     *rootvnode;     /* root (i.e. "/") vnode */
   extern int              desiredvnodes;  /* number of vnodes desired */
   extern u_int            numvnodes;      /* current number of vnodes */
   extern time_t           syncdelay;      /* max time to delay syncing data */
   extern time_t           filedelay;      /* time to delay syncing files */
   extern time_t           dirdelay;       /* time to delay syncing directories */
   extern time_t           metadelay;      /* time to delay syncing metadata */
   
   /*
    * Macro/function to check for client cache inconsistency w.r.t. leasing.
    */
   #define LEASE_READ      0x1             /* Check lease for readers */
   #define LEASE_WRITE     0x2             /* Check lease for modifiers */
   
   #endif /* _KERNEL */
   
   
   /*
    * Mods for exensibility.
    */
   
   /*
    * Flags for vdesc_flags:
    */
   #define VDESC_MAX_VPS           8
   /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
   #define VDESC_VP0_WILLRELE      0x00000001
   #define VDESC_VP1_WILLRELE      0x00000002
   #define VDESC_VP2_WILLRELE      0x00000004
   #define VDESC_VP3_WILLRELE      0x00000008
   #define VDESC_VP0_WILLUNLOCK    0x00000100
   #define VDESC_VP1_WILLUNLOCK    0x00000200
   #define VDESC_VP2_WILLUNLOCK    0x00000400
   #define VDESC_VP3_WILLUNLOCK    0x00000800
   #define VDESC_VP0_WILLPUT       0x00000101
   #define VDESC_VP1_WILLPUT       0x00000202
   #define VDESC_VP2_WILLPUT       0x00000404
   #define VDESC_VP3_WILLPUT       0x00000808
   #define VDESC_NOMAP_VPP         0x00010000
   #define VDESC_VPP_WILLRELE      0x00020000
   
   /*
    * VDESC_NO_OFFSET is used to identify the end of the offset list
    * and in places where no such field exists.
    */
   #define VDESC_NO_OFFSET -1
   
   /*
    * This structure describes the vnode operation taking place.
    */
   struct vnodeop_desc {
           int             vdesc_offset;   /* offset in vector--first for speed */
           const char      *vdesc_name;    /* a readable name for debugging */
           int             vdesc_flags;    /* VDESC_* flags */
   
           /*
            * These ops are used by bypass routines to map and locate arguments.
            * Creds and procs are not needed in bypass routines, but sometimes
            * they are useful to (for example) transport layers.
            * Nameidata is useful because it has a cred in it.
            */
           const int       *vdesc_vp_offsets;      /* list ended by VDESC_NO_OFFSET */
           int             vdesc_vpp_offset;       /* return vpp location */
           int             vdesc_cred_offset;      /* cred location, if any */
           int             vdesc_componentname_offset; /* if any */
           /*
            * Finally, we've got a list of private data (about each operation)
            * for each transport layer.  (Support to manage this list is not
            * yet part of BSD.)
            */
           void *          *vdesc_transports;
   };
   
   #ifdef _KERNEL
   #include <sys/mallocvar.h>
   MALLOC_DECLARE(M_CACHE);
   MALLOC_DECLARE(M_VNODE);
   
   /*
    * A list of all the operation descs.
    */
   extern struct vnodeop_desc      *vnodeop_descs[];
   
   /*
    * Interlock for scanning list of vnodes attached to a mountpoint
    */
   extern kmutex_t         mntvnode_lock;
   
   /*
    * Union filesystem hook for vn_readdir().
    */
   extern int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *);
   
   /*
    * This macro is very helpful in defining those offsets in the vdesc struct.
    *
    * This is stolen from X11R4.  I ingored all the fancy stuff for
    * Crays, so if you decide to port this to such a serious machine,
    * you might want to consult Intrisics.h's XtOffset{,Of,To}.
    */
   #define VOPARG_OFFSET(p_type,field) \
           ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
   #define VOPARG_OFFSETOF(s_type,field) \
           VOPARG_OFFSET(s_type*,field)
   #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
           ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
   
   
   /*
    * This structure is used to configure the new vnodeops vector.
    */
   struct vnodeopv_entry_desc {
           const struct vnodeop_desc *opve_op;     /* which operation this is */
           int (*opve_impl)(void *);       /* code implementing this operation */
   };
   struct vnodeopv_desc {
                           /* ptr to the ptr to the vector where op should go */
           int (***opv_desc_vector_p)(void *);
           const struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
   };
   
   /*
    * A default routine which just returns an error.
    */
   int vn_default_error(void *);
   
   /*
    * A generic structure.
    * This can be used by bypass routines to identify generic arguments.
    */
   struct vop_generic_args {
           struct vnodeop_desc *a_desc;
           /* other random data follows, presumably */
   };
   
   /*
    * VOCALL calls an op given an ops vector.  We break it out because BSD's
    * vclean changes the ops vector and then wants to call ops with the old
    * vector.
    */
   /*
    * actually, vclean doesn't use it anymore, but nfs does,
    * for device specials and fifos.
    */
   #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
   
   /*
    * This call works for vnodes in the kernel.
    */
   #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
   #define VDESC(OP) (& __CONCAT(OP,_desc))
   #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
   
   /* XXX This include should go away */
   #include <sys/mount.h>
   
   /*
    * Finally, include the default set of vnode operations.
    */
   #include <sys/vnode_if.h>
   
   /*
    * Public vnode manipulation functions.
    */
   struct file;
   struct filedesc;
   struct nameidata;
   struct proc;
   struct stat;
   struct uio;
   struct vattr;
   struct vnode;
   
   /* see vnode(9) */
   int     bdevvp(dev_t, struct vnode **);
   int     cdevvp(dev_t, struct vnode **);
   int     getnewvnode(enum vtagtype, struct mount *, int (**)(void *),
               struct vnode **);
   void    ungetnewvnode(struct vnode *);
   int     vaccess(enum vtype, mode_t, uid_t, gid_t, mode_t, kauth_cred_t);
   void    vattr_null(struct vattr *);
   int     vcount(struct vnode *);
   void    vdevgone(int, int, int, enum vtype);
   int     vfinddev(dev_t, enum vtype, struct vnode **);
   int     vflush(struct mount *, struct vnode *, int);
   void    vflushbuf(struct vnode *, int);
   int     vget(struct vnode *, int);
   bool    vtryget(struct vnode *);
   void    vgone(struct vnode *);
   void    vgonel(struct vnode *, struct lwp *);
   int     vinvalbuf(struct vnode *, int, kauth_cred_t, struct lwp *, bool, int);
   void    vprint(const char *, struct vnode *);
   void    vput(struct vnode *);
   int     vrecycle(struct vnode *, kmutex_t *, struct lwp *);
   void    vrele(struct vnode *);
   int     vtruncbuf(struct vnode *, daddr_t, bool, int);
   void    vwakeup(struct buf *);
   void    vwait(struct vnode *, int);
   void    vclean(struct vnode *, int);
   void    vrevoke(struct vnode *);
   void    vrelel(struct vnode *, int);
   #define VRELEL_NOINACTIVE       0x01
   #define VRELEL_ONHEAD           0x02
   struct vnode *
           vnalloc(struct mount *);
   void    vnfree(struct vnode *);
   void    vmark(struct vnode *, struct vnode *);
   struct vnode *
           vunmark(struct vnode *);
   void    vn_init1(void);
   
   /* see vnsubr(9) */
   int     vn_bwrite(void *);
   int     vn_close(struct vnode *, int, kauth_cred_t);
   int     vn_isunder(struct vnode *, struct vnode *, struct lwp *);
   int     vn_lock(struct vnode *, int);
   void    vn_markexec(struct vnode *);
   int     vn_marktext(struct vnode *);
   int     vn_open(struct nameidata *, int, int);
   int     vn_rdwr(enum uio_rw, struct vnode *, void *, int, off_t, enum uio_seg,
       int, kauth_cred_t, size_t *, struct lwp *);
   int     vn_readdir(struct file *, char *, int, u_int, int *, struct lwp *,
       off_t **, int *);
   void    vn_restorerecurse(struct vnode *, u_int);
   u_int   vn_setrecurse(struct vnode *);
   int     vn_stat(struct vnode *, struct stat *);
   int     vn_kqfilter(struct file *, struct knote *);
   int     vn_writechk(struct vnode *);
   int     vn_openchk(struct vnode *, kauth_cred_t, int);
   int     vn_extattr_get(struct vnode *, int, int, const char *, size_t *,
               void *, struct lwp *);
   int     vn_extattr_set(struct vnode *, int, int, const char *, size_t,
               const void *, struct lwp *);
   int     vn_extattr_rm(struct vnode *, int, int, const char *, struct lwp *);
   void    vn_ra_allocctx(struct vnode *);
   
   /* initialise global vnode management */
   void    vntblinit(void);
   
   /* misc stuff */
   void    vn_syncer_add_to_worklist(struct vnode *, int);
   void    vn_syncer_remove_from_worklist(struct vnode *);
   int     speedup_syncer(void);
   int     dorevoke(struct vnode *, kauth_cred_t);
   int     vlockmgr(struct vnlock *, int);
   int     vlockstatus(struct vnlock *);
   
   /* see vfssubr(9) */
   void    vfs_getnewfsid(struct mount *);
   int     vfs_drainvnodes(long target, struct lwp *);
   void    vfs_timestamp(struct timespec *);
   #ifdef DDB
   void    vfs_vnode_print(struct vnode *, int, void (*)(const char *, ...));
   void    vfs_mount_print(struct mount *, int, void (*)(const char *, ...));
   #endif /* DDB */
   #endif /* _KERNEL */
   
   #endif /* !_SYS_VNODE_H_ */

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