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

     /*-
      * 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.
     * 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.
     *
     *      @(#)vnode.h     8.7 (Berkeley) 2/4/94
     * $FreeBSD: releng/10.4/sys/sys/vnode.h 301100 2016-06-01 04:07:33Z kib $
     */
    
    #ifndef _SYS_VNODE_H_
    #define _SYS_VNODE_H_
    
    #include <sys/bufobj.h>
    #include <sys/queue.h>
    #include <sys/lock.h>
    #include <sys/lockmgr.h>
    #include <sys/mutex.h>
    #include <sys/rangelock.h>
    #include <sys/selinfo.h>
    #include <sys/uio.h>
    #include <sys/acl.h>
    #include <sys/ktr.h>
    
    /*
     * 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.
     */
    enum vtype      { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD,
                      VMARKER };
    
    /*
     * Each underlying filesystem allocates its own private area and hangs
     * it from v_data.  If non-null, this area is freed in getnewvnode().
     */
    
    struct namecache;
    
    struct vpollinfo {
            struct  mtx vpi_lock;           /* lock to protect below */
            struct  selinfo vpi_selinfo;    /* identity of poller(s) */
            short   vpi_events;             /* what they are looking for */
            short   vpi_revents;            /* what has happened */
    };
    
    /*
     * Reading or writing any of these items requires holding the appropriate lock.
     *
     * Lock reference:
     *      c - namecache mutex
     *      f - freelist mutex
     *      i - interlock
     *      m - mount point interlock
     *      p - pollinfo lock
     *      u - Only a reference to the vnode is needed to read.
     *      v - vnode lock
     *
     * Vnodes may be found on many lists.  The general way to deal with operating
     * on a vnode that is on a list is:
     *      1) Lock the list and find the vnode.
     *      2) Lock interlock so that the vnode does not go away.
     *      3) Unlock the list to avoid lock order reversals.
     *      4) vget with LK_INTERLOCK and check for ENOENT, or
     *      5) Check for DOOMED if the vnode lock is not required.
     *      6) Perform your operation, then vput().
     */
    
    #if defined(_KERNEL) || defined(_KVM_VNODE)
    
    struct vnode {
            /*
             * Fields which define the identity of the vnode.  These fields are
            * owned by the filesystem (XXX: and vgone() ?)
            */
           const char *v_tag;                      /* u type of underlying data */
           struct  vop_vector *v_op;               /* u vnode operations vector */
           void    *v_data;                        /* u private data for fs */
   
           /*
            * Filesystem instance stuff
            */
           struct  mount *v_mount;                 /* u ptr to vfs we are in */
           TAILQ_ENTRY(vnode) v_nmntvnodes;        /* m vnodes for mount point */
   
           /*
            * Type specific fields, only one applies to any given vnode.
            * See #defines below for renaming to v_* namespace.
            */
           union {
                   struct mount    *vu_mount;      /* v ptr to mountpoint (VDIR) */
                   struct socket   *vu_socket;     /* v unix domain net (VSOCK) */
                   struct cdev     *vu_cdev;       /* v device (VCHR, VBLK) */
                   struct fifoinfo *vu_fifoinfo;   /* v fifo (VFIFO) */
           } v_un;
   
           /*
            * vfs_hash: (mount + inode) -> vnode hash.  The hash value
            * itself is grouped with other int fields, to avoid padding.
            */
           LIST_ENTRY(vnode)       v_hashlist;
   
           /*
            * VFS_namecache stuff
            */
           LIST_HEAD(, namecache) v_cache_src;     /* c Cache entries from us */
           TAILQ_HEAD(, namecache) v_cache_dst;    /* c Cache entries to us */
           struct namecache *v_cache_dd;           /* c Cache entry for .. vnode */
   
           /*
            * Locking
            */
           struct  lock v_lock;                    /* u (if fs don't have one) */
           struct  mtx v_interlock;                /* lock for "i" things */
           struct  lock *v_vnlock;                 /* u pointer to vnode lock */
   
           /*
            * The machinery of being a vnode
            */
           TAILQ_ENTRY(vnode) v_actfreelist;       /* f vnode active/free lists */
           struct bufobj   v_bufobj;               /* * Buffer cache object */
   
           /*
            * Hooks for various subsystems and features.
            */
           struct vpollinfo *v_pollinfo;           /* i Poll events, p for *v_pi */
           struct label *v_label;                  /* MAC label for vnode */
           struct lockf *v_lockf;          /* Byte-level advisory lock list */
           struct rangelock v_rl;                  /* Byte-range lock */
   
           /*
            * clustering stuff
            */
           daddr_t v_cstart;                       /* v start block of cluster */
           daddr_t v_lasta;                        /* v last allocation  */
           daddr_t v_lastw;                        /* v last write  */
           int     v_clen;                         /* v length of cur. cluster */
   
           int     v_holdcnt;                      /* i prevents recycling. */
           int     v_usecount;                     /* i ref count of users */
           u_int   v_iflag;                        /* i vnode flags (see below) */
           u_int   v_vflag;                        /* v vnode flags */
           int     v_writecount;                   /* v ref count of writers */
           u_int   v_hash;
           enum    vtype v_type;                   /* u vnode type */
   };
   
   #endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
   
   #define v_mountedhere   v_un.vu_mount
   #define v_socket        v_un.vu_socket
   #define v_rdev          v_un.vu_cdev
   #define v_fifoinfo      v_un.vu_fifoinfo
   
   /* XXX: These are temporary to avoid a source sweep at this time */
   #define v_object        v_bufobj.bo_object
   
   /*
    * Userland version of struct vnode, for sysctl.
    */
   struct xvnode {
           size_t  xv_size;                        /* sizeof(struct xvnode) */
           void    *xv_vnode;                      /* address of real vnode */
           u_long  xv_flag;                        /* vnode vflags */
           int     xv_usecount;                    /* reference count of users */
           int     xv_writecount;                  /* reference count of writers */
           int     xv_holdcnt;                     /* page & buffer references */
           u_long  xv_id;                          /* capability identifier */
           void    *xv_mount;                      /* address of parent mount */
           long    xv_numoutput;                   /* num of writes in progress */
           enum    vtype xv_type;                  /* vnode type */
           union {
                   void    *xvu_socket;            /* socket, if VSOCK */
                   void    *xvu_fifo;              /* fifo, if VFIFO */
                   dev_t   xvu_rdev;               /* maj/min, if VBLK/VCHR */
                   struct {
                           dev_t   xvu_dev;        /* device, if VDIR/VREG/VLNK */
                           ino_t   xvu_ino;        /* id, if VDIR/VREG/VLNK */
                   } xv_uns;
           } xv_un;
   };
   #define xv_socket       xv_un.xvu_socket
   #define xv_fifo         xv_un.xvu_fifo
   #define xv_rdev         xv_un.xvu_rdev
   #define xv_dev          xv_un.xv_uns.xvu_dev
   #define xv_ino          xv_un.xv_uns.xvu_ino
   
   /* We don't need to lock the knlist */
   #define VN_KNLIST_EMPTY(vp) ((vp)->v_pollinfo == NULL ||        \
               KNLIST_EMPTY(&(vp)->v_pollinfo->vpi_selinfo.si_note))
   
   #define VN_KNOTE(vp, b, a)                                      \
           do {                                                    \
                   if (!VN_KNLIST_EMPTY(vp))                       \
                           KNOTE(&vp->v_pollinfo->vpi_selinfo.si_note, (b), \
                               (a) | KNF_NOKQLOCK);                \
           } while (0)
   #define VN_KNOTE_LOCKED(vp, b)          VN_KNOTE(vp, b, KNF_LISTLOCKED)
   #define VN_KNOTE_UNLOCKED(vp, b)        VN_KNOTE(vp, b, 0)
   
   /*
    * Vnode flags.
    *      VI flags are protected by interlock and live in v_iflag
    *      VV flags are protected by the vnode lock and live in v_vflag
    *
    *      VI_DOOMED is doubly protected by the interlock and vnode lock.  Both
    *      are required for writing but the status may be checked with either.
    */
   #define VI_MOUNT        0x0020  /* Mount in progress */
   #define VI_AGE          0x0040  /* Insert vnode at head of free list */
   #define VI_DOOMED       0x0080  /* This vnode is being recycled */
   #define VI_FREE         0x0100  /* This vnode is on the freelist */
   #define VI_ACTIVE       0x0200  /* This vnode is on the active list */
   #define VI_DOINGINACT   0x0800  /* VOP_INACTIVE is in progress */
   #define VI_OWEINACT     0x1000  /* Need to call inactive */
   
   #define VV_ROOT         0x0001  /* root of its filesystem */
   #define VV_ISTTY        0x0002  /* vnode represents a tty */
   #define VV_NOSYNC       0x0004  /* unlinked, stop syncing */
   #define VV_ETERNALDEV   0x0008  /* device that is never destroyed */
   #define VV_CACHEDLABEL  0x0010  /* Vnode has valid cached MAC label */
   #define VV_TEXT         0x0020  /* vnode is a pure text prototype */
   #define VV_COPYONWRITE  0x0040  /* vnode is doing copy-on-write */
   #define VV_SYSTEM       0x0080  /* vnode being used by kernel */
   #define VV_PROCDEP      0x0100  /* vnode is process dependent */
   #define VV_NOKNOTE      0x0200  /* don't activate knotes on this vnode */
   #define VV_DELETED      0x0400  /* should be removed */
   #define VV_MD           0x0800  /* vnode backs the md device */
   #define VV_FORCEINSMQ   0x1000  /* force the insmntque to succeed */
   
   /*
    * 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) */
           u_short         va_mode;        /* files access mode and type */
           short           va_nlink;       /* number of references to file */
           uid_t           va_uid;         /* owner user id */
           gid_t           va_gid;         /* owner group id */
           dev_t           va_fsid;        /* filesystem id */
           long            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 */
   #define VA_SYNC         0x04            /* O_SYNC truncation */
   
   /*
    * Flags for ioflag. (high 16 bits used to ask for read-ahead and
    * help with write clustering)
    * NB: IO_NDELAY and IO_DIRECT are linked to fcntl.h
    */
   #define IO_UNIT         0x0001          /* do I/O as atomic unit */
   #define IO_APPEND       0x0002          /* append write to end */
   #define IO_NDELAY       0x0004          /* FNDELAY flag set in file table */
   #define IO_NODELOCKED   0x0008          /* underlying node already locked */
   #define IO_ASYNC        0x0010          /* bawrite rather then bdwrite */
   #define IO_VMIO         0x0020          /* data already in VMIO space */
   #define IO_INVAL        0x0040          /* invalidate after I/O */
   #define IO_SYNC         0x0080          /* do I/O synchronously */
   #define IO_DIRECT       0x0100          /* attempt to bypass buffer cache */
   #define IO_EXT          0x0400          /* operate on external attributes */
   #define IO_NORMAL       0x0800          /* operate on regular data */
   #define IO_NOMACCHECK   0x1000          /* MAC checks unnecessary */
   #define IO_BUFLOCKED    0x2000          /* ffs flag; indir buf is locked */
   #define IO_RANGELOCKED  0x4000          /* range locked */
   
   #define IO_SEQMAX       0x7F            /* seq heuristic max value */
   #define IO_SEQSHIFT     16              /* seq heuristic in upper 16 bits */
   
   /*
    * Flags for accmode_t.
    */
   #define VEXEC                   000000000100 /* execute/search permission */
   #define VWRITE                  000000000200 /* write permission */
   #define VREAD                   000000000400 /* read permission */
   #define VADMIN                  000000010000 /* being the file owner */
   #define VAPPEND                 000000040000 /* permission to write/append */
   /*
    * VEXPLICIT_DENY makes VOP_ACCESSX(9) return EPERM or EACCES only
    * if permission was denied explicitly, by a "deny" rule in NFSv4 ACL,
    * and 0 otherwise.  This never happens with ordinary unix access rights
    * or POSIX.1e ACLs.  Obviously, VEXPLICIT_DENY must be OR-ed with
    * some other V* constant.
    */
   #define VEXPLICIT_DENY          000000100000
   #define VREAD_NAMED_ATTRS       000000200000 /* not used */
   #define VWRITE_NAMED_ATTRS      000000400000 /* not used */
   #define VDELETE_CHILD           000001000000
   #define VREAD_ATTRIBUTES        000002000000 /* permission to stat(2) */
   #define VWRITE_ATTRIBUTES       000004000000 /* change {m,c,a}time */
   #define VDELETE                 000010000000
   #define VREAD_ACL               000020000000 /* read ACL and file mode */
   #define VWRITE_ACL              000040000000 /* change ACL and/or file mode */
   #define VWRITE_OWNER            000100000000 /* change file owner */
   #define VSYNCHRONIZE            000200000000 /* not used */
   
   /*
    * Permissions that were traditionally granted only to the file owner.
    */
   #define VADMIN_PERMS    (VADMIN | VWRITE_ATTRIBUTES | VWRITE_ACL | \
       VWRITE_OWNER)
   
   /*
    * Permissions that were traditionally granted to everyone.
    */
   #define VSTAT_PERMS     (VREAD_ATTRIBUTES | VREAD_ACL)
   
   /*
    * Permissions that allow to change the state of the file in any way.
    */
   #define VMODIFY_PERMS   (VWRITE | VAPPEND | VADMIN_PERMS | VDELETE_CHILD | \
       VDELETE)
   
   /*
    * Token indicating no attribute value yet assigned.
    */
   #define VNOVAL  (-1)
   
   /*
    * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
    */
   #define VLKTIMEOUT      (hz / 20 + 1)
   
   #ifdef _KERNEL
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_VNODE);
   #endif
   
   /*
    * Convert between vnode types and inode formats (since POSIX.1
    * defines mode word of stat structure in terms of inode formats).
    */
   extern enum vtype       iftovt_tab[];
   extern 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 closure */
   #define WRITECLOSE      0x0004  /* vflush: only close writable files */
   #define EARLYFLUSH      0x0008  /* vflush: early call for ffs_flushfiles */
   #define V_SAVE          0x0001  /* vinvalbuf: sync file first */
   #define V_ALT           0x0002  /* vinvalbuf: invalidate only alternate bufs */
   #define V_NORMAL        0x0004  /* vinvalbuf: invalidate only regular bufs */
   #define V_CLEANONLY     0x0008  /* vinvalbuf: invalidate only clean bufs */
   #define REVOKEALL       0x0001  /* vop_revoke: revoke all aliases */
   #define V_WAIT          0x0001  /* vn_start_write: sleep for suspend */
   #define V_NOWAIT        0x0002  /* vn_start_write: don't sleep for suspend */
   #define V_XSLEEP        0x0004  /* vn_start_write: just return after sleep */
   #define V_MNTREF        0x0010  /* vn_start_write: mp is already ref-ed */
   
   #define VR_START_WRITE  0x0001  /* vfs_write_resume: start write atomically */
   #define VR_NO_SUSPCLR   0x0002  /* vfs_write_resume: do not clear suspension */
   
   #define VS_SKIP_UNMOUNT 0x0001  /* vfs_write_suspend: fail if the
                                      filesystem is being unmounted */
   
   #define VREF(vp)        vref(vp)
   
   #ifdef DIAGNOSTIC
   #define VATTR_NULL(vap) vattr_null(vap)
   #else
   #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
   #endif /* DIAGNOSTIC */
   
   #define NULLVP  ((struct vnode *)NULL)
   
   /*
    * Global vnode data.
    */
   extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
   extern  struct mount *rootdevmp;        /* "/dev" mount */
   extern  int async_io_version;           /* 0 or POSIX version of AIO i'face */
   extern  int desiredvnodes;              /* number of vnodes desired */
   extern  struct uma_zone *namei_zone;
   extern  struct vattr va_null;           /* predefined null vattr structure */
   
   #define VI_LOCK(vp)     mtx_lock(&(vp)->v_interlock)
   #define VI_LOCK_FLAGS(vp, flags) mtx_lock_flags(&(vp)->v_interlock, (flags))
   #define VI_TRYLOCK(vp)  mtx_trylock(&(vp)->v_interlock)
   #define VI_UNLOCK(vp)   mtx_unlock(&(vp)->v_interlock)
   #define VI_MTX(vp)      (&(vp)->v_interlock)
   
   #define VN_LOCK_AREC(vp)        lockallowrecurse((vp)->v_vnlock)
   #define VN_LOCK_ASHARE(vp)      lockallowshare((vp)->v_vnlock)
   #define VN_LOCK_DSHARE(vp)      lockdisableshare((vp)->v_vnlock)
   
   #endif /* _KERNEL */
   
   /*
    * Mods for extensibility.
    */
   
   /*
    * Flags for vdesc_flags:
    */
   #define VDESC_MAX_VPS           16
   /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
   #define VDESC_VP0_WILLRELE      0x0001
   #define VDESC_VP1_WILLRELE      0x0002
   #define VDESC_VP2_WILLRELE      0x0004
   #define VDESC_VP3_WILLRELE      0x0008
   #define VDESC_NOMAP_VPP         0x0100
   #define VDESC_VPP_WILLRELE      0x0200
   
   /*
    * 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 */
   };
   
   typedef int vop_bypass_t(struct vop_generic_args *);
   
   /*
    * 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 {
           char    *vdesc_name;            /* a readable name for debugging */
           int      vdesc_flags;           /* VDESC_* flags */
           vop_bypass_t    *vdesc_call;    /* Function to call */
   
           /*
            * 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.
            */
           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_thread_offset;    /* thread location, if any */
           int     vdesc_componentname_offset; /* if any */
   };
   
   #ifdef _KERNEL
   /*
    * A list of all the operation descs.
    */
   extern struct vnodeop_desc *vnodeop_descs[];
   
   #define VOPARG_OFFSETOF(s_type, field)  __offsetof(s_type, field)
   #define VOPARG_OFFSETTO(s_type, s_offset, struct_p) \
       ((s_type)(((char*)(struct_p)) + (s_offset)))
   
   
   #ifdef DEBUG_VFS_LOCKS
   /*
    * Support code to aid in debugging VFS locking problems.  Not totally
    * reliable since if the thread sleeps between changing the lock
    * state and checking it with the assert, some other thread could
    * change the state.  They are good enough for debugging a single
    * filesystem using a single-threaded test.
    */
   void    assert_vi_locked(struct vnode *vp, const char *str);
   void    assert_vi_unlocked(struct vnode *vp, const char *str);
   void    assert_vop_elocked(struct vnode *vp, const char *str);
   #if 0
   void    assert_vop_elocked_other(struct vnode *vp, const char *str);
   #endif
   void    assert_vop_locked(struct vnode *vp, const char *str);
   #if 0
   voi0    assert_vop_slocked(struct vnode *vp, const char *str);
   #endif
   void    assert_vop_unlocked(struct vnode *vp, const char *str);
   
   #define ASSERT_VI_LOCKED(vp, str)       assert_vi_locked((vp), (str))
   #define ASSERT_VI_UNLOCKED(vp, str)     assert_vi_unlocked((vp), (str))
   #define ASSERT_VOP_ELOCKED(vp, str)     assert_vop_elocked((vp), (str))
   #if 0
   #define ASSERT_VOP_ELOCKED_OTHER(vp, str) assert_vop_locked_other((vp), (str))
   #endif
   #define ASSERT_VOP_LOCKED(vp, str)      assert_vop_locked((vp), (str))
   #if 0
   #define ASSERT_VOP_SLOCKED(vp, str)     assert_vop_slocked((vp), (str))
   #endif
   #define ASSERT_VOP_UNLOCKED(vp, str)    assert_vop_unlocked((vp), (str))
   
   #else /* !DEBUG_VFS_LOCKS */
   
   #define ASSERT_VI_LOCKED(vp, str)       ((void)0)
   #define ASSERT_VI_UNLOCKED(vp, str)     ((void)0)
   #define ASSERT_VOP_ELOCKED(vp, str)     ((void)0)
   #if 0
   #define ASSERT_VOP_ELOCKED_OTHER(vp, str)
   #endif
   #define ASSERT_VOP_LOCKED(vp, str)      ((void)0)
   #if 0
   #define ASSERT_VOP_SLOCKED(vp, str)
   #endif
   #define ASSERT_VOP_UNLOCKED(vp, str)    ((void)0)
   #endif /* DEBUG_VFS_LOCKS */
   
   
   /*
    * This call works for vnodes in the kernel.
    */
   #define VCALL(c) ((c)->a_desc->vdesc_call(c))
   
   #define DOINGASYNC(vp)                                          \
           (((vp)->v_mount->mnt_kern_flag & MNTK_ASYNC) != 0 &&    \
            ((curthread->td_pflags & TDP_SYNCIO) == 0))
   
   /*
    * VMIO support inline
    */
   
   extern int vmiodirenable;
   
   static __inline int
   vn_canvmio(struct vnode *vp)
   {
         if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
                   return(TRUE);
           return(FALSE);
   }
   
   /*
    * Finally, include the default set of vnode operations.
    */
   #include "vnode_if.h"
   
   /* vn_open_flags */
   #define VN_OPEN_NOAUDIT         0x00000001
   #define VN_OPEN_NOCAPCHECK      0x00000002
   #define VN_OPEN_NAMECACHE       0x00000004
   
   /*
    * Public vnode manipulation functions.
    */
   struct componentname;
   struct file;
   struct mount;
   struct nameidata;
   struct ostat;
   struct thread;
   struct proc;
   struct stat;
   struct nstat;
   struct ucred;
   struct uio;
   struct vattr;
   struct vnode;
   
   typedef int (*vn_get_ino_t)(struct mount *, void *, int, struct vnode **);
   
   /* cache_* may belong in namei.h. */
   void    cache_changesize(int newhashsize);
   #define cache_enter(dvp, vp, cnp)                                       \
           cache_enter_time(dvp, vp, cnp, NULL, NULL)
   void    cache_enter_time(struct vnode *dvp, struct vnode *vp,
               struct componentname *cnp, struct timespec *tsp,
               struct timespec *dtsp);
   int     cache_lookup(struct vnode *dvp, struct vnode **vpp,
               struct componentname *cnp, struct timespec *tsp, int *ticksp);
   void    cache_purge(struct vnode *vp);
   void    cache_purge_negative(struct vnode *vp);
   void    cache_purgevfs(struct mount *mp);
   int     change_dir(struct vnode *vp, struct thread *td);
   int     change_root(struct vnode *vp, struct thread *td);
   void    cvtstat(struct stat *st, struct ostat *ost);
   void    cvtnstat(struct stat *sb, struct nstat *nsb);
   int     getnewvnode(const char *tag, struct mount *mp, struct vop_vector *vops,
               struct vnode **vpp);
   void    getnewvnode_reserve(u_int count);
   void    getnewvnode_drop_reserve(void);
   int     insmntque1(struct vnode *vp, struct mount *mp,
               void (*dtr)(struct vnode *, void *), void *dtr_arg);
   int     insmntque(struct vnode *vp, struct mount *mp);
   u_quad_t init_va_filerev(void);
   int     speedup_syncer(void);
   int     vn_vptocnp(struct vnode **vp, struct ucred *cred, char *buf,
               u_int *buflen);
   #define textvp_fullpath(p, rb, rfb) \
           vn_fullpath(FIRST_THREAD_IN_PROC(p), (p)->p_textvp, rb, rfb)
   int     vn_fullpath(struct thread *td, struct vnode *vn,
               char **retbuf, char **freebuf);
   int     vn_fullpath_global(struct thread *td, struct vnode *vn,
               char **retbuf, char **freebuf);
   struct vnode *
           vn_dir_dd_ino(struct vnode *vp);
   int     vn_commname(struct vnode *vn, char *buf, u_int buflen);
   int     vn_path_to_global_path(struct thread *td, struct vnode *vp,
               char *path, u_int pathlen);
   int     vaccess(enum vtype type, mode_t file_mode, uid_t file_uid,
               gid_t file_gid, accmode_t accmode, struct ucred *cred,
               int *privused);
   int     vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid,
               struct acl *aclp, accmode_t accmode, struct ucred *cred,
               int *privused);
   int     vaccess_acl_posix1e(enum vtype type, uid_t file_uid,
               gid_t file_gid, struct acl *acl, accmode_t accmode,
               struct ucred *cred, int *privused);
   void    vattr_null(struct vattr *vap);
   int     vcount(struct vnode *vp);
   void    vdrop(struct vnode *);
   void    vdropl(struct vnode *);
   int     vflush(struct mount *mp, int rootrefs, int flags, struct thread *td);
   int     vget(struct vnode *vp, int lockflag, struct thread *td);
   void    vgone(struct vnode *vp);
   void    vhold(struct vnode *);
   void    vholdl(struct vnode *);
   void    vinactive(struct vnode *, struct thread *);
   int     vinvalbuf(struct vnode *vp, int save, int slpflag, int slptimeo);
   int     vtruncbuf(struct vnode *vp, struct ucred *cred, off_t length,
               int blksize);
   void    vunref(struct vnode *);
   void    vn_printf(struct vnode *vp, const char *fmt, ...) __printflike(2,3);
   #define vprint(label, vp) vn_printf((vp), "%s\n", (label))
   int     vrecycle(struct vnode *vp);
   int     vn_bmap_seekhole(struct vnode *vp, u_long cmd, off_t *off,
               struct ucred *cred);
   int     vn_close(struct vnode *vp,
               int flags, struct ucred *file_cred, struct thread *td);
   void    vn_finished_write(struct mount *mp);
   void    vn_finished_secondary_write(struct mount *mp);
   int     vn_isdisk(struct vnode *vp, int *errp);
   int     _vn_lock(struct vnode *vp, int flags, char *file, int line);
   #define vn_lock(vp, flags) _vn_lock(vp, flags, __FILE__, __LINE__)
   int     vn_open(struct nameidata *ndp, int *flagp, int cmode, struct file *fp);
   int     vn_open_cred(struct nameidata *ndp, int *flagp, int cmode,
               u_int vn_open_flags, struct ucred *cred, struct file *fp);
   int     vn_open_vnode(struct vnode *vp, int fmode, struct ucred *cred,
               struct thread *td, struct file *fp);
   void    vn_pages_remove(struct vnode *vp, vm_pindex_t start, vm_pindex_t end);
   int     vn_pollrecord(struct vnode *vp, struct thread *p, int events);
   int     vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base,
               int len, off_t offset, enum uio_seg segflg, int ioflg,
               struct ucred *active_cred, struct ucred *file_cred, ssize_t *aresid,
               struct thread *td);
   int     vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, void *base,
               size_t len, off_t offset, enum uio_seg segflg, int ioflg,
               struct ucred *active_cred, struct ucred *file_cred, size_t *aresid,
               struct thread *td);
   int     vn_rlimit_fsize(const struct vnode *vn, const struct uio *uio,
               const struct thread *td);
   int     vn_stat(struct vnode *vp, struct stat *sb, struct ucred *active_cred,
               struct ucred *file_cred, struct thread *td);
   int     vn_start_write(struct vnode *vp, struct mount **mpp, int flags);
   int     vn_start_secondary_write(struct vnode *vp, struct mount **mpp,
               int flags);
   int     vn_writechk(struct vnode *vp);
   int     vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace,
               const char *attrname, int *buflen, char *buf, struct thread *td);
   int     vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace,
               const char *attrname, int buflen, char *buf, struct thread *td);
   int     vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
               const char *attrname, struct thread *td);
   int     vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags,
               struct vnode **rvp);
   int     vn_vget_ino_gen(struct vnode *vp, vn_get_ino_t alloc,
               void *alloc_arg, int lkflags, struct vnode **rvp);
   int     vn_utimes_perm(struct vnode *vp, struct vattr *vap,
               struct ucred *cred, struct thread *td);
   
   int     vn_io_fault_uiomove(char *data, int xfersize, struct uio *uio);
   int     vn_io_fault_pgmove(vm_page_t ma[], vm_offset_t offset, int xfersize,
               struct uio *uio);
   
   #define vn_rangelock_unlock(vp, cookie)                                 \
           rangelock_unlock(&(vp)->v_rl, (cookie), VI_MTX(vp))
   #define vn_rangelock_unlock_range(vp, cookie, start, end)               \
           rangelock_unlock_range(&(vp)->v_rl, (cookie), (start), (end),   \
               VI_MTX(vp))
   #define vn_rangelock_rlock(vp, start, end)                              \
           rangelock_rlock(&(vp)->v_rl, (start), (end), VI_MTX(vp))
   #define vn_rangelock_wlock(vp, start, end)                              \
           rangelock_wlock(&(vp)->v_rl, (start), (end), VI_MTX(vp))
   
   int     vfs_cache_lookup(struct vop_lookup_args *ap);
   void    vfs_timestamp(struct timespec *);
   void    vfs_write_resume(struct mount *mp, int flags);
   int     vfs_write_suspend(struct mount *mp, int flags);
   int     vfs_write_suspend_umnt(struct mount *mp);
   int     vop_stdbmap(struct vop_bmap_args *);
   int     vop_stdfsync(struct vop_fsync_args *);
   int     vop_stdgetwritemount(struct vop_getwritemount_args *);
   int     vop_stdgetpages(struct vop_getpages_args *);
   int     vop_stdinactive(struct vop_inactive_args *);
   int     vop_stdislocked(struct vop_islocked_args *);
   int     vop_stdkqfilter(struct vop_kqfilter_args *);
   int     vop_stdlock(struct vop_lock1_args *);
   int     vop_stdputpages(struct vop_putpages_args *);
   int     vop_stdunlock(struct vop_unlock_args *);
   int     vop_nopoll(struct vop_poll_args *);
   int     vop_stdaccess(struct vop_access_args *ap);
   int     vop_stdaccessx(struct vop_accessx_args *ap);
   int     vop_stdadvise(struct vop_advise_args *ap);
   int     vop_stdadvlock(struct vop_advlock_args *ap);
   int     vop_stdadvlockasync(struct vop_advlockasync_args *ap);
   int     vop_stdadvlockpurge(struct vop_advlockpurge_args *ap);
   int     vop_stdallocate(struct vop_allocate_args *ap);
   int     vop_stdpathconf(struct vop_pathconf_args *);
   int     vop_stdpoll(struct vop_poll_args *);
   int     vop_stdvptocnp(struct vop_vptocnp_args *ap);
   int     vop_stdvptofh(struct vop_vptofh_args *ap);
   int     vop_stdunp_bind(struct vop_unp_bind_args *ap);
   int     vop_stdunp_connect(struct vop_unp_connect_args *ap);
   int     vop_stdunp_detach(struct vop_unp_detach_args *ap);
   int     vop_eopnotsupp(struct vop_generic_args *ap);
   int     vop_ebadf(struct vop_generic_args *ap);
   int     vop_einval(struct vop_generic_args *ap);
   int     vop_enoent(struct vop_generic_args *ap);
   int     vop_enotty(struct vop_generic_args *ap);
   int     vop_null(struct vop_generic_args *ap);
   int     vop_panic(struct vop_generic_args *ap);
   int     dead_poll(struct vop_poll_args *ap);
   int     dead_read(struct vop_read_args *ap);
   int     dead_write(struct vop_write_args *ap);
   
   /* These are called from within the actual VOPS. */
   void    vop_close_post(void *a, int rc);
   void    vop_create_post(void *a, int rc);
   void    vop_deleteextattr_post(void *a, int rc);
   void    vop_link_post(void *a, int rc);
   void    vop_lock_pre(void *a);
   void    vop_lock_post(void *a, int rc);
   void    vop_lookup_post(void *a, int rc);
   void    vop_lookup_pre(void *a);
   void    vop_mkdir_post(void *a, int rc);
   void    vop_mknod_post(void *a, int rc);
   void    vop_open_post(void *a, int rc);
   void    vop_read_post(void *a, int rc);
   void    vop_readdir_post(void *a, int rc);
   void    vop_reclaim_post(void *a, int rc);
   void    vop_remove_post(void *a, int rc);
   void    vop_rename_post(void *a, int rc);
   void    vop_rename_pre(void *a);
   void    vop_rmdir_post(void *a, int rc);
   void    vop_setattr_post(void *a, int rc);
   void    vop_setextattr_post(void *a, int rc);
   void    vop_strategy_pre(void *a);
   void    vop_symlink_post(void *a, int rc);
   void    vop_unlock_post(void *a, int rc);
   void    vop_unlock_pre(void *a);
   
   void    vop_rename_fail(struct vop_rename_args *ap);
   
   #define VOP_WRITE_PRE(ap)                                               \
           struct vattr va;                                                \
           int error;                                                      \
           off_t osize, ooffset, noffset;                                  \
                                                                           \
           osize = ooffset = noffset = 0;                                  \
           if (!VN_KNLIST_EMPTY((ap)->a_vp)) {                             \
                   error = VOP_GETATTR((ap)->a_vp, &va, (ap)->a_cred);     \
                   if (error)                                              \
                           return (error);                                 \
                   ooffset = (ap)->a_uio->uio_offset;                      \
                   osize = (off_t)va.va_size;                              \
           }
   
   #define VOP_WRITE_POST(ap, ret)                                         \
           noffset = (ap)->a_uio->uio_offset;                              \
           if (noffset > ooffset && !VN_KNLIST_EMPTY((ap)->a_vp)) {        \
                   VFS_KNOTE_LOCKED((ap)->a_vp, NOTE_WRITE                 \
                       | (noffset > osize ? NOTE_EXTEND : 0));             \
           }
   
   #define VOP_LOCK(vp, flags) VOP_LOCK1(vp, flags, __FILE__, __LINE__)
   
   
   void    vput(struct vnode *vp);
   void    vrele(struct vnode *vp);
   void    vref(struct vnode *vp);
   int     vrefcnt(struct vnode *vp);
   void    v_addpollinfo(struct vnode *vp);
   
   int vnode_create_vobject(struct vnode *vp, off_t size, struct thread *td);
   void vnode_destroy_vobject(struct vnode *vp);
   
   extern struct vop_vector fifo_specops;
   extern struct vop_vector dead_vnodeops;
   extern struct vop_vector default_vnodeops;
   
   #define VOP_PANIC       ((void*)(uintptr_t)vop_panic)
   #define VOP_NULL        ((void*)(uintptr_t)vop_null)
   #define VOP_EBADF       ((void*)(uintptr_t)vop_ebadf)
   #define VOP_ENOTTY      ((void*)(uintptr_t)vop_enotty)
   #define VOP_EINVAL      ((void*)(uintptr_t)vop_einval)
   #define VOP_ENOENT      ((void*)(uintptr_t)vop_enoent)
   #define VOP_EOPNOTSUPP  ((void*)(uintptr_t)vop_eopnotsupp)
   
   /* fifo_vnops.c */
   int     fifo_printinfo(struct vnode *);
   
   /* vfs_hash.c */
   typedef int vfs_hash_cmp_t(struct vnode *vp, void *arg);
   
   void vfs_hash_changesize(int newhashsize);
   int vfs_hash_get(const struct mount *mp, u_int hash, int flags,
       struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
   u_int vfs_hash_index(struct vnode *vp);
   int vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td,
       struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
   void vfs_hash_ref(const struct mount *mp, u_int hash, struct thread *td,
       struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
   void vfs_hash_rehash(struct vnode *vp, u_int hash);
   void vfs_hash_remove(struct vnode *vp);
   
   int vfs_kqfilter(struct vop_kqfilter_args *);
   void vfs_mark_atime(struct vnode *vp, struct ucred *cred);
   struct dirent;
   int vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off);
   
   int vfs_unixify_accmode(accmode_t *accmode);
   
   void vfs_unp_reclaim(struct vnode *vp);
   
   int setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode);
   int setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid,
       gid_t gid);
   int vn_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
       struct thread *td);
   int vn_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
       struct thread *td);
   
   #endif /* _KERNEL */
   
   #endif /* !_SYS_VNODE_H_ */

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