The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/vnode.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)vnode.h     8.7 (Berkeley) 2/4/94
   32  * $FreeBSD: stable/12/sys/sys/vnode.h 346288 2019-04-16 17:55:54Z kib $
   33  */
   34 
   35 #ifndef _SYS_VNODE_H_
   36 #define _SYS_VNODE_H_
   37 
   38 #include <sys/bufobj.h>
   39 #include <sys/queue.h>
   40 #include <sys/lock.h>
   41 #include <sys/lockmgr.h>
   42 #include <sys/mutex.h>
   43 #include <sys/rangelock.h>
   44 #include <sys/selinfo.h>
   45 #include <sys/uio.h>
   46 #include <sys/acl.h>
   47 #include <sys/ktr.h>
   48 
   49 /*
   50  * The vnode is the focus of all file activity in UNIX.  There is a
   51  * unique vnode allocated for each active file, each current directory,
   52  * each mounted-on file, text file, and the root.
   53  */
   54 
   55 /*
   56  * Vnode types.  VNON means no type.
   57  */
   58 enum vtype      { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD,
   59                   VMARKER };
   60 
   61 /*
   62  * Each underlying filesystem allocates its own private area and hangs
   63  * it from v_data.  If non-null, this area is freed in getnewvnode().
   64  */
   65 
   66 struct namecache;
   67 
   68 struct vpollinfo {
   69         struct  mtx vpi_lock;           /* lock to protect below */
   70         struct  selinfo vpi_selinfo;    /* identity of poller(s) */
   71         short   vpi_events;             /* what they are looking for */
   72         short   vpi_revents;            /* what has happened */
   73 };
   74 
   75 /*
   76  * Reading or writing any of these items requires holding the appropriate lock.
   77  *
   78  * Lock reference:
   79  *      c - namecache mutex
   80  *      i - interlock
   81  *      l - mp mnt_listmtx or freelist mutex
   82  *      I - updated with atomics, 0->1 and 1->0 transitions with interlock held
   83  *      m - mount point interlock
   84  *      p - pollinfo lock
   85  *      u - Only a reference to the vnode is needed to read.
   86  *      v - vnode lock
   87  *
   88  * Vnodes may be found on many lists.  The general way to deal with operating
   89  * on a vnode that is on a list is:
   90  *      1) Lock the list and find the vnode.
   91  *      2) Lock interlock so that the vnode does not go away.
   92  *      3) Unlock the list to avoid lock order reversals.
   93  *      4) vget with LK_INTERLOCK and check for ENOENT, or
   94  *      5) Check for DOOMED if the vnode lock is not required.
   95  *      6) Perform your operation, then vput().
   96  */
   97 
   98 #if defined(_KERNEL) || defined(_KVM_VNODE)
   99 
  100 struct vnode {
  101         /*
  102          * Fields which define the identity of the vnode.  These fields are
  103          * owned by the filesystem (XXX: and vgone() ?)
  104          */
  105         const char *v_tag;                      /* u type of underlying data */
  106         struct  vop_vector *v_op;               /* u vnode operations vector */
  107         void    *v_data;                        /* u private data for fs */
  108 
  109         /*
  110          * Filesystem instance stuff
  111          */
  112         struct  mount *v_mount;                 /* u ptr to vfs we are in */
  113         TAILQ_ENTRY(vnode) v_nmntvnodes;        /* m vnodes for mount point */
  114 
  115         /*
  116          * Type specific fields, only one applies to any given vnode.
  117          */
  118         union {
  119                 struct mount    *v_mountedhere; /* v ptr to mountpoint (VDIR) */
  120                 struct unpcb    *v_unpcb;       /* v unix domain net (VSOCK) */
  121                 struct cdev     *v_rdev;        /* v device (VCHR, VBLK) */
  122                 struct fifoinfo *v_fifoinfo;    /* v fifo (VFIFO) */
  123         };
  124 
  125         /*
  126          * vfs_hash: (mount + inode) -> vnode hash.  The hash value
  127          * itself is grouped with other int fields, to avoid padding.
  128          */
  129         LIST_ENTRY(vnode)       v_hashlist;
  130 
  131         /*
  132          * VFS_namecache stuff
  133          */
  134         LIST_HEAD(, namecache) v_cache_src;     /* c Cache entries from us */
  135         TAILQ_HEAD(, namecache) v_cache_dst;    /* c Cache entries to us */
  136         struct namecache *v_cache_dd;           /* c Cache entry for .. vnode */
  137 
  138         /*
  139          * Locking
  140          */
  141         struct  lock v_lock;                    /* u (if fs don't have one) */
  142         struct  mtx v_interlock;                /* lock for "i" things */
  143         struct  lock *v_vnlock;                 /* u pointer to vnode lock */
  144 
  145         /*
  146          * The machinery of being a vnode
  147          */
  148         TAILQ_ENTRY(vnode) v_actfreelist;       /* l vnode active/free lists */
  149         struct bufobj   v_bufobj;               /* * Buffer cache object */
  150 
  151         /*
  152          * Hooks for various subsystems and features.
  153          */
  154         struct vpollinfo *v_pollinfo;           /* i Poll events, p for *v_pi */
  155         struct label *v_label;                  /* MAC label for vnode */
  156         struct lockf *v_lockf;          /* Byte-level advisory lock list */
  157         struct rangelock v_rl;                  /* Byte-range lock */
  158 
  159         /*
  160          * clustering stuff
  161          */
  162         daddr_t v_cstart;                       /* v start block of cluster */
  163         daddr_t v_lasta;                        /* v last allocation  */
  164         daddr_t v_lastw;                        /* v last write  */
  165         int     v_clen;                         /* v length of cur. cluster */
  166 
  167         u_int   v_holdcnt;                      /* I prevents recycling. */
  168         u_int   v_usecount;                     /* I ref count of users */
  169         u_int   v_iflag;                        /* i vnode flags (see below) */
  170         u_int   v_vflag;                        /* v vnode flags */
  171         u_int   v_mflag;                        /* l mnt-specific vnode flags */
  172         int     v_writecount;                   /* v ref count of writers */
  173         u_int   v_hash;
  174         enum    vtype v_type;                   /* u vnode type */
  175 };
  176 
  177 #endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
  178 
  179 #define bo2vnode(bo)    __containerof((bo), struct vnode, v_bufobj)
  180 
  181 /* XXX: These are temporary to avoid a source sweep at this time */
  182 #define v_object        v_bufobj.bo_object
  183 
  184 /*
  185  * Userland version of struct vnode, for sysctl.
  186  */
  187 struct xvnode {
  188         size_t  xv_size;                        /* sizeof(struct xvnode) */
  189         void    *xv_vnode;                      /* address of real vnode */
  190         u_long  xv_flag;                        /* vnode vflags */
  191         int     xv_usecount;                    /* reference count of users */
  192         int     xv_writecount;                  /* reference count of writers */
  193         int     xv_holdcnt;                     /* page & buffer references */
  194         u_long  xv_id;                          /* capability identifier */
  195         void    *xv_mount;                      /* address of parent mount */
  196         long    xv_numoutput;                   /* num of writes in progress */
  197         enum    vtype xv_type;                  /* vnode type */
  198         union {
  199                 void    *xvu_socket;            /* unpcb, if VSOCK */
  200                 void    *xvu_fifo;              /* fifo, if VFIFO */
  201                 dev_t   xvu_rdev;               /* maj/min, if VBLK/VCHR */
  202                 struct {
  203                         dev_t   xvu_dev;        /* device, if VDIR/VREG/VLNK */
  204                         ino_t   xvu_ino;        /* id, if VDIR/VREG/VLNK */
  205                 } xv_uns;
  206         } xv_un;
  207 };
  208 #define xv_socket       xv_un.xvu_socket
  209 #define xv_fifo         xv_un.xvu_fifo
  210 #define xv_rdev         xv_un.xvu_rdev
  211 #define xv_dev          xv_un.xv_uns.xvu_dev
  212 #define xv_ino          xv_un.xv_uns.xvu_ino
  213 
  214 /* We don't need to lock the knlist */
  215 #define VN_KNLIST_EMPTY(vp) ((vp)->v_pollinfo == NULL ||        \
  216             KNLIST_EMPTY(&(vp)->v_pollinfo->vpi_selinfo.si_note))
  217 
  218 #define VN_KNOTE(vp, b, a)                                      \
  219         do {                                                    \
  220                 if (!VN_KNLIST_EMPTY(vp))                       \
  221                         KNOTE(&vp->v_pollinfo->vpi_selinfo.si_note, (b), \
  222                             (a) | KNF_NOKQLOCK);                \
  223         } while (0)
  224 #define VN_KNOTE_LOCKED(vp, b)          VN_KNOTE(vp, b, KNF_LISTLOCKED)
  225 #define VN_KNOTE_UNLOCKED(vp, b)        VN_KNOTE(vp, b, 0)
  226 
  227 /*
  228  * Vnode flags.
  229  *      VI flags are protected by interlock and live in v_iflag
  230  *      VV flags are protected by the vnode lock and live in v_vflag
  231  *
  232  *      VI_DOOMED is doubly protected by the interlock and vnode lock.  Both
  233  *      are required for writing but the status may be checked with either.
  234  */
  235 #define VI_MOUNT        0x0020  /* Mount in progress */
  236 #define VI_DOOMED       0x0080  /* This vnode is being recycled */
  237 #define VI_FREE         0x0100  /* This vnode is on the freelist */
  238 #define VI_ACTIVE       0x0200  /* This vnode is on the active list */
  239 #define VI_DOINGINACT   0x0800  /* VOP_INACTIVE is in progress */
  240 #define VI_OWEINACT     0x1000  /* Need to call inactive */
  241 
  242 #define VV_ROOT         0x0001  /* root of its filesystem */
  243 #define VV_ISTTY        0x0002  /* vnode represents a tty */
  244 #define VV_NOSYNC       0x0004  /* unlinked, stop syncing */
  245 #define VV_ETERNALDEV   0x0008  /* device that is never destroyed */
  246 #define VV_CACHEDLABEL  0x0010  /* Vnode has valid cached MAC label */
  247 #define VV_TEXT         0x0020  /* vnode is a pure text prototype */
  248 #define VV_COPYONWRITE  0x0040  /* vnode is doing copy-on-write */
  249 #define VV_SYSTEM       0x0080  /* vnode being used by kernel */
  250 #define VV_PROCDEP      0x0100  /* vnode is process dependent */
  251 #define VV_NOKNOTE      0x0200  /* don't activate knotes on this vnode */
  252 #define VV_DELETED      0x0400  /* should be removed */
  253 #define VV_MD           0x0800  /* vnode backs the md device */
  254 #define VV_FORCEINSMQ   0x1000  /* force the insmntque to succeed */
  255 #define VV_READLINK     0x2000  /* fdescfs linux vnode */
  256 
  257 #define VMP_TMPMNTFREELIST      0x0001  /* Vnode is on mnt's tmp free list */
  258 
  259 /*
  260  * Vnode attributes.  A field value of VNOVAL represents a field whose value
  261  * is unavailable (getattr) or which is not to be changed (setattr).
  262  */
  263 struct vattr {
  264         enum vtype      va_type;        /* vnode type (for create) */
  265         u_short         va_mode;        /* files access mode and type */
  266         u_short         va_padding0;
  267         uid_t           va_uid;         /* owner user id */
  268         gid_t           va_gid;         /* owner group id */
  269         nlink_t         va_nlink;       /* number of references to file */
  270         dev_t           va_fsid;        /* filesystem id */
  271         ino_t           va_fileid;      /* file id */
  272         u_quad_t        va_size;        /* file size in bytes */
  273         long            va_blocksize;   /* blocksize preferred for i/o */
  274         struct timespec va_atime;       /* time of last access */
  275         struct timespec va_mtime;       /* time of last modification */
  276         struct timespec va_ctime;       /* time file changed */
  277         struct timespec va_birthtime;   /* time file created */
  278         u_long          va_gen;         /* generation number of file */
  279         u_long          va_flags;       /* flags defined for file */
  280         dev_t           va_rdev;        /* device the special file represents */
  281         u_quad_t        va_bytes;       /* bytes of disk space held by file */
  282         u_quad_t        va_filerev;     /* file modification number */
  283         u_int           va_vaflags;     /* operations flags, see below */
  284         long            va_spare;       /* remain quad aligned */
  285 };
  286 
  287 /*
  288  * Flags for va_vaflags.
  289  */
  290 #define VA_UTIMES_NULL  0x01            /* utimes argument was NULL */
  291 #define VA_EXCLUSIVE    0x02            /* exclusive create request */
  292 #define VA_SYNC         0x04            /* O_SYNC truncation */
  293 
  294 /*
  295  * Flags for ioflag. (high 16 bits used to ask for read-ahead and
  296  * help with write clustering)
  297  * NB: IO_NDELAY and IO_DIRECT are linked to fcntl.h
  298  */
  299 #define IO_UNIT         0x0001          /* do I/O as atomic unit */
  300 #define IO_APPEND       0x0002          /* append write to end */
  301 #define IO_NDELAY       0x0004          /* FNDELAY flag set in file table */
  302 #define IO_NODELOCKED   0x0008          /* underlying node already locked */
  303 #define IO_ASYNC        0x0010          /* bawrite rather then bdwrite */
  304 #define IO_VMIO         0x0020          /* data already in VMIO space */
  305 #define IO_INVAL        0x0040          /* invalidate after I/O */
  306 #define IO_SYNC         0x0080          /* do I/O synchronously */
  307 #define IO_DIRECT       0x0100          /* attempt to bypass buffer cache */
  308 #define IO_NOREUSE      0x0200          /* VMIO data won't be reused */
  309 #define IO_EXT          0x0400          /* operate on external attributes */
  310 #define IO_NORMAL       0x0800          /* operate on regular data */
  311 #define IO_NOMACCHECK   0x1000          /* MAC checks unnecessary */
  312 #define IO_BUFLOCKED    0x2000          /* ffs flag; indir buf is locked */
  313 #define IO_RANGELOCKED  0x4000          /* range locked */
  314 
  315 #define IO_SEQMAX       0x7F            /* seq heuristic max value */
  316 #define IO_SEQSHIFT     16              /* seq heuristic in upper 16 bits */
  317 
  318 /*
  319  * Flags for accmode_t.
  320  */
  321 #define VEXEC                   000000000100 /* execute/search permission */
  322 #define VWRITE                  000000000200 /* write permission */
  323 #define VREAD                   000000000400 /* read permission */
  324 #define VADMIN                  000000010000 /* being the file owner */
  325 #define VAPPEND                 000000040000 /* permission to write/append */
  326 /*
  327  * VEXPLICIT_DENY makes VOP_ACCESSX(9) return EPERM or EACCES only
  328  * if permission was denied explicitly, by a "deny" rule in NFSv4 ACL,
  329  * and 0 otherwise.  This never happens with ordinary unix access rights
  330  * or POSIX.1e ACLs.  Obviously, VEXPLICIT_DENY must be OR-ed with
  331  * some other V* constant.
  332  */
  333 #define VEXPLICIT_DENY          000000100000
  334 #define VREAD_NAMED_ATTRS       000000200000 /* not used */
  335 #define VWRITE_NAMED_ATTRS      000000400000 /* not used */
  336 #define VDELETE_CHILD           000001000000
  337 #define VREAD_ATTRIBUTES        000002000000 /* permission to stat(2) */
  338 #define VWRITE_ATTRIBUTES       000004000000 /* change {m,c,a}time */
  339 #define VDELETE                 000010000000
  340 #define VREAD_ACL               000020000000 /* read ACL and file mode */
  341 #define VWRITE_ACL              000040000000 /* change ACL and/or file mode */
  342 #define VWRITE_OWNER            000100000000 /* change file owner */
  343 #define VSYNCHRONIZE            000200000000 /* not used */
  344 #define VCREAT                  000400000000 /* creating new file */
  345 #define VVERIFY                 001000000000 /* verification required */
  346 
  347 /*
  348  * Permissions that were traditionally granted only to the file owner.
  349  */
  350 #define VADMIN_PERMS    (VADMIN | VWRITE_ATTRIBUTES | VWRITE_ACL | \
  351     VWRITE_OWNER)
  352 
  353 /*
  354  * Permissions that were traditionally granted to everyone.
  355  */
  356 #define VSTAT_PERMS     (VREAD_ATTRIBUTES | VREAD_ACL)
  357 
  358 /*
  359  * Permissions that allow to change the state of the file in any way.
  360  */
  361 #define VMODIFY_PERMS   (VWRITE | VAPPEND | VADMIN_PERMS | VDELETE_CHILD | \
  362     VDELETE)
  363 
  364 /*
  365  * Token indicating no attribute value yet assigned.
  366  */
  367 #define VNOVAL  (-1)
  368 
  369 /*
  370  * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
  371  */
  372 #define VLKTIMEOUT      (hz / 20 + 1)
  373 
  374 #ifdef _KERNEL
  375 
  376 #ifdef MALLOC_DECLARE
  377 MALLOC_DECLARE(M_VNODE);
  378 #endif
  379 
  380 extern u_int ncsizefactor;
  381 
  382 /*
  383  * Convert between vnode types and inode formats (since POSIX.1
  384  * defines mode word of stat structure in terms of inode formats).
  385  */
  386 extern enum vtype       iftovt_tab[];
  387 extern int              vttoif_tab[];
  388 #define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
  389 #define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
  390 #define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))
  391 
  392 /*
  393  * Flags to various vnode functions.
  394  */
  395 #define SKIPSYSTEM      0x0001  /* vflush: skip vnodes marked VSYSTEM */
  396 #define FORCECLOSE      0x0002  /* vflush: force file closure */
  397 #define WRITECLOSE      0x0004  /* vflush: only close writable files */
  398 #define EARLYFLUSH      0x0008  /* vflush: early call for ffs_flushfiles */
  399 #define V_SAVE          0x0001  /* vinvalbuf: sync file first */
  400 #define V_ALT           0x0002  /* vinvalbuf: invalidate only alternate bufs */
  401 #define V_NORMAL        0x0004  /* vinvalbuf: invalidate only regular bufs */
  402 #define V_CLEANONLY     0x0008  /* vinvalbuf: invalidate only clean bufs */
  403 #define V_VMIO          0x0010  /* vinvalbuf: called during pageout */
  404 #define V_ALLOWCLEAN    0x0020  /* vinvalbuf: allow clean buffers after flush */
  405 #define REVOKEALL       0x0001  /* vop_revoke: revoke all aliases */
  406 #define V_WAIT          0x0001  /* vn_start_write: sleep for suspend */
  407 #define V_NOWAIT        0x0002  /* vn_start_write: don't sleep for suspend */
  408 #define V_XSLEEP        0x0004  /* vn_start_write: just return after sleep */
  409 #define V_MNTREF        0x0010  /* vn_start_write: mp is already ref-ed */
  410 
  411 #define VR_START_WRITE  0x0001  /* vfs_write_resume: start write atomically */
  412 #define VR_NO_SUSPCLR   0x0002  /* vfs_write_resume: do not clear suspension */
  413 
  414 #define VS_SKIP_UNMOUNT 0x0001  /* vfs_write_suspend: fail if the
  415                                    filesystem is being unmounted */
  416 
  417 #define VREF(vp)        vref(vp)
  418 
  419 #ifdef DIAGNOSTIC
  420 #define VATTR_NULL(vap) vattr_null(vap)
  421 #else
  422 #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
  423 #endif /* DIAGNOSTIC */
  424 
  425 #define NULLVP  ((struct vnode *)NULL)
  426 
  427 /*
  428  * Global vnode data.
  429  */
  430 extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
  431 extern  struct mount *rootdevmp;        /* "/dev" mount */
  432 extern  int desiredvnodes;              /* number of vnodes desired */
  433 extern  struct uma_zone *namei_zone;
  434 extern  struct vattr va_null;           /* predefined null vattr structure */
  435 
  436 #define VI_LOCK(vp)     mtx_lock(&(vp)->v_interlock)
  437 #define VI_LOCK_FLAGS(vp, flags) mtx_lock_flags(&(vp)->v_interlock, (flags))
  438 #define VI_TRYLOCK(vp)  mtx_trylock(&(vp)->v_interlock)
  439 #define VI_UNLOCK(vp)   mtx_unlock(&(vp)->v_interlock)
  440 #define VI_MTX(vp)      (&(vp)->v_interlock)
  441 
  442 #define VN_LOCK_AREC(vp)        lockallowrecurse((vp)->v_vnlock)
  443 #define VN_LOCK_ASHARE(vp)      lockallowshare((vp)->v_vnlock)
  444 #define VN_LOCK_DSHARE(vp)      lockdisableshare((vp)->v_vnlock)
  445 
  446 #endif /* _KERNEL */
  447 
  448 /*
  449  * Mods for extensibility.
  450  */
  451 
  452 /*
  453  * Flags for vdesc_flags:
  454  */
  455 #define VDESC_MAX_VPS           16
  456 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
  457 #define VDESC_VP0_WILLRELE      0x0001
  458 #define VDESC_VP1_WILLRELE      0x0002
  459 #define VDESC_VP2_WILLRELE      0x0004
  460 #define VDESC_VP3_WILLRELE      0x0008
  461 #define VDESC_NOMAP_VPP         0x0100
  462 #define VDESC_VPP_WILLRELE      0x0200
  463 
  464 /*
  465  * A generic structure.
  466  * This can be used by bypass routines to identify generic arguments.
  467  */
  468 struct vop_generic_args {
  469         struct vnodeop_desc *a_desc;
  470         /* other random data follows, presumably */
  471 };
  472 
  473 typedef int vop_bypass_t(struct vop_generic_args *);
  474 
  475 /*
  476  * VDESC_NO_OFFSET is used to identify the end of the offset list
  477  * and in places where no such field exists.
  478  */
  479 #define VDESC_NO_OFFSET -1
  480 
  481 /*
  482  * This structure describes the vnode operation taking place.
  483  */
  484 struct vnodeop_desc {
  485         char    *vdesc_name;            /* a readable name for debugging */
  486         int      vdesc_flags;           /* VDESC_* flags */
  487         vop_bypass_t    *vdesc_call;    /* Function to call */
  488 
  489         /*
  490          * These ops are used by bypass routines to map and locate arguments.
  491          * Creds and procs are not needed in bypass routines, but sometimes
  492          * they are useful to (for example) transport layers.
  493          * Nameidata is useful because it has a cred in it.
  494          */
  495         int     *vdesc_vp_offsets;      /* list ended by VDESC_NO_OFFSET */
  496         int     vdesc_vpp_offset;       /* return vpp location */
  497         int     vdesc_cred_offset;      /* cred location, if any */
  498         int     vdesc_thread_offset;    /* thread location, if any */
  499         int     vdesc_componentname_offset; /* if any */
  500 };
  501 
  502 #ifdef _KERNEL
  503 /*
  504  * A list of all the operation descs.
  505  */
  506 extern struct vnodeop_desc *vnodeop_descs[];
  507 
  508 #define VOPARG_OFFSETOF(s_type, field)  __offsetof(s_type, field)
  509 #define VOPARG_OFFSETTO(s_type, s_offset, struct_p) \
  510     ((s_type)(((char*)(struct_p)) + (s_offset)))
  511 
  512 
  513 #ifdef DEBUG_VFS_LOCKS
  514 /*
  515  * Support code to aid in debugging VFS locking problems.  Not totally
  516  * reliable since if the thread sleeps between changing the lock
  517  * state and checking it with the assert, some other thread could
  518  * change the state.  They are good enough for debugging a single
  519  * filesystem using a single-threaded test.  Note that the unreliability is
  520  * limited to false negatives; efforts were made to ensure that false
  521  * positives cannot occur.
  522  */
  523 void    assert_vi_locked(struct vnode *vp, const char *str);
  524 void    assert_vi_unlocked(struct vnode *vp, const char *str);
  525 void    assert_vop_elocked(struct vnode *vp, const char *str);
  526 void    assert_vop_locked(struct vnode *vp, const char *str);
  527 void    assert_vop_unlocked(struct vnode *vp, const char *str);
  528 
  529 #define ASSERT_VI_LOCKED(vp, str)       assert_vi_locked((vp), (str))
  530 #define ASSERT_VI_UNLOCKED(vp, str)     assert_vi_unlocked((vp), (str))
  531 #define ASSERT_VOP_ELOCKED(vp, str)     assert_vop_elocked((vp), (str))
  532 #define ASSERT_VOP_LOCKED(vp, str)      assert_vop_locked((vp), (str))
  533 #define ASSERT_VOP_UNLOCKED(vp, str)    assert_vop_unlocked((vp), (str))
  534 
  535 #else /* !DEBUG_VFS_LOCKS */
  536 
  537 #define ASSERT_VI_LOCKED(vp, str)       ((void)0)
  538 #define ASSERT_VI_UNLOCKED(vp, str)     ((void)0)
  539 #define ASSERT_VOP_ELOCKED(vp, str)     ((void)0)
  540 #define ASSERT_VOP_LOCKED(vp, str)      ((void)0)
  541 #define ASSERT_VOP_UNLOCKED(vp, str)    ((void)0)
  542 #endif /* DEBUG_VFS_LOCKS */
  543 
  544 
  545 /*
  546  * This call works for vnodes in the kernel.
  547  */
  548 #define VCALL(c) ((c)->a_desc->vdesc_call(c))
  549 
  550 #define DOINGASYNC(vp)                                          \
  551         (((vp)->v_mount->mnt_kern_flag & MNTK_ASYNC) != 0 &&    \
  552          ((curthread->td_pflags & TDP_SYNCIO) == 0))
  553 
  554 /*
  555  * VMIO support inline
  556  */
  557 
  558 extern int vmiodirenable;
  559 
  560 static __inline int
  561 vn_canvmio(struct vnode *vp)
  562 {
  563       if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
  564                 return(TRUE);
  565         return(FALSE);
  566 }
  567 
  568 /*
  569  * Finally, include the default set of vnode operations.
  570  */
  571 typedef void vop_getpages_iodone_t(void *, vm_page_t *, int, int);
  572 #include "vnode_if.h"
  573 
  574 /* vn_open_flags */
  575 #define VN_OPEN_NOAUDIT         0x00000001
  576 #define VN_OPEN_NOCAPCHECK      0x00000002
  577 #define VN_OPEN_NAMECACHE       0x00000004
  578 
  579 /*
  580  * Public vnode manipulation functions.
  581  */
  582 struct componentname;
  583 struct file;
  584 struct mount;
  585 struct nameidata;
  586 struct ostat;
  587 struct freebsd11_stat;
  588 struct thread;
  589 struct proc;
  590 struct stat;
  591 struct nstat;
  592 struct ucred;
  593 struct uio;
  594 struct vattr;
  595 struct vfsops;
  596 struct vnode;
  597 
  598 typedef int (*vn_get_ino_t)(struct mount *, void *, int, struct vnode **);
  599 
  600 int     bnoreuselist(struct bufv *bufv, struct bufobj *bo, daddr_t startn,
  601             daddr_t endn);
  602 /* cache_* may belong in namei.h. */
  603 void    cache_changesize(int newhashsize);
  604 #define cache_enter(dvp, vp, cnp)                                       \
  605         cache_enter_time(dvp, vp, cnp, NULL, NULL)
  606 void    cache_enter_time(struct vnode *dvp, struct vnode *vp,
  607             struct componentname *cnp, struct timespec *tsp,
  608             struct timespec *dtsp);
  609 int     cache_lookup(struct vnode *dvp, struct vnode **vpp,
  610             struct componentname *cnp, struct timespec *tsp, int *ticksp);
  611 void    cache_purge(struct vnode *vp);
  612 void    cache_purge_negative(struct vnode *vp);
  613 void    cache_purgevfs(struct mount *mp, bool force);
  614 int     change_dir(struct vnode *vp, struct thread *td);
  615 void    cvtstat(struct stat *st, struct ostat *ost);
  616 void    freebsd11_cvtnstat(struct stat *sb, struct nstat *nsb);
  617 int     freebsd11_cvtstat(struct stat *st, struct freebsd11_stat *ost);
  618 int     getnewvnode(const char *tag, struct mount *mp, struct vop_vector *vops,
  619             struct vnode **vpp);
  620 void    getnewvnode_reserve(u_int count);
  621 void    getnewvnode_drop_reserve(void);
  622 int     insmntque1(struct vnode *vp, struct mount *mp,
  623             void (*dtr)(struct vnode *, void *), void *dtr_arg);
  624 int     insmntque(struct vnode *vp, struct mount *mp);
  625 u_quad_t init_va_filerev(void);
  626 int     speedup_syncer(void);
  627 int     vn_vptocnp(struct vnode **vp, struct ucred *cred, char *buf,
  628             u_int *buflen);
  629 int     vn_fullpath(struct thread *td, struct vnode *vn,
  630             char **retbuf, char **freebuf);
  631 int     vn_fullpath_global(struct thread *td, struct vnode *vn,
  632             char **retbuf, char **freebuf);
  633 struct vnode *
  634         vn_dir_dd_ino(struct vnode *vp);
  635 int     vn_commname(struct vnode *vn, char *buf, u_int buflen);
  636 int     vn_path_to_global_path(struct thread *td, struct vnode *vp,
  637             char *path, u_int pathlen);
  638 int     vaccess(enum vtype type, mode_t file_mode, uid_t file_uid,
  639             gid_t file_gid, accmode_t accmode, struct ucred *cred,
  640             int *privused);
  641 int     vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid,
  642             struct acl *aclp, accmode_t accmode, struct ucred *cred,
  643             int *privused);
  644 int     vaccess_acl_posix1e(enum vtype type, uid_t file_uid,
  645             gid_t file_gid, struct acl *acl, accmode_t accmode,
  646             struct ucred *cred, int *privused);
  647 void    vattr_null(struct vattr *vap);
  648 int     vcount(struct vnode *vp);
  649 #define vdrop(vp)       _vdrop((vp), 0)
  650 #define vdropl(vp)      _vdrop((vp), 1)
  651 void    _vdrop(struct vnode *, bool);
  652 int     vflush(struct mount *mp, int rootrefs, int flags, struct thread *td);
  653 int     vget(struct vnode *vp, int lockflag, struct thread *td);
  654 void    vgone(struct vnode *vp);
  655 #define vhold(vp)       _vhold((vp), 0)
  656 #define vholdl(vp)      _vhold((vp), 1)
  657 void    _vhold(struct vnode *, bool);
  658 void    vinactive(struct vnode *, struct thread *);
  659 int     vinvalbuf(struct vnode *vp, int save, int slpflag, int slptimeo);
  660 int     vtruncbuf(struct vnode *vp, struct ucred *cred, off_t length,
  661             int blksize);
  662 void    vunref(struct vnode *);
  663 void    vn_printf(struct vnode *vp, const char *fmt, ...) __printflike(2,3);
  664 int     vrecycle(struct vnode *vp);
  665 int     vrecyclel(struct vnode *vp);
  666 int     vn_bmap_seekhole(struct vnode *vp, u_long cmd, off_t *off,
  667             struct ucred *cred);
  668 int     vn_close(struct vnode *vp,
  669             int flags, struct ucred *file_cred, struct thread *td);
  670 void    vn_finished_write(struct mount *mp);
  671 void    vn_finished_secondary_write(struct mount *mp);
  672 int     vn_fsync_buf(struct vnode *vp, int waitfor);
  673 int     vn_isdisk(struct vnode *vp, int *errp);
  674 int     _vn_lock(struct vnode *vp, int flags, char *file, int line);
  675 #define vn_lock(vp, flags) _vn_lock(vp, flags, __FILE__, __LINE__)
  676 int     vn_open(struct nameidata *ndp, int *flagp, int cmode, struct file *fp);
  677 int     vn_open_cred(struct nameidata *ndp, int *flagp, int cmode,
  678             u_int vn_open_flags, struct ucred *cred, struct file *fp);
  679 int     vn_open_vnode(struct vnode *vp, int fmode, struct ucred *cred,
  680             struct thread *td, struct file *fp);
  681 void    vn_pages_remove(struct vnode *vp, vm_pindex_t start, vm_pindex_t end);
  682 int     vn_pollrecord(struct vnode *vp, struct thread *p, int events);
  683 int     vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base,
  684             int len, off_t offset, enum uio_seg segflg, int ioflg,
  685             struct ucred *active_cred, struct ucred *file_cred, ssize_t *aresid,
  686             struct thread *td);
  687 int     vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, void *base,
  688             size_t len, off_t offset, enum uio_seg segflg, int ioflg,
  689             struct ucred *active_cred, struct ucred *file_cred, size_t *aresid,
  690             struct thread *td);
  691 int     vn_rlimit_fsize(const struct vnode *vn, const struct uio *uio,
  692             struct thread *td);
  693 int     vn_stat(struct vnode *vp, struct stat *sb, struct ucred *active_cred,
  694             struct ucred *file_cred, struct thread *td);
  695 int     vn_start_write(struct vnode *vp, struct mount **mpp, int flags);
  696 int     vn_start_secondary_write(struct vnode *vp, struct mount **mpp,
  697             int flags);
  698 int     vn_writechk(struct vnode *vp);
  699 int     vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace,
  700             const char *attrname, int *buflen, char *buf, struct thread *td);
  701 int     vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace,
  702             const char *attrname, int buflen, char *buf, struct thread *td);
  703 int     vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
  704             const char *attrname, struct thread *td);
  705 int     vn_vget_ino(struct vnode *vp, ino_t ino, int lkflags,
  706             struct vnode **rvp);
  707 int     vn_vget_ino_gen(struct vnode *vp, vn_get_ino_t alloc,
  708             void *alloc_arg, int lkflags, struct vnode **rvp);
  709 int     vn_utimes_perm(struct vnode *vp, struct vattr *vap,
  710             struct ucred *cred, struct thread *td);
  711 
  712 int     vn_io_fault_uiomove(char *data, int xfersize, struct uio *uio);
  713 int     vn_io_fault_pgmove(vm_page_t ma[], vm_offset_t offset, int xfersize,
  714             struct uio *uio);
  715 
  716 #define vn_rangelock_unlock(vp, cookie)                                 \
  717         rangelock_unlock(&(vp)->v_rl, (cookie), VI_MTX(vp))
  718 #define vn_rangelock_unlock_range(vp, cookie, start, end)               \
  719         rangelock_unlock_range(&(vp)->v_rl, (cookie), (start), (end),   \
  720             VI_MTX(vp))
  721 #define vn_rangelock_rlock(vp, start, end)                              \
  722         rangelock_rlock(&(vp)->v_rl, (start), (end), VI_MTX(vp))
  723 #define vn_rangelock_wlock(vp, start, end)                              \
  724         rangelock_wlock(&(vp)->v_rl, (start), (end), VI_MTX(vp))
  725 
  726 int     vfs_cache_lookup(struct vop_lookup_args *ap);
  727 void    vfs_timestamp(struct timespec *);
  728 void    vfs_write_resume(struct mount *mp, int flags);
  729 int     vfs_write_suspend(struct mount *mp, int flags);
  730 int     vfs_write_suspend_umnt(struct mount *mp);
  731 void    vnlru_free(int, struct vfsops *);
  732 int     vop_stdbmap(struct vop_bmap_args *);
  733 int     vop_stdfdatasync_buf(struct vop_fdatasync_args *);
  734 int     vop_stdfsync(struct vop_fsync_args *);
  735 int     vop_stdgetwritemount(struct vop_getwritemount_args *);
  736 int     vop_stdgetpages(struct vop_getpages_args *);
  737 int     vop_stdinactive(struct vop_inactive_args *);
  738 int     vop_stdislocked(struct vop_islocked_args *);
  739 int     vop_stdkqfilter(struct vop_kqfilter_args *);
  740 int     vop_stdlock(struct vop_lock1_args *);
  741 int     vop_stdputpages(struct vop_putpages_args *);
  742 int     vop_stdunlock(struct vop_unlock_args *);
  743 int     vop_nopoll(struct vop_poll_args *);
  744 int     vop_stdaccess(struct vop_access_args *ap);
  745 int     vop_stdaccessx(struct vop_accessx_args *ap);
  746 int     vop_stdadvise(struct vop_advise_args *ap);
  747 int     vop_stdadvlock(struct vop_advlock_args *ap);
  748 int     vop_stdadvlockasync(struct vop_advlockasync_args *ap);
  749 int     vop_stdadvlockpurge(struct vop_advlockpurge_args *ap);
  750 int     vop_stdallocate(struct vop_allocate_args *ap);
  751 int     vop_stdpathconf(struct vop_pathconf_args *);
  752 int     vop_stdpoll(struct vop_poll_args *);
  753 int     vop_stdvptocnp(struct vop_vptocnp_args *ap);
  754 int     vop_stdvptofh(struct vop_vptofh_args *ap);
  755 int     vop_stdunp_bind(struct vop_unp_bind_args *ap);
  756 int     vop_stdunp_connect(struct vop_unp_connect_args *ap);
  757 int     vop_stdunp_detach(struct vop_unp_detach_args *ap);
  758 int     vop_eopnotsupp(struct vop_generic_args *ap);
  759 int     vop_ebadf(struct vop_generic_args *ap);
  760 int     vop_einval(struct vop_generic_args *ap);
  761 int     vop_enoent(struct vop_generic_args *ap);
  762 int     vop_enotty(struct vop_generic_args *ap);
  763 int     vop_null(struct vop_generic_args *ap);
  764 int     vop_panic(struct vop_generic_args *ap);
  765 int     dead_poll(struct vop_poll_args *ap);
  766 int     dead_read(struct vop_read_args *ap);
  767 int     dead_write(struct vop_write_args *ap);
  768 
  769 /* These are called from within the actual VOPS. */
  770 void    vop_close_post(void *a, int rc);
  771 void    vop_create_post(void *a, int rc);
  772 void    vop_deleteextattr_post(void *a, int rc);
  773 void    vop_link_post(void *a, int rc);
  774 void    vop_lookup_post(void *a, int rc);
  775 void    vop_lookup_pre(void *a);
  776 void    vop_mkdir_post(void *a, int rc);
  777 void    vop_mknod_post(void *a, int rc);
  778 void    vop_open_post(void *a, int rc);
  779 void    vop_read_post(void *a, int rc);
  780 void    vop_readdir_post(void *a, int rc);
  781 void    vop_reclaim_post(void *a, int rc);
  782 void    vop_remove_post(void *a, int rc);
  783 void    vop_rename_post(void *a, int rc);
  784 void    vop_rename_pre(void *a);
  785 void    vop_rmdir_post(void *a, int rc);
  786 void    vop_setattr_post(void *a, int rc);
  787 void    vop_setextattr_post(void *a, int rc);
  788 void    vop_symlink_post(void *a, int rc);
  789 
  790 #ifdef DEBUG_VFS_LOCKS
  791 void    vop_strategy_pre(void *a);
  792 void    vop_lock_pre(void *a);
  793 void    vop_lock_post(void *a, int rc);
  794 void    vop_unlock_post(void *a, int rc);
  795 void    vop_unlock_pre(void *a);
  796 #else
  797 #define vop_strategy_pre(x)     do { } while (0)
  798 #define vop_lock_pre(x)         do { } while (0)
  799 #define vop_lock_post(x, y)     do { } while (0)
  800 #define vop_unlock_post(x, y)   do { } while (0)
  801 #define vop_unlock_pre(x)       do { } while (0)
  802 #endif
  803 
  804 void    vop_rename_fail(struct vop_rename_args *ap);
  805 
  806 #define VOP_WRITE_PRE(ap)                                               \
  807         struct vattr va;                                                \
  808         int error;                                                      \
  809         off_t osize, ooffset, noffset;                                  \
  810                                                                         \
  811         osize = ooffset = noffset = 0;                                  \
  812         if (!VN_KNLIST_EMPTY((ap)->a_vp)) {                             \
  813                 error = VOP_GETATTR((ap)->a_vp, &va, (ap)->a_cred);     \
  814                 if (error)                                              \
  815                         return (error);                                 \
  816                 ooffset = (ap)->a_uio->uio_offset;                      \
  817                 osize = (off_t)va.va_size;                              \
  818         }
  819 
  820 #define VOP_WRITE_POST(ap, ret)                                         \
  821         noffset = (ap)->a_uio->uio_offset;                              \
  822         if (noffset > ooffset && !VN_KNLIST_EMPTY((ap)->a_vp)) {        \
  823                 VFS_KNOTE_LOCKED((ap)->a_vp, NOTE_WRITE                 \
  824                     | (noffset > osize ? NOTE_EXTEND : 0));             \
  825         }
  826 
  827 #define VOP_LOCK(vp, flags) VOP_LOCK1(vp, flags, __FILE__, __LINE__)
  828 
  829 
  830 void    vput(struct vnode *vp);
  831 void    vrele(struct vnode *vp);
  832 void    vref(struct vnode *vp);
  833 void    vrefl(struct vnode *vp);
  834 void    vrefact(struct vnode *vp);
  835 int     vrefcnt(struct vnode *vp);
  836 void    v_addpollinfo(struct vnode *vp);
  837 
  838 int vnode_create_vobject(struct vnode *vp, off_t size, struct thread *td);
  839 void vnode_destroy_vobject(struct vnode *vp);
  840 
  841 extern struct vop_vector fifo_specops;
  842 extern struct vop_vector dead_vnodeops;
  843 extern struct vop_vector default_vnodeops;
  844 
  845 #define VOP_PANIC       ((void*)(uintptr_t)vop_panic)
  846 #define VOP_NULL        ((void*)(uintptr_t)vop_null)
  847 #define VOP_EBADF       ((void*)(uintptr_t)vop_ebadf)
  848 #define VOP_ENOTTY      ((void*)(uintptr_t)vop_enotty)
  849 #define VOP_EINVAL      ((void*)(uintptr_t)vop_einval)
  850 #define VOP_ENOENT      ((void*)(uintptr_t)vop_enoent)
  851 #define VOP_EOPNOTSUPP  ((void*)(uintptr_t)vop_eopnotsupp)
  852 
  853 /* fifo_vnops.c */
  854 int     fifo_printinfo(struct vnode *);
  855 
  856 /* vfs_hash.c */
  857 typedef int vfs_hash_cmp_t(struct vnode *vp, void *arg);
  858 
  859 void vfs_hash_changesize(int newhashsize);
  860 int vfs_hash_get(const struct mount *mp, u_int hash, int flags,
  861     struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
  862 u_int vfs_hash_index(struct vnode *vp);
  863 int vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td,
  864     struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
  865 void vfs_hash_ref(const struct mount *mp, u_int hash, struct thread *td,
  866     struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
  867 void vfs_hash_rehash(struct vnode *vp, u_int hash);
  868 void vfs_hash_remove(struct vnode *vp);
  869 
  870 int vfs_kqfilter(struct vop_kqfilter_args *);
  871 void vfs_mark_atime(struct vnode *vp, struct ucred *cred);
  872 struct dirent;
  873 int vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off);
  874 
  875 int vfs_unixify_accmode(accmode_t *accmode);
  876 
  877 void vfs_unp_reclaim(struct vnode *vp);
  878 
  879 int setfmode(struct thread *td, struct ucred *cred, struct vnode *vp, int mode);
  880 int setfown(struct thread *td, struct ucred *cred, struct vnode *vp, uid_t uid,
  881     gid_t gid);
  882 int vn_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
  883     struct thread *td);
  884 int vn_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
  885     struct thread *td);
  886 
  887 void vn_fsid(struct vnode *vp, struct vattr *va);
  888 
  889 #endif /* _KERNEL */
  890 
  891 #endif /* !_SYS_VNODE_H_ */

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