sys/sys/vnode.h

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)vnode.h     8.7 (Berkeley) 2/4/94
  30  * $FreeBSD: src/sys/sys/vnode.h,v 1.111.2.19 2002/12/29 18:19:53 dillon Exp $
  31  */
  32
  33 #ifndef _SYS_VNODE_H_
  34 #define _SYS_VNODE_H_
  35
  36 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  37
  38 #ifndef _SYS_QUEUE_H_
  39 #include <sys/queue.h>
  40 #endif
  41 #ifndef _SYS_LOCK_H_
  42 #include <sys/lock.h>
  43 #endif
  44 #ifndef _SYS_EVENT_H_
  45 #include <sys/event.h>
  46 #endif
  47 #ifndef _SYS_BIOTRACK_H_
  48 #include <sys/biotrack.h>
  49 #endif
  50 #ifndef _SYS_UIO_H_
  51 #include <sys/uio.h>
  52 #endif
  53 #ifndef _SYS_ACL_H_
  54 #include <sys/acl.h>
  55 #endif
  56 #ifndef _SYS_NAMECACHE_H_
  57 #include <sys/namecache.h>
  58 #endif
  59 #ifndef _SYS_THREAD_H_
  60 #include <sys/thread.h>
  61 #endif
  62 #ifndef _SYS_VFSOPS_H_
  63 #include <sys/vfsops.h>
  64 #endif
  65 #ifndef _SYS_VFSCACHE_H_
  66 #include <sys/vfscache.h>
  67 #endif
  68 #ifndef _SYS_TREE_H_
  69 #include <sys/tree.h>
  70 #endif
  71 #ifndef _SYS_SYSLINK_RPC_H_
  72 #include <sys/syslink_rpc.h>
  73 #endif
  74 #ifndef _SYS_SYSREF_H_
  75 #include <sys/sysref.h>
  76 #endif
  77 #ifndef _MACHINE_LOCK_H_
  78 #include <machine/lock.h>
  79 #endif
  80
  81 /*
  82  * The vnode is the focus of all file activity in UNIX.  There is a
  83  * unique vnode allocated for each active file, each current directory,
  84  * each mounted-on file, text file, and the root.
  85  */
  86
  87 /*
  88  * Each underlying filesystem allocates its own private area and hangs
  89  * it from v_data.  If non-null, this area is freed in getnewvnode().
  90  */
  91 TAILQ_HEAD(buflists, buf);
  92
  93 /*
  94  * Struct for mount options to printable formats.
  95  */
  96 struct mountctl_opt {
  97         int             o_opt;
  98         const char      *o_name;
  99 };
 100
 101 /*
 102  * The vnode infrastructure is being reorgranized.  Most reference-related
 103  * fields are locked by the BGL, and most file I/O related operations and
 104  * vnode teardown functions are locked by the vnode lock.
 105  *
 106  * File read operations require a shared lock, file write operations require
 107  * an exclusive lock.  Most directory operations (read or write) currently
 108  * require an exclusive lock due to the side effects stored in the directory
 109  * inode (which we intend to fix).
 110  *
 111  * File reads and writes are further protected by a range lock.  The intention
 112  * is to be able to break I/O operations down into more easily managed pieces
 113  * so vm_page arrays can be passed through rather then UIOs.  This work will
 114  * occur in multiple stages.  The range locks will also eventually be used to
 115  * deal with clustered cache coherency issues and, more immediately, to
 116  * protect operations associated with the kernel-managed journaling module.
 117  *
 118  * NOTE: Certain fields within the vnode structure requires v_token to be
 119  *       held.  The vnode's normal lock need not be held when accessing
 120  *       these fields as long as the vnode is deterministically referenced
 121  *       (i.e. can't be ripped out from under the caller).  This is typical
 122  *       for code paths based on descriptors or file pointers, but not for
 123  *       backdoor code paths that come in via the buffer cache.
 124  *
 125  *      v_rbclean_tree
 126  *      v_rbdirty_tree
 127  *      v_rbhash_tree
 128  *      v_pollinfo
 129  *
 130  * NOTE: The vnode operations vector, v_ops, is a double-indirect that
 131  *       typically points to &v_mount->mnt_vn_use_ops.  We use a double
 132  *       pointer because mnt_vn_use_ops may change dynamically when e.g.
 133  *       journaling is turned on or off.
 134  *
 135  * NOTE: v_filesize is currently only applicable when a VM object is
 136  *       associated with the vnode.  Otherwise it will be set to NOOFFSET.
 137  *
 138  * NOTE: The following fields require a spin or token lock.  Note that
 139  *       additional subsystems may use v_token or v_spin for other
 140  *       purposes, e.g. vfs/fifofs/fifo_vnops.c
 141  *
 142  *       v_namecache    v_spin
 143  *       v_rb*          v_token
 144  */
 145 RB_HEAD(buf_rb_tree, buf);
 146 RB_HEAD(buf_rb_hash, buf);
 147
 148 struct vnode {
 149         struct spinlock v_spin;
 150         int     v_flag;                         /* vnode flags (see below) */
 151         int     v_writecount;
 152         int     v_opencount;                    /* number of explicit opens */
 153         int     v_auxrefs;                      /* auxiliary references */
 154         int     v_refcnt;
 155         int     v_pbuf_count;                   /* (device nodes only) */
 156         struct bio_track v_track_read;          /* track I/O's in progress */
 157         struct bio_track v_track_write;         /* track I/O's in progress */
 158         struct mount *v_mount;                  /* ptr to vfs we are in */
 159         struct vop_ops **v_ops;                 /* vnode operations vector */
 160         TAILQ_ENTRY(vnode) v_list;              /* vnode act/inact/cache/free */
 161         TAILQ_ENTRY(vnode) v_nmntvnodes;        /* vnodes for mount point */
 162         LIST_ENTRY(vnode) v_synclist;           /* vnodes with dirty buffers */
 163         struct buf_rb_tree v_rbclean_tree;      /* RB tree of clean bufs */
 164         struct buf_rb_tree v_rbdirty_tree;      /* RB tree of dirty bufs */
 165         struct buf_rb_hash v_rbhash_tree;       /* RB tree general lookup */
 166         enum    vtype v_type;                   /* vnode type */
 167         int16_t         v_act;                  /* use heuristic */
 168         int16_t         v_state;                /* active/free/cached */
 169         union {
 170                 struct socket   *vu_socket;     /* unix ipc (VSOCK) */
 171                 struct {
 172                         int     vu_umajor;      /* device number for attach */
 173                         int     vu_uminor;
 174                         struct cdev     *vu_cdevinfo; /* device (VCHR, VBLK) */
 175                         SLIST_ENTRY(vnode) vu_cdevnext;
 176                 } vu_cdev;
 177                 struct fifoinfo *vu_fifoinfo;   /* fifo (VFIFO) */
 178         } v_un;
 179         off_t   v_filesize;                     /* file EOF or NOOFFSET */
 180         off_t   v_lazyw;                        /* lazy write iterator */
 181         struct vm_object *v_object;             /* Place to store VM object */
 182         struct  lock v_lock;                    /* file/dir ops lock */
 183         struct  lwkt_token v_token;             /* (see above) */
 184         enum    vtagtype v_tag;                 /* type of underlying data */
 185         void    *v_data;                        /* private data for fs */
 186         struct namecache_list v_namecache;      /* (S) associated nc entries */
 187         struct  {
 188                 struct  kqinfo vpi_kqinfo;      /* identity of poller(s) */
 189         } v_pollinfo;
 190         struct vmresident *v_resident;          /* optional vmresident */
 191         struct mount *v_pfsmp;                  /* real mp for pfs/nullfs mt */
 192 #ifdef  DEBUG_LOCKS
 193         const char *filename;                   /* Source file doing locking */
 194         int line;                               /* Line number doing locking */
 195 #endif
 196 };
 197 #define v_socket        v_un.vu_socket
 198 #define v_umajor        v_un.vu_cdev.vu_umajor
 199 #define v_uminor        v_un.vu_cdev.vu_uminor
 200 #define v_rdev          v_un.vu_cdev.vu_cdevinfo
 201 #define v_cdevnext      v_un.vu_cdev.vu_cdevnext
 202 #define v_fifoinfo      v_un.vu_fifoinfo
 203
 204 /*
 205  * Vnode flags.
 206  */
 207 #define VROOT           0x00000001      /* root of its file system */
 208 #define VTEXT           0x00000002      /* vnode is a pure text prototype */
 209 #define VSYSTEM         0x00000004      /* vnode being used by kernel */
 210 #define VISTTY          0x00000008      /* vnode represents a tty */
 211 #define VCTTYISOPEN     0x00000010      /* controlling terminal tty is open */
 212 #define VCKPT           0x00000020      /* checkpoint-restored vnode */
 213 /* open for business    0x00000040 */
 214 #define VMAYHAVELOCKS   0x00000080      /* maybe posix or flock locks on vp */
 215 #define VPFSROOT        0x00000100      /* may be a pseudo filesystem root */
 216 /* open for business    0x00000200 */
 217 #define VAGE0           0x00000400      /* Age count for recycling - 2 bits */
 218 #define VAGE1           0x00000800      /* Age count for recycling - 2 bits */
 219 /* open for business    0x00001000 */
 220 #define VOBJBUF         0x00002000      /* Allocate buffers in VM object */
 221 #define VINACTIVE       0x00004000      /* ran VOP_INACTIVE */
 222 /* open for business    0x00008000 */
 223 /* open for business    0x00010000 */
 224 /* open for business    0x00020000 */
 225 #define VRECLAIMED      0x00040000      /* This vnode has been destroyed */
 226 /* open for business    0x00080000 */
 227 #define VNOTSEEKABLE    0x00100000      /* rd/wr ignores file offset */
 228 #define VONWORKLST      0x00200000      /* On syncer work-list */
 229 #define VISDIRTY        0x00400000      /* inode dirty from VFS */
 230 #define VOBJDIRTY       0x00800000      /* object might be dirty */
 231 #define VSWAPCACHE      0x01000000      /* enable swapcache */
 232 /* open for business    0x02000000 */
 233 /* open for business    0x04000000 */
 234
 235 /*
 236  * v_state flags (v_state is interlocked by v_spin and vfs_spin)
 237  */
 238 #define VS_CACHED       0
 239 #define VS_ACTIVE       1
 240 #define VS_INACTIVE     2
 241 #define VS_DYING        3
 242
 243 /*
 244  * v_refcnt uses bit 30 to flag that 1->0 transitions require finalization
 245  * (actual deactivation) and bit 31 to indicate that deactivation is in
 246  * progress.
 247  *
 248  * The VREFCNT() macro returns a negative number if the vnode is undergoing
 249  * termination (value should not be interpreted beyond being negative),
 250  * zero if it is cached and has no references, or a positive number
 251  * indicating the number of refs.
 252  */
 253 #define VREF_TERMINATE  0x80000000      /* termination in progress */
 254 #define VREF_FINALIZE   0x40000000      /* deactivate on last vrele */
 255 #define VREF_MASK       0xBFFFFFFF      /* includes VREF_TERMINATE */
 256
 257 #define VREFCNT(vp)     ((int)((vp)->v_refcnt & VREF_MASK))
 258
 259 /*
 260  * vmntvnodescan() flags
 261  */
 262 #define VMSC_GETVP      0x01
 263 #define VMSC_GETVX      0x02
 264 #define VMSC_NOWAIT     0x10
 265 #define VMSC_ONEPASS    0x20
 266
 267 /*
 268  * Flags for ioflag. (high 16 bits used to ask for read-ahead and
 269  * help with write clustering)
 270  */
 271 #define IO_UNIT         0x0001          /* do I/O as atomic unit */
 272 #define IO_APPEND       0x0002          /* append write to end */
 273 #define IO_SYNC         0x0004          /* do I/O synchronously */
 274 #define IO_NODELOCKED   0x0008          /* underlying node already locked */
 275 #define IO_NDELAY       0x0010          /* FNDELAY flag set in file table */
 276 #define IO_VMIO         0x0020          /* data already in VMIO space */
 277 #define IO_INVAL        0x0040          /* invalidate after I/O */
 278 #define IO_ASYNC        0x0080          /* bawrite rather then bdwrite */
 279 #define IO_DIRECT       0x0100          /* attempt to bypass buffer cache */
 280 #define IO_RECURSE      0x0200          /* possibly device-recursive (vn) */
 281 #define IO_CORE         0x0400          /* I/O is part of core dump */
 282 #define IO_NRDELAY      0x0800          /* do not block on disk reads */
 283
 284 #define IO_SEQMAX       0x7F            /* seq heuristic max value */
 285 #define IO_SEQSHIFT     16              /* seq heuristic in upper 16 bits */
 286
 287 /*
 288  * Modes.  Note that these V-modes must match file S_I*USR, SUID, SGID,
 289  * and SVTX flag bits.
 290  */
 291 #define VSUID   04000           /* set user id on execution */
 292 #define VSGID   02000           /* set group id on execution */
 293 #define VSVTX   01000           /* save swapped text even after use */
 294 #define VREAD   00400           /* read, write, execute permissions */
 295 #define VWRITE  00200
 296 #define VEXEC   00100
 297
 298 /*
 299  * Token indicating no attribute value yet assigned.
 300  */
 301 #define VNOVAL  (-1)
 302
 303 /*
 304  * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
 305  */
 306 #define VLKTIMEOUT     (hz / 20 + 1)
 307
 308 #ifdef _KERNEL
 309
 310 /*
 311  * Convert between vnode types and inode formats (since POSIX.1
 312  * defines mode word of stat structure in terms of inode formats).
 313  */
 314 extern  enum vtype      iftovt_tab[];
 315 extern  int             vttoif_tab[];
 316 #define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
 317 #define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
 318 #define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))
 319
 320 /*
 321  * Flags to various vnode functions.
 322  */
 323 #define SKIPSYSTEM      0x0001          /* vflush: skip vnodes marked VSYSTEM */
 324 #define FORCECLOSE      0x0002          /* vflush: force file closure */
 325 #define WRITECLOSE      0x0004          /* vflush: only close writable files */
 326 #define DOCLOSE         0x0008          /* vclean: close active files */
 327 #define V_SAVE          0x0001          /* vinvalbuf: sync file first */
 328
 329 #ifdef DIAGNOSTIC
 330 #define VATTR_NULL(vap) vattr_null(vap)
 331 #else
 332 #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
 333 #endif /* DIAGNOSTIC */
 334
 335 #define NULLVP  ((struct vnode *)NULL)
 336
 337 #define VNODEOP_SET(f) \
 338         SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_nadd_vnodeops_sysinit, &f); \
 339         SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND,vfs_nrm_vnodeops_sysinit, &f);
 340
 341 /*
 342  * Global vnode data.
 343  */
 344 struct objcache;
 345
 346 extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
 347 extern  struct nchandle rootnch;        /* root (i.e. "/") namecache */
 348 extern  int maxvnodes;                  /* nominal maximum number of vnodes */
 349 extern  time_t syncdelay;               /* max time to delay syncing data */
 350 extern  time_t filedelay;               /* time to delay syncing files */
 351 extern  time_t dirdelay;                /* time to delay syncing directories */
 352 extern  time_t metadelay;               /* time to delay syncing metadata */
 353 extern  struct objcache *namei_oc;
 354 extern  int prtactive;                  /* nonzero to call vprint() */
 355 extern  struct vattr va_null;           /* predefined null vattr structure */
 356 extern  int numvnodes;
 357 extern  int inactivevnodes;
 358 extern  int activevnodes;
 359
 360 /*
 361  * This macro is very helpful in defining those offsets in the vdesc struct.
 362  *
 363  * This is stolen from X11R4.  I ignored all the fancy stuff for
 364  * Crays, so if you decide to port this to such a serious machine,
 365  * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
 366  */
 367 #define VOPARG_OFFSET(p_type,field) \
 368         ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
 369 #define VOPARG_OFFSETOF(s_type,field) \
 370         VOPARG_OFFSET(s_type*,field)
 371 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
 372         ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
 373
 374 typedef int (*vnodeopv_entry_t)(struct vop_generic_args *);
 375
 376 /*
 377  * VOCALL calls an op given an ops vector.  We break it out because BSD's
 378  * vclean changes the ops vector and then wants to call ops with the old
 379  * vector.
 380  */
 381
 382 typedef int (*vocall_func_t)(struct vop_generic_args *);
 383
 384 /*
 385  * This call executes the vops vector for the offset stored in the ap's
 386  * descriptor of the passed vops rather then the one related to the
 387  * ap's vop_ops structure.  It is used to chain VOPS calls on behalf of
 388  * filesystems from a VFS's context ONLY (that is, from a VFS's own vops
 389  * vector function).
 390  */
 391 #define VOCALL(vops, ap)                \
 392         (*(vocall_func_t *)((char *)(vops)+((ap)->a_desc->sd_offset)))(ap)
 393
 394 #define VDESC(OP) (& __CONCAT(OP,_desc))
 395
 396 /*
 397  * Public vnode manipulation functions.
 398  */
 399 struct file;
 400 struct mount;
 401 struct nlookupdata;
 402 struct proc;
 403 struct thread;
 404 struct stat;
 405 struct ucred;
 406 struct uio;
 407 struct vattr;
 408 struct vnode;
 409 struct syncer_ctx;
 410
 411 struct vnode *getsynthvnode(const char *devname);
 412 void    addaliasu (struct vnode *vp, int x, int y);
 413 int     v_associate_rdev(struct vnode *vp, cdev_t dev);
 414 void    v_release_rdev(struct vnode *vp);
 415 int     bdevvp (cdev_t dev, struct vnode **vpp);
 416 struct vnode *allocvnode(int lktimeout, int lkflags);
 417 void    allocvnode_gc(void);
 418 int     freesomevnodes(int count);
 419 int     getnewvnode (enum vtagtype tag, struct mount *mp,
 420                     struct vnode **vpp, int timo, int lkflags);
 421 int     getspecialvnode (enum vtagtype tag, struct mount *mp,
 422                     struct vop_ops **ops, struct vnode **vpp, int timo,
 423                     int lkflags);
 424 void    speedup_syncer (struct mount *mp);
 425 int     vaccess(enum vtype, mode_t, uid_t, gid_t, mode_t, struct ucred *);
 426 void    vattr_null (struct vattr *vap);
 427 int     vcount (struct vnode *vp);
 428 int     vfinddev (cdev_t dev, enum vtype type, struct vnode **vpp);
 429 void    vfs_nadd_vnodeops_sysinit (void *);
 430 void    vfs_nrm_vnodeops_sysinit (void *);
 431 void    vfs_add_vnodeops(struct mount *, struct vop_ops *, struct vop_ops **);
 432 void    vfs_rm_vnodeops(struct mount *, struct vop_ops *, struct vop_ops **);
 433 int     vflush (struct mount *mp, int rootrefs, int flags);
 434
 435 int     vmntvnodescan(struct mount *mp, int flags,
 436             int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data),
 437             int (*slowfunc)(struct mount *mp, struct vnode *vp, void *data),
 438             void *data);
 439 int     vsyncscan(struct mount *mp, int flags,
 440             int (*slowfunc)(struct mount *mp, struct vnode *vp, void *data),
 441             void *data);
 442 void    vclrisdirty(struct vnode *vp);
 443 void    vclrobjdirty(struct vnode *vp);
 444 void    vsetisdirty(struct vnode *vp);
 445 void    vsetobjdirty(struct vnode *vp);
 446
 447 void    insmntque(struct vnode *vp, struct mount *mp);
 448
 449 void    vclean_vxlocked (struct vnode *vp, int flags);
 450 void    vclean_unlocked (struct vnode *vp);
 451 void    vgone_vxlocked (struct vnode *vp);
 452 int     vrevoke (struct vnode *vp, struct ucred *cred);
 453 int     vinvalbuf (struct vnode *vp, int save, int slpflag, int slptimeo);
 454 int     vtruncbuf (struct vnode *vp, off_t length, int blksize);
 455 void    vnode_pager_setsize (struct vnode *, vm_ooffset_t);
 456 int     nvtruncbuf (struct vnode *vp, off_t length, int blksize, int boff,
 457                 int trivial);
 458 int     nvextendbuf(struct vnode *vp, off_t olength, off_t nlength,
 459                 int oblksize, int nblksize,
 460                 int oboff, int nboff, int trivial);
 461 void    nvnode_pager_setsize (struct vnode *vp, off_t length,
 462                 int blksize, int boff);
 463 int     vfsync(struct vnode *vp, int waitfor, int passes,
 464                 int (*checkdef)(struct buf *),
 465                 int (*waitoutput)(struct vnode *, struct thread *));
 466 int     vinitvmio(struct vnode *vp, off_t filesize, int blksize, int boff);
 467 void    vprint (char *label, struct vnode *vp);
 468 int     vrecycle (struct vnode *vp);
 469 int     vmaxiosize (struct vnode *vp);
 470 void    vn_strategy(struct vnode *vp, struct bio *bio);
 471 int     vn_cache_strategy(struct vnode *vp, struct bio *bio);
 472 int     vn_close (struct vnode *vp, int flags, struct file *fp);
 473 void    vn_gone (struct vnode *vp);
 474 int     vn_isdisk (struct vnode *vp, int *errp);
 475 int     vn_islocked (struct vnode *vp);
 476 int     vn_islocked_unlock (struct vnode *vp);
 477 void    vn_islocked_relock (struct vnode *vp, int vpls);
 478 int     vn_lock (struct vnode *vp, int flags);
 479 void    vn_unlock (struct vnode *vp);
 480
 481 #ifdef  DEBUG_LOCKS
 482 int     debug_vn_lock (struct vnode *vp, int flags,
 483                 const char *filename, int line);
 484 #define vn_lock(vp,flags)       debug_vn_lock(vp, flags, __FILE__, __LINE__)
 485 #endif
 486
 487 /*#define DEBUG_VN_UNLOCK*/
 488 #ifdef DEBUG_VN_UNLOCK
 489 void    debug_vn_unlock (struct vnode *vp,
 490                 const char *filename, int line);
 491 #define vn_unlock(vp)           debug_vn_unlock(vp, __FILE__, __LINE__)
 492 #endif
 493
 494 int     vn_get_namelen(struct vnode *, int *);
 495 void    vn_setspecops (struct file *fp);
 496 int     vn_fullpath (struct proc *p, struct vnode *vn, char **retbuf, char **freebuf, int guess);
 497 int     vn_open (struct nlookupdata *ndp, struct file *fp, int fmode, int cmode);
 498 int     vn_opendisk (const char *devname, int fmode, struct vnode **vpp);
 499 int     vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
 500             int len, off_t offset, enum uio_seg segflg, int ioflg,
 501             struct ucred *cred, int *aresid);
 502 int     vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
 503             int len, off_t offset, enum uio_seg segflg, int ioflg,
 504             struct ucred *cred, int *aresid);
 505 int     vn_stat (struct vnode *vp, struct stat *sb, struct ucred *cred);
 506 cdev_t  vn_todev (struct vnode *vp);
 507 void    vfs_timestamp (struct timespec *);
 508 size_t  vfs_flagstostr(int flags, const struct mountctl_opt *optp, char *buf, size_t len, int *errorp);
 509 void    vn_mark_atime(struct vnode *vp, struct thread *td);
 510 int     vfs_inodehashsize(void);
 511 int     vn_writechk (struct vnode *vp, struct nchandle *nch);
 512 int     ncp_writechk(struct nchandle *nch);
 513 int     vop_stdopen (struct vop_open_args *ap);
 514 int     vop_stdclose (struct vop_close_args *ap);
 515 int     vop_stdmountctl(struct vop_mountctl_args *ap);
 516 int     vop_stdgetpages(struct vop_getpages_args *ap);
 517 int     vop_stdputpages(struct vop_putpages_args *ap);
 518 int     vop_stdmarkatime(struct vop_markatime_args *ap);
 519 int     vop_stdnoread(struct vop_read_args *ap);
 520 int     vop_stdnowrite(struct vop_write_args *ap);
 521 int     vop_stdpathconf (struct vop_pathconf_args *ap);
 522 int     vop_eopnotsupp (struct vop_generic_args *ap);
 523 int     vop_ebadf (struct vop_generic_args *ap);
 524 int     vop_einval (struct vop_generic_args *ap);
 525 int     vop_enotty (struct vop_generic_args *ap);
 526 int     vop_defaultop (struct vop_generic_args *ap);
 527 int     vop_null (struct vop_generic_args *ap);
 528 int     vop_write_dirent(int *, struct uio *, ino_t, uint8_t, uint16_t,
 529                          const char *);
 530
 531 int     vop_compat_nresolve(struct vop_nresolve_args *ap);
 532 int     vop_compat_nlookupdotdot(struct vop_nlookupdotdot_args *ap);
 533 int     vop_compat_ncreate(struct vop_ncreate_args *ap);
 534 int     vop_compat_nmkdir(struct vop_nmkdir_args *ap);
 535 int     vop_compat_nmknod(struct vop_nmknod_args *ap);
 536 int     vop_compat_nlink(struct vop_nlink_args *ap);
 537 int     vop_compat_nsymlink(struct vop_nsymlink_args *ap);
 538 int     vop_compat_nwhiteout(struct vop_nwhiteout_args *ap);
 539 int     vop_compat_nremove(struct vop_nremove_args *ap);
 540 int     vop_compat_nrmdir(struct vop_nrmdir_args *ap);
 541 int     vop_compat_nrename(struct vop_nrename_args *ap);
 542
 543 void    vx_lock (struct vnode *vp);
 544 void    vx_unlock (struct vnode *vp);
 545 void    vx_get (struct vnode *vp);
 546 int     vx_get_nonblock (struct vnode *vp);
 547 void    vx_put (struct vnode *vp);
 548 int     vget (struct vnode *vp, int lockflag);
 549 void    vput (struct vnode *vp);
 550 void    vhold (struct vnode *);
 551 void    vdrop (struct vnode *);
 552 void    vref (struct vnode *vp);
 553 void    vrele (struct vnode *vp);
 554 void    vsetflags (struct vnode *vp, int flags);
 555 void    vclrflags (struct vnode *vp, int flags);
 556
 557 /*#define DEBUG_VPUT*/
 558 #ifdef DEBUG_VPUT
 559 void    debug_vput (struct vnode *vp, const char *filename, int line);
 560 #define vput(vp)                debug_vput(vp, __FILE__, __LINE__)
 561 #endif
 562
 563 void    vfs_subr_init(void);
 564 void    vfs_mount_init(void);
 565 void    vfs_lock_init(void);
 566 void    mount_init(struct mount *mp);
 567 int     countcachedvnodes(int gupdate);
 568
 569 void    vn_syncer_add(struct vnode *, int);
 570 void    vn_syncer_remove(struct vnode *, int);
 571 void    vn_syncer_thr_create(struct mount *);
 572 void    vn_syncer_thr_stop(struct mount *);
 573
 574 extern  struct vop_ops default_vnode_vops;
 575 extern  struct vop_ops dead_vnode_vops;
 576
 577 extern  struct vop_ops *default_vnode_vops_p;
 578 extern  struct vop_ops *dead_vnode_vops_p;
 579
 580 #endif  /* _KERNEL */
 581
 582 #endif  /* _KERNEL || _KERNEL_STRUCTURES */
 583 #endif  /* !_SYS_VNODE_H_ */