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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)vnode.h     8.7 (Berkeley) 2/4/94
  34  * $FreeBSD: src/sys/sys/vnode.h,v 1.111.2.19 2002/12/29 18:19:53 dillon Exp $
  35  * $DragonFly: src/sys/sys/vnode.h,v 1.83 2008/09/17 21:44:19 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_VNODE_H_
  39 #define _SYS_VNODE_H_
  40
  41 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  42
  43 #ifndef _SYS_QUEUE_H_
  44 #include <sys/queue.h>
  45 #endif
  46 #ifndef _SYS_LOCK_H_
  47 #include <sys/lock.h>
  48 #endif
  49 #ifndef _SYS_SELINFO_H_
  50 #include <sys/selinfo.h>
  51 #endif
  52 #ifndef _SYS_BIOTRACK_H_
  53 #include <sys/biotrack.h>
  54 #endif
  55 #ifndef _SYS_UIO_H_
  56 #include <sys/uio.h>
  57 #endif
  58 #ifndef _SYS_ACL_H_
  59 #include <sys/acl.h>
  60 #endif
  61 #ifndef _SYS_NAMECACHE_H_
  62 #include <sys/namecache.h>
  63 #endif
  64 #ifndef _SYS_THREAD_H_
  65 #include <sys/thread.h>
  66 #endif
  67 #ifndef _SYS_VFSOPS_H_
  68 #include <sys/vfsops.h>
  69 #endif
  70 #ifndef _SYS_VFSCACHE_H_
  71 #include <sys/vfscache.h>
  72 #endif
  73 #ifndef _SYS_TREE_H_
  74 #include <sys/tree.h>
  75 #endif
  76 #ifndef _SYS_SYSLINK_RPC_H_
  77 #include <sys/syslink_rpc.h>
  78 #endif
  79 #ifndef _SYS_SYSREF_H_
  80 #include <sys/sysref.h>
  81 #endif
  82 #ifndef _SYS_CCMS_H_
  83 #include <sys/ccms.h>
  84 #endif
  85 #ifndef _MACHINE_LOCK_H_
  86 #include <machine/lock.h>
  87 #endif
  88
  89 /*
  90  * The vnode is the focus of all file activity in UNIX.  There is a
  91  * unique vnode allocated for each active file, each current directory,
  92  * each mounted-on file, text file, and the root.
  93  */
  94
  95 /*
  96  * Each underlying filesystem allocates its own private area and hangs
  97  * it from v_data.  If non-null, this area is freed in getnewvnode().
  98  */
  99 TAILQ_HEAD(buflists, buf);
 100
 101 /*
 102  * Struct for mount options to printable formats.
 103  */
 104 struct mountctl_opt {
 105         int             o_opt;
 106         const char      *o_name;
 107 };
 108
 109 /*
 110  * Range locks protect offset ranges in files and directories at a high
 111  * level, allowing the actual I/O to be broken down into smaller pieces.
 112  * Range locks will eventually be integrated into the clustered cache
 113  * coherency infrastructure.
 114  *
 115  * We use a simple data structure for now, but eventually this should
 116  * probably be a btree or red-black tree.
 117  */
 118 struct vrangelock;
 119
 120 TAILQ_HEAD(vrangelock_list, vrangelock);
 121
 122 struct vrangehead {
 123         struct vrangelock_list  vh_list;
 124 };
 125
 126 struct vrangelock {
 127         TAILQ_ENTRY(vrangelock) vr_node;
 128         int             vr_flags;
 129         off_t           vr_offset;
 130         off_t           vr_length;
 131 };
 132
 133 #define RNGL_WAITING    0x0001          /* waiting for lock, else has lock */
 134 #define RNGL_CHECK      0x0002          /* check for work on unlock */
 135 #define RNGL_SHARED     0x0004          /* shared lock, else exclusive */
 136 #define RNGL_ONLIST     0x0008          /* sanity check */
 137
 138 static __inline
 139 void
 140 vrange_init(struct vrangelock *vr, int flags, off_t offset, off_t length)
 141 {
 142         vr->vr_flags = flags;
 143         vr->vr_offset = offset;
 144         vr->vr_length = length;
 145 }
 146
 147 #ifdef _KERNEL
 148
 149 void    vrange_lock(struct vnode *vp, struct vrangelock *vr);
 150 void    vrange_unlock(struct vnode *vp, struct vrangelock *vr);
 151
 152 static __inline
 153 void
 154 vrange_lock_shared(struct vnode *vp, struct vrangelock *vr,
 155                     off_t offset, off_t length)
 156 {
 157         vrange_init(vr, RNGL_SHARED, offset, length);
 158         vrange_lock(vp, vr);
 159 }
 160
 161 static __inline
 162 void
 163 vrange_lock_excl(struct vnode *vp, struct vrangelock *vr,
 164                     off_t offset, off_t length)
 165 {
 166         vrange_init(vr, 0, offset, length);
 167         vrange_lock(vp, vr);
 168 }
 169
 170 #endif
 171
 172 /*
 173  * The vnode infrastructure is being reorgranized.  Most reference-related
 174  * fields are locked by the BGL, and most file I/O related operations and
 175  * vnode teardown functions are locked by the vnode lock.
 176  *
 177  * File read operations require a shared lock, file write operations require
 178  * an exclusive lock.  Most directory operations (read or write) currently
 179  * require an exclusive lock due to the side effects stored in the directory
 180  * inode (which we intend to fix).
 181  *
 182  * File reads and writes are further protected by a range lock.  The intention
 183  * is to be able to break I/O operations down into more easily managed pieces
 184  * so vm_page arrays can be passed through rather then UIOs.  This work will
 185  * occur in multiple stages.  The range locks will also eventually be used to
 186  * deal with clustered cache coherency issues and, more immediately, to
 187  * protect operations associated with the kernel-managed journaling module.
 188  *
 189  * Certain fields within the vnode structure requires v_token to be held.
 190  *
 191  *      v_rbclean_tree
 192  *      v_rbdirty_tree
 193  *      v_rbhash_tree
 194  *      v_pollinfo
 195  *
 196  * NOTE: The vnode operations vector, v_ops, is a double-indirect that
 197  *       typically points to &v_mount->mnt_vn_use_ops.  We use a double
 198  *       pointer because mnt_vn_use_ops may change dynamically when e.g.
 199  *       journaling is turned on or off.
 200  *
 201  * NOTE: v_filesize is currently only applicable when a VM object is
 202  *       associated with the vnode.  Otherwise it will be set to NOOFFSET.
 203  */
 204 RB_HEAD(buf_rb_tree, buf);
 205 RB_HEAD(buf_rb_hash, buf);
 206
 207 struct vnode {
 208         int     v_flag;                         /* vnode flags (see below) */
 209         int     v_writecount;
 210         int     v_opencount;                    /* number of explicit opens */
 211         int     v_auxrefs;                      /* auxiliary references */
 212         struct sysref v_sysref;                 /* normal references */
 213         struct bio_track v_track_read;          /* track I/O's in progress */
 214         struct bio_track v_track_write;         /* track I/O's in progress */
 215         struct mount *v_mount;                  /* ptr to vfs we are in */
 216         struct vop_ops **v_ops;                 /* vnode operations vector */
 217         TAILQ_ENTRY(vnode) v_freelist;          /* vnode freelist */
 218         TAILQ_ENTRY(vnode) v_nmntvnodes;        /* vnodes for mount point */
 219         struct buf_rb_tree v_rbclean_tree;      /* RB tree of clean bufs */
 220         struct buf_rb_tree v_rbdirty_tree;      /* RB tree of dirty bufs */
 221         struct buf_rb_hash v_rbhash_tree;       /* RB tree general lookup */
 222         LIST_ENTRY(vnode) v_synclist;           /* vnodes with dirty buffers */
 223         enum    vtype v_type;                   /* vnode type */
 224         union {
 225                 struct socket   *vu_socket;     /* unix ipc (VSOCK) */
 226                 struct {
 227                         int     vu_umajor;      /* device number for attach */
 228                         int     vu_uminor;
 229                         struct cdev     *vu_cdevinfo; /* device (VCHR, VBLK) */
 230                         SLIST_ENTRY(vnode) vu_cdevnext;
 231                 } vu_cdev;
 232                 struct fifoinfo *vu_fifoinfo;   /* fifo (VFIFO) */
 233         } v_un;
 234         off_t   v_filesize;                     /* file EOF or NOOFFSET */
 235         off_t   v_lazyw;                        /* lazy write iterator */
 236         off_t   v_lastw;                        /* last write (write cluster) */
 237         off_t   v_cstart;                       /* start block of cluster */
 238         off_t   v_lasta;                        /* last allocation */
 239         int     v_clen;                         /* length of current cluster */
 240         struct vm_object *v_object;             /* Place to store VM object */
 241         struct  lock v_lock;                    /* file/dir ops lock */
 242         struct  lwkt_token v_token;             /* structural access */
 243         enum    vtagtype v_tag;                 /* type of underlying data */
 244         void    *v_data;                        /* private data for fs */
 245         struct namecache_list v_namecache;      /* associated nc entries */
 246         struct  {
 247                 struct  selinfo vpi_selinfo;    /* identity of poller(s) */
 248                 short   vpi_events;             /* what they are looking for */
 249                 short   vpi_revents;            /* what has happened */
 250         } v_pollinfo;
 251         struct vmresident *v_resident;          /* optional vmresident */
 252         struct vrangehead v_range;              /* range lock */
 253         struct ccms_dataspace v_ccms;           /* cache coherency */
 254 #ifdef  DEBUG_LOCKS
 255         const char *filename;                   /* Source file doing locking */
 256         int line;                               /* Line number doing locking */
 257 #endif
 258         void    *v_xaddr;
 259 };
 260 #define v_socket        v_un.vu_socket
 261 #define v_umajor        v_un.vu_cdev.vu_umajor
 262 #define v_uminor        v_un.vu_cdev.vu_uminor
 263 #define v_rdev          v_un.vu_cdev.vu_cdevinfo
 264 #define v_cdevnext      v_un.vu_cdev.vu_cdevnext
 265 #define v_fifoinfo      v_un.vu_fifoinfo
 266 #define v_spinlock      v_lock.lk_spinlock
 267
 268 #define VN_POLLEVENT(vp, events)                                \
 269         do {                                                    \
 270                 if ((vp)->v_pollinfo.vpi_events & (events))     \
 271                         vn_pollevent((vp), (events));           \
 272         } while (0)
 273
 274 /*
 275  * Vnode flags.
 276  */
 277 #define VROOT           0x00000001      /* root of its file system */
 278 #define VTEXT           0x00000002      /* vnode is a pure text prototype */
 279 #define VSYSTEM         0x00000004      /* vnode being used by kernel */
 280 #define VISTTY          0x00000008      /* vnode represents a tty */
 281 #define VCTTYISOPEN     0x00000010      /* controlling terminal tty is open */
 282 #define VCKPT           0x00000020      /* checkpoint-restored vnode */
 283 #define VFSMID          0x00000040      /* request FSMID update */
 284 #define VMAYHAVELOCKS   0x00000080      /* maybe posix or flock locks on vp */
 285 #define VPFSROOT        0x00000100      /* may be a pseudo filesystem root */
 286 /* open for business    0x00000200 */
 287 /* open for business    0x00000400 */
 288 /* open for business    0x00000800 */
 289 #define VCACHED         0x00001000      /* No active references but has cache value */
 290 #define VOBJBUF         0x00002000      /* Allocate buffers in VM object */
 291 #define VINACTIVE       0x00004000      /* The vnode is inactive (did VOP_INACTIVE) */
 292 #define VAGE            0x00008000      /* Insert vnode at head of free list */
 293 #define VOLOCK          0x00010000      /* vnode is locked waiting for an object */
 294 #define VOWANT          0x00020000      /* a process is waiting for VOLOCK */
 295 #define VRECLAIMED      0x00040000      /* This vnode has been destroyed */
 296 #define VFREE           0x00080000      /* This vnode is on the freelist */
 297 #define VNOTSEEKABLE    0x00100000      /* rd/wr ignores file offset */
 298 #define VONWORKLST      0x00200000      /* On syncer work-list */
 299 #define VMOUNT          0x00400000      /* Mount in progress */
 300 #define VOBJDIRTY       0x00800000      /* object might be dirty */
 301
 302 #define VMP_READ        0x01000000      /* supports MPSAFE read */
 303 #define VMP_WRITE       0x02000000      /* supports MPSAFE write */
 304 #define VMP_GETATTR     0x04000000      /* supports MPSAFE getattr */
 305
 306 /*
 307  * vmntvnodescan() flags
 308  */
 309 #define VMSC_GETVP      0x01
 310 #define VMSC_GETVX      0x02
 311 #define VMSC_NOWAIT     0x10
 312 #define VMSC_ONEPASS    0x20
 313
 314 /*
 315  * Flags for ioflag. (high 16 bits used to ask for read-ahead and
 316  * help with write clustering)
 317  */
 318 #define IO_UNIT         0x0001          /* do I/O as atomic unit */
 319 #define IO_APPEND       0x0002          /* append write to end */
 320 #define IO_SYNC         0x0004          /* do I/O synchronously */
 321 #define IO_NODELOCKED   0x0008          /* underlying node already locked */
 322 #define IO_NDELAY       0x0010          /* FNDELAY flag set in file table */
 323 #define IO_VMIO         0x0020          /* data already in VMIO space */
 324 #define IO_INVAL        0x0040          /* invalidate after I/O */
 325 #define IO_ASYNC        0x0080          /* bawrite rather then bdwrite */
 326 #define IO_DIRECT       0x0100          /* attempt to bypass buffer cache */
 327 #define IO_RECURSE      0x0200          /* possibly device-recursive (vn) */
 328 #define IO_CORE         0x0400          /* I/O is part of core dump */
 329
 330 #define IO_SEQMAX       0x7F            /* seq heuristic max value */
 331 #define IO_SEQSHIFT     16              /* seq heuristic in upper 16 bits */
 332
 333 /*
 334  * Modes.  Note that these V-modes must match file S_I*USR, SUID, SGID,
 335  * and SVTX flag bits.
 336  */
 337 #define VSUID   04000           /* set user id on execution */
 338 #define VSGID   02000           /* set group id on execution */
 339 #define VSVTX   01000           /* save swapped text even after use */
 340 #define VREAD   00400           /* read, write, execute permissions */
 341 #define VWRITE  00200
 342 #define VEXEC   00100
 343
 344 /*
 345  * Token indicating no attribute value yet assigned.
 346  */
 347 #define VNOVAL  (-1)
 348
 349 /*
 350  * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
 351  */
 352 #define VLKTIMEOUT     (hz / 20 + 1)
 353
 354 #ifdef _KERNEL
 355
 356 /*
 357  * Convert between vnode types and inode formats (since POSIX.1
 358  * defines mode word of stat structure in terms of inode formats).
 359  */
 360 extern  enum vtype      iftovt_tab[];
 361 extern  int             vttoif_tab[];
 362 #define IFTOVT(mode)    (iftovt_tab[((mode) & S_IFMT) >> 12])
 363 #define VTTOIF(indx)    (vttoif_tab[(int)(indx)])
 364 #define MAKEIMODE(indx, mode)   (int)(VTTOIF(indx) | (mode))
 365
 366 /*
 367  * Flags to various vnode functions.
 368  */
 369 #define SKIPSYSTEM      0x0001          /* vflush: skip vnodes marked VSYSTEM */
 370 #define FORCECLOSE      0x0002          /* vflush: force file closure */
 371 #define WRITECLOSE      0x0004          /* vflush: only close writable files */
 372 #define DOCLOSE         0x0008          /* vclean: close active files */
 373 #define V_SAVE          0x0001          /* vinvalbuf: sync file first */
 374
 375 #ifdef DIAGNOSTIC
 376 #define VATTR_NULL(vap) vattr_null(vap)
 377 #else
 378 #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
 379 #endif /* DIAGNOSTIC */
 380
 381 #define NULLVP  ((struct vnode *)NULL)
 382
 383 #define VNODEOP_SET(f) \
 384         SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_nadd_vnodeops_sysinit, &f); \
 385         SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND,vfs_nrm_vnodeops_sysinit, &f);
 386
 387 /*
 388  * Global vnode data.
 389  */
 390 struct objcache;
 391
 392 extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
 393 extern  struct nchandle rootnch;        /* root (i.e. "/") namecache */
 394 extern  int desiredvnodes;              /* number of vnodes desired */
 395 extern  time_t syncdelay;               /* max time to delay syncing data */
 396 extern  time_t filedelay;               /* time to delay syncing files */
 397 extern  time_t dirdelay;                /* time to delay syncing directories */
 398 extern  time_t metadelay;               /* time to delay syncing metadata */
 399 extern  struct objcache *namei_oc;
 400 extern  int prtactive;                  /* nonzero to call vprint() */
 401 extern  struct vattr va_null;           /* predefined null vattr structure */
 402 extern  int vfs_ioopt;
 403 extern  int numvnodes;
 404 extern  int freevnodes;
 405 extern  int vfs_fastdev;                /* fast specfs device access */
 406
 407 /*
 408  * Interlock for scanning list of vnodes attached to a mountpoint
 409  */
 410 extern struct lwkt_token mntvnode_token;
 411
 412 /*
 413  * This macro is very helpful in defining those offsets in the vdesc struct.
 414  *
 415  * This is stolen from X11R4.  I ignored all the fancy stuff for
 416  * Crays, so if you decide to port this to such a serious machine,
 417  * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
 418  */
 419 #define VOPARG_OFFSET(p_type,field) \
 420         ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
 421 #define VOPARG_OFFSETOF(s_type,field) \
 422         VOPARG_OFFSET(s_type*,field)
 423 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
 424         ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
 425
 426 typedef int (*vnodeopv_entry_t)(struct vop_generic_args *);
 427
 428 /*
 429  * VOCALL calls an op given an ops vector.  We break it out because BSD's
 430  * vclean changes the ops vector and then wants to call ops with the old
 431  * vector.
 432  */
 433
 434 typedef int (*vocall_func_t)(struct vop_generic_args *);
 435
 436 /*
 437  * This call executes the vops vector for the offset stored in the ap's
 438  * descriptor of the passed vops rather then the one related to the
 439  * ap's vop_ops structure.  It is used to chain VOPS calls on behalf of
 440  * filesystems from a VFS's context ONLY (that is, from a VFS's own vops
 441  * vector function).
 442  */
 443 #define VOCALL(vops, ap)                \
 444         (*(vocall_func_t *)((char *)(vops)+((ap)->a_desc->sd_offset)))(ap)
 445
 446 #define VDESC(OP) (& __CONCAT(OP,_desc))
 447
 448 /*
 449  * Public vnode manipulation functions.
 450  */
 451 struct file;
 452 struct mount;
 453 struct nlookupdata;
 454 struct proc;
 455 struct thread;
 456 struct stat;
 457 struct ucred;
 458 struct uio;
 459 struct vattr;
 460 struct vnode;
 461
 462 struct vnode *getsynthvnode(const char *devname);
 463 void    addaliasu (struct vnode *vp, int x, int y);
 464 int     v_associate_rdev(struct vnode *vp, cdev_t dev);
 465 void    v_release_rdev(struct vnode *vp);
 466 int     bdevvp (cdev_t dev, struct vnode **vpp);
 467 struct vnode *allocvnode(int lktimeout, int lkflags);
 468 int     freesomevnodes(int count);
 469 int     getnewvnode (enum vtagtype tag, struct mount *mp,
 470                     struct vnode **vpp, int timo, int lkflags);
 471 int     getspecialvnode (enum vtagtype tag, struct mount *mp,
 472                     struct vop_ops **ops, struct vnode **vpp, int timo,
 473                     int lkflags);
 474 int     speedup_syncer (void);
 475 void    vattr_null (struct vattr *vap);
 476 int     vcount (struct vnode *vp);
 477 int     vfinddev (cdev_t dev, enum vtype type, struct vnode **vpp);
 478 void    vfs_nadd_vnodeops_sysinit (void *);
 479 void    vfs_nrm_vnodeops_sysinit (void *);
 480 void    vfs_add_vnodeops(struct mount *, struct vop_ops *, struct vop_ops **);
 481 void    vfs_rm_vnodeops(struct mount *, struct vop_ops *, struct vop_ops **);
 482 int     vflush (struct mount *mp, int rootrefs, int flags);
 483 int     vmntvnodescan(struct mount *mp, int flags,
 484             int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data),
 485             int (*slowfunc)(struct mount *mp, struct vnode *vp, void *data),
 486             void *data);
 487 void    insmntque(struct vnode *vp, struct mount *mp);
 488
 489 void    vclean_vxlocked (struct vnode *vp, int flags);
 490 void    vclean_unlocked (struct vnode *vp);
 491 void    vgone_vxlocked (struct vnode *vp);
 492 void    vupdatefsmid (struct vnode *vp);
 493 int     vrevoke (struct vnode *vp, struct ucred *cred);
 494 int     vinvalbuf (struct vnode *vp, int save, int slpflag, int slptimeo);
 495 int     vtruncbuf (struct vnode *vp, off_t length, int blksize);
 496 int     vfsync(struct vnode *vp, int waitfor, int passes,
 497                 int (*checkdef)(struct buf *),
 498                 int (*waitoutput)(struct vnode *, struct thread *));
 499 int     vinitvmio(struct vnode *vp, off_t filesize);
 500 void    vprint (char *label, struct vnode *vp);
 501 int     vrecycle (struct vnode *vp);
 502 int     vmaxiosize (struct vnode *vp);
 503 void    vn_strategy(struct vnode *vp, struct bio *bio);
 504 int     vn_close (struct vnode *vp, int flags);
 505 int     vn_isdisk (struct vnode *vp, int *errp);
 506 int     vn_lock (struct vnode *vp, int flags);
 507 int     vn_islocked (struct vnode *vp);
 508 void    vn_unlock (struct vnode *vp);
 509 #ifdef  DEBUG_LOCKS
 510 int     debug_vn_lock (struct vnode *vp, int flags,
 511                 const char *filename, int line);
 512 #define vn_lock(vp,flags)       debug_vn_lock(vp, flags, __FILE__, __LINE__)
 513 #endif
 514
 515 int     vn_get_namelen(struct vnode *, int *);
 516 void    vn_setspecops (struct file *fp);
 517 int     vn_fullpath (struct proc *p, struct vnode *vn, char **retbuf, char **freebuf);
 518 int     vn_open (struct nlookupdata *ndp, struct file *fp, int fmode, int cmode);
 519 int     vn_opendisk (const char *devname, int fmode, struct vnode **vpp);
 520 void    vn_pollevent (struct vnode *vp, int events);
 521 void    vn_pollgone (struct vnode *vp);
 522 int     vn_pollrecord (struct vnode *vp, int events);
 523 int     vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
 524             int len, off_t offset, enum uio_seg segflg, int ioflg,
 525             struct ucred *cred, int *aresid);
 526 int     vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
 527             int len, off_t offset, enum uio_seg segflg, int ioflg,
 528             struct ucred *cred, int *aresid);
 529 int     vn_stat (struct vnode *vp, struct stat *sb, struct ucred *cred);
 530 cdev_t  vn_todev (struct vnode *vp);
 531 void    vfs_timestamp (struct timespec *);
 532 size_t  vfs_flagstostr(int flags, const struct mountctl_opt *optp, char *buf, size_t len, int *errorp);
 533 void    vn_mark_atime(struct vnode *vp, struct thread *td);
 534 int     vn_writechk (struct vnode *vp, struct nchandle *nch);
 535 int     ncp_writechk(struct nchandle *nch);
 536 int     vop_stdopen (struct vop_open_args *ap);
 537 int     vop_stdclose (struct vop_close_args *ap);
 538 int     vop_stdmountctl(struct vop_mountctl_args *ap);
 539 int     vop_stdgetpages(struct vop_getpages_args *ap);
 540 int     vop_stdputpages(struct vop_putpages_args *ap);
 541 int     vop_stdmarkatime(struct vop_markatime_args *ap);
 542 int     vop_stdnoread(struct vop_read_args *ap);
 543 int     vop_stdnowrite(struct vop_write_args *ap);
 544 int     vop_nopoll (struct vop_poll_args *ap);
 545 int     vop_stdpathconf (struct vop_pathconf_args *ap);
 546 int     vop_stdpoll (struct vop_poll_args *ap);
 547 int     vop_eopnotsupp (struct vop_generic_args *ap);
 548 int     vop_ebadf (struct vop_generic_args *ap);
 549 int     vop_einval (struct vop_generic_args *ap);
 550 int     vop_enotty (struct vop_generic_args *ap);
 551 int     vop_defaultop (struct vop_generic_args *ap);
 552 int     vop_null (struct vop_generic_args *ap);
 553 int     vop_panic (struct vop_generic_args *ap);
 554 int     vop_write_dirent(int *, struct uio *, ino_t, uint8_t, uint16_t,
 555                          const char *);
 556
 557 int     vop_compat_nresolve(struct vop_nresolve_args *ap);
 558 int     vop_compat_nlookupdotdot(struct vop_nlookupdotdot_args *ap);
 559 int     vop_compat_ncreate(struct vop_ncreate_args *ap);
 560 int     vop_compat_nmkdir(struct vop_nmkdir_args *ap);
 561 int     vop_compat_nmknod(struct vop_nmknod_args *ap);
 562 int     vop_compat_nlink(struct vop_nlink_args *ap);
 563 int     vop_compat_nsymlink(struct vop_nsymlink_args *ap);
 564 int     vop_compat_nwhiteout(struct vop_nwhiteout_args *ap);
 565 int     vop_compat_nremove(struct vop_nremove_args *ap);
 566 int     vop_compat_nrmdir(struct vop_nrmdir_args *ap);
 567 int     vop_compat_nrename(struct vop_nrename_args *ap);
 568
 569 void    vx_lock (struct vnode *vp);
 570 void    vx_unlock (struct vnode *vp);
 571 void    vx_get (struct vnode *vp);
 572 int     vx_get_nonblock (struct vnode *vp);
 573 void    vx_put (struct vnode *vp);
 574 int     vget (struct vnode *vp, int lockflag);
 575 void    vput (struct vnode *vp);
 576 void    vhold (struct vnode *);
 577 void    vdrop (struct vnode *);
 578 void    vref (struct vnode *vp);
 579 void    vrele (struct vnode *vp);
 580 void    vsetflags (struct vnode *vp, int flags);
 581 void    vclrflags (struct vnode *vp, int flags);
 582
 583 void    vfs_subr_init(void);
 584 void    vfs_mount_init(void);
 585 void    vfs_lock_init(void);
 586 void    vfs_sync_init(void);
 587
 588 void    vn_syncer_add_to_worklist(struct vnode *, int);
 589 void    vnlru_proc_wait(void);
 590
 591 extern  struct vop_ops default_vnode_vops;
 592 extern  struct vop_ops dead_vnode_vops;
 593
 594 extern  struct vop_ops *default_vnode_vops_p;
 595 extern  struct vop_ops *dead_vnode_vops_p;
 596
 597 #endif  /* _KERNEL */
 598
 599 #endif  /* _KERNEL || _KERNEL_STRUCTURES */
 600 #endif  /* !_SYS_VNODE_H_ */