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 1.41 2006/03/05 18:38:36 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_VNODE_H_
  39 #define _SYS_VNODE_H_
  40
  41 #include <sys/queue.h>
  42 #include <sys/lock.h>
  43 #include <sys/select.h>
  44 #include <sys/biotrack.h>
  45 #include <sys/uio.h>
  46 #include <sys/acl.h>
  47 #include <sys/namecache.h>
  48 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  49 #include <sys/thread.h>
  50 #endif
  51 #include <sys/vfsops.h>
  52 #include <sys/vfscache.h>
  53 #include <sys/tree.h>
  54
  55 #include <machine/lock.h>
  56
  57 /*
  58  * The vnode is the focus of all file activity in UNIX.  There is a
  59  * unique vnode allocated for each active file, each current directory,
  60  * each mounted-on file, text file, and the root.
  61  */
  62
  63 /*
  64  * Each underlying filesystem allocates its own private area and hangs
  65  * it from v_data.  If non-null, this area is freed in getnewvnode().
  66  */
  67 TAILQ_HEAD(buflists, buf);
  68
  69 /*
  70  * Range locks protect offset ranges in files and directories at a high
  71  * level, allowing the actual I/O to be broken down into smaller pieces.
  72  * Range locks will eventually be integrated into the clustered cache
  73  * coherency infrastructure.
  74  *
  75  * We use a simple data structure for now, but eventually this should
  76  * probably be a btree or red-black tree.
  77  */
  78 struct vrangelock;
  79
  80 TAILQ_HEAD(vrangelock_list, vrangelock);
  81
  82 struct vrangehead {
  83         struct vrangelock_list  vh_list;
  84 };
  85
  86 struct vrangelock {
  87         TAILQ_ENTRY(vrangelock) vr_node;
  88         int             vr_flags;
  89         off_t           vr_offset;
  90         off_t           vr_length;
  91 };
  92
  93 #define RNGL_WAITING    0x0001          /* waiting for lock, else has lock */
  94 #define RNGL_CHECK      0x0002          /* check for work on unlock */
  95 #define RNGL_SHARED     0x0004          /* shared lock, else exclusive */
  96 #define RNGL_ONLIST     0x0008          /* sanity check */
  97
  98 static __inline
  99 void
 100 vrange_init(struct vrangelock *vr, int flags, off_t offset, off_t length)
 101 {
 102         vr->vr_flags = flags;
 103         vr->vr_offset = offset;
 104         vr->vr_length = length;
 105 }
 106
 107 #ifdef _KERNEL
 108
 109 void    vrange_lock(struct vnode *vp, struct vrangelock *vr);
 110 void    vrange_unlock(struct vnode *vp, struct vrangelock *vr);
 111
 112 static __inline
 113 void
 114 vrange_lock_shared(struct vnode *vp, struct vrangelock *vr,
 115                     off_t offset, off_t length)
 116 {
 117         vrange_init(vr, RNGL_SHARED, offset, length);
 118         vrange_lock(vp, vr);
 119 }
 120
 121 static __inline
 122 void
 123 vrange_lock_excl(struct vnode *vp, struct vrangelock *vr,
 124                     off_t offset, off_t length)
 125 {
 126         vrange_init(vr, 0, offset, length);
 127         vrange_lock(vp, vr);
 128 }
 129
 130 #endif
 131
 132 /*
 133  * The vnode infrastructure is being reorgranized.  Most reference-related
 134  * fields are locked by the BGL, and most file I/O related operations and
 135  * vnode teardown functions are locked by the vnode lock.
 136  *
 137  * File read operations require a shared lock, file write operations require
 138  * an exclusive lock.  Most directory operations (read or write) currently
 139  * require an exclusive lock due to the side effects stored in the directory
 140  * inode (which we intend to fix).
 141  *
 142  * File reads and writes are further protected by a range lock.  The intention
 143  * is to be able to break I/O operations down into more easily managed pieces
 144  * so vm_page arrays can be passed through rather then UIOs.  This work will
 145  * occur in multiple stages.  The range locks will also eventually be used to
 146  * deal with clustered cache coherency issues and, more immediately, to
 147  * protect operations associated with the kernel-managed journaling module.
 148  *
 149  * NOTE: XXX v_opencount currently only used by specfs.  It should be used
 150  *       universally.
 151  *
 152  * NOTE: The vnode operations vector, v_ops, is a double-indirect that
 153  *       typically points to &v_mount->mnt_vn_use_ops.  We use a double
 154  *       pointer because mnt_vn_use_ops may change dynamically when e.g.
 155  *       journaling is turned on or off.
 156  */
 157 RB_HEAD(buf_rb_tree, buf);
 158 RB_HEAD(buf_rb_hash, buf);
 159
 160 struct vnode {
 161         u_long  v_flag;                         /* vnode flags (see below) */
 162         int     v_usecount;                     /* reference count of users */
 163         int     v_writecount;
 164         int     v_holdcnt;                      /* page & buffer references */
 165         int     v_opencount;                    /* number of explicit opens */
 166         struct bio_track v_track_read;          /* track I/O's in progress */
 167         struct bio_track v_track_write;         /* track I/O's in progress */
 168         u_long  v_id;                           /* capability identifier */
 169         struct  mount *v_mount;                 /* ptr to vfs we are in */
 170         struct  vop_ops **v_ops;                /* vnode operations vector */
 171         TAILQ_ENTRY(vnode) v_freelist;          /* vnode freelist */
 172         TAILQ_ENTRY(vnode) v_nmntvnodes;        /* vnodes for mount point */
 173         struct buf_rb_tree v_rbclean_tree;      /* RB tree of clean bufs */
 174         struct buf_rb_tree v_rbdirty_tree;      /* RB tree of dirty bufs */
 175         struct buf_rb_hash v_rbhash_tree;       /* RB tree general lookup */
 176         LIST_ENTRY(vnode) v_synclist;           /* vnodes with dirty buffers */
 177         enum    vtype v_type;                   /* vnode type */
 178         union {
 179                 struct mount    *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
 180                 struct socket   *vu_socket;     /* unix ipc (VSOCK) */
 181                 struct {
 182                         udev_t  vu_udev;        /* device number for attach */
 183                         struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
 184                         SLIST_ENTRY(vnode) vu_specnext;
 185                 } vu_spec;
 186                 struct fifoinfo *vu_fifoinfo;   /* fifo (VFIFO) */
 187         } v_un;
 188         struct  nqlease *v_lease;               /* Soft reference to lease */
 189         daddr_t v_lazyw;                        /* lazy write iterator */
 190         daddr_t v_lastw;                        /* last write (write cluster) */
 191         daddr_t v_cstart;                       /* start block of cluster */
 192         daddr_t v_lasta;                        /* last allocation */
 193         int     v_clen;                         /* length of current cluster */
 194         struct vm_object *v_object;             /* Place to store VM object */
 195         struct  lock v_lock;                    /* file/dir ops lock */
 196         enum    vtagtype v_tag;                 /* type of underlying data */
 197         void    *v_data;                        /* private data for fs */
 198         struct namecache_list v_namecache;      /* associated nc entries */
 199         struct  {
 200                 struct  lwkt_token vpi_token;   /* lock to protect below */
 201                 struct  selinfo vpi_selinfo;    /* identity of poller(s) */
 202                 short   vpi_events;             /* what they are looking for */
 203                 short   vpi_revents;            /* what has happened */
 204         } v_pollinfo;
 205         struct vmresident *v_resident;          /* optional vmresident */
 206         struct vrangehead v_range;              /* range lock */
 207 #ifdef  DEBUG_LOCKS
 208         const char *filename;                   /* Source file doing locking */
 209         int line;                               /* Line number doing locking */
 210 #endif
 211         void    *v_xaddr;
 212 };
 213 #define v_mountedhere   v_un.vu_mountedhere
 214 #define v_socket        v_un.vu_socket
 215 #define v_udev          v_un.vu_spec.vu_udev
 216 #define v_rdev          v_un.vu_spec.vu_specinfo
 217 #define v_specnext      v_un.vu_spec.vu_specnext
 218 #define v_fifoinfo      v_un.vu_fifoinfo
 219
 220 #define VN_POLLEVENT(vp, events)                                \
 221         do {                                                    \
 222                 if ((vp)->v_pollinfo.vpi_events & (events))     \
 223                         vn_pollevent((vp), (events));           \
 224         } while (0)
 225
 226 /*
 227  * Vnode flags.
 228  */
 229 #define VROOT           0x00001 /* root of its file system */
 230 #define VTEXT           0x00002 /* vnode is a pure text prototype */
 231 #define VSYSTEM         0x00004 /* vnode being used by kernel */
 232 #define VISTTY          0x00008 /* vnode represents a tty */
 233 #define VCTTYISOPEN     0x00010 /* controlling terminal tty is open */
 234 #define VCKPT           0x00020 /* checkpoint-restored vnode */
 235 /* open for business    0x00040 */
 236 /* open for business    0x00080 */
 237 /* open for business    0x00100 */
 238 /* open for business    0x00200 */
 239 /* open for business    0x00400 */
 240 /* open for business    0x00800 */
 241 /* open for business    0x01000 */
 242 #define VOBJBUF         0x02000 /* Allocate buffers in VM object */
 243 #define VINACTIVE       0x04000 /* The vnode is inactive */
 244 #define VAGE            0x08000 /* Insert vnode at head of free list */
 245 #define VOLOCK          0x10000 /* vnode is locked waiting for an object */
 246 #define VOWANT          0x20000 /* a process is waiting for VOLOCK */
 247 #define VRECLAIMED      0x40000 /* This vnode has been destroyed */
 248 #define VFREE           0x80000 /* This vnode is on the freelist */
 249 /* open for business    0x100000 */
 250 #define VONWORKLST      0x200000 /* On syncer work-list */
 251 #define VMOUNT          0x400000 /* Mount in progress */
 252 #define VOBJDIRTY       0x800000 /* object might be dirty */
 253
 254 /*
 255  * vmntvnodescan() flags
 256  */
 257 #define VMSC_GETVP      1
 258 #define VMSC_GETVX      2
 259 #define VMSC_REFVP      3
 260 #define VMSC_NOWAIT     0x10
 261
 262 /*
 263  * Flags for ioflag. (high 16 bits used to ask for read-ahead and
 264  * help with write clustering)
 265  */
 266 #define IO_UNIT         0x0001          /* do I/O as atomic unit */
 267 #define IO_APPEND       0x0002          /* append write to end */
 268 #define IO_SYNC         0x0004          /* do I/O synchronously */
 269 #define IO_NODELOCKED   0x0008          /* underlying node already locked */
 270 #define IO_NDELAY       0x0010          /* FNDELAY flag set in file table */
 271 #define IO_VMIO         0x0020          /* data already in VMIO space */
 272 #define IO_INVAL        0x0040          /* invalidate after I/O */
 273 #define IO_ASYNC        0x0080          /* bawrite rather then bdwrite */
 274 #define IO_DIRECT       0x0100          /* attempt to bypass buffer cache */
 275 #define IO_NOWDRAIN     0x0200          /* do not block on wdrain */
 276 #define IO_CORE         0x0400          /* I/O is part of core dump */
 277
 278 #define IO_SEQMAX       0x7F            /* seq heuristic max value */
 279 #define IO_SEQSHIFT     16              /* seq heuristic in upper 16 bits */
 280
 281 /*
 282  * Modes.  Note that these V-modes must match file S_I*USR, SUID, SGID,
 283  * and SVTX flag bits.
 284  *
 285  * VCREATE, VDELETE, and VEXCL may only be used in naccess() calls.
 286  */
 287 #define VDELETE 040000          /* delete if the file/dir exists */
 288 #define VCREATE 020000          /* create if the file/dir does not exist */
 289 #define VEXCL   010000          /* error if the file/dir already exists */
 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 #define REVOKEALL       0x0001          /* vop_revoke: revoke all aliases */
 329
 330 #ifdef DIAGNOSTIC
 331 #define VATTR_NULL(vap) vattr_null(vap)
 332 #else
 333 #define VATTR_NULL(vap) (*(vap) = va_null)      /* initialize a vattr */
 334 #endif /* DIAGNOSTIC */
 335
 336 #define NULLVP  ((struct vnode *)NULL)
 337
 338 #define VNODEOP_SET(f) \
 339         C_SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_add_vnodeops_sysinit, &f); \
 340         C_SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND,vfs_rm_vnodeops_sysinit, &f);
 341
 342 /*
 343  * Global vnode data.
 344  */
 345 extern  struct vnode *rootvnode;        /* root (i.e. "/") vnode */
 346 extern  struct namecache *rootncp;      /* root (i.e. "/") namecache */
 347 extern  int desiredvnodes;              /* number of vnodes desired */
 348 extern  time_t syncdelay;               /* max time to delay syncing data */
 349 extern  time_t filedelay;               /* time to delay syncing files */
 350 extern  time_t dirdelay;                /* time to delay syncing directories */
 351 extern  time_t metadelay;               /* time to delay syncing metadata */
 352 extern  struct vm_zone *namei_zone;
 353 extern  int prtactive;                  /* nonzero to call vprint() */
 354 extern  struct vattr va_null;           /* predefined null vattr structure */
 355 extern  int vfs_ioopt;
 356 extern  int numvnodes;
 357 extern  int freevnodes;
 358 extern  int vfs_fastdev;                /* fast specfs device access */
 359
 360 /*
 361  * Macro/function to check for client cache inconsistency w.r.t. leasing.
 362  */
 363 #define LEASE_READ      0x1             /* Check lease for readers */
 364 #define LEASE_WRITE     0x2             /* Check lease for modifiers */
 365
 366
 367 extern void     (*lease_updatetime) (int deltat);
 368
 369 #endif /* _KERNEL */
 370
 371 /*
 372  * Mods for extensibility.
 373  */
 374
 375 /*
 376  * Flags for vdesc_flags:
 377  */
 378 #define VDESC_MAX_VPS           8
 379 /* Low order 8 flag bits are reserved for willrele flags for vp arguments. */
 380 #define VDESC_VP0_WILLRELE      0x00000001
 381 #define VDESC_VP1_WILLRELE      0x00000002
 382 #define VDESC_VP2_WILLRELE      0x00000004
 383 #define VDESC_VP3_WILLRELE      0x00000008
 384 #define VDESC_VP4_WILLRELE      0x00000010
 385 #define VDESC_VP5_WILLRELE      0x00000020
 386 #define VDESC_VP6_WILLRELE      0x00000040
 387 #define VDESC_VP7_WILLRELE      0x00000080
 388 #define VDESC_NOMAP_VPP         0x00000100
 389 #define VDESC_VPP_WILLRELE      0x00000200
 390 #define VDESC_VP0_WILLUNLOCK    0x00010000
 391 #define VDESC_VP1_WILLUNLOCK    0x00020000
 392 #define VDESC_VP2_WILLUNLOCK    0x00040000
 393 #define VDESC_VP3_WILLUNLOCK    0x00080000
 394 #define VDESC_VP4_WILLUNLOCK    0x00100000
 395 #define VDESC_VP5_WILLUNLOCK    0x00200000
 396 #define VDESC_VP6_WILLUNLOCK    0x00400000
 397 #define VDESC_VP7_WILLUNLOCK    0x00800000
 398
 399 /*
 400  * VDESC_NO_OFFSET is used to identify the end of the offset list
 401  * and in places where no such field exists.
 402  */
 403 #define VDESC_NO_OFFSET -1
 404
 405 /*
 406  * This structure describes the vnode operation taking place.
 407  */
 408 struct vnodeop_desc {
 409         int     vdesc_offset;           /* offset in vector--first for speed */
 410         char    *vdesc_name;            /* a readable name for debugging */
 411         int     vdesc_flags;            /* VDESC_* flags */
 412
 413         /*
 414          * These ops are used by bypass routines to map and locate arguments.
 415          * Creds and procs are not needed in bypass routines, but sometimes
 416          * they are useful to (for example) transport layers.
 417          * Nameidata is useful because it has a cred in it.
 418          */
 419         int     *vdesc_vp_offsets;      /* list ended by VDESC_NO_OFFSET */
 420         int     vdesc_vpp_offset;       /* return vpp location */
 421         int     vdesc_cred_offset;      /* cred location, if any */
 422         int     vdesc_proc_offset;      /* proc location, if any */
 423         int     vdesc_componentname_offset; /* if any */
 424 };
 425
 426 #ifdef _KERNEL
 427 /*
 428  * A list of all the operation descs.
 429  */
 430 extern struct vnodeop_desc *vnodeop_descs[];
 431
 432 /*
 433  * Interlock for scanning list of vnodes attached to a mountpoint
 434  */
 435 extern struct lwkt_token mntvnode_token;
 436
 437 /*
 438  * This macro is very helpful in defining those offsets in the vdesc struct.
 439  *
 440  * This is stolen from X11R4.  I ignored all the fancy stuff for
 441  * Crays, so if you decide to port this to such a serious machine,
 442  * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
 443  */
 444 #define VOPARG_OFFSET(p_type,field) \
 445         ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
 446 #define VOPARG_OFFSETOF(s_type,field) \
 447         VOPARG_OFFSET(s_type*,field)
 448 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
 449         ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
 450
 451 typedef int (*vnodeopv_entry_t)(struct vop_generic_args *);
 452
 453 /*
 454  * This structure is used to configure the new vnodeops vector.  The entry
 455  * descriptor describes a patricular VOP function while the operations
 456  * vector descriptor recursively describes arrays of entry descriptors.
 457  */
 458 struct vnodeopv_entry_desc {
 459         struct vnodeop_desc *opve_op;
 460         vnodeopv_entry_t opve_func;
 461 };
 462
 463 struct vnodeopv_desc {
 464         struct vop_ops **opv_desc_vector;           /* vect to allocate/fill*/
 465         struct vnodeopv_entry_desc *opv_desc_ops;   /* null terminated list */
 466         int opv_flags;
 467 };
 468
 469 struct vnodeopv_node {
 470         TAILQ_ENTRY(vnodeopv_node)      entry;
 471         struct vop_ops                  *ops;       /* allocated vector */
 472         struct vnodeopv_entry_desc      *descs;     /* null terminated list */
 473 };
 474
 475 #ifdef DEBUG_VFS_LOCKS
 476 /*
 477  * Macros to aid in tracing VFS locking problems.  Not totally
 478  * reliable since if the process sleeps between changing the lock
 479  * state and checking it with the assert, some other process could
 480  * change the state.  They are good enough for debugging a single
 481  * filesystem using a single-threaded test.  I find that 'cvs co src'
 482  * is a pretty good test.
 483  */
 484
 485 /*
 486  * [dfr] Kludge until I get around to fixing all the vfs locking.
 487  */
 488 #define IS_LOCKING_VFS(vp)      ((vp)->v_tag == VT_UFS          \
 489                                  || (vp)->v_tag == VT_MFS       \
 490                                  || (vp)->v_tag == VT_NFS       \
 491                                  || (vp)->v_tag == VT_LFS       \
 492                                  || (vp)->v_tag == VT_ISOFS     \
 493                                  || (vp)->v_tag == VT_MSDOSFS)
 494
 495 #define ASSERT_VOP_LOCKED(vp, str) assert_vop_locked(vp, str)
 496 #define ASSERT_VOP_UNLOCKED(vp, str) assert_vop_unlocked(vp, str);
 497
 498 #define ASSERT_VOP_ELOCKED(vp, str)                                     \
 499 do {                                                                    \
 500         struct vnode *_vp = (vp);                                       \
 501                                                                         \
 502         if (_vp && IS_LOCKING_VFS(_vp) &&                               \
 503             VOP_ISLOCKED(_vp, curthread) != LK_EXCLUSIVE)               \
 504                 panic("%s: %p is not exclusive locked but should be",   \
 505                     str, _vp);                                          \
 506 } while (0)
 507
 508 #define ASSERT_VOP_ELOCKED_OTHER(vp, str)                               \
 509 do {                                                                    \
 510         struct vnode *_vp = (vp);                                       \
 511                                                                         \
 512         if (_vp && IS_LOCKING_VFS(_vp) &&                               \
 513             VOP_ISLOCKED(_vp, curthread) != LK_EXCLOTHER)               \
 514                 panic("%s: %p is not exclusive locked by another proc", \
 515                     str, _vp);                                          \
 516 } while (0)
 517
 518 #define ASSERT_VOP_SLOCKED(vp, str)                                     \
 519 do {                                                                    \
 520         struct vnode *_vp = (vp);                                       \
 521                                                                         \
 522         if (_vp && IS_LOCKING_VFS(_vp) &&                               \
 523             VOP_ISLOCKED(_vp, NULL) != LK_SHARED)                       \
 524                 panic("%s: %p is not locked shared but should be",      \
 525                     str, _vp);                                          \
 526 } while (0)
 527
 528 void    assert_vop_locked(struct vnode *vp, const char *str);
 529 void    assert_vop_unlocked(struct vnode *vp, const char *str);
 530
 531 #else
 532
 533 #define ASSERT_VOP_LOCKED(vp, str)
 534 #define ASSERT_VOP_UNLOCKED(vp, str)
 535
 536 #endif /* DEBUG_VFS_LOCKS */
 537
 538 /*
 539  * VOCALL calls an op given an ops vector.  We break it out because BSD's
 540  * vclean changes the ops vector and then wants to call ops with the old
 541  * vector.
 542  */
 543
 544 typedef int (*vocall_func_t)(struct vop_generic_args *);
 545
 546 /*
 547  * This call executes the vops vector for the offset stored in the ap's
 548  * descriptor of the passed vops rather then the one related to the
 549  * ap's vop_ops structure.  It is used to chain VOPS calls on behalf of
 550  * filesystems from a VFS's context ONLY (that is, from a VFS's own vops
 551  * vector function).
 552  */
 553 #define VOCALL(vops, ap)                \
 554         (*(vocall_func_t *)((char *)(vops)+((ap)->a_desc->vdesc_offset)))(ap)
 555
 556 #define VDESC(OP) (& __CONCAT(OP,_desc))
 557 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
 558
 559 /*
 560  * VMIO support inline
 561  */
 562
 563 extern int vmiodirenable;
 564
 565 static __inline int
 566 vn_canvmio(struct vnode *vp)
 567 {
 568     if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
 569         return(TRUE);
 570     return(FALSE);
 571 }
 572
 573 /*
 574  * Public vnode manipulation functions.
 575  */
 576 struct file;
 577 struct mount;
 578 struct nlookupdata;
 579 struct proc;
 580 struct thread;
 581 struct stat;
 582 struct ucred;
 583 struct uio;
 584 struct vattr;
 585 struct vnode;
 586 struct vop_bwrite_args;
 587
 588 extern int      (*lease_check_hook) (struct vop_lease_args *);
 589
 590 void    addaliasu (struct vnode *vp, udev_t nvp_udev);
 591 int     v_associate_rdev(struct vnode *vp, dev_t dev);
 592 void    v_release_rdev(struct vnode *vp);
 593 int     bdevvp (dev_t dev, struct vnode **vpp);
 594 struct vnode *allocvnode(int lktimeout, int lkflags);
 595 int     getnewvnode (enum vtagtype tag, struct mount *mp,
 596                     struct vnode **vpp, int timo, int lkflags);
 597 int     getspecialvnode (enum vtagtype tag, struct mount *mp,
 598                     struct vop_ops **ops, struct vnode **vpp, int timo,
 599                     int lkflags);
 600 int     lease_check (struct vop_lease_args *ap);
 601 int     spec_vnoperate (struct vop_generic_args *);
 602 int     speedup_syncer (void);
 603 void    vattr_null (struct vattr *vap);
 604 int     vcount (struct vnode *vp);
 605 int     vfinddev (dev_t dev, enum vtype type, struct vnode **vpp);
 606 void    vfs_add_vnodeops_sysinit (const void *);
 607 void    vfs_rm_vnodeops_sysinit (const void *);
 608 void    vfs_add_vnodeops(struct mount *, struct vop_ops **,
 609                         struct vnodeopv_entry_desc *, int);
 610 void    vfs_rm_vnodeops(struct vop_ops **);
 611 int     vflush (struct mount *mp, int rootrefs, int flags);
 612 int     vmntvnodescan(struct mount *mp, int flags,
 613             int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data),
 614             int (*slowfunc)(struct mount *mp, struct vnode *vp, void *data),
 615             void *data);
 616 void    insmntque(struct vnode *vp, struct mount *mp);
 617
 618 void    vclean (struct vnode *vp, int flags, struct thread *td);
 619 void    vgone (struct vnode *vp);
 620 int     vinvalbuf (struct vnode *vp, int save,
 621             struct thread *td, int slpflag, int slptimeo);
 622 int     vtruncbuf (struct vnode *vp, struct thread *td,
 623                 off_t length, int blksize);
 624 int     vfsync(struct vnode *vp, int waitfor, int passes, daddr_t lbn,
 625                 int (*checkdef)(struct buf *),
 626                 int (*waitoutput)(struct vnode *, struct thread *));
 627 void    vprint (char *label, struct vnode *vp);
 628 int     vrecycle (struct vnode *vp, struct thread *td);
 629 void    vn_strategy(struct vnode *vp, struct bio *bio);
 630 int     vn_close (struct vnode *vp, int flags, struct thread *td);
 631 int     vn_isdisk (struct vnode *vp, int *errp);
 632 int     vn_lock (struct vnode *vp, int flags, struct thread *td);
 633 #ifdef  DEBUG_LOCKS
 634 int     debug_vn_lock (struct vnode *vp, int flags, struct thread *td,
 635             const char *filename, int line);
 636 #define vn_lock(vp,flags,p) debug_vn_lock(vp,flags,p,__FILE__,__LINE__)
 637 #endif
 638
 639 int     vn_get_namelen(struct vnode *, int *);
 640 void    vn_setspecops (struct file *fp);
 641 int     vn_fullpath (struct proc *p, struct vnode *vn, char **retbuf, char **freebuf);
 642 int     vn_open (struct nlookupdata *ndp, struct file *fp, int fmode, int cmode);
 643 void    vn_pollevent (struct vnode *vp, int events);
 644 void    vn_pollgone (struct vnode *vp);
 645 int     vn_pollrecord (struct vnode *vp, struct thread *td, int events);
 646 int     vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
 647             int len, off_t offset, enum uio_seg segflg, int ioflg,
 648             struct ucred *cred, int *aresid, struct thread *td);
 649 int     vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
 650             int len, off_t offset, enum uio_seg segflg, int ioflg,
 651             struct ucred *cred, int *aresid, struct thread *td);
 652 int     vn_stat (struct vnode *vp, struct stat *sb, struct thread *td);
 653 dev_t   vn_todev (struct vnode *vp);
 654 int     vfs_object_create (struct vnode *vp, struct thread *td);
 655 void    vfs_timestamp (struct timespec *);
 656 int     vn_writechk (struct vnode *vp);
 657 int     vop_stdbwrite (struct vop_bwrite_args *ap);
 658 int     vop_stdislocked (struct vop_islocked_args *ap);
 659 int     vop_stdlock (struct vop_lock_args *ap);
 660 int     vop_stdrlock (struct vop_lock_args *ap);
 661 int     vop_stdunlock (struct vop_unlock_args *ap);
 662 int     vop_nopoll (struct vop_poll_args *ap);
 663 int     vop_stdpathconf (struct vop_pathconf_args *ap);
 664 int     vop_stdpoll (struct vop_poll_args *ap);
 665 int     vop_stdrevoke (struct vop_revoke_args *ap);
 666 int     vop_eopnotsupp (struct vop_generic_args *ap);
 667 int     vop_ebadf (struct vop_generic_args *ap);
 668 int     vop_einval (struct vop_generic_args *ap);
 669 int     vop_enotty (struct vop_generic_args *ap);
 670 int     vop_defaultop (struct vop_generic_args *ap);
 671 int     vop_null (struct vop_generic_args *ap);
 672 int     vop_panic (struct vop_generic_args *ap);
 673 int     vop_stdcreatevobject (struct vop_createvobject_args *ap);
 674 int     vop_stddestroyvobject (struct vop_destroyvobject_args *ap);
 675 int     vop_stdgetvobject (struct vop_getvobject_args *ap);
 676 int     vop_write_dirent(int *, struct uio *, ino_t, uint8_t, uint16_t,
 677                          const char *);
 678
 679 int     vop_compat_nresolve(struct vop_nresolve_args *ap);
 680 int     vop_compat_nlookupdotdot(struct vop_nlookupdotdot_args *ap);
 681 int     vop_compat_ncreate(struct vop_ncreate_args *ap);
 682 int     vop_compat_nmkdir(struct vop_nmkdir_args *ap);
 683 int     vop_compat_nmknod(struct vop_nmknod_args *ap);
 684 int     vop_compat_nlink(struct vop_nlink_args *ap);
 685 int     vop_compat_nsymlink(struct vop_nsymlink_args *ap);
 686 int     vop_compat_nwhiteout(struct vop_nwhiteout_args *ap);
 687 int     vop_compat_nremove(struct vop_nremove_args *ap);
 688 int     vop_compat_nrmdir(struct vop_nrmdir_args *ap);
 689 int     vop_compat_nrename(struct vop_nrename_args *ap);
 690
 691 int     vx_lock (struct vnode *vp);
 692 void    vx_unlock (struct vnode *vp);
 693 int     vx_get (struct vnode *vp);
 694 int     vx_get_nonblock (struct vnode *vp);
 695 void    vx_put (struct vnode *vp);
 696 int     vget (struct vnode *vp, int lockflag, struct thread *td);
 697 void    vput (struct vnode *vp);
 698 void    vhold (struct vnode *);
 699 void    vdrop (struct vnode *);
 700 void    vref (struct vnode *vp);
 701 void    vrele (struct vnode *vp);
 702 void    vsetflags (struct vnode *vp, int flags);
 703 void    vclrflags (struct vnode *vp, int flags);
 704
 705 void    vfs_subr_init(void);
 706 void    vfs_mount_init(void);
 707 void    vfs_lock_init(void);
 708 void    vfs_sync_init(void);
 709
 710 void    vn_syncer_add_to_worklist(struct vnode *, int);
 711 void    vnlru_proc_wait(void);
 712
 713 extern  struct vop_ops *default_vnode_vops;
 714 extern  struct vop_ops *spec_vnode_vops;
 715 extern  struct vop_ops *dead_vnode_vops;
 716
 717 #endif /* _KERNEL */
 718
 719 #endif /* !_SYS_VNODE_H_ */