FreeBSD/Linux Kernel Cross Reference
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 * 4. 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: releng/6.1/sys/sys/vnode.h 158179 2006-04-30 16:44:43Z cvs2svn $
31 */
32
33 #ifndef _SYS_VNODE_H_
34 #define _SYS_VNODE_H_
35
36 /*
37 * XXX - compatability until lockmgr() goes away or all the #includes are
38 * updated.
39 */
40 #include <sys/lockmgr.h>
41
42 #include <sys/bufobj.h>
43 #include <sys/queue.h>
44 #include <sys/_lock.h>
45 #include <sys/lock.h>
46 #include <sys/_mutex.h>
47 #include <sys/mutex.h>
48 #include <sys/selinfo.h>
49 #include <sys/uio.h>
50 #include <sys/acl.h>
51 #include <sys/ktr.h>
52
53 /*
54 * The vnode is the focus of all file activity in UNIX. There is a
55 * unique vnode allocated for each active file, each current directory,
56 * each mounted-on file, text file, and the root.
57 */
58
59 /*
60 * Vnode types. VNON means no type.
61 */
62 enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD,
63 VMARKER };
64
65 /*
66 * Each underlying filesystem allocates its own private area and hangs
67 * it from v_data. If non-null, this area is freed in getnewvnode().
68 */
69
70 struct namecache;
71
72 struct vpollinfo {
73 struct mtx vpi_lock; /* lock to protect below */
74 struct selinfo vpi_selinfo; /* identity of poller(s) */
75 short vpi_events; /* what they are looking for */
76 short vpi_revents; /* what has happened */
77 };
78
79 /*
80 * Reading or writing any of these items requires holding the appropriate lock.
81 *
82 * Lock reference:
83 * c - namecache mutex
84 * f - freelist mutex
85 * G - Giant
86 * i - interlock
87 * m - mntvnodes mutex
88 * p - pollinfo lock
89 * s - spechash mutex
90 * S - syncer mutex
91 * u - Only a reference to the vnode is needed to read.
92 * v - vnode lock
93 *
94 * Vnodes may be found on many lists. The general way to deal with operating
95 * on a vnode that is on a list is:
96 * 1) Lock the list and find the vnode.
97 * 2) Lock interlock so that the vnode does not go away.
98 * 3) Unlock the list to avoid lock order reversals.
99 * 4) vget with LK_INTERLOCK and check for ENOENT, or
100 * 5) Check for DOOMED if the vnode lock is not required.
101 * 6) Perform your operation, then vput().
102 *
103 * XXX Not all fields are locked yet and some fields that are marked are not
104 * locked consistently. This is a work in progress. Requires Giant!
105 */
106
107 #if defined(_KERNEL) || defined(_KVM_VNODE)
108
109 struct vnode {
110 /*
111 * Fields which define the identity of the vnode. These fields are
112 * owned by the filesystem (XXX: and vgone() ?)
113 */
114 enum vtype v_type; /* u vnode type */
115 const char *v_tag; /* u type of underlying data */
116 struct vop_vector *v_op; /* u vnode operations vector */
117 void *v_data; /* u private data for fs */
118
119 /*
120 * Filesystem instance stuff
121 */
122 struct mount *v_mount; /* u ptr to vfs we are in */
123 TAILQ_ENTRY(vnode) v_nmntvnodes; /* m vnodes for mount point */
124
125 /*
126 * Type specific fields, only one applies to any given vnode.
127 * See #defines below for renaming to v_* namespace.
128 */
129 union {
130 struct mount *vu_mount; /* v ptr to mountpoint (VDIR) */
131 struct socket *vu_socket; /* v unix domain net (VSOCK) */
132 struct cdev *vu_cdev; /* v device (VCHR, VBLK) */
133 struct fifoinfo *vu_fifoinfo; /* v fifo (VFIFO) */
134 } v_un;
135
136 /*
137 * vfs_hash: (mount + inode) -> vnode hash.
138 */
139 LIST_ENTRY(vnode) v_hashlist;
140 u_int v_hash;
141
142 /*
143 * VFS_namecache stuff
144 */
145 LIST_HEAD(, namecache) v_cache_src; /* c Cache entries from us */
146 TAILQ_HEAD(, namecache) v_cache_dst; /* c Cache entries to us */
147 struct vnode *v_dd; /* c .. vnode */
148
149 /*
150 * clustering stuff
151 */
152 daddr_t v_cstart; /* v start block of cluster */
153 daddr_t v_lasta; /* v last allocation */
154 daddr_t v_lastw; /* v last write */
155 int v_clen; /* v length of cur. cluster */
156
157 /*
158 * Locking
159 */
160 struct lock v_lock; /* u (if fs don't have one) */
161 struct mtx v_interlock; /* lock for "i" things */
162 struct lock *v_vnlock; /* u pointer to vnode lock */
163 int v_holdcnt; /* i prevents recycling. */
164 int v_usecount; /* i ref count of users */
165 u_long v_iflag; /* i vnode flags (see below) */
166 u_long v_vflag; /* v vnode flags */
167 int v_writecount; /* v ref count of writers */
168
169 /*
170 * The machinery of being a vnode
171 */
172 TAILQ_ENTRY(vnode) v_freelist; /* f vnode freelist */
173 struct bufobj v_bufobj; /* * Buffer cache object */
174
175 /*
176 * Hooks for various subsystems and features.
177 */
178 struct vpollinfo *v_pollinfo; /* G Poll events, p for *v_pi */
179 struct label *v_label; /* MAC label for vnode */
180 };
181
182 #endif /* defined(_KERNEL) || defined(_KVM_VNODE) */
183
184 #define v_mountedhere v_un.vu_mount
185 #define v_socket v_un.vu_socket
186 #define v_rdev v_un.vu_cdev
187 #define v_fifoinfo v_un.vu_fifoinfo
188
189 /* XXX: These are temporary to avoid a source sweep at this time */
190 #define v_object v_bufobj.bo_object
191
192 /*
193 * Userland version of struct vnode, for sysctl.
194 */
195 struct xvnode {
196 size_t xv_size; /* sizeof(struct xvnode) */
197 void *xv_vnode; /* address of real vnode */
198 u_long xv_flag; /* vnode vflags */
199 int xv_usecount; /* reference count of users */
200 int xv_writecount; /* reference count of writers */
201 int xv_holdcnt; /* page & buffer references */
202 u_long xv_id; /* capability identifier */
203 void *xv_mount; /* address of parent mount */
204 long xv_numoutput; /* num of writes in progress */
205 enum vtype xv_type; /* vnode type */
206 union {
207 void *xvu_socket; /* socket, if VSOCK */
208 void *xvu_fifo; /* fifo, if VFIFO */
209 dev_t xvu_rdev; /* maj/min, if VBLK/VCHR */
210 struct {
211 dev_t xvu_dev; /* device, if VDIR/VREG/VLNK */
212 ino_t xvu_ino; /* id, if VDIR/VREG/VLNK */
213 } xv_uns;
214 } xv_un;
215 };
216 #define xv_socket xv_un.xvu_socket
217 #define xv_fifo xv_un.xvu_fifo
218 #define xv_rdev xv_un.xvu_rdev
219 #define xv_dev xv_un.xv_uns.xvu_dev
220 #define xv_ino xv_un.xv_uns.xvu_ino
221
222 /* We don't need to lock the knlist */
223 #define VN_KNLIST_EMPTY(vp) ((vp)->v_pollinfo == NULL || \
224 KNLIST_EMPTY(&(vp)->v_pollinfo->vpi_selinfo.si_note))
225
226 #define VN_KNOTE(vp, b, a) \
227 do { \
228 if (!VN_KNLIST_EMPTY(vp)) \
229 KNOTE(&vp->v_pollinfo->vpi_selinfo.si_note, (b), (a)); \
230 } while (0)
231 #define VN_KNOTE_LOCKED(vp, b) VN_KNOTE(vp, b, 1)
232 #define VN_KNOTE_UNLOCKED(vp, b) VN_KNOTE(vp, b, 0)
233
234 /*
235 * Vnode flags.
236 * VI flags are protected by interlock and live in v_iflag
237 * VV flags are protected by the vnode lock and live in v_vflag
238 */
239 #define VI_MOUNT 0x0020 /* Mount in progress */
240 #define VI_AGE 0x0040 /* Insert vnode at head of free list */
241 #define VI_DOOMED 0x0080 /* This vnode is being recycled */
242 #define VI_FREE 0x0100 /* This vnode is on the freelist */
243 #define VI_OBJDIRTY 0x0400 /* object might be dirty */
244 #define VI_DOINGINACT 0x0800 /* VOP_INACTIVE is in progress */
245 #define VI_OWEINACT 0x1000 /* Need to call inactive */
246
247 #define VV_ROOT 0x0001 /* root of its filesystem */
248 #define VV_ISTTY 0x0002 /* vnode represents a tty */
249 #define VV_NOSYNC 0x0004 /* unlinked, stop syncing */
250 #define VV_CACHEDLABEL 0x0010 /* Vnode has valid cached MAC label */
251 #define VV_TEXT 0x0020 /* vnode is a pure text prototype */
252 #define VV_COPYONWRITE 0x0040 /* vnode is doing copy-on-write */
253 #define VV_SYSTEM 0x0080 /* vnode being used by kernel */
254 #define VV_PROCDEP 0x0100 /* vnode is process dependent */
255 #define VV_NOKNOTE 0x0200 /* don't activate knotes on this vnode */
256
257 /*
258 * Vnode attributes. A field value of VNOVAL represents a field whose value
259 * is unavailable (getattr) or which is not to be changed (setattr).
260 */
261 struct vattr {
262 enum vtype va_type; /* vnode type (for create) */
263 u_short va_mode; /* files access mode and type */
264 short va_nlink; /* number of references to file */
265 uid_t va_uid; /* owner user id */
266 gid_t va_gid; /* owner group id */
267 dev_t va_fsid; /* filesystem id */
268 long va_fileid; /* file id */
269 u_quad_t va_size; /* file size in bytes */
270 long va_blocksize; /* blocksize preferred for i/o */
271 struct timespec va_atime; /* time of last access */
272 struct timespec va_mtime; /* time of last modification */
273 struct timespec va_ctime; /* time file changed */
274 struct timespec va_birthtime; /* time file created */
275 u_long va_gen; /* generation number of file */
276 u_long va_flags; /* flags defined for file */
277 dev_t va_rdev; /* device the special file represents */
278 u_quad_t va_bytes; /* bytes of disk space held by file */
279 u_quad_t va_filerev; /* file modification number */
280 u_int va_vaflags; /* operations flags, see below */
281 long va_spare; /* remain quad aligned */
282 };
283
284 /*
285 * Flags for va_vaflags.
286 */
287 #define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */
288 #define VA_EXCLUSIVE 0x02 /* exclusive create request */
289 #define VA_MARK_ATIME 0x04 /* setting atime for execve/mmap */
290
291 /*
292 * Flags for ioflag. (high 16 bits used to ask for read-ahead and
293 * help with write clustering)
294 * NB: IO_NDELAY and IO_DIRECT are linked to fcntl.h
295 */
296 #define IO_UNIT 0x0001 /* do I/O as atomic unit */
297 #define IO_APPEND 0x0002 /* append write to end */
298 #define IO_NDELAY 0x0004 /* FNDELAY flag set in file table */
299 #define IO_NODELOCKED 0x0008 /* underlying node already locked */
300 #define IO_ASYNC 0x0010 /* bawrite rather then bdwrite */
301 #define IO_VMIO 0x0020 /* data already in VMIO space */
302 #define IO_INVAL 0x0040 /* invalidate after I/O */
303 #define IO_SYNC 0x0080 /* do I/O synchronously */
304 #define IO_DIRECT 0x0100 /* attempt to bypass buffer cache */
305 #define IO_EXT 0x0400 /* operate on external attributes */
306 #define IO_NORMAL 0x0800 /* operate on regular data */
307 #define IO_NOMACCHECK 0x1000 /* MAC checks unnecessary */
308
309 #define IO_SEQMAX 0x7F /* seq heuristic max value */
310 #define IO_SEQSHIFT 16 /* seq heuristic in upper 16 bits */
311
312 /*
313 * Modes. Some values same as Ixxx entries from inode.h for now.
314 */
315 #define VEXEC 000100 /* execute/search permission */
316 #define VWRITE 000200 /* write permission */
317 #define VREAD 000400 /* read permission */
318 #define VSVTX 001000 /* save swapped text even after use */
319 #define VSGID 002000 /* set group id on execution */
320 #define VSUID 004000 /* set user id on execution */
321 #define VADMIN 010000 /* permission to administer */
322 #define VSTAT 020000 /* permission to retrieve attrs */
323 #define VAPPEND 040000 /* permission to write/append */
324 #define VALLPERM (VEXEC | VWRITE | VREAD | VADMIN | VSTAT | VAPPEND)
325
326 /*
327 * Token indicating no attribute value yet assigned.
328 */
329 #define VNOVAL (-1)
330
331 /*
332 * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
333 */
334 #define VLKTIMEOUT (hz / 20 + 1)
335
336 #ifdef _KERNEL
337
338 #ifdef MALLOC_DECLARE
339 MALLOC_DECLARE(M_VNODE);
340 #endif
341
342 /*
343 * Convert between vnode types and inode formats (since POSIX.1
344 * defines mode word of stat structure in terms of inode formats).
345 */
346 extern enum vtype iftovt_tab[];
347 extern int vttoif_tab[];
348 #define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12])
349 #define VTTOIF(indx) (vttoif_tab[(int)(indx)])
350 #define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode))
351
352 /*
353 * Flags to various vnode functions.
354 */
355 #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
356 #define FORCECLOSE 0x0002 /* vflush: force file closure */
357 #define WRITECLOSE 0x0004 /* vflush: only close writable files */
358 #define DOCLOSE 0x0008 /* vclean: close active files */
359 #define V_SAVE 0x0001 /* vinvalbuf: sync file first */
360 #define V_ALT 0x0002 /* vinvalbuf: invalidate only alternate bufs */
361 #define V_NORMAL 0x0004 /* vinvalbuf: invalidate only regular bufs */
362 #define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */
363 #define V_WAIT 0x0001 /* vn_start_write: sleep for suspend */
364 #define V_NOWAIT 0x0002 /* vn_start_write: don't sleep for suspend */
365 #define V_XSLEEP 0x0004 /* vn_start_write: just return after sleep */
366
367 #define VREF(vp) vref(vp)
368
369 #ifdef DIAGNOSTIC
370 #define VATTR_NULL(vap) vattr_null(vap)
371 #else
372 #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
373 #endif /* DIAGNOSTIC */
374
375 #define NULLVP ((struct vnode *)NULL)
376
377 /*
378 * Global vnode data.
379 */
380 extern struct vnode *rootvnode; /* root (i.e. "/") vnode */
381 extern int async_io_version; /* 0 or POSIX version of AIO i'face */
382 extern int desiredvnodes; /* number of vnodes desired */
383 extern struct uma_zone *namei_zone;
384 extern int prtactive; /* nonzero to call vprint() */
385 extern struct vattr va_null; /* predefined null vattr structure */
386
387 /*
388 * Macro/function to check for client cache inconsistency w.r.t. leasing.
389 */
390 #define LEASE_READ 0x1 /* Check lease for readers */
391 #define LEASE_WRITE 0x2 /* Check lease for modifiers */
392
393 extern void (*lease_updatetime)(int deltat);
394
395 #define VI_LOCK(vp) mtx_lock(&(vp)->v_interlock)
396 #define VI_LOCK_FLAGS(vp, flags) mtx_lock_flags(&(vp)->v_interlock, (flags))
397 #define VI_TRYLOCK(vp) mtx_trylock(&(vp)->v_interlock)
398 #define VI_UNLOCK(vp) mtx_unlock(&(vp)->v_interlock)
399 #define VI_MTX(vp) (&(vp)->v_interlock)
400
401 #endif /* _KERNEL */
402
403 /*
404 * Mods for extensibility.
405 */
406
407 /*
408 * Flags for vdesc_flags:
409 */
410 #define VDESC_MAX_VPS 16
411 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
412 #define VDESC_VP0_WILLRELE 0x0001
413 #define VDESC_VP1_WILLRELE 0x0002
414 #define VDESC_VP2_WILLRELE 0x0004
415 #define VDESC_VP3_WILLRELE 0x0008
416 #define VDESC_NOMAP_VPP 0x0100
417 #define VDESC_VPP_WILLRELE 0x0200
418
419 /*
420 * A generic structure.
421 * This can be used by bypass routines to identify generic arguments.
422 */
423 struct vop_generic_args {
424 struct vnodeop_desc *a_desc;
425 /* other random data follows, presumably */
426 };
427
428 typedef int vop_bypass_t(struct vop_generic_args *);
429
430 /*
431 * VDESC_NO_OFFSET is used to identify the end of the offset list
432 * and in places where no such field exists.
433 */
434 #define VDESC_NO_OFFSET -1
435
436 /*
437 * This structure describes the vnode operation taking place.
438 */
439 struct vnodeop_desc {
440 char *vdesc_name; /* a readable name for debugging */
441 int vdesc_flags; /* VDESC_* flags */
442 vop_bypass_t *vdesc_call; /* Function to call */
443
444 /*
445 * These ops are used by bypass routines to map and locate arguments.
446 * Creds and procs are not needed in bypass routines, but sometimes
447 * they are useful to (for example) transport layers.
448 * Nameidata is useful because it has a cred in it.
449 */
450 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */
451 int vdesc_vpp_offset; /* return vpp location */
452 int vdesc_cred_offset; /* cred location, if any */
453 int vdesc_thread_offset; /* thread location, if any */
454 int vdesc_componentname_offset; /* if any */
455 /*
456 * Finally, we've got a list of private data (about each operation)
457 * for each transport layer. (Support to manage this list is not
458 * yet part of BSD.)
459 */
460 caddr_t *vdesc_transports;
461 };
462
463 #ifdef _KERNEL
464 /*
465 * A list of all the operation descs.
466 */
467 extern struct vnodeop_desc *vnodeop_descs[];
468
469 #define VOPARG_OFFSETOF(s_type, field) __offsetof(s_type, field)
470 #define VOPARG_OFFSETTO(s_type, s_offset, struct_p) \
471 ((s_type)(((char*)(struct_p)) + (s_offset)))
472
473
474 #ifdef DEBUG_VFS_LOCKS
475 /*
476 * Support code to aid in debugging VFS locking problems. Not totally
477 * reliable since if the thread sleeps between changing the lock
478 * state and checking it with the assert, some other thread could
479 * change the state. They are good enough for debugging a single
480 * filesystem using a single-threaded test.
481 */
482 void assert_vi_locked(struct vnode *vp, const char *str);
483 void assert_vi_unlocked(struct vnode *vp, const char *str);
484 void assert_vop_elocked(struct vnode *vp, const char *str);
485 #if 0
486 void assert_vop_elocked_other(struct vnode *vp, const char *str);
487 #endif
488 void assert_vop_locked(struct vnode *vp, const char *str);
489 #if 0
490 voi0 assert_vop_slocked(struct vnode *vp, const char *str);
491 #endif
492 void assert_vop_unlocked(struct vnode *vp, const char *str);
493
494 #define ASSERT_VI_LOCKED(vp, str) assert_vi_locked((vp), (str))
495 #define ASSERT_VI_UNLOCKED(vp, str) assert_vi_unlocked((vp), (str))
496 #define ASSERT_VOP_ELOCKED(vp, str) assert_vop_elocked((vp), (str))
497 #if 0
498 #define ASSERT_VOP_ELOCKED_OTHER(vp, str) assert_vop_locked_other((vp), (str))
499 #endif
500 #define ASSERT_VOP_LOCKED(vp, str) assert_vop_locked((vp), (str))
501 #if 0
502 #define ASSERT_VOP_SLOCKED(vp, str) assert_vop_slocked((vp), (str))
503 #endif
504 #define ASSERT_VOP_UNLOCKED(vp, str) assert_vop_unlocked((vp), (str))
505
506 #else /* !DEBUG_VFS_LOCKS */
507
508 #define ASSERT_VI_LOCKED(vp, str)
509 #define ASSERT_VI_UNLOCKED(vp, str)
510 #define ASSERT_VOP_ELOCKED(vp, str)
511 #if 0
512 #define ASSERT_VOP_ELOCKED_OTHER(vp, str)
513 #endif
514 #define ASSERT_VOP_LOCKED(vp, str)
515 #if 0
516 #define ASSERT_VOP_SLOCKED(vp, str)
517 #endif
518 #define ASSERT_VOP_UNLOCKED(vp, str)
519 #endif /* DEBUG_VFS_LOCKS */
520
521
522 /*
523 * This call works for vnodes in the kernel.
524 */
525 #define VCALL(c) ((c)->a_desc->vdesc_call(c))
526
527 /*
528 * VMIO support inline
529 */
530
531 extern int vmiodirenable;
532
533 static __inline int
534 vn_canvmio(struct vnode *vp)
535 {
536 if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
537 return(TRUE);
538 return(FALSE);
539 }
540
541 /*
542 * Finally, include the default set of vnode operations.
543 */
544 #include "vnode_if.h"
545
546 /*
547 * Public vnode manipulation functions.
548 */
549 struct componentname;
550 struct file;
551 struct mount;
552 struct nameidata;
553 struct ostat;
554 struct thread;
555 struct proc;
556 struct stat;
557 struct nstat;
558 struct ucred;
559 struct uio;
560 struct vattr;
561 struct vnode;
562
563 extern int (*lease_check_hook)(struct vop_lease_args *);
564
565 /* cache_* may belong in namei.h. */
566 void cache_enter(struct vnode *dvp, struct vnode *vp,
567 struct componentname *cnp);
568 int cache_lookup(struct vnode *dvp, struct vnode **vpp,
569 struct componentname *cnp);
570 void cache_purge(struct vnode *vp);
571 void cache_purgevfs(struct mount *mp);
572 int cache_leaf_test(struct vnode *vp);
573 int change_dir(struct vnode *vp, struct thread *td);
574 int change_root(struct vnode *vp, struct thread *td);
575 void cvtstat(struct stat *st, struct ostat *ost);
576 void cvtnstat(struct stat *sb, struct nstat *nsb);
577 int getnewvnode(const char *tag, struct mount *mp, struct vop_vector *vops,
578 struct vnode **vpp);
579 u_quad_t init_va_filerev(void);
580 int lease_check(struct vop_lease_args *ap);
581 int speedup_syncer(void);
582 #define textvp_fullpath(p, rb, rfb) \
583 vn_fullpath(FIRST_THREAD_IN_PROC(p), (p)->p_textvp, rb, rfb)
584 int vn_fullpath(struct thread *td, struct vnode *vn,
585 char **retbuf, char **freebuf);
586 int vaccess(enum vtype type, mode_t file_mode, uid_t file_uid,
587 gid_t file_gid, mode_t acc_mode, struct ucred *cred,
588 int *privused);
589 int vaccess_acl_posix1e(enum vtype type, uid_t file_uid,
590 gid_t file_gid, struct acl *acl, mode_t acc_mode,
591 struct ucred *cred, int *privused);
592 void vattr_null(struct vattr *vap);
593 int vcount(struct vnode *vp);
594 void vdrop(struct vnode *);
595 void vfs_add_vnodeops(const void *);
596 void vfs_rm_vnodeops(const void *);
597 int vflush(struct mount *mp, int rootrefs, int flags, struct thread *td);
598 int vget(struct vnode *vp, int lockflag, struct thread *td);
599 void vgone(struct vnode *vp);
600 void vhold(struct vnode *);
601 void vholdl(struct vnode *);
602 int vinvalbuf(struct vnode *vp, int save,
603 struct thread *td, int slpflag, int slptimeo);
604 int vtruncbuf(struct vnode *vp, struct ucred *cred, struct thread *td,
605 off_t length, int blksize);
606 void vn_printf(struct vnode *vp, const char *fmt, ...) __printflike(2,3);
607 #define vprint(label, vp) vn_printf((vp), "%s\n", (label))
608 int vrecycle(struct vnode *vp, struct thread *td);
609 int vn_close(struct vnode *vp,
610 int flags, struct ucred *file_cred, struct thread *td);
611 void vn_finished_write(struct mount *mp);
612 void vn_finished_secondary_write(struct mount *mp);
613 int vn_isdisk(struct vnode *vp, int *errp);
614 int vn_lock(struct vnode *vp, int flags, struct thread *td);
615 int vn_open(struct nameidata *ndp, int *flagp, int cmode, int fdidx);
616 int vn_open_cred(struct nameidata *ndp, int *flagp, int cmode,
617 struct ucred *cred, int fdidx);
618 int vn_pollrecord(struct vnode *vp, struct thread *p, int events);
619 int vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base,
620 int len, off_t offset, enum uio_seg segflg, int ioflg,
621 struct ucred *active_cred, struct ucred *file_cred, int *aresid,
622 struct thread *td);
623 int vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base,
624 size_t len, off_t offset, enum uio_seg segflg, int ioflg,
625 struct ucred *active_cred, struct ucred *file_cred, size_t *aresid,
626 struct thread *td);
627 int vn_stat(struct vnode *vp, struct stat *sb, struct ucred *active_cred,
628 struct ucred *file_cred, struct thread *td);
629 int vn_start_write(struct vnode *vp, struct mount **mpp, int flags);
630 int vn_start_secondary_write(struct vnode *vp, struct mount **mpp,
631 int flags);
632 int vn_write_suspend_wait(struct vnode *vp, struct mount *mp,
633 int flags);
634 int vn_writechk(struct vnode *vp);
635 int vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace,
636 const char *attrname, int *buflen, char *buf, struct thread *td);
637 int vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace,
638 const char *attrname, int buflen, char *buf, struct thread *td);
639 int vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace,
640 const char *attrname, struct thread *td);
641 int vfs_cache_lookup(struct vop_lookup_args *ap);
642 void vfs_timestamp(struct timespec *);
643 void vfs_write_resume(struct mount *mp);
644 int vfs_write_suspend(struct mount *mp);
645 int vop_stdbmap(struct vop_bmap_args *);
646 int vop_stdfsync(struct vop_fsync_args *);
647 int vop_stdgetwritemount(struct vop_getwritemount_args *);
648 int vop_stdgetpages(struct vop_getpages_args *);
649 int vop_stdinactive(struct vop_inactive_args *);
650 int vop_stdislocked(struct vop_islocked_args *);
651 int vop_stdkqfilter(struct vop_kqfilter_args *);
652 int vop_stdlock(struct vop_lock_args *);
653 int vop_stdputpages(struct vop_putpages_args *);
654 int vop_stdunlock(struct vop_unlock_args *);
655 int vop_nopoll(struct vop_poll_args *);
656 int vop_stdpathconf(struct vop_pathconf_args *);
657 int vop_stdpoll(struct vop_poll_args *);
658 int vop_eopnotsupp(struct vop_generic_args *ap);
659 int vop_ebadf(struct vop_generic_args *ap);
660 int vop_einval(struct vop_generic_args *ap);
661 int vop_enotty(struct vop_generic_args *ap);
662 int vop_null(struct vop_generic_args *ap);
663 int vop_panic(struct vop_generic_args *ap);
664
665 /* These are called from within the actual VOPS. */
666 void vop_create_post(void *a, int rc);
667 void vop_link_post(void *a, int rc);
668 void vop_lock_pre(void *a);
669 void vop_lock_post(void *a, int rc);
670 void vop_lookup_post(void *a, int rc);
671 void vop_lookup_pre(void *a);
672 void vop_mkdir_post(void *a, int rc);
673 void vop_mknod_post(void *a, int rc);
674 void vop_remove_post(void *a, int rc);
675 void vop_rename_post(void *a, int rc);
676 void vop_rename_pre(void *a);
677 void vop_rmdir_post(void *a, int rc);
678 void vop_setattr_post(void *a, int rc);
679 void vop_strategy_pre(void *a);
680 void vop_symlink_post(void *a, int rc);
681 void vop_unlock_post(void *a, int rc);
682 void vop_unlock_pre(void *a);
683
684 #define VOP_WRITE_PRE(ap) \
685 struct vattr va; \
686 int error, osize, ooffset, noffset; \
687 \
688 osize = ooffset = noffset = 0; \
689 if (!VN_KNLIST_EMPTY((ap)->a_vp)) { \
690 error = VOP_GETATTR((ap)->a_vp, &va, (ap)->a_cred, \
691 curthread); \
692 if (error) \
693 return (error); \
694 ooffset = (ap)->a_uio->uio_offset; \
695 osize = va.va_size; \
696 }
697
698 #define VOP_WRITE_POST(ap, ret) \
699 noffset = (ap)->a_uio->uio_offset; \
700 if (noffset > ooffset && !VN_KNLIST_EMPTY((ap)->a_vp)) { \
701 VFS_KNOTE_LOCKED((ap)->a_vp, NOTE_WRITE \
702 | (noffset > osize ? NOTE_EXTEND : 0)); \
703 }
704
705 void vput(struct vnode *vp);
706 void vrele(struct vnode *vp);
707 void vref(struct vnode *vp);
708 int vrefcnt(struct vnode *vp);
709 void v_addpollinfo(struct vnode *vp);
710
711 int vnode_create_vobject(struct vnode *vp, size_t size, struct thread *td);
712 int vnode_create_vobject_off(struct vnode *vp, off_t size, struct thread *td);
713 void vnode_destroy_vobject(struct vnode *vp);
714
715 extern struct vop_vector fifo_specops;
716 extern struct vop_vector dead_vnodeops;
717 extern struct vop_vector default_vnodeops;
718
719 #define VOP_PANIC ((void*)(uintptr_t)vop_panic)
720 #define VOP_NULL ((void*)(uintptr_t)vop_null)
721 #define VOP_EBADF ((void*)(uintptr_t)vop_ebadf)
722 #define VOP_ENOTTY ((void*)(uintptr_t)vop_enotty)
723 #define VOP_EINVAL ((void*)(uintptr_t)vop_einval)
724 #define VOP_EOPNOTSUPP ((void*)(uintptr_t)vop_eopnotsupp)
725
726 /* vfs_hash.c */
727 typedef int vfs_hash_cmp_t(struct vnode *vp, void *arg);
728
729 int vfs_hash_get(struct mount *mp, u_int hash, int flags, struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
730 int vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
731 void vfs_hash_rehash(struct vnode *vp, u_int hash);
732 void vfs_hash_remove(struct vnode *vp);
733
734 int vfs_kqfilter(struct vop_kqfilter_args *);
735 void vfs_mark_atime(struct vnode *vp, struct thread *td);
736 struct dirent;
737 int vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off);
738
739 #endif /* _KERNEL */
740
741 #endif /* !_SYS_VNODE_H_ */
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