2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 1.22 2004/09/04 23:12:53 dillon Exp $
41 #include <sys/queue.h>
43 #include <sys/select.h>
46 #include <sys/namecache.h>
47 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
48 #include <sys/thread.h>
50 #include <sys/vfsops.h>
51 #include <sys/vfscache.h>
53 #include <machine/lock.h>
56 * The vnode is the focus of all file activity in UNIX. There is a
57 * unique vnode allocated for each active file, each current directory,
58 * each mounted-on file, text file, and the root.
62 * Each underlying filesystem allocates its own private area and hangs
63 * it from v_data. If non-null, this area is freed in getnewvnode().
65 TAILQ_HEAD(buflists, buf);
69 * Reading or writing any of these items requires holding the appropriate lock.
70 * v_freelist is locked by the global vnode_free_list token.
71 * v_mntvnodes is locked by the global mntvnodes token.
72 * v_flag, v_usecount, v_holdcount and v_writecount are
73 * locked by the v_interlock token.
74 * v_pollinfo is locked by the lock contained inside it.
76 * NOTE: XXX v_opencount currently only used by specfs. It should be used
79 * NOTE: The v_vnlock pointer is now an embedded lock structure, v_lock.
80 * v_lock is currently locked exclusively for writes but when a
81 * range lock is added later on it will be locked shared for writes
82 * and a range will be exclusively reserved in the rangelock space.
83 * v_lock is currently locked exclusively for directory modifying
84 * operations but when we start locking namespaces it will no longer
85 * be used for that function, only for the actual I/O on the directory.
88 u_long v_flag; /* vnode flags (see below) */
89 int v_usecount; /* reference count of users */
90 int v_writecount; /* reference count of writers */
91 int v_holdcnt; /* page & buffer references */
92 int v_opencount; /* number of explicit opens */
93 u_long v_id; /* capability identifier */
94 struct mount *v_mount; /* ptr to vfs we are in */
95 struct vop_ops *v_ops; /* mount, vops, other things */
96 TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */
97 TAILQ_ENTRY(vnode) v_nmntvnodes; /* vnodes for mount point */
98 struct buflists v_cleanblkhd; /* clean blocklist head */
99 struct buflists v_dirtyblkhd; /* dirty blocklist head */
100 LIST_ENTRY(vnode) v_synclist; /* vnodes with dirty buffers */
101 long v_numoutput; /* num of writes in progress */
102 enum vtype v_type; /* vnode type */
104 struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
105 struct socket *vu_socket; /* unix ipc (VSOCK) */
107 udev_t vu_udev; /* device number for attach */
108 struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
109 SLIST_ENTRY(vnode) vu_specnext;
111 struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */
113 struct nqlease *v_lease; /* Soft reference to lease */
114 daddr_t v_lastw; /* last write (write cluster) */
115 daddr_t v_cstart; /* start block of cluster */
116 daddr_t v_lasta; /* last allocation */
117 int v_clen; /* length of current cluster */
118 struct vm_object *v_object; /* Place to store VM object */
119 lwkt_token_t v_interlock; /* lock on usecount and flag */
120 struct lock v_lock; /* file/dir ops lock */
121 enum vtagtype v_tag; /* type of underlying data */
122 void *v_data; /* private data for fs */
123 struct namecache_list v_namecache; /* associated nc entries */
125 struct lwkt_token vpi_token; /* lock to protect below */
126 struct selinfo vpi_selinfo; /* identity of poller(s) */
127 short vpi_events; /* what they are looking for */
128 short vpi_revents; /* what has happened */
130 struct thread *v_vxthread; /* thread owning VXLOCK */
131 struct vmresident *v_resident; /* optional vmresident */
133 const char *filename; /* Source file doing locking */
134 int line; /* Line number doing locking */
137 #define v_mountedhere v_un.vu_mountedhere
138 #define v_socket v_un.vu_socket
139 #define v_udev v_un.vu_spec.vu_udev
140 #define v_rdev v_un.vu_spec.vu_specinfo
141 #define v_specnext v_un.vu_spec.vu_specnext
142 #define v_fifoinfo v_un.vu_fifoinfo
144 #define VN_POLLEVENT(vp, events) \
146 if ((vp)->v_pollinfo.vpi_events & (events)) \
147 vn_pollevent((vp), (events)); \
153 #define VROOT 0x00001 /* root of its file system */
154 #define VTEXT 0x00002 /* vnode is a pure text prototype */
155 #define VSYSTEM 0x00004 /* vnode being used by kernel */
156 #define VISTTY 0x00008 /* vnode represents a tty */
157 #define VXLOCK 0x00100 /* vnode is locked to change underlying type */
158 #define VXWANT 0x00200 /* process is waiting for vnode */
159 #define VBWAIT 0x00400 /* waiting for output to complete */
160 /* open for business 0x00800 */
161 /* open for business 0x01000 */
162 #define VOBJBUF 0x02000 /* Allocate buffers in VM object */
163 /* open for business 0x04000 */
164 #define VAGE 0x08000 /* Insert vnode at head of free list */
165 #define VOLOCK 0x10000 /* vnode is locked waiting for an object */
166 #define VOWANT 0x20000 /* a process is waiting for VOLOCK */
167 #define VDOOMED 0x40000 /* This vnode is being recycled */
168 #define VFREE 0x80000 /* This vnode is on the freelist */
169 #define VINFREE 0x100000 /* This vnode is in the midst of being freed */
170 #define VONWORKLST 0x200000 /* On syncer work-list */
171 #define VMOUNT 0x400000 /* Mount in progress */
172 #define VOBJDIRTY 0x800000 /* object might be dirty */
173 #define VPLACEMARKER 0x1000000 /* dummy vnode placemarker */
176 * Flags for ioflag. (high 16 bits used to ask for read-ahead and
177 * help with write clustering)
179 #define IO_UNIT 0x0001 /* do I/O as atomic unit */
180 #define IO_APPEND 0x0002 /* append write to end */
181 #define IO_SYNC 0x0004 /* do I/O synchronously */
182 #define IO_NODELOCKED 0x0008 /* underlying node already locked */
183 #define IO_NDELAY 0x0010 /* FNDELAY flag set in file table */
184 #define IO_VMIO 0x0020 /* data already in VMIO space */
185 #define IO_INVAL 0x0040 /* invalidate after I/O */
186 #define IO_ASYNC 0x0080 /* bawrite rather then bdwrite */
187 #define IO_DIRECT 0x0100 /* attempt to bypass buffer cache */
188 #define IO_NOWDRAIN 0x0200 /* do not block on wdrain */
189 #define IO_CORE 0x0400 /* I/O is part of core dump */
191 #define IO_SEQMAX 0x7F /* seq heuristic max value */
192 #define IO_SEQSHIFT 16 /* seq heuristic in upper 16 bits */
195 * Modes. Some values same as Ixxx entries from inode.h for now.
197 #define VSUID 04000 /* set user id on execution */
198 #define VSGID 02000 /* set group id on execution */
199 #define VSVTX 01000 /* save swapped text even after use */
200 #define VREAD 00400 /* read, write, execute permissions */
205 * Token indicating no attribute value yet assigned.
210 * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
212 #define VLKTIMEOUT (hz / 20 + 1)
216 #ifdef MALLOC_DECLARE
217 MALLOC_DECLARE(M_VNODE);
221 * Convert between vnode types and inode formats (since POSIX.1
222 * defines mode word of stat structure in terms of inode formats).
224 extern enum vtype iftovt_tab[];
225 extern int vttoif_tab[];
226 #define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12])
227 #define VTTOIF(indx) (vttoif_tab[(int)(indx)])
228 #define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode))
231 * Flags to various vnode functions.
233 #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
234 #define FORCECLOSE 0x0002 /* vflush: force file closure */
235 #define WRITECLOSE 0x0004 /* vflush: only close writable files */
236 #define DOCLOSE 0x0008 /* vclean: close active files */
237 #define V_SAVE 0x0001 /* vinvalbuf: sync file first */
238 #define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */
241 #define VATTR_NULL(vap) vattr_null(vap)
243 #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
244 #endif /* DIAGNOSTIC */
246 #define NULLVP ((struct vnode *)NULL)
248 #define VNODEOP_SET(f) \
249 C_SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_add_vnodeops_sysinit, &f); \
250 C_SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND,vfs_rm_vnodeops_sysinit, &f);
255 extern struct vnode *rootvnode; /* root (i.e. "/") vnode */
256 extern int desiredvnodes; /* number of vnodes desired */
257 extern time_t syncdelay; /* max time to delay syncing data */
258 extern time_t filedelay; /* time to delay syncing files */
259 extern time_t dirdelay; /* time to delay syncing directories */
260 extern time_t metadelay; /* time to delay syncing metadata */
261 extern struct vm_zone *namei_zone;
262 extern int prtactive; /* nonzero to call vprint() */
263 extern struct vattr va_null; /* predefined null vattr structure */
264 extern int vfs_ioopt;
267 * Macro/function to check for client cache inconsistency w.r.t. leasing.
269 #define LEASE_READ 0x1 /* Check lease for readers */
270 #define LEASE_WRITE 0x2 /* Check lease for modifiers */
273 extern void (*lease_updatetime) (int deltat);
275 #define VI_LOCK(vlock, vp) lwkt_gettoken(vlock, (vp)->v_interlock)
276 #define VI_UNLOCK(vlock, vp) lwkt_reltoken(vlock)
281 * Mods for extensibility.
285 * Flags for vdesc_flags:
287 #define VDESC_MAX_VPS 8
288 /* Low order 8 flag bits are reserved for willrele flags for vp arguments. */
289 #define VDESC_VP0_WILLRELE 0x00000001
290 #define VDESC_VP1_WILLRELE 0x00000002
291 #define VDESC_VP2_WILLRELE 0x00000004
292 #define VDESC_VP3_WILLRELE 0x00000008
293 #define VDESC_VP4_WILLRELE 0x00000010
294 #define VDESC_VP5_WILLRELE 0x00000020
295 #define VDESC_VP6_WILLRELE 0x00000040
296 #define VDESC_VP7_WILLRELE 0x00000080
297 #define VDESC_NOMAP_VPP 0x00000100
298 #define VDESC_VPP_WILLRELE 0x00000200
299 #define VDESC_VP0_WILLUNLOCK 0x00010000
300 #define VDESC_VP1_WILLUNLOCK 0x00020000
301 #define VDESC_VP2_WILLUNLOCK 0x00040000
302 #define VDESC_VP3_WILLUNLOCK 0x00080000
303 #define VDESC_VP4_WILLUNLOCK 0x00100000
304 #define VDESC_VP5_WILLUNLOCK 0x00200000
305 #define VDESC_VP6_WILLUNLOCK 0x00400000
306 #define VDESC_VP7_WILLUNLOCK 0x00800000
309 * VDESC_NO_OFFSET is used to identify the end of the offset list
310 * and in places where no such field exists.
312 #define VDESC_NO_OFFSET -1
315 * This structure describes the vnode operation taking place.
317 struct vnodeop_desc {
318 int vdesc_offset; /* offset in vector--first for speed */
319 char *vdesc_name; /* a readable name for debugging */
320 int vdesc_flags; /* VDESC_* flags */
323 * These ops are used by bypass routines to map and locate arguments.
324 * Creds and procs are not needed in bypass routines, but sometimes
325 * they are useful to (for example) transport layers.
326 * Nameidata is useful because it has a cred in it.
328 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */
329 int vdesc_vpp_offset; /* return vpp location */
330 int vdesc_cred_offset; /* cred location, if any */
331 int vdesc_proc_offset; /* proc location, if any */
332 int vdesc_componentname_offset; /* if any */
337 * A list of all the operation descs.
339 extern struct vnodeop_desc *vnodeop_descs[];
342 * Interlock for scanning list of vnodes attached to a mountpoint
344 extern struct lwkt_token mntvnode_token;
347 * This macro is very helpful in defining those offsets in the vdesc struct.
349 * This is stolen from X11R4. I ignored all the fancy stuff for
350 * Crays, so if you decide to port this to such a serious machine,
351 * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
353 #define VOPARG_OFFSET(p_type,field) \
354 ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
355 #define VOPARG_OFFSETOF(s_type,field) \
356 VOPARG_OFFSET(s_type*,field)
357 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
358 ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
362 * This structure is used to configure the new vnodeops vector. The entry
363 * descriptor describes a patricular VOP function while the operations
364 * vector descriptor recursively describes arrays of entry descriptors.
366 struct vnodeopv_entry_desc {
367 struct vnodeop_desc *opve_op;
368 int (*opve_func)(struct vop_generic_args *ap);
371 struct vnodeopv_desc {
372 struct vop_ops **opv_desc_vector; /* vect to allocate/fill*/
373 struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
376 struct vnodeopv_node {
377 TAILQ_ENTRY(vnodeopv_node) entry;
378 struct vop_ops *ops; /* allocated vector */
379 struct vnodeopv_entry_desc *descs; /* null terminated list */
382 #ifdef DEBUG_VFS_LOCKS
384 * Macros to aid in tracing VFS locking problems. Not totally
385 * reliable since if the process sleeps between changing the lock
386 * state and checking it with the assert, some other process could
387 * change the state. They are good enough for debugging a single
388 * filesystem using a single-threaded test. I find that 'cvs co src'
389 * is a pretty good test.
393 * [dfr] Kludge until I get around to fixing all the vfs locking.
395 #define IS_LOCKING_VFS(vp) ((vp)->v_tag == VT_UFS \
396 || (vp)->v_tag == VT_MFS \
397 || (vp)->v_tag == VT_NFS \
398 || (vp)->v_tag == VT_LFS \
399 || (vp)->v_tag == VT_ISOFS \
400 || (vp)->v_tag == VT_MSDOSFS)
402 #define ASSERT_VOP_LOCKED(vp, str) assert_vop_locked(vp, str)
403 #define ASSERT_VOP_UNLOCKED(vp, str) assert_vop_unlocked(vp, str);
405 #define ASSERT_VOP_ELOCKED(vp, str) \
407 struct vnode *_vp = (vp); \
409 if (_vp && IS_LOCKING_VFS(_vp) && \
410 VOP_ISLOCKED(_vp, curthread) != LK_EXCLUSIVE) \
411 panic("%s: %p is not exclusive locked but should be", \
415 #define ASSERT_VOP_ELOCKED_OTHER(vp, str) \
417 struct vnode *_vp = (vp); \
419 if (_vp && IS_LOCKING_VFS(_vp) && \
420 VOP_ISLOCKED(_vp, curthread) != LK_EXCLOTHER) \
421 panic("%s: %p is not exclusive locked by another proc", \
425 #define ASSERT_VOP_SLOCKED(vp, str) \
427 struct vnode *_vp = (vp); \
429 if (_vp && IS_LOCKING_VFS(_vp) && \
430 VOP_ISLOCKED(_vp, NULL) != LK_SHARED) \
431 panic("%s: %p is not locked shared but should be", \
435 void assert_vop_locked(struct vnode *vp, const char *str);
436 void assert_vop_unlocked(struct vnode *vp, const char *str);
440 #define ASSERT_VOP_LOCKED(vp, str)
441 #define ASSERT_VOP_UNLOCKED(vp, str)
443 #endif /* DEBUG_VFS_LOCKS */
446 * VOCALL calls an op given an ops vector. We break it out because BSD's
447 * vclean changes the ops vector and then wants to call ops with the old
451 typedef int (*vocall_func_t)(struct vop_generic_args *);
454 * This call executes the vops vector for the offset stored in the ap's
455 * descriptor of the passed vops rather then the one related to the
456 * ap's vop_ops structure. It is used to chain VOPS calls on behalf of
457 * filesystems from a VFS's context ONLY (that is, from a VFS's own vops
460 #define VOCALL(vops, ap) \
461 (*(vocall_func_t *)((char *)(vops)+((ap)->a_desc->vdesc_offset)))(ap)
463 #define VDESC(OP) (& __CONCAT(OP,_desc))
464 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
467 * VMIO support inline
470 extern int vmiodirenable;
473 vn_canvmio(struct vnode *vp)
475 if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
481 * Public vnode manipulation functions.
495 struct vop_bwrite_args;
497 extern int (*lease_check_hook) (struct vop_lease_args *);
499 void addaliasu (struct vnode *vp, udev_t nvp_udev);
500 int v_associate_rdev(struct vnode *vp, dev_t dev);
501 void v_release_rdev(struct vnode *vp);
502 int bdevvp (dev_t dev, struct vnode **vpp);
503 void cvtstat (struct stat *st, struct ostat *ost);
504 void cvtnstat (struct stat *sb, struct nstat *nsb);
505 int getnewvnode (enum vtagtype tag, struct mount *mp, struct vop_ops *ops,
506 struct vnode **vpp, int timo, int lkflags);
507 int lease_check (struct vop_lease_args *ap);
508 int spec_vnoperate (struct vop_generic_args *);
509 int speedup_syncer (void);
510 void vattr_null (struct vattr *vap);
511 int vcount (struct vnode *vp);
512 void vdrop (struct vnode *);
513 int vfinddev (dev_t dev, enum vtype type, struct vnode **vpp);
514 void vfs_add_vnodeops_sysinit (const void *);
515 void vfs_rm_vnodeops_sysinit (const void *);
516 void vfs_add_vnodeops(struct vop_ops **, struct vnodeopv_entry_desc *);
517 void vfs_rm_vnodeops(struct vop_ops **);
518 int vflush (struct mount *mp, int rootrefs, int flags);
519 int vmntvnodescan(struct mount *mp,
520 int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data),
521 int (*slowfunc)(struct mount *mp, struct vnode *vp, lwkt_tokref_t vlock,
522 void *data), void *data);
524 int vget (struct vnode *vp, lwkt_tokref_t vlock, int lockflag, struct thread *td);
525 void vgone (struct vnode *vp);
526 void vgonel (struct vnode *vp, lwkt_tokref_t vlock, struct thread *td);
527 void vhold (struct vnode *);
528 int vinvalbuf (struct vnode *vp, int save,
529 struct thread *td, int slpflag, int slptimeo);
530 int vtruncbuf (struct vnode *vp, struct thread *td,
531 off_t length, int blksize);
532 void vprint (char *label, struct vnode *vp);
533 int vrecycle (struct vnode *vp, struct lwkt_tokref *inter_lkp,
535 int vn_close (struct vnode *vp, int flags, struct thread *td);
536 int vn_isdisk (struct vnode *vp, int *errp);
537 int vn_lock (struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td);
539 int debug_vn_lock (struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td,
540 const char *filename, int line);
541 #define vn_lock(vp,vlock,flags,p) debug_vn_lock(vp,vlock,flags,p,__FILE__,__LINE__)
544 int vn_fullpath (struct proc *p, struct vnode *vn, char **retbuf, char **freebuf);
545 int vn_open (struct nameidata *ndp, int fmode, int cmode);
546 void vn_pollevent (struct vnode *vp, int events);
547 void vn_pollgone (struct vnode *vp);
548 int vn_pollrecord (struct vnode *vp, struct thread *td, int events);
549 int vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
550 int len, off_t offset, enum uio_seg segflg, int ioflg,
551 struct ucred *cred, int *aresid, struct thread *td);
552 int vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
553 int len, off_t offset, enum uio_seg segflg, int ioflg,
554 struct ucred *cred, int *aresid, struct thread *td);
555 int vn_stat (struct vnode *vp, struct stat *sb, struct thread *td);
556 dev_t vn_todev (struct vnode *vp);
557 int vfs_object_create (struct vnode *vp, struct thread *td);
558 void vfs_timestamp (struct timespec *);
559 int vn_writechk (struct vnode *vp);
560 int vop_stdbwrite (struct vop_bwrite_args *ap);
561 int vop_stdislocked (struct vop_islocked_args *ap);
562 int vop_stdlock (struct vop_lock_args *ap);
563 int vop_stdrlock (struct vop_lock_args *ap);
564 int vop_stdunlock (struct vop_unlock_args *ap);
565 int vop_nopoll (struct vop_poll_args *ap);
566 int vop_stdpathconf (struct vop_pathconf_args *ap);
567 int vop_stdpoll (struct vop_poll_args *ap);
568 int vop_stdrevoke (struct vop_revoke_args *ap);
569 int vop_eopnotsupp (struct vop_generic_args *ap);
570 int vop_ebadf (struct vop_generic_args *ap);
571 int vop_einval (struct vop_generic_args *ap);
572 int vop_enotty (struct vop_generic_args *ap);
573 int vop_defaultop (struct vop_generic_args *ap);
574 int vop_null (struct vop_generic_args *ap);
575 int vop_panic (struct vop_generic_args *ap);
576 int vop_stdcreatevobject (struct vop_createvobject_args *ap);
577 int vop_stddestroyvobject (struct vop_destroyvobject_args *ap);
578 int vop_stdgetvobject (struct vop_getvobject_args *ap);
580 void vput (struct vnode *vp);
581 void vrele (struct vnode *vp);
582 void vrele_noinactive (struct vnode *vp);
583 void vref (struct vnode *vp);
585 extern struct vop_ops *default_vnode_vops;
586 extern struct vop_ops *spec_vnode_vops;
587 extern struct vop_ops *dead_vnode_vops;
591 #endif /* !_SYS_VNODE_H_ */