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
8 * 1. Redistributions of source code must retain the above copyright
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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.
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18 * may be used to endorse or promote products derived from this software
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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 1.19 2004/08/13 17:51:10 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/vopops.h>
52 #include <machine/lock.h>
55 * The vnode is the focus of all file activity in UNIX. There is a
56 * unique vnode allocated for each active file, each current directory,
57 * each mounted-on file, text file, and the root.
61 * Vnode types. VNON means no type.
63 enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
67 * These are for the benefit of external programs only (e.g., pstat)
68 * and should NEVER be inspected by the kernel.
71 VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_PC, VT_LFS, VT_LOFS, VT_FDESC,
72 VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS,
73 VT_UNION, VT_MSDOSFS, VT_TFS, VT_VFS, VT_CODA, VT_NTFS,
74 VT_HPFS, VT_NWFS, VT_SMBFS, VT_UDF
78 * Each underlying filesystem allocates its own private area and hangs
79 * it from v_data. If non-null, this area is freed in getnewvnode().
81 TAILQ_HEAD(buflists, buf);
84 * Reading or writing any of these items requires holding the appropriate lock.
85 * v_freelist is locked by the global vnode_free_list token.
86 * v_mntvnodes is locked by the global mntvnodes token.
87 * v_flag, v_usecount, v_holdcount and v_writecount are
88 * locked by the v_interlock token.
89 * v_pollinfo is locked by the lock contained inside it.
91 * XXX note: v_opencount currently only used by specfs. It should be used
95 u_long v_flag; /* vnode flags (see below) */
96 int v_usecount; /* reference count of users */
97 int v_writecount; /* reference count of writers */
98 int v_holdcnt; /* page & buffer references */
99 int v_opencount; /* number of explicit opens */
100 u_long v_id; /* capability identifier */
101 struct mount *v_mount; /* ptr to vfs we are in */
102 struct vop_ops *v_vops;
103 TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */
104 TAILQ_ENTRY(vnode) v_nmntvnodes; /* vnodes for mount point */
105 struct buflists v_cleanblkhd; /* clean blocklist head */
106 struct buflists v_dirtyblkhd; /* dirty blocklist head */
107 LIST_ENTRY(vnode) v_synclist; /* vnodes with dirty buffers */
108 long v_numoutput; /* num of writes in progress */
109 enum vtype v_type; /* vnode type */
111 struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
112 struct socket *vu_socket; /* unix ipc (VSOCK) */
114 udev_t vu_udev; /* device number for attach */
115 struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
116 SLIST_ENTRY(vnode) vu_specnext;
118 struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */
120 struct nqlease *v_lease; /* Soft reference to lease */
121 daddr_t v_lastw; /* last write (write cluster) */
122 daddr_t v_cstart; /* start block of cluster */
123 daddr_t v_lasta; /* last allocation */
124 int v_clen; /* length of current cluster */
125 struct vm_object *v_object; /* Place to store VM object */
126 lwkt_token_t v_interlock; /* lock on usecount and flag */
127 struct lock *v_vnlock; /* used for non-locking fs's */
128 enum vtagtype v_tag; /* type of underlying data */
129 void *v_data; /* private data for fs */
130 struct namecache_list v_namecache; /* associated nc entries */
132 struct lwkt_token vpi_token; /* lock to protect below */
133 struct selinfo vpi_selinfo; /* identity of poller(s) */
134 short vpi_events; /* what they are looking for */
135 short vpi_revents; /* what has happened */
137 struct thread *v_vxthread; /* thread owning VXLOCK */
138 struct vmresident *v_resident; /* optional vmresident */
140 const char *filename; /* Source file doing locking */
141 int line; /* Line number doing locking */
144 #define v_mountedhere v_un.vu_mountedhere
145 #define v_socket v_un.vu_socket
146 #define v_udev v_un.vu_spec.vu_udev
147 #define v_rdev v_un.vu_spec.vu_specinfo
148 #define v_specnext v_un.vu_spec.vu_specnext
149 #define v_fifoinfo v_un.vu_fifoinfo
151 #define VN_POLLEVENT(vp, events) \
153 if ((vp)->v_pollinfo.vpi_events & (events)) \
154 vn_pollevent((vp), (events)); \
160 #define VROOT 0x00001 /* root of its file system */
161 #define VTEXT 0x00002 /* vnode is a pure text prototype */
162 #define VSYSTEM 0x00004 /* vnode being used by kernel */
163 #define VISTTY 0x00008 /* vnode represents a tty */
164 #define VXLOCK 0x00100 /* vnode is locked to change underlying type */
165 #define VXWANT 0x00200 /* process is waiting for vnode */
166 #define VBWAIT 0x00400 /* waiting for output to complete */
167 /* open for business 0x00800 */
168 /* open for business 0x01000 */
169 #define VOBJBUF 0x02000 /* Allocate buffers in VM object */
170 /* open for business 0x04000 */
171 #define VAGE 0x08000 /* Insert vnode at head of free list */
172 #define VOLOCK 0x10000 /* vnode is locked waiting for an object */
173 #define VOWANT 0x20000 /* a process is waiting for VOLOCK */
174 #define VDOOMED 0x40000 /* This vnode is being recycled */
175 #define VFREE 0x80000 /* This vnode is on the freelist */
176 #define VINFREE 0x100000 /* This vnode is in the midst of being freed */
177 #define VONWORKLST 0x200000 /* On syncer work-list */
178 #define VMOUNT 0x400000 /* Mount in progress */
179 #define VOBJDIRTY 0x800000 /* object might be dirty */
180 #define VPLACEMARKER 0x1000000 /* dummy vnode placemarker */
183 * Vnode attributes. A field value of VNOVAL represents a field whose value
184 * is unavailable (getattr) or which is not to be changed (setattr).
187 enum vtype va_type; /* vnode type (for create) */
188 u_short va_mode; /* files access mode and type */
189 short va_nlink; /* number of references to file */
190 uid_t va_uid; /* owner user id */
191 gid_t va_gid; /* owner group id */
192 udev_t va_fsid; /* file system id */
193 long va_fileid; /* file id */
194 u_quad_t va_size; /* file size in bytes */
195 long va_blocksize; /* blocksize preferred for i/o */
196 struct timespec va_atime; /* time of last access */
197 struct timespec va_mtime; /* time of last modification */
198 struct timespec va_ctime; /* time file changed */
199 u_long va_gen; /* generation number of file */
200 u_long va_flags; /* flags defined for file */
201 udev_t va_rdev; /* device the special file represents */
202 u_quad_t va_bytes; /* bytes of disk space held by file */
203 u_quad_t va_filerev; /* file modification number */
204 u_int va_vaflags; /* operations flags, see below */
205 long va_spare; /* remain quad aligned */
209 * Flags for va_vaflags.
211 #define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */
212 #define VA_EXCLUSIVE 0x02 /* exclusive create request */
215 * Flags for ioflag. (high 16 bits used to ask for read-ahead and
216 * help with write clustering)
218 #define IO_UNIT 0x0001 /* do I/O as atomic unit */
219 #define IO_APPEND 0x0002 /* append write to end */
220 #define IO_SYNC 0x0004 /* do I/O synchronously */
221 #define IO_NODELOCKED 0x0008 /* underlying node already locked */
222 #define IO_NDELAY 0x0010 /* FNDELAY flag set in file table */
223 #define IO_VMIO 0x0020 /* data already in VMIO space */
224 #define IO_INVAL 0x0040 /* invalidate after I/O */
225 #define IO_ASYNC 0x0080 /* bawrite rather then bdwrite */
226 #define IO_DIRECT 0x0100 /* attempt to bypass buffer cache */
227 #define IO_NOWDRAIN 0x0200 /* do not block on wdrain */
228 #define IO_CORE 0x0400 /* I/O is part of core dump */
230 #define IO_SEQMAX 0x7F /* seq heuristic max value */
231 #define IO_SEQSHIFT 16 /* seq heuristic in upper 16 bits */
234 * Modes. Some values same as Ixxx entries from inode.h for now.
236 #define VSUID 04000 /* set user id on execution */
237 #define VSGID 02000 /* set group id on execution */
238 #define VSVTX 01000 /* save swapped text even after use */
239 #define VREAD 00400 /* read, write, execute permissions */
244 * Token indicating no attribute value yet assigned.
249 * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
251 #define VLKTIMEOUT (hz / 20 + 1)
255 #ifdef MALLOC_DECLARE
256 MALLOC_DECLARE(M_VNODE);
260 * Convert between vnode types and inode formats (since POSIX.1
261 * defines mode word of stat structure in terms of inode formats).
263 extern enum vtype iftovt_tab[];
264 extern int vttoif_tab[];
265 #define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12])
266 #define VTTOIF(indx) (vttoif_tab[(int)(indx)])
267 #define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode))
270 * Flags to various vnode functions.
272 #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
273 #define FORCECLOSE 0x0002 /* vflush: force file closure */
274 #define WRITECLOSE 0x0004 /* vflush: only close writable files */
275 #define DOCLOSE 0x0008 /* vclean: close active files */
276 #define V_SAVE 0x0001 /* vinvalbuf: sync file first */
277 #define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */
280 #define VATTR_NULL(vap) vattr_null(vap)
282 #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
283 #endif /* DIAGNOSTIC */
285 #define NULLVP ((struct vnode *)NULL)
287 #define VNODEOP_SET(f) \
288 C_SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_add_vnodeops, &f); \
289 C_SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND, vfs_rm_vnodeops, &f);
294 extern struct vnode *rootvnode; /* root (i.e. "/") vnode */
295 extern int desiredvnodes; /* number of vnodes desired */
296 extern time_t syncdelay; /* max time to delay syncing data */
297 extern time_t filedelay; /* time to delay syncing files */
298 extern time_t dirdelay; /* time to delay syncing directories */
299 extern time_t metadelay; /* time to delay syncing metadata */
300 extern struct vm_zone *namei_zone;
301 extern int prtactive; /* nonzero to call vprint() */
302 extern struct vattr va_null; /* predefined null vattr structure */
303 extern int vfs_ioopt;
306 * Macro/function to check for client cache inconsistency w.r.t. leasing.
308 #define LEASE_READ 0x1 /* Check lease for readers */
309 #define LEASE_WRITE 0x2 /* Check lease for modifiers */
312 extern void (*lease_updatetime) (int deltat);
314 #define VI_LOCK(vlock, vp) lwkt_gettoken(vlock, (vp)->v_interlock)
315 #define VI_UNLOCK(vlock, vp) lwkt_reltoken(vlock)
320 * Mods for extensibility.
324 * Flags for vdesc_flags:
326 #define VDESC_MAX_VPS 16
327 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
328 #define VDESC_VP0_WILLRELE 0x0001
329 #define VDESC_VP1_WILLRELE 0x0002
330 #define VDESC_VP2_WILLRELE 0x0004
331 #define VDESC_VP3_WILLRELE 0x0008
332 #define VDESC_NOMAP_VPP 0x0100
333 #define VDESC_VPP_WILLRELE 0x0200
336 * VDESC_NO_OFFSET is used to identify the end of the offset list
337 * and in places where no such field exists.
339 #define VDESC_NO_OFFSET -1
342 * This structure describes the vnode operation taking place.
344 struct vnodeop_desc {
345 int vdesc_offset; /* offset in vector--first for speed */
346 char *vdesc_name; /* a readable name for debugging */
347 int vdesc_flags; /* VDESC_* flags */
350 * These ops are used by bypass routines to map and locate arguments.
351 * Creds and procs are not needed in bypass routines, but sometimes
352 * they are useful to (for example) transport layers.
353 * Nameidata is useful because it has a cred in it.
355 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */
356 int vdesc_vpp_offset; /* return vpp location */
357 int vdesc_cred_offset; /* cred location, if any */
358 int vdesc_proc_offset; /* proc location, if any */
359 int vdesc_componentname_offset; /* if any */
364 * A list of all the operation descs.
366 extern struct vnodeop_desc *vnodeop_descs[];
369 * Interlock for scanning list of vnodes attached to a mountpoint
371 extern struct lwkt_token mntvnode_token;
374 * This macro is very helpful in defining those offsets in the vdesc struct.
376 * This is stolen from X11R4. I ignored all the fancy stuff for
377 * Crays, so if you decide to port this to such a serious machine,
378 * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
380 #define VOPARG_OFFSET(p_type,field) \
381 ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
382 #define VOPARG_OFFSETOF(s_type,field) \
383 VOPARG_OFFSET(s_type*,field)
384 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
385 ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
389 * This structure is used to configure the new vnodeops vector. The entry
390 * descriptor describes a patricular VOP function while the operations
391 * vector descriptor recursively describes arrays of entry descriptors.
393 struct vnodeopv_entry_desc {
394 struct vnodeop_desc *opve_op;
395 int (*opve_func)(struct vop_generic_args *ap);
398 struct vnodeopv_desc {
399 struct vop_ops **opv_desc_vector; /* vect to allocate/fill*/
400 struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
403 struct vnodeopv_node {
404 TAILQ_ENTRY(vnodeopv_node) entry;
405 const struct vnodeopv_desc *vdesc;
408 #ifdef DEBUG_VFS_LOCKS
410 * Macros to aid in tracing VFS locking problems. Not totally
411 * reliable since if the process sleeps between changing the lock
412 * state and checking it with the assert, some other process could
413 * change the state. They are good enough for debugging a single
414 * filesystem using a single-threaded test. I find that 'cvs co src'
415 * is a pretty good test.
419 * [dfr] Kludge until I get around to fixing all the vfs locking.
421 #define IS_LOCKING_VFS(vp) ((vp)->v_tag == VT_UFS \
422 || (vp)->v_tag == VT_MFS \
423 || (vp)->v_tag == VT_NFS \
424 || (vp)->v_tag == VT_LFS \
425 || (vp)->v_tag == VT_ISOFS \
426 || (vp)->v_tag == VT_MSDOSFS)
428 #define ASSERT_VOP_LOCKED(vp, str) assert_vop_locked(vp, str)
429 #define ASSERT_VOP_UNLOCKED(vp, str) assert_vop_unlocked(vp, str);
431 #define ASSERT_VOP_ELOCKED(vp, str) \
433 struct vnode *_vp = (vp); \
435 if (_vp && IS_LOCKING_VFS(_vp) && \
436 VOP_ISLOCKED(_vp, curthread) != LK_EXCLUSIVE) \
437 panic("%s: %p is not exclusive locked but should be", \
441 #define ASSERT_VOP_ELOCKED_OTHER(vp, str) \
443 struct vnode *_vp = (vp); \
445 if (_vp && IS_LOCKING_VFS(_vp) && \
446 VOP_ISLOCKED(_vp, curthread) != LK_EXCLOTHER) \
447 panic("%s: %p is not exclusive locked by another proc", \
451 #define ASSERT_VOP_SLOCKED(vp, str) \
453 struct vnode *_vp = (vp); \
455 if (_vp && IS_LOCKING_VFS(_vp) && \
456 VOP_ISLOCKED(_vp, NULL) != LK_SHARED) \
457 panic("%s: %p is not locked shared but should be", \
461 void assert_vop_locked(struct vnode *vp, const char *str);
462 void assert_vop_unlocked(struct vnode *vp, const char *str);
466 #define ASSERT_VOP_LOCKED(vp, str)
467 #define ASSERT_VOP_UNLOCKED(vp, str)
469 #endif /* DEBUG_VFS_LOCKS */
472 * VOCALL calls an op given an ops vector. We break it out because BSD's
473 * vclean changes the ops vector and then wants to call ops with the old
477 typedef int (*vocall_func_t)(struct vop_generic_args *);
479 #define VOCALL(vops,off,ap) (*(vocall_func_t *)((char *)(vops)+(off)))(ap)
482 * This call works for vnodes in the kernel.
484 #define VCALL(VP,OFF,AP) VOCALL((VP)->v_vops,(OFF),(AP))
485 #define VDESC(OP) (& __CONCAT(OP,_desc))
486 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
489 * VMIO support inline
492 extern int vmiodirenable;
495 vn_canvmio(struct vnode *vp)
497 if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
503 * Public vnode manipulation functions.
517 struct vop_bwrite_args;
519 extern int (*lease_check_hook) (struct vop_lease_args *);
521 void addaliasu (struct vnode *vp, udev_t nvp_udev);
522 int v_associate_rdev(struct vnode *vp, dev_t dev);
523 void v_release_rdev(struct vnode *vp);
524 int bdevvp (dev_t dev, struct vnode **vpp);
525 void cvtstat (struct stat *st, struct ostat *ost);
526 void cvtnstat (struct stat *sb, struct nstat *nsb);
527 int getnewvnode (enum vtagtype tag,
528 struct mount *mp, struct vop_ops *vops, struct vnode **vpp);
529 int lease_check (struct vop_lease_args *ap);
530 int spec_vnoperate (struct vop_generic_args *);
531 int speedup_syncer (void);
532 void vattr_null (struct vattr *vap);
533 int vcount (struct vnode *vp);
534 void vdrop (struct vnode *);
535 int vfinddev (dev_t dev, enum vtype type, struct vnode **vpp);
536 void vfs_add_vnodeops (const void *);
537 void vfs_rm_vnodeops (const void *);
538 int vflush (struct mount *mp, int rootrefs, int flags);
539 int vmntvnodescan(struct mount *mp,
540 int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data),
541 int (*slowfunc)(struct mount *mp, struct vnode *vp, lwkt_tokref_t vlock,
542 void *data), void *data);
544 int vget (struct vnode *vp, lwkt_tokref_t vlock, int lockflag, struct thread *td);
545 void vgone (struct vnode *vp);
546 void vgonel (struct vnode *vp, lwkt_tokref_t vlock, struct thread *td);
547 void vhold (struct vnode *);
548 int vinvalbuf (struct vnode *vp, int save,
549 struct thread *td, int slpflag, int slptimeo);
550 int vtruncbuf (struct vnode *vp, struct thread *td,
551 off_t length, int blksize);
552 void vprint (char *label, struct vnode *vp);
553 int vrecycle (struct vnode *vp, struct lwkt_tokref *inter_lkp,
555 int vn_close (struct vnode *vp, int flags, struct thread *td);
556 int vn_isdisk (struct vnode *vp, int *errp);
557 int vn_lock (struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td);
559 int debug_vn_lock (struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td,
560 const char *filename, int line);
561 #define vn_lock(vp,vlock,flags,p) debug_vn_lock(vp,vlock,flags,p,__FILE__,__LINE__)
564 int vn_fullpath (struct proc *p, struct vnode *vn, char **retbuf, char **freebuf);
565 int vn_open (struct nameidata *ndp, int fmode, int cmode);
566 void vn_pollevent (struct vnode *vp, int events);
567 void vn_pollgone (struct vnode *vp);
568 int vn_pollrecord (struct vnode *vp, struct thread *td, int events);
569 int vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
570 int len, off_t offset, enum uio_seg segflg, int ioflg,
571 struct ucred *cred, int *aresid, struct thread *td);
572 int vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
573 int len, off_t offset, enum uio_seg segflg, int ioflg,
574 struct ucred *cred, int *aresid, struct thread *td);
575 int vn_stat (struct vnode *vp, struct stat *sb, struct thread *td);
576 dev_t vn_todev (struct vnode *vp);
577 int vfs_object_create (struct vnode *vp, struct thread *td);
578 void vfs_timestamp (struct timespec *);
579 int vn_writechk (struct vnode *vp);
580 int vop_stdbwrite (struct vop_bwrite_args *ap);
581 int vop_stdislocked (struct vop_islocked_args *ap);
582 int vop_stdlock (struct vop_lock_args *ap);
583 int vop_stdunlock (struct vop_unlock_args *ap);
584 int vop_noislocked (struct vop_islocked_args *ap);
585 int vop_nolock (struct vop_lock_args *ap);
586 int vop_nopoll (struct vop_poll_args *ap);
587 int vop_nounlock (struct vop_unlock_args *ap);
588 int vop_stdpathconf (struct vop_pathconf_args *ap);
589 int vop_stdpoll (struct vop_poll_args *ap);
590 int vop_stdrevoke (struct vop_revoke_args *ap);
591 int vop_sharedlock (struct vop_lock_args *ap);
592 int vop_eopnotsupp (struct vop_generic_args *ap);
593 int vop_ebadf (struct vop_generic_args *ap);
594 int vop_einval (struct vop_generic_args *ap);
595 int vop_enotty (struct vop_generic_args *ap);
596 int vop_defaultop (struct vop_generic_args *ap);
597 int vop_null (struct vop_generic_args *ap);
598 int vop_panic (struct vop_generic_args *ap);
599 int vop_stdcreatevobject (struct vop_createvobject_args *ap);
600 int vop_stddestroyvobject (struct vop_destroyvobject_args *ap);
601 int vop_stdgetvobject (struct vop_getvobject_args *ap);
603 void vput (struct vnode *vp);
604 void vrele (struct vnode *vp);
605 void vref (struct vnode *vp);
607 extern struct vop_ops *default_vnode_vops;
608 extern struct vop_ops *spec_vnode_vops;
612 #endif /* !_SYS_VNODE_H_ */