2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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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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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 1.8 2003/09/28 03:44:09 dillon Exp $
41 #include <sys/queue.h>
43 #include <sys/select.h>
46 #include <sys/namecache.h>
48 #include <machine/lock.h>
51 * The vnode is the focus of all file activity in UNIX. There is a
52 * unique vnode allocated for each active file, each current directory,
53 * each mounted-on file, text file, and the root.
57 * Vnode types. VNON means no type.
59 enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
63 * These are for the benefit of external programs only (e.g., pstat)
64 * and should NEVER be inspected by the kernel.
67 VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_PC, VT_LFS, VT_LOFS, VT_FDESC,
68 VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS,
69 VT_UNION, VT_MSDOSFS, VT_TFS, VT_VFS, VT_CODA, VT_NTFS,
70 VT_HPFS, VT_NWFS, VT_SMBFS
74 * Each underlying filesystem allocates its own private area and hangs
75 * it from v_data. If non-null, this area is freed in getnewvnode().
77 TAILQ_HEAD(buflists, buf);
79 typedef int vop_t (void *);
82 * Reading or writing any of these items requires holding the appropriate lock.
83 * v_freelist is locked by the global vnode_free_list token.
84 * v_mntvnodes is locked by the global mntvnodes token.
85 * v_flag, v_usecount, v_holdcount and v_writecount are
86 * locked by the v_interlock token.
87 * v_pollinfo is locked by the lock contained inside it.
90 u_long v_flag; /* vnode flags (see below) */
91 int v_usecount; /* reference count of users */
92 int v_writecount; /* reference count of writers */
93 int v_holdcnt; /* page & buffer references */
94 u_long v_id; /* capability identifier */
95 struct mount *v_mount; /* ptr to vfs we are in */
96 vop_t **v_op; /* vnode operations vector */
97 TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */
98 TAILQ_ENTRY(vnode) v_nmntvnodes; /* vnodes for mount point */
99 struct buflists v_cleanblkhd; /* clean blocklist head */
100 struct buflists v_dirtyblkhd; /* dirty blocklist head */
101 LIST_ENTRY(vnode) v_synclist; /* vnodes with dirty buffers */
102 long v_numoutput; /* num of writes in progress */
103 enum vtype v_type; /* vnode type */
105 struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
106 struct socket *vu_socket; /* unix ipc (VSOCK) */
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 struct lwkt_token v_interlock; /* lock on usecount and flag */
120 struct lock *v_vnlock; /* used for non-locking fs's */
121 enum vtagtype v_tag; /* type of underlying data */
122 void *v_data; /* private data for fs */
125 * YYY note: v_dd, v_ddid will become obsolete once the namecache
128 struct namecache_list v_namecache; /* associated nc entries */
129 struct vnode *v_dd; /* .. vnode */
130 u_long v_ddid; /* .. capability identifier */
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 proc *v_vxproc; /* proc owning VXLOCK */
139 const char *filename; /* Source file doing locking */
140 int line; /* Line number doing locking */
143 #define v_mountedhere v_un.vu_mountedhere
144 #define v_socket v_un.vu_socket
145 #define v_rdev v_un.vu_spec.vu_specinfo
146 #define v_specnext v_un.vu_spec.vu_specnext
147 #define v_fifoinfo v_un.vu_fifoinfo
149 #define VN_POLLEVENT(vp, events) \
151 if ((vp)->v_pollinfo.vpi_events & (events)) \
152 vn_pollevent((vp), (events)); \
158 #define VROOT 0x00001 /* root of its file system */
159 #define VTEXT 0x00002 /* vnode is a pure text prototype */
160 #define VSYSTEM 0x00004 /* vnode being used by kernel */
161 #define VISTTY 0x00008 /* vnode represents a tty */
162 #define VXLOCK 0x00100 /* vnode is locked to change underlying type */
163 #define VXWANT 0x00200 /* process is waiting for vnode */
164 #define VBWAIT 0x00400 /* waiting for output to complete */
165 /* open for business 0x00800 */
166 /* open for business 0x01000 */
167 #define VOBJBUF 0x02000 /* Allocate buffers in VM object */
168 /* open for business 0x04000 */
169 #define VAGE 0x08000 /* Insert vnode at head of free list */
170 #define VOLOCK 0x10000 /* vnode is locked waiting for an object */
171 #define VOWANT 0x20000 /* a process is waiting for VOLOCK */
172 #define VDOOMED 0x40000 /* This vnode is being recycled */
173 #define VFREE 0x80000 /* This vnode is on the freelist */
174 #define VONWORKLST 0x200000 /* On syncer work-list */
175 #define VMOUNT 0x400000 /* Mount in progress */
176 #define VOBJDIRTY 0x800000 /* object might be dirty */
179 * Vnode attributes. A field value of VNOVAL represents a field whose value
180 * is unavailable (getattr) or which is not to be changed (setattr).
183 enum vtype va_type; /* vnode type (for create) */
184 u_short va_mode; /* files access mode and type */
185 short va_nlink; /* number of references to file */
186 uid_t va_uid; /* owner user id */
187 gid_t va_gid; /* owner group id */
188 udev_t va_fsid; /* file system id */
189 long va_fileid; /* file id */
190 u_quad_t va_size; /* file size in bytes */
191 long va_blocksize; /* blocksize preferred for i/o */
192 struct timespec va_atime; /* time of last access */
193 struct timespec va_mtime; /* time of last modification */
194 struct timespec va_ctime; /* time file changed */
195 u_long va_gen; /* generation number of file */
196 u_long va_flags; /* flags defined for file */
197 udev_t va_rdev; /* device the special file represents */
198 u_quad_t va_bytes; /* bytes of disk space held by file */
199 u_quad_t va_filerev; /* file modification number */
200 u_int va_vaflags; /* operations flags, see below */
201 long va_spare; /* remain quad aligned */
205 * Flags for va_vaflags.
207 #define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */
208 #define VA_EXCLUSIVE 0x02 /* exclusive create request */
211 * Flags for ioflag. (high 16 bits used to ask for read-ahead and
212 * help with write clustering)
214 #define IO_UNIT 0x0001 /* do I/O as atomic unit */
215 #define IO_APPEND 0x0002 /* append write to end */
216 #define IO_SYNC 0x0004 /* do I/O synchronously */
217 #define IO_NODELOCKED 0x0008 /* underlying node already locked */
218 #define IO_NDELAY 0x0010 /* FNDELAY flag set in file table */
219 #define IO_VMIO 0x0020 /* data already in VMIO space */
220 #define IO_INVAL 0x0040 /* invalidate after I/O */
221 #define IO_ASYNC 0x0080 /* bawrite rather then bdwrite */
222 #define IO_DIRECT 0x0100 /* attempt to bypass buffer cache */
223 #define IO_NOWDRAIN 0x0200 /* do not block on wdrain */
224 #define IO_CORE 0x0400 /* I/O is part of core dump */
226 #define IO_SEQMAX 0x7F /* seq heuristic max value */
227 #define IO_SEQSHIFT 16 /* seq heuristic in upper 16 bits */
230 * Modes. Some values same as Ixxx entries from inode.h for now.
232 #define VSUID 04000 /* set user id on execution */
233 #define VSGID 02000 /* set group id on execution */
234 #define VSVTX 01000 /* save swapped text even after use */
235 #define VREAD 00400 /* read, write, execute permissions */
240 * Token indicating no attribute value yet assigned.
245 * LK_TIMELOCK timeout for vnode locks (used mainly by the pageout daemon)
247 #define VLKTIMEOUT (hz / 20 + 1)
251 #ifdef MALLOC_DECLARE
252 MALLOC_DECLARE(M_VNODE);
256 * Convert between vnode types and inode formats (since POSIX.1
257 * defines mode word of stat structure in terms of inode formats).
259 extern enum vtype iftovt_tab[];
260 extern int vttoif_tab[];
261 #define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12])
262 #define VTTOIF(indx) (vttoif_tab[(int)(indx)])
263 #define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode))
266 * Flags to various vnode functions.
268 #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
269 #define FORCECLOSE 0x0002 /* vflush: force file closure */
270 #define WRITECLOSE 0x0004 /* vflush: only close writable files */
271 #define DOCLOSE 0x0008 /* vclean: close active files */
272 #define V_SAVE 0x0001 /* vinvalbuf: sync file first */
273 #define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */
275 #define VREF(vp) vref(vp)
279 #define VATTR_NULL(vap) vattr_null(vap)
281 #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
282 #endif /* DIAGNOSTIC */
284 #define NULLVP ((struct vnode *)NULL)
286 #define VNODEOP_SET(f) \
287 C_SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_add_vnodeops, &f); \
288 C_SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND, vfs_rm_vnodeops, &f);
293 extern struct vnode *rootvnode; /* root (i.e. "/") vnode */
294 extern int desiredvnodes; /* number of vnodes desired */
295 extern time_t syncdelay; /* max time to delay syncing data */
296 extern time_t filedelay; /* time to delay syncing files */
297 extern time_t dirdelay; /* time to delay syncing directories */
298 extern time_t metadelay; /* time to delay syncing metadata */
299 extern struct vm_zone *namei_zone;
300 extern int prtactive; /* nonzero to call vprint() */
301 extern struct vattr va_null; /* predefined null vattr structure */
302 extern int vfs_ioopt;
305 * Macro/function to check for client cache inconsistency w.r.t. leasing.
307 #define LEASE_READ 0x1 /* Check lease for readers */
308 #define LEASE_WRITE 0x2 /* Check lease for modifiers */
311 extern void (*lease_updatetime) (int deltat);
313 #define VSHOULDFREE(vp) \
314 (!((vp)->v_flag & (VFREE|VDOOMED)) && \
315 !(vp)->v_holdcnt && !(vp)->v_usecount && \
316 (!(vp)->v_object || \
317 !((vp)->v_object->ref_count || (vp)->v_object->resident_page_count)))
319 #define VMIGHTFREE(vp) \
320 (((vp)->v_flag & (VFREE|VDOOMED|VXLOCK)) == 0 && \
321 cache_leaf_test(vp) == 0 && (vp)->v_usecount == 0)
323 #define VSHOULDBUSY(vp) \
324 (((vp)->v_flag & VFREE) && \
325 ((vp)->v_holdcnt || (vp)->v_usecount))
327 #define VI_LOCK(vp) lwkt_gettoken(&(vp)->v_interlock)
328 #define VI_UNLOCK(vp) lwkt_reltoken(&(vp)->v_interlock)
334 * Mods for extensibility.
338 * Flags for vdesc_flags:
340 #define VDESC_MAX_VPS 16
341 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
342 #define VDESC_VP0_WILLRELE 0x0001
343 #define VDESC_VP1_WILLRELE 0x0002
344 #define VDESC_VP2_WILLRELE 0x0004
345 #define VDESC_VP3_WILLRELE 0x0008
346 #define VDESC_NOMAP_VPP 0x0100
347 #define VDESC_VPP_WILLRELE 0x0200
350 * VDESC_NO_OFFSET is used to identify the end of the offset list
351 * and in places where no such field exists.
353 #define VDESC_NO_OFFSET -1
356 * This structure describes the vnode operation taking place.
358 struct vnodeop_desc {
359 int vdesc_offset; /* offset in vector--first for speed */
360 char *vdesc_name; /* a readable name for debugging */
361 int vdesc_flags; /* VDESC_* flags */
364 * These ops are used by bypass routines to map and locate arguments.
365 * Creds and procs are not needed in bypass routines, but sometimes
366 * they are useful to (for example) transport layers.
367 * Nameidata is useful because it has a cred in it.
369 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */
370 int vdesc_vpp_offset; /* return vpp location */
371 int vdesc_cred_offset; /* cred location, if any */
372 int vdesc_proc_offset; /* proc location, if any */
373 int vdesc_componentname_offset; /* if any */
375 * Finally, we've got a list of private data (about each operation)
376 * for each transport layer. (Support to manage this list is not
379 caddr_t *vdesc_transports;
384 * A list of all the operation descs.
386 extern struct vnodeop_desc *vnodeop_descs[];
389 * Interlock for scanning list of vnodes attached to a mountpoint
391 extern struct lwkt_token mntvnode_token;
394 * This macro is very helpful in defining those offsets in the vdesc struct.
396 * This is stolen from X11R4. I ignored all the fancy stuff for
397 * Crays, so if you decide to port this to such a serious machine,
398 * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
400 #define VOPARG_OFFSET(p_type,field) \
401 ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
402 #define VOPARG_OFFSETOF(s_type,field) \
403 VOPARG_OFFSET(s_type*,field)
404 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
405 ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
409 * This structure is used to configure the new vnodeops vector.
411 struct vnodeopv_entry_desc {
412 struct vnodeop_desc *opve_op; /* which operation this is */
413 vop_t *opve_impl; /* code implementing this operation */
415 struct vnodeopv_desc {
416 /* ptr to the ptr to the vector where op should go */
417 vop_t ***opv_desc_vector_p;
418 struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
422 * A generic structure.
423 * This can be used by bypass routines to identify generic arguments.
425 struct vop_generic_args {
426 struct vnodeop_desc *a_desc;
427 /* other random data follows, presumably */
431 #ifdef DEBUG_VFS_LOCKS
433 * Macros to aid in tracing VFS locking problems. Not totally
434 * reliable since if the process sleeps between changing the lock
435 * state and checking it with the assert, some other process could
436 * change the state. They are good enough for debugging a single
437 * filesystem using a single-threaded test. I find that 'cvs co src'
438 * is a pretty good test.
442 * [dfr] Kludge until I get around to fixing all the vfs locking.
444 #define IS_LOCKING_VFS(vp) ((vp)->v_tag == VT_UFS \
445 || (vp)->v_tag == VT_MFS \
446 || (vp)->v_tag == VT_NFS \
447 || (vp)->v_tag == VT_LFS \
448 || (vp)->v_tag == VT_ISOFS \
449 || (vp)->v_tag == VT_MSDOSFS)
451 #define ASSERT_VOP_LOCKED(vp, str) \
453 struct vnode *_vp = (vp); \
455 if (_vp && IS_LOCKING_VFS(_vp) && !VOP_ISLOCKED(_vp, NULL)) \
456 panic("%s: %p is not locked but should be", str, _vp); \
459 #define ASSERT_VOP_UNLOCKED(vp, str) \
461 struct vnode *_vp = (vp); \
464 if (_vp && IS_LOCKING_VFS(_vp)) { \
465 lockstate = VOP_ISLOCKED(_vp, curthread); \
466 if (lockstate == LK_EXCLUSIVE) \
467 panic("%s: %p is locked but should not be", \
472 #define ASSERT_VOP_ELOCKED(vp, str) \
474 struct vnode *_vp = (vp); \
476 if (_vp && IS_LOCKING_VFS(_vp) && \
477 VOP_ISLOCKED(_vp, curthread) != LK_EXCLUSIVE) \
478 panic("%s: %p is not exclusive locked but should be", \
482 #define ASSERT_VOP_ELOCKED_OTHER(vp, str) \
484 struct vnode *_vp = (vp); \
486 if (_vp && IS_LOCKING_VFS(_vp) && \
487 VOP_ISLOCKED(_vp, curthread) != LK_EXCLOTHER) \
488 panic("%s: %p is not exclusive locked by another proc", \
492 #define ASSERT_VOP_SLOCKED(vp, str) \
494 struct vnode *_vp = (vp); \
496 if (_vp && IS_LOCKING_VFS(_vp) && \
497 VOP_ISLOCKED(_vp, NULL) != LK_SHARED) \
498 panic("%s: %p is not locked shared but should be", \
504 #define ASSERT_VOP_LOCKED(vp, str)
505 #define ASSERT_VOP_UNLOCKED(vp, str)
510 * VOCALL calls an op given an ops vector. We break it out because BSD's
511 * vclean changes the ops vector and then wants to call ops with the old
514 #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
517 * This call works for vnodes in the kernel.
519 #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
520 #define VDESC(OP) (& __CONCAT(OP,_desc))
521 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
524 * VMIO support inline
527 extern int vmiodirenable;
530 vn_canvmio(struct vnode *vp)
532 if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
538 * Finally, include the default set of vnode operations.
540 #include "vnode_if.h"
543 * Public vnode manipulation functions.
557 struct vop_bwrite_args;
559 extern int (*lease_check_hook) (struct vop_lease_args *);
561 void addalias (struct vnode *vp, dev_t nvp_rdev);
562 void addaliasu (struct vnode *vp, udev_t nvp_rdev);
563 int bdevvp (dev_t dev, struct vnode **vpp);
564 void cvtstat (struct stat *st, struct ostat *ost);
565 void cvtnstat (struct stat *sb, struct nstat *nsb);
566 int getnewvnode (enum vtagtype tag,
567 struct mount *mp, vop_t **vops, struct vnode **vpp);
568 int lease_check (struct vop_lease_args *ap);
569 int spec_vnoperate (struct vop_generic_args *);
570 int speedup_syncer (void);
571 void vattr_null (struct vattr *vap);
572 int vcount (struct vnode *vp);
573 void vdrop (struct vnode *);
574 int vfinddev (dev_t dev, enum vtype type, struct vnode **vpp);
575 void vfs_add_vnodeops (const void *);
576 void vfs_rm_vnodeops (const void *);
577 int vflush (struct mount *mp, int rootrefs, int flags);
578 int vget (struct vnode *vp, int lockflag, struct thread *td);
579 void vgone (struct vnode *vp);
580 void vgonel (struct vnode *vp, struct thread *td);
581 void vhold (struct vnode *);
582 int vinvalbuf (struct vnode *vp, int save,
583 struct thread *td, int slpflag, int slptimeo);
584 int vtruncbuf (struct vnode *vp, struct thread *td,
585 off_t length, int blksize);
586 void vprint (char *label, struct vnode *vp);
587 int vrecycle (struct vnode *vp, struct lwkt_token *inter_lkp,
589 int vn_close (struct vnode *vp, int flags, struct thread *td);
590 int vn_isdisk (struct vnode *vp, int *errp);
591 int vn_lock (struct vnode *vp, int flags, struct thread *td);
593 int debug_vn_lock (struct vnode *vp, int flags, struct thread *td,
594 const char *filename, int line);
595 #define vn_lock(vp,flags,p) debug_vn_lock(vp,flags,p,__FILE__,__LINE__)
597 int vn_open (struct nameidata *ndp, int fmode, int cmode);
598 void vn_pollevent (struct vnode *vp, int events);
599 void vn_pollgone (struct vnode *vp);
600 int vn_pollrecord (struct vnode *vp, struct thread *td, int events);
601 int vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
602 int len, off_t offset, enum uio_seg segflg, int ioflg,
603 struct ucred *cred, int *aresid, struct thread *td);
604 int vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
605 int len, off_t offset, enum uio_seg segflg, int ioflg,
606 struct ucred *cred, int *aresid, struct thread *td);
607 int vn_stat (struct vnode *vp, struct stat *sb, struct thread *td);
608 dev_t vn_todev (struct vnode *vp);
609 int vfs_object_create (struct vnode *vp, struct thread *td);
610 void vfs_timestamp (struct timespec *);
611 int vn_writechk (struct vnode *vp);
612 int vop_stdbwrite (struct vop_bwrite_args *ap);
613 int vop_stdislocked (struct vop_islocked_args *);
614 int vop_stdlock (struct vop_lock_args *);
615 int vop_stdunlock (struct vop_unlock_args *);
616 int vop_noislocked (struct vop_islocked_args *);
617 int vop_nolock (struct vop_lock_args *);
618 int vop_nopoll (struct vop_poll_args *);
619 int vop_nounlock (struct vop_unlock_args *);
620 int vop_stdpathconf (struct vop_pathconf_args *);
621 int vop_stdpoll (struct vop_poll_args *);
622 int vop_revoke (struct vop_revoke_args *);
623 int vop_sharedlock (struct vop_lock_args *);
624 int vop_eopnotsupp (struct vop_generic_args *ap);
625 int vop_ebadf (struct vop_generic_args *ap);
626 int vop_einval (struct vop_generic_args *ap);
627 int vop_enotty (struct vop_generic_args *ap);
628 int vop_defaultop (struct vop_generic_args *ap);
629 int vop_null (struct vop_generic_args *ap);
630 int vop_panic (struct vop_generic_args *ap);
631 int vop_stdcreatevobject (struct vop_createvobject_args *ap);
632 int vop_stddestroyvobject (struct vop_destroyvobject_args *ap);
633 int vop_stdgetvobject (struct vop_getvobject_args *ap);
635 void vfree (struct vnode *vp);
636 void vput (struct vnode *vp);
637 void vrele (struct vnode *vp);
638 void vref (struct vnode *vp);
639 void vbusy (struct vnode *vp);
641 extern vop_t **default_vnodeop_p;
642 extern vop_t **spec_vnodeop_p;
646 #endif /* !_SYS_VNODE_H_ */