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 1.15 2004/04/24 04:32:03 drhodus Exp $
41 #include <sys/queue.h>
43 #include <sys/select.h>
46 #include <sys/namecache.h>
48 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
49 #include <sys/thread.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);
83 typedef int vop_t (void *);
86 * Reading or writing any of these items requires holding the appropriate lock.
87 * v_freelist is locked by the global vnode_free_list token.
88 * v_mntvnodes is locked by the global mntvnodes token.
89 * v_flag, v_usecount, v_holdcount and v_writecount are
90 * locked by the v_interlock token.
91 * v_pollinfo is locked by the lock contained inside it.
94 u_long v_flag; /* vnode flags (see below) */
95 int v_usecount; /* reference count of users */
96 int v_writecount; /* reference count of writers */
97 int v_holdcnt; /* page & buffer references */
98 u_long v_id; /* capability identifier */
99 struct mount *v_mount; /* ptr to vfs we are in */
100 vop_t **v_op; /* vnode operations vector */
101 TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */
102 TAILQ_ENTRY(vnode) v_nmntvnodes; /* vnodes for mount point */
103 struct buflists v_cleanblkhd; /* clean blocklist head */
104 struct buflists v_dirtyblkhd; /* dirty blocklist head */
105 LIST_ENTRY(vnode) v_synclist; /* vnodes with dirty buffers */
106 long v_numoutput; /* num of writes in progress */
107 enum vtype v_type; /* vnode type */
109 struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
110 struct socket *vu_socket; /* unix ipc (VSOCK) */
112 struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
113 SLIST_ENTRY(vnode) vu_specnext;
115 struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */
117 struct nqlease *v_lease; /* Soft reference to lease */
118 daddr_t v_lastw; /* last write (write cluster) */
119 daddr_t v_cstart; /* start block of cluster */
120 daddr_t v_lasta; /* last allocation */
121 int v_clen; /* length of current cluster */
122 struct vm_object *v_object; /* Place to store VM object */
123 lwkt_token_t v_interlock; /* lock on usecount and flag */
124 struct lock *v_vnlock; /* used for non-locking fs's */
125 enum vtagtype v_tag; /* type of underlying data */
126 void *v_data; /* private data for fs */
127 struct namecache_list v_namecache; /* associated nc entries */
129 struct lwkt_token vpi_token; /* lock to protect below */
130 struct selinfo vpi_selinfo; /* identity of poller(s) */
131 short vpi_events; /* what they are looking for */
132 short vpi_revents; /* what has happened */
134 struct thread *v_vxthread; /* thread owning VXLOCK */
135 struct vmresident *v_resident; /* optional vmresident */
137 const char *filename; /* Source file doing locking */
138 int line; /* Line number doing locking */
141 #define v_mountedhere v_un.vu_mountedhere
142 #define v_socket v_un.vu_socket
143 #define v_rdev v_un.vu_spec.vu_specinfo
144 #define v_specnext v_un.vu_spec.vu_specnext
145 #define v_fifoinfo v_un.vu_fifoinfo
147 #define VN_POLLEVENT(vp, events) \
149 if ((vp)->v_pollinfo.vpi_events & (events)) \
150 vn_pollevent((vp), (events)); \
156 #define VROOT 0x00001 /* root of its file system */
157 #define VTEXT 0x00002 /* vnode is a pure text prototype */
158 #define VSYSTEM 0x00004 /* vnode being used by kernel */
159 #define VISTTY 0x00008 /* vnode represents a tty */
160 #define VXLOCK 0x00100 /* vnode is locked to change underlying type */
161 #define VXWANT 0x00200 /* process is waiting for vnode */
162 #define VBWAIT 0x00400 /* waiting for output to complete */
163 /* open for business 0x00800 */
164 /* open for business 0x01000 */
165 #define VOBJBUF 0x02000 /* Allocate buffers in VM object */
166 /* open for business 0x04000 */
167 #define VAGE 0x08000 /* Insert vnode at head of free list */
168 #define VOLOCK 0x10000 /* vnode is locked waiting for an object */
169 #define VOWANT 0x20000 /* a process is waiting for VOLOCK */
170 #define VDOOMED 0x40000 /* This vnode is being recycled */
171 #define VFREE 0x80000 /* This vnode is on the freelist */
172 #define VINFREE 0x100000 /* This vnode is in the midst of being freed */
173 #define VONWORKLST 0x200000 /* On syncer work-list */
174 #define VMOUNT 0x400000 /* Mount in progress */
175 #define VOBJDIRTY 0x800000 /* object might be dirty */
176 #define VPLACEMARKER 0x1000000 /* dummy vnode placemarker */
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 */
276 #define VATTR_NULL(vap) vattr_null(vap)
278 #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
279 #endif /* DIAGNOSTIC */
281 #define NULLVP ((struct vnode *)NULL)
283 #define VNODEOP_SET(f) \
284 C_SYSINIT(f##init, SI_SUB_VFS, SI_ORDER_SECOND, vfs_add_vnodeops, &f); \
285 C_SYSUNINIT(f##uninit, SI_SUB_VFS, SI_ORDER_SECOND, vfs_rm_vnodeops, &f);
290 extern struct vnode *rootvnode; /* root (i.e. "/") vnode */
291 extern int desiredvnodes; /* number of vnodes desired */
292 extern time_t syncdelay; /* max time to delay syncing data */
293 extern time_t filedelay; /* time to delay syncing files */
294 extern time_t dirdelay; /* time to delay syncing directories */
295 extern time_t metadelay; /* time to delay syncing metadata */
296 extern struct vm_zone *namei_zone;
297 extern int prtactive; /* nonzero to call vprint() */
298 extern struct vattr va_null; /* predefined null vattr structure */
299 extern int vfs_ioopt;
302 * Macro/function to check for client cache inconsistency w.r.t. leasing.
304 #define LEASE_READ 0x1 /* Check lease for readers */
305 #define LEASE_WRITE 0x2 /* Check lease for modifiers */
308 extern void (*lease_updatetime) (int deltat);
310 #define VI_LOCK(vlock, vp) lwkt_gettoken(vlock, (vp)->v_interlock)
311 #define VI_UNLOCK(vlock, vp) lwkt_reltoken(vlock)
316 * Mods for extensibility.
320 * Flags for vdesc_flags:
322 #define VDESC_MAX_VPS 16
323 /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
324 #define VDESC_VP0_WILLRELE 0x0001
325 #define VDESC_VP1_WILLRELE 0x0002
326 #define VDESC_VP2_WILLRELE 0x0004
327 #define VDESC_VP3_WILLRELE 0x0008
328 #define VDESC_NOMAP_VPP 0x0100
329 #define VDESC_VPP_WILLRELE 0x0200
332 * VDESC_NO_OFFSET is used to identify the end of the offset list
333 * and in places where no such field exists.
335 #define VDESC_NO_OFFSET -1
338 * This structure describes the vnode operation taking place.
340 struct vnodeop_desc {
341 int vdesc_offset; /* offset in vector--first for speed */
342 char *vdesc_name; /* a readable name for debugging */
343 int vdesc_flags; /* VDESC_* flags */
346 * These ops are used by bypass routines to map and locate arguments.
347 * Creds and procs are not needed in bypass routines, but sometimes
348 * they are useful to (for example) transport layers.
349 * Nameidata is useful because it has a cred in it.
351 int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */
352 int vdesc_vpp_offset; /* return vpp location */
353 int vdesc_cred_offset; /* cred location, if any */
354 int vdesc_proc_offset; /* proc location, if any */
355 int vdesc_componentname_offset; /* if any */
357 * Finally, we've got a list of private data (about each operation)
358 * for each transport layer. (Support to manage this list is not
361 caddr_t *vdesc_transports;
366 * A list of all the operation descs.
368 extern struct vnodeop_desc *vnodeop_descs[];
371 * Interlock for scanning list of vnodes attached to a mountpoint
373 extern struct lwkt_token mntvnode_token;
376 * This macro is very helpful in defining those offsets in the vdesc struct.
378 * This is stolen from X11R4. I ignored all the fancy stuff for
379 * Crays, so if you decide to port this to such a serious machine,
380 * you might want to consult Intrinsic.h's XtOffset{,Of,To}.
382 #define VOPARG_OFFSET(p_type,field) \
383 ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
384 #define VOPARG_OFFSETOF(s_type,field) \
385 VOPARG_OFFSET(s_type*,field)
386 #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
387 ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
391 * This structure is used to configure the new vnodeops vector.
393 struct vnodeopv_entry_desc {
394 struct vnodeop_desc *opve_op; /* which operation this is */
395 vop_t *opve_impl; /* code implementing this operation */
397 struct vnodeopv_desc {
398 /* ptr to the ptr to the vector where op should go */
399 vop_t ***opv_desc_vector_p;
400 struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
404 * A generic structure.
405 * This can be used by bypass routines to identify generic arguments.
407 struct vop_generic_args {
408 struct vnodeop_desc *a_desc;
409 /* other random data follows, presumably */
413 #ifdef DEBUG_VFS_LOCKS
415 * Macros to aid in tracing VFS locking problems. Not totally
416 * reliable since if the process sleeps between changing the lock
417 * state and checking it with the assert, some other process could
418 * change the state. They are good enough for debugging a single
419 * filesystem using a single-threaded test. I find that 'cvs co src'
420 * is a pretty good test.
424 * [dfr] Kludge until I get around to fixing all the vfs locking.
426 #define IS_LOCKING_VFS(vp) ((vp)->v_tag == VT_UFS \
427 || (vp)->v_tag == VT_MFS \
428 || (vp)->v_tag == VT_NFS \
429 || (vp)->v_tag == VT_LFS \
430 || (vp)->v_tag == VT_ISOFS \
431 || (vp)->v_tag == VT_MSDOSFS)
433 #define ASSERT_VOP_LOCKED(vp, str) assert_vop_locked(vp, str)
434 #define ASSERT_VOP_UNLOCKED(vp, str) assert_vop_unlocked(vp, str);
436 #define ASSERT_VOP_ELOCKED(vp, str) \
438 struct vnode *_vp = (vp); \
440 if (_vp && IS_LOCKING_VFS(_vp) && \
441 VOP_ISLOCKED(_vp, curthread) != LK_EXCLUSIVE) \
442 panic("%s: %p is not exclusive locked but should be", \
446 #define ASSERT_VOP_ELOCKED_OTHER(vp, str) \
448 struct vnode *_vp = (vp); \
450 if (_vp && IS_LOCKING_VFS(_vp) && \
451 VOP_ISLOCKED(_vp, curthread) != LK_EXCLOTHER) \
452 panic("%s: %p is not exclusive locked by another proc", \
456 #define ASSERT_VOP_SLOCKED(vp, str) \
458 struct vnode *_vp = (vp); \
460 if (_vp && IS_LOCKING_VFS(_vp) && \
461 VOP_ISLOCKED(_vp, NULL) != LK_SHARED) \
462 panic("%s: %p is not locked shared but should be", \
466 void assert_vop_locked(struct vnode *vp, const char *str);
467 void assert_vop_unlocked(struct vnode *vp, const char *str);
471 #define ASSERT_VOP_LOCKED(vp, str)
472 #define ASSERT_VOP_UNLOCKED(vp, str)
474 #endif /* DEBUG_VFS_LOCKS */
477 * VOCALL calls an op given an ops vector. We break it out because BSD's
478 * vclean changes the ops vector and then wants to call ops with the old
481 #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
484 * This call works for vnodes in the kernel.
486 #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
487 #define VDESC(OP) (& __CONCAT(OP,_desc))
488 #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
491 * VMIO support inline
494 extern int vmiodirenable;
497 vn_canvmio(struct vnode *vp)
499 if (vp && (vp->v_type == VREG || (vmiodirenable && vp->v_type == VDIR)))
505 * Finally, include the default set of vnode operations.
507 #include "vnode_if.h"
510 * Public vnode manipulation functions.
524 struct vop_bwrite_args;
526 extern int (*lease_check_hook) (struct vop_lease_args *);
528 void addalias (struct vnode *vp, dev_t nvp_rdev);
529 void addaliasu (struct vnode *vp, udev_t nvp_rdev);
530 int bdevvp (dev_t dev, struct vnode **vpp);
531 void cvtstat (struct stat *st, struct ostat *ost);
532 void cvtnstat (struct stat *sb, struct nstat *nsb);
533 int getnewvnode (enum vtagtype tag,
534 struct mount *mp, vop_t **vops, struct vnode **vpp);
535 int lease_check (struct vop_lease_args *ap);
536 int spec_vnoperate (struct vop_generic_args *);
537 int speedup_syncer (void);
538 void vattr_null (struct vattr *vap);
539 int vcount (struct vnode *vp);
540 void vdrop (struct vnode *);
541 int vfinddev (dev_t dev, enum vtype type, struct vnode **vpp);
542 void vfs_add_vnodeops (const void *);
543 void vfs_rm_vnodeops (const void *);
544 int vflush (struct mount *mp, int rootrefs, int flags);
545 int vmntvnodescan(struct mount *mp,
546 int (*fastfunc)(struct mount *mp, struct vnode *vp, void *data),
547 int (*slowfunc)(struct mount *mp, struct vnode *vp, lwkt_tokref_t vlock,
548 void *data), void *data);
550 int vget (struct vnode *vp, lwkt_tokref_t vlock, int lockflag, struct thread *td);
551 void vgone (struct vnode *vp);
552 void vgonel (struct vnode *vp, lwkt_tokref_t vlock, struct thread *td);
553 void vhold (struct vnode *);
554 int vinvalbuf (struct vnode *vp, int save,
555 struct thread *td, int slpflag, int slptimeo);
556 int vtruncbuf (struct vnode *vp, struct thread *td,
557 off_t length, int blksize);
558 void vprint (char *label, struct vnode *vp);
559 int vrecycle (struct vnode *vp, struct lwkt_tokref *inter_lkp,
561 int vn_close (struct vnode *vp, int flags, struct thread *td);
562 int vn_isdisk (struct vnode *vp, int *errp);
563 int vn_lock (struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td);
565 int debug_vn_lock (struct vnode *vp, lwkt_tokref_t vlock, int flags, struct thread *td,
566 const char *filename, int line);
567 #define vn_lock(vp,vlock,flags,p) debug_vn_lock(vp,vlock,flags,p,__FILE__,__LINE__)
569 int vn_open (struct nameidata *ndp, int fmode, int cmode);
570 void vn_pollevent (struct vnode *vp, int events);
571 void vn_pollgone (struct vnode *vp);
572 int vn_pollrecord (struct vnode *vp, struct thread *td, int events);
573 int vn_rdwr (enum uio_rw rw, struct vnode *vp, caddr_t base,
574 int len, off_t offset, enum uio_seg segflg, int ioflg,
575 struct ucred *cred, int *aresid, struct thread *td);
576 int vn_rdwr_inchunks (enum uio_rw rw, struct vnode *vp, caddr_t base,
577 int len, off_t offset, enum uio_seg segflg, int ioflg,
578 struct ucred *cred, int *aresid, struct thread *td);
579 int vn_stat (struct vnode *vp, struct stat *sb, struct thread *td);
580 dev_t vn_todev (struct vnode *vp);
581 int vfs_object_create (struct vnode *vp, struct thread *td);
582 void vfs_timestamp (struct timespec *);
583 int vn_writechk (struct vnode *vp);
584 int vop_stdbwrite (struct vop_bwrite_args *ap);
585 int vop_stdislocked (struct vop_islocked_args *);
586 int vop_stdlock (struct vop_lock_args *);
587 int vop_stdunlock (struct vop_unlock_args *);
588 int vop_noislocked (struct vop_islocked_args *);
589 int vop_nolock (struct vop_lock_args *);
590 int vop_nopoll (struct vop_poll_args *);
591 int vop_nounlock (struct vop_unlock_args *);
592 int vop_stdpathconf (struct vop_pathconf_args *);
593 int vop_stdpoll (struct vop_poll_args *);
594 int vop_revoke (struct vop_revoke_args *);
595 int vop_sharedlock (struct vop_lock_args *);
596 int vop_eopnotsupp (struct vop_generic_args *ap);
597 int vop_ebadf (struct vop_generic_args *ap);
598 int vop_einval (struct vop_generic_args *ap);
599 int vop_enotty (struct vop_generic_args *ap);
600 int vop_defaultop (struct vop_generic_args *ap);
601 int vop_null (struct vop_generic_args *ap);
602 int vop_panic (struct vop_generic_args *ap);
603 int vop_stdcreatevobject (struct vop_createvobject_args *ap);
604 int vop_stddestroyvobject (struct vop_destroyvobject_args *ap);
605 int vop_stdgetvobject (struct vop_getvobject_args *ap);
607 void vput (struct vnode *vp);
608 void vrele (struct vnode *vp);
609 void vref (struct vnode *vp);
611 extern vop_t **default_vnodeop_p;
612 extern vop_t **spec_vnodeop_p;
616 #endif /* !_SYS_VNODE_H_ */