xref: /titanic_41/usr/src/uts/common/sys/vnode.h (revision e49962a00eea60555f3c78ebf58a9a641590802c)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
27 /*	  All Rights Reserved  	*/
28 
29 /*
30  * University Copyright- Copyright (c) 1982, 1986, 1988
31  * The Regents of the University of California
32  * All Rights Reserved
33  *
34  * University Acknowledgment- Portions of this document are derived from
35  * software developed by the University of California, Berkeley, and its
36  * contributors.
37  */
38 
39 #ifndef _SYS_VNODE_H
40 #define	_SYS_VNODE_H
41 
42 #pragma ident	"%Z%%M%	%I%	%E% SMI"
43 
44 #include <sys/types.h>
45 #include <sys/t_lock.h>
46 #include <sys/rwstlock.h>
47 #include <sys/time_impl.h>
48 #include <sys/cred.h>
49 #include <sys/uio.h>
50 #include <sys/resource.h>
51 #include <vm/seg_enum.h>
52 #include <sys/kstat.h>
53 #include <sys/kmem.h>
54 #include <sys/avl.h>
55 #ifdef	_KERNEL
56 #include <sys/buf.h>
57 #endif	/* _KERNEL */
58 
59 #ifdef	__cplusplus
60 extern "C" {
61 #endif
62 
63 
64 typedef int (*fs_generic_func_p) ();
65 
66 /*
67  * File systems use arrays of fs_operation_def structures to form
68  * name/value pairs of operations.  These arrays get passed to:
69  *
70  * 	- vn_make_ops() to create vnodeops
71  * 	- vfs_makefsops()/vfs_setfsops() to create vfsops.
72  */
73 typedef struct fs_operation_def {
74 	char *name;			/* name of operation (NULL at end) */
75 	fs_generic_func_p func;		/* function implementing operation */
76 } fs_operation_def_t;
77 
78 /*
79  * The operation registration mechanism uses two master tables of operations:
80  * one for vnode operations (vn_ops_table[]) and one for vfs operations
81  * (vfs_ops_table[]).  These tables are arrays of fs_operation_trans_def
82  * structures.  They contain all of the information necessary for the system
83  * to populate an operations structure (e.g., vnodeops, vfsops).
84  *
85  * File systems call registration routines (vfs_setfsops(), vfs_makefsops(),
86  * and vn_make_ops()) and pass in their operations specification tables
87  * (arrays of fs_operation_def structures).  These routines use the master
88  * table(s) of operations to build a vnodeops or vfsops structure.
89  */
90 typedef struct fs_operation_trans_def {
91 	char *name;			/* name of operation (NULL at end) */
92 	int offset;			/* byte offset within ops vector */
93 	fs_generic_func_p defaultFunc;	/* default function */
94 	fs_generic_func_p errorFunc; 	/* error function */
95 } fs_operation_trans_def_t;
96 
97 
98 /*
99  * Statistics for all vnode operations.
100  * All operations record number of ops (since boot/mount/zero'ed).
101  * Certain I/O operations (read, write, readdir) also record number
102  * of bytes transferred.
103  * This appears in two places in the system: one is embedded in each
104  * vfs_t.  There is also an array of vopstats_t structures allocated
105  * on a per-fstype basis.
106  */
107 
108 #define	VOPSTATS_STR	"vopstats_"	/* Initial string for vopstat kstats */
109 
110 typedef struct vopstats {
111 	kstat_named_t	nopen;		/* VOP_OPEN */
112 	kstat_named_t	nclose;		/* VOP_CLOSE */
113 	kstat_named_t	nread;		/* VOP_READ */
114 	kstat_named_t	read_bytes;
115 	kstat_named_t	nwrite;		/* VOP_WRITE */
116 	kstat_named_t	write_bytes;
117 	kstat_named_t	nioctl;		/* VOP_IOCTL */
118 	kstat_named_t	nsetfl;		/* VOP_SETFL */
119 	kstat_named_t	ngetattr;	/* VOP_GETATTR */
120 	kstat_named_t	nsetattr;	/* VOP_SETATTR */
121 	kstat_named_t	naccess;	/* VOP_ACCESS */
122 	kstat_named_t	nlookup;	/* VOP_LOOKUP */
123 	kstat_named_t	ncreate;	/* VOP_CREATE */
124 	kstat_named_t	nremove;	/* VOP_REMOVE */
125 	kstat_named_t	nlink;		/* VOP_LINK */
126 	kstat_named_t	nrename;	/* VOP_RENAME */
127 	kstat_named_t	nmkdir;		/* VOP_MKDIR */
128 	kstat_named_t	nrmdir;		/* VOP_RMDIR */
129 	kstat_named_t	nreaddir;	/* VOP_READDIR */
130 	kstat_named_t	readdir_bytes;
131 	kstat_named_t	nsymlink;	/* VOP_SYMLINK */
132 	kstat_named_t	nreadlink;	/* VOP_READLINK */
133 	kstat_named_t	nfsync;		/* VOP_FSYNC */
134 	kstat_named_t	ninactive;	/* VOP_INACTIVE */
135 	kstat_named_t	nfid;		/* VOP_FID */
136 	kstat_named_t	nrwlock;	/* VOP_RWLOCK */
137 	kstat_named_t	nrwunlock;	/* VOP_RWUNLOCK */
138 	kstat_named_t	nseek;		/* VOP_SEEK */
139 	kstat_named_t	ncmp;		/* VOP_CMP */
140 	kstat_named_t	nfrlock;	/* VOP_FRLOCK */
141 	kstat_named_t	nspace;		/* VOP_SPACE */
142 	kstat_named_t	nrealvp;	/* VOP_REALVP */
143 	kstat_named_t	ngetpage;	/* VOP_GETPAGE */
144 	kstat_named_t	nputpage;	/* VOP_PUTPAGE */
145 	kstat_named_t	nmap;		/* VOP_MAP */
146 	kstat_named_t	naddmap;	/* VOP_ADDMAP */
147 	kstat_named_t	ndelmap;	/* VOP_DELMAP */
148 	kstat_named_t	npoll;		/* VOP_POLL */
149 	kstat_named_t	ndump;		/* VOP_DUMP */
150 	kstat_named_t	npathconf;	/* VOP_PATHCONF */
151 	kstat_named_t	npageio;	/* VOP_PAGEIO */
152 	kstat_named_t	ndumpctl;	/* VOP_DUMPCTL */
153 	kstat_named_t	ndispose;	/* VOP_DISPOSE */
154 	kstat_named_t	nsetsecattr;	/* VOP_SETSECATTR */
155 	kstat_named_t	ngetsecattr;	/* VOP_GETSECATTR */
156 	kstat_named_t	nshrlock;	/* VOP_SHRLOCK */
157 	kstat_named_t	nvnevent;	/* VOP_VNEVENT */
158 } vopstats_t;
159 
160 /*
161  * The vnode is the focus of all file activity in UNIX.
162  * A vnode is allocated for each active file, each current
163  * directory, each mounted-on file, and the root.
164  *
165  * Each vnode is usually associated with a file-system-specific node (for
166  * UFS, this is the in-memory inode).  Generally, a vnode and an fs-node
167  * should be created and destroyed together as a pair.
168  *
169  * If a vnode is reused for a new file, it should be reinitialized by calling
170  * either vn_reinit() or vn_recycle().
171  *
172  * vn_reinit() resets the entire vnode as if it was returned by vn_alloc().
173  * The caller is responsible for setting up the entire vnode after calling
174  * vn_reinit().  This is important when using kmem caching where the vnode is
175  * allocated by a constructor, for instance.
176  *
177  * vn_recycle() is used when the file system keeps some state around in both
178  * the vnode and the associated FS-node.  In UFS, for example, the inode of
179  * a deleted file can be reused immediately.  The v_data, v_vfsp, v_op, etc.
180  * remains the same but certain fields related to the previous instance need
181  * to be reset.  In particular:
182  *	v_femhead
183  *	v_path
184  *	v_rdcnt, v_wrcnt
185  *	v_mmap_read, v_mmap_write
186  */
187 
188 /*
189  * vnode types.  VNON means no type.  These values are unrelated to
190  * values in on-disk inodes.
191  */
192 typedef enum vtype {
193 	VNON	= 0,
194 	VREG	= 1,
195 	VDIR	= 2,
196 	VBLK	= 3,
197 	VCHR	= 4,
198 	VLNK	= 5,
199 	VFIFO	= 6,
200 	VDOOR	= 7,
201 	VPROC	= 8,
202 	VSOCK	= 9,
203 	VPORT	= 10,
204 	VBAD	= 11
205 } vtype_t;
206 
207 /*
208  * Many of the fields in the vnode are read-only once they are initialized
209  * at vnode creation time.  Other fields are protected by locks.
210  *
211  * IMPORTANT: vnodes should be created ONLY by calls to vn_alloc().  They
212  * may not be embedded into the file-system specific node (inode).  The
213  * size of vnodes may change.
214  *
215  * The v_lock protects:
216  *   v_flag
217  *   v_stream
218  *   v_count
219  *   v_shrlocks
220  *   v_path
221  *
222  * A special lock (implemented by vn_vfswlock in vnode.c) protects:
223  *   v_vfsmountedhere
224  *
225  * The global flock_lock mutex (in flock.c) protects:
226  *   v_filocks
227  *
228  * IMPORTANT NOTE:
229  *
230  *   The following vnode fields are considered public and may safely be
231  *   accessed by file systems or other consumers:
232  *
233  *     v_lock
234  *     v_flag
235  *     v_count
236  *     v_data
237  *     v_vfsp
238  *     v_stream
239  *     v_type
240  *     v_rdev
241  *
242  * ALL OTHER FIELDS SHOULD BE ACCESSED ONLY BY THE OWNER OF THAT FIELD.
243  * In particular, file systems should not access other fields; they may
244  * change or even be removed.  The functionality which was once provided
245  * by these fields is available through vn_* functions.
246  */
247 
248 struct fem_head;	/* from fem.h */
249 
250 typedef struct vnode {
251 	kmutex_t	v_lock;		/* protects vnode fields */
252 	uint_t		v_flag;		/* vnode flags (see below) */
253 	uint_t		v_count;	/* reference count */
254 	void		*v_data;	/* private data for fs */
255 	struct vfs	*v_vfsp;	/* ptr to containing VFS */
256 	struct stdata	*v_stream;	/* associated stream */
257 	enum vtype	v_type;		/* vnode type */
258 	dev_t		v_rdev;		/* device (VCHR, VBLK) */
259 
260 	/* PRIVATE FIELDS BELOW - DO NOT USE */
261 
262 	struct vfs	*v_vfsmountedhere; /* ptr to vfs mounted here */
263 	struct vnodeops	*v_op;		/* vnode operations */
264 	struct page	*v_pages;	/* vnode pages list */
265 	pgcnt_t		v_npages;	/* # pages on this vnode */
266 	pgcnt_t		v_msnpages;	/* # pages charged to v_mset */
267 	struct page	*v_scanfront;	/* scanner front hand */
268 	struct page	*v_scanback;	/* scanner back hand */
269 	struct filock	*v_filocks;	/* ptr to filock list */
270 	struct shrlocklist *v_shrlocks;	/* ptr to shrlock list */
271 	krwlock_t	v_nbllock;	/* sync for NBMAND locks */
272 	kcondvar_t	v_cv;		/* synchronize locking */
273 	void		*v_locality;	/* hook for locality info */
274 	struct fem_head	*v_femhead;	/* fs monitoring */
275 	char		*v_path;	/* cached path */
276 	uint_t		v_rdcnt;	/* open for read count  (VREG only) */
277 	uint_t		v_wrcnt;	/* open for write count (VREG only) */
278 	u_longlong_t	v_mmap_read;	/* mmap read count */
279 	u_longlong_t	v_mmap_write;	/* mmap write count */
280 	void		*v_mpssdata;	/* info for large page mappings */
281 	hrtime_t	v_scantime;	/* last time this vnode was scanned */
282 	ushort_t	v_mset;		/* memory set ID */
283 	uint_t		v_msflags;	/* memory set flags */
284 	struct vnode	*v_msnext;	/* list of vnodes on an mset */
285 	struct vnode	*v_msprev;	/* list of vnodes on an mset */
286 	krwlock_t	v_mslock;	/* protects v_mset */
287 } vnode_t;
288 
289 #define	IS_DEVVP(vp)	\
290 	((vp)->v_type == VCHR || (vp)->v_type == VBLK || (vp)->v_type == VFIFO)
291 
292 /*
293  * vnode flags.
294  */
295 #define	VROOT		0x01	/* root of its file system */
296 #define	VNOCACHE	0x02	/* don't keep cache pages on vnode */
297 #define	VNOMAP		0x04	/* file cannot be mapped/faulted */
298 #define	VDUP		0x08	/* file should be dup'ed rather then opened */
299 #define	VNOSWAP		0x10	/* file cannot be used as virtual swap device */
300 #define	VNOMOUNT	0x20	/* file cannot be covered by mount */
301 #define	VISSWAP		0x40	/* vnode is being used for swap */
302 #define	VSWAPLIKE	0x80	/* vnode acts like swap (but may not be) */
303 
304 #define	IS_SWAPVP(vp)	(((vp)->v_flag & (VISSWAP | VSWAPLIKE)) != 0)
305 
306 typedef struct vn_vfslocks_entry {
307 	rwstlock_t ve_lock;
308 	void *ve_vpvfs;
309 	struct vn_vfslocks_entry *ve_next;
310 	uint32_t ve_refcnt;
311 	char pad[64 - sizeof (rwstlock_t) - 2 * sizeof (void *) - \
312 	    sizeof (uint32_t)];
313 } vn_vfslocks_entry_t;
314 
315 /*
316  * The following two flags are used to lock the v_vfsmountedhere field
317  */
318 #define	VVFSLOCK	0x100
319 #define	VVFSWAIT	0x200
320 
321 /*
322  * Used to serialize VM operations on a vnode
323  */
324 #define	VVMLOCK		0x400
325 
326 /*
327  * Tell vn_open() not to fail a directory open for writing but
328  * to go ahead and call VOP_OPEN() to let the filesystem check.
329  */
330 #define	VDIROPEN	0x800
331 
332 /*
333  * Flag to let the VM system know that this file is most likely a binary
334  * or shared library since it has been mmap()ed EXEC at some time.
335  */
336 #define	VVMEXEC		0x1000
337 
338 #define	VPXFS		0x2000  /* clustering: global fs proxy vnode */
339 
340 #define	IS_PXFSVP(vp)	((vp)->v_flag & VPXFS)
341 
342 #define	V_XATTRDIR	0x4000	/* attribute unnamed directory */
343 
344 #define	V_LOCALITY	0x8000	/* whether locality aware */
345 
346 /*
347  * Flag that indicates the VM should maintain the v_pages list with all modified
348  * pages on one end and unmodified pages at the other. This makes finding dirty
349  * pages to write back to disk much faster at the expense of taking a minor
350  * fault on the first store instruction which touches a writable page.
351  */
352 #define	VMODSORT	(0x10000)
353 #define	IS_VMODSORT(vp) \
354 	(pvn_vmodsort_supported != 0 && ((vp)->v_flag  & VMODSORT) != 0)
355 
356 #define	VISSWAPFS	0x20000	/* vnode is being used for swapfs */
357 #define	IS_SWAPFSVP(vp)	(((vp)->v_flag & VISSWAPFS) != 0)
358 
359 /*
360  * Vnode attributes.  A bit-mask is supplied as part of the
361  * structure to indicate the attributes the caller wants to
362  * set (setattr) or extract (getattr).
363  */
364 
365 /*
366  * Note that va_nodeid and va_nblocks are 64bit data type.
367  * We support large files over NFSV3. With Solaris client and
368  * Server that generates 64bit ino's and sizes these fields
369  * will overflow if they are 32 bit sizes.
370  */
371 
372 typedef struct vattr {
373 	uint_t		va_mask;	/* bit-mask of attributes */
374 	vtype_t		va_type;	/* vnode type (for create) */
375 	mode_t		va_mode;	/* file access mode */
376 	uid_t		va_uid;		/* owner user id */
377 	gid_t		va_gid;		/* owner group id */
378 	dev_t		va_fsid;	/* file system id (dev for now) */
379 	u_longlong_t	va_nodeid;	/* node id */
380 	nlink_t		va_nlink;	/* number of references to file */
381 	u_offset_t	va_size;	/* file size in bytes */
382 	timestruc_t	va_atime;	/* time of last access */
383 	timestruc_t	va_mtime;	/* time of last modification */
384 	timestruc_t	va_ctime;	/* time of last status change */
385 	dev_t		va_rdev;	/* device the file represents */
386 	uint_t		va_blksize;	/* fundamental block size */
387 	u_longlong_t	va_nblocks;	/* # of blocks allocated */
388 	uint_t		va_seq;		/* sequence number */
389 } vattr_t;
390 
391 #ifdef _SYSCALL32
392 /*
393  * For bigtypes time_t changed to 64 bit on the 64-bit kernel.
394  * Define an old version for user/kernel interface
395  */
396 
397 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
398 #pragma pack(4)
399 #endif
400 
401 typedef struct vattr32 {
402 	uint32_t	va_mask;	/* bit-mask of attributes */
403 	vtype_t		va_type;	/* vnode type (for create) */
404 	mode32_t	va_mode;	/* file access mode */
405 	uid32_t		va_uid;		/* owner user id */
406 	gid32_t		va_gid;		/* owner group id */
407 	dev32_t		va_fsid;	/* file system id (dev for now) */
408 	u_longlong_t	va_nodeid;	/* node id */
409 	nlink_t		va_nlink;	/* number of references to file */
410 	u_offset_t	va_size;	/* file size in bytes */
411 	timestruc32_t	va_atime;	/* time of last access */
412 	timestruc32_t	va_mtime;	/* time of last modification */
413 	timestruc32_t	va_ctime;	/* time of last status change */
414 	dev32_t		va_rdev;	/* device the file represents */
415 	uint32_t	va_blksize;	/* fundamental block size */
416 	u_longlong_t	va_nblocks;	/* # of blocks allocated */
417 	uint32_t	va_seq;		/* sequence number */
418 } vattr32_t;
419 
420 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
421 #pragma pack()
422 #endif
423 
424 #else  /* not _SYSCALL32 */
425 #define	vattr32		vattr
426 typedef vattr_t		vattr32_t;
427 #endif /* _SYSCALL32 */
428 
429 /*
430  * Attributes of interest to the caller of setattr or getattr.
431  */
432 #define	AT_TYPE		0x0001
433 #define	AT_MODE		0x0002
434 #define	AT_UID		0x0004
435 #define	AT_GID		0x0008
436 #define	AT_FSID		0x0010
437 #define	AT_NODEID	0x0020
438 #define	AT_NLINK	0x0040
439 #define	AT_SIZE		0x0080
440 #define	AT_ATIME	0x0100
441 #define	AT_MTIME	0x0200
442 #define	AT_CTIME	0x0400
443 #define	AT_RDEV		0x0800
444 #define	AT_BLKSIZE	0x1000
445 #define	AT_NBLOCKS	0x2000
446 /*			0x4000 */	/* unused */
447 #define	AT_SEQ		0x8000
448 
449 #define	AT_ALL		(AT_TYPE|AT_MODE|AT_UID|AT_GID|AT_FSID|AT_NODEID|\
450 			AT_NLINK|AT_SIZE|AT_ATIME|AT_MTIME|AT_CTIME|\
451 			AT_RDEV|AT_BLKSIZE|AT_NBLOCKS|AT_SEQ)
452 
453 #define	AT_STAT		(AT_MODE|AT_UID|AT_GID|AT_FSID|AT_NODEID|AT_NLINK|\
454 			AT_SIZE|AT_ATIME|AT_MTIME|AT_CTIME|AT_RDEV|AT_TYPE)
455 
456 #define	AT_TIMES	(AT_ATIME|AT_MTIME|AT_CTIME)
457 
458 #define	AT_NOSET	(AT_NLINK|AT_RDEV|AT_FSID|AT_NODEID|AT_TYPE|\
459 			AT_BLKSIZE|AT_NBLOCKS|AT_SEQ)
460 
461 /*
462  *  Modes.  Some values same as S_xxx entries from stat.h for convenience.
463  */
464 #define	VSUID		04000		/* set user id on execution */
465 #define	VSGID		02000		/* set group id on execution */
466 #define	VSVTX		01000		/* save swapped text even after use */
467 
468 /*
469  * Permissions.
470  */
471 #define	VREAD		00400
472 #define	VWRITE		00200
473 #define	VEXEC		00100
474 
475 #define	MODEMASK	07777		/* mode bits plus permission bits */
476 #define	PERMMASK	00777		/* permission bits */
477 
478 /*
479  * Check whether mandatory file locking is enabled.
480  */
481 
482 #define	MANDMODE(mode)		(((mode) & (VSGID|(VEXEC>>3))) == VSGID)
483 #define	MANDLOCK(vp, mode)	((vp)->v_type == VREG && MANDMODE(mode))
484 
485 /*
486  * Flags for vnode operations.
487  */
488 enum rm		{ RMFILE, RMDIRECTORY };	/* rm or rmdir (remove) */
489 enum symfollow	{ NO_FOLLOW, FOLLOW };		/* follow symlinks (or not) */
490 enum vcexcl	{ NONEXCL, EXCL };		/* (non)excl create */
491 enum create	{ CRCREAT, CRMKNOD, CRMKDIR };	/* reason for create */
492 
493 typedef enum rm		rm_t;
494 typedef enum symfollow	symfollow_t;
495 typedef enum vcexcl	vcexcl_t;
496 typedef enum create	create_t;
497 
498 /* Vnode Events - Used by VOP_VNEVENT */
499 typedef enum vnevent	{
500 	VE_SUPPORT	= 0,	/* Query */
501 	VE_RENAME_SRC	= 1,	/* Rename, with vnode as source */
502 	VE_RENAME_DEST	= 2,	/* Rename, with vnode as target/destination */
503 	VE_REMOVE	= 3,	/* Remove of vnode's name */
504 	VE_RMDIR	= 4	/* Remove of directory vnode's name */
505 } vnevent_t;
506 
507 /*
508  * Values for checking vnode open and map counts
509  */
510 enum v_mode { V_READ, V_WRITE, V_RDORWR, V_RDANDWR };
511 
512 typedef enum v_mode v_mode_t;
513 
514 #define	V_TRUE	1
515 #define	V_FALSE	0
516 
517 /*
518  * Structure used on VOP_GETSECATTR and VOP_SETSECATTR operations
519  */
520 
521 typedef struct vsecattr {
522 	uint_t		vsa_mask;	/* See below */
523 	int		vsa_aclcnt;	/* ACL entry count */
524 	void		*vsa_aclentp;	/* pointer to ACL entries */
525 	int		vsa_dfaclcnt;	/* default ACL entry count */
526 	void		*vsa_dfaclentp;	/* pointer to default ACL entries */
527 } vsecattr_t;
528 
529 /* vsa_mask values */
530 #define	VSA_ACL		0x0001
531 #define	VSA_ACLCNT	0x0002
532 #define	VSA_DFACL	0x0004
533 #define	VSA_DFACLCNT	0x0008
534 #define	VSA_ACE		0x0010
535 #define	VSA_ACECNT	0x0020
536 
537 /*
538  * Structure used by various vnode operations to determine
539  * the context (pid, host, identity) of a caller.
540  *
541  * The cc_caller_id is used to identify one or more callers who invoke
542  * operations, possibly on behalf of others.  For example, the NFS
543  * server could have it's own cc_caller_id which can be detected by
544  * vnode/vfs operations or (FEM) monitors on those operations.  New
545  * caller IDs are generated by fs_new_caller_id().
546  */
547 typedef struct caller_context {
548 	pid_t		cc_pid;		/* Process ID of the caller */
549 	int		cc_sysid;	/* System ID, used for remote calls */
550 	u_longlong_t	cc_caller_id;	/* Identifier for (set of) caller(s) */
551 } caller_context_t;
552 
553 /*
554  * Structure tags for function prototypes, defined elsewhere.
555  */
556 struct pathname;
557 struct fid;
558 struct flock64;
559 struct flk_callback;
560 struct shrlock;
561 struct page;
562 struct seg;
563 struct as;
564 struct pollhead;
565 
566 /*
567  * Operations on vnodes.  Note: File systems should never operate directly
568  * on a 'vnodeops' structure -- it WILL change in future releases!  They
569  * should use vn_make_ops() to create the structure.
570  */
571 typedef struct vnodeops {
572 	const char *vnop_name;
573 	int	(*vop_open)(vnode_t **, int, cred_t *);
574 	int	(*vop_close)(vnode_t *, int, int, offset_t, cred_t *);
575 	int	(*vop_read)(vnode_t *, uio_t *, int, cred_t *,
576 				caller_context_t *);
577 	int	(*vop_write)(vnode_t *, uio_t *, int, cred_t *,
578 				caller_context_t *);
579 	int	(*vop_ioctl)(vnode_t *, int, intptr_t, int, cred_t *, int *);
580 	int	(*vop_setfl)(vnode_t *, int, int, cred_t *);
581 	int	(*vop_getattr)(vnode_t *, vattr_t *, int, cred_t *);
582 	int	(*vop_setattr)(vnode_t *, vattr_t *, int, cred_t *,
583 				caller_context_t *);
584 	int	(*vop_access)(vnode_t *, int, int, cred_t *);
585 	int	(*vop_lookup)(vnode_t *, char *, vnode_t **, struct pathname *,
586 				int, vnode_t *, cred_t *);
587 	int	(*vop_create)(vnode_t *, char *, vattr_t *, vcexcl_t, int,
588 				vnode_t **, cred_t *, int);
589 	int	(*vop_remove)(vnode_t *, char *, cred_t *);
590 	int	(*vop_link)(vnode_t *, vnode_t *, char *, cred_t *);
591 	int	(*vop_rename)(vnode_t *, char *, vnode_t *, char *, cred_t *);
592 	int	(*vop_mkdir)(vnode_t *, char *, vattr_t *, vnode_t **,
593 				cred_t *);
594 	int	(*vop_rmdir)(vnode_t *, char *, vnode_t *, cred_t *);
595 	int	(*vop_readdir)(vnode_t *, uio_t *, cred_t *, int *);
596 	int	(*vop_symlink)(vnode_t *, char *, vattr_t *, char *, cred_t *);
597 	int	(*vop_readlink)(vnode_t *, uio_t *, cred_t *);
598 	int	(*vop_fsync)(vnode_t *, int, cred_t *);
599 	void	(*vop_inactive)(vnode_t *, cred_t *);
600 	int	(*vop_fid)(vnode_t *, struct fid *);
601 	int	(*vop_rwlock)(vnode_t *, int, caller_context_t *);
602 	void	(*vop_rwunlock)(vnode_t *, int, caller_context_t *);
603 	int	(*vop_seek)(vnode_t *, offset_t, offset_t *);
604 	int	(*vop_cmp)(vnode_t *, vnode_t *);
605 	int	(*vop_frlock)(vnode_t *, int, struct flock64 *, int, offset_t,
606 				struct flk_callback *, cred_t *);
607 	int	(*vop_space)(vnode_t *, int, struct flock64 *, int, offset_t,
608 				cred_t *, caller_context_t *);
609 	int	(*vop_realvp)(vnode_t *, vnode_t **);
610 	int	(*vop_getpage)(vnode_t *, offset_t, size_t, uint_t *,
611 				struct page **, size_t, struct seg *,
612 				caddr_t, enum seg_rw, cred_t *);
613 	int	(*vop_putpage)(vnode_t *, offset_t, size_t, int, cred_t *);
614 	int	(*vop_map)(vnode_t *, offset_t, struct as *, caddr_t *, size_t,
615 				uchar_t, uchar_t, uint_t, cred_t *);
616 	int	(*vop_addmap)(vnode_t *, offset_t, struct as *, caddr_t, size_t,
617 				uchar_t, uchar_t, uint_t, cred_t *);
618 	int	(*vop_delmap)(vnode_t *, offset_t, struct as *, caddr_t, size_t,
619 				uint_t, uint_t, uint_t, cred_t *);
620 	int	(*vop_poll)(vnode_t *, short, int, short *, struct pollhead **);
621 	int	(*vop_dump)(vnode_t *, caddr_t, int, int);
622 	int	(*vop_pathconf)(vnode_t *, int, ulong_t *, cred_t *);
623 	int	(*vop_pageio)(vnode_t *, struct page *, u_offset_t, size_t,
624 				int, cred_t *);
625 	int	(*vop_dumpctl)(vnode_t *, int, int *);
626 	void	(*vop_dispose)(vnode_t *, struct page *, int, int, cred_t *);
627 	int	(*vop_setsecattr)(vnode_t *, vsecattr_t *, int, cred_t *);
628 	int	(*vop_getsecattr)(vnode_t *, vsecattr_t *, int, cred_t *);
629 	int	(*vop_shrlock)(vnode_t *, int, struct shrlock *, int, cred_t *);
630 	int	(*vop_vnevent)(vnode_t *, vnevent_t);
631 } vnodeops_t;
632 
633 #ifdef	_KERNEL
634 
635 extern int	fop_open(vnode_t **, int, cred_t *);
636 extern int	fop_close(vnode_t *, int, int, offset_t, cred_t *);
637 extern int	fop_read(vnode_t *, uio_t *, int, cred_t *, caller_context_t *);
638 extern int	fop_write(vnode_t *, uio_t *, int, cred_t *,
639 				caller_context_t *);
640 extern int	fop_ioctl(vnode_t *, int, intptr_t, int, cred_t *, int *);
641 extern int	fop_setfl(vnode_t *, int, int, cred_t *);
642 extern int	fop_getattr(vnode_t *, vattr_t *, int, cred_t *);
643 extern int	fop_setattr(vnode_t *, vattr_t *, int, cred_t *,
644 				caller_context_t *);
645 extern int	fop_access(vnode_t *, int, int, cred_t *);
646 extern int	fop_lookup(vnode_t *, char *, vnode_t **, struct pathname *,
647 				int, vnode_t *, cred_t *);
648 extern int	fop_create(vnode_t *, char *, vattr_t *, vcexcl_t, int,
649 				vnode_t **, cred_t *, int);
650 extern int	fop_remove(vnode_t *vp, char *, cred_t *);
651 extern int	fop_link(vnode_t *, vnode_t *, char *, cred_t *);
652 extern int	fop_rename(vnode_t *, char *, vnode_t *, char *, cred_t *);
653 extern int	fop_mkdir(vnode_t *, char *, vattr_t *, vnode_t **, cred_t *);
654 extern int	fop_rmdir(vnode_t *, char *, vnode_t *, cred_t *);
655 extern int	fop_readdir(vnode_t *, uio_t *, cred_t *, int *);
656 extern int	fop_symlink(vnode_t *, char *, vattr_t *, char *, cred_t *);
657 extern int	fop_readlink(vnode_t *, uio_t *, cred_t *);
658 extern int	fop_fsync(vnode_t *, int, cred_t *);
659 extern void	fop_inactive(vnode_t *, cred_t *);
660 extern int	fop_fid(vnode_t *, struct fid *);
661 extern int	fop_rwlock(vnode_t *, int, caller_context_t *);
662 extern void	fop_rwunlock(vnode_t *, int, caller_context_t *);
663 extern int	fop_seek(vnode_t *, offset_t, offset_t *);
664 extern int	fop_cmp(vnode_t *, vnode_t *);
665 extern int	fop_frlock(vnode_t *, int, struct flock64 *, int, offset_t,
666 				struct flk_callback *, cred_t *);
667 extern int	fop_space(vnode_t *, int, struct flock64 *, int, offset_t,
668 				cred_t *, caller_context_t *);
669 extern int	fop_realvp(vnode_t *, vnode_t **);
670 extern int	fop_getpage(vnode_t *, offset_t, size_t, uint_t *,
671 				struct page **, size_t, struct seg *,
672 				caddr_t, enum seg_rw, cred_t *);
673 extern int	fop_putpage(vnode_t *, offset_t, size_t, int, cred_t *);
674 extern int	fop_map(vnode_t *, offset_t, struct as *, caddr_t *, size_t,
675 				uchar_t, uchar_t, uint_t, cred_t *cr);
676 extern int	fop_addmap(vnode_t *, offset_t, struct as *, caddr_t, size_t,
677 				uchar_t, uchar_t, uint_t, cred_t *);
678 extern int	fop_delmap(vnode_t *, offset_t, struct as *, caddr_t, size_t,
679 				uint_t, uint_t, uint_t, cred_t *);
680 extern int	fop_poll(vnode_t *, short, int, short *, struct pollhead **);
681 extern int	fop_dump(vnode_t *, caddr_t, int, int);
682 extern int	fop_pathconf(vnode_t *, int, ulong_t *, cred_t *);
683 extern int	fop_pageio(vnode_t *, struct page *, u_offset_t, size_t, int,
684 				cred_t *);
685 extern int	fop_dumpctl(vnode_t *, int, int *);
686 extern void	fop_dispose(vnode_t *, struct page *, int, int, cred_t *);
687 extern int	fop_setsecattr(vnode_t *, vsecattr_t *, int, cred_t *);
688 extern int	fop_getsecattr(vnode_t *, vsecattr_t *, int, cred_t *);
689 extern int	fop_shrlock(vnode_t *, int, struct shrlock *, int, cred_t *);
690 extern int	fop_vnevent(vnode_t *, vnevent_t);
691 
692 #endif	/* _KERNEL */
693 
694 #define	VOP_OPEN(vpp, mode, cr) \
695 	fop_open(vpp, mode, cr)
696 #define	VOP_CLOSE(vp, f, c, o, cr) \
697 	fop_close(vp, f, c, o, cr)
698 #define	VOP_READ(vp, uiop, iof, cr, ct) \
699 	fop_read(vp, uiop, iof, cr, ct)
700 #define	VOP_WRITE(vp, uiop, iof, cr, ct) \
701 	fop_write(vp, uiop, iof, cr, ct)
702 #define	VOP_IOCTL(vp, cmd, a, f, cr, rvp) \
703 	fop_ioctl(vp, cmd, a, f, cr, rvp)
704 #define	VOP_SETFL(vp, f, a, cr) \
705 	fop_setfl(vp, f, a, cr)
706 #define	VOP_GETATTR(vp, vap, f, cr) \
707 	fop_getattr(vp, vap, f, cr)
708 #define	VOP_SETATTR(vp, vap, f, cr, ct) \
709 	fop_setattr(vp, vap, f, cr, ct)
710 #define	VOP_ACCESS(vp, mode, f, cr) \
711 	fop_access(vp, mode, f, cr)
712 #define	VOP_LOOKUP(vp, cp, vpp, pnp, f, rdir, cr) \
713 	fop_lookup(vp, cp, vpp, pnp, f, rdir, cr)
714 #define	VOP_CREATE(dvp, p, vap, ex, mode, vpp, cr, flag) \
715 	fop_create(dvp, p, vap, ex, mode, vpp, cr, flag)
716 #define	VOP_REMOVE(dvp, p, cr) \
717 	fop_remove(dvp, p, cr)
718 #define	VOP_LINK(tdvp, fvp, p, cr) \
719 	fop_link(tdvp, fvp, p, cr)
720 #define	VOP_RENAME(fvp, fnm, tdvp, tnm, cr) \
721 	fop_rename(fvp, fnm, tdvp, tnm, cr)
722 #define	VOP_MKDIR(dp, p, vap, vpp, cr) \
723 	fop_mkdir(dp, p, vap, vpp, cr)
724 #define	VOP_RMDIR(dp, p, cdir, cr) \
725 	fop_rmdir(dp, p, cdir, cr)
726 #define	VOP_READDIR(vp, uiop, cr, eofp) \
727 	fop_readdir(vp, uiop, cr, eofp)
728 #define	VOP_SYMLINK(dvp, lnm, vap, tnm, cr) \
729 	fop_symlink(dvp, lnm, vap, tnm, cr)
730 #define	VOP_READLINK(vp, uiop, cr) \
731 	fop_readlink(vp, uiop, cr)
732 #define	VOP_FSYNC(vp, syncflag, cr) \
733 	fop_fsync(vp, syncflag, cr)
734 #define	VOP_INACTIVE(vp, cr) \
735 	fop_inactive(vp, cr)
736 #define	VOP_FID(vp, fidp) \
737 	fop_fid(vp, fidp)
738 #define	VOP_RWLOCK(vp, w, ct) \
739 	fop_rwlock(vp, w, ct)
740 #define	VOP_RWUNLOCK(vp, w, ct) \
741 	fop_rwunlock(vp, w, ct)
742 #define	VOP_SEEK(vp, ooff, noffp) \
743 	fop_seek(vp, ooff, noffp)
744 #define	VOP_CMP(vp1, vp2) \
745 	fop_cmp(vp1, vp2)
746 #define	VOP_FRLOCK(vp, cmd, a, f, o, cb, cr) \
747 	fop_frlock(vp, cmd, a, f, o, cb, cr)
748 #define	VOP_SPACE(vp, cmd, a, f, o, cr, ct) \
749 	fop_space(vp, cmd, a, f, o, cr, ct)
750 #define	VOP_REALVP(vp1, vp2) \
751 	fop_realvp(vp1, vp2)
752 #define	VOP_GETPAGE(vp, of, sz, pr, pl, ps, sg, a, rw, cr) \
753 	fop_getpage(vp, of, sz, pr, pl, ps, sg, a, rw, cr)
754 #define	VOP_PUTPAGE(vp, of, sz, fl, cr) \
755 	fop_putpage(vp, of, sz, fl, cr)
756 #define	VOP_MAP(vp, of, as, a, sz, p, mp, fl, cr) \
757 	fop_map(vp, of, as, a, sz, p, mp, fl, cr)
758 #define	VOP_ADDMAP(vp, of, as, a, sz, p, mp, fl, cr) \
759 	fop_addmap(vp, of, as, a, sz, p, mp, fl, cr)
760 #define	VOP_DELMAP(vp, of, as, a, sz, p, mp, fl, cr) \
761 	fop_delmap(vp, of, as, a, sz, p, mp, fl, cr)
762 #define	VOP_POLL(vp, events, anyyet, reventsp, phpp) \
763 	fop_poll(vp, events, anyyet, reventsp, phpp)
764 #define	VOP_DUMP(vp, addr, bn, count) \
765 	fop_dump(vp, addr, bn, count)
766 #define	VOP_PATHCONF(vp, cmd, valp, cr) \
767 	fop_pathconf(vp, cmd, valp, cr)
768 #define	VOP_PAGEIO(vp, pp, io_off, io_len, flags, cr) \
769 	fop_pageio(vp, pp, io_off, io_len, flags, cr)
770 #define	VOP_DUMPCTL(vp, action, blkp) \
771 	fop_dumpctl(vp, action, blkp)
772 #define	VOP_DISPOSE(vp, pp, flag, dn, cr) \
773 	fop_dispose(vp, pp, flag, dn, cr)
774 #define	VOP_GETSECATTR(vp, vsap, f, cr) \
775 	fop_getsecattr(vp, vsap, f, cr)
776 #define	VOP_SETSECATTR(vp, vsap, f, cr) \
777 	fop_setsecattr(vp, vsap, f, cr)
778 #define	VOP_SHRLOCK(vp, cmd, shr, f, cr) \
779 	fop_shrlock(vp, cmd, shr, f, cr)
780 #define	VOP_VNEVENT(vp, vnevent) \
781 	fop_vnevent(vp, vnevent)
782 
783 #define	VOPNAME_OPEN		"open"
784 #define	VOPNAME_CLOSE		"close"
785 #define	VOPNAME_READ		"read"
786 #define	VOPNAME_WRITE		"write"
787 #define	VOPNAME_IOCTL		"ioctl"
788 #define	VOPNAME_SETFL		"setfl"
789 #define	VOPNAME_GETATTR		"getattr"
790 #define	VOPNAME_SETATTR		"setattr"
791 #define	VOPNAME_ACCESS		"access"
792 #define	VOPNAME_LOOKUP		"lookup"
793 #define	VOPNAME_CREATE		"create"
794 #define	VOPNAME_REMOVE		"remove"
795 #define	VOPNAME_LINK		"link"
796 #define	VOPNAME_RENAME		"rename"
797 #define	VOPNAME_MKDIR		"mkdir"
798 #define	VOPNAME_RMDIR		"rmdir"
799 #define	VOPNAME_READDIR		"readdir"
800 #define	VOPNAME_SYMLINK		"symlink"
801 #define	VOPNAME_READLINK	"readlink"
802 #define	VOPNAME_FSYNC		"fsync"
803 #define	VOPNAME_INACTIVE	"inactive"
804 #define	VOPNAME_FID		"fid"
805 #define	VOPNAME_RWLOCK		"rwlock"
806 #define	VOPNAME_RWUNLOCK	"rwunlock"
807 #define	VOPNAME_SEEK		"seek"
808 #define	VOPNAME_CMP		"cmp"
809 #define	VOPNAME_FRLOCK		"frlock"
810 #define	VOPNAME_SPACE		"space"
811 #define	VOPNAME_REALVP		"realvp"
812 #define	VOPNAME_GETPAGE		"getpage"
813 #define	VOPNAME_PUTPAGE		"putpage"
814 #define	VOPNAME_MAP		"map"
815 #define	VOPNAME_ADDMAP		"addmap"
816 #define	VOPNAME_DELMAP		"delmap"
817 #define	VOPNAME_POLL		"poll"
818 #define	VOPNAME_DUMP		"dump"
819 #define	VOPNAME_PATHCONF	"pathconf"
820 #define	VOPNAME_PAGEIO		"pageio"
821 #define	VOPNAME_DUMPCTL		"dumpctl"
822 #define	VOPNAME_DISPOSE		"dispose"
823 #define	VOPNAME_GETSECATTR	"getsecattr"
824 #define	VOPNAME_SETSECATTR	"setsecattr"
825 #define	VOPNAME_SHRLOCK		"shrlock"
826 #define	VOPNAME_VNEVENT		"vnevent"
827 
828 /*
829  * Flags for VOP_LOOKUP
830  */
831 #define	LOOKUP_DIR		0x01	/* want parent dir vp */
832 #define	LOOKUP_XATTR		0x02	/* lookup up extended attr dir */
833 #define	CREATE_XATTR_DIR	0x04	/* Create extended attr dir */
834 
835 /*
836  * Flags for VOP_RWLOCK/VOP_RWUNLOCK
837  * VOP_RWLOCK will return the flag that was actually set, or -1 if none.
838  */
839 #define	V_WRITELOCK_TRUE	(1)	/* Request write-lock on the vnode */
840 #define	V_WRITELOCK_FALSE	(0)	/* Request read-lock on the vnode */
841 
842 /*
843  * Flags for VOP_DUMPCTL
844  */
845 #define	DUMP_ALLOC	0
846 #define	DUMP_FREE	1
847 #define	DUMP_SCAN	2
848 
849 /*
850  * Public vnode manipulation functions.
851  */
852 #ifdef	_KERNEL
853 
854 vnode_t *vn_alloc(int);
855 void	vn_reinit(vnode_t *);
856 void	vn_recycle(vnode_t *);
857 void	vn_free(vnode_t *);
858 
859 int	vn_is_readonly(vnode_t *);
860 int   	vn_is_opened(vnode_t *, v_mode_t);
861 int   	vn_is_mapped(vnode_t *, v_mode_t);
862 
863 int	vn_can_change_zones(vnode_t *vp);
864 
865 int	vn_has_flocks(vnode_t *);
866 int	vn_has_mandatory_locks(vnode_t *, int);
867 int	vn_has_cached_data(vnode_t *);
868 
869 void	vn_setops(vnode_t *, vnodeops_t *);
870 vnodeops_t *vn_getops(vnode_t *);
871 int	vn_matchops(vnode_t *, vnodeops_t *);
872 int	vn_matchopval(vnode_t *, char *, fs_generic_func_p);
873 int	vn_ismntpt(vnode_t *);
874 
875 struct vfs *vn_mountedvfs(vnode_t *);
876 
877 void	vn_create_cache(void);
878 void	vn_destroy_cache(void);
879 
880 int	vn_make_ops(const char *, const fs_operation_def_t *, vnodeops_t **);
881 void	vn_freevnodeops(vnodeops_t *);
882 
883 int	vn_open(char *pnamep, enum uio_seg seg, int filemode, int createmode,
884 		struct vnode **vpp, enum create crwhy, mode_t umask);
885 int	vn_openat(char *pnamep, enum uio_seg seg, int filemode, int createmode,
886 		struct vnode **vpp, enum create crwhy,
887 		mode_t umask, struct vnode *startvp);
888 int	vn_create(char *pnamep, enum uio_seg seg, struct vattr *vap,
889 		enum vcexcl excl, int mode, struct vnode **vpp,
890 		enum create why, int flag, mode_t umask);
891 int	vn_createat(char *pnamep, enum uio_seg seg, struct vattr *vap,
892 		enum vcexcl excl, int mode, struct vnode **vpp,
893 		enum create why, int flag, mode_t umask, struct vnode *startvp);
894 int	vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, ssize_t len,
895 		offset_t offset, enum uio_seg seg, int ioflag, rlim64_t ulimit,
896 		cred_t *cr, ssize_t *residp);
897 void	vn_rele(struct vnode *vp);
898 void	vn_rele_stream(struct vnode *vp);
899 int	vn_link(char *from, char *to, enum uio_seg seg);
900 int	vn_rename(char *from, char *to, enum uio_seg seg);
901 int	vn_renameat(vnode_t *fdvp, char *fname, vnode_t *tdvp, char *tname,
902 		enum uio_seg seg);
903 int	vn_remove(char *fnamep, enum uio_seg seg, enum rm dirflag);
904 int	vn_removeat(vnode_t *startvp, char *fnamep, enum uio_seg seg,
905 		enum rm dirflag);
906 int	vn_compare(vnode_t *vp1, vnode_t *vp2);
907 int	vn_vfswlock(struct vnode *vp);
908 int	vn_vfswlock_wait(struct vnode *vp);
909 int	vn_vfsrlock(struct vnode *vp);
910 int	vn_vfsrlock_wait(struct vnode *vp);
911 void	vn_vfsunlock(struct vnode *vp);
912 int	vn_vfswlock_held(struct vnode *vp);
913 vnode_t *specvp(struct vnode *vp, dev_t dev, vtype_t type, struct cred *cr);
914 vnode_t *makespecvp(dev_t dev, vtype_t type);
915 vn_vfslocks_entry_t *vn_vfslocks_getlock(void *);
916 void	vn_vfslocks_rele(vn_vfslocks_entry_t *);
917 
918 void vn_copypath(struct vnode *src, struct vnode *dst);
919 void vn_setpath_str(struct vnode *vp, const char *str, size_t len);
920 void vn_setpath(vnode_t *rootvp, struct vnode *startvp, struct vnode *vp,
921     const char *path, size_t plen);
922 
923 /* Vnode event notification */
924 void	vnevent_rename_src(vnode_t *);
925 void	vnevent_rename_dest(vnode_t *);
926 void	vnevent_remove(vnode_t *);
927 void	vnevent_rmdir(vnode_t *);
928 int	vnevent_support(vnode_t *);
929 
930 /* Context identification */
931 u_longlong_t	fs_new_caller_id();
932 
933 int	vn_vmpss_usepageio(vnode_t *);
934 
935 /*
936  * Needed for use of IS_VMODSORT() in kernel.
937  */
938 extern uint_t pvn_vmodsort_supported;
939 
940 #define	VN_HOLD(vp)	{ \
941 	mutex_enter(&(vp)->v_lock); \
942 	(vp)->v_count++; \
943 	mutex_exit(&(vp)->v_lock); \
944 }
945 
946 #define	VN_RELE(vp)	{ \
947 	vn_rele(vp); \
948 }
949 
950 #define	VN_SET_VFS_TYPE_DEV(vp, vfsp, type, dev)	{ \
951 	(vp)->v_vfsp = (vfsp); \
952 	(vp)->v_type = (type); \
953 	(vp)->v_rdev = (dev); \
954 }
955 
956 /*
957  * Compare two vnodes for equality.  In general this macro should be used
958  * in preference to calling VOP_CMP directly.
959  */
960 #define	VN_CMP(VP1, VP2)	((VP1) == (VP2) ? 1 : 	\
961 	((VP1) && (VP2) && (vn_getops(VP1) == vn_getops(VP2)) ? \
962 	VOP_CMP(VP1, VP2) : 0))
963 
964 #endif	/* _KERNEL */
965 
966 /*
967  * Flags to VOP_SETATTR/VOP_GETATTR.
968  */
969 #define	ATTR_UTIME	0x01	/* non-default utime(2) request */
970 #define	ATTR_EXEC	0x02	/* invocation from exec(2) */
971 #define	ATTR_COMM	0x04	/* yield common vp attributes */
972 #define	ATTR_HINT	0x08	/* information returned will be `hint' */
973 #define	ATTR_REAL	0x10	/* yield attributes of the real vp */
974 
975 /*
976  * Generally useful macros.
977  */
978 #define	VBSIZE(vp)	((vp)->v_vfsp->vfs_bsize)
979 
980 #define	VTOZONE(vp)	((vp)->v_vfsp->vfs_zone)
981 
982 #define	NULLVP		((struct vnode *)0)
983 #define	NULLVPP		((struct vnode **)0)
984 
985 #ifdef	_KERNEL
986 
987 /*
988  * Structure used while handling asynchronous VOP_PUTPAGE operations.
989  */
990 struct async_reqs {
991 	struct async_reqs *a_next;	/* pointer to next arg struct */
992 	struct vnode *a_vp;		/* vnode pointer */
993 	u_offset_t a_off;			/* offset in file */
994 	uint_t a_len;			/* size of i/o request */
995 	int a_flags;			/* flags to indicate operation type */
996 	struct cred *a_cred;		/* cred pointer	*/
997 	ushort_t a_prealloced;		/* set if struct is pre-allocated */
998 };
999 
1000 /*
1001  * VN_DISPOSE() -- given a page pointer, safely invoke VOP_DISPOSE().
1002  */
1003 #define	VN_DISPOSE(pp, flag, dn, cr)	{ \
1004 	extern struct vnode kvp; \
1005 	if ((pp)->p_vnode != NULL && (pp)->p_vnode != &kvp) \
1006 		VOP_DISPOSE((pp)->p_vnode, (pp), (flag), (dn), (cr)); \
1007 	else if ((flag) == B_FREE) \
1008 		page_free((pp), (dn)); \
1009 	else \
1010 		page_destroy((pp), (dn)); \
1011 	}
1012 
1013 #endif	/* _KERNEL */
1014 
1015 #ifdef	__cplusplus
1016 }
1017 #endif
1018 
1019 #endif	/* _SYS_VNODE_H */
1020