xref: /titanic_51/usr/src/uts/common/sys/vnode.h (revision e557d412e15c7f384b2ea3bf316a739a0f81cd55)
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 2010 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 #include <sys/types.h>
43 #include <sys/t_lock.h>
44 #include <sys/rwstlock.h>
45 #include <sys/time_impl.h>
46 #include <sys/cred.h>
47 #include <sys/uio.h>
48 #include <sys/resource.h>
49 #include <vm/seg_enum.h>
50 #include <sys/kstat.h>
51 #include <sys/kmem.h>
52 #include <sys/list.h>
53 #ifdef	_KERNEL
54 #include <sys/buf.h>
55 #endif	/* _KERNEL */
56 
57 #ifdef	__cplusplus
58 extern "C" {
59 #endif
60 
61 /*
62  * Statistics for all vnode operations.
63  * All operations record number of ops (since boot/mount/zero'ed).
64  * Certain I/O operations (read, write, readdir) also record number
65  * of bytes transferred.
66  * This appears in two places in the system: one is embedded in each
67  * vfs_t.  There is also an array of vopstats_t structures allocated
68  * on a per-fstype basis.
69  */
70 
71 #define	VOPSTATS_STR	"vopstats_"	/* Initial string for vopstat kstats */
72 
73 typedef struct vopstats {
74 	kstat_named_t	nopen;		/* VOP_OPEN */
75 	kstat_named_t	nclose;		/* VOP_CLOSE */
76 	kstat_named_t	nread;		/* VOP_READ */
77 	kstat_named_t	read_bytes;
78 	kstat_named_t	nwrite;		/* VOP_WRITE */
79 	kstat_named_t	write_bytes;
80 	kstat_named_t	nioctl;		/* VOP_IOCTL */
81 	kstat_named_t	nsetfl;		/* VOP_SETFL */
82 	kstat_named_t	ngetattr;	/* VOP_GETATTR */
83 	kstat_named_t	nsetattr;	/* VOP_SETATTR */
84 	kstat_named_t	naccess;	/* VOP_ACCESS */
85 	kstat_named_t	nlookup;	/* VOP_LOOKUP */
86 	kstat_named_t	ncreate;	/* VOP_CREATE */
87 	kstat_named_t	nremove;	/* VOP_REMOVE */
88 	kstat_named_t	nlink;		/* VOP_LINK */
89 	kstat_named_t	nrename;	/* VOP_RENAME */
90 	kstat_named_t	nmkdir;		/* VOP_MKDIR */
91 	kstat_named_t	nrmdir;		/* VOP_RMDIR */
92 	kstat_named_t	nreaddir;	/* VOP_READDIR */
93 	kstat_named_t	readdir_bytes;
94 	kstat_named_t	nsymlink;	/* VOP_SYMLINK */
95 	kstat_named_t	nreadlink;	/* VOP_READLINK */
96 	kstat_named_t	nfsync;		/* VOP_FSYNC */
97 	kstat_named_t	ninactive;	/* VOP_INACTIVE */
98 	kstat_named_t	nfid;		/* VOP_FID */
99 	kstat_named_t	nrwlock;	/* VOP_RWLOCK */
100 	kstat_named_t	nrwunlock;	/* VOP_RWUNLOCK */
101 	kstat_named_t	nseek;		/* VOP_SEEK */
102 	kstat_named_t	ncmp;		/* VOP_CMP */
103 	kstat_named_t	nfrlock;	/* VOP_FRLOCK */
104 	kstat_named_t	nspace;		/* VOP_SPACE */
105 	kstat_named_t	nrealvp;	/* VOP_REALVP */
106 	kstat_named_t	ngetpage;	/* VOP_GETPAGE */
107 	kstat_named_t	nputpage;	/* VOP_PUTPAGE */
108 	kstat_named_t	nmap;		/* VOP_MAP */
109 	kstat_named_t	naddmap;	/* VOP_ADDMAP */
110 	kstat_named_t	ndelmap;	/* VOP_DELMAP */
111 	kstat_named_t	npoll;		/* VOP_POLL */
112 	kstat_named_t	ndump;		/* VOP_DUMP */
113 	kstat_named_t	npathconf;	/* VOP_PATHCONF */
114 	kstat_named_t	npageio;	/* VOP_PAGEIO */
115 	kstat_named_t	ndumpctl;	/* VOP_DUMPCTL */
116 	kstat_named_t	ndispose;	/* VOP_DISPOSE */
117 	kstat_named_t	nsetsecattr;	/* VOP_SETSECATTR */
118 	kstat_named_t	ngetsecattr;	/* VOP_GETSECATTR */
119 	kstat_named_t	nshrlock;	/* VOP_SHRLOCK */
120 	kstat_named_t	nvnevent;	/* VOP_VNEVENT */
121 	kstat_named_t	nreqzcbuf;	/* VOP_REQZCBUF */
122 	kstat_named_t	nretzcbuf;	/* VOP_RETZCBUF */
123 } vopstats_t;
124 
125 /*
126  * The vnode is the focus of all file activity in UNIX.
127  * A vnode is allocated for each active file, each current
128  * directory, each mounted-on file, and the root.
129  *
130  * Each vnode is usually associated with a file-system-specific node (for
131  * UFS, this is the in-memory inode).  Generally, a vnode and an fs-node
132  * should be created and destroyed together as a pair.
133  *
134  * If a vnode is reused for a new file, it should be reinitialized by calling
135  * either vn_reinit() or vn_recycle().
136  *
137  * vn_reinit() resets the entire vnode as if it was returned by vn_alloc().
138  * The caller is responsible for setting up the entire vnode after calling
139  * vn_reinit().  This is important when using kmem caching where the vnode is
140  * allocated by a constructor, for instance.
141  *
142  * vn_recycle() is used when the file system keeps some state around in both
143  * the vnode and the associated FS-node.  In UFS, for example, the inode of
144  * a deleted file can be reused immediately.  The v_data, v_vfsp, v_op, etc.
145  * remains the same but certain fields related to the previous instance need
146  * to be reset.  In particular:
147  *	v_femhead
148  *	v_path
149  *	v_rdcnt, v_wrcnt
150  *	v_mmap_read, v_mmap_write
151  */
152 
153 /*
154  * vnode types.  VNON means no type.  These values are unrelated to
155  * values in on-disk inodes.
156  */
157 typedef enum vtype {
158 	VNON	= 0,
159 	VREG	= 1,
160 	VDIR	= 2,
161 	VBLK	= 3,
162 	VCHR	= 4,
163 	VLNK	= 5,
164 	VFIFO	= 6,
165 	VDOOR	= 7,
166 	VPROC	= 8,
167 	VSOCK	= 9,
168 	VPORT	= 10,
169 	VBAD	= 11
170 } vtype_t;
171 
172 /*
173  * VSD - Vnode Specific Data
174  * Used to associate additional private data with a vnode.
175  */
176 struct vsd_node {
177 	list_node_t vs_nodes;		/* list of all VSD nodes */
178 	uint_t vs_nkeys;		/* entries in value array */
179 	void **vs_value;		/* array of value/key */
180 };
181 
182 /*
183  * Many of the fields in the vnode are read-only once they are initialized
184  * at vnode creation time.  Other fields are protected by locks.
185  *
186  * IMPORTANT: vnodes should be created ONLY by calls to vn_alloc().  They
187  * may not be embedded into the file-system specific node (inode).  The
188  * size of vnodes may change.
189  *
190  * The v_lock protects:
191  *   v_flag
192  *   v_stream
193  *   v_count
194  *   v_shrlocks
195  *   v_path
196  *   v_vsd
197  *   v_xattrdir
198  *
199  * A special lock (implemented by vn_vfswlock in vnode.c) protects:
200  *   v_vfsmountedhere
201  *
202  * The global flock_lock mutex (in flock.c) protects:
203  *   v_filocks
204  *
205  * IMPORTANT NOTE:
206  *
207  *   The following vnode fields are considered public and may safely be
208  *   accessed by file systems or other consumers:
209  *
210  *     v_lock
211  *     v_flag
212  *     v_count
213  *     v_data
214  *     v_vfsp
215  *     v_stream
216  *     v_type
217  *     v_rdev
218  *
219  * ALL OTHER FIELDS SHOULD BE ACCESSED ONLY BY THE OWNER OF THAT FIELD.
220  * In particular, file systems should not access other fields; they may
221  * change or even be removed.  The functionality which was once provided
222  * by these fields is available through vn_* functions.
223  */
224 
225 struct fem_head;	/* from fem.h */
226 
227 typedef struct vnode {
228 	kmutex_t	v_lock;		/* protects vnode fields */
229 	uint_t		v_flag;		/* vnode flags (see below) */
230 	uint_t		v_count;	/* reference count */
231 	void		*v_data;	/* private data for fs */
232 	struct vfs	*v_vfsp;	/* ptr to containing VFS */
233 	struct stdata	*v_stream;	/* associated stream */
234 	enum vtype	v_type;		/* vnode type */
235 	dev_t		v_rdev;		/* device (VCHR, VBLK) */
236 
237 	/* PRIVATE FIELDS BELOW - DO NOT USE */
238 
239 	struct vfs	*v_vfsmountedhere; /* ptr to vfs mounted here */
240 	struct vnodeops	*v_op;		/* vnode operations */
241 	struct page	*v_pages;	/* vnode pages list */
242 	struct filock	*v_filocks;	/* ptr to filock list */
243 	struct shrlocklist *v_shrlocks;	/* ptr to shrlock list */
244 	krwlock_t	v_nbllock;	/* sync for NBMAND locks */
245 	kcondvar_t	v_cv;		/* synchronize locking */
246 	void		*v_locality;	/* hook for locality info */
247 	struct fem_head	*v_femhead;	/* fs monitoring */
248 	char		*v_path;	/* cached path */
249 	uint_t		v_rdcnt;	/* open for read count  (VREG only) */
250 	uint_t		v_wrcnt;	/* open for write count (VREG only) */
251 	u_longlong_t	v_mmap_read;	/* mmap read count */
252 	u_longlong_t	v_mmap_write;	/* mmap write count */
253 	void		*v_mpssdata;	/* info for large page mappings */
254 	void		*v_fopdata;	/* list of file ops event watches */
255 	kmutex_t	v_vsd_lock;	/* protects v_vsd field */
256 	struct vsd_node *v_vsd;		/* vnode specific data */
257 	struct vnode	*v_xattrdir;	/* unnamed extended attr dir (GFS) */
258 	uint_t		v_count_dnlc;	/* dnlc reference count */
259 } vnode_t;
260 
261 #define	IS_DEVVP(vp)	\
262 	((vp)->v_type == VCHR || (vp)->v_type == VBLK || (vp)->v_type == VFIFO)
263 
264 /*
265  * vnode flags.
266  */
267 #define	VROOT		0x01	/* root of its file system */
268 #define	VNOCACHE	0x02	/* don't keep cache pages on vnode */
269 #define	VNOMAP		0x04	/* file cannot be mapped/faulted */
270 #define	VDUP		0x08	/* file should be dup'ed rather then opened */
271 #define	VNOSWAP		0x10	/* file cannot be used as virtual swap device */
272 #define	VNOMOUNT	0x20	/* file cannot be covered by mount */
273 #define	VISSWAP		0x40	/* vnode is being used for swap */
274 #define	VSWAPLIKE	0x80	/* vnode acts like swap (but may not be) */
275 
276 #define	IS_SWAPVP(vp)	(((vp)->v_flag & (VISSWAP | VSWAPLIKE)) != 0)
277 
278 typedef struct vn_vfslocks_entry {
279 	rwstlock_t ve_lock;
280 	void *ve_vpvfs;
281 	struct vn_vfslocks_entry *ve_next;
282 	uint32_t ve_refcnt;
283 	char pad[64 - sizeof (rwstlock_t) - 2 * sizeof (void *) - \
284 	    sizeof (uint32_t)];
285 } vn_vfslocks_entry_t;
286 
287 /*
288  * The following two flags are used to lock the v_vfsmountedhere field
289  */
290 #define	VVFSLOCK	0x100
291 #define	VVFSWAIT	0x200
292 
293 /*
294  * Used to serialize VM operations on a vnode
295  */
296 #define	VVMLOCK		0x400
297 
298 /*
299  * Tell vn_open() not to fail a directory open for writing but
300  * to go ahead and call VOP_OPEN() to let the filesystem check.
301  */
302 #define	VDIROPEN	0x800
303 
304 /*
305  * Flag to let the VM system know that this file is most likely a binary
306  * or shared library since it has been mmap()ed EXEC at some time.
307  */
308 #define	VVMEXEC		0x1000
309 
310 #define	VPXFS		0x2000  /* clustering: global fs proxy vnode */
311 
312 #define	IS_PXFSVP(vp)	((vp)->v_flag & VPXFS)
313 
314 #define	V_XATTRDIR	0x4000	/* attribute unnamed directory */
315 
316 #define	IS_XATTRDIR(vp)	((vp)->v_flag & V_XATTRDIR)
317 
318 #define	V_LOCALITY	0x8000	/* whether locality aware */
319 
320 /*
321  * Flag that indicates the VM should maintain the v_pages list with all modified
322  * pages on one end and unmodified pages at the other. This makes finding dirty
323  * pages to write back to disk much faster at the expense of taking a minor
324  * fault on the first store instruction which touches a writable page.
325  */
326 #define	VMODSORT	(0x10000)
327 #define	IS_VMODSORT(vp) \
328 	(pvn_vmodsort_supported != 0 && ((vp)->v_flag  & VMODSORT) != 0)
329 
330 #define	VISSWAPFS	0x20000	/* vnode is being used for swapfs */
331 
332 /*
333  * The mdb memstat command assumes that IS_SWAPFSVP only uses the
334  * vnode's v_flag field.  If this changes, cache the additional
335  * fields in mdb; see vn_get in mdb/common/modules/genunix/memory.c
336  */
337 #define	IS_SWAPFSVP(vp)	(((vp)->v_flag & VISSWAPFS) != 0)
338 
339 #define	V_SYSATTR	0x40000	/* vnode is a GFS system attribute */
340 
341 /*
342  * Vnode attributes.  A bit-mask is supplied as part of the
343  * structure to indicate the attributes the caller wants to
344  * set (setattr) or extract (getattr).
345  */
346 
347 /*
348  * Note that va_nodeid and va_nblocks are 64bit data type.
349  * We support large files over NFSV3. With Solaris client and
350  * Server that generates 64bit ino's and sizes these fields
351  * will overflow if they are 32 bit sizes.
352  */
353 
354 typedef struct vattr {
355 	uint_t		va_mask;	/* bit-mask of attributes */
356 	vtype_t		va_type;	/* vnode type (for create) */
357 	mode_t		va_mode;	/* file access mode */
358 	uid_t		va_uid;		/* owner user id */
359 	gid_t		va_gid;		/* owner group id */
360 	dev_t		va_fsid;	/* file system id (dev for now) */
361 	u_longlong_t	va_nodeid;	/* node id */
362 	nlink_t		va_nlink;	/* number of references to file */
363 	u_offset_t	va_size;	/* file size in bytes */
364 	timestruc_t	va_atime;	/* time of last access */
365 	timestruc_t	va_mtime;	/* time of last modification */
366 	timestruc_t	va_ctime;	/* time of last status change */
367 	dev_t		va_rdev;	/* device the file represents */
368 	uint_t		va_blksize;	/* fundamental block size */
369 	u_longlong_t	va_nblocks;	/* # of blocks allocated */
370 	uint_t		va_seq;		/* sequence number */
371 } vattr_t;
372 
373 #define	AV_SCANSTAMP_SZ	32		/* length of anti-virus scanstamp */
374 
375 /*
376  * Structure of all optional attributes.
377  */
378 typedef struct xoptattr {
379 	timestruc_t	xoa_createtime;	/* Create time of file */
380 	uint8_t		xoa_archive;
381 	uint8_t		xoa_system;
382 	uint8_t		xoa_readonly;
383 	uint8_t		xoa_hidden;
384 	uint8_t		xoa_nounlink;
385 	uint8_t		xoa_immutable;
386 	uint8_t		xoa_appendonly;
387 	uint8_t		xoa_nodump;
388 	uint8_t		xoa_opaque;
389 	uint8_t		xoa_av_quarantined;
390 	uint8_t		xoa_av_modified;
391 	uint8_t		xoa_av_scanstamp[AV_SCANSTAMP_SZ];
392 	uint8_t		xoa_reparse;
393 } xoptattr_t;
394 
395 /*
396  * The xvattr structure is really a variable length structure that
397  * is made up of:
398  * - The classic vattr_t (xva_vattr)
399  * - a 32 bit quantity (xva_mapsize) that specifies the size of the
400  *   attribute bitmaps in 32 bit words.
401  * - A pointer to the returned attribute bitmap (needed because the
402  *   previous element, the requested attribute bitmap) is variable lenth.
403  * - The requested attribute bitmap, which is an array of 32 bit words.
404  *   Callers use the XVA_SET_REQ() macro to set the bits corresponding to
405  *   the attributes that are being requested.
406  * - The returned attribute bitmap, which is an array of 32 bit words.
407  *   File systems that support optional attributes use the XVA_SET_RTN()
408  *   macro to set the bits corresponding to the attributes that are being
409  *   returned.
410  * - The xoptattr_t structure which contains the attribute values
411  *
412  * xva_mapsize determines how many words in the attribute bitmaps.
413  * Immediately following the attribute bitmaps is the xoptattr_t.
414  * xva_getxoptattr() is used to get the pointer to the xoptattr_t
415  * section.
416  */
417 
418 #define	XVA_MAPSIZE	3		/* Size of attr bitmaps */
419 #define	XVA_MAGIC	0x78766174	/* Magic # for verification */
420 
421 /*
422  * The xvattr structure is an extensible structure which permits optional
423  * attributes to be requested/returned.  File systems may or may not support
424  * optional attributes.  They do so at their own discretion but if they do
425  * support optional attributes, they must register the VFSFT_XVATTR feature
426  * so that the optional attributes can be set/retrived.
427  *
428  * The fields of the xvattr structure are:
429  *
430  * xva_vattr - The first element of an xvattr is a legacy vattr structure
431  * which includes the common attributes.  If AT_XVATTR is set in the va_mask
432  * then the entire structure is treated as an xvattr.  If AT_XVATTR is not
433  * set, then only the xva_vattr structure can be used.
434  *
435  * xva_magic - 0x78766174 (hex for "xvat"). Magic number for verification.
436  *
437  * xva_mapsize - Size of requested and returned attribute bitmaps.
438  *
439  * xva_rtnattrmapp - Pointer to xva_rtnattrmap[].  We need this since the
440  * size of the array before it, xva_reqattrmap[], could change which means
441  * the location of xva_rtnattrmap[] could change.  This will allow unbundled
442  * file systems to find the location of xva_rtnattrmap[] when the sizes change.
443  *
444  * xva_reqattrmap[] - Array of requested attributes.  Attributes are
445  * represented by a specific bit in a specific element of the attribute
446  * map array.  Callers set the bits corresponding to the attributes
447  * that the caller wants to get/set.
448  *
449  * xva_rtnattrmap[] - Array of attributes that the file system was able to
450  * process.  Not all file systems support all optional attributes.  This map
451  * informs the caller which attributes the underlying file system was able
452  * to set/get.  (Same structure as the requested attributes array in terms
453  * of each attribute  corresponding to specific bits and array elements.)
454  *
455  * xva_xoptattrs - Structure containing values of optional attributes.
456  * These values are only valid if the corresponding bits in xva_reqattrmap
457  * are set and the underlying file system supports those attributes.
458  */
459 typedef struct xvattr {
460 	vattr_t		xva_vattr;	/* Embedded vattr structure */
461 	uint32_t	xva_magic;	/* Magic Number */
462 	uint32_t	xva_mapsize;	/* Size of attr bitmap (32-bit words) */
463 	uint32_t	*xva_rtnattrmapp;	/* Ptr to xva_rtnattrmap[] */
464 	uint32_t	xva_reqattrmap[XVA_MAPSIZE];	/* Requested attrs */
465 	uint32_t	xva_rtnattrmap[XVA_MAPSIZE];	/* Returned attrs */
466 	xoptattr_t	xva_xoptattrs;	/* Optional attributes */
467 } xvattr_t;
468 
469 #ifdef _SYSCALL32
470 /*
471  * For bigtypes time_t changed to 64 bit on the 64-bit kernel.
472  * Define an old version for user/kernel interface
473  */
474 
475 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
476 #pragma pack(4)
477 #endif
478 
479 typedef struct vattr32 {
480 	uint32_t	va_mask;	/* bit-mask of attributes */
481 	vtype_t		va_type;	/* vnode type (for create) */
482 	mode32_t	va_mode;	/* file access mode */
483 	uid32_t		va_uid;		/* owner user id */
484 	gid32_t		va_gid;		/* owner group id */
485 	dev32_t		va_fsid;	/* file system id (dev for now) */
486 	u_longlong_t	va_nodeid;	/* node id */
487 	nlink_t		va_nlink;	/* number of references to file */
488 	u_offset_t	va_size;	/* file size in bytes */
489 	timestruc32_t	va_atime;	/* time of last access */
490 	timestruc32_t	va_mtime;	/* time of last modification */
491 	timestruc32_t	va_ctime;	/* time of last status change */
492 	dev32_t		va_rdev;	/* device the file represents */
493 	uint32_t	va_blksize;	/* fundamental block size */
494 	u_longlong_t	va_nblocks;	/* # of blocks allocated */
495 	uint32_t	va_seq;		/* sequence number */
496 } vattr32_t;
497 
498 #if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
499 #pragma pack()
500 #endif
501 
502 #else  /* not _SYSCALL32 */
503 #define	vattr32		vattr
504 typedef vattr_t		vattr32_t;
505 #endif /* _SYSCALL32 */
506 
507 /*
508  * Attributes of interest to the caller of setattr or getattr.
509  */
510 #define	AT_TYPE		0x00001
511 #define	AT_MODE		0x00002
512 #define	AT_UID		0x00004
513 #define	AT_GID		0x00008
514 #define	AT_FSID		0x00010
515 #define	AT_NODEID	0x00020
516 #define	AT_NLINK	0x00040
517 #define	AT_SIZE		0x00080
518 #define	AT_ATIME	0x00100
519 #define	AT_MTIME	0x00200
520 #define	AT_CTIME	0x00400
521 #define	AT_RDEV		0x00800
522 #define	AT_BLKSIZE	0x01000
523 #define	AT_NBLOCKS	0x02000
524 /*			0x04000 */	/* unused */
525 #define	AT_SEQ		0x08000
526 /*
527  * If AT_XVATTR is set then there are additional bits to process in
528  * the xvattr_t's attribute bitmap.  If this is not set then the bitmap
529  * MUST be ignored.  Note that this bit must be set/cleared explicitly.
530  * That is, setting AT_ALL will NOT set AT_XVATTR.
531  */
532 #define	AT_XVATTR	0x10000
533 
534 #define	AT_ALL		(AT_TYPE|AT_MODE|AT_UID|AT_GID|AT_FSID|AT_NODEID|\
535 			AT_NLINK|AT_SIZE|AT_ATIME|AT_MTIME|AT_CTIME|\
536 			AT_RDEV|AT_BLKSIZE|AT_NBLOCKS|AT_SEQ)
537 
538 #define	AT_STAT		(AT_MODE|AT_UID|AT_GID|AT_FSID|AT_NODEID|AT_NLINK|\
539 			AT_SIZE|AT_ATIME|AT_MTIME|AT_CTIME|AT_RDEV|AT_TYPE)
540 
541 #define	AT_TIMES	(AT_ATIME|AT_MTIME|AT_CTIME)
542 
543 #define	AT_NOSET	(AT_NLINK|AT_RDEV|AT_FSID|AT_NODEID|AT_TYPE|\
544 			AT_BLKSIZE|AT_NBLOCKS|AT_SEQ)
545 
546 /*
547  * Attribute bits used in the extensible attribute's (xva's) attribute
548  * bitmaps.  Note that the bitmaps are made up of a variable length number
549  * of 32-bit words.  The convention is to use XAT{n}_{attrname} where "n"
550  * is the element in the bitmap (starting at 1).  This convention is for
551  * the convenience of the maintainer to keep track of which element each
552  * attribute belongs to.
553  *
554  * NOTE THAT CONSUMERS MUST *NOT* USE THE XATn_* DEFINES DIRECTLY.  CONSUMERS
555  * MUST USE THE XAT_* DEFINES.
556  */
557 #define	XAT0_INDEX	0LL		/* Index into bitmap for XAT0 attrs */
558 #define	XAT0_CREATETIME	0x00000001	/* Create time of file */
559 #define	XAT0_ARCHIVE	0x00000002	/* Archive */
560 #define	XAT0_SYSTEM	0x00000004	/* System */
561 #define	XAT0_READONLY	0x00000008	/* Readonly */
562 #define	XAT0_HIDDEN	0x00000010	/* Hidden */
563 #define	XAT0_NOUNLINK	0x00000020	/* Nounlink */
564 #define	XAT0_IMMUTABLE	0x00000040	/* immutable */
565 #define	XAT0_APPENDONLY	0x00000080	/* appendonly */
566 #define	XAT0_NODUMP	0x00000100	/* nodump */
567 #define	XAT0_OPAQUE	0x00000200	/* opaque */
568 #define	XAT0_AV_QUARANTINED	0x00000400	/* anti-virus quarantine */
569 #define	XAT0_AV_MODIFIED	0x00000800	/* anti-virus modified */
570 #define	XAT0_AV_SCANSTAMP	0x00001000	/* anti-virus scanstamp */
571 #define	XAT0_REPARSE	0x00002000	/* FS reparse point */
572 
573 #define	XAT0_ALL_ATTRS	(XAT0_CREATETIME|XAT0_ARCHIVE|XAT0_SYSTEM| \
574     XAT0_READONLY|XAT0_HIDDEN|XAT0_NOUNLINK|XAT0_IMMUTABLE|XAT0_APPENDONLY| \
575     XAT0_NODUMP|XAT0_OPAQUE|XAT0_AV_QUARANTINED| \
576     XAT0_AV_MODIFIED|XAT0_AV_SCANSTAMP|XAT0_REPARSE)
577 
578 /* Support for XAT_* optional attributes */
579 #define	XVA_MASK		0xffffffff	/* Used to mask off 32 bits */
580 #define	XVA_SHFT		32		/* Used to shift index */
581 
582 /*
583  * Used to pry out the index and attribute bits from the XAT_* attributes
584  * defined below.  Note that we're masking things down to 32 bits then
585  * casting to uint32_t.
586  */
587 #define	XVA_INDEX(attr)		((uint32_t)(((attr) >> XVA_SHFT) & XVA_MASK))
588 #define	XVA_ATTRBIT(attr)	((uint32_t)((attr) & XVA_MASK))
589 
590 /*
591  * The following defines present a "flat namespace" so that consumers don't
592  * need to keep track of which element belongs to which bitmap entry.
593  *
594  * NOTE THAT THESE MUST NEVER BE OR-ed TOGETHER
595  */
596 #define	XAT_CREATETIME		((XAT0_INDEX << XVA_SHFT) | XAT0_CREATETIME)
597 #define	XAT_ARCHIVE		((XAT0_INDEX << XVA_SHFT) | XAT0_ARCHIVE)
598 #define	XAT_SYSTEM		((XAT0_INDEX << XVA_SHFT) | XAT0_SYSTEM)
599 #define	XAT_READONLY		((XAT0_INDEX << XVA_SHFT) | XAT0_READONLY)
600 #define	XAT_HIDDEN		((XAT0_INDEX << XVA_SHFT) | XAT0_HIDDEN)
601 #define	XAT_NOUNLINK		((XAT0_INDEX << XVA_SHFT) | XAT0_NOUNLINK)
602 #define	XAT_IMMUTABLE		((XAT0_INDEX << XVA_SHFT) | XAT0_IMMUTABLE)
603 #define	XAT_APPENDONLY		((XAT0_INDEX << XVA_SHFT) | XAT0_APPENDONLY)
604 #define	XAT_NODUMP		((XAT0_INDEX << XVA_SHFT) | XAT0_NODUMP)
605 #define	XAT_OPAQUE		((XAT0_INDEX << XVA_SHFT) | XAT0_OPAQUE)
606 #define	XAT_AV_QUARANTINED	((XAT0_INDEX << XVA_SHFT) | XAT0_AV_QUARANTINED)
607 #define	XAT_AV_MODIFIED		((XAT0_INDEX << XVA_SHFT) | XAT0_AV_MODIFIED)
608 #define	XAT_AV_SCANSTAMP	((XAT0_INDEX << XVA_SHFT) | XAT0_AV_SCANSTAMP)
609 #define	XAT_REPARSE		((XAT0_INDEX << XVA_SHFT) | XAT0_REPARSE)
610 
611 /*
612  * The returned attribute map array (xva_rtnattrmap[]) is located past the
613  * requested attribute map array (xva_reqattrmap[]).  Its location changes
614  * when the array sizes change.  We use a separate pointer in a known location
615  * (xva_rtnattrmapp) to hold the location of xva_rtnattrmap[].  This is
616  * set in xva_init()
617  */
618 #define	XVA_RTNATTRMAP(xvap)	((xvap)->xva_rtnattrmapp)
619 
620 /*
621  * XVA_SET_REQ() sets an attribute bit in the proper element in the bitmap
622  * of requested attributes (xva_reqattrmap[]).
623  */
624 #define	XVA_SET_REQ(xvap, attr)					\
625 	ASSERT((xvap)->xva_vattr.va_mask | AT_XVATTR);		\
626 	ASSERT((xvap)->xva_magic == XVA_MAGIC);			\
627 	(xvap)->xva_reqattrmap[XVA_INDEX(attr)] |= XVA_ATTRBIT(attr)
628 /*
629  * XVA_CLR_REQ() clears an attribute bit in the proper element in the bitmap
630  * of requested attributes (xva_reqattrmap[]).
631  */
632 #define	XVA_CLR_REQ(xvap, attr)					\
633 	ASSERT((xvap)->xva_vattr.va_mask | AT_XVATTR);		\
634 	ASSERT((xvap)->xva_magic == XVA_MAGIC);			\
635 	(xvap)->xva_reqattrmap[XVA_INDEX(attr)] &= ~XVA_ATTRBIT(attr)
636 
637 /*
638  * XVA_SET_RTN() sets an attribute bit in the proper element in the bitmap
639  * of returned attributes (xva_rtnattrmap[]).
640  */
641 #define	XVA_SET_RTN(xvap, attr)					\
642 	ASSERT((xvap)->xva_vattr.va_mask | AT_XVATTR);		\
643 	ASSERT((xvap)->xva_magic == XVA_MAGIC);			\
644 	(XVA_RTNATTRMAP(xvap))[XVA_INDEX(attr)] |= XVA_ATTRBIT(attr)
645 
646 /*
647  * XVA_ISSET_REQ() checks the requested attribute bitmap (xva_reqattrmap[])
648  * to see of the corresponding attribute bit is set.  If so, returns non-zero.
649  */
650 #define	XVA_ISSET_REQ(xvap, attr)					\
651 	((((xvap)->xva_vattr.va_mask | AT_XVATTR) &&			\
652 		((xvap)->xva_magic == XVA_MAGIC) &&			\
653 		((xvap)->xva_mapsize > XVA_INDEX(attr))) ?		\
654 	((xvap)->xva_reqattrmap[XVA_INDEX(attr)] & XVA_ATTRBIT(attr)) :	0)
655 
656 /*
657  * XVA_ISSET_RTN() checks the returned attribute bitmap (xva_rtnattrmap[])
658  * to see of the corresponding attribute bit is set.  If so, returns non-zero.
659  */
660 #define	XVA_ISSET_RTN(xvap, attr)					\
661 	((((xvap)->xva_vattr.va_mask | AT_XVATTR) &&			\
662 		((xvap)->xva_magic == XVA_MAGIC) &&			\
663 		((xvap)->xva_mapsize > XVA_INDEX(attr))) ?		\
664 	((XVA_RTNATTRMAP(xvap))[XVA_INDEX(attr)] & XVA_ATTRBIT(attr)) : 0)
665 
666 /*
667  *  Modes.  Some values same as S_xxx entries from stat.h for convenience.
668  */
669 #define	VSUID		04000		/* set user id on execution */
670 #define	VSGID		02000		/* set group id on execution */
671 #define	VSVTX		01000		/* save swapped text even after use */
672 
673 /*
674  * Permissions.
675  */
676 #define	VREAD		00400
677 #define	VWRITE		00200
678 #define	VEXEC		00100
679 
680 #define	MODEMASK	07777		/* mode bits plus permission bits */
681 #define	PERMMASK	00777		/* permission bits */
682 
683 /*
684  * VOP_ACCESS flags
685  */
686 #define	V_ACE_MASK	0x1	/* mask represents  NFSv4 ACE permissions */
687 #define	V_APPEND	0x2	/* want to do append only check */
688 
689 /*
690  * Check whether mandatory file locking is enabled.
691  */
692 
693 #define	MANDMODE(mode)		(((mode) & (VSGID|(VEXEC>>3))) == VSGID)
694 #define	MANDLOCK(vp, mode)	((vp)->v_type == VREG && MANDMODE(mode))
695 
696 /*
697  * Flags for vnode operations.
698  */
699 enum rm		{ RMFILE, RMDIRECTORY };	/* rm or rmdir (remove) */
700 enum symfollow	{ NO_FOLLOW, FOLLOW };		/* follow symlinks (or not) */
701 enum vcexcl	{ NONEXCL, EXCL };		/* (non)excl create */
702 enum create	{ CRCREAT, CRMKNOD, CRMKDIR };	/* reason for create */
703 
704 typedef enum rm		rm_t;
705 typedef enum symfollow	symfollow_t;
706 typedef enum vcexcl	vcexcl_t;
707 typedef enum create	create_t;
708 
709 /* Vnode Events - Used by VOP_VNEVENT */
710 typedef enum vnevent	{
711 	VE_SUPPORT	= 0,	/* Query */
712 	VE_RENAME_SRC	= 1,	/* Rename, with vnode as source */
713 	VE_RENAME_DEST	= 2,	/* Rename, with vnode as target/destination */
714 	VE_REMOVE	= 3,	/* Remove of vnode's name */
715 	VE_RMDIR	= 4,	/* Remove of directory vnode's name */
716 	VE_CREATE	= 5,	/* Create with vnode's name which exists */
717 	VE_LINK		= 6, 	/* Link with vnode's name as source */
718 	VE_RENAME_DEST_DIR	= 7, 	/* Rename with vnode as target dir */
719 	VE_MOUNTEDOVER	= 8 	/* File or Filesystem got mounted over vnode */
720 } vnevent_t;
721 
722 /*
723  * Values for checking vnode open and map counts
724  */
725 enum v_mode { V_READ, V_WRITE, V_RDORWR, V_RDANDWR };
726 
727 typedef enum v_mode v_mode_t;
728 
729 #define	V_TRUE	1
730 #define	V_FALSE	0
731 
732 /*
733  * Structure used on VOP_GETSECATTR and VOP_SETSECATTR operations
734  */
735 
736 typedef struct vsecattr {
737 	uint_t		vsa_mask;	/* See below */
738 	int		vsa_aclcnt;	/* ACL entry count */
739 	void		*vsa_aclentp;	/* pointer to ACL entries */
740 	int		vsa_dfaclcnt;	/* default ACL entry count */
741 	void		*vsa_dfaclentp;	/* pointer to default ACL entries */
742 	size_t		vsa_aclentsz;	/* ACE size in bytes of vsa_aclentp */
743 	uint_t		vsa_aclflags;	/* ACE ACL flags */
744 } vsecattr_t;
745 
746 /* vsa_mask values */
747 #define	VSA_ACL			0x0001
748 #define	VSA_ACLCNT		0x0002
749 #define	VSA_DFACL		0x0004
750 #define	VSA_DFACLCNT		0x0008
751 #define	VSA_ACE			0x0010
752 #define	VSA_ACECNT		0x0020
753 #define	VSA_ACE_ALLTYPES	0x0040
754 #define	VSA_ACE_ACLFLAGS	0x0080	/* get/set ACE ACL flags */
755 
756 /*
757  * Structure used by various vnode operations to determine
758  * the context (pid, host, identity) of a caller.
759  *
760  * The cc_caller_id is used to identify one or more callers who invoke
761  * operations, possibly on behalf of others.  For example, the NFS
762  * server could have it's own cc_caller_id which can be detected by
763  * vnode/vfs operations or (FEM) monitors on those operations.  New
764  * caller IDs are generated by fs_new_caller_id().
765  */
766 typedef struct caller_context {
767 	pid_t		cc_pid;		/* Process ID of the caller */
768 	int		cc_sysid;	/* System ID, used for remote calls */
769 	u_longlong_t	cc_caller_id;	/* Identifier for (set of) caller(s) */
770 	ulong_t		cc_flags;
771 } caller_context_t;
772 
773 /*
774  * Flags for caller context.  The caller sets CC_DONTBLOCK if it does not
775  * want to block inside of a FEM monitor.  The monitor will set CC_WOULDBLOCK
776  * and return EAGAIN if the operation would have blocked.
777  */
778 #define	CC_WOULDBLOCK	0x01
779 #define	CC_DONTBLOCK	0x02
780 
781 /*
782  * Structure tags for function prototypes, defined elsewhere.
783  */
784 struct pathname;
785 struct fid;
786 struct flock64;
787 struct flk_callback;
788 struct shrlock;
789 struct page;
790 struct seg;
791 struct as;
792 struct pollhead;
793 struct taskq;
794 
795 #ifdef	_KERNEL
796 
797 /*
798  * VNODE_OPS defines all the vnode operations.  It is used to define
799  * the vnodeops structure (below) and the fs_func_p union (vfs_opreg.h).
800  */
801 #define	VNODE_OPS							\
802 	int	(*vop_open)(vnode_t **, int, cred_t *,			\
803 				caller_context_t *);			\
804 	int	(*vop_close)(vnode_t *, int, int, offset_t, cred_t *,	\
805 				caller_context_t *);			\
806 	int	(*vop_read)(vnode_t *, uio_t *, int, cred_t *,		\
807 				caller_context_t *);			\
808 	int	(*vop_write)(vnode_t *, uio_t *, int, cred_t *,		\
809 				caller_context_t *);			\
810 	int	(*vop_ioctl)(vnode_t *, int, intptr_t, int, cred_t *,	\
811 				int *, caller_context_t *);		\
812 	int	(*vop_setfl)(vnode_t *, int, int, cred_t *,		\
813 				caller_context_t *);			\
814 	int	(*vop_getattr)(vnode_t *, vattr_t *, int, cred_t *,	\
815 				caller_context_t *);			\
816 	int	(*vop_setattr)(vnode_t *, vattr_t *, int, cred_t *,	\
817 				caller_context_t *);			\
818 	int	(*vop_access)(vnode_t *, int, int, cred_t *,		\
819 				caller_context_t *);			\
820 	int	(*vop_lookup)(vnode_t *, char *, vnode_t **,		\
821 				struct pathname *,			\
822 				int, vnode_t *, cred_t *,		\
823 				caller_context_t *, int *,		\
824 				struct pathname *);			\
825 	int	(*vop_create)(vnode_t *, char *, vattr_t *, vcexcl_t,	\
826 				int, vnode_t **, cred_t *, int,		\
827 				caller_context_t *, vsecattr_t *);	\
828 	int	(*vop_remove)(vnode_t *, char *, cred_t *,		\
829 				caller_context_t *, int);		\
830 	int	(*vop_link)(vnode_t *, vnode_t *, char *, cred_t *,	\
831 				caller_context_t *, int);		\
832 	int	(*vop_rename)(vnode_t *, char *, vnode_t *, char *,	\
833 				cred_t *, caller_context_t *, int);	\
834 	int	(*vop_mkdir)(vnode_t *, char *, vattr_t *, vnode_t **,	\
835 				cred_t *, caller_context_t *, int,	\
836 				vsecattr_t *);				\
837 	int	(*vop_rmdir)(vnode_t *, char *, vnode_t *, cred_t *,	\
838 				caller_context_t *, int);		\
839 	int	(*vop_readdir)(vnode_t *, uio_t *, cred_t *, int *,	\
840 				caller_context_t *, int);		\
841 	int	(*vop_symlink)(vnode_t *, char *, vattr_t *, char *,	\
842 				cred_t *, caller_context_t *, int);	\
843 	int	(*vop_readlink)(vnode_t *, uio_t *, cred_t *,		\
844 				caller_context_t *);			\
845 	int	(*vop_fsync)(vnode_t *, int, cred_t *,			\
846 				caller_context_t *);			\
847 	void	(*vop_inactive)(vnode_t *, cred_t *,			\
848 				caller_context_t *);			\
849 	int	(*vop_fid)(vnode_t *, struct fid *,			\
850 				caller_context_t *);			\
851 	int	(*vop_rwlock)(vnode_t *, int, caller_context_t *);	\
852 	void	(*vop_rwunlock)(vnode_t *, int, caller_context_t *);	\
853 	int	(*vop_seek)(vnode_t *, offset_t, offset_t *,		\
854 				caller_context_t *);			\
855 	int	(*vop_cmp)(vnode_t *, vnode_t *, caller_context_t *);	\
856 	int	(*vop_frlock)(vnode_t *, int, struct flock64 *,		\
857 				int, offset_t,				\
858 				struct flk_callback *, cred_t *,	\
859 				caller_context_t *);			\
860 	int	(*vop_space)(vnode_t *, int, struct flock64 *,		\
861 				int, offset_t,				\
862 				cred_t *, caller_context_t *);		\
863 	int	(*vop_realvp)(vnode_t *, vnode_t **,			\
864 				caller_context_t *);			\
865 	int	(*vop_getpage)(vnode_t *, offset_t, size_t, uint_t *,	\
866 				struct page **, size_t, struct seg *,	\
867 				caddr_t, enum seg_rw, cred_t *,		\
868 				caller_context_t *);			\
869 	int	(*vop_putpage)(vnode_t *, offset_t, size_t,		\
870 				int, cred_t *, caller_context_t *);	\
871 	int	(*vop_map)(vnode_t *, offset_t, struct as *,		\
872 				caddr_t *, size_t,			\
873 				uchar_t, uchar_t, uint_t, cred_t *,	\
874 				caller_context_t *);			\
875 	int	(*vop_addmap)(vnode_t *, offset_t, struct as *,		\
876 				caddr_t, size_t,			\
877 				uchar_t, uchar_t, uint_t, cred_t *,	\
878 				caller_context_t *);			\
879 	int	(*vop_delmap)(vnode_t *, offset_t, struct as *,		\
880 				caddr_t, size_t,			\
881 				uint_t, uint_t, uint_t, cred_t *,	\
882 				caller_context_t *);			\
883 	int	(*vop_poll)(vnode_t *, short, int, short *,		\
884 				struct pollhead **,			\
885 				caller_context_t *);			\
886 	int	(*vop_dump)(vnode_t *, caddr_t, offset_t, offset_t,	\
887 				caller_context_t *);			\
888 	int	(*vop_pathconf)(vnode_t *, int, ulong_t *, cred_t *,	\
889 				caller_context_t *);			\
890 	int	(*vop_pageio)(vnode_t *, struct page *,			\
891 				u_offset_t, size_t, int, cred_t *,	\
892 				caller_context_t *);			\
893 	int	(*vop_dumpctl)(vnode_t *, int, offset_t *,		\
894 				caller_context_t *);			\
895 	void	(*vop_dispose)(vnode_t *, struct page *,		\
896 				int, int, cred_t *,			\
897 				caller_context_t *);			\
898 	int	(*vop_setsecattr)(vnode_t *, vsecattr_t *,		\
899 				int, cred_t *, caller_context_t *);	\
900 	int	(*vop_getsecattr)(vnode_t *, vsecattr_t *,		\
901 				int, cred_t *, caller_context_t *);	\
902 	int	(*vop_shrlock)(vnode_t *, int, struct shrlock *,	\
903 				int, cred_t *, caller_context_t *);	\
904 	int	(*vop_vnevent)(vnode_t *, vnevent_t, vnode_t *,		\
905 				char *, caller_context_t *);		\
906 	int	(*vop_reqzcbuf)(vnode_t *, enum uio_rw, xuio_t *,	\
907 				cred_t *, caller_context_t *);		\
908 	int	(*vop_retzcbuf)(vnode_t *, xuio_t *, cred_t *,		\
909 				caller_context_t *)
910 	/* NB: No ";" */
911 
912 /*
913  * Operations on vnodes.  Note: File systems must never operate directly
914  * on a 'vnodeops' structure -- it WILL change in future releases!  They
915  * must use vn_make_ops() to create the structure.
916  */
917 typedef struct vnodeops {
918 	const char *vnop_name;
919 	VNODE_OPS;	/* Signatures of all vnode operations (vops) */
920 } vnodeops_t;
921 
922 typedef int (*fs_generic_func_p) ();	/* Generic vop/vfsop/femop/fsemop ptr */
923 
924 extern int	fop_open(vnode_t **, int, cred_t *, caller_context_t *);
925 extern int	fop_close(vnode_t *, int, int, offset_t, cred_t *,
926 				caller_context_t *);
927 extern int	fop_read(vnode_t *, uio_t *, int, cred_t *, caller_context_t *);
928 extern int	fop_write(vnode_t *, uio_t *, int, cred_t *,
929 				caller_context_t *);
930 extern int	fop_ioctl(vnode_t *, int, intptr_t, int, cred_t *, int *,
931 				caller_context_t *);
932 extern int	fop_setfl(vnode_t *, int, int, cred_t *, caller_context_t *);
933 extern int	fop_getattr(vnode_t *, vattr_t *, int, cred_t *,
934 				caller_context_t *);
935 extern int	fop_setattr(vnode_t *, vattr_t *, int, cred_t *,
936 				caller_context_t *);
937 extern int	fop_access(vnode_t *, int, int, cred_t *, caller_context_t *);
938 extern int	fop_lookup(vnode_t *, char *, vnode_t **, struct pathname *,
939 				int, vnode_t *, cred_t *, caller_context_t *,
940 				int *, struct pathname *);
941 extern int	fop_create(vnode_t *, char *, vattr_t *, vcexcl_t, int,
942 				vnode_t **, cred_t *, int, caller_context_t *,
943 				vsecattr_t *);
944 extern int	fop_remove(vnode_t *vp, char *, cred_t *, caller_context_t *,
945 				int);
946 extern int	fop_link(vnode_t *, vnode_t *, char *, cred_t *,
947 				caller_context_t *, int);
948 extern int	fop_rename(vnode_t *, char *, vnode_t *, char *, cred_t *,
949 				caller_context_t *, int);
950 extern int	fop_mkdir(vnode_t *, char *, vattr_t *, vnode_t **, cred_t *,
951 				caller_context_t *, int, vsecattr_t *);
952 extern int	fop_rmdir(vnode_t *, char *, vnode_t *, cred_t *,
953 				caller_context_t *, int);
954 extern int	fop_readdir(vnode_t *, uio_t *, cred_t *, int *,
955 				caller_context_t *, int);
956 extern int	fop_symlink(vnode_t *, char *, vattr_t *, char *, cred_t *,
957 				caller_context_t *, int);
958 extern int	fop_readlink(vnode_t *, uio_t *, cred_t *, caller_context_t *);
959 extern int	fop_fsync(vnode_t *, int, cred_t *, caller_context_t *);
960 extern void	fop_inactive(vnode_t *, cred_t *, caller_context_t *);
961 extern int	fop_fid(vnode_t *, struct fid *, caller_context_t *);
962 extern int	fop_rwlock(vnode_t *, int, caller_context_t *);
963 extern void	fop_rwunlock(vnode_t *, int, caller_context_t *);
964 extern int	fop_seek(vnode_t *, offset_t, offset_t *, caller_context_t *);
965 extern int	fop_cmp(vnode_t *, vnode_t *, caller_context_t *);
966 extern int	fop_frlock(vnode_t *, int, struct flock64 *, int, offset_t,
967 				struct flk_callback *, cred_t *,
968 				caller_context_t *);
969 extern int	fop_space(vnode_t *, int, struct flock64 *, int, offset_t,
970 				cred_t *, caller_context_t *);
971 extern int	fop_realvp(vnode_t *, vnode_t **, caller_context_t *);
972 extern int	fop_getpage(vnode_t *, offset_t, size_t, uint_t *,
973 				struct page **, size_t, struct seg *,
974 				caddr_t, enum seg_rw, cred_t *,
975 				caller_context_t *);
976 extern int	fop_putpage(vnode_t *, offset_t, size_t, int, cred_t *,
977 				caller_context_t *);
978 extern int	fop_map(vnode_t *, offset_t, struct as *, caddr_t *, size_t,
979 				uchar_t, uchar_t, uint_t, cred_t *cr,
980 				caller_context_t *);
981 extern int	fop_addmap(vnode_t *, offset_t, struct as *, caddr_t, size_t,
982 				uchar_t, uchar_t, uint_t, cred_t *,
983 				caller_context_t *);
984 extern int	fop_delmap(vnode_t *, offset_t, struct as *, caddr_t, size_t,
985 				uint_t, uint_t, uint_t, cred_t *,
986 				caller_context_t *);
987 extern int	fop_poll(vnode_t *, short, int, short *, struct pollhead **,
988 				caller_context_t *);
989 extern int	fop_dump(vnode_t *, caddr_t, offset_t, offset_t,
990     caller_context_t *);
991 extern int	fop_pathconf(vnode_t *, int, ulong_t *, cred_t *,
992 				caller_context_t *);
993 extern int	fop_pageio(vnode_t *, struct page *, u_offset_t, size_t, int,
994 				cred_t *, caller_context_t *);
995 extern int	fop_dumpctl(vnode_t *, int, offset_t *, caller_context_t *);
996 extern void	fop_dispose(vnode_t *, struct page *, int, int, cred_t *,
997 				caller_context_t *);
998 extern int	fop_setsecattr(vnode_t *, vsecattr_t *, int, cred_t *,
999 				caller_context_t *);
1000 extern int	fop_getsecattr(vnode_t *, vsecattr_t *, int, cred_t *,
1001 				caller_context_t *);
1002 extern int	fop_shrlock(vnode_t *, int, struct shrlock *, int, cred_t *,
1003 				caller_context_t *);
1004 extern int	fop_vnevent(vnode_t *, vnevent_t, vnode_t *, char *,
1005 				caller_context_t *);
1006 extern int	fop_reqzcbuf(vnode_t *, enum uio_rw, xuio_t *, cred_t *,
1007 				caller_context_t *);
1008 extern int	fop_retzcbuf(vnode_t *, xuio_t *, cred_t *, caller_context_t *);
1009 
1010 #endif	/* _KERNEL */
1011 
1012 #define	VOP_OPEN(vpp, mode, cr, ct) \
1013 	fop_open(vpp, mode, cr, ct)
1014 #define	VOP_CLOSE(vp, f, c, o, cr, ct) \
1015 	fop_close(vp, f, c, o, cr, ct)
1016 #define	VOP_READ(vp, uiop, iof, cr, ct) \
1017 	fop_read(vp, uiop, iof, cr, ct)
1018 #define	VOP_WRITE(vp, uiop, iof, cr, ct) \
1019 	fop_write(vp, uiop, iof, cr, ct)
1020 #define	VOP_IOCTL(vp, cmd, a, f, cr, rvp, ct) \
1021 	fop_ioctl(vp, cmd, a, f, cr, rvp, ct)
1022 #define	VOP_SETFL(vp, f, a, cr, ct) \
1023 	fop_setfl(vp, f, a, cr, ct)
1024 #define	VOP_GETATTR(vp, vap, f, cr, ct) \
1025 	fop_getattr(vp, vap, f, cr, ct)
1026 #define	VOP_SETATTR(vp, vap, f, cr, ct) \
1027 	fop_setattr(vp, vap, f, cr, ct)
1028 #define	VOP_ACCESS(vp, mode, f, cr, ct) \
1029 	fop_access(vp, mode, f, cr, ct)
1030 #define	VOP_LOOKUP(vp, cp, vpp, pnp, f, rdir, cr, ct, defp, rpnp) \
1031 	fop_lookup(vp, cp, vpp, pnp, f, rdir, cr, ct, defp, rpnp)
1032 #define	VOP_CREATE(dvp, p, vap, ex, mode, vpp, cr, flag, ct, vsap) \
1033 	fop_create(dvp, p, vap, ex, mode, vpp, cr, flag, ct, vsap)
1034 #define	VOP_REMOVE(dvp, p, cr, ct, f) \
1035 	fop_remove(dvp, p, cr, ct, f)
1036 #define	VOP_LINK(tdvp, fvp, p, cr, ct, f) \
1037 	fop_link(tdvp, fvp, p, cr, ct, f)
1038 #define	VOP_RENAME(fvp, fnm, tdvp, tnm, cr, ct, f) \
1039 	fop_rename(fvp, fnm, tdvp, tnm, cr, ct, f)
1040 #define	VOP_MKDIR(dp, p, vap, vpp, cr, ct, f, vsap) \
1041 	fop_mkdir(dp, p, vap, vpp, cr, ct, f, vsap)
1042 #define	VOP_RMDIR(dp, p, cdir, cr, ct, f) \
1043 	fop_rmdir(dp, p, cdir, cr, ct, f)
1044 #define	VOP_READDIR(vp, uiop, cr, eofp, ct, f) \
1045 	fop_readdir(vp, uiop, cr, eofp, ct, f)
1046 #define	VOP_SYMLINK(dvp, lnm, vap, tnm, cr, ct, f) \
1047 	fop_symlink(dvp, lnm, vap, tnm, cr, ct, f)
1048 #define	VOP_READLINK(vp, uiop, cr, ct) \
1049 	fop_readlink(vp, uiop, cr, ct)
1050 #define	VOP_FSYNC(vp, syncflag, cr, ct) \
1051 	fop_fsync(vp, syncflag, cr, ct)
1052 #define	VOP_INACTIVE(vp, cr, ct) \
1053 	fop_inactive(vp, cr, ct)
1054 #define	VOP_FID(vp, fidp, ct) \
1055 	fop_fid(vp, fidp, ct)
1056 #define	VOP_RWLOCK(vp, w, ct) \
1057 	fop_rwlock(vp, w, ct)
1058 #define	VOP_RWUNLOCK(vp, w, ct) \
1059 	fop_rwunlock(vp, w, ct)
1060 #define	VOP_SEEK(vp, ooff, noffp, ct) \
1061 	fop_seek(vp, ooff, noffp, ct)
1062 #define	VOP_CMP(vp1, vp2, ct) \
1063 	fop_cmp(vp1, vp2, ct)
1064 #define	VOP_FRLOCK(vp, cmd, a, f, o, cb, cr, ct) \
1065 	fop_frlock(vp, cmd, a, f, o, cb, cr, ct)
1066 #define	VOP_SPACE(vp, cmd, a, f, o, cr, ct) \
1067 	fop_space(vp, cmd, a, f, o, cr, ct)
1068 #define	VOP_REALVP(vp1, vp2, ct) \
1069 	fop_realvp(vp1, vp2, ct)
1070 #define	VOP_GETPAGE(vp, of, sz, pr, pl, ps, sg, a, rw, cr, ct) \
1071 	fop_getpage(vp, of, sz, pr, pl, ps, sg, a, rw, cr, ct)
1072 #define	VOP_PUTPAGE(vp, of, sz, fl, cr, ct) \
1073 	fop_putpage(vp, of, sz, fl, cr, ct)
1074 #define	VOP_MAP(vp, of, as, a, sz, p, mp, fl, cr, ct) \
1075 	fop_map(vp, of, as, a, sz, p, mp, fl, cr, ct)
1076 #define	VOP_ADDMAP(vp, of, as, a, sz, p, mp, fl, cr, ct) \
1077 	fop_addmap(vp, of, as, a, sz, p, mp, fl, cr, ct)
1078 #define	VOP_DELMAP(vp, of, as, a, sz, p, mp, fl, cr, ct) \
1079 	fop_delmap(vp, of, as, a, sz, p, mp, fl, cr, ct)
1080 #define	VOP_POLL(vp, events, anyyet, reventsp, phpp, ct) \
1081 	fop_poll(vp, events, anyyet, reventsp, phpp, ct)
1082 #define	VOP_DUMP(vp, addr, bn, count, ct) \
1083 	fop_dump(vp, addr, bn, count, ct)
1084 #define	VOP_PATHCONF(vp, cmd, valp, cr, ct) \
1085 	fop_pathconf(vp, cmd, valp, cr, ct)
1086 #define	VOP_PAGEIO(vp, pp, io_off, io_len, flags, cr, ct) \
1087 	fop_pageio(vp, pp, io_off, io_len, flags, cr, ct)
1088 #define	VOP_DUMPCTL(vp, action, blkp, ct) \
1089 	fop_dumpctl(vp, action, blkp, ct)
1090 #define	VOP_DISPOSE(vp, pp, flag, dn, cr, ct) \
1091 	fop_dispose(vp, pp, flag, dn, cr, ct)
1092 #define	VOP_GETSECATTR(vp, vsap, f, cr, ct) \
1093 	fop_getsecattr(vp, vsap, f, cr, ct)
1094 #define	VOP_SETSECATTR(vp, vsap, f, cr, ct) \
1095 	fop_setsecattr(vp, vsap, f, cr, ct)
1096 #define	VOP_SHRLOCK(vp, cmd, shr, f, cr, ct) \
1097 	fop_shrlock(vp, cmd, shr, f, cr, ct)
1098 #define	VOP_VNEVENT(vp, vnevent, dvp, fnm, ct) \
1099 	fop_vnevent(vp, vnevent, dvp, fnm, ct)
1100 #define	VOP_REQZCBUF(vp, rwflag, xuiop, cr, ct) \
1101 	fop_reqzcbuf(vp, rwflag, xuiop, cr, ct)
1102 #define	VOP_RETZCBUF(vp, xuiop, cr, ct) \
1103 	fop_retzcbuf(vp, xuiop, cr, ct)
1104 
1105 #define	VOPNAME_OPEN		"open"
1106 #define	VOPNAME_CLOSE		"close"
1107 #define	VOPNAME_READ		"read"
1108 #define	VOPNAME_WRITE		"write"
1109 #define	VOPNAME_IOCTL		"ioctl"
1110 #define	VOPNAME_SETFL		"setfl"
1111 #define	VOPNAME_GETATTR		"getattr"
1112 #define	VOPNAME_SETATTR		"setattr"
1113 #define	VOPNAME_ACCESS		"access"
1114 #define	VOPNAME_LOOKUP		"lookup"
1115 #define	VOPNAME_CREATE		"create"
1116 #define	VOPNAME_REMOVE		"remove"
1117 #define	VOPNAME_LINK		"link"
1118 #define	VOPNAME_RENAME		"rename"
1119 #define	VOPNAME_MKDIR		"mkdir"
1120 #define	VOPNAME_RMDIR		"rmdir"
1121 #define	VOPNAME_READDIR		"readdir"
1122 #define	VOPNAME_SYMLINK		"symlink"
1123 #define	VOPNAME_READLINK	"readlink"
1124 #define	VOPNAME_FSYNC		"fsync"
1125 #define	VOPNAME_INACTIVE	"inactive"
1126 #define	VOPNAME_FID		"fid"
1127 #define	VOPNAME_RWLOCK		"rwlock"
1128 #define	VOPNAME_RWUNLOCK	"rwunlock"
1129 #define	VOPNAME_SEEK		"seek"
1130 #define	VOPNAME_CMP		"cmp"
1131 #define	VOPNAME_FRLOCK		"frlock"
1132 #define	VOPNAME_SPACE		"space"
1133 #define	VOPNAME_REALVP		"realvp"
1134 #define	VOPNAME_GETPAGE		"getpage"
1135 #define	VOPNAME_PUTPAGE		"putpage"
1136 #define	VOPNAME_MAP		"map"
1137 #define	VOPNAME_ADDMAP		"addmap"
1138 #define	VOPNAME_DELMAP		"delmap"
1139 #define	VOPNAME_POLL		"poll"
1140 #define	VOPNAME_DUMP		"dump"
1141 #define	VOPNAME_PATHCONF	"pathconf"
1142 #define	VOPNAME_PAGEIO		"pageio"
1143 #define	VOPNAME_DUMPCTL		"dumpctl"
1144 #define	VOPNAME_DISPOSE		"dispose"
1145 #define	VOPNAME_GETSECATTR	"getsecattr"
1146 #define	VOPNAME_SETSECATTR	"setsecattr"
1147 #define	VOPNAME_SHRLOCK		"shrlock"
1148 #define	VOPNAME_VNEVENT		"vnevent"
1149 #define	VOPNAME_REQZCBUF	"reqzcbuf"
1150 #define	VOPNAME_RETZCBUF	"retzcbuf"
1151 
1152 /*
1153  * Flags for VOP_LOOKUP
1154  *
1155  * Defined in file.h, but also possible, FIGNORECASE
1156  *
1157  */
1158 #define	LOOKUP_DIR		0x01	/* want parent dir vp */
1159 #define	LOOKUP_XATTR		0x02	/* lookup up extended attr dir */
1160 #define	CREATE_XATTR_DIR	0x04	/* Create extended attr dir */
1161 #define	LOOKUP_HAVE_SYSATTR_DIR	0x08	/* Already created virtual GFS dir */
1162 
1163 /*
1164  * Flags for VOP_READDIR
1165  */
1166 #define	V_RDDIR_ENTFLAGS	0x01	/* request dirent flags */
1167 #define	V_RDDIR_ACCFILTER	0x02	/* filter out inaccessible dirents */
1168 
1169 /*
1170  * Flags for VOP_RWLOCK/VOP_RWUNLOCK
1171  * VOP_RWLOCK will return the flag that was actually set, or -1 if none.
1172  */
1173 #define	V_WRITELOCK_TRUE	(1)	/* Request write-lock on the vnode */
1174 #define	V_WRITELOCK_FALSE	(0)	/* Request read-lock on the vnode */
1175 
1176 /*
1177  * Flags for VOP_DUMPCTL
1178  */
1179 #define	DUMP_ALLOC	0
1180 #define	DUMP_FREE	1
1181 #define	DUMP_SCAN	2
1182 
1183 /*
1184  * Public vnode manipulation functions.
1185  */
1186 #ifdef	_KERNEL
1187 
1188 vnode_t *vn_alloc(int);
1189 void	vn_reinit(vnode_t *);
1190 void	vn_recycle(vnode_t *);
1191 void	vn_free(vnode_t *);
1192 
1193 int	vn_is_readonly(vnode_t *);
1194 int   	vn_is_opened(vnode_t *, v_mode_t);
1195 int   	vn_is_mapped(vnode_t *, v_mode_t);
1196 int   	vn_has_other_opens(vnode_t *, v_mode_t);
1197 void	vn_open_upgrade(vnode_t *, int);
1198 void	vn_open_downgrade(vnode_t *, int);
1199 
1200 int	vn_can_change_zones(vnode_t *vp);
1201 
1202 int	vn_has_flocks(vnode_t *);
1203 int	vn_has_mandatory_locks(vnode_t *, int);
1204 int	vn_has_cached_data(vnode_t *);
1205 
1206 void	vn_setops(vnode_t *, vnodeops_t *);
1207 vnodeops_t *vn_getops(vnode_t *);
1208 int	vn_matchops(vnode_t *, vnodeops_t *);
1209 int	vn_matchopval(vnode_t *, char *, fs_generic_func_p);
1210 int	vn_ismntpt(vnode_t *);
1211 
1212 struct vfs *vn_mountedvfs(vnode_t *);
1213 
1214 int	vn_in_dnlc(vnode_t *);
1215 
1216 void	vn_create_cache(void);
1217 void	vn_destroy_cache(void);
1218 
1219 void	vn_freevnodeops(vnodeops_t *);
1220 
1221 int	vn_open(char *pnamep, enum uio_seg seg, int filemode, int createmode,
1222 		struct vnode **vpp, enum create crwhy, mode_t umask);
1223 int	vn_openat(char *pnamep, enum uio_seg seg, int filemode, int createmode,
1224 		struct vnode **vpp, enum create crwhy,
1225 		mode_t umask, struct vnode *startvp, int fd);
1226 int	vn_create(char *pnamep, enum uio_seg seg, struct vattr *vap,
1227 		enum vcexcl excl, int mode, struct vnode **vpp,
1228 		enum create why, int flag, mode_t umask);
1229 int	vn_createat(char *pnamep, enum uio_seg seg, struct vattr *vap,
1230 		enum vcexcl excl, int mode, struct vnode **vpp,
1231 		enum create why, int flag, mode_t umask, struct vnode *startvp);
1232 int	vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, ssize_t len,
1233 		offset_t offset, enum uio_seg seg, int ioflag, rlim64_t ulimit,
1234 		cred_t *cr, ssize_t *residp);
1235 void	vn_rele(struct vnode *vp);
1236 void	vn_rele_async(struct vnode *vp, struct taskq *taskq);
1237 void	vn_rele_dnlc(struct vnode *vp);
1238 void	vn_rele_stream(struct vnode *vp);
1239 int	vn_link(char *from, char *to, enum uio_seg seg);
1240 int	vn_rename(char *from, char *to, enum uio_seg seg);
1241 int	vn_renameat(vnode_t *fdvp, char *fname, vnode_t *tdvp, char *tname,
1242 		enum uio_seg seg);
1243 int	vn_remove(char *fnamep, enum uio_seg seg, enum rm dirflag);
1244 int	vn_removeat(vnode_t *startvp, char *fnamep, enum uio_seg seg,
1245 		enum rm dirflag);
1246 int	vn_compare(vnode_t *vp1, vnode_t *vp2);
1247 int	vn_vfswlock(struct vnode *vp);
1248 int	vn_vfswlock_wait(struct vnode *vp);
1249 int	vn_vfsrlock(struct vnode *vp);
1250 int	vn_vfsrlock_wait(struct vnode *vp);
1251 void	vn_vfsunlock(struct vnode *vp);
1252 int	vn_vfswlock_held(struct vnode *vp);
1253 vnode_t *specvp(struct vnode *vp, dev_t dev, vtype_t type, struct cred *cr);
1254 vnode_t *makespecvp(dev_t dev, vtype_t type);
1255 vn_vfslocks_entry_t *vn_vfslocks_getlock(void *);
1256 void	vn_vfslocks_rele(vn_vfslocks_entry_t *);
1257 boolean_t vn_is_reparse(vnode_t *, cred_t *, caller_context_t *);
1258 
1259 void vn_copypath(struct vnode *src, struct vnode *dst);
1260 void vn_setpath_str(struct vnode *vp, const char *str, size_t len);
1261 void vn_setpath(vnode_t *rootvp, struct vnode *startvp, struct vnode *vp,
1262     const char *path, size_t plen);
1263 void vn_renamepath(vnode_t *dvp, vnode_t *vp, const char *nm, size_t len);
1264 
1265 /* Vnode event notification */
1266 void	vnevent_rename_src(vnode_t *, vnode_t *, char *, caller_context_t *);
1267 void	vnevent_rename_dest(vnode_t *, vnode_t *, char *, caller_context_t *);
1268 void	vnevent_remove(vnode_t *, vnode_t *, char *, caller_context_t *);
1269 void	vnevent_rmdir(vnode_t *, vnode_t *, char *, caller_context_t *);
1270 void	vnevent_create(vnode_t *, caller_context_t *);
1271 void	vnevent_link(vnode_t *, caller_context_t *);
1272 void	vnevent_rename_dest_dir(vnode_t *, caller_context_t *ct);
1273 void	vnevent_mountedover(vnode_t *, caller_context_t *);
1274 int	vnevent_support(vnode_t *, caller_context_t *);
1275 
1276 /* Vnode specific data */
1277 void vsd_create(uint_t *, void (*)(void *));
1278 void vsd_destroy(uint_t *);
1279 void *vsd_get(vnode_t *, uint_t);
1280 int vsd_set(vnode_t *, uint_t, void *);
1281 void vsd_free(vnode_t *);
1282 
1283 /*
1284  * Extensible vnode attribute (xva) routines:
1285  * xva_init() initializes an xvattr_t (zero struct, init mapsize, set AT_XATTR)
1286  * xva_getxoptattr() returns a ponter to the xoptattr_t section of xvattr_t
1287  */
1288 void		xva_init(xvattr_t *);
1289 xoptattr_t	*xva_getxoptattr(xvattr_t *);	/* Get ptr to xoptattr_t */
1290 
1291 void xattr_init(void);		/* Initialize vnodeops for xattrs */
1292 
1293 /* GFS tunnel for xattrs */
1294 int xattr_dir_lookup(vnode_t *, vnode_t **, int, cred_t *);
1295 
1296 /* Reparse Point */
1297 void reparse_point_init(void);
1298 
1299 /* Context identification */
1300 u_longlong_t	fs_new_caller_id();
1301 
1302 int	vn_vmpss_usepageio(vnode_t *);
1303 
1304 /*
1305  * Needed for use of IS_VMODSORT() in kernel.
1306  */
1307 extern uint_t pvn_vmodsort_supported;
1308 
1309 #define	VN_HOLD(vp)	{ \
1310 	mutex_enter(&(vp)->v_lock); \
1311 	(vp)->v_count++; \
1312 	mutex_exit(&(vp)->v_lock); \
1313 }
1314 
1315 #define	VN_RELE(vp)	{ \
1316 	vn_rele(vp); \
1317 }
1318 
1319 #define	VN_RELE_ASYNC(vp, taskq)	{ \
1320 	vn_rele_async(vp, taskq); \
1321 }
1322 
1323 #define	VN_SET_VFS_TYPE_DEV(vp, vfsp, type, dev)	{ \
1324 	(vp)->v_vfsp = (vfsp); \
1325 	(vp)->v_type = (type); \
1326 	(vp)->v_rdev = (dev); \
1327 }
1328 
1329 /*
1330  * Compare two vnodes for equality.  In general this macro should be used
1331  * in preference to calling VOP_CMP directly.
1332  */
1333 #define	VN_CMP(VP1, VP2)	((VP1) == (VP2) ? 1 : 	\
1334 	((VP1) && (VP2) && (vn_getops(VP1) == vn_getops(VP2)) ? \
1335 	VOP_CMP(VP1, VP2, NULL) : 0))
1336 
1337 /*
1338  * Some well-known global vnodes used by the VM system to name pages.
1339  */
1340 extern struct vnode kvps[];
1341 
1342 typedef enum {
1343 	KV_KVP,		/* vnode for all segkmem pages */
1344 	KV_ZVP,		/* vnode for all ZFS pages */
1345 #if defined(__sparc)
1346 	KV_MPVP,	/* vnode for all page_t meta-pages */
1347 	KV_PROMVP,	/* vnode for all PROM pages */
1348 #endif	/* __sparc */
1349 	KV_MAX		/* total number of vnodes in kvps[] */
1350 } kvps_index_t;
1351 
1352 #define	VN_ISKAS(vp)	((vp) >= &kvps[0] && (vp) < &kvps[KV_MAX])
1353 
1354 #endif	/* _KERNEL */
1355 
1356 /*
1357  * Flags to VOP_SETATTR/VOP_GETATTR.
1358  */
1359 #define	ATTR_UTIME	0x01	/* non-default utime(2) request */
1360 #define	ATTR_EXEC	0x02	/* invocation from exec(2) */
1361 #define	ATTR_COMM	0x04	/* yield common vp attributes */
1362 #define	ATTR_HINT	0x08	/* information returned will be `hint' */
1363 #define	ATTR_REAL	0x10	/* yield attributes of the real vp */
1364 #define	ATTR_NOACLCHECK	0x20	/* Don't check ACL when checking permissions */
1365 #define	ATTR_TRIGGER	0x40	/* Mount first if vnode is a trigger mount */
1366 /*
1367  * Generally useful macros.
1368  */
1369 #define	VBSIZE(vp)	((vp)->v_vfsp->vfs_bsize)
1370 
1371 #define	VTOZONE(vp)	((vp)->v_vfsp->vfs_zone)
1372 
1373 #define	NULLVP		((struct vnode *)0)
1374 #define	NULLVPP		((struct vnode **)0)
1375 
1376 #ifdef	_KERNEL
1377 
1378 /*
1379  * Structure used while handling asynchronous VOP_PUTPAGE operations.
1380  */
1381 struct async_reqs {
1382 	struct async_reqs *a_next;	/* pointer to next arg struct */
1383 	struct vnode *a_vp;		/* vnode pointer */
1384 	u_offset_t a_off;			/* offset in file */
1385 	uint_t a_len;			/* size of i/o request */
1386 	int a_flags;			/* flags to indicate operation type */
1387 	struct cred *a_cred;		/* cred pointer	*/
1388 	ushort_t a_prealloced;		/* set if struct is pre-allocated */
1389 };
1390 
1391 /*
1392  * VN_DISPOSE() -- given a page pointer, safely invoke VOP_DISPOSE().
1393  * Note that there is no guarantee that the page passed in will be
1394  * freed.  If that is required, then a check after calling VN_DISPOSE would
1395  * be necessary to ensure the page was freed.
1396  */
1397 #define	VN_DISPOSE(pp, flag, dn, cr)	{ \
1398 	if ((pp)->p_vnode != NULL && !VN_ISKAS((pp)->p_vnode)) \
1399 		VOP_DISPOSE((pp)->p_vnode, (pp), (flag), (dn), (cr), NULL); \
1400 	else if ((flag) == B_FREE) \
1401 		page_free((pp), (dn)); \
1402 	else \
1403 		page_destroy((pp), (dn)); \
1404 	}
1405 
1406 #endif	/* _KERNEL */
1407 
1408 #ifdef	__cplusplus
1409 }
1410 #endif
1411 
1412 #endif	/* _SYS_VNODE_H */
1413