xref: /titanic_52/usr/src/uts/common/sys/vfs.h (revision a29e56d91db891741f1af9f6bbd3e3c3cac5f19b)
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 /*
23  * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
24  * Copyright 2016 Nexenta Systems, Inc.
25  * Copyright 2016 Toomas Soome <tsoome@me.com>
26  */
27 
28 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
29 /*	  All Rights Reserved  	*/
30 
31 /*
32  * Portions of this source code were derived from Berkeley 4.3 BSD
33  * under license from the Regents of the University of California.
34  */
35 
36 #ifndef _SYS_VFS_H
37 #define	_SYS_VFS_H
38 
39 #include <sys/zone.h>
40 #include <sys/types.h>
41 #include <sys/t_lock.h>
42 #include <sys/cred.h>
43 #include <sys/vnode.h>
44 #include <sys/statvfs.h>
45 #include <sys/refstr.h>
46 #include <sys/avl.h>
47 #include <sys/time.h>
48 
49 #ifdef	__cplusplus
50 extern "C" {
51 #endif
52 
53 /*
54  * Data associated with mounted file systems.
55  */
56 
57 /*
58  * Operations vector.  This is used internal to the kernel; file systems
59  * supply their list of operations via vfs_setfsops().
60  */
61 
62 typedef struct vfsops vfsops_t;
63 
64 /*
65  * File system identifier. Should be unique (at least per machine).
66  */
67 typedef struct {
68 	int val[2];			/* file system id type */
69 } fsid_t;
70 
71 /*
72  * File identifier.  Should be unique per filesystem on a single
73  * machine.  This is typically called by a stateless file server
74  * in order to generate "file handles".
75  *
76  * Many underlying file systems cast a struct fid into other
77  * file system dependent structures which may require 4 byte alignment.
78  * Because a fid starts with a short it may not be 4 byte aligned, the
79  * fid_pad will force the alignment.
80  */
81 #define	MAXFIDSZ	64
82 #define	OLD_MAXFIDSZ	16
83 
84 typedef struct fid {
85 	union {
86 		long fid_pad;
87 		struct {
88 			ushort_t len;	/* length of data in bytes */
89 			char	data[MAXFIDSZ]; /* data (variable len) */
90 		} _fid;
91 	} un;
92 } fid_t;
93 
94 #ifdef _SYSCALL32
95 /*
96  * Solaris 64 - use old-style cache format with 32-bit aligned fid for on-disk
97  * struct compatibility.
98  */
99 typedef struct fid32 {
100 	union {
101 		int32_t fid_pad;
102 		struct {
103 			uint16_t  len;   /* length of data in bytes */
104 			char    data[MAXFIDSZ]; /* data (variable len) */
105 		} _fid;
106 	} un;
107 } fid32_t;
108 #else /* not _SYSCALL32 */
109 #define	fid32	fid
110 typedef fid_t	fid32_t;
111 #endif /* _SYSCALL32 */
112 
113 #define	fid_len		un._fid.len
114 #define	fid_data	un._fid.data
115 
116 /*
117  * Structure defining a mount option for a filesystem.
118  * option names are found in mntent.h
119  */
120 typedef struct mntopt {
121 	char	*mo_name;	/* option name */
122 	char	**mo_cancel;	/* list of options cancelled by this one */
123 	char	*mo_arg;	/* argument string for this option */
124 	int	mo_flags;	/* flags for this mount option */
125 	void	*mo_data;	/* filesystem specific data */
126 } mntopt_t;
127 
128 /*
129  * Flags that apply to mount options
130  */
131 
132 #define	MO_SET		0x01		/* option is set */
133 #define	MO_NODISPLAY	0x02		/* option not listed in mnttab */
134 #define	MO_HASVALUE	0x04		/* option takes a value */
135 #define	MO_IGNORE	0x08		/* option ignored by parser */
136 #define	MO_DEFAULT	MO_SET		/* option is on by default */
137 #define	MO_TAG		0x10		/* flags a tag set by user program */
138 #define	MO_EMPTY	0x20		/* empty space in option table */
139 
140 #define	VFS_NOFORCEOPT	0x01		/* honor MO_IGNORE (don't set option) */
141 #define	VFS_DISPLAY	0x02		/* Turn off MO_NODISPLAY bit for opt */
142 #define	VFS_NODISPLAY	0x04		/* Turn on MO_NODISPLAY bit for opt */
143 #define	VFS_CREATEOPT	0x08		/* Create the opt if it's not there */
144 
145 /*
146  * Structure holding mount option strings for the mounted file system.
147  */
148 typedef struct mntopts {
149 	uint_t		mo_count;		/* number of entries in table */
150 	mntopt_t	*mo_list;		/* list of mount options */
151 } mntopts_t;
152 
153 /*
154  * The kstat structures associated with the vopstats are kept in an
155  * AVL tree.  This is to avoid the case where a file system does not
156  * use a unique fsid_t for each vfs (e.g., namefs).  In order to do
157  * this, we need a structure that the AVL tree can use that also
158  * references the kstat.
159  * Note that the vks_fsid is generated from the value reported by
160  * VFS_STATVFS().
161  */
162 typedef struct vskstat_anchor {
163 	avl_node_t	vsk_node;	/* Required for use by AVL routines */
164 	kstat_t		*vsk_ksp;	/* kstat structure for vopstats */
165 	ulong_t		vsk_fsid;	/* fsid associated w/this FS */
166 } vsk_anchor_t;
167 
168 extern avl_tree_t	vskstat_tree;
169 extern kmutex_t		vskstat_tree_lock;
170 
171 /*
172  * Structure per mounted file system.  Each mounted file system has
173  * an array of operations and an instance record.
174  *
175  * The file systems are kept on a doubly linked circular list headed by
176  * "rootvfs".
177  * File system implementations should not access this list;
178  * it's intended for use only in the kernel's vfs layer.
179  *
180  * Each zone also has its own list of mounts, containing filesystems mounted
181  * somewhere within the filesystem tree rooted at the zone's rootpath.  The
182  * list is doubly linked to match the global list.
183  *
184  * mnttab locking: the in-kernel mnttab uses the vfs_mntpt, vfs_resource and
185  * vfs_mntopts fields in the vfs_t. mntpt and resource are refstr_ts that
186  * are set at mount time and can only be modified during a remount.
187  * It is safe to read these fields if you can prevent a remount on the vfs,
188  * or through the convenience funcs vfs_getmntpoint() and vfs_getresource().
189  * The mntopts field may only be accessed through the provided convenience
190  * functions, as it is protected by the vfs list lock. Modifying a mount
191  * option requires grabbing the vfs list write lock, which can be a very
192  * high latency lock.
193  */
194 struct zone;		/* from zone.h */
195 struct fem_head;	/* from fem.h */
196 
197 typedef struct vfs {
198 	struct vfs	*vfs_next;		/* next VFS in VFS list */
199 	struct vfs	*vfs_prev;		/* prev VFS in VFS list */
200 	avl_node_t	vfs_avldev;		/* by dev index */
201 	avl_node_t	vfs_avlmntpnt;		/* by mntpnt index */
202 	/*
203 	 * global mount count to define an order on entries in
204 	 * the avl trees with same dev/mountpoint
205 	 */
206 	uint64_t	vfs_mntix;
207 
208 /* vfs_op should not be used directly.  Accessor functions are provided */
209 	vfsops_t	*vfs_op;		/* operations on VFS */
210 
211 	struct vnode	*vfs_vnodecovered;	/* vnode mounted on */
212 	uint_t		vfs_flag;		/* flags */
213 	uint_t		vfs_bsize;		/* native block size */
214 	int		vfs_fstype;		/* file system type index */
215 	fsid_t		vfs_fsid;		/* file system id */
216 	void		*vfs_data;		/* private data */
217 	dev_t		vfs_dev;		/* device of mounted VFS */
218 	ulong_t		vfs_bcount;		/* I/O count (accounting) */
219 	struct vfs	*vfs_list;		/* sync list pointer */
220 	struct vfs	*vfs_hash;		/* hash list pointer */
221 	ksema_t		vfs_reflock;		/* mount/unmount/sync lock */
222 	uint_t		vfs_count;		/* vfs reference count */
223 	mntopts_t	vfs_mntopts;		/* options mounted with */
224 	refstr_t	*vfs_resource;		/* mounted resource name */
225 	refstr_t	*vfs_mntpt;		/* mount point name */
226 	time_t		vfs_mtime;		/* time we were mounted */
227 	struct vfs_impl	*vfs_implp;		/* impl specific data */
228 	/*
229 	 * Zones support.  Note that the zone that "owns" the mount isn't
230 	 * necessarily the same as the zone in which the zone is visible.
231 	 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to
232 	 * different zones.
233 	 */
234 	struct zone	*vfs_zone;		/* zone that owns the mount */
235 	struct vfs	*vfs_zone_next;		/* next VFS visible in zone */
236 	struct vfs	*vfs_zone_prev;		/* prev VFS visible in zone */
237 
238 	struct fem_head	*vfs_femhead;		/* fs monitoring */
239 	uint32_t	vfs_lofi_id;		/* ID if lofi mount */
240 } vfs_t;
241 
242 #define	vfs_featureset	vfs_implp->vi_featureset
243 #define	vfs_vskap	vfs_implp->vi_vskap
244 #define	vfs_fstypevsp	vfs_implp->vi_fstypevsp
245 #define	vfs_vopstats	vfs_implp->vi_vopstats
246 #define	vfs_hrctime	vfs_implp->vi_hrctime
247 
248 /*
249  * VFS flags.
250  */
251 #define	VFS_RDONLY	0x01		/* read-only vfs */
252 #define	VFS_NOMNTTAB	0x02		/* vfs not seen in mnttab */
253 #define	VFS_NOSETUID	0x08		/* setuid disallowed */
254 #define	VFS_REMOUNT	0x10		/* modify mount options only */
255 #define	VFS_NOTRUNC	0x20		/* does not truncate long file names */
256 #define	VFS_UNLINKABLE	0x40		/* unlink(2) can be applied to root */
257 #define	VFS_PXFS	0x80		/* clustering: global fs proxy vfs */
258 #define	VFS_UNMOUNTED	0x100		/* file system has been unmounted */
259 #define	VFS_NBMAND	0x200		/* allow non-blocking mandatory locks */
260 #define	VFS_XATTR	0x400		/* fs supports extended attributes */
261 #define	VFS_NODEVICES	0x800		/* device-special files disallowed */
262 #define	VFS_NOEXEC	0x1000		/* executables disallowed */
263 #define	VFS_STATS	0x2000		/* file system can collect stats */
264 #define	VFS_XID		0x4000		/* file system supports extended ids */
265 #define	VFS_NOFOLLOW	0x8000		/* never follow symlinks */
266 
267 #define	VFS_NORESOURCE	"unspecified_resource"
268 #define	VFS_NOMNTPT	"unspecified_mountpoint"
269 
270 /*
271  * VFS features are implemented as bits set in the vfs_t.
272  * The vfs_feature_t typedef is a 64-bit number that will translate
273  * into an element in an array of bitmaps and a bit in that element.
274  * Developers must not depend on the implementation of this and
275  * need to use vfs_has_feature()/vfs_set_feature() routines.
276  */
277 typedef	uint64_t	vfs_feature_t;
278 
279 #define	VFSFT_XVATTR		0x100000001	/* Supports xvattr for attrs */
280 #define	VFSFT_CASEINSENSITIVE	0x100000002	/* Supports case-insensitive */
281 #define	VFSFT_NOCASESENSITIVE	0x100000004	/* NOT case-sensitive */
282 #define	VFSFT_DIRENTFLAGS	0x100000008	/* Supports dirent flags */
283 #define	VFSFT_ACLONCREATE	0x100000010	/* Supports ACL on create */
284 #define	VFSFT_ACEMASKONACCESS	0x100000020	/* Can use ACEMASK for access */
285 #define	VFSFT_SYSATTR_VIEWS	0x100000040	/* Supports sysattr view i/f */
286 #define	VFSFT_ACCESS_FILTER	0x100000080	/* dirents filtered by access */
287 #define	VFSFT_REPARSE		0x100000100	/* Supports reparse point */
288 #define	VFSFT_ZEROCOPY_SUPPORTED	0x100000200
289 				/* Support loaning /returning cache buffer */
290 /*
291  * Argument structure for mount(2).
292  *
293  * Flags are defined in <sys/mount.h>.
294  *
295  * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in
296  * this structure are to be interpreted as kernel addresses.  File systems
297  * should be prepared for this possibility.
298  */
299 struct mounta {
300 	char	*spec;
301 	char	*dir;
302 	int	flags;
303 	char	*fstype;
304 	char	*dataptr;
305 	int	datalen;
306 	char	*optptr;
307 	int	optlen;
308 };
309 
310 /*
311  * Reasons for calling the vfs_mountroot() operation.
312  */
313 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT};
314 typedef enum whymountroot whymountroot_t;
315 
316 /*
317  * Reasons for calling the VFS_VNSTATE():
318  */
319 enum vntrans {
320 	VNTRANS_EXISTS,
321 	VNTRANS_IDLED,
322 	VNTRANS_RECLAIMED,
323 	VNTRANS_DESTROYED
324 };
325 typedef enum vntrans vntrans_t;
326 
327 /*
328  * VFS_OPS defines all the vfs operations.  It is used to define
329  * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h).
330  */
331 #define	VFS_OPS								\
332 	int	(*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \
333 	int	(*vfs_unmount)(vfs_t *, int, cred_t *);			\
334 	int	(*vfs_root)(vfs_t *, vnode_t **);			\
335 	int	(*vfs_statvfs)(vfs_t *, statvfs64_t *);			\
336 	int	(*vfs_sync)(vfs_t *, short, cred_t *);			\
337 	int	(*vfs_vget)(vfs_t *, vnode_t **, fid_t *);		\
338 	int	(*vfs_mountroot)(vfs_t *, enum whymountroot);		\
339 	void	(*vfs_freevfs)(vfs_t *);				\
340 	int	(*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t)	/* NB: No ";" */
341 
342 /*
343  * Operations supported on virtual file system.
344  */
345 struct vfsops {
346 	VFS_OPS;	/* Signature of all vfs operations (vfsops) */
347 };
348 
349 extern int	fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *);
350 extern int	fsop_unmount(vfs_t *, int, cred_t *);
351 extern int	fsop_root(vfs_t *, vnode_t **);
352 extern int	fsop_statfs(vfs_t *, statvfs64_t *);
353 extern int	fsop_sync(vfs_t *, short, cred_t *);
354 extern int	fsop_vget(vfs_t *, vnode_t **, fid_t *);
355 extern int	fsop_mountroot(vfs_t *, enum whymountroot);
356 extern void	fsop_freefs(vfs_t *);
357 extern int	fsop_sync_by_kind(int, short, cred_t *);
358 extern int	fsop_vnstate(vfs_t *, vnode_t *, vntrans_t);
359 
360 #define	VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr)
361 #define	VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr)
362 #define	VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp)
363 #define	VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp)
364 #define	VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr)
365 #define	VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp)
366 #define	VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init)
367 #define	VFS_FREEVFS(vfsp) fsop_freefs(vfsp)
368 #define	VFS_VNSTATE(vfsp, vn, ns)	fsop_vnstate(vfsp, vn, ns)
369 
370 #define	VFSNAME_MOUNT		"mount"
371 #define	VFSNAME_UNMOUNT		"unmount"
372 #define	VFSNAME_ROOT		"root"
373 #define	VFSNAME_STATVFS		"statvfs"
374 #define	VFSNAME_SYNC		"sync"
375 #define	VFSNAME_VGET		"vget"
376 #define	VFSNAME_MOUNTROOT	"mountroot"
377 #define	VFSNAME_FREEVFS		"freevfs"
378 #define	VFSNAME_VNSTATE		"vnstate"
379 /*
380  * Filesystem type switch table.
381  */
382 
383 typedef struct vfssw {
384 	char		*vsw_name;	/* type name -- max len _ST_FSTYPSZ */
385 	int		(*vsw_init) (int, char *);
386 				/* init routine (for non-loadable fs only) */
387 	int		vsw_flag;	/* flags */
388 	mntopts_t	vsw_optproto;	/* mount options table prototype */
389 	uint_t		vsw_count;	/* count of references */
390 	kmutex_t	vsw_lock;	/* lock to protect vsw_count */
391 	vfsops_t	vsw_vfsops;	/* filesystem operations vector */
392 } vfssw_t;
393 
394 /*
395  * Filesystem type definition record.  All file systems must export a record
396  * of this type through their modlfs structure.  N.B., changing the version
397  * number requires a change in sys/modctl.h.
398  */
399 
400 typedef struct vfsdef_v5 {
401 	int		def_version;	/* structure version, must be first */
402 	char		*name;		/* filesystem type name */
403 	int		(*init) (int, char *);	/* init routine */
404 	int		flags;		/* filesystem flags */
405 	mntopts_t	*optproto;	/* mount options table prototype */
406 } vfsdef_v5;
407 
408 typedef struct vfsdef_v5 vfsdef_t;
409 
410 enum {
411 	VFSDEF_VERSION = 5
412 };
413 
414 /*
415  * flags for vfssw and vfsdef
416  */
417 #define	VSW_HASPROTO	0x01	/* struct has a mount options prototype */
418 #define	VSW_CANRWRO	0x02	/* file system can transition from rw to ro */
419 #define	VSW_CANREMOUNT	0x04	/* file system supports remounts */
420 #define	VSW_NOTZONESAFE	0x08	/* zone_enter(2) should fail for these files */
421 #define	VSW_VOLATILEDEV	0x10	/* vfs_dev can change each time fs is mounted */
422 #define	VSW_STATS	0x20	/* file system can collect stats */
423 #define	VSW_XID		0x40	/* file system supports extended ids */
424 #define	VSW_CANLOFI	0x80	/* file system supports lofi mounts */
425 #define	VSW_ZMOUNT	0x100	/* file system always allowed in a zone */
426 
427 #define	VSW_INSTALLED	0x8000	/* this vsw is associated with a file system */
428 
429 /*
430  * A flag for vfs_setpath().
431  */
432 #define	VFSSP_VERBATIM	0x1	/* do not prefix the supplied path */
433 
434 #if defined(_KERNEL) || defined(_FAKE_KERNEL)
435 
436 /*
437  * Private vfs data, NOT to be used by a file system implementation.
438  */
439 
440 #define	VFS_FEATURE_MAXSZ	4
441 
442 typedef struct vfs_impl {
443 	/* Counted array - Bitmap of vfs features */
444 	uint32_t	vi_featureset[VFS_FEATURE_MAXSZ];
445 	/*
446 	 * Support for statistics on the vnode operations
447 	 */
448 	vsk_anchor_t	*vi_vskap;		/* anchor for vopstats' kstat */
449 	vopstats_t	*vi_fstypevsp;		/* ptr to per-fstype vopstats */
450 	vopstats_t	vi_vopstats;		/* per-mount vnode op stats */
451 
452 	timespec_t	vi_hrctime; 		/* High-res creation time */
453 
454 	zone_ref_t	vi_zone_ref;		/* reference to zone */
455 } vfs_impl_t;
456 
457 /*
458  * Public operations.
459  */
460 struct umounta;
461 struct statvfsa;
462 struct fstatvfsa;
463 
464 void	vfs_freevfsops(vfsops_t *);
465 int	vfs_freevfsops_by_type(int);
466 void	vfs_setops(vfs_t *, vfsops_t *);
467 vfsops_t *vfs_getops(vfs_t *vfsp);
468 int	vfs_matchops(vfs_t *, vfsops_t *);
469 int	vfs_can_sync(vfs_t *vfsp);
470 vfs_t	*vfs_alloc(int);
471 void	vfs_free(vfs_t *);
472 void	vfs_init(vfs_t *vfsp, vfsops_t *, void *);
473 void	vfsimpl_setup(vfs_t *vfsp);
474 void	vfsimpl_teardown(vfs_t *vfsp);
475 void	vn_exists(vnode_t *);
476 void	vn_idle(vnode_t *);
477 void	vn_reclaim(vnode_t *);
478 void	vn_invalid(vnode_t *);
479 
480 int	rootconf(void);
481 int	domount(char *, struct mounta *, vnode_t *, struct cred *,
482 	    struct vfs **);
483 int	dounmount(struct vfs *, int, cred_t *);
484 int	vfs_lock(struct vfs *);
485 int	vfs_rlock(struct vfs *);
486 void	vfs_lock_wait(struct vfs *);
487 void	vfs_rlock_wait(struct vfs *);
488 void	vfs_unlock(struct vfs *);
489 int	vfs_lock_held(struct vfs *);
490 struct	_kthread *vfs_lock_owner(struct vfs *);
491 void	sync(void);
492 void	vfs_sync(int);
493 void	vfs_mountroot(void);
494 void	vfs_add(vnode_t *, struct vfs *, int);
495 void	vfs_remove(struct vfs *);
496 
497 /* VFS feature routines */
498 void	vfs_set_feature(vfs_t *, vfs_feature_t);
499 void	vfs_clear_feature(vfs_t *, vfs_feature_t);
500 int	vfs_has_feature(vfs_t *, vfs_feature_t);
501 void	vfs_propagate_features(vfs_t *, vfs_t *);
502 
503 /* The following functions are not for general use by filesystems */
504 
505 void	vfs_createopttbl(mntopts_t *, const char *);
506 void	vfs_copyopttbl(const mntopts_t *, mntopts_t *);
507 void	vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *);
508 void	vfs_freeopttbl(mntopts_t *);
509 void	vfs_parsemntopts(mntopts_t *, char *, int);
510 int	vfs_buildoptionstr(const mntopts_t *, char *, int);
511 struct mntopt *vfs_hasopt(const mntopts_t *, const char *);
512 void	vfs_mnttab_modtimeupd(void);
513 
514 void	vfs_clearmntopt(struct vfs *, const char *);
515 void	vfs_setmntopt(struct vfs *, const char *, const char *, int);
516 void	vfs_setresource(struct vfs *, const char *, uint32_t);
517 void	vfs_setmntpoint(struct vfs *, const char *, uint32_t);
518 refstr_t *vfs_getresource(const struct vfs *);
519 refstr_t *vfs_getmntpoint(const struct vfs *);
520 int	vfs_optionisset(const struct vfs *, const char *, char **);
521 int	vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *);
522 int	vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *);
523 void	vfs_syncall(void);
524 void	vfs_syncprogress(void);
525 void	vfsinit(void);
526 void	vfs_unmountall(void);
527 void	vfs_make_fsid(fsid_t *, dev_t, int);
528 void	vfs_addmip(dev_t, struct vfs *);
529 void	vfs_delmip(struct vfs *);
530 int	vfs_devismounted(dev_t);
531 int	vfs_devmounting(dev_t, struct vfs *);
532 int	vfs_opsinuse(vfsops_t *);
533 struct vfs *getvfs(fsid_t *);
534 struct vfs *vfs_dev2vfsp(dev_t);
535 struct vfs *vfs_mntpoint2vfsp(const char *);
536 struct vfssw *allocate_vfssw(const char *);
537 struct vfssw *vfs_getvfssw(const char *);
538 struct vfssw *vfs_getvfsswbyname(const char *);
539 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *);
540 void	vfs_refvfssw(struct vfssw *);
541 void	vfs_unrefvfssw(struct vfssw *);
542 uint_t	vf_to_stf(uint_t);
543 void	vfs_mnttab_modtime(timespec_t *);
544 void	vfs_mnttab_poll(timespec_t *, struct pollhead **);
545 
546 void	vfs_list_lock(void);
547 void	vfs_list_read_lock(void);
548 void	vfs_list_unlock(void);
549 void	vfs_list_add(struct vfs *);
550 void	vfs_list_remove(struct vfs *);
551 void	vfs_hold(vfs_t *vfsp);
552 void	vfs_rele(vfs_t *vfsp);
553 void	fs_freevfs(vfs_t *);
554 void	vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype);
555 
556 int	vfs_zone_change_safe(vfs_t *);
557 
558 int	vfs_get_lofi(vfs_t *, vnode_t **);
559 
560 #define	VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1))
561 #define	VFS_ON_LIST(vfsp) \
562 	((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL)
563 
564 /*
565  * Globals.
566  */
567 
568 extern struct vfssw vfssw[];		/* table of filesystem types */
569 extern krwlock_t vfssw_lock;
570 extern char rootfstype[];		/* name of root fstype */
571 extern const int nfstype;		/* # of elements in vfssw array */
572 extern vfsops_t *EIO_vfsops;		/* operations for vfs being torn-down */
573 
574 /*
575  * The following variables are private to the the kernel's vfs layer.  File
576  * system implementations should not access them.
577  */
578 extern struct vfs *rootvfs;		/* ptr to root vfs structure */
579 typedef struct {
580 	struct vfs *rvfs_head;		/* head vfs in chain */
581 	kmutex_t rvfs_lock;		/* mutex protecting this chain */
582 	uint32_t rvfs_len;		/* length of this chain */
583 } rvfs_t;
584 extern rvfs_t *rvfs_list;
585 extern int vfshsz;			/* # of elements in rvfs_head array */
586 extern const mntopts_t vfs_mntopts;	/* globally recognized options */
587 
588 #endif /* defined(_KERNEL) */
589 
590 #define	VFS_HOLD(vfsp) { \
591 	vfs_hold(vfsp); \
592 }
593 
594 #define	VFS_RELE(vfsp)	{ \
595 	vfs_rele(vfsp); \
596 }
597 
598 #define	VFS_INIT(vfsp, op, data) { \
599 	vfs_init((vfsp), (op), (data)); \
600 }
601 
602 
603 #define	VFS_INSTALLED(vfsswp)	(((vfsswp)->vsw_flag & VSW_INSTALLED) != 0)
604 #define	ALLOCATED_VFSSW(vswp)		((vswp)->vsw_name[0] != '\0')
605 #define	RLOCK_VFSSW()			(rw_enter(&vfssw_lock, RW_READER))
606 #define	RUNLOCK_VFSSW()			(rw_exit(&vfssw_lock))
607 #define	WLOCK_VFSSW()			(rw_enter(&vfssw_lock, RW_WRITER))
608 #define	WUNLOCK_VFSSW()			(rw_exit(&vfssw_lock))
609 #define	VFSSW_LOCKED()			(RW_LOCK_HELD(&vfssw_lock))
610 #define	VFSSW_WRITE_LOCKED()		(RW_WRITE_HELD(&vfssw_lock))
611 /*
612  * VFS_SYNC flags.
613  */
614 #define	SYNC_ATTR	0x01		/* sync attributes only */
615 #define	SYNC_CLOSE	0x02		/* close open file */
616 #define	SYNC_ALL	0x04		/* force to sync all fs */
617 
618 #ifdef	__cplusplus
619 }
620 #endif
621 
622 #endif	/* _SYS_VFS_H */
623