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 (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
24 */
25
26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * Portions of this source code were derived from Berkeley 4.3 BSD
31 * under license from the Regents of the University of California.
32 */
33
34 #ifndef _SYS_VFS_H
35 #define _SYS_VFS_H
36
37 #include <sys/zone.h>
38 #include <sys/types.h>
39 #include <sys/t_lock.h>
40 #include <sys/cred.h>
41 #include <sys/vnode.h>
42 #include <sys/statvfs.h>
43 #include <sys/refstr.h>
44 #include <sys/avl.h>
45 #include <sys/time.h>
46
47 #ifdef __cplusplus
48 extern "C" {
49 #endif
50
51 /*
52 * Data associated with mounted file systems.
53 */
54
55 /*
56 * Operations vector. This is used internal to the kernel; file systems
57 * supply their list of operations via vfs_setfsops().
58 */
59
60 typedef struct vfsops vfsops_t;
61
62 /*
63 * File system identifier. Should be unique (at least per machine).
64 */
65 typedef struct {
66 int val[2]; /* file system id type */
67 } fsid_t;
68
69 /*
70 * File identifier. Should be unique per filesystem on a single
71 * machine. This is typically called by a stateless file server
72 * in order to generate "file handles".
73 *
74 * Do not change the definition of struct fid ... fid_t without
75 * letting the CacheFS group know about it! They will have to do at
76 * least two things, in the same change that changes this structure:
77 * 1. change CFSVERSION in usr/src/uts/common/sys/fs/cachefs_fs.h
78 * 2. put the old version # in the canupgrade array
79 * in cachfs_upgrade() in usr/src/cmd/fs.d/cachefs/fsck/fsck.c
80 * This is necessary because CacheFS stores FIDs on disk.
81 *
82 * Many underlying file systems cast a struct fid into other
83 * file system dependent structures which may require 4 byte alignment.
84 * Because a fid starts with a short it may not be 4 byte aligned, the
85 * fid_pad will force the alignment.
86 */
87 #define MAXFIDSZ 64
88 #define OLD_MAXFIDSZ 16
89
90 typedef struct fid {
91 union {
92 long fid_pad;
93 struct {
94 ushort_t len; /* length of data in bytes */
95 char data[MAXFIDSZ]; /* data (variable len) */
96 } _fid;
97 } un;
98 } fid_t;
99
100 #ifdef _SYSCALL32
101 /*
102 * Solaris 64 - use old-style cache format with 32-bit aligned fid for on-disk
103 * struct compatibility.
104 */
105 typedef struct fid32 {
106 union {
107 int32_t fid_pad;
108 struct {
109 uint16_t len; /* length of data in bytes */
110 char data[MAXFIDSZ]; /* data (variable len) */
111 } _fid;
112 } un;
113 } fid32_t;
114 #else /* not _SYSCALL32 */
115 #define fid32 fid
116 typedef fid_t fid32_t;
117 #endif /* _SYSCALL32 */
118
119 #define fid_len un._fid.len
120 #define fid_data un._fid.data
121
122 /*
123 * Structure defining a mount option for a filesystem.
124 * option names are found in mntent.h
125 */
126 typedef struct mntopt {
127 char *mo_name; /* option name */
128 char **mo_cancel; /* list of options cancelled by this one */
129 char *mo_arg; /* argument string for this option */
130 int mo_flags; /* flags for this mount option */
131 void *mo_data; /* filesystem specific data */
132 } mntopt_t;
133
134 /*
135 * Flags that apply to mount options
136 */
137
138 #define MO_SET 0x01 /* option is set */
139 #define MO_NODISPLAY 0x02 /* option not listed in mnttab */
140 #define MO_HASVALUE 0x04 /* option takes a value */
141 #define MO_IGNORE 0x08 /* option ignored by parser */
142 #define MO_DEFAULT MO_SET /* option is on by default */
143 #define MO_TAG 0x10 /* flags a tag set by user program */
144 #define MO_EMPTY 0x20 /* empty space in option table */
145
146 #define VFS_NOFORCEOPT 0x01 /* honor MO_IGNORE (don't set option) */
147 #define VFS_DISPLAY 0x02 /* Turn off MO_NODISPLAY bit for opt */
148 #define VFS_NODISPLAY 0x04 /* Turn on MO_NODISPLAY bit for opt */
149 #define VFS_CREATEOPT 0x08 /* Create the opt if it's not there */
150
151 /*
152 * Structure holding mount option strings for the mounted file system.
153 */
154 typedef struct mntopts {
155 uint_t mo_count; /* number of entries in table */
156 mntopt_t *mo_list; /* list of mount options */
157 } mntopts_t;
158
159 /*
160 * The kstat structures associated with the vopstats are kept in an
161 * AVL tree. This is to avoid the case where a file system does not
162 * use a unique fsid_t for each vfs (e.g., namefs). In order to do
163 * this, we need a structure that the AVL tree can use that also
164 * references the kstat.
165 * Note that the vks_fsid is generated from the value reported by
166 * VFS_STATVFS().
167 */
168 typedef struct vskstat_anchor {
169 avl_node_t vsk_node; /* Required for use by AVL routines */
170 kstat_t *vsk_ksp; /* kstat structure for vopstats */
171 ulong_t vsk_fsid; /* fsid associated w/this FS */
172 } vsk_anchor_t;
173
174 extern avl_tree_t vskstat_tree;
175 extern kmutex_t vskstat_tree_lock;
176
177 /*
178 * Structure per mounted file system. Each mounted file system has
179 * an array of operations and an instance record.
180 *
181 * The file systems are kept on a doubly linked circular list headed by
182 * "rootvfs".
183 * File system implementations should not access this list;
184 * it's intended for use only in the kernel's vfs layer.
185 *
186 * Each zone also has its own list of mounts, containing filesystems mounted
187 * somewhere within the filesystem tree rooted at the zone's rootpath. The
188 * list is doubly linked to match the global list.
189 *
190 * mnttab locking: the in-kernel mnttab uses the vfs_mntpt, vfs_resource and
191 * vfs_mntopts fields in the vfs_t. mntpt and resource are refstr_ts that
192 * are set at mount time and can only be modified during a remount.
193 * It is safe to read these fields if you can prevent a remount on the vfs,
194 * or through the convenience funcs vfs_getmntpoint() and vfs_getresource().
195 * The mntopts field may only be accessed through the provided convenience
196 * functions, as it is protected by the vfs list lock. Modifying a mount
197 * option requires grabbing the vfs list write lock, which can be a very
198 * high latency lock.
199 */
200 struct zone; /* from zone.h */
201 struct fem_head; /* from fem.h */
202
203 typedef struct vfs {
204 struct vfs *vfs_next; /* next VFS in VFS list */
205 struct vfs *vfs_prev; /* prev VFS in VFS list */
206
207 /* vfs_op should not be used directly. Accessor functions are provided */
208 vfsops_t *vfs_op; /* operations on VFS */
209
210 struct vnode *vfs_vnodecovered; /* vnode mounted on */
211 uint_t vfs_flag; /* flags */
212 uint_t vfs_bsize; /* native block size */
213 int vfs_fstype; /* file system type index */
214 fsid_t vfs_fsid; /* file system id */
215 void *vfs_data; /* private data */
216 dev_t vfs_dev; /* device of mounted VFS */
217 ulong_t vfs_bcount; /* I/O count (accounting) */
218 struct vfs *vfs_list; /* sync list pointer */
219 struct vfs *vfs_hash; /* hash list pointer */
220 ksema_t vfs_reflock; /* mount/unmount/sync lock */
221 uint_t vfs_count; /* vfs reference count */
222 mntopts_t vfs_mntopts; /* options mounted with */
223 refstr_t *vfs_resource; /* mounted resource name */
224 refstr_t *vfs_mntpt; /* mount point name */
225 time_t vfs_mtime; /* time we were mounted */
226 struct vfs_impl *vfs_implp; /* impl specific data */
227 /*
228 * Zones support. Note that the zone that "owns" the mount isn't
229 * necessarily the same as the zone in which the zone is visible.
230 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to
231 * different zones.
232 */
233 struct zone *vfs_zone; /* zone that owns the mount */
234 struct vfs *vfs_zone_next; /* next VFS visible in zone */
235 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */
236
237 struct fem_head *vfs_femhead; /* fs monitoring */
238 minor_t vfs_lofi_minor; /* minor if lofi mount */
239 } vfs_t;
240
241 #define vfs_featureset vfs_implp->vi_featureset
242 #define vfs_vskap vfs_implp->vi_vskap
243 #define vfs_fstypevsp vfs_implp->vi_fstypevsp
244 #define vfs_vopstats vfs_implp->vi_vopstats
245 #define vfs_hrctime vfs_implp->vi_hrctime
246
247 /*
248 * VFS flags.
249 */
250 #define VFS_RDONLY 0x01 /* read-only vfs */
251 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */
252 #define VFS_NOSETUID 0x08 /* setuid disallowed */
253 #define VFS_REMOUNT 0x10 /* modify mount options only */
254 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */
255 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */
256 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */
257 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */
258 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */
259 #define VFS_XATTR 0x400 /* fs supports extended attributes */
260 #define VFS_NODEVICES 0x800 /* device-special files disallowed */
261 #define VFS_NOEXEC 0x1000 /* executables disallowed */
262 #define VFS_STATS 0x2000 /* file system can collect stats */
263 #define VFS_XID 0x4000 /* file system supports extended ids */
264
265 #define VFS_NORESOURCE "unspecified_resource"
266 #define VFS_NOMNTPT "unspecified_mountpoint"
267
268 /*
269 * VFS features are implemented as bits set in the vfs_t.
270 * The vfs_feature_t typedef is a 64-bit number that will translate
271 * into an element in an array of bitmaps and a bit in that element.
272 * Developers must not depend on the implementation of this and
273 * need to use vfs_has_feature()/vfs_set_feature() routines.
274 */
275 typedef uint64_t vfs_feature_t;
276
277 #define VFSFT_XVATTR 0x100000001 /* Supports xvattr for attrs */
278 #define VFSFT_CASEINSENSITIVE 0x100000002 /* Supports case-insensitive */
279 #define VFSFT_NOCASESENSITIVE 0x100000004 /* NOT case-sensitive */
280 #define VFSFT_DIRENTFLAGS 0x100000008 /* Supports dirent flags */
281 #define VFSFT_ACLONCREATE 0x100000010 /* Supports ACL on create */
282 #define VFSFT_ACEMASKONACCESS 0x100000020 /* Can use ACEMASK for access */
283 #define VFSFT_SYSATTR_VIEWS 0x100000040 /* Supports sysattr view i/f */
284 #define VFSFT_ACCESS_FILTER 0x100000080 /* dirents filtered by access */
285 #define VFSFT_REPARSE 0x100000100 /* Supports reparse point */
286 #define VFSFT_ZEROCOPY_SUPPORTED 0x100000200
287 /* Support loaning /returning cache buffer */
288 /*
289 * Argument structure for mount(2).
290 *
291 * Flags are defined in <sys/mount.h>.
292 *
293 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in
294 * this structure are to be interpreted as kernel addresses. File systems
295 * should be prepared for this possibility.
296 */
297 struct mounta {
298 char *spec;
299 char *dir;
300 int flags;
301 char *fstype;
302 char *dataptr;
303 int datalen;
304 char *optptr;
305 int optlen;
306 };
307
308 /*
309 * Reasons for calling the vfs_mountroot() operation.
310 */
311 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT};
312 typedef enum whymountroot whymountroot_t;
313
314 /*
315 * Reasons for calling the VFS_VNSTATE():
316 */
317 enum vntrans {
318 VNTRANS_EXISTS,
319 VNTRANS_IDLED,
320 VNTRANS_RECLAIMED,
321 VNTRANS_DESTROYED
322 };
323 typedef enum vntrans vntrans_t;
324
325 /*
326 * VFS_OPS defines all the vfs operations. It is used to define
327 * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h).
328 */
329 #define VFS_OPS \
330 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \
331 int (*vfs_unmount)(vfs_t *, int, cred_t *); \
332 int (*vfs_root)(vfs_t *, vnode_t **); \
333 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); \
334 int (*vfs_sync)(vfs_t *, short, cred_t *); \
335 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); \
336 int (*vfs_mountroot)(vfs_t *, enum whymountroot); \
337 void (*vfs_freevfs)(vfs_t *); \
338 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t) /* NB: No ";" */
339
340 /*
341 * Operations supported on virtual file system.
342 */
343 struct vfsops {
344 VFS_OPS; /* Signature of all vfs operations (vfsops) */
345 };
346
347 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *);
348 extern int fsop_unmount(vfs_t *, int, cred_t *);
349 extern int fsop_root(vfs_t *, vnode_t **);
350 extern int fsop_statfs(vfs_t *, statvfs64_t *);
351 extern int fsop_sync(vfs_t *, short, cred_t *);
352 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *);
353 extern int fsop_mountroot(vfs_t *, enum whymountroot);
354 extern void fsop_freefs(vfs_t *);
355 extern int fsop_sync_by_kind(int, short, cred_t *);
356 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t);
357
358 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr)
359 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr)
360 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp)
361 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp)
362 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr)
363 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp)
364 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init)
365 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp)
366 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns)
367
368 #define VFSNAME_MOUNT "mount"
369 #define VFSNAME_UNMOUNT "unmount"
370 #define VFSNAME_ROOT "root"
371 #define VFSNAME_STATVFS "statvfs"
372 #define VFSNAME_SYNC "sync"
373 #define VFSNAME_VGET "vget"
374 #define VFSNAME_MOUNTROOT "mountroot"
375 #define VFSNAME_FREEVFS "freevfs"
376 #define VFSNAME_VNSTATE "vnstate"
377 /*
378 * Filesystem type switch table.
379 */
380
381 typedef struct vfssw {
382 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */
383 int (*vsw_init) (int, char *);
384 /* init routine (for non-loadable fs only) */
385 int vsw_flag; /* flags */
386 mntopts_t vsw_optproto; /* mount options table prototype */
387 uint_t vsw_count; /* count of references */
388 kmutex_t vsw_lock; /* lock to protect vsw_count */
389 vfsops_t vsw_vfsops; /* filesystem operations vector */
390 } vfssw_t;
391
392 /*
393 * Filesystem type definition record. All file systems must export a record
394 * of this type through their modlfs structure. N.B., changing the version
395 * number requires a change in sys/modctl.h.
396 */
397
398 typedef struct vfsdef_v5 {
399 int def_version; /* structure version, must be first */
400 char *name; /* filesystem type name */
401 int (*init) (int, char *); /* init routine */
402 int flags; /* filesystem flags */
403 mntopts_t *optproto; /* mount options table prototype */
404 } vfsdef_v5;
405
406 typedef struct vfsdef_v5 vfsdef_t;
407
408 enum {
409 VFSDEF_VERSION = 5
410 };
411
412 /*
413 * flags for vfssw and vfsdef
414 */
415 #define VSW_HASPROTO 0x01 /* struct has a mount options prototype */
416 #define VSW_CANRWRO 0x02 /* file system can transition from rw to ro */
417 #define VSW_CANREMOUNT 0x04 /* file system supports remounts */
418 #define VSW_NOTZONESAFE 0x08 /* zone_enter(2) should fail for these files */
419 #define VSW_VOLATILEDEV 0x10 /* vfs_dev can change each time fs is mounted */
420 #define VSW_STATS 0x20 /* file system can collect stats */
421 #define VSW_XID 0x40 /* file system supports extended ids */
422 #define VSW_CANLOFI 0x80 /* file system supports lofi mounts */
423 #define VSW_ZMOUNT 0x100 /* file system always allowed in a zone */
424
425 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */
426
427 /*
428 * A flag for vfs_setpath().
429 */
430 #define VFSSP_VERBATIM 0x1 /* do not prefix the supplied path */
431
432 #if defined(_KERNEL) || defined(_FAKE_KERNEL)
433
434 /*
435 * Private vfs data, NOT to be used by a file system implementation.
436 */
437
438 #define VFS_FEATURE_MAXSZ 4
439
440 typedef struct vfs_impl {
441 /* Counted array - Bitmap of vfs features */
442 uint32_t vi_featureset[VFS_FEATURE_MAXSZ];
443 /*
444 * Support for statistics on the vnode operations
445 */
446 vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */
447 vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */
448 vopstats_t vi_vopstats; /* per-mount vnode op stats */
449
450 timespec_t vi_hrctime; /* High-res creation time */
451
452 zone_ref_t vi_zone_ref; /* reference to zone */
453 } vfs_impl_t;
454
455 /*
456 * Public operations.
457 */
458 struct umounta;
459 struct statvfsa;
460 struct fstatvfsa;
461
462 void vfs_freevfsops(vfsops_t *);
463 int vfs_freevfsops_by_type(int);
464 void vfs_setops(vfs_t *, vfsops_t *);
465 vfsops_t *vfs_getops(vfs_t *vfsp);
466 int vfs_matchops(vfs_t *, vfsops_t *);
467 int vfs_can_sync(vfs_t *vfsp);
468 vfs_t *vfs_alloc(int);
469 void vfs_free(vfs_t *);
470 void vfs_init(vfs_t *vfsp, vfsops_t *, void *);
471 void vfsimpl_setup(vfs_t *vfsp);
472 void vfsimpl_teardown(vfs_t *vfsp);
473 void vn_exists(vnode_t *);
474 void vn_idle(vnode_t *);
475 void vn_reclaim(vnode_t *);
476 void vn_invalid(vnode_t *);
477
478 int rootconf(void);
479 int svm_rootconf(void);
480 int domount(char *, struct mounta *, vnode_t *, struct cred *,
481 struct vfs **);
482 int dounmount(struct vfs *, int, cred_t *);
483 int vfs_lock(struct vfs *);
484 int vfs_rlock(struct vfs *);
485 void vfs_lock_wait(struct vfs *);
486 void vfs_rlock_wait(struct vfs *);
487 void vfs_unlock(struct vfs *);
488 int vfs_lock_held(struct vfs *);
489 struct _kthread *vfs_lock_owner(struct vfs *);
490 void sync(void);
491 void vfs_sync(int);
492 void vfs_mountroot(void);
493 void vfs_add(vnode_t *, struct vfs *, int);
494 void vfs_remove(struct vfs *);
495
496 /* VFS feature routines */
497 void vfs_set_feature(vfs_t *, vfs_feature_t);
498 void vfs_clear_feature(vfs_t *, vfs_feature_t);
499 int vfs_has_feature(vfs_t *, vfs_feature_t);
500 void vfs_propagate_features(vfs_t *, vfs_t *);
501
502 /* The following functions are not for general use by filesystems */
503
504 void vfs_createopttbl(mntopts_t *, const char *);
505 void vfs_copyopttbl(const mntopts_t *, mntopts_t *);
506 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *);
507 void vfs_freeopttbl(mntopts_t *);
508 void vfs_parsemntopts(mntopts_t *, char *, int);
509 int vfs_buildoptionstr(const mntopts_t *, char *, int);
510 struct mntopt *vfs_hasopt(const mntopts_t *, const char *);
511 void vfs_mnttab_modtimeupd(void);
512
513 void vfs_clearmntopt(struct vfs *, const char *);
514 void vfs_setmntopt(struct vfs *, const char *, const char *, int);
515 void vfs_setresource(struct vfs *, const char *, uint32_t);
516 void vfs_setmntpoint(struct vfs *, const char *, uint32_t);
517 refstr_t *vfs_getresource(const struct vfs *);
518 refstr_t *vfs_getmntpoint(const struct vfs *);
519 int vfs_optionisset(const struct vfs *, const char *, char **);
520 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *);
521 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *);
522 void vfs_syncall(void);
523 void vfs_syncprogress(void);
524 void vfsinit(void);
525 void vfs_unmountall(void);
526 void vfs_make_fsid(fsid_t *, dev_t, int);
527 void vfs_addmip(dev_t, struct vfs *);
528 void vfs_delmip(struct vfs *);
529 int vfs_devismounted(dev_t);
530 int vfs_devmounting(dev_t, struct vfs *);
531 int vfs_opsinuse(vfsops_t *);
532 struct vfs *getvfs(fsid_t *);
533 struct vfs *vfs_dev2vfsp(dev_t);
534 struct vfs *vfs_mntpoint2vfsp(const char *);
535 struct vfssw *allocate_vfssw(const char *);
536 struct vfssw *vfs_getvfssw(const char *);
537 struct vfssw *vfs_getvfsswbyname(const char *);
538 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *);
539 void vfs_refvfssw(struct vfssw *);
540 void vfs_unrefvfssw(struct vfssw *);
541 uint_t vf_to_stf(uint_t);
542 void vfs_mnttab_modtime(timespec_t *);
543 void vfs_mnttab_poll(timespec_t *, struct pollhead **);
544
545 void vfs_list_lock(void);
546 void vfs_list_read_lock(void);
547 void vfs_list_unlock(void);
548 void vfs_list_add(struct vfs *);
549 void vfs_list_remove(struct vfs *);
550 void vfs_hold(vfs_t *vfsp);
551 void vfs_rele(vfs_t *vfsp);
552 void fs_freevfs(vfs_t *);
553 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype);
554
555 int vfs_zone_change_safe(vfs_t *);
556
557 int vfs_get_lofi(vfs_t *, vnode_t **);
558
559 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1))
560 #define VFS_ON_LIST(vfsp) \
561 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL)
562
563 /*
564 * Globals.
565 */
566
567 extern struct vfssw vfssw[]; /* table of filesystem types */
568 extern krwlock_t vfssw_lock;
569 extern char rootfstype[]; /* name of root fstype */
570 extern const int nfstype; /* # of elements in vfssw array */
571 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */
572
573 /*
574 * The following variables are private to the the kernel's vfs layer. File
575 * system implementations should not access them.
576 */
577 extern struct vfs *rootvfs; /* ptr to root vfs structure */
578 typedef struct {
579 struct vfs *rvfs_head; /* head vfs in chain */
580 kmutex_t rvfs_lock; /* mutex protecting this chain */
581 uint32_t rvfs_len; /* length of this chain */
582 } rvfs_t;
583 extern rvfs_t *rvfs_list;
584 extern int vfshsz; /* # of elements in rvfs_head array */
585 extern const mntopts_t vfs_mntopts; /* globally recognized options */
586
587 #endif /* defined(_KERNEL) */
588
589 #define VFS_HOLD(vfsp) { \
590 vfs_hold(vfsp); \
591 }
592
593 #define VFS_RELE(vfsp) { \
594 vfs_rele(vfsp); \
595 }
596
597 #define VFS_INIT(vfsp, op, data) { \
598 vfs_init((vfsp), (op), (data)); \
599 }
600
601
602 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0)
603 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0')
604 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER))
605 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock))
606 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER))
607 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock))
608 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock))
609 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock))
610 /*
611 * VFS_SYNC flags.
612 */
613 #define SYNC_ATTR 0x01 /* sync attributes only */
614 #define SYNC_CLOSE 0x02 /* close open file */
615 #define SYNC_ALL 0x04 /* force to sync all fs */
616
617 #ifdef __cplusplus
618 }
619 #endif
620
621 #endif /* _SYS_VFS_H */