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