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 avl_node_t vfs_avldev; /* by dev index */
207 avl_node_t vfs_avlmntpnt; /* by mntpnt index */
208 /*
209 * global mount count to define an order on entries in
210 * the avl trees with same dev/mountpoint
211 */
212 uint64_t vfs_mntix;
213
214 /* vfs_op should not be used directly. Accessor functions are provided */
215 vfsops_t *vfs_op; /* operations on VFS */
216
217 struct vnode *vfs_vnodecovered; /* vnode mounted on */
218 uint_t vfs_flag; /* flags */
219 uint_t vfs_bsize; /* native block size */
220 int vfs_fstype; /* file system type index */
221 fsid_t vfs_fsid; /* file system id */
222 void *vfs_data; /* private data */
223 dev_t vfs_dev; /* device of mounted VFS */
224 ulong_t vfs_bcount; /* I/O count (accounting) */
225 struct vfs *vfs_list; /* sync list pointer */
226 struct vfs *vfs_hash; /* hash list pointer */
227 ksema_t vfs_reflock; /* mount/unmount/sync lock */
228 uint_t vfs_count; /* vfs reference count */
229 mntopts_t vfs_mntopts; /* options mounted with */
230 refstr_t *vfs_resource; /* mounted resource name */
231 refstr_t *vfs_mntpt; /* mount point name */
232 time_t vfs_mtime; /* time we were mounted */
233 struct vfs_impl *vfs_implp; /* impl specific data */
234 /*
235 * Zones support. Note that the zone that "owns" the mount isn't
236 * necessarily the same as the zone in which the zone is visible.
237 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to
238 * different zones.
239 */
240 struct zone *vfs_zone; /* zone that owns the mount */
241 struct vfs *vfs_zone_next; /* next VFS visible in zone */
242 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */
243
244 struct fem_head *vfs_femhead; /* fs monitoring */
245 minor_t vfs_lofi_minor; /* minor if lofi mount */
246 } vfs_t;
247
248 #define vfs_featureset vfs_implp->vi_featureset
249 #define vfs_vskap vfs_implp->vi_vskap
250 #define vfs_fstypevsp vfs_implp->vi_fstypevsp
251 #define vfs_vopstats vfs_implp->vi_vopstats
252 #define vfs_hrctime vfs_implp->vi_hrctime
253
254 /*
255 * VFS flags.
256 */
257 #define VFS_RDONLY 0x01 /* read-only vfs */
258 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */
259 #define VFS_NOSETUID 0x08 /* setuid disallowed */
260 #define VFS_REMOUNT 0x10 /* modify mount options only */
261 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */
262 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */
263 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */
264 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */
265 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */
266 #define VFS_XATTR 0x400 /* fs supports extended attributes */
267 #define VFS_NODEVICES 0x800 /* device-special files disallowed */
268 #define VFS_NOEXEC 0x1000 /* executables disallowed */
269 #define VFS_STATS 0x2000 /* file system can collect stats */
270 #define VFS_XID 0x4000 /* file system supports extended ids */
271
272 #define VFS_NORESOURCE "unspecified_resource"
273 #define VFS_NOMNTPT "unspecified_mountpoint"
274
275 /*
276 * VFS features are implemented as bits set in the vfs_t.
277 * The vfs_feature_t typedef is a 64-bit number that will translate
278 * into an element in an array of bitmaps and a bit in that element.
279 * Developers must not depend on the implementation of this and
280 * need to use vfs_has_feature()/vfs_set_feature() routines.
281 */
282 typedef uint64_t vfs_feature_t;
283
284 #define VFSFT_XVATTR 0x100000001 /* Supports xvattr for attrs */
285 #define VFSFT_CASEINSENSITIVE 0x100000002 /* Supports case-insensitive */
286 #define VFSFT_NOCASESENSITIVE 0x100000004 /* NOT case-sensitive */
287 #define VFSFT_DIRENTFLAGS 0x100000008 /* Supports dirent flags */
288 #define VFSFT_ACLONCREATE 0x100000010 /* Supports ACL on create */
289 #define VFSFT_ACEMASKONACCESS 0x100000020 /* Can use ACEMASK for access */
290 #define VFSFT_SYSATTR_VIEWS 0x100000040 /* Supports sysattr view i/f */
291 #define VFSFT_ACCESS_FILTER 0x100000080 /* dirents filtered by access */
292 #define VFSFT_REPARSE 0x100000100 /* Supports reparse point */
293 #define VFSFT_ZEROCOPY_SUPPORTED 0x100000200
294 /* Support loaning /returning cache buffer */
295 /*
296 * Argument structure for mount(2).
297 *
298 * Flags are defined in <sys/mount.h>.
299 *
300 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in
301 * this structure are to be interpreted as kernel addresses. File systems
302 * should be prepared for this possibility.
303 */
304 struct mounta {
305 char *spec;
306 char *dir;
307 int flags;
308 char *fstype;
309 char *dataptr;
310 int datalen;
311 char *optptr;
312 int optlen;
313 };
314
315 /*
316 * Reasons for calling the vfs_mountroot() operation.
317 */
318 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT};
319 typedef enum whymountroot whymountroot_t;
320
321 /*
322 * Reasons for calling the VFS_VNSTATE():
323 */
324 enum vntrans {
325 VNTRANS_EXISTS,
326 VNTRANS_IDLED,
327 VNTRANS_RECLAIMED,
328 VNTRANS_DESTROYED
329 };
330 typedef enum vntrans vntrans_t;
331
332 /*
333 * VFS_OPS defines all the vfs operations. It is used to define
334 * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h).
335 */
336 #define VFS_OPS \
337 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \
338 int (*vfs_unmount)(vfs_t *, int, cred_t *); \
339 int (*vfs_root)(vfs_t *, vnode_t **); \
340 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); \
341 int (*vfs_sync)(vfs_t *, short, cred_t *); \
342 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); \
343 int (*vfs_mountroot)(vfs_t *, enum whymountroot); \
344 void (*vfs_freevfs)(vfs_t *); \
345 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t) /* NB: No ";" */
346
347 /*
348 * Operations supported on virtual file system.
349 */
350 struct vfsops {
351 VFS_OPS; /* Signature of all vfs operations (vfsops) */
352 };
353
354 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *);
355 extern int fsop_unmount(vfs_t *, int, cred_t *);
356 extern int fsop_root(vfs_t *, vnode_t **);
357 extern int fsop_statfs(vfs_t *, statvfs64_t *);
358 extern int fsop_sync(vfs_t *, short, cred_t *);
359 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *);
360 extern int fsop_mountroot(vfs_t *, enum whymountroot);
361 extern void fsop_freefs(vfs_t *);
362 extern int fsop_sync_by_kind(int, short, cred_t *);
363 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t);
364
365 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr)
366 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr)
367 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp)
368 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp)
369 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr)
370 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp)
371 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init)
372 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp)
373 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns)
374
375 #define VFSNAME_MOUNT "mount"
376 #define VFSNAME_UNMOUNT "unmount"
377 #define VFSNAME_ROOT "root"
378 #define VFSNAME_STATVFS "statvfs"
379 #define VFSNAME_SYNC "sync"
380 #define VFSNAME_VGET "vget"
381 #define VFSNAME_MOUNTROOT "mountroot"
382 #define VFSNAME_FREEVFS "freevfs"
383 #define VFSNAME_VNSTATE "vnstate"
384 /*
385 * Filesystem type switch table.
386 */
387
388 typedef struct vfssw {
389 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */
390 int (*vsw_init) (int, char *);
391 /* init routine (for non-loadable fs only) */
392 int vsw_flag; /* flags */
393 mntopts_t vsw_optproto; /* mount options table prototype */
394 uint_t vsw_count; /* count of references */
395 kmutex_t vsw_lock; /* lock to protect vsw_count */
396 vfsops_t vsw_vfsops; /* filesystem operations vector */
397 } vfssw_t;
398
399 /*
400 * Filesystem type definition record. All file systems must export a record
401 * of this type through their modlfs structure. N.B., changing the version
402 * number requires a change in sys/modctl.h.
403 */
404
405 typedef struct vfsdef_v5 {
406 int def_version; /* structure version, must be first */
407 char *name; /* filesystem type name */
408 int (*init) (int, char *); /* init routine */
409 int flags; /* filesystem flags */
410 mntopts_t *optproto; /* mount options table prototype */
411 } vfsdef_v5;
412
413 typedef struct vfsdef_v5 vfsdef_t;
414
415 enum {
416 VFSDEF_VERSION = 5
417 };
418
419 /*
420 * flags for vfssw and vfsdef
421 */
422 #define VSW_HASPROTO 0x01 /* struct has a mount options prototype */
423 #define VSW_CANRWRO 0x02 /* file system can transition from rw to ro */
424 #define VSW_CANREMOUNT 0x04 /* file system supports remounts */
425 #define VSW_NOTZONESAFE 0x08 /* zone_enter(2) should fail for these files */
426 #define VSW_VOLATILEDEV 0x10 /* vfs_dev can change each time fs is mounted */
427 #define VSW_STATS 0x20 /* file system can collect stats */
428 #define VSW_XID 0x40 /* file system supports extended ids */
429 #define VSW_CANLOFI 0x80 /* file system supports lofi mounts */
430 #define VSW_ZMOUNT 0x100 /* file system always allowed in a zone */
431
432 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */
433
434 /*
435 * A flag for vfs_setpath().
436 */
437 #define VFSSP_VERBATIM 0x1 /* do not prefix the supplied path */
438
439 #if defined(_KERNEL) || defined(_FAKE_KERNEL)
440
441 /*
442 * Private vfs data, NOT to be used by a file system implementation.
443 */
444
445 #define VFS_FEATURE_MAXSZ 4
446
447 typedef struct vfs_impl {
448 /* Counted array - Bitmap of vfs features */
449 uint32_t vi_featureset[VFS_FEATURE_MAXSZ];
450 /*
451 * Support for statistics on the vnode operations
452 */
453 vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */
454 vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */
455 vopstats_t vi_vopstats; /* per-mount vnode op stats */
456
457 timespec_t vi_hrctime; /* High-res creation time */
458
459 zone_ref_t vi_zone_ref; /* reference to zone */
460 } vfs_impl_t;
461
462 /*
463 * Public operations.
464 */
465 struct umounta;
466 struct statvfsa;
467 struct fstatvfsa;
468
469 void vfs_freevfsops(vfsops_t *);
470 int vfs_freevfsops_by_type(int);
471 void vfs_setops(vfs_t *, vfsops_t *);
472 vfsops_t *vfs_getops(vfs_t *vfsp);
473 int vfs_matchops(vfs_t *, vfsops_t *);
474 int vfs_can_sync(vfs_t *vfsp);
475 vfs_t *vfs_alloc(int);
476 void vfs_free(vfs_t *);
477 void vfs_init(vfs_t *vfsp, vfsops_t *, void *);
478 void vfsimpl_setup(vfs_t *vfsp);
479 void vfsimpl_teardown(vfs_t *vfsp);
480 void vn_exists(vnode_t *);
481 void vn_idle(vnode_t *);
482 void vn_reclaim(vnode_t *);
483 void vn_invalid(vnode_t *);
484
485 int rootconf(void);
486 int svm_rootconf(void);
487 int domount(char *, struct mounta *, vnode_t *, struct cred *,
488 struct vfs **);
489 int dounmount(struct vfs *, int, cred_t *);
490 int vfs_lock(struct vfs *);
491 int vfs_rlock(struct vfs *);
492 void vfs_lock_wait(struct vfs *);
493 void vfs_rlock_wait(struct vfs *);
494 void vfs_unlock(struct vfs *);
495 int vfs_lock_held(struct vfs *);
496 struct _kthread *vfs_lock_owner(struct vfs *);
497 void sync(void);
498 void vfs_sync(int);
499 void vfs_mountroot(void);
500 void vfs_add(vnode_t *, struct vfs *, int);
501 void vfs_remove(struct vfs *);
502
503 /* VFS feature routines */
504 void vfs_set_feature(vfs_t *, vfs_feature_t);
505 void vfs_clear_feature(vfs_t *, vfs_feature_t);
506 int vfs_has_feature(vfs_t *, vfs_feature_t);
507 void vfs_propagate_features(vfs_t *, vfs_t *);
508
509 /* The following functions are not for general use by filesystems */
510
511 void vfs_createopttbl(mntopts_t *, const char *);
512 void vfs_copyopttbl(const mntopts_t *, mntopts_t *);
513 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *);
514 void vfs_freeopttbl(mntopts_t *);
515 void vfs_parsemntopts(mntopts_t *, char *, int);
516 int vfs_buildoptionstr(const mntopts_t *, char *, int);
517 struct mntopt *vfs_hasopt(const mntopts_t *, const char *);
518 void vfs_mnttab_modtimeupd(void);
519
520 void vfs_clearmntopt(struct vfs *, const char *);
521 void vfs_setmntopt(struct vfs *, const char *, const char *, int);
522 void vfs_setresource(struct vfs *, const char *, uint32_t);
523 void vfs_setmntpoint(struct vfs *, const char *, uint32_t);
524 refstr_t *vfs_getresource(const struct vfs *);
525 refstr_t *vfs_getmntpoint(const struct vfs *);
526 int vfs_optionisset(const struct vfs *, const char *, char **);
527 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *);
528 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *);
529 void vfs_syncall(void);
530 void vfs_syncprogress(void);
531 void vfsinit(void);
532 void vfs_unmountall(void);
533 void vfs_make_fsid(fsid_t *, dev_t, int);
534 void vfs_addmip(dev_t, struct vfs *);
535 void vfs_delmip(struct vfs *);
536 int vfs_devismounted(dev_t);
537 int vfs_devmounting(dev_t, struct vfs *);
538 int vfs_opsinuse(vfsops_t *);
539 struct vfs *getvfs(fsid_t *);
540 struct vfs *vfs_dev2vfsp(dev_t);
541 struct vfs *vfs_mntpoint2vfsp(const char *);
542 struct vfssw *allocate_vfssw(const char *);
543 struct vfssw *vfs_getvfssw(const char *);
544 struct vfssw *vfs_getvfsswbyname(const char *);
545 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *);
546 void vfs_refvfssw(struct vfssw *);
547 void vfs_unrefvfssw(struct vfssw *);
548 uint_t vf_to_stf(uint_t);
549 void vfs_mnttab_modtime(timespec_t *);
550 void vfs_mnttab_poll(timespec_t *, struct pollhead **);
551
552 void vfs_list_lock(void);
553 void vfs_list_read_lock(void);
554 void vfs_list_unlock(void);
555 void vfs_list_add(struct vfs *);
556 void vfs_list_remove(struct vfs *);
557 void vfs_hold(vfs_t *vfsp);
558 void vfs_rele(vfs_t *vfsp);
559 void fs_freevfs(vfs_t *);
560 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype);
561
562 int vfs_zone_change_safe(vfs_t *);
563
564 int vfs_get_lofi(vfs_t *, vnode_t **);
565
566 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1))
567 #define VFS_ON_LIST(vfsp) \
568 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL)
569
570 /*
571 * Globals.
572 */
573
574 extern struct vfssw vfssw[]; /* table of filesystem types */
575 extern krwlock_t vfssw_lock;
576 extern char rootfstype[]; /* name of root fstype */
577 extern const int nfstype; /* # of elements in vfssw array */
578 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */
579
580 /*
581 * The following variables are private to the the kernel's vfs layer. File
582 * system implementations should not access them.
583 */
584 extern struct vfs *rootvfs; /* ptr to root vfs structure */
585 typedef struct {
586 struct vfs *rvfs_head; /* head vfs in chain */
587 kmutex_t rvfs_lock; /* mutex protecting this chain */
588 uint32_t rvfs_len; /* length of this chain */
589 } rvfs_t;
590 extern rvfs_t *rvfs_list;
591 extern int vfshsz; /* # of elements in rvfs_head array */
592 extern const mntopts_t vfs_mntopts; /* globally recognized options */
593
594 #endif /* defined(_KERNEL) */
595
596 #define VFS_HOLD(vfsp) { \
597 vfs_hold(vfsp); \
598 }
599
600 #define VFS_RELE(vfsp) { \
601 vfs_rele(vfsp); \
602 }
603
604 #define VFS_INIT(vfsp, op, data) { \
605 vfs_init((vfsp), (op), (data)); \
606 }
607
608
609 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0)
610 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0')
611 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER))
612 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock))
613 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER))
614 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock))
615 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock))
616 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock))
617 /*
618 * VFS_SYNC flags.
619 */
620 #define SYNC_ATTR 0x01 /* sync attributes only */
621 #define SYNC_CLOSE 0x02 /* close open file */
622 #define SYNC_ALL 0x04 /* force to sync all fs */
623
624 #ifdef __cplusplus
625 }
626 #endif
627
628 #endif /* _SYS_VFS_H */