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 2015 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 * Many underlying file systems cast a struct fid into other
75 * file system dependent structures which may require 4 byte alignment.
76 * Because a fid starts with a short it may not be 4 byte aligned, the
77 * fid_pad will force the alignment.
78 */
79 #define MAXFIDSZ 64
80 #define OLD_MAXFIDSZ 16
81
82 typedef struct fid {
83 union {
84 long fid_pad;
85 struct {
86 ushort_t len; /* length of data in bytes */
87 char data[MAXFIDSZ]; /* data (variable len) */
88 } _fid;
89 } un;
90 } fid_t;
91
92 #ifdef _SYSCALL32
93 /*
94 * Solaris 64 - use old-style cache format with 32-bit aligned fid for on-disk
95 * struct compatibility.
96 */
97 typedef struct fid32 {
98 union {
99 int32_t fid_pad;
100 struct {
101 uint16_t len; /* length of data in bytes */
102 char data[MAXFIDSZ]; /* data (variable len) */
103 } _fid;
104 } un;
105 } fid32_t;
106 #else /* not _SYSCALL32 */
107 #define fid32 fid
108 typedef fid_t fid32_t;
109 #endif /* _SYSCALL32 */
110
111 #define fid_len un._fid.len
112 #define fid_data un._fid.data
113
114 /*
115 * Structure defining a mount option for a filesystem.
116 * option names are found in mntent.h
117 */
118 typedef struct mntopt {
119 char *mo_name; /* option name */
120 char **mo_cancel; /* list of options cancelled by this one */
121 char *mo_arg; /* argument string for this option */
122 int mo_flags; /* flags for this mount option */
123 void *mo_data; /* filesystem specific data */
124 } mntopt_t;
125
126 /*
127 * Flags that apply to mount options
128 */
129
130 #define MO_SET 0x01 /* option is set */
131 #define MO_NODISPLAY 0x02 /* option not listed in mnttab */
132 #define MO_HASVALUE 0x04 /* option takes a value */
133 #define MO_IGNORE 0x08 /* option ignored by parser */
134 #define MO_DEFAULT MO_SET /* option is on by default */
135 #define MO_TAG 0x10 /* flags a tag set by user program */
136 #define MO_EMPTY 0x20 /* empty space in option table */
137
138 #define VFS_NOFORCEOPT 0x01 /* honor MO_IGNORE (don't set option) */
139 #define VFS_DISPLAY 0x02 /* Turn off MO_NODISPLAY bit for opt */
140 #define VFS_NODISPLAY 0x04 /* Turn on MO_NODISPLAY bit for opt */
141 #define VFS_CREATEOPT 0x08 /* Create the opt if it's not there */
142
143 /*
144 * Structure holding mount option strings for the mounted file system.
145 */
146 typedef struct mntopts {
147 uint_t mo_count; /* number of entries in table */
148 mntopt_t *mo_list; /* list of mount options */
149 } mntopts_t;
150
151 /*
152 * The kstat structures associated with the vopstats are kept in an
153 * AVL tree. This is to avoid the case where a file system does not
154 * use a unique fsid_t for each vfs (e.g., namefs). In order to do
155 * this, we need a structure that the AVL tree can use that also
156 * references the kstat.
157 * Note that the vks_fsid is generated from the value reported by
158 * VFS_STATVFS().
159 */
160 typedef struct vskstat_anchor {
161 avl_node_t vsk_node; /* Required for use by AVL routines */
162 kstat_t *vsk_ksp; /* kstat structure for vopstats */
163 ulong_t vsk_fsid; /* fsid associated w/this FS */
164 } vsk_anchor_t;
165
166 extern avl_tree_t vskstat_tree;
167 extern kmutex_t vskstat_tree_lock;
168
169 /*
170 * Structure per mounted file system. Each mounted file system has
171 * an array of operations and an instance record.
172 *
173 * The file systems are kept on a doubly linked circular list headed by
174 * "rootvfs".
175 * File system implementations should not access this list;
176 * it's intended for use only in the kernel's vfs layer.
177 *
178 * Each zone also has its own list of mounts, containing filesystems mounted
179 * somewhere within the filesystem tree rooted at the zone's rootpath. The
180 * list is doubly linked to match the global list.
181 *
182 * mnttab locking: the in-kernel mnttab uses the vfs_mntpt, vfs_resource and
183 * vfs_mntopts fields in the vfs_t. mntpt and resource are refstr_ts that
184 * are set at mount time and can only be modified during a remount.
185 * It is safe to read these fields if you can prevent a remount on the vfs,
186 * or through the convenience funcs vfs_getmntpoint() and vfs_getresource().
187 * The mntopts field may only be accessed through the provided convenience
188 * functions, as it is protected by the vfs list lock. Modifying a mount
189 * option requires grabbing the vfs list write lock, which can be a very
190 * high latency lock.
191 */
192 struct zone; /* from zone.h */
193 struct fem_head; /* from fem.h */
194
195 typedef struct vfs {
196 struct vfs *vfs_next; /* next VFS in VFS list */
197 struct vfs *vfs_prev; /* prev VFS in VFS list */
198
199 /* vfs_op should not be used directly. Accessor functions are provided */
200 vfsops_t *vfs_op; /* operations on VFS */
201
202 struct vnode *vfs_vnodecovered; /* vnode mounted on */
203 uint_t vfs_flag; /* flags */
204 uint_t vfs_bsize; /* native block size */
205 int vfs_fstype; /* file system type index */
206 fsid_t vfs_fsid; /* file system id */
207 void *vfs_data; /* private data */
208 dev_t vfs_dev; /* device of mounted VFS */
209 ulong_t vfs_bcount; /* I/O count (accounting) */
210 struct vfs *vfs_list; /* sync list pointer */
211 struct vfs *vfs_hash; /* hash list pointer */
212 ksema_t vfs_reflock; /* mount/unmount/sync lock */
213 uint_t vfs_count; /* vfs reference count */
214 mntopts_t vfs_mntopts; /* options mounted with */
215 refstr_t *vfs_resource; /* mounted resource name */
216 refstr_t *vfs_mntpt; /* mount point name */
217 time_t vfs_mtime; /* time we were mounted */
218 struct vfs_impl *vfs_implp; /* impl specific data */
219 /*
220 * Zones support. Note that the zone that "owns" the mount isn't
221 * necessarily the same as the zone in which the zone is visible.
222 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to
223 * different zones.
224 */
225 struct zone *vfs_zone; /* zone that owns the mount */
226 struct vfs *vfs_zone_next; /* next VFS visible in zone */
227 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */
228
229 struct fem_head *vfs_femhead; /* fs monitoring */
230 minor_t vfs_lofi_minor; /* minor if lofi mount */
231 } vfs_t;
232
233 #define vfs_featureset vfs_implp->vi_featureset
234 #define vfs_vskap vfs_implp->vi_vskap
235 #define vfs_fstypevsp vfs_implp->vi_fstypevsp
236 #define vfs_vopstats vfs_implp->vi_vopstats
237 #define vfs_hrctime vfs_implp->vi_hrctime
238
239 /*
240 * VFS flags.
241 */
242 #define VFS_RDONLY 0x01 /* read-only vfs */
243 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */
244 #define VFS_NOSETUID 0x08 /* setuid disallowed */
245 #define VFS_REMOUNT 0x10 /* modify mount options only */
246 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */
247 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */
248 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */
249 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */
250 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */
251 #define VFS_XATTR 0x400 /* fs supports extended attributes */
252 #define VFS_NODEVICES 0x800 /* device-special files disallowed */
253 #define VFS_NOEXEC 0x1000 /* executables disallowed */
254 #define VFS_STATS 0x2000 /* file system can collect stats */
255 #define VFS_XID 0x4000 /* file system supports extended ids */
256
257 #define VFS_NORESOURCE "unspecified_resource"
258 #define VFS_NOMNTPT "unspecified_mountpoint"
259
260 /*
261 * VFS features are implemented as bits set in the vfs_t.
262 * The vfs_feature_t typedef is a 64-bit number that will translate
263 * into an element in an array of bitmaps and a bit in that element.
264 * Developers must not depend on the implementation of this and
265 * need to use vfs_has_feature()/vfs_set_feature() routines.
266 */
267 typedef uint64_t vfs_feature_t;
268
269 #define VFSFT_XVATTR 0x100000001 /* Supports xvattr for attrs */
270 #define VFSFT_CASEINSENSITIVE 0x100000002 /* Supports case-insensitive */
271 #define VFSFT_NOCASESENSITIVE 0x100000004 /* NOT case-sensitive */
272 #define VFSFT_DIRENTFLAGS 0x100000008 /* Supports dirent flags */
273 #define VFSFT_ACLONCREATE 0x100000010 /* Supports ACL on create */
274 #define VFSFT_ACEMASKONACCESS 0x100000020 /* Can use ACEMASK for access */
275 #define VFSFT_SYSATTR_VIEWS 0x100000040 /* Supports sysattr view i/f */
276 #define VFSFT_ACCESS_FILTER 0x100000080 /* dirents filtered by access */
277 #define VFSFT_REPARSE 0x100000100 /* Supports reparse point */
278 #define VFSFT_ZEROCOPY_SUPPORTED 0x100000200
279 /* Support loaning /returning cache buffer */
280 /*
281 * Argument structure for mount(2).
282 *
283 * Flags are defined in <sys/mount.h>.
284 *
285 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in
286 * this structure are to be interpreted as kernel addresses. File systems
287 * should be prepared for this possibility.
288 */
289 struct mounta {
290 char *spec;
291 char *dir;
292 int flags;
293 char *fstype;
294 char *dataptr;
295 int datalen;
296 char *optptr;
297 int optlen;
298 };
299
300 /*
301 * Reasons for calling the vfs_mountroot() operation.
302 */
303 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT};
304 typedef enum whymountroot whymountroot_t;
305
306 /*
307 * Reasons for calling the VFS_VNSTATE():
308 */
309 enum vntrans {
310 VNTRANS_EXISTS,
311 VNTRANS_IDLED,
312 VNTRANS_RECLAIMED,
313 VNTRANS_DESTROYED
314 };
315 typedef enum vntrans vntrans_t;
316
317 /*
318 * VFS_OPS defines all the vfs operations. It is used to define
319 * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h).
320 */
321 #define VFS_OPS \
322 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \
323 int (*vfs_unmount)(vfs_t *, int, cred_t *); \
324 int (*vfs_root)(vfs_t *, vnode_t **); \
325 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); \
326 int (*vfs_sync)(vfs_t *, short, cred_t *); \
327 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); \
328 int (*vfs_mountroot)(vfs_t *, enum whymountroot); \
329 void (*vfs_freevfs)(vfs_t *); \
330 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t) /* NB: No ";" */
331
332 /*
333 * Operations supported on virtual file system.
334 */
335 struct vfsops {
336 VFS_OPS; /* Signature of all vfs operations (vfsops) */
337 };
338
339 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *);
340 extern int fsop_unmount(vfs_t *, int, cred_t *);
341 extern int fsop_root(vfs_t *, vnode_t **);
342 extern int fsop_statfs(vfs_t *, statvfs64_t *);
343 extern int fsop_sync(vfs_t *, short, cred_t *);
344 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *);
345 extern int fsop_mountroot(vfs_t *, enum whymountroot);
346 extern void fsop_freefs(vfs_t *);
347 extern int fsop_sync_by_kind(int, short, cred_t *);
348 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t);
349
350 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr)
351 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr)
352 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp)
353 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp)
354 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr)
355 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp)
356 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init)
357 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp)
358 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns)
359
360 #define VFSNAME_MOUNT "mount"
361 #define VFSNAME_UNMOUNT "unmount"
362 #define VFSNAME_ROOT "root"
363 #define VFSNAME_STATVFS "statvfs"
364 #define VFSNAME_SYNC "sync"
365 #define VFSNAME_VGET "vget"
366 #define VFSNAME_MOUNTROOT "mountroot"
367 #define VFSNAME_FREEVFS "freevfs"
368 #define VFSNAME_VNSTATE "vnstate"
369 /*
370 * Filesystem type switch table.
371 */
372
373 typedef struct vfssw {
374 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */
375 int (*vsw_init) (int, char *);
376 /* init routine (for non-loadable fs only) */
377 int vsw_flag; /* flags */
378 mntopts_t vsw_optproto; /* mount options table prototype */
379 uint_t vsw_count; /* count of references */
380 kmutex_t vsw_lock; /* lock to protect vsw_count */
381 vfsops_t vsw_vfsops; /* filesystem operations vector */
382 } vfssw_t;
383
384 /*
385 * Filesystem type definition record. All file systems must export a record
386 * of this type through their modlfs structure. N.B., changing the version
387 * number requires a change in sys/modctl.h.
388 */
389
390 typedef struct vfsdef_v5 {
391 int def_version; /* structure version, must be first */
392 char *name; /* filesystem type name */
393 int (*init) (int, char *); /* init routine */
394 int flags; /* filesystem flags */
395 mntopts_t *optproto; /* mount options table prototype */
396 } vfsdef_v5;
397
398 typedef struct vfsdef_v5 vfsdef_t;
399
400 enum {
401 VFSDEF_VERSION = 5
402 };
403
404 /*
405 * flags for vfssw and vfsdef
406 */
407 #define VSW_HASPROTO 0x01 /* struct has a mount options prototype */
408 #define VSW_CANRWRO 0x02 /* file system can transition from rw to ro */
409 #define VSW_CANREMOUNT 0x04 /* file system supports remounts */
410 #define VSW_NOTZONESAFE 0x08 /* zone_enter(2) should fail for these files */
411 #define VSW_VOLATILEDEV 0x10 /* vfs_dev can change each time fs is mounted */
412 #define VSW_STATS 0x20 /* file system can collect stats */
413 #define VSW_XID 0x40 /* file system supports extended ids */
414 #define VSW_CANLOFI 0x80 /* file system supports lofi mounts */
415 #define VSW_ZMOUNT 0x100 /* file system always allowed in a zone */
416
417 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */
418
419 /*
420 * A flag for vfs_setpath().
421 */
422 #define VFSSP_VERBATIM 0x1 /* do not prefix the supplied path */
423
424 #if defined(_KERNEL) || defined(_FAKE_KERNEL)
425
426 /*
427 * Private vfs data, NOT to be used by a file system implementation.
428 */
429
430 #define VFS_FEATURE_MAXSZ 4
431
432 typedef struct vfs_impl {
433 /* Counted array - Bitmap of vfs features */
434 uint32_t vi_featureset[VFS_FEATURE_MAXSZ];
435 /*
436 * Support for statistics on the vnode operations
437 */
438 vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */
439 vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */
440 vopstats_t vi_vopstats; /* per-mount vnode op stats */
441
442 timespec_t vi_hrctime; /* High-res creation time */
443
444 zone_ref_t vi_zone_ref; /* reference to zone */
445 } vfs_impl_t;
446
447 /*
448 * Public operations.
449 */
450 struct umounta;
451 struct statvfsa;
452 struct fstatvfsa;
453
454 void vfs_freevfsops(vfsops_t *);
455 int vfs_freevfsops_by_type(int);
456 void vfs_setops(vfs_t *, vfsops_t *);
457 vfsops_t *vfs_getops(vfs_t *vfsp);
458 int vfs_matchops(vfs_t *, vfsops_t *);
459 int vfs_can_sync(vfs_t *vfsp);
460 vfs_t *vfs_alloc(int);
461 void vfs_free(vfs_t *);
462 void vfs_init(vfs_t *vfsp, vfsops_t *, void *);
463 void vfsimpl_setup(vfs_t *vfsp);
464 void vfsimpl_teardown(vfs_t *vfsp);
465 void vn_exists(vnode_t *);
466 void vn_idle(vnode_t *);
467 void vn_reclaim(vnode_t *);
468 void vn_invalid(vnode_t *);
469
470 int rootconf(void);
471 int svm_rootconf(void);
472 int domount(char *, struct mounta *, vnode_t *, struct cred *,
473 struct vfs **);
474 int dounmount(struct vfs *, int, cred_t *);
475 int vfs_lock(struct vfs *);
476 int vfs_rlock(struct vfs *);
477 void vfs_lock_wait(struct vfs *);
478 void vfs_rlock_wait(struct vfs *);
479 void vfs_unlock(struct vfs *);
480 int vfs_lock_held(struct vfs *);
481 struct _kthread *vfs_lock_owner(struct vfs *);
482 void sync(void);
483 void vfs_sync(int);
484 void vfs_mountroot(void);
485 void vfs_add(vnode_t *, struct vfs *, int);
486 void vfs_remove(struct vfs *);
487
488 /* VFS feature routines */
489 void vfs_set_feature(vfs_t *, vfs_feature_t);
490 void vfs_clear_feature(vfs_t *, vfs_feature_t);
491 int vfs_has_feature(vfs_t *, vfs_feature_t);
492 void vfs_propagate_features(vfs_t *, vfs_t *);
493
494 /* The following functions are not for general use by filesystems */
495
496 void vfs_createopttbl(mntopts_t *, const char *);
497 void vfs_copyopttbl(const mntopts_t *, mntopts_t *);
498 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *);
499 void vfs_freeopttbl(mntopts_t *);
500 void vfs_parsemntopts(mntopts_t *, char *, int);
501 int vfs_buildoptionstr(const mntopts_t *, char *, int);
502 struct mntopt *vfs_hasopt(const mntopts_t *, const char *);
503 void vfs_mnttab_modtimeupd(void);
504
505 void vfs_clearmntopt(struct vfs *, const char *);
506 void vfs_setmntopt(struct vfs *, const char *, const char *, int);
507 void vfs_setresource(struct vfs *, const char *, uint32_t);
508 void vfs_setmntpoint(struct vfs *, const char *, uint32_t);
509 refstr_t *vfs_getresource(const struct vfs *);
510 refstr_t *vfs_getmntpoint(const struct vfs *);
511 int vfs_optionisset(const struct vfs *, const char *, char **);
512 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *);
513 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *);
514 void vfs_syncall(void);
515 void vfs_syncprogress(void);
516 void vfsinit(void);
517 void vfs_unmountall(void);
518 void vfs_make_fsid(fsid_t *, dev_t, int);
519 void vfs_addmip(dev_t, struct vfs *);
520 void vfs_delmip(struct vfs *);
521 int vfs_devismounted(dev_t);
522 int vfs_devmounting(dev_t, struct vfs *);
523 int vfs_opsinuse(vfsops_t *);
524 struct vfs *getvfs(fsid_t *);
525 struct vfs *vfs_dev2vfsp(dev_t);
526 struct vfs *vfs_mntpoint2vfsp(const char *);
527 struct vfssw *allocate_vfssw(const char *);
528 struct vfssw *vfs_getvfssw(const char *);
529 struct vfssw *vfs_getvfsswbyname(const char *);
530 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *);
531 void vfs_refvfssw(struct vfssw *);
532 void vfs_unrefvfssw(struct vfssw *);
533 uint_t vf_to_stf(uint_t);
534 void vfs_mnttab_modtime(timespec_t *);
535 void vfs_mnttab_poll(timespec_t *, struct pollhead **);
536
537 void vfs_list_lock(void);
538 void vfs_list_read_lock(void);
539 void vfs_list_unlock(void);
540 void vfs_list_add(struct vfs *);
541 void vfs_list_remove(struct vfs *);
542 void vfs_hold(vfs_t *vfsp);
543 void vfs_rele(vfs_t *vfsp);
544 void fs_freevfs(vfs_t *);
545 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype);
546
547 int vfs_zone_change_safe(vfs_t *);
548
549 int vfs_get_lofi(vfs_t *, vnode_t **);
550
551 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1))
552 #define VFS_ON_LIST(vfsp) \
553 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL)
554
555 /*
556 * Globals.
557 */
558
559 extern struct vfssw vfssw[]; /* table of filesystem types */
560 extern krwlock_t vfssw_lock;
561 extern char rootfstype[]; /* name of root fstype */
562 extern const int nfstype; /* # of elements in vfssw array */
563 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */
564
565 /*
566 * The following variables are private to the the kernel's vfs layer. File
567 * system implementations should not access them.
568 */
569 extern struct vfs *rootvfs; /* ptr to root vfs structure */
570 typedef struct {
571 struct vfs *rvfs_head; /* head vfs in chain */
572 kmutex_t rvfs_lock; /* mutex protecting this chain */
573 uint32_t rvfs_len; /* length of this chain */
574 } rvfs_t;
575 extern rvfs_t *rvfs_list;
576 extern int vfshsz; /* # of elements in rvfs_head array */
577 extern const mntopts_t vfs_mntopts; /* globally recognized options */
578
579 #endif /* defined(_KERNEL) */
580
581 #define VFS_HOLD(vfsp) { \
582 vfs_hold(vfsp); \
583 }
584
585 #define VFS_RELE(vfsp) { \
586 vfs_rele(vfsp); \
587 }
588
589 #define VFS_INIT(vfsp, op, data) { \
590 vfs_init((vfsp), (op), (data)); \
591 }
592
593
594 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0)
595 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0')
596 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER))
597 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock))
598 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER))
599 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock))
600 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock))
601 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock))
602 /*
603 * VFS_SYNC flags.
604 */
605 #define SYNC_ATTR 0x01 /* sync attributes only */
606 #define SYNC_CLOSE 0x02 /* close open file */
607 #define SYNC_ALL 0x04 /* force to sync all fs */
608
609 #ifdef __cplusplus
610 }
611 #endif
612
613 #endif /* _SYS_VFS_H */