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
202 typedef struct vfs {
203 struct vfs *vfs_next; /* next VFS in VFS list */
204 struct vfs *vfs_prev; /* prev VFS in VFS list */
205
206 /* vfs_op should not be used directly. Accessor functions are provided */
207 vfsops_t *vfs_op; /* operations on VFS */
208
209 struct vnode *vfs_vnodecovered; /* vnode mounted on */
210 uint_t vfs_flag; /* flags */
211 uint_t vfs_bsize; /* native block size */
212 int vfs_fstype; /* file system type index */
213 fsid_t vfs_fsid; /* file system id */
214 void *vfs_data; /* private data */
215 dev_t vfs_dev; /* device of mounted VFS */
216 ulong_t vfs_bcount; /* I/O count (accounting) */
217 struct vfs *vfs_list; /* sync list pointer */
218 struct vfs *vfs_hash; /* hash list pointer */
219 ksema_t vfs_reflock; /* mount/unmount/sync lock */
220 uint_t vfs_count; /* vfs reference count */
221 mntopts_t vfs_mntopts; /* options mounted with */
222 refstr_t *vfs_resource; /* mounted resource name */
223 refstr_t *vfs_mntpt; /* mount point name */
224 time_t vfs_mtime; /* time we were mounted */
225 struct vfs_impl *vfs_implp; /* impl specific data */
226 /*
227 * Zones support. Note that the zone that "owns" the mount isn't
228 * necessarily the same as the zone in which the zone is visible.
229 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to
230 * different zones.
231 */
232 struct zone *vfs_zone; /* zone that owns the mount */
233 struct vfs *vfs_zone_next; /* next VFS visible in zone */
234 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */
235
236 struct fem_head *vfs_femhead; /* fs monitoring */
237 minor_t vfs_lofi_minor; /* minor if lofi mount */
238 } vfs_t;
239
240 #define vfs_featureset vfs_implp->vi_featureset
241 #define vfs_vskap vfs_implp->vi_vskap
242 #define vfs_fstypevsp vfs_implp->vi_fstypevsp
243 #define vfs_vopstats vfs_implp->vi_vopstats
244 #define vfs_hrctime vfs_implp->vi_hrctime
245
246 /*
247 * VFS flags.
248 */
249 #define VFS_RDONLY 0x01 /* read-only vfs */
250 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */
251 #define VFS_NOSETUID 0x08 /* setuid disallowed */
252 #define VFS_REMOUNT 0x10 /* modify mount options only */
253 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */
254 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */
255 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */
256 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */
257 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */
258 #define VFS_XATTR 0x400 /* fs supports extended attributes */
259 #define VFS_NODEVICES 0x800 /* device-special files disallowed */
260 #define VFS_NOEXEC 0x1000 /* executables disallowed */
261 #define VFS_STATS 0x2000 /* file system can collect stats */
262 #define VFS_XID 0x4000 /* file system supports extended ids */
263
264 #define VFS_NORESOURCE "unspecified_resource"
265 #define VFS_NOMNTPT "unspecified_mountpoint"
266
267 /*
268 * VFS features are implemented as bits set in the vfs_t.
269 * The vfs_feature_t typedef is a 64-bit number that will translate
270 * into an element in an array of bitmaps and a bit in that element.
271 * Developers must not depend on the implementation of this and
272 * need to use vfs_has_feature()/vfs_set_feature() routines.
273 */
274 typedef uint64_t vfs_feature_t;
275
276 #define VFSFT_XVATTR 0x100000001 /* Supports xvattr for attrs */
277 #define VFSFT_CASEINSENSITIVE 0x100000002 /* Supports case-insensitive */
278 #define VFSFT_NOCASESENSITIVE 0x100000004 /* NOT case-sensitive */
279 #define VFSFT_DIRENTFLAGS 0x100000008 /* Supports dirent flags */
280 #define VFSFT_ACLONCREATE 0x100000010 /* Supports ACL on create */
281 #define VFSFT_ACEMASKONACCESS 0x100000020 /* Can use ACEMASK for access */
282 #define VFSFT_SYSATTR_VIEWS 0x100000040 /* Supports sysattr view i/f */
283 #define VFSFT_ACCESS_FILTER 0x100000080 /* dirents filtered by access */
284 #define VFSFT_REPARSE 0x100000100 /* Supports reparse point */
285 #define VFSFT_ZEROCOPY_SUPPORTED 0x100000200
286 /* Support loaning /returning cache buffer */
287 /*
288 * Argument structure for mount(2).
289 *
290 * Flags are defined in <sys/mount.h>.
291 *
292 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in
293 * this structure are to be interpreted as kernel addresses. File systems
294 * should be prepared for this possibility.
295 */
296 struct mounta {
297 char *spec;
298 char *dir;
299 int flags;
300 char *fstype;
301 char *dataptr;
302 int datalen;
303 char *optptr;
304 int optlen;
305 };
306
307 /*
308 * Reasons for calling the vfs_mountroot() operation.
309 */
310 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT};
311 typedef enum whymountroot whymountroot_t;
312
313 /*
314 * Reasons for calling the VFS_VNSTATE():
315 */
316 enum vntrans {
317 VNTRANS_EXISTS,
318 VNTRANS_IDLED,
319 VNTRANS_RECLAIMED,
320 VNTRANS_DESTROYED
321 };
322 typedef enum vntrans vntrans_t;
323
324 /*
325 * VFS_OPS defines all the vfs operations. It is used to define
326 * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h).
327 */
328 #define VFS_OPS \
329 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \
330 int (*vfs_unmount)(vfs_t *, int, cred_t *); \
331 int (*vfs_root)(vfs_t *, vnode_t **); \
332 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); \
333 int (*vfs_sync)(vfs_t *, short, cred_t *); \
334 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); \
335 int (*vfs_mountroot)(vfs_t *, enum whymountroot); \
336 void (*vfs_freevfs)(vfs_t *); \
337 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t) /* NB: No ";" */
338
339 /*
340 * Operations supported on virtual file system.
341 */
342 struct vfsops {
343 VFS_OPS; /* Signature of all vfs operations (vfsops) */
344 };
345
346 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *);
347 extern int fsop_unmount(vfs_t *, int, cred_t *);
348 extern int fsop_root(vfs_t *, vnode_t **);
349 extern int fsop_statfs(vfs_t *, statvfs64_t *);
350 extern int fsop_sync(vfs_t *, short, cred_t *);
351 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *);
352 extern int fsop_mountroot(vfs_t *, enum whymountroot);
353 extern void fsop_freefs(vfs_t *);
354 extern int fsop_sync_by_kind(int, short, cred_t *);
355 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t);
356
357 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr)
358 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr)
359 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp)
360 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp)
361 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr)
362 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp)
363 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init)
364 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp)
365 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns)
366
367 #define VFSNAME_MOUNT "mount"
368 #define VFSNAME_UNMOUNT "unmount"
369 #define VFSNAME_ROOT "root"
370 #define VFSNAME_STATVFS "statvfs"
371 #define VFSNAME_SYNC "sync"
372 #define VFSNAME_VGET "vget"
373 #define VFSNAME_MOUNTROOT "mountroot"
374 #define VFSNAME_FREEVFS "freevfs"
375 #define VFSNAME_VNSTATE "vnstate"
376 /*
377 * Filesystem type switch table.
378 */
379
380 typedef struct vfssw {
381 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */
382 int (*vsw_init) (int, char *);
383 /* init routine (for non-loadable fs only) */
384 int vsw_flag; /* flags */
385 mntopts_t vsw_optproto; /* mount options table prototype */
386 uint_t vsw_count; /* count of references */
387 kmutex_t vsw_lock; /* lock to protect vsw_count */
388 vfsops_t vsw_vfsops; /* filesystem operations vector */
389 } vfssw_t;
390
391 /*
392 * Filesystem type definition record. All file systems must export a record
393 * of this type through their modlfs structure. N.B., changing the version
394 * number requires a change in sys/modctl.h.
395 */
396
397 typedef struct vfsdef_v5 {
398 int def_version; /* structure version, must be first */
399 char *name; /* filesystem type name */
400 int (*init) (int, char *); /* init routine */
401 int flags; /* filesystem flags */
402 mntopts_t *optproto; /* mount options table prototype */
403 } vfsdef_v5;
404
405 typedef struct vfsdef_v5 vfsdef_t;
406
407 enum {
408 VFSDEF_VERSION = 5
409 };
410
411 /*
412 * flags for vfssw and vfsdef
413 */
414 #define VSW_HASPROTO 0x01 /* struct has a mount options prototype */
415 #define VSW_CANRWRO 0x02 /* file system can transition from rw to ro */
416 #define VSW_CANREMOUNT 0x04 /* file system supports remounts */
417 #define VSW_NOTZONESAFE 0x08 /* zone_enter(2) should fail for these files */
418 #define VSW_VOLATILEDEV 0x10 /* vfs_dev can change each time fs is mounted */
419 #define VSW_STATS 0x20 /* file system can collect stats */
420 #define VSW_XID 0x40 /* file system supports extended ids */
421 #define VSW_CANLOFI 0x80 /* file system supports lofi mounts */
422 #define VSW_ZMOUNT 0x100 /* file system always allowed in a zone */
423
424 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */
425
426 /*
427 * A flag for vfs_setpath().
428 */
429 #define VFSSP_VERBATIM 0x1 /* do not prefix the supplied path */
430
431 #if defined(_KERNEL)
432
433 /*
434 * Private vfs data, NOT to be used by a file system implementation.
435 */
436
437 #define VFS_FEATURE_MAXSZ 4
438
439 typedef struct vfs_impl {
440 /* Counted array - Bitmap of vfs features */
441 uint32_t vi_featureset[VFS_FEATURE_MAXSZ];
442 /*
443 * Support for statistics on the vnode operations
444 */
445 vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */
446 vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */
447 vopstats_t vi_vopstats; /* per-mount vnode op stats */
448
449 timespec_t vi_hrctime; /* High-res creation time */
450
451 zone_ref_t vi_zone_ref; /* reference to zone */
452 } vfs_impl_t;
453
454 /*
455 * Public operations.
456 */
457 struct umounta;
458 struct statvfsa;
459 struct fstatvfsa;
460
461 void vfs_freevfsops(vfsops_t *);
462 int vfs_freevfsops_by_type(int);
463 void vfs_setops(vfs_t *, vfsops_t *);
464 vfsops_t *vfs_getops(vfs_t *vfsp);
465 int vfs_matchops(vfs_t *, vfsops_t *);
466 int vfs_can_sync(vfs_t *vfsp);
467 vfs_t *vfs_alloc(int);
468 void vfs_free(vfs_t *);
469 void vfs_init(vfs_t *vfsp, vfsops_t *, void *);
470 void vfsimpl_setup(vfs_t *vfsp);
471 void vfsimpl_teardown(vfs_t *vfsp);
472 void vn_exists(vnode_t *);
473 void vn_idle(vnode_t *);
474 void vn_reclaim(vnode_t *);
475 void vn_invalid(vnode_t *);
476
477 int rootconf(void);
478 int svm_rootconf(void);
479 int domount(char *, struct mounta *, vnode_t *, struct cred *,
480 struct vfs **);
481 int dounmount(struct vfs *, int, cred_t *);
482 int vfs_lock(struct vfs *);
483 int vfs_rlock(struct vfs *);
484 void vfs_lock_wait(struct vfs *);
485 void vfs_rlock_wait(struct vfs *);
486 void vfs_unlock(struct vfs *);
487 int vfs_lock_held(struct vfs *);
488 struct _kthread *vfs_lock_owner(struct vfs *);
489 void sync(void);
490 void vfs_sync(int);
491 void vfs_mountroot(void);
492 void vfs_add(vnode_t *, struct vfs *, int);
493 void vfs_remove(struct vfs *);
494
495 /* VFS feature routines */
496 void vfs_set_feature(vfs_t *, vfs_feature_t);
497 void vfs_clear_feature(vfs_t *, vfs_feature_t);
498 int vfs_has_feature(vfs_t *, vfs_feature_t);
499 void vfs_propagate_features(vfs_t *, vfs_t *);
500
501 /* The following functions are not for general use by filesystems */
502
503 void vfs_createopttbl(mntopts_t *, const char *);
504 void vfs_copyopttbl(const mntopts_t *, mntopts_t *);
505 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *);
506 void vfs_freeopttbl(mntopts_t *);
507 void vfs_parsemntopts(mntopts_t *, char *, int);
508 int vfs_buildoptionstr(const mntopts_t *, char *, int);
509 struct mntopt *vfs_hasopt(const mntopts_t *, const char *);
510 void vfs_mnttab_modtimeupd(void);
511
512 void vfs_clearmntopt(struct vfs *, const char *);
513 void vfs_setmntopt(struct vfs *, const char *, const char *, int);
514 void vfs_setresource(struct vfs *, const char *, uint32_t);
515 void vfs_setmntpoint(struct vfs *, const char *, uint32_t);
516 refstr_t *vfs_getresource(const struct vfs *);
517 refstr_t *vfs_getmntpoint(const struct vfs *);
518 int vfs_optionisset(const struct vfs *, const char *, char **);
519 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *);
520 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *);
521 void vfs_syncall(void);
522 void vfs_syncprogress(void);
523 void vfsinit(void);
524 void vfs_unmountall(void);
525 void vfs_make_fsid(fsid_t *, dev_t, int);
526 void vfs_addmip(dev_t, struct vfs *);
527 void vfs_delmip(struct vfs *);
528 int vfs_devismounted(dev_t);
529 int vfs_devmounting(dev_t, struct vfs *);
530 int vfs_opsinuse(vfsops_t *);
531 struct vfs *getvfs(fsid_t *);
532 struct vfs *vfs_dev2vfsp(dev_t);
533 struct vfs *vfs_mntpoint2vfsp(const char *);
534 struct vfssw *allocate_vfssw(const char *);
535 struct vfssw *vfs_getvfssw(const char *);
536 struct vfssw *vfs_getvfsswbyname(const char *);
537 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *);
538 void vfs_refvfssw(struct vfssw *);
539 void vfs_unrefvfssw(struct vfssw *);
540 uint_t vf_to_stf(uint_t);
541 void vfs_mnttab_modtime(timespec_t *);
542 void vfs_mnttab_poll(timespec_t *, struct pollhead **);
543
544 void vfs_list_lock(void);
545 void vfs_list_read_lock(void);
546 void vfs_list_unlock(void);
547 void vfs_list_add(struct vfs *);
548 void vfs_list_remove(struct vfs *);
549 void vfs_hold(vfs_t *vfsp);
550 void vfs_rele(vfs_t *vfsp);
551 void fs_freevfs(vfs_t *);
552 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype);
553
554 int vfs_zone_change_safe(vfs_t *);
555
556 int vfs_get_lofi(vfs_t *, vnode_t **);
557
558 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1))
559 #define VFS_ON_LIST(vfsp) \
560 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL)
561
562 /*
563 * Globals.
564 */
565
566 extern struct vfssw vfssw[]; /* table of filesystem types */
567 extern krwlock_t vfssw_lock;
568 extern char rootfstype[]; /* name of root fstype */
569 extern const int nfstype; /* # of elements in vfssw array */
570 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */
571
572 /*
573 * The following variables are private to the the kernel's vfs layer. File
574 * system implementations should not access them.
575 */
576 extern struct vfs *rootvfs; /* ptr to root vfs structure */
577 typedef struct {
578 struct vfs *rvfs_head; /* head vfs in chain */
579 kmutex_t rvfs_lock; /* mutex protecting this chain */
580 uint32_t rvfs_len; /* length of this chain */
581 } rvfs_t;
582 extern rvfs_t *rvfs_list;
583 extern int vfshsz; /* # of elements in rvfs_head array */
584 extern const mntopts_t vfs_mntopts; /* globally recognized options */
585
586 #endif /* defined(_KERNEL) */
587
588 #define VFS_HOLD(vfsp) { \
589 vfs_hold(vfsp); \
590 }
591
592 #define VFS_RELE(vfsp) { \
593 vfs_rele(vfsp); \
594 }
595
596 #define VFS_INIT(vfsp, op, data) { \
597 vfs_init((vfsp), (op), (data)); \
598 }
599
600
601 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0)
602 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0')
603 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER))
604 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock))
605 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER))
606 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock))
607 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock))
608 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock))
609 /*
610 * VFS_SYNC flags.
611 */
612 #define SYNC_ATTR 0x01 /* sync attributes only */
613 #define SYNC_CLOSE 0x02 /* close open file */
614 #define SYNC_ALL 0x04 /* force to sync all fs */
615
616 #ifdef __cplusplus
617 }
618 #endif
619
620 #endif /* _SYS_VFS_H */