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 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 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 #pragma ident "%Z%%M% %I% %E% SMI" 38 39 #include <sys/types.h> 40 #include <sys/t_lock.h> 41 #include <sys/cred.h> 42 #include <sys/vnode.h> 43 #include <sys/statvfs.h> 44 #include <sys/refstr.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 fem_head *vfs_femhead; /* fs monitoring */ 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 * Support for statistics on the vnode operations 237 */ 238 vsk_anchor_t *vfs_vskap; /* anchor for vopstats' kstat */ 239 vopstats_t *vfs_fstypevsp; /* ptr to per-fstype vopstats */ 240 vopstats_t vfs_vopstats; /* per-mount vnode op stats */ 241 } vfs_t; 242 243 /* 244 * VFS flags. 245 */ 246 #define VFS_RDONLY 0x01 /* read-only vfs */ 247 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */ 248 #define VFS_NOSETUID 0x08 /* setuid disallowed */ 249 #define VFS_REMOUNT 0x10 /* modify mount options only */ 250 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */ 251 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */ 252 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */ 253 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */ 254 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */ 255 #define VFS_XATTR 0x400 /* fs supports extended attributes */ 256 #define VFS_NODEVICES 0x800 /* device-special files disallowed */ 257 #define VFS_NOEXEC 0x1000 /* executables disallowed */ 258 #define VFS_STATS 0x2000 /* file system can collect stats */ 259 260 #define VFS_NORESOURCE "unspecified_resource" 261 #define VFS_NOMNTPT "unspecified_mountpoint" 262 263 /* 264 * Argument structure for mount(2). 265 * 266 * Flags are defined in <sys/mount.h>. 267 * 268 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in 269 * this structure are to be interpreted as kernel addresses. File systems 270 * should be prepared for this possibility. 271 */ 272 struct mounta { 273 char *spec; 274 char *dir; 275 int flags; 276 char *fstype; 277 char *dataptr; 278 int datalen; 279 char *optptr; 280 int optlen; 281 }; 282 283 /* 284 * Reasons for calling the vfs_mountroot() operation. 285 */ 286 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT}; 287 typedef enum whymountroot whymountroot_t; 288 289 /* 290 * Reasons for calling the VFS_VNSTATE(): 291 */ 292 enum vntrans { 293 VNTRANS_EXISTS, 294 VNTRANS_IDLED, 295 VNTRANS_RECLAIMED, 296 VNTRANS_DESTROYED 297 }; 298 typedef enum vntrans vntrans_t; 299 300 301 /* 302 * Operations supported on virtual file system. 303 */ 304 struct vfsops { 305 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); 306 int (*vfs_unmount)(vfs_t *, int, cred_t *); 307 int (*vfs_root)(vfs_t *, vnode_t **); 308 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); 309 int (*vfs_sync)(vfs_t *, short, cred_t *); 310 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); 311 int (*vfs_mountroot)(vfs_t *, enum whymountroot); 312 int (*vfs_freevfs)(vfs_t *); 313 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t); 314 }; 315 316 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *); 317 extern int fsop_unmount(vfs_t *, int, cred_t *); 318 extern int fsop_root(vfs_t *, vnode_t **); 319 extern int fsop_statfs(vfs_t *, statvfs64_t *); 320 extern int fsop_sync(vfs_t *, short, cred_t *); 321 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *); 322 extern int fsop_mountroot(vfs_t *, enum whymountroot); 323 extern void fsop_freefs(vfs_t *); 324 extern int fsop_sync_by_kind(int, short, cred_t *); 325 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t); 326 327 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr) 328 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr) 329 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp) 330 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp) 331 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr) 332 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp) 333 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init) 334 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp) 335 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns) 336 337 #define VFSNAME_MOUNT "mount" 338 #define VFSNAME_UNMOUNT "unmount" 339 #define VFSNAME_ROOT "root" 340 #define VFSNAME_STATVFS "statvfs" 341 #define VFSNAME_SYNC "sync" 342 #define VFSNAME_VGET "vget" 343 #define VFSNAME_MOUNTROOT "mountroot" 344 #define VFSNAME_FREEVFS "freevfs" 345 #define VFSNAME_VNSTATE "vnstate" 346 /* 347 * Filesystem type switch table. 348 */ 349 350 typedef struct vfssw { 351 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */ 352 int (*vsw_init) (int, char *); 353 /* init routine (for non-loadable fs only) */ 354 int vsw_flag; /* flags */ 355 mntopts_t vsw_optproto; /* mount options table prototype */ 356 uint_t vsw_count; /* count of references */ 357 kmutex_t vsw_lock; /* lock to protect vsw_count */ 358 vfsops_t vsw_vfsops; /* filesystem operations vector */ 359 } vfssw_t; 360 361 /* 362 * Filesystem type definition record. All file systems must export a record 363 * of this type through their modlfs structure. 364 */ 365 366 typedef struct vfsdef_v3 { 367 int def_version; /* structure version, must be first */ 368 char *name; /* filesystem type name */ 369 int (*init) (int, char *); /* init routine */ 370 int flags; /* filesystem flags */ 371 mntopts_t *optproto; /* mount options table prototype */ 372 } vfsdef_v3; 373 374 typedef struct vfsdef_v3 vfsdef_t; 375 376 enum { 377 VFSDEF_VERSION = 3 378 }; 379 380 /* 381 * Generic operations vector types (used for vfs/vnode ops registration). 382 */ 383 384 extern int fs_default(); /* "default" function placeholder */ 385 extern int fs_error(); /* "error" function placeholder */ 386 387 int fs_build_vector(void *vector, int *unused_ops, 388 const fs_operation_trans_def_t *translation, 389 const fs_operation_def_t *operations); 390 391 /* 392 * flags for vfssw and vfsdef 393 */ 394 #define VSW_HASPROTO 0x01 /* struct has a mount options prototype */ 395 #define VSW_CANRWRO 0x02 /* file system can transition from rw to ro */ 396 #define VSW_CANREMOUNT 0x04 /* file system supports remounts */ 397 #define VSW_NOTZONESAFE 0x08 /* zone_enter(2) should fail for these files */ 398 #define VSW_VOLATILEDEV 0x10 /* vfs_dev can change each time fs is mounted */ 399 #define VSW_STATS 0x20 /* file system can collect stats */ 400 401 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */ 402 403 #if defined(_KERNEL) 404 /* 405 * Public operations. 406 */ 407 struct umounta; 408 struct statvfsa; 409 struct fstatvfsa; 410 411 int vfs_setfsops(int, const fs_operation_def_t *, vfsops_t **); 412 int vfs_makefsops(const fs_operation_def_t *, vfsops_t **); 413 void vfs_freevfsops(vfsops_t *); 414 int vfs_freevfsops_by_type(int); 415 void vfs_setops(vfs_t *, vfsops_t *); 416 vfsops_t *vfs_getops(vfs_t *vfsp); 417 int vfs_matchops(vfs_t *, vfsops_t *); 418 int vfs_can_sync(vfs_t *vfsp); 419 void vfs_init(vfs_t *vfsp, vfsops_t *, void *); 420 void vn_exists(vnode_t *); 421 void vn_idle(vnode_t *); 422 void vn_reclaim(vnode_t *); 423 void vn_invalid(vnode_t *); 424 425 int rootconf(void); 426 int svm_rootconf(void); 427 int domount(char *, struct mounta *, vnode_t *, struct cred *, 428 struct vfs **); 429 int dounmount(struct vfs *, int, cred_t *); 430 int vfs_lock(struct vfs *); 431 int vfs_rlock(struct vfs *); 432 void vfs_lock_wait(struct vfs *); 433 void vfs_rlock_wait(struct vfs *); 434 void vfs_unlock(struct vfs *); 435 int vfs_lock_held(struct vfs *); 436 struct _kthread *vfs_lock_owner(struct vfs *); 437 void sync(void); 438 void vfs_sync(int); 439 void vfs_mountroot(void); 440 void vfs_add(vnode_t *, struct vfs *, int); 441 void vfs_remove(struct vfs *); 442 443 /* The following functions are not for general use by filesystems */ 444 445 void vfs_createopttbl(mntopts_t *, const char *); 446 void vfs_copyopttbl(const mntopts_t *, mntopts_t *); 447 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *); 448 void vfs_freeopttbl(mntopts_t *); 449 void vfs_parsemntopts(mntopts_t *, char *, int); 450 int vfs_buildoptionstr(const mntopts_t *, char *, int); 451 struct mntopt *vfs_hasopt(const mntopts_t *, const char *); 452 void vfs_mnttab_modtimeupd(void); 453 454 void vfs_clearmntopt(struct vfs *, const char *); 455 void vfs_setmntopt(struct vfs *, const char *, const char *, int); 456 void vfs_setresource(struct vfs *, const char *); 457 void vfs_setmntpoint(struct vfs *, const char *); 458 refstr_t *vfs_getresource(const struct vfs *); 459 refstr_t *vfs_getmntpoint(const struct vfs *); 460 int vfs_optionisset(const struct vfs *, const char *, char **); 461 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *); 462 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *); 463 void vfs_syncall(void); 464 void vfs_syncprogress(void); 465 void vfsinit(void); 466 void vfs_unmountall(void); 467 void vfs_make_fsid(fsid_t *, dev_t, int); 468 void vfs_addmip(dev_t, struct vfs *); 469 void vfs_delmip(struct vfs *); 470 int vfs_devismounted(dev_t); 471 int vfs_devmounting(dev_t, struct vfs *); 472 int vfs_opsinuse(vfsops_t *); 473 struct vfs *getvfs(fsid_t *); 474 struct vfs *vfs_dev2vfsp(dev_t); 475 struct vfs *vfs_mntpoint2vfsp(const char *); 476 struct vfssw *allocate_vfssw(char *); 477 struct vfssw *vfs_getvfssw(char *); 478 struct vfssw *vfs_getvfsswbyname(char *); 479 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *); 480 void vfs_refvfssw(struct vfssw *); 481 void vfs_unrefvfssw(struct vfssw *); 482 uint_t vf_to_stf(uint_t); 483 void vfs_mnttab_modtime(timespec_t *); 484 void vfs_mnttab_poll(timespec_t *, struct pollhead **); 485 486 void vfs_list_lock(void); 487 void vfs_list_read_lock(void); 488 void vfs_list_unlock(void); 489 void vfs_list_add(struct vfs *); 490 void vfs_list_remove(struct vfs *); 491 void vfs_hold(vfs_t *vfsp); 492 void vfs_rele(vfs_t *vfsp); 493 void fs_freevfs(vfs_t *); 494 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype); 495 496 int vfs_zone_change_safe(vfs_t *); 497 498 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1)) 499 #define VFS_ON_LIST(vfsp) \ 500 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL) 501 502 /* 503 * Globals. 504 */ 505 506 extern struct vfssw vfssw[]; /* table of filesystem types */ 507 extern krwlock_t vfssw_lock; 508 extern char rootfstype[]; /* name of root fstype */ 509 extern const int nfstype; /* # of elements in vfssw array */ 510 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */ 511 512 /* 513 * The following variables are private to the the kernel's vfs layer. File 514 * system implementations should not access them. 515 */ 516 extern struct vfs *rootvfs; /* ptr to root vfs structure */ 517 typedef struct { 518 struct vfs *rvfs_head; /* head vfs in chain */ 519 kmutex_t rvfs_lock; /* mutex protecting this chain */ 520 uint32_t rvfs_len; /* length of this chain */ 521 } rvfs_t; 522 extern rvfs_t *rvfs_list; 523 extern int vfshsz; /* # of elements in rvfs_head array */ 524 extern const mntopts_t vfs_mntopts; /* globally recognized options */ 525 526 #endif /* defined(_KERNEL) */ 527 528 #define VFS_HOLD(vfsp) { \ 529 vfs_hold(vfsp); \ 530 } 531 532 #define VFS_RELE(vfsp) { \ 533 vfs_rele(vfsp); \ 534 } 535 536 #define VFS_INIT(vfsp, op, data) vfs_init((vfsp), (op), (data)) 537 538 #define _VFS_INIT(vfsp, op, data) { \ 539 (vfsp)->vfs_count = 0; \ 540 (vfsp)->vfs_next = vfsp; \ 541 (vfsp)->vfs_prev = vfsp; \ 542 (vfsp)->vfs_zone_next = vfsp; \ 543 (vfsp)->vfs_zone_prev = vfsp; \ 544 vfs_setops((vfsp), (op)); \ 545 (vfsp)->vfs_flag = 0; \ 546 (vfsp)->vfs_data = (data); \ 547 (vfsp)->vfs_resource = NULL; \ 548 (vfsp)->vfs_mntpt = NULL; \ 549 (vfsp)->vfs_mntopts.mo_count = 0; \ 550 (vfsp)->vfs_mntopts.mo_list = NULL; \ 551 (vfsp)->vfs_femhead = NULL; \ 552 (vfsp)->vfs_zone = NULL; \ 553 sema_init(&(vfsp)->vfs_reflock, 1, NULL, SEMA_DEFAULT, NULL); \ 554 } 555 556 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0) 557 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0') 558 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER)) 559 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 560 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER)) 561 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 562 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock)) 563 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock)) 564 /* 565 * VFS_SYNC flags. 566 */ 567 #define SYNC_ATTR 0x01 /* sync attributes only */ 568 #define SYNC_CLOSE 0x02 /* close open file */ 569 #define SYNC_ALL 0x04 /* force to sync all fs */ 570 571 #ifdef __cplusplus 572 } 573 #endif 574 575 #endif /* _SYS_VFS_H */ 576