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 #include <sys/avl.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 /* 204 * Private vfs data, NOT to be used by a file system implementation. 205 */ 206 typedef struct vfs_impl { 207 struct fem_head *vi_femhead; /* fs monitoring */ 208 /* 209 * Support for statistics on the vnode operations 210 */ 211 vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */ 212 vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */ 213 vopstats_t vi_vopstats; /* per-mount vnode op stats */ 214 } vfs_impl_t; 215 216 typedef struct vfs { 217 struct vfs *vfs_next; /* next VFS in VFS list */ 218 struct vfs *vfs_prev; /* prev VFS in VFS list */ 219 220 /* vfs_op should not be used directly. Accessor functions are provided */ 221 vfsops_t *vfs_op; /* operations on VFS */ 222 223 struct vnode *vfs_vnodecovered; /* vnode mounted on */ 224 uint_t vfs_flag; /* flags */ 225 uint_t vfs_bsize; /* native block size */ 226 int vfs_fstype; /* file system type index */ 227 fsid_t vfs_fsid; /* file system id */ 228 void *vfs_data; /* private data */ 229 dev_t vfs_dev; /* device of mounted VFS */ 230 ulong_t vfs_bcount; /* I/O count (accounting) */ 231 struct vfs *vfs_list; /* sync list pointer */ 232 struct vfs *vfs_hash; /* hash list pointer */ 233 ksema_t vfs_reflock; /* mount/unmount/sync lock */ 234 uint_t vfs_count; /* vfs reference count */ 235 mntopts_t vfs_mntopts; /* options mounted with */ 236 refstr_t *vfs_resource; /* mounted resource name */ 237 refstr_t *vfs_mntpt; /* mount point name */ 238 time_t vfs_mtime; /* time we were mounted */ 239 vfs_impl_t *vfs_implp; /* impl specific data */ 240 /* 241 * Zones support. Note that the zone that "owns" the mount isn't 242 * necessarily the same as the zone in which the zone is visible. 243 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to 244 * different zones. 245 */ 246 struct zone *vfs_zone; /* zone that owns the mount */ 247 struct vfs *vfs_zone_next; /* next VFS visible in zone */ 248 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */ 249 } vfs_t; 250 251 #define vfs_femhead vfs_implp->vi_femhead 252 #define vfs_vskap vfs_implp->vi_vskap 253 #define vfs_fstypevsp vfs_implp->vi_fstypevsp 254 #define vfs_vopstats vfs_implp->vi_vopstats 255 256 /* 257 * VFS flags. 258 */ 259 #define VFS_RDONLY 0x01 /* read-only vfs */ 260 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */ 261 #define VFS_NOSETUID 0x08 /* setuid disallowed */ 262 #define VFS_REMOUNT 0x10 /* modify mount options only */ 263 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */ 264 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */ 265 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */ 266 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */ 267 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */ 268 #define VFS_XATTR 0x400 /* fs supports extended attributes */ 269 #define VFS_NODEVICES 0x800 /* device-special files disallowed */ 270 #define VFS_NOEXEC 0x1000 /* executables disallowed */ 271 #define VFS_STATS 0x2000 /* file system can collect stats */ 272 273 #define VFS_NORESOURCE "unspecified_resource" 274 #define VFS_NOMNTPT "unspecified_mountpoint" 275 276 /* 277 * Argument structure for mount(2). 278 * 279 * Flags are defined in <sys/mount.h>. 280 * 281 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in 282 * this structure are to be interpreted as kernel addresses. File systems 283 * should be prepared for this possibility. 284 */ 285 struct mounta { 286 char *spec; 287 char *dir; 288 int flags; 289 char *fstype; 290 char *dataptr; 291 int datalen; 292 char *optptr; 293 int optlen; 294 }; 295 296 /* 297 * Reasons for calling the vfs_mountroot() operation. 298 */ 299 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT}; 300 typedef enum whymountroot whymountroot_t; 301 302 /* 303 * Reasons for calling the VFS_VNSTATE(): 304 */ 305 enum vntrans { 306 VNTRANS_EXISTS, 307 VNTRANS_IDLED, 308 VNTRANS_RECLAIMED, 309 VNTRANS_DESTROYED 310 }; 311 typedef enum vntrans vntrans_t; 312 313 314 /* 315 * Operations supported on virtual file system. 316 */ 317 struct vfsops { 318 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); 319 int (*vfs_unmount)(vfs_t *, int, cred_t *); 320 int (*vfs_root)(vfs_t *, vnode_t **); 321 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); 322 int (*vfs_sync)(vfs_t *, short, cred_t *); 323 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); 324 int (*vfs_mountroot)(vfs_t *, enum whymountroot); 325 int (*vfs_freevfs)(vfs_t *); 326 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t); 327 }; 328 329 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *); 330 extern int fsop_unmount(vfs_t *, int, cred_t *); 331 extern int fsop_root(vfs_t *, vnode_t **); 332 extern int fsop_statfs(vfs_t *, statvfs64_t *); 333 extern int fsop_sync(vfs_t *, short, cred_t *); 334 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *); 335 extern int fsop_mountroot(vfs_t *, enum whymountroot); 336 extern void fsop_freefs(vfs_t *); 337 extern int fsop_sync_by_kind(int, short, cred_t *); 338 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t); 339 340 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr) 341 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr) 342 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp) 343 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp) 344 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr) 345 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp) 346 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init) 347 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp) 348 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns) 349 350 #define VFSNAME_MOUNT "mount" 351 #define VFSNAME_UNMOUNT "unmount" 352 #define VFSNAME_ROOT "root" 353 #define VFSNAME_STATVFS "statvfs" 354 #define VFSNAME_SYNC "sync" 355 #define VFSNAME_VGET "vget" 356 #define VFSNAME_MOUNTROOT "mountroot" 357 #define VFSNAME_FREEVFS "freevfs" 358 #define VFSNAME_VNSTATE "vnstate" 359 /* 360 * Filesystem type switch table. 361 */ 362 363 typedef struct vfssw { 364 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */ 365 int (*vsw_init) (int, char *); 366 /* init routine (for non-loadable fs only) */ 367 int vsw_flag; /* flags */ 368 mntopts_t vsw_optproto; /* mount options table prototype */ 369 uint_t vsw_count; /* count of references */ 370 kmutex_t vsw_lock; /* lock to protect vsw_count */ 371 vfsops_t vsw_vfsops; /* filesystem operations vector */ 372 } vfssw_t; 373 374 /* 375 * Filesystem type definition record. All file systems must export a record 376 * of this type through their modlfs structure. 377 */ 378 379 typedef struct vfsdef_v3 { 380 int def_version; /* structure version, must be first */ 381 char *name; /* filesystem type name */ 382 int (*init) (int, char *); /* init routine */ 383 int flags; /* filesystem flags */ 384 mntopts_t *optproto; /* mount options table prototype */ 385 } vfsdef_v3; 386 387 typedef struct vfsdef_v3 vfsdef_t; 388 389 enum { 390 VFSDEF_VERSION = 3 391 }; 392 393 /* 394 * Generic operations vector types (used for vfs/vnode ops registration). 395 */ 396 397 extern int fs_default(); /* "default" function placeholder */ 398 extern int fs_error(); /* "error" function placeholder */ 399 400 int fs_build_vector(void *vector, int *unused_ops, 401 const fs_operation_trans_def_t *translation, 402 const fs_operation_def_t *operations); 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 */ 413 414 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */ 415 416 #if defined(_KERNEL) 417 /* 418 * Public operations. 419 */ 420 struct umounta; 421 struct statvfsa; 422 struct fstatvfsa; 423 424 int vfs_setfsops(int, const fs_operation_def_t *, vfsops_t **); 425 int vfs_makefsops(const fs_operation_def_t *, vfsops_t **); 426 void vfs_freevfsops(vfsops_t *); 427 int vfs_freevfsops_by_type(int); 428 void vfs_setops(vfs_t *, vfsops_t *); 429 vfsops_t *vfs_getops(vfs_t *vfsp); 430 int vfs_matchops(vfs_t *, vfsops_t *); 431 int vfs_can_sync(vfs_t *vfsp); 432 void vfs_init(vfs_t *vfsp, vfsops_t *, void *); 433 void vfsimpl_setup(vfs_t *vfsp); 434 void vfsimpl_teardown(vfs_t *vfsp); 435 void vn_exists(vnode_t *); 436 void vn_idle(vnode_t *); 437 void vn_reclaim(vnode_t *); 438 void vn_invalid(vnode_t *); 439 440 int rootconf(void); 441 int svm_rootconf(void); 442 int domount(char *, struct mounta *, vnode_t *, struct cred *, 443 struct vfs **); 444 int dounmount(struct vfs *, int, cred_t *); 445 int vfs_lock(struct vfs *); 446 int vfs_rlock(struct vfs *); 447 void vfs_lock_wait(struct vfs *); 448 void vfs_rlock_wait(struct vfs *); 449 void vfs_unlock(struct vfs *); 450 int vfs_lock_held(struct vfs *); 451 struct _kthread *vfs_lock_owner(struct vfs *); 452 void sync(void); 453 void vfs_sync(int); 454 void vfs_mountroot(void); 455 void vfs_add(vnode_t *, struct vfs *, int); 456 void vfs_remove(struct vfs *); 457 458 /* The following functions are not for general use by filesystems */ 459 460 void vfs_createopttbl(mntopts_t *, const char *); 461 void vfs_copyopttbl(const mntopts_t *, mntopts_t *); 462 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *); 463 void vfs_freeopttbl(mntopts_t *); 464 void vfs_parsemntopts(mntopts_t *, char *, int); 465 int vfs_buildoptionstr(const mntopts_t *, char *, int); 466 struct mntopt *vfs_hasopt(const mntopts_t *, const char *); 467 void vfs_mnttab_modtimeupd(void); 468 469 void vfs_clearmntopt(struct vfs *, const char *); 470 void vfs_setmntopt(struct vfs *, const char *, const char *, int); 471 void vfs_setresource(struct vfs *, const char *); 472 void vfs_setmntpoint(struct vfs *, const char *); 473 refstr_t *vfs_getresource(const struct vfs *); 474 refstr_t *vfs_getmntpoint(const struct vfs *); 475 int vfs_optionisset(const struct vfs *, const char *, char **); 476 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *); 477 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *); 478 void vfs_syncall(void); 479 void vfs_syncprogress(void); 480 void vfsinit(void); 481 void vfs_unmountall(void); 482 void vfs_make_fsid(fsid_t *, dev_t, int); 483 void vfs_addmip(dev_t, struct vfs *); 484 void vfs_delmip(struct vfs *); 485 int vfs_devismounted(dev_t); 486 int vfs_devmounting(dev_t, struct vfs *); 487 int vfs_opsinuse(vfsops_t *); 488 struct vfs *getvfs(fsid_t *); 489 struct vfs *vfs_dev2vfsp(dev_t); 490 struct vfs *vfs_mntpoint2vfsp(const char *); 491 struct vfssw *allocate_vfssw(char *); 492 struct vfssw *vfs_getvfssw(char *); 493 struct vfssw *vfs_getvfsswbyname(char *); 494 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *); 495 void vfs_refvfssw(struct vfssw *); 496 void vfs_unrefvfssw(struct vfssw *); 497 uint_t vf_to_stf(uint_t); 498 void vfs_mnttab_modtime(timespec_t *); 499 void vfs_mnttab_poll(timespec_t *, struct pollhead **); 500 501 void vfs_list_lock(void); 502 void vfs_list_read_lock(void); 503 void vfs_list_unlock(void); 504 void vfs_list_add(struct vfs *); 505 void vfs_list_remove(struct vfs *); 506 void vfs_hold(vfs_t *vfsp); 507 void vfs_rele(vfs_t *vfsp); 508 void fs_freevfs(vfs_t *); 509 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype); 510 511 int vfs_zone_change_safe(vfs_t *); 512 513 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1)) 514 #define VFS_ON_LIST(vfsp) \ 515 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL) 516 517 /* 518 * Globals. 519 */ 520 521 extern struct vfssw vfssw[]; /* table of filesystem types */ 522 extern krwlock_t vfssw_lock; 523 extern char rootfstype[]; /* name of root fstype */ 524 extern const int nfstype; /* # of elements in vfssw array */ 525 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */ 526 527 /* 528 * The following variables are private to the the kernel's vfs layer. File 529 * system implementations should not access them. 530 */ 531 extern struct vfs *rootvfs; /* ptr to root vfs structure */ 532 typedef struct { 533 struct vfs *rvfs_head; /* head vfs in chain */ 534 kmutex_t rvfs_lock; /* mutex protecting this chain */ 535 uint32_t rvfs_len; /* length of this chain */ 536 } rvfs_t; 537 extern rvfs_t *rvfs_list; 538 extern int vfshsz; /* # of elements in rvfs_head array */ 539 extern const mntopts_t vfs_mntopts; /* globally recognized options */ 540 541 #endif /* defined(_KERNEL) */ 542 543 #define VFS_HOLD(vfsp) { \ 544 vfs_hold(vfsp); \ 545 } 546 547 #define VFS_RELE(vfsp) { \ 548 vfs_rele(vfsp); \ 549 } 550 551 #define VFS_INIT(vfsp, op, data) { \ 552 vfs_init((vfsp), (op), (data)); \ 553 vfsimpl_setup((vfsp)); \ 554 } 555 556 557 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0) 558 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0') 559 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER)) 560 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 561 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER)) 562 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 563 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock)) 564 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock)) 565 /* 566 * VFS_SYNC flags. 567 */ 568 #define SYNC_ATTR 0x01 /* sync attributes only */ 569 #define SYNC_CLOSE 0x02 /* close open file */ 570 #define SYNC_ALL 0x04 /* force to sync all fs */ 571 572 #ifdef __cplusplus 573 } 574 #endif 575 576 #endif /* _SYS_VFS_H */ 577