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 47extern "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 59typedef struct vfsops vfsops_t; 60 61/* 62 * File system identifier. Should be unique (at least per machine). 63 */ 64typedef 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 89typedef 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 */ 104typedef 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 115typedef 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 */ 125typedef 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 */ 153typedef 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 */ 167typedef 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 173extern avl_tree_t vskstat_tree; 174extern 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 */ 199struct zone; /* from zone.h */ 200struct fem_head; /* from fem.h */ 201 202typedef 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 */ 274typedef 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 */ 296struct 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 */ 310enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT}; 311typedef enum whymountroot whymountroot_t; 312 313/* 314 * Reasons for calling the VFS_VNSTATE(): 315 */ 316enum vntrans { 317 VNTRANS_EXISTS, 318 VNTRANS_IDLED, 319 VNTRANS_RECLAIMED, 320 VNTRANS_DESTROYED 321}; 322typedef 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 */ 342struct vfsops { 343 VFS_OPS; /* Signature of all vfs operations (vfsops) */ 344}; 345 346extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *); 347extern int fsop_unmount(vfs_t *, int, cred_t *); 348extern int fsop_root(vfs_t *, vnode_t **); 349extern int fsop_statfs(vfs_t *, statvfs64_t *); 350extern int fsop_sync(vfs_t *, short, cred_t *); 351extern int fsop_vget(vfs_t *, vnode_t **, fid_t *); 352extern int fsop_mountroot(vfs_t *, enum whymountroot); 353extern void fsop_freefs(vfs_t *); 354extern int fsop_sync_by_kind(int, short, cred_t *); 355extern 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 380typedef 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 397typedef 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 405typedef struct vfsdef_v5 vfsdef_t; 406 407enum { 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 439typedef 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 */ 457struct umounta; 458struct statvfsa; 459struct fstatvfsa; 460 461void vfs_freevfsops(vfsops_t *); 462int vfs_freevfsops_by_type(int); 463void vfs_setops(vfs_t *, vfsops_t *); 464vfsops_t *vfs_getops(vfs_t *vfsp); 465int vfs_matchops(vfs_t *, vfsops_t *); 466int vfs_can_sync(vfs_t *vfsp); 467vfs_t *vfs_alloc(int); 468void vfs_free(vfs_t *); 469void vfs_init(vfs_t *vfsp, vfsops_t *, void *); 470void vfsimpl_setup(vfs_t *vfsp); 471void vfsimpl_teardown(vfs_t *vfsp); 472void vn_exists(vnode_t *); 473void vn_idle(vnode_t *); 474void vn_reclaim(vnode_t *); 475void vn_invalid(vnode_t *); 476 477int rootconf(void); 478int svm_rootconf(void); 479int domount(char *, struct mounta *, vnode_t *, struct cred *, 480 struct vfs **); 481int dounmount(struct vfs *, int, cred_t *); 482int vfs_lock(struct vfs *); 483int vfs_rlock(struct vfs *); 484void vfs_lock_wait(struct vfs *); 485void vfs_rlock_wait(struct vfs *); 486void vfs_unlock(struct vfs *); 487int vfs_lock_held(struct vfs *); 488struct _kthread *vfs_lock_owner(struct vfs *); 489void sync(void); 490void vfs_sync(int); 491void vfs_mountroot(void); 492void vfs_add(vnode_t *, struct vfs *, int); 493void vfs_remove(struct vfs *); 494 495/* VFS feature routines */ 496void vfs_set_feature(vfs_t *, vfs_feature_t); 497void vfs_clear_feature(vfs_t *, vfs_feature_t); 498int vfs_has_feature(vfs_t *, vfs_feature_t); 499void vfs_propagate_features(vfs_t *, vfs_t *); 500 501/* The following functions are not for general use by filesystems */ 502 503void vfs_createopttbl(mntopts_t *, const char *); 504void vfs_copyopttbl(const mntopts_t *, mntopts_t *); 505void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *); 506void vfs_freeopttbl(mntopts_t *); 507void vfs_parsemntopts(mntopts_t *, char *, int); 508int vfs_buildoptionstr(const mntopts_t *, char *, int); 509struct mntopt *vfs_hasopt(const mntopts_t *, const char *); 510void vfs_mnttab_modtimeupd(void); 511 512void vfs_clearmntopt(struct vfs *, const char *); 513void vfs_setmntopt(struct vfs *, const char *, const char *, int); 514void vfs_setresource(struct vfs *, const char *, uint32_t); 515void vfs_setmntpoint(struct vfs *, const char *, uint32_t); 516refstr_t *vfs_getresource(const struct vfs *); 517refstr_t *vfs_getmntpoint(const struct vfs *); 518int vfs_optionisset(const struct vfs *, const char *, char **); 519int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *); 520int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *); 521void vfs_syncall(void); 522void vfs_syncprogress(void); 523void vfsinit(void); 524void vfs_unmountall(void); 525void vfs_make_fsid(fsid_t *, dev_t, int); 526void vfs_addmip(dev_t, struct vfs *); 527void vfs_delmip(struct vfs *); 528int vfs_devismounted(dev_t); 529int vfs_devmounting(dev_t, struct vfs *); 530int vfs_opsinuse(vfsops_t *); 531struct vfs *getvfs(fsid_t *); 532struct vfs *vfs_dev2vfsp(dev_t); 533struct vfs *vfs_mntpoint2vfsp(const char *); 534struct vfssw *allocate_vfssw(const char *); 535struct vfssw *vfs_getvfssw(const char *); 536struct vfssw *vfs_getvfsswbyname(const char *); 537struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *); 538void vfs_refvfssw(struct vfssw *); 539void vfs_unrefvfssw(struct vfssw *); 540uint_t vf_to_stf(uint_t); 541void vfs_mnttab_modtime(timespec_t *); 542void vfs_mnttab_poll(timespec_t *, struct pollhead **); 543 544void vfs_list_lock(void); 545void vfs_list_read_lock(void); 546void vfs_list_unlock(void); 547void vfs_list_add(struct vfs *); 548void vfs_list_remove(struct vfs *); 549void vfs_hold(vfs_t *vfsp); 550void vfs_rele(vfs_t *vfsp); 551void fs_freevfs(vfs_t *); 552void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype); 553 554int vfs_zone_change_safe(vfs_t *); 555 556int 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 566extern struct vfssw vfssw[]; /* table of filesystem types */ 567extern krwlock_t vfssw_lock; 568extern char rootfstype[]; /* name of root fstype */ 569extern const int nfstype; /* # of elements in vfssw array */ 570extern 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 */ 576extern struct vfs *rootvfs; /* ptr to root vfs structure */ 577typedef 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; 582extern rvfs_t *rvfs_list; 583extern int vfshsz; /* # of elements in rvfs_head array */ 584extern 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 */ 621