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 /* 23 * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright 2016 Toomas Soome <tsoome@me.com> 25 * Copyright (c) 2016 by Delphix. All rights reserved. 26 * Copyright 2016 Nexenta Systems, Inc. 27 */ 28 29 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 30 /* All Rights Reserved */ 31 32 /* 33 * Portions of this source code were derived from Berkeley 4.3 BSD 34 * under license from the Regents of the University of California. 35 */ 36 37 #ifndef _SYS_VFS_H 38 #define _SYS_VFS_H 39 40 #include <sys/zone.h> 41 #include <sys/types.h> 42 #include <sys/t_lock.h> 43 #include <sys/cred.h> 44 #include <sys/vnode.h> 45 #include <sys/statvfs.h> 46 #include <sys/refstr.h> 47 #include <sys/avl.h> 48 #include <sys/time.h> 49 50 #ifdef __cplusplus 51 extern "C" { 52 #endif 53 54 /* 55 * Data associated with mounted file systems. 56 */ 57 58 /* 59 * Operations vector. This is used internal to the kernel; file systems 60 * supply their list of operations via vfs_setfsops(). 61 */ 62 63 typedef struct vfsops vfsops_t; 64 65 /* 66 * File system identifier. Should be unique (at least per machine). 67 */ 68 typedef struct { 69 int val[2]; /* file system id type */ 70 } fsid_t; 71 72 /* 73 * File identifier. Should be unique per filesystem on a single 74 * machine. This is typically called by a stateless file server 75 * in order to generate "file handles". 76 * 77 * Many underlying file systems cast a struct fid into other 78 * file system dependent structures which may require 4 byte alignment. 79 * Because a fid starts with a short it may not be 4 byte aligned, the 80 * fid_pad will force the alignment. 81 */ 82 #define MAXFIDSZ 64 83 #define OLD_MAXFIDSZ 16 84 85 typedef struct fid { 86 union { 87 long fid_pad; 88 struct { 89 ushort_t len; /* length of data in bytes */ 90 char data[MAXFIDSZ]; /* data (variable len) */ 91 } _fid; 92 } un; 93 } fid_t; 94 95 #ifdef _SYSCALL32 96 /* 97 * Solaris 64 - use old-style cache format with 32-bit aligned fid for on-disk 98 * struct compatibility. 99 */ 100 typedef struct fid32 { 101 union { 102 int32_t fid_pad; 103 struct { 104 uint16_t len; /* length of data in bytes */ 105 char data[MAXFIDSZ]; /* data (variable len) */ 106 } _fid; 107 } un; 108 } fid32_t; 109 #else /* not _SYSCALL32 */ 110 #define fid32 fid 111 typedef fid_t fid32_t; 112 #endif /* _SYSCALL32 */ 113 114 #define fid_len un._fid.len 115 #define fid_data un._fid.data 116 117 /* 118 * Structure defining a mount option for a filesystem. 119 * option names are found in mntent.h 120 */ 121 typedef struct mntopt { 122 char *mo_name; /* option name */ 123 char **mo_cancel; /* list of options cancelled by this one */ 124 char *mo_arg; /* argument string for this option */ 125 int mo_flags; /* flags for this mount option */ 126 void *mo_data; /* filesystem specific data */ 127 } mntopt_t; 128 129 /* 130 * Flags that apply to mount options 131 */ 132 133 #define MO_SET 0x01 /* option is set */ 134 #define MO_NODISPLAY 0x02 /* option not listed in mnttab */ 135 #define MO_HASVALUE 0x04 /* option takes a value */ 136 #define MO_IGNORE 0x08 /* option ignored by parser */ 137 #define MO_DEFAULT MO_SET /* option is on by default */ 138 #define MO_TAG 0x10 /* flags a tag set by user program */ 139 #define MO_EMPTY 0x20 /* empty space in option table */ 140 141 #define VFS_NOFORCEOPT 0x01 /* honor MO_IGNORE (don't set option) */ 142 #define VFS_DISPLAY 0x02 /* Turn off MO_NODISPLAY bit for opt */ 143 #define VFS_NODISPLAY 0x04 /* Turn on MO_NODISPLAY bit for opt */ 144 #define VFS_CREATEOPT 0x08 /* Create the opt if it's not there */ 145 146 /* 147 * Structure holding mount option strings for the mounted file system. 148 */ 149 typedef struct mntopts { 150 uint_t mo_count; /* number of entries in table */ 151 mntopt_t *mo_list; /* list of mount options */ 152 } mntopts_t; 153 154 /* 155 * The kstat structures associated with the vopstats are kept in an 156 * AVL tree. This is to avoid the case where a file system does not 157 * use a unique fsid_t for each vfs (e.g., namefs). In order to do 158 * this, we need a structure that the AVL tree can use that also 159 * references the kstat. 160 * Note that the vks_fsid is generated from the value reported by 161 * VFS_STATVFS(). 162 */ 163 typedef struct vskstat_anchor { 164 avl_node_t vsk_node; /* Required for use by AVL routines */ 165 kstat_t *vsk_ksp; /* kstat structure for vopstats */ 166 ulong_t vsk_fsid; /* fsid associated w/this FS */ 167 } vsk_anchor_t; 168 169 extern avl_tree_t vskstat_tree; 170 extern kmutex_t vskstat_tree_lock; 171 172 /* 173 * Structure per mounted file system. Each mounted file system has 174 * an array of operations and an instance record. 175 * 176 * The file systems are kept on a doubly linked circular list headed by 177 * "rootvfs". 178 * File system implementations should not access this list; 179 * it's intended for use only in the kernel's vfs layer. 180 * 181 * Each zone also has its own list of mounts, containing filesystems mounted 182 * somewhere within the filesystem tree rooted at the zone's rootpath. The 183 * list is doubly linked to match the global list. 184 * 185 * mnttab locking: the in-kernel mnttab uses the vfs_mntpt, vfs_resource and 186 * vfs_mntopts fields in the vfs_t. mntpt and resource are refstr_ts that 187 * are set at mount time and can only be modified during a remount. 188 * It is safe to read these fields if you can prevent a remount on the vfs, 189 * or through the convenience funcs vfs_getmntpoint() and vfs_getresource(). 190 * The mntopts field may only be accessed through the provided convenience 191 * functions, as it is protected by the vfs list lock. Modifying a mount 192 * option requires grabbing the vfs list write lock, which can be a very 193 * high latency lock. 194 */ 195 struct zone; /* from zone.h */ 196 struct fem_head; /* from fem.h */ 197 198 typedef struct vfs { 199 struct vfs *vfs_next; /* next VFS in VFS list */ 200 struct vfs *vfs_prev; /* prev VFS in VFS list */ 201 202 /* vfs_op should not be used directly. Accessor functions are provided */ 203 vfsops_t *vfs_op; /* operations on VFS */ 204 205 struct vnode *vfs_vnodecovered; /* vnode mounted on */ 206 uint_t vfs_flag; /* flags */ 207 uint_t vfs_bsize; /* native block size */ 208 int vfs_fstype; /* file system type index */ 209 fsid_t vfs_fsid; /* file system id */ 210 void *vfs_data; /* private data */ 211 dev_t vfs_dev; /* device of mounted VFS */ 212 ulong_t vfs_bcount; /* I/O count (accounting) */ 213 struct vfs *vfs_list; /* sync list pointer */ 214 struct vfs *vfs_hash; /* hash list pointer */ 215 ksema_t vfs_reflock; /* mount/unmount/sync lock */ 216 uint_t vfs_count; /* vfs reference count */ 217 mntopts_t vfs_mntopts; /* options mounted with */ 218 refstr_t *vfs_resource; /* mounted resource name */ 219 refstr_t *vfs_mntpt; /* mount point name */ 220 time_t vfs_mtime; /* time we were mounted */ 221 struct vfs_impl *vfs_implp; /* impl specific data */ 222 /* 223 * Zones support. Note that the zone that "owns" the mount isn't 224 * necessarily the same as the zone in which the zone is visible. 225 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to 226 * different zones. 227 */ 228 struct zone *vfs_zone; /* zone that owns the mount */ 229 struct vfs *vfs_zone_next; /* next VFS visible in zone */ 230 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */ 231 232 struct fem_head *vfs_femhead; /* fs monitoring */ 233 uint32_t vfs_lofi_id; /* ID if lofi mount */ 234 } vfs_t; 235 236 #define vfs_featureset vfs_implp->vi_featureset 237 #define vfs_vskap vfs_implp->vi_vskap 238 #define vfs_fstypevsp vfs_implp->vi_fstypevsp 239 #define vfs_vopstats vfs_implp->vi_vopstats 240 #define vfs_hrctime vfs_implp->vi_hrctime 241 242 /* 243 * VFS flags. 244 */ 245 #define VFS_RDONLY 0x01 /* read-only vfs */ 246 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */ 247 #define VFS_NOSETUID 0x08 /* setuid disallowed */ 248 #define VFS_REMOUNT 0x10 /* modify mount options only */ 249 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */ 250 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */ 251 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */ 252 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */ 253 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */ 254 #define VFS_XATTR 0x400 /* fs supports extended attributes */ 255 #define VFS_NODEVICES 0x800 /* device-special files disallowed */ 256 #define VFS_NOEXEC 0x1000 /* executables disallowed */ 257 #define VFS_STATS 0x2000 /* file system can collect stats */ 258 #define VFS_XID 0x4000 /* file system supports extended ids */ 259 260 #define VFS_NORESOURCE "unspecified_resource" 261 #define VFS_NOMNTPT "unspecified_mountpoint" 262 263 /* 264 * VFS features are implemented as bits set in the vfs_t. 265 * The vfs_feature_t typedef is a 64-bit number that will translate 266 * into an element in an array of bitmaps and a bit in that element. 267 * Developers must not depend on the implementation of this and 268 * need to use vfs_has_feature()/vfs_set_feature() routines. 269 */ 270 typedef uint64_t vfs_feature_t; 271 272 #define VFSFT_XVATTR 0x100000001 /* Supports xvattr for attrs */ 273 #define VFSFT_CASEINSENSITIVE 0x100000002 /* Supports case-insensitive */ 274 #define VFSFT_NOCASESENSITIVE 0x100000004 /* NOT case-sensitive */ 275 #define VFSFT_DIRENTFLAGS 0x100000008 /* Supports dirent flags */ 276 #define VFSFT_ACLONCREATE 0x100000010 /* Supports ACL on create */ 277 #define VFSFT_ACEMASKONACCESS 0x100000020 /* Can use ACEMASK for access */ 278 #define VFSFT_SYSATTR_VIEWS 0x100000040 /* Supports sysattr view i/f */ 279 #define VFSFT_ACCESS_FILTER 0x100000080 /* dirents filtered by access */ 280 #define VFSFT_REPARSE 0x100000100 /* Supports reparse point */ 281 #define VFSFT_ZEROCOPY_SUPPORTED 0x100000200 282 /* Support loaning /returning cache buffer */ 283 /* 284 * Argument structure for mount(2). 285 * 286 * Flags are defined in <sys/mount.h>. 287 * 288 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in 289 * this structure are to be interpreted as kernel addresses. File systems 290 * should be prepared for this possibility. 291 */ 292 struct mounta { 293 char *spec; 294 char *dir; 295 int flags; 296 char *fstype; 297 char *dataptr; 298 int datalen; 299 char *optptr; 300 int optlen; 301 }; 302 303 /* 304 * Reasons for calling the vfs_mountroot() operation. 305 */ 306 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT}; 307 typedef enum whymountroot whymountroot_t; 308 309 /* 310 * Reasons for calling the VFS_VNSTATE(): 311 */ 312 enum vntrans { 313 VNTRANS_EXISTS, 314 VNTRANS_IDLED, 315 VNTRANS_RECLAIMED, 316 VNTRANS_DESTROYED 317 }; 318 typedef enum vntrans vntrans_t; 319 320 /* 321 * VFS_OPS defines all the vfs operations. It is used to define 322 * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h). 323 */ 324 #define VFS_OPS \ 325 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \ 326 int (*vfs_unmount)(vfs_t *, int, cred_t *); \ 327 int (*vfs_root)(vfs_t *, vnode_t **); \ 328 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); \ 329 int (*vfs_sync)(vfs_t *, short, cred_t *); \ 330 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); \ 331 int (*vfs_mountroot)(vfs_t *, enum whymountroot); \ 332 void (*vfs_freevfs)(vfs_t *); \ 333 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t) /* NB: No ";" */ 334 335 /* 336 * Operations supported on virtual file system. 337 */ 338 struct vfsops { 339 VFS_OPS; /* Signature of all vfs operations (vfsops) */ 340 }; 341 342 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *); 343 extern int fsop_unmount(vfs_t *, int, cred_t *); 344 extern int fsop_root(vfs_t *, vnode_t **); 345 extern int fsop_statfs(vfs_t *, statvfs64_t *); 346 extern int fsop_sync(vfs_t *, short, cred_t *); 347 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *); 348 extern int fsop_mountroot(vfs_t *, enum whymountroot); 349 extern void fsop_freefs(vfs_t *); 350 extern int fsop_sync_by_kind(int, short, cred_t *); 351 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t); 352 353 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr) 354 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr) 355 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp) 356 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp) 357 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr) 358 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp) 359 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init) 360 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp) 361 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns) 362 363 #define VFSNAME_MOUNT "mount" 364 #define VFSNAME_UNMOUNT "unmount" 365 #define VFSNAME_ROOT "root" 366 #define VFSNAME_STATVFS "statvfs" 367 #define VFSNAME_SYNC "sync" 368 #define VFSNAME_VGET "vget" 369 #define VFSNAME_MOUNTROOT "mountroot" 370 #define VFSNAME_FREEVFS "freevfs" 371 #define VFSNAME_VNSTATE "vnstate" 372 /* 373 * Filesystem type switch table. 374 */ 375 376 typedef struct vfssw { 377 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */ 378 int (*vsw_init) (int, char *); 379 /* init routine (for non-loadable fs only) */ 380 int vsw_flag; /* flags */ 381 mntopts_t vsw_optproto; /* mount options table prototype */ 382 uint_t vsw_count; /* count of references */ 383 kmutex_t vsw_lock; /* lock to protect vsw_count */ 384 vfsops_t vsw_vfsops; /* filesystem operations vector */ 385 } vfssw_t; 386 387 /* 388 * Filesystem type definition record. All file systems must export a record 389 * of this type through their modlfs structure. N.B., changing the version 390 * number requires a change in sys/modctl.h. 391 */ 392 393 typedef struct vfsdef_v5 { 394 int def_version; /* structure version, must be first */ 395 char *name; /* filesystem type name */ 396 int (*init) (int, char *); /* init routine */ 397 int flags; /* filesystem flags */ 398 mntopts_t *optproto; /* mount options table prototype */ 399 } vfsdef_v5; 400 401 typedef struct vfsdef_v5 vfsdef_t; 402 403 enum { 404 VFSDEF_VERSION = 5 405 }; 406 407 /* 408 * flags for vfssw and vfsdef 409 */ 410 #define VSW_HASPROTO 0x01 /* struct has a mount options prototype */ 411 #define VSW_CANRWRO 0x02 /* file system can transition from rw to ro */ 412 #define VSW_CANREMOUNT 0x04 /* file system supports remounts */ 413 #define VSW_NOTZONESAFE 0x08 /* zone_enter(2) should fail for these files */ 414 #define VSW_VOLATILEDEV 0x10 /* vfs_dev can change each time fs is mounted */ 415 #define VSW_STATS 0x20 /* file system can collect stats */ 416 #define VSW_XID 0x40 /* file system supports extended ids */ 417 #define VSW_CANLOFI 0x80 /* file system supports lofi mounts */ 418 #define VSW_ZMOUNT 0x100 /* file system always allowed in a zone */ 419 420 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */ 421 422 /* 423 * A flag for vfs_setpath(). 424 */ 425 #define VFSSP_VERBATIM 0x1 /* do not prefix the supplied path */ 426 427 #if defined(_KERNEL) || defined(_FAKE_KERNEL) 428 429 /* 430 * Private vfs data, NOT to be used by a file system implementation. 431 */ 432 433 #define VFS_FEATURE_MAXSZ 4 434 435 typedef struct vfs_impl { 436 /* Counted array - Bitmap of vfs features */ 437 uint32_t vi_featureset[VFS_FEATURE_MAXSZ]; 438 /* 439 * Support for statistics on the vnode operations 440 */ 441 vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */ 442 vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */ 443 vopstats_t vi_vopstats; /* per-mount vnode op stats */ 444 445 timespec_t vi_hrctime; /* High-res creation time */ 446 447 zone_ref_t vi_zone_ref; /* reference to zone */ 448 } vfs_impl_t; 449 450 /* 451 * Public operations. 452 */ 453 struct umounta; 454 struct statvfsa; 455 struct fstatvfsa; 456 457 void vfs_freevfsops(vfsops_t *); 458 int vfs_freevfsops_by_type(int); 459 void vfs_setops(vfs_t *, vfsops_t *); 460 vfsops_t *vfs_getops(vfs_t *vfsp); 461 int vfs_matchops(vfs_t *, vfsops_t *); 462 int vfs_can_sync(vfs_t *vfsp); 463 vfs_t *vfs_alloc(int); 464 void vfs_free(vfs_t *); 465 void vfs_init(vfs_t *vfsp, vfsops_t *, void *); 466 void vfsimpl_setup(vfs_t *vfsp); 467 void vfsimpl_teardown(vfs_t *vfsp); 468 void vn_exists(vnode_t *); 469 void vn_idle(vnode_t *); 470 void vn_reclaim(vnode_t *); 471 void vn_invalid(vnode_t *); 472 473 int rootconf(void); 474 int domount(char *, struct mounta *, vnode_t *, struct cred *, 475 struct vfs **); 476 int dounmount(struct vfs *, int, cred_t *); 477 int vfs_lock(struct vfs *); 478 int vfs_rlock(struct vfs *); 479 void vfs_lock_wait(struct vfs *); 480 void vfs_rlock_wait(struct vfs *); 481 void vfs_unlock(struct vfs *); 482 int vfs_lock_held(struct vfs *); 483 struct _kthread *vfs_lock_owner(struct vfs *); 484 void sync(void); 485 void vfs_sync(int); 486 void vfs_mountroot(void); 487 void vfs_add(vnode_t *, struct vfs *, int); 488 void vfs_remove(struct vfs *); 489 490 /* VFS feature routines */ 491 void vfs_set_feature(vfs_t *, vfs_feature_t); 492 void vfs_clear_feature(vfs_t *, vfs_feature_t); 493 int vfs_has_feature(vfs_t *, vfs_feature_t); 494 void vfs_propagate_features(vfs_t *, vfs_t *); 495 496 /* The following functions are not for general use by filesystems */ 497 498 void vfs_createopttbl(mntopts_t *, const char *); 499 void vfs_copyopttbl(const mntopts_t *, mntopts_t *); 500 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *); 501 void vfs_freeopttbl(mntopts_t *); 502 void vfs_parsemntopts(mntopts_t *, char *, int); 503 int vfs_buildoptionstr(const mntopts_t *, char *, int); 504 struct mntopt *vfs_hasopt(const mntopts_t *, const char *); 505 void vfs_mnttab_modtimeupd(void); 506 507 void vfs_clearmntopt(struct vfs *, const char *); 508 void vfs_setmntopt(struct vfs *, const char *, const char *, int); 509 void vfs_setresource(struct vfs *, const char *, uint32_t); 510 void vfs_setmntpoint(struct vfs *, const char *, uint32_t); 511 refstr_t *vfs_getresource(const struct vfs *); 512 refstr_t *vfs_getmntpoint(const struct vfs *); 513 int vfs_optionisset(const struct vfs *, const char *, char **); 514 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *); 515 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *); 516 void vfs_syncall(void); 517 void vfsinit(void); 518 void vfs_unmountall(void); 519 void vfs_make_fsid(fsid_t *, dev_t, int); 520 void vfs_addmip(dev_t, struct vfs *); 521 void vfs_delmip(struct vfs *); 522 int vfs_devismounted(dev_t); 523 int vfs_devmounting(dev_t, struct vfs *); 524 int vfs_opsinuse(vfsops_t *); 525 struct vfs *getvfs(fsid_t *); 526 struct vfs *vfs_dev2vfsp(dev_t); 527 struct vfs *vfs_mntpoint2vfsp(const char *); 528 struct vfssw *allocate_vfssw(const char *); 529 struct vfssw *vfs_getvfssw(const char *); 530 struct vfssw *vfs_getvfsswbyname(const char *); 531 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *); 532 void vfs_refvfssw(struct vfssw *); 533 void vfs_unrefvfssw(struct vfssw *); 534 uint_t vf_to_stf(uint_t); 535 void vfs_mnttab_modtime(timespec_t *); 536 void vfs_mnttab_poll(timespec_t *, struct pollhead **); 537 538 void vfs_list_lock(void); 539 void vfs_list_read_lock(void); 540 void vfs_list_unlock(void); 541 void vfs_list_add(struct vfs *); 542 void vfs_list_remove(struct vfs *); 543 void vfs_hold(vfs_t *vfsp); 544 void vfs_rele(vfs_t *vfsp); 545 void fs_freevfs(vfs_t *); 546 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype); 547 548 int vfs_zone_change_safe(vfs_t *); 549 550 int vfs_get_lofi(vfs_t *, vnode_t **); 551 552 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1)) 553 #define VFS_ON_LIST(vfsp) \ 554 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL) 555 556 /* 557 * Globals. 558 */ 559 560 extern struct vfssw vfssw[]; /* table of filesystem types */ 561 extern krwlock_t vfssw_lock; 562 extern char rootfstype[]; /* name of root fstype */ 563 extern const int nfstype; /* # of elements in vfssw array */ 564 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */ 565 566 /* 567 * The following variables are private to the the kernel's vfs layer. File 568 * system implementations should not access them. 569 */ 570 extern struct vfs *rootvfs; /* ptr to root vfs structure */ 571 typedef struct { 572 struct vfs *rvfs_head; /* head vfs in chain */ 573 kmutex_t rvfs_lock; /* mutex protecting this chain */ 574 uint32_t rvfs_len; /* length of this chain */ 575 } rvfs_t; 576 extern rvfs_t *rvfs_list; 577 extern int vfshsz; /* # of elements in rvfs_head array */ 578 extern const mntopts_t vfs_mntopts; /* globally recognized options */ 579 580 #endif /* defined(_KERNEL) */ 581 582 #define VFS_HOLD(vfsp) { \ 583 vfs_hold(vfsp); \ 584 } 585 586 #define VFS_RELE(vfsp) { \ 587 vfs_rele(vfsp); \ 588 } 589 590 #define VFS_INIT(vfsp, op, data) { \ 591 vfs_init((vfsp), (op), (data)); \ 592 } 593 594 595 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0) 596 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0') 597 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER)) 598 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 599 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER)) 600 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 601 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock)) 602 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock)) 603 /* 604 * VFS_SYNC flags. 605 */ 606 #define SYNC_ATTR 0x01 /* sync attributes only */ 607 #define SYNC_CLOSE 0x02 /* close open file */ 608 #define SYNC_ALL 0x04 /* force to sync all fs */ 609 610 #ifdef __cplusplus 611 } 612 #endif 613 614 #endif /* _SYS_VFS_H */ 615