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, 2017 by Delphix. All rights reserved. 26 * Copyright 2017 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 vsk_anchor_t; 164 165 extern avl_tree_t vskstat_tree; 166 extern kmutex_t vskstat_tree_lock; 167 168 #if defined(_KERNEL) || defined(_FAKE_KERNEL) 169 /* 170 * Structure per mounted file system. Each mounted file system has 171 * an array of operations and an instance record. 172 * 173 * The file systems are kept on a doubly linked circular list headed by 174 * "rootvfs". 175 * File system implementations should not access this list; 176 * it's intended for use only in the kernel's vfs layer. 177 * 178 * Each zone also has its own list of mounts, containing filesystems mounted 179 * somewhere within the filesystem tree rooted at the zone's rootpath. The 180 * list is doubly linked to match the global list. 181 * 182 * mnttab locking: the in-kernel mnttab uses the vfs_mntpt, vfs_resource and 183 * vfs_mntopts fields in the vfs_t. mntpt and resource are refstr_ts that 184 * are set at mount time and can only be modified during a remount. 185 * It is safe to read these fields if you can prevent a remount on the vfs, 186 * or through the convenience funcs vfs_getmntpoint() and vfs_getresource(). 187 * The mntopts field may only be accessed through the provided convenience 188 * functions, as it is protected by the vfs list lock. Modifying a mount 189 * option requires grabbing the vfs list write lock, which can be a very 190 * high latency lock. 191 */ 192 struct zone; /* from zone.h */ 193 struct fem_head; /* from fem.h */ 194 195 typedef struct vfs { 196 struct vfs *vfs_next; /* next VFS in VFS list */ 197 struct vfs *vfs_prev; /* prev VFS in VFS list */ 198 199 /* vfs_op should not be used directly. Accessor functions are provided */ 200 vfsops_t *vfs_op; /* operations on VFS */ 201 202 struct vnode *vfs_vnodecovered; /* vnode mounted on */ 203 uint_t vfs_flag; /* flags */ 204 uint_t vfs_bsize; /* native block size */ 205 int vfs_fstype; /* file system type index */ 206 fsid_t vfs_fsid; /* file system id */ 207 void *vfs_data; /* private data */ 208 dev_t vfs_dev; /* device of mounted VFS */ 209 ulong_t vfs_bcount; /* I/O count (accounting) */ 210 struct vfs *vfs_list; /* sync list pointer */ 211 struct vfs *vfs_hash; /* hash list pointer */ 212 ksema_t vfs_reflock; /* mount/unmount/sync lock */ 213 uint_t vfs_count; /* vfs reference count */ 214 mntopts_t vfs_mntopts; /* options mounted with */ 215 refstr_t *vfs_resource; /* mounted resource name */ 216 refstr_t *vfs_mntpt; /* mount point name */ 217 time_t vfs_mtime; /* time we were mounted */ 218 struct vfs_impl *vfs_implp; /* impl specific data */ 219 /* 220 * Zones support. Note that the zone that "owns" the mount isn't 221 * necessarily the same as the zone in which the zone is visible. 222 * That is, vfs_zone and (vfs_zone_next|vfs_zone_prev) may refer to 223 * different zones. 224 */ 225 struct zone *vfs_zone; /* zone that owns the mount */ 226 struct vfs *vfs_zone_next; /* next VFS visible in zone */ 227 struct vfs *vfs_zone_prev; /* prev VFS visible in zone */ 228 229 struct fem_head *vfs_femhead; /* fs monitoring */ 230 uint32_t vfs_lofi_id; /* ID if lofi mount */ 231 } vfs_t; 232 233 #define vfs_featureset vfs_implp->vi_featureset 234 #define vfs_vskap vfs_implp->vi_vskap 235 #define vfs_fstypevsp vfs_implp->vi_fstypevsp 236 #define vfs_vopstats vfs_implp->vi_vopstats 237 #define vfs_hrctime vfs_implp->vi_hrctime 238 239 #else // defined(_KERNEL) || defined(_FAKE_KERNEL) 240 241 typedef struct vfs vfs_t; 242 243 #endif // defined(_KERNEL) || defined(_FAKE_KERNEL) 244 245 /* 246 * VFS flags. 247 */ 248 #define VFS_RDONLY 0x01 /* read-only vfs */ 249 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */ 250 #define VFS_NOSETUID 0x08 /* setuid disallowed */ 251 #define VFS_REMOUNT 0x10 /* modify mount options only */ 252 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */ 253 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */ 254 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */ 255 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */ 256 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */ 257 #define VFS_XATTR 0x400 /* fs supports extended attributes */ 258 #define VFS_NODEVICES 0x800 /* device-special files disallowed */ 259 #define VFS_NOEXEC 0x1000 /* executables disallowed */ 260 #define VFS_STATS 0x2000 /* file system can collect stats */ 261 #define VFS_XID 0x4000 /* file system supports extended ids */ 262 263 #define VFS_NORESOURCE "unspecified_resource" 264 #define VFS_NOMNTPT "unspecified_mountpoint" 265 266 /* 267 * VFS features are implemented as bits set in the vfs_t. 268 * The vfs_feature_t typedef is a 64-bit number that will translate 269 * into an element in an array of bitmaps and a bit in that element. 270 * Developers must not depend on the implementation of this and 271 * need to use vfs_has_feature()/vfs_set_feature() routines. 272 */ 273 typedef uint64_t vfs_feature_t; 274 275 #define VFSFT_XVATTR 0x100000001 /* Supports xvattr for attrs */ 276 #define VFSFT_CASEINSENSITIVE 0x100000002 /* Supports case-insensitive */ 277 #define VFSFT_NOCASESENSITIVE 0x100000004 /* NOT case-sensitive */ 278 #define VFSFT_DIRENTFLAGS 0x100000008 /* Supports dirent flags */ 279 #define VFSFT_ACLONCREATE 0x100000010 /* Supports ACL on create */ 280 #define VFSFT_ACEMASKONACCESS 0x100000020 /* Can use ACEMASK for access */ 281 #define VFSFT_SYSATTR_VIEWS 0x100000040 /* Supports sysattr view i/f */ 282 #define VFSFT_ACCESS_FILTER 0x100000080 /* dirents filtered by access */ 283 #define VFSFT_REPARSE 0x100000100 /* Supports reparse point */ 284 #define VFSFT_ZEROCOPY_SUPPORTED 0x100000200 285 /* Support loaning /returning cache buffer */ 286 /* 287 * Argument structure for mount(2). 288 * 289 * Flags are defined in <sys/mount.h>. 290 * 291 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in 292 * this structure are to be interpreted as kernel addresses. File systems 293 * should be prepared for this possibility. 294 */ 295 struct mounta { 296 char *spec; 297 char *dir; 298 int flags; 299 char *fstype; 300 char *dataptr; 301 int datalen; 302 char *optptr; 303 int optlen; 304 }; 305 306 /* 307 * Reasons for calling the vfs_mountroot() operation. 308 */ 309 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT}; 310 typedef enum whymountroot whymountroot_t; 311 312 /* 313 * Reasons for calling the VFS_VNSTATE(): 314 */ 315 enum vntrans { 316 VNTRANS_EXISTS, 317 VNTRANS_IDLED, 318 VNTRANS_RECLAIMED, 319 VNTRANS_DESTROYED 320 }; 321 typedef enum vntrans vntrans_t; 322 323 /* 324 * VFS_OPS defines all the vfs operations. It is used to define 325 * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h). 326 */ 327 #define VFS_OPS \ 328 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \ 329 int (*vfs_unmount)(vfs_t *, int, cred_t *); \ 330 int (*vfs_root)(vfs_t *, vnode_t **); \ 331 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); \ 332 int (*vfs_sync)(vfs_t *, short, cred_t *); \ 333 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); \ 334 int (*vfs_mountroot)(vfs_t *, enum whymountroot); \ 335 void (*vfs_freevfs)(vfs_t *); \ 336 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t) /* NB: No ";" */ 337 338 /* 339 * Operations supported on virtual file system. 340 */ 341 struct vfsops { 342 VFS_OPS; /* Signature of all vfs operations (vfsops) */ 343 }; 344 345 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *); 346 extern int fsop_unmount(vfs_t *, int, cred_t *); 347 extern int fsop_root(vfs_t *, vnode_t **); 348 extern int fsop_statfs(vfs_t *, statvfs64_t *); 349 extern int fsop_sync(vfs_t *, short, cred_t *); 350 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *); 351 extern int fsop_mountroot(vfs_t *, enum whymountroot); 352 extern void fsop_freefs(vfs_t *); 353 extern int fsop_sync_by_kind(int, short, cred_t *); 354 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t); 355 356 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr) 357 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr) 358 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp) 359 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp) 360 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr) 361 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp) 362 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init) 363 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp) 364 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns) 365 366 #define VFSNAME_MOUNT "mount" 367 #define VFSNAME_UNMOUNT "unmount" 368 #define VFSNAME_ROOT "root" 369 #define VFSNAME_STATVFS "statvfs" 370 #define VFSNAME_SYNC "sync" 371 #define VFSNAME_VGET "vget" 372 #define VFSNAME_MOUNTROOT "mountroot" 373 #define VFSNAME_FREEVFS "freevfs" 374 #define VFSNAME_VNSTATE "vnstate" 375 /* 376 * Filesystem type switch table. 377 */ 378 379 typedef struct vfssw { 380 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */ 381 int (*vsw_init) (int, char *); 382 /* init routine (for non-loadable fs only) */ 383 int vsw_flag; /* flags */ 384 mntopts_t vsw_optproto; /* mount options table prototype */ 385 uint_t vsw_count; /* count of references */ 386 kmutex_t vsw_lock; /* lock to protect vsw_count */ 387 vfsops_t vsw_vfsops; /* filesystem operations vector */ 388 } vfssw_t; 389 390 /* 391 * Filesystem type definition record. All file systems must export a record 392 * of this type through their modlfs structure. N.B., changing the version 393 * number requires a change in sys/modctl.h. 394 */ 395 396 typedef struct vfsdef_v5 { 397 int def_version; /* structure version, must be first */ 398 char *name; /* filesystem type name */ 399 int (*init) (int, char *); /* init routine */ 400 int flags; /* filesystem flags */ 401 mntopts_t *optproto; /* mount options table prototype */ 402 } vfsdef_v5; 403 404 typedef struct vfsdef_v5 vfsdef_t; 405 406 enum { 407 VFSDEF_VERSION = 5 408 }; 409 410 /* Specific to libfksmbfs */ 411 int fake_installfs(vfsdef_t *); 412 int fake_removefs(vfsdef_t *); 413 414 /* 415 * flags for vfssw and vfsdef 416 */ 417 #define VSW_HASPROTO 0x01 /* struct has a mount options prototype */ 418 #define VSW_CANRWRO 0x02 /* file system can transition from rw to ro */ 419 #define VSW_CANREMOUNT 0x04 /* file system supports remounts */ 420 #define VSW_NOTZONESAFE 0x08 /* zone_enter(2) should fail for these files */ 421 #define VSW_VOLATILEDEV 0x10 /* vfs_dev can change each time fs is mounted */ 422 #define VSW_STATS 0x20 /* file system can collect stats */ 423 #define VSW_XID 0x40 /* file system supports extended ids */ 424 #define VSW_CANLOFI 0x80 /* file system supports lofi mounts */ 425 #define VSW_ZMOUNT 0x100 /* file system always allowed in a zone */ 426 #define VSW_MOUNTDEV 0x200 /* file system is mounted via device path */ 427 428 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */ 429 430 /* 431 * A flag for vfs_setpath(). 432 */ 433 #define VFSSP_VERBATIM 0x1 /* do not prefix the supplied path */ 434 435 #if defined(_KERNEL) || defined(_FAKE_KERNEL) 436 437 /* 438 * Private vfs data, NOT to be used by a file system implementation. 439 */ 440 441 #define VFS_FEATURE_MAXSZ 4 442 443 typedef struct vfs_impl { 444 /* Counted array - Bitmap of vfs features */ 445 uint32_t vi_featureset[VFS_FEATURE_MAXSZ]; 446 /* 447 * Support for statistics on the vnode operations 448 */ 449 vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */ 450 vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */ 451 vopstats_t vi_vopstats; /* per-mount vnode op stats */ 452 453 timespec_t vi_hrctime; /* High-res creation time */ 454 455 zone_ref_t vi_zone_ref; /* reference to zone */ 456 } vfs_impl_t; 457 458 /* 459 * Public operations. 460 */ 461 struct umounta; 462 struct statvfsa; 463 struct fstatvfsa; 464 465 void vfs_freevfsops(vfsops_t *); 466 int vfs_freevfsops_by_type(int); 467 void vfs_setops(vfs_t *, vfsops_t *); 468 vfsops_t *vfs_getops(vfs_t *vfsp); 469 int vfs_matchops(vfs_t *, vfsops_t *); 470 int vfs_can_sync(vfs_t *vfsp); 471 vfs_t *vfs_alloc(int); 472 void vfs_free(vfs_t *); 473 void vfs_init(vfs_t *vfsp, vfsops_t *, void *); 474 void vfsimpl_setup(vfs_t *vfsp); 475 void vfsimpl_teardown(vfs_t *vfsp); 476 void vn_exists(vnode_t *); 477 void vn_idle(vnode_t *); 478 void vn_reclaim(vnode_t *); 479 void vn_invalid(vnode_t *); 480 481 int rootconf(void); 482 int domount(char *, struct mounta *, vnode_t *, struct cred *, 483 struct vfs **); 484 int dounmount(struct vfs *, int, cred_t *); 485 int vfs_lock(struct vfs *); 486 int vfs_rlock(struct vfs *); 487 void vfs_lock_wait(struct vfs *); 488 void vfs_rlock_wait(struct vfs *); 489 void vfs_unlock(struct vfs *); 490 int vfs_lock_held(struct vfs *); 491 struct _kthread *vfs_lock_owner(struct vfs *); 492 void sync(void); 493 void vfs_sync(int); 494 void vfs_mountroot(void); 495 void vfs_add(vnode_t *, struct vfs *, int); 496 void vfs_remove(struct vfs *); 497 498 /* VFS feature routines */ 499 void vfs_set_feature(vfs_t *, vfs_feature_t); 500 void vfs_clear_feature(vfs_t *, vfs_feature_t); 501 int vfs_has_feature(vfs_t *, vfs_feature_t); 502 void vfs_propagate_features(vfs_t *, vfs_t *); 503 504 /* The following functions are not for general use by filesystems */ 505 506 void vfs_createopttbl(mntopts_t *, const char *); 507 void vfs_copyopttbl(const mntopts_t *, mntopts_t *); 508 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *); 509 void vfs_freeopttbl(mntopts_t *); 510 void vfs_parsemntopts(mntopts_t *, char *, int); 511 int vfs_buildoptionstr(const mntopts_t *, char *, int); 512 struct mntopt *vfs_hasopt(const mntopts_t *, const char *); 513 void vfs_mnttab_modtimeupd(void); 514 515 void vfs_clearmntopt(struct vfs *, const char *); 516 void vfs_setmntopt(struct vfs *, const char *, const char *, int); 517 void vfs_setresource(struct vfs *, const char *, uint32_t); 518 void vfs_setmntpoint(struct vfs *, const char *, uint32_t); 519 refstr_t *vfs_getresource(const struct vfs *); 520 refstr_t *vfs_getmntpoint(const struct vfs *); 521 int vfs_optionisset(const struct vfs *, const char *, char **); 522 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *); 523 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *); 524 void vfs_syncall(void); 525 void vfsinit(void); 526 void vfs_unmountall(void); 527 void vfs_make_fsid(fsid_t *, dev_t, int); 528 void vfs_addmip(dev_t, struct vfs *); 529 void vfs_delmip(struct vfs *); 530 int vfs_devismounted(dev_t); 531 int vfs_devmounting(dev_t, struct vfs *); 532 int vfs_opsinuse(vfsops_t *); 533 struct vfs *getvfs(fsid_t *); 534 struct vfs *vfs_dev2vfsp(dev_t); 535 struct vfs *vfs_mntpoint2vfsp(const char *); 536 struct vfssw *allocate_vfssw(const char *); 537 struct vfssw *vfs_getvfssw(const char *); 538 struct vfssw *vfs_getvfsswbyname(const char *); 539 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *); 540 void vfs_refvfssw(struct vfssw *); 541 void vfs_unrefvfssw(struct vfssw *); 542 uint_t vf_to_stf(uint_t); 543 void vfs_mnttab_modtime(timespec_t *); 544 void vfs_mnttab_poll(timespec_t *, struct pollhead **); 545 546 void vfs_list_lock(void); 547 void vfs_list_read_lock(void); 548 void vfs_list_unlock(void); 549 void vfs_list_add(struct vfs *); 550 void vfs_list_remove(struct vfs *); 551 void vfs_hold(vfs_t *vfsp); 552 void vfs_rele(vfs_t *vfsp); 553 void fs_freevfs(vfs_t *); 554 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype); 555 556 int vfs_zone_change_safe(vfs_t *); 557 558 int vfs_get_lofi(vfs_t *, vnode_t **); 559 560 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1)) 561 #define VFS_ON_LIST(vfsp) \ 562 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL) 563 564 /* 565 * Globals. 566 */ 567 568 extern struct vfssw vfssw[]; /* table of filesystem types */ 569 extern krwlock_t vfssw_lock; 570 extern char rootfstype[]; /* name of root fstype */ 571 extern const int nfstype; /* # of elements in vfssw array */ 572 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */ 573 574 /* 575 * The following variables are private to the the kernel's vfs layer. File 576 * system implementations should not access them. 577 */ 578 extern struct vfs *rootvfs; /* ptr to root vfs structure */ 579 typedef struct { 580 struct vfs *rvfs_head; /* head vfs in chain */ 581 kmutex_t rvfs_lock; /* mutex protecting this chain */ 582 uint32_t rvfs_len; /* length of this chain */ 583 } rvfs_t; 584 extern rvfs_t *rvfs_list; 585 extern int vfshsz; /* # of elements in rvfs_head array */ 586 extern const mntopts_t vfs_mntopts; /* globally recognized options */ 587 588 #endif /* defined(_KERNEL) */ 589 590 #define VFS_HOLD(vfsp) { \ 591 vfs_hold(vfsp); \ 592 } 593 594 #define VFS_RELE(vfsp) { \ 595 vfs_rele(vfsp); \ 596 } 597 598 #define VFS_INIT(vfsp, op, data) { \ 599 vfs_init((vfsp), (op), (data)); \ 600 } 601 602 603 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0) 604 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0') 605 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER)) 606 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 607 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER)) 608 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 609 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock)) 610 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock)) 611 /* 612 * VFS_SYNC flags. 613 */ 614 #define SYNC_ATTR 0x01 /* sync attributes only */ 615 #define SYNC_CLOSE 0x02 /* close open file */ 616 #define SYNC_ALL 0x04 /* force to sync all fs */ 617 618 #ifdef __cplusplus 619 } 620 #endif 621 622 #endif /* _SYS_VFS_H */ 623