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 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 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 #include <sys/zone.h> 38 #include <sys/types.h> 39 #include <sys/t_lock.h> 40 #include <sys/cred.h> 41 #include <sys/vnode.h> 42 #include <sys/statvfs.h> 43 #include <sys/refstr.h> 44 #include <sys/avl.h> 45 #include <sys/time.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 * Many underlying file systems cast a struct fid into other 75 * file system dependent structures which may require 4 byte alignment. 76 * Because a fid starts with a short it may not be 4 byte aligned, the 77 * fid_pad will force the alignment. 78 */ 79 #define MAXFIDSZ 64 80 #define OLD_MAXFIDSZ 16 81 82 typedef struct fid { 83 union { 84 long fid_pad; 85 struct { 86 ushort_t len; /* length of data in bytes */ 87 char data[MAXFIDSZ]; /* data (variable len) */ 88 } _fid; 89 } un; 90 } fid_t; 91 92 #ifdef _SYSCALL32 93 /* 94 * Solaris 64 - use old-style cache format with 32-bit aligned fid for on-disk 95 * struct compatibility. 96 */ 97 typedef struct fid32 { 98 union { 99 int32_t fid_pad; 100 struct { 101 uint16_t len; /* length of data in bytes */ 102 char data[MAXFIDSZ]; /* data (variable len) */ 103 } _fid; 104 } un; 105 } fid32_t; 106 #else /* not _SYSCALL32 */ 107 #define fid32 fid 108 typedef fid_t fid32_t; 109 #endif /* _SYSCALL32 */ 110 111 #define fid_len un._fid.len 112 #define fid_data un._fid.data 113 114 /* 115 * Structure defining a mount option for a filesystem. 116 * option names are found in mntent.h 117 */ 118 typedef struct mntopt { 119 char *mo_name; /* option name */ 120 char **mo_cancel; /* list of options cancelled by this one */ 121 char *mo_arg; /* argument string for this option */ 122 int mo_flags; /* flags for this mount option */ 123 void *mo_data; /* filesystem specific data */ 124 } mntopt_t; 125 126 /* 127 * Flags that apply to mount options 128 */ 129 130 #define MO_SET 0x01 /* option is set */ 131 #define MO_NODISPLAY 0x02 /* option not listed in mnttab */ 132 #define MO_HASVALUE 0x04 /* option takes a value */ 133 #define MO_IGNORE 0x08 /* option ignored by parser */ 134 #define MO_DEFAULT MO_SET /* option is on by default */ 135 #define MO_TAG 0x10 /* flags a tag set by user program */ 136 #define MO_EMPTY 0x20 /* empty space in option table */ 137 138 #define VFS_NOFORCEOPT 0x01 /* honor MO_IGNORE (don't set option) */ 139 #define VFS_DISPLAY 0x02 /* Turn off MO_NODISPLAY bit for opt */ 140 #define VFS_NODISPLAY 0x04 /* Turn on MO_NODISPLAY bit for opt */ 141 #define VFS_CREATEOPT 0x08 /* Create the opt if it's not there */ 142 143 /* 144 * Structure holding mount option strings for the mounted file system. 145 */ 146 typedef struct mntopts { 147 uint_t mo_count; /* number of entries in table */ 148 mntopt_t *mo_list; /* list of mount options */ 149 } mntopts_t; 150 151 /* 152 * The kstat structures associated with the vopstats are kept in an 153 * AVL tree. This is to avoid the case where a file system does not 154 * use a unique fsid_t for each vfs (e.g., namefs). In order to do 155 * this, we need a structure that the AVL tree can use that also 156 * references the kstat. 157 * Note that the vks_fsid is generated from the value reported by 158 * VFS_STATVFS(). 159 */ 160 typedef struct vskstat_anchor { 161 avl_node_t vsk_node; /* Required for use by AVL routines */ 162 kstat_t *vsk_ksp; /* kstat structure for vopstats */ 163 ulong_t vsk_fsid; /* fsid associated w/this FS */ 164 } vsk_anchor_t; 165 166 extern avl_tree_t vskstat_tree; 167 extern kmutex_t vskstat_tree_lock; 168 169 /* 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 minor_t vfs_lofi_minor; /* minor 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 /* 240 * VFS flags. 241 */ 242 #define VFS_RDONLY 0x01 /* read-only vfs */ 243 #define VFS_NOMNTTAB 0x02 /* vfs not seen in mnttab */ 244 #define VFS_NOSETUID 0x08 /* setuid disallowed */ 245 #define VFS_REMOUNT 0x10 /* modify mount options only */ 246 #define VFS_NOTRUNC 0x20 /* does not truncate long file names */ 247 #define VFS_UNLINKABLE 0x40 /* unlink(2) can be applied to root */ 248 #define VFS_PXFS 0x80 /* clustering: global fs proxy vfs */ 249 #define VFS_UNMOUNTED 0x100 /* file system has been unmounted */ 250 #define VFS_NBMAND 0x200 /* allow non-blocking mandatory locks */ 251 #define VFS_XATTR 0x400 /* fs supports extended attributes */ 252 #define VFS_NODEVICES 0x800 /* device-special files disallowed */ 253 #define VFS_NOEXEC 0x1000 /* executables disallowed */ 254 #define VFS_STATS 0x2000 /* file system can collect stats */ 255 #define VFS_XID 0x4000 /* file system supports extended ids */ 256 257 #define VFS_NORESOURCE "unspecified_resource" 258 #define VFS_NOMNTPT "unspecified_mountpoint" 259 260 /* 261 * VFS features are implemented as bits set in the vfs_t. 262 * The vfs_feature_t typedef is a 64-bit number that will translate 263 * into an element in an array of bitmaps and a bit in that element. 264 * Developers must not depend on the implementation of this and 265 * need to use vfs_has_feature()/vfs_set_feature() routines. 266 */ 267 typedef uint64_t vfs_feature_t; 268 269 #define VFSFT_XVATTR 0x100000001 /* Supports xvattr for attrs */ 270 #define VFSFT_CASEINSENSITIVE 0x100000002 /* Supports case-insensitive */ 271 #define VFSFT_NOCASESENSITIVE 0x100000004 /* NOT case-sensitive */ 272 #define VFSFT_DIRENTFLAGS 0x100000008 /* Supports dirent flags */ 273 #define VFSFT_ACLONCREATE 0x100000010 /* Supports ACL on create */ 274 #define VFSFT_ACEMASKONACCESS 0x100000020 /* Can use ACEMASK for access */ 275 #define VFSFT_SYSATTR_VIEWS 0x100000040 /* Supports sysattr view i/f */ 276 #define VFSFT_ACCESS_FILTER 0x100000080 /* dirents filtered by access */ 277 #define VFSFT_REPARSE 0x100000100 /* Supports reparse point */ 278 #define VFSFT_ZEROCOPY_SUPPORTED 0x100000200 279 /* Support loaning /returning cache buffer */ 280 /* 281 * Argument structure for mount(2). 282 * 283 * Flags are defined in <sys/mount.h>. 284 * 285 * Note that if the MS_SYSSPACE bit is set in flags, the pointer fields in 286 * this structure are to be interpreted as kernel addresses. File systems 287 * should be prepared for this possibility. 288 */ 289 struct mounta { 290 char *spec; 291 char *dir; 292 int flags; 293 char *fstype; 294 char *dataptr; 295 int datalen; 296 char *optptr; 297 int optlen; 298 }; 299 300 /* 301 * Reasons for calling the vfs_mountroot() operation. 302 */ 303 enum whymountroot { ROOT_INIT, ROOT_REMOUNT, ROOT_UNMOUNT}; 304 typedef enum whymountroot whymountroot_t; 305 306 /* 307 * Reasons for calling the VFS_VNSTATE(): 308 */ 309 enum vntrans { 310 VNTRANS_EXISTS, 311 VNTRANS_IDLED, 312 VNTRANS_RECLAIMED, 313 VNTRANS_DESTROYED 314 }; 315 typedef enum vntrans vntrans_t; 316 317 /* 318 * VFS_OPS defines all the vfs operations. It is used to define 319 * the vfsops structure (below) and the fs_func_p union (vfs_opreg.h). 320 */ 321 #define VFS_OPS \ 322 int (*vfs_mount)(vfs_t *, vnode_t *, struct mounta *, cred_t *); \ 323 int (*vfs_unmount)(vfs_t *, int, cred_t *); \ 324 int (*vfs_root)(vfs_t *, vnode_t **); \ 325 int (*vfs_statvfs)(vfs_t *, statvfs64_t *); \ 326 int (*vfs_sync)(vfs_t *, short, cred_t *); \ 327 int (*vfs_vget)(vfs_t *, vnode_t **, fid_t *); \ 328 int (*vfs_mountroot)(vfs_t *, enum whymountroot); \ 329 void (*vfs_freevfs)(vfs_t *); \ 330 int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t) /* NB: No ";" */ 331 332 /* 333 * Operations supported on virtual file system. 334 */ 335 struct vfsops { 336 VFS_OPS; /* Signature of all vfs operations (vfsops) */ 337 }; 338 339 extern int fsop_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *); 340 extern int fsop_unmount(vfs_t *, int, cred_t *); 341 extern int fsop_root(vfs_t *, vnode_t **); 342 extern int fsop_statfs(vfs_t *, statvfs64_t *); 343 extern int fsop_sync(vfs_t *, short, cred_t *); 344 extern int fsop_vget(vfs_t *, vnode_t **, fid_t *); 345 extern int fsop_mountroot(vfs_t *, enum whymountroot); 346 extern void fsop_freefs(vfs_t *); 347 extern int fsop_sync_by_kind(int, short, cred_t *); 348 extern int fsop_vnstate(vfs_t *, vnode_t *, vntrans_t); 349 350 #define VFS_MOUNT(vfsp, mvp, uap, cr) fsop_mount(vfsp, mvp, uap, cr) 351 #define VFS_UNMOUNT(vfsp, flag, cr) fsop_unmount(vfsp, flag, cr) 352 #define VFS_ROOT(vfsp, vpp) fsop_root(vfsp, vpp) 353 #define VFS_STATVFS(vfsp, sp) fsop_statfs(vfsp, sp) 354 #define VFS_SYNC(vfsp, flag, cr) fsop_sync(vfsp, flag, cr) 355 #define VFS_VGET(vfsp, vpp, fidp) fsop_vget(vfsp, vpp, fidp) 356 #define VFS_MOUNTROOT(vfsp, init) fsop_mountroot(vfsp, init) 357 #define VFS_FREEVFS(vfsp) fsop_freefs(vfsp) 358 #define VFS_VNSTATE(vfsp, vn, ns) fsop_vnstate(vfsp, vn, ns) 359 360 #define VFSNAME_MOUNT "mount" 361 #define VFSNAME_UNMOUNT "unmount" 362 #define VFSNAME_ROOT "root" 363 #define VFSNAME_STATVFS "statvfs" 364 #define VFSNAME_SYNC "sync" 365 #define VFSNAME_VGET "vget" 366 #define VFSNAME_MOUNTROOT "mountroot" 367 #define VFSNAME_FREEVFS "freevfs" 368 #define VFSNAME_VNSTATE "vnstate" 369 /* 370 * Filesystem type switch table. 371 */ 372 373 typedef struct vfssw { 374 char *vsw_name; /* type name -- max len _ST_FSTYPSZ */ 375 int (*vsw_init) (int, char *); 376 /* init routine (for non-loadable fs only) */ 377 int vsw_flag; /* flags */ 378 mntopts_t vsw_optproto; /* mount options table prototype */ 379 uint_t vsw_count; /* count of references */ 380 kmutex_t vsw_lock; /* lock to protect vsw_count */ 381 vfsops_t vsw_vfsops; /* filesystem operations vector */ 382 } vfssw_t; 383 384 /* 385 * Filesystem type definition record. All file systems must export a record 386 * of this type through their modlfs structure. N.B., changing the version 387 * number requires a change in sys/modctl.h. 388 */ 389 390 typedef struct vfsdef_v5 { 391 int def_version; /* structure version, must be first */ 392 char *name; /* filesystem type name */ 393 int (*init) (int, char *); /* init routine */ 394 int flags; /* filesystem flags */ 395 mntopts_t *optproto; /* mount options table prototype */ 396 } vfsdef_v5; 397 398 typedef struct vfsdef_v5 vfsdef_t; 399 400 enum { 401 VFSDEF_VERSION = 5 402 }; 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 #define VSW_XID 0x40 /* file system supports extended ids */ 414 #define VSW_CANLOFI 0x80 /* file system supports lofi mounts */ 415 #define VSW_ZMOUNT 0x100 /* file system always allowed in a zone */ 416 417 #define VSW_INSTALLED 0x8000 /* this vsw is associated with a file system */ 418 419 /* 420 * A flag for vfs_setpath(). 421 */ 422 #define VFSSP_VERBATIM 0x1 /* do not prefix the supplied path */ 423 424 #if defined(_KERNEL) || defined(_FAKE_KERNEL) 425 426 /* 427 * Private vfs data, NOT to be used by a file system implementation. 428 */ 429 430 #define VFS_FEATURE_MAXSZ 4 431 432 typedef struct vfs_impl { 433 /* Counted array - Bitmap of vfs features */ 434 uint32_t vi_featureset[VFS_FEATURE_MAXSZ]; 435 /* 436 * Support for statistics on the vnode operations 437 */ 438 vsk_anchor_t *vi_vskap; /* anchor for vopstats' kstat */ 439 vopstats_t *vi_fstypevsp; /* ptr to per-fstype vopstats */ 440 vopstats_t vi_vopstats; /* per-mount vnode op stats */ 441 442 timespec_t vi_hrctime; /* High-res creation time */ 443 444 zone_ref_t vi_zone_ref; /* reference to zone */ 445 } vfs_impl_t; 446 447 /* 448 * Public operations. 449 */ 450 struct umounta; 451 struct statvfsa; 452 struct fstatvfsa; 453 454 void vfs_freevfsops(vfsops_t *); 455 int vfs_freevfsops_by_type(int); 456 void vfs_setops(vfs_t *, vfsops_t *); 457 vfsops_t *vfs_getops(vfs_t *vfsp); 458 int vfs_matchops(vfs_t *, vfsops_t *); 459 int vfs_can_sync(vfs_t *vfsp); 460 vfs_t *vfs_alloc(int); 461 void vfs_free(vfs_t *); 462 void vfs_init(vfs_t *vfsp, vfsops_t *, void *); 463 void vfsimpl_setup(vfs_t *vfsp); 464 void vfsimpl_teardown(vfs_t *vfsp); 465 void vn_exists(vnode_t *); 466 void vn_idle(vnode_t *); 467 void vn_reclaim(vnode_t *); 468 void vn_invalid(vnode_t *); 469 470 int rootconf(void); 471 int svm_rootconf(void); 472 int domount(char *, struct mounta *, vnode_t *, struct cred *, 473 struct vfs **); 474 int dounmount(struct vfs *, int, cred_t *); 475 int vfs_lock(struct vfs *); 476 int vfs_rlock(struct vfs *); 477 void vfs_lock_wait(struct vfs *); 478 void vfs_rlock_wait(struct vfs *); 479 void vfs_unlock(struct vfs *); 480 int vfs_lock_held(struct vfs *); 481 struct _kthread *vfs_lock_owner(struct vfs *); 482 void sync(void); 483 void vfs_sync(int); 484 void vfs_mountroot(void); 485 void vfs_add(vnode_t *, struct vfs *, int); 486 void vfs_remove(struct vfs *); 487 488 /* VFS feature routines */ 489 void vfs_set_feature(vfs_t *, vfs_feature_t); 490 void vfs_clear_feature(vfs_t *, vfs_feature_t); 491 int vfs_has_feature(vfs_t *, vfs_feature_t); 492 void vfs_propagate_features(vfs_t *, vfs_t *); 493 494 /* The following functions are not for general use by filesystems */ 495 496 void vfs_createopttbl(mntopts_t *, const char *); 497 void vfs_copyopttbl(const mntopts_t *, mntopts_t *); 498 void vfs_mergeopttbl(const mntopts_t *, const mntopts_t *, mntopts_t *); 499 void vfs_freeopttbl(mntopts_t *); 500 void vfs_parsemntopts(mntopts_t *, char *, int); 501 int vfs_buildoptionstr(const mntopts_t *, char *, int); 502 struct mntopt *vfs_hasopt(const mntopts_t *, const char *); 503 void vfs_mnttab_modtimeupd(void); 504 505 void vfs_clearmntopt(struct vfs *, const char *); 506 void vfs_setmntopt(struct vfs *, const char *, const char *, int); 507 void vfs_setresource(struct vfs *, const char *, uint32_t); 508 void vfs_setmntpoint(struct vfs *, const char *, uint32_t); 509 refstr_t *vfs_getresource(const struct vfs *); 510 refstr_t *vfs_getmntpoint(const struct vfs *); 511 int vfs_optionisset(const struct vfs *, const char *, char **); 512 int vfs_settag(uint_t, uint_t, const char *, const char *, cred_t *); 513 int vfs_clrtag(uint_t, uint_t, const char *, const char *, cred_t *); 514 void vfs_syncall(void); 515 void vfs_syncprogress(void); 516 void vfsinit(void); 517 void vfs_unmountall(void); 518 void vfs_make_fsid(fsid_t *, dev_t, int); 519 void vfs_addmip(dev_t, struct vfs *); 520 void vfs_delmip(struct vfs *); 521 int vfs_devismounted(dev_t); 522 int vfs_devmounting(dev_t, struct vfs *); 523 int vfs_opsinuse(vfsops_t *); 524 struct vfs *getvfs(fsid_t *); 525 struct vfs *vfs_dev2vfsp(dev_t); 526 struct vfs *vfs_mntpoint2vfsp(const char *); 527 struct vfssw *allocate_vfssw(const char *); 528 struct vfssw *vfs_getvfssw(const char *); 529 struct vfssw *vfs_getvfsswbyname(const char *); 530 struct vfssw *vfs_getvfsswbyvfsops(vfsops_t *); 531 void vfs_refvfssw(struct vfssw *); 532 void vfs_unrefvfssw(struct vfssw *); 533 uint_t vf_to_stf(uint_t); 534 void vfs_mnttab_modtime(timespec_t *); 535 void vfs_mnttab_poll(timespec_t *, struct pollhead **); 536 537 void vfs_list_lock(void); 538 void vfs_list_read_lock(void); 539 void vfs_list_unlock(void); 540 void vfs_list_add(struct vfs *); 541 void vfs_list_remove(struct vfs *); 542 void vfs_hold(vfs_t *vfsp); 543 void vfs_rele(vfs_t *vfsp); 544 void fs_freevfs(vfs_t *); 545 void vfs_root_redev(vfs_t *vfsp, dev_t ndev, int fstype); 546 547 int vfs_zone_change_safe(vfs_t *); 548 549 int vfs_get_lofi(vfs_t *, vnode_t **); 550 551 #define VFSHASH(maj, min) (((int)((maj)+(min))) & (vfshsz - 1)) 552 #define VFS_ON_LIST(vfsp) \ 553 ((vfsp)->vfs_next != (vfsp) && (vfsp)->vfs_next != NULL) 554 555 /* 556 * Globals. 557 */ 558 559 extern struct vfssw vfssw[]; /* table of filesystem types */ 560 extern krwlock_t vfssw_lock; 561 extern char rootfstype[]; /* name of root fstype */ 562 extern const int nfstype; /* # of elements in vfssw array */ 563 extern vfsops_t *EIO_vfsops; /* operations for vfs being torn-down */ 564 565 /* 566 * The following variables are private to the the kernel's vfs layer. File 567 * system implementations should not access them. 568 */ 569 extern struct vfs *rootvfs; /* ptr to root vfs structure */ 570 typedef struct { 571 struct vfs *rvfs_head; /* head vfs in chain */ 572 kmutex_t rvfs_lock; /* mutex protecting this chain */ 573 uint32_t rvfs_len; /* length of this chain */ 574 } rvfs_t; 575 extern rvfs_t *rvfs_list; 576 extern int vfshsz; /* # of elements in rvfs_head array */ 577 extern const mntopts_t vfs_mntopts; /* globally recognized options */ 578 579 #endif /* defined(_KERNEL) */ 580 581 #define VFS_HOLD(vfsp) { \ 582 vfs_hold(vfsp); \ 583 } 584 585 #define VFS_RELE(vfsp) { \ 586 vfs_rele(vfsp); \ 587 } 588 589 #define VFS_INIT(vfsp, op, data) { \ 590 vfs_init((vfsp), (op), (data)); \ 591 } 592 593 594 #define VFS_INSTALLED(vfsswp) (((vfsswp)->vsw_flag & VSW_INSTALLED) != 0) 595 #define ALLOCATED_VFSSW(vswp) ((vswp)->vsw_name[0] != '\0') 596 #define RLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_READER)) 597 #define RUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 598 #define WLOCK_VFSSW() (rw_enter(&vfssw_lock, RW_WRITER)) 599 #define WUNLOCK_VFSSW() (rw_exit(&vfssw_lock)) 600 #define VFSSW_LOCKED() (RW_LOCK_HELD(&vfssw_lock)) 601 #define VFSSW_WRITE_LOCKED() (RW_WRITE_HELD(&vfssw_lock)) 602 /* 603 * VFS_SYNC flags. 604 */ 605 #define SYNC_ATTR 0x01 /* sync attributes only */ 606 #define SYNC_CLOSE 0x02 /* close open file */ 607 #define SYNC_ALL 0x04 /* force to sync all fs */ 608 609 #ifdef __cplusplus 610 } 611 #endif 612 613 #endif /* _SYS_VFS_H */ 614