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