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