usr/src/uts/common/sys/vfs.h

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