The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/mount.h

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    1 /*-
    2  * Copyright (c) 1989, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)mount.h     8.21 (Berkeley) 5/20/95
   30  * $FreeBSD: releng/11.0/sys/sys/mount.h 302388 2016-07-07 09:03:57Z trasz $
   31  */
   32 
   33 #ifndef _SYS_MOUNT_H_
   34 #define _SYS_MOUNT_H_
   35 
   36 #include <sys/ucred.h>
   37 #include <sys/queue.h>
   38 #ifdef _KERNEL
   39 #include <sys/lock.h>
   40 #include <sys/lockmgr.h>
   41 #include <sys/_mutex.h>
   42 #include <sys/_sx.h>
   43 #endif
   44 
   45 /*
   46  * NOTE: When changing statfs structure, mount structure, MNT_* flags or
   47  * MNTK_* flags also update DDB show mount command in vfs_subr.c.
   48  */
   49 
   50 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
   51 
   52 /*
   53  * File identifier.
   54  * These are unique per filesystem on a single machine.
   55  */
   56 #define MAXFIDSZ        16
   57 
   58 struct fid {
   59         u_short         fid_len;                /* length of data in bytes */
   60         u_short         fid_data0;              /* force longword alignment */
   61         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   62 };
   63 
   64 /*
   65  * filesystem statistics
   66  */
   67 #define MFSNAMELEN      16              /* length of type name including null */
   68 #define MNAMELEN        88              /* size of on/from name bufs */
   69 #define STATFS_VERSION  0x20030518      /* current version number */
   70 struct statfs {
   71         uint32_t f_version;             /* structure version number */
   72         uint32_t f_type;                /* type of filesystem */
   73         uint64_t f_flags;               /* copy of mount exported flags */
   74         uint64_t f_bsize;               /* filesystem fragment size */
   75         uint64_t f_iosize;              /* optimal transfer block size */
   76         uint64_t f_blocks;              /* total data blocks in filesystem */
   77         uint64_t f_bfree;               /* free blocks in filesystem */
   78         int64_t  f_bavail;              /* free blocks avail to non-superuser */
   79         uint64_t f_files;               /* total file nodes in filesystem */
   80         int64_t  f_ffree;               /* free nodes avail to non-superuser */
   81         uint64_t f_syncwrites;          /* count of sync writes since mount */
   82         uint64_t f_asyncwrites;         /* count of async writes since mount */
   83         uint64_t f_syncreads;           /* count of sync reads since mount */
   84         uint64_t f_asyncreads;          /* count of async reads since mount */
   85         uint64_t f_spare[10];           /* unused spare */
   86         uint32_t f_namemax;             /* maximum filename length */
   87         uid_t     f_owner;              /* user that mounted the filesystem */
   88         fsid_t    f_fsid;               /* filesystem id */
   89         char      f_charspare[80];          /* spare string space */
   90         char      f_fstypename[MFSNAMELEN]; /* filesystem type name */
   91         char      f_mntfromname[MNAMELEN];  /* mounted filesystem */
   92         char      f_mntonname[MNAMELEN];    /* directory on which mounted */
   93 };
   94 
   95 #ifdef _KERNEL
   96 #define OMFSNAMELEN     16      /* length of fs type name, including null */
   97 #define OMNAMELEN       (88 - 2 * sizeof(long)) /* size of on/from name bufs */
   98 
   99 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
  100 /* XXX statfs.2 is out of date with read counter changes here. */
  101 struct ostatfs {
  102         long    f_spare2;               /* placeholder */
  103         long    f_bsize;                /* fundamental filesystem block size */
  104         long    f_iosize;               /* optimal transfer block size */
  105         long    f_blocks;               /* total data blocks in filesystem */
  106         long    f_bfree;                /* free blocks in fs */
  107         long    f_bavail;               /* free blocks avail to non-superuser */
  108         long    f_files;                /* total file nodes in filesystem */
  109         long    f_ffree;                /* free file nodes in fs */
  110         fsid_t  f_fsid;                 /* filesystem id */
  111         uid_t   f_owner;                /* user that mounted the filesystem */
  112         int     f_type;                 /* type of filesystem */
  113         int     f_flags;                /* copy of mount exported flags */
  114         long    f_syncwrites;           /* count of sync writes since mount */
  115         long    f_asyncwrites;          /* count of async writes since mount */
  116         char    f_fstypename[OMFSNAMELEN]; /* fs type name */
  117         char    f_mntonname[OMNAMELEN]; /* directory on which mounted */
  118         long    f_syncreads;            /* count of sync reads since mount */
  119         long    f_asyncreads;           /* count of async reads since mount */
  120         short   f_spares1;              /* unused spare */
  121         char    f_mntfromname[OMNAMELEN];/* mounted filesystem */
  122         short   f_spares2;              /* unused spare */
  123         /*
  124          * XXX on machines where longs are aligned to 8-byte boundaries, there
  125          * is an unnamed int32_t here.  This spare was after the apparent end
  126          * of the struct until we bit off the read counters from f_mntonname.
  127          */
  128         long    f_spare[2];             /* unused spare */
  129 };
  130 
  131 TAILQ_HEAD(vnodelst, vnode);
  132 
  133 /* Mount options list */
  134 TAILQ_HEAD(vfsoptlist, vfsopt);
  135 struct vfsopt {
  136         TAILQ_ENTRY(vfsopt) link;
  137         char    *name;
  138         void    *value;
  139         int     len;
  140         int     pos;
  141         int     seen;
  142 };
  143 
  144 /*
  145  * Structure per mounted filesystem.  Each mounted filesystem has an
  146  * array of operations and an instance record.  The filesystems are
  147  * put on a doubly linked list.
  148  *
  149  * Lock reference:
  150  *      m - mountlist_mtx
  151  *      i - interlock
  152  *      v - vnode freelist mutex
  153  *
  154  * Unmarked fields are considered stable as long as a ref is held.
  155  *
  156  */
  157 struct mount {
  158         struct mtx      mnt_mtx;                /* mount structure interlock */
  159         int             mnt_gen;                /* struct mount generation */
  160 #define mnt_startzero   mnt_list
  161         TAILQ_ENTRY(mount) mnt_list;            /* (m) mount list */
  162         struct vfsops   *mnt_op;                /* operations on fs */
  163         struct vfsconf  *mnt_vfc;               /* configuration info */
  164         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  165         struct vnode    *mnt_syncer;            /* syncer vnode */
  166         int             mnt_ref;                /* (i) Reference count */
  167         struct vnodelst mnt_nvnodelist;         /* (i) list of vnodes */
  168         int             mnt_nvnodelistsize;     /* (i) # of vnodes */
  169         struct vnodelst mnt_activevnodelist;    /* (v) list of active vnodes */
  170         int             mnt_activevnodelistsize;/* (v) # of active vnodes */
  171         int             mnt_writeopcount;       /* (i) write syscalls pending */
  172         int             mnt_kern_flag;          /* (i) kernel only flags */
  173         uint64_t        mnt_flag;               /* (i) flags shared with user */
  174         struct vfsoptlist *mnt_opt;             /* current mount options */
  175         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  176         int             mnt_maxsymlinklen;      /* max size of short symlink */
  177         struct statfs   mnt_stat;               /* cache of filesystem stats */
  178         struct ucred    *mnt_cred;              /* credentials of mounter */
  179         void *          mnt_data;               /* private data */
  180         time_t          mnt_time;               /* last time written*/
  181         int             mnt_iosize_max;         /* max size for clusters, etc */
  182         struct netexport *mnt_export;           /* export list */
  183         struct label    *mnt_label;             /* MAC label for the fs */
  184         u_int           mnt_hashseed;           /* Random seed for vfs_hash */
  185         int             mnt_lockref;            /* (i) Lock reference count */
  186         int             mnt_secondary_writes;   /* (i) # of secondary writes */
  187         int             mnt_secondary_accwrites;/* (i) secondary wr. starts */
  188         struct thread   *mnt_susp_owner;        /* (i) thread owning suspension */
  189 #define mnt_endzero     mnt_gjprovider
  190         char            *mnt_gjprovider;        /* gjournal provider name */
  191         struct lock     mnt_explock;            /* vfs_export walkers lock */
  192         TAILQ_ENTRY(mount) mnt_upper_link;      /* (m) we in the all uppers */
  193         TAILQ_HEAD(, mount) mnt_uppers;         /* (m) upper mounts over us*/
  194 };
  195 
  196 /*
  197  * Definitions for MNT_VNODE_FOREACH_ALL.
  198  */
  199 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
  200 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
  201 void          __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
  202 
  203 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp)                              \
  204         for (vp = __mnt_vnode_first_all(&(mvp), (mp));                  \
  205                 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
  206 
  207 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp)                            \
  208         do {                                                            \
  209                 MNT_ILOCK(mp);                                          \
  210                 __mnt_vnode_markerfree_all(&(mvp), (mp));               \
  211                 /* MNT_IUNLOCK(mp); -- done in above function */        \
  212                 mtx_assert(MNT_MTX(mp), MA_NOTOWNED);                   \
  213         } while (0)
  214 
  215 /*
  216  * Definitions for MNT_VNODE_FOREACH_ACTIVE.
  217  */
  218 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
  219 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
  220 void          __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
  221 
  222 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp)                           \
  223         for (vp = __mnt_vnode_first_active(&(mvp), (mp));               \
  224                 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
  225 
  226 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp)                         \
  227         __mnt_vnode_markerfree_active(&(mvp), (mp))
  228 
  229 #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
  230 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
  231 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
  232 #define MNT_MTX(mp)     (&(mp)->mnt_mtx)
  233 #define MNT_REF(mp)     (mp)->mnt_ref++
  234 #define MNT_REL(mp)     do {                                            \
  235         KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref"));               \
  236         (mp)->mnt_ref--;                                                \
  237         if ((mp)->mnt_ref == 0)                                         \
  238                 wakeup((mp));                                           \
  239 } while (0)
  240 
  241 #endif /* _KERNEL */
  242 
  243 /*
  244  * User specifiable flags, stored in mnt_flag.
  245  */
  246 #define MNT_RDONLY      0x0000000000000001ULL /* read only filesystem */
  247 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
  248 #define MNT_NOEXEC      0x0000000000000004ULL /* can't exec from filesystem */
  249 #define MNT_NOSUID      0x0000000000000008ULL /* don't honor setuid fs bits */
  250 #define MNT_NFS4ACLS    0x0000000000000010ULL /* enable NFS version 4 ACLs */
  251 #define MNT_UNION       0x0000000000000020ULL /* union with underlying fs */
  252 #define MNT_ASYNC       0x0000000000000040ULL /* fs written asynchronously */
  253 #define MNT_SUIDDIR     0x0000000000100000ULL /* special SUID dir handling */
  254 #define MNT_SOFTDEP     0x0000000000200000ULL /* using soft updates */
  255 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
  256 #define MNT_GJOURNAL    0x0000000002000000ULL /* GEOM journal support enabled */
  257 #define MNT_MULTILABEL  0x0000000004000000ULL /* MAC support for objects */
  258 #define MNT_ACLS        0x0000000008000000ULL /* ACL support enabled */
  259 #define MNT_NOATIME     0x0000000010000000ULL /* dont update file access time */
  260 #define MNT_NOCLUSTERR  0x0000000040000000ULL /* disable cluster read */
  261 #define MNT_NOCLUSTERW  0x0000000080000000ULL /* disable cluster write */
  262 #define MNT_SUJ         0x0000000100000000ULL /* using journaled soft updates */
  263 #define MNT_AUTOMOUNTED 0x0000000200000000ULL /* mounted by automountd(8) */
  264 
  265 /*
  266  * NFS export related mount flags.
  267  */
  268 #define MNT_EXRDONLY    0x0000000000000080ULL   /* exported read only */
  269 #define MNT_EXPORTED    0x0000000000000100ULL   /* filesystem is exported */
  270 #define MNT_DEFEXPORTED 0x0000000000000200ULL   /* exported to the world */
  271 #define MNT_EXPORTANON  0x0000000000000400ULL   /* anon uid mapping for all */
  272 #define MNT_EXKERB      0x0000000000000800ULL   /* exported with Kerberos */
  273 #define MNT_EXPUBLIC    0x0000000020000000ULL   /* public export (WebNFS) */
  274 
  275 /*
  276  * Flags set by internal operations,
  277  * but visible to the user.
  278  * XXX some of these are not quite right.. (I've never seen the root flag set)
  279  */
  280 #define MNT_LOCAL       0x0000000000001000ULL /* filesystem is stored locally */
  281 #define MNT_QUOTA       0x0000000000002000ULL /* quotas are enabled on fs */
  282 #define MNT_ROOTFS      0x0000000000004000ULL /* identifies the root fs */
  283 #define MNT_USER        0x0000000000008000ULL /* mounted by a user */
  284 #define MNT_IGNORE      0x0000000000800000ULL /* do not show entry in df */
  285 
  286 /*
  287  * Mask of flags that are visible to statfs().
  288  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  289  * but the 'mount' program may need changing to handle this.
  290  */
  291 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  292                         MNT_NOSUID      | MNT_UNION     | MNT_SUJ       | \
  293                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  294                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  295                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  296                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  297                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  298                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  299                         MNT_GJOURNAL    | MNT_MULTILABEL | MNT_ACLS     | \
  300                         MNT_NFS4ACLS    | MNT_AUTOMOUNTED)
  301 
  302 /* Mask of flags that can be updated. */
  303 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | \
  304                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  305                         MNT_NOATIME | \
  306                         MNT_NOSYMFOLLOW | MNT_IGNORE    | \
  307                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
  308                         MNT_ACLS        | MNT_USER      | MNT_NFS4ACLS  | \
  309                         MNT_AUTOMOUNTED)
  310 
  311 /*
  312  * External filesystem command modifier flags.
  313  * Unmount can use the MNT_FORCE flag.
  314  * XXX: These are not STATES and really should be somewhere else.
  315  * XXX: MNT_BYFSID and MNT_NONBUSY collide with MNT_ACLS and MNT_MULTILABEL,
  316  *      but because MNT_ACLS and MNT_MULTILABEL are only used for mount(2),
  317  *      and MNT_BYFSID and MNT_NONBUSY are only used for unmount(2),
  318  *      it's harmless.
  319  */
  320 #define MNT_UPDATE      0x0000000000010000ULL /* not real mount, just update */
  321 #define MNT_DELEXPORT   0x0000000000020000ULL /* delete export host lists */
  322 #define MNT_RELOAD      0x0000000000040000ULL /* reload filesystem data */
  323 #define MNT_FORCE       0x0000000000080000ULL /* force unmount or readonly */
  324 #define MNT_SNAPSHOT    0x0000000001000000ULL /* snapshot the filesystem */
  325 #define MNT_NONBUSY     0x0000000004000000ULL /* check vnode use counts. */
  326 #define MNT_BYFSID      0x0000000008000000ULL /* specify filesystem by ID. */
  327 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  328                         MNT_FORCE       | MNT_SNAPSHOT  | MNT_NONBUSY   | \
  329                         MNT_BYFSID)
  330 /*
  331  * Internal filesystem control flags stored in mnt_kern_flag.
  332  *
  333  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  334  * past the mount point.  This keeps the subtree stable during mounts
  335  * and unmounts.
  336  *
  337  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  338  * dounmount() is still waiting to lock the mountpoint. This allows
  339  * the filesystem to cancel operations that might otherwise deadlock
  340  * with the unmount attempt (used by NFS).
  341  *
  342  * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
  343  * to allow for failed unmount attempt to restore the syncer vnode for
  344  * the mount.
  345  */
  346 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  347 #define MNTK_ASYNC      0x00000002      /* filtered async flag */
  348 #define MNTK_SOFTDEP    0x00000004      /* async disabled by softdep */
  349 #define MNTK_NOINSMNTQ  0x00000008      /* insmntque is not allowed */
  350 #define MNTK_DRAINING   0x00000010      /* lock draining is happening */
  351 #define MNTK_REFEXPIRE  0x00000020      /* refcount expiring is happening */
  352 #define MNTK_EXTENDED_SHARED    0x00000040 /* Allow shared locking for more ops */
  353 #define MNTK_SHARED_WRITES      0x00000080 /* Allow shared locking for writes */
  354 #define MNTK_NO_IOPF    0x00000100      /* Disallow page faults during reads
  355                                            and writes. Filesystem shall properly
  356                                            handle i/o state on EFAULT. */
  357 #define MNTK_VGONE_UPPER        0x00000200
  358 #define MNTK_VGONE_WAITER       0x00000400
  359 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800
  360 #define MNTK_MARKER             0x00001000
  361 #define MNTK_UNMAPPED_BUFS      0x00002000
  362 #define MNTK_USES_BCACHE        0x00004000 /* FS uses the buffer cache. */
  363 #define MNTK_NOASYNC    0x00800000      /* disable async */
  364 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  365 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  366 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  367 #define MNTK_SUSPEND2   0x04000000      /* block secondary writes */
  368 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  369 #define MNTK_UNUSED1    0x20000000
  370 #define MNTK_LOOKUP_SHARED      0x40000000 /* FS supports shared lock lookups */
  371 #define MNTK_NOKNOTE    0x80000000      /* Don't send KNOTEs from VOP hooks */
  372 
  373 #ifdef _KERNEL
  374 static inline int
  375 MNT_SHARED_WRITES(struct mount *mp)
  376 {
  377 
  378         return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);
  379 }
  380 
  381 static inline int
  382 MNT_EXTENDED_SHARED(struct mount *mp)
  383 {
  384 
  385         return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0);
  386 }
  387 #endif
  388 
  389 /*
  390  * Sysctl CTL_VFS definitions.
  391  *
  392  * Second level identifier specifies which filesystem. Second level
  393  * identifier VFS_VFSCONF returns information about all filesystems.
  394  * Second level identifier VFS_GENERIC is non-terminal.
  395  */
  396 #define VFS_VFSCONF             0       /* get configured filesystems */
  397 #define VFS_GENERIC             0       /* generic filesystem information */
  398 /*
  399  * Third level identifiers for VFS_GENERIC are given below; third
  400  * level identifiers for specific filesystems are given in their
  401  * mount specific header files.
  402  */
  403 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  404 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  405                                    as next argument */
  406 
  407 /*
  408  * Flags for various system call interfaces.
  409  *
  410  * waitfor flags to vfs_sync() and getfsstat()
  411  */
  412 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  413 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  414 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  415 #define MNT_SUSPEND     4       /* Suspend file system after sync */
  416 
  417 /*
  418  * Generic file handle
  419  */
  420 struct fhandle {
  421         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  422         struct  fid fh_fid;     /* Filesys specific id */
  423 };
  424 typedef struct fhandle  fhandle_t;
  425 
  426 /*
  427  * Old export arguments without security flavor list
  428  */
  429 struct oexport_args {
  430         int     ex_flags;               /* export related flags */
  431         uid_t   ex_root;                /* mapping for root uid */
  432         struct  xucred ex_anon;         /* mapping for anonymous user */
  433         struct  sockaddr *ex_addr;      /* net address to which exported */
  434         u_char  ex_addrlen;             /* and the net address length */
  435         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  436         u_char  ex_masklen;             /* and the smask length */
  437         char    *ex_indexfile;          /* index file for WebNFS URLs */
  438 };
  439 
  440 /*
  441  * Export arguments for local filesystem mount calls.
  442  */
  443 #define MAXSECFLAVORS   5
  444 struct export_args {
  445         int     ex_flags;               /* export related flags */
  446         uid_t   ex_root;                /* mapping for root uid */
  447         struct  xucred ex_anon;         /* mapping for anonymous user */
  448         struct  sockaddr *ex_addr;      /* net address to which exported */
  449         u_char  ex_addrlen;             /* and the net address length */
  450         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  451         u_char  ex_masklen;             /* and the smask length */
  452         char    *ex_indexfile;          /* index file for WebNFS URLs */
  453         int     ex_numsecflavors;       /* security flavor count */
  454         int     ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
  455 };
  456 
  457 /*
  458  * Structure holding information for a publicly exported filesystem
  459  * (WebNFS). Currently the specs allow just for one such filesystem.
  460  */
  461 struct nfs_public {
  462         int             np_valid;       /* Do we hold valid information */
  463         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  464         struct mount    *np_mount;      /* Mountpoint of exported fs */
  465         char            *np_index;      /* Index file */
  466 };
  467 
  468 /*
  469  * Filesystem configuration information. One of these exists for each
  470  * type of filesystem supported by the kernel. These are searched at
  471  * mount time to identify the requested filesystem.
  472  *
  473  * XXX: Never change the first two arguments!
  474  */
  475 struct vfsconf {
  476         u_int   vfc_version;            /* ABI version number */
  477         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  478         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  479         int     vfc_typenum;            /* historic filesystem type number */
  480         int     vfc_refcount;           /* number mounted of this type */
  481         int     vfc_flags;              /* permanent flags */
  482         struct  vfsoptdecl *vfc_opts;   /* mount options */
  483         TAILQ_ENTRY(vfsconf) vfc_list;  /* list of vfscons */
  484 };
  485 
  486 /* Userland version of the struct vfsconf. */
  487 struct xvfsconf {
  488         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  489         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  490         int     vfc_typenum;            /* historic filesystem type number */
  491         int     vfc_refcount;           /* number mounted of this type */
  492         int     vfc_flags;              /* permanent flags */
  493         struct  vfsconf *vfc_next;      /* next in list */
  494 };
  495 
  496 #ifndef BURN_BRIDGES
  497 struct ovfsconf {
  498         void    *vfc_vfsops;
  499         char    vfc_name[32];
  500         int     vfc_index;
  501         int     vfc_refcount;
  502         int     vfc_flags;
  503 };
  504 #endif
  505 
  506 /*
  507  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  508  * any actual mounts; i.e., it does not make sense to change the flags.
  509  */
  510 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  511 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  512 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  513 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  514 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  515 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode */
  516 #define VFCF_JAIL       0x00400000      /* can be mounted from within a jail */
  517 #define VFCF_DELEGADMIN 0x00800000      /* supports delegated administration */
  518 #define VFCF_SBDRY      0x01000000      /* defer stop requests */
  519 
  520 typedef uint32_t fsctlop_t;
  521 
  522 struct vfsidctl {
  523         int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
  524         fsid_t          vc_fsid;        /* fsid to operate on */
  525         char            vc_fstypename[MFSNAMELEN];
  526                                         /* type of fs 'nfs' or '*' */
  527         fsctlop_t       vc_op;          /* operation VFS_CTL_* (below) */
  528         void            *vc_ptr;        /* pointer to data structure */
  529         size_t          vc_len;         /* sizeof said structure */
  530         u_int32_t       vc_spare[12];   /* spare (must be zero) */
  531 };
  532 
  533 /* vfsidctl API version. */
  534 #define VFS_CTL_VERS1   0x01
  535 
  536 /*
  537  * New style VFS sysctls, do not reuse/conflict with the namespace for
  538  * private sysctls.
  539  * All "global" sysctl ops have the 33rd bit set:
  540  * 0x...1....
  541  * Private sysctl ops should have the 33rd bit unset.
  542  */
  543 #define VFS_CTL_QUERY   0x00010001      /* anything wrong? (vfsquery) */
  544 #define VFS_CTL_TIMEO   0x00010002      /* set timeout for vfs notification */
  545 #define VFS_CTL_NOLOCKS 0x00010003      /* disable file locking */
  546 
  547 struct vfsquery {
  548         u_int32_t       vq_flags;
  549         u_int32_t       vq_spare[31];
  550 };
  551 
  552 /* vfsquery flags */
  553 #define VQ_NOTRESP      0x0001  /* server down */
  554 #define VQ_NEEDAUTH     0x0002  /* server bad auth */
  555 #define VQ_LOWDISK      0x0004  /* we're low on space */
  556 #define VQ_MOUNT        0x0008  /* new filesystem arrived */
  557 #define VQ_UNMOUNT      0x0010  /* filesystem has left */
  558 #define VQ_DEAD         0x0020  /* filesystem is dead, needs force unmount */
  559 #define VQ_ASSIST       0x0040  /* filesystem needs assistance from external
  560                                    program */
  561 #define VQ_NOTRESPLOCK  0x0080  /* server lockd down */
  562 #define VQ_FLAG0100     0x0100  /* placeholder */
  563 #define VQ_FLAG0200     0x0200  /* placeholder */
  564 #define VQ_FLAG0400     0x0400  /* placeholder */
  565 #define VQ_FLAG0800     0x0800  /* placeholder */
  566 #define VQ_FLAG1000     0x1000  /* placeholder */
  567 #define VQ_FLAG2000     0x2000  /* placeholder */
  568 #define VQ_FLAG4000     0x4000  /* placeholder */
  569 #define VQ_FLAG8000     0x8000  /* placeholder */
  570 
  571 #ifdef _KERNEL
  572 /* Point a sysctl request at a vfsidctl's data. */
  573 #define VCTLTOREQ(vc, req)                                              \
  574         do {                                                            \
  575                 (req)->newptr = (vc)->vc_ptr;                           \
  576                 (req)->newlen = (vc)->vc_len;                           \
  577                 (req)->newidx = 0;                                      \
  578         } while (0)
  579 #endif
  580 
  581 struct iovec;
  582 struct uio;
  583 
  584 #ifdef _KERNEL
  585 
  586 /*
  587  * vfs_busy specific flags and mask.
  588  */
  589 #define MBF_NOWAIT      0x01
  590 #define MBF_MNTLSTLOCK  0x02
  591 #define MBF_MASK        (MBF_NOWAIT | MBF_MNTLSTLOCK)
  592 
  593 #ifdef MALLOC_DECLARE
  594 MALLOC_DECLARE(M_MOUNT);
  595 #endif
  596 extern int maxvfsconf;          /* highest defined filesystem type */
  597 
  598 TAILQ_HEAD(vfsconfhead, vfsconf);
  599 extern struct vfsconfhead vfsconf;
  600 
  601 /*
  602  * Operations supported on mounted filesystem.
  603  */
  604 struct mount_args;
  605 struct nameidata;
  606 struct sysctl_req;
  607 struct mntarg;
  608 
  609 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
  610 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
  611 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
  612 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
  613 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
  614 typedef int vfs_sync_t(struct mount *mp, int waitfor);
  615 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  616                     struct vnode **vpp);
  617 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
  618                     int flags, struct vnode **vpp);
  619 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  620                     int *extflagsp, struct ucred **credanonp,
  621                     int *numsecflavors, int **secflavors);
  622 typedef int vfs_init_t(struct vfsconf *);
  623 typedef int vfs_uninit_t(struct vfsconf *);
  624 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  625                     struct vnode *filename_vp, int attrnamespace,
  626                     const char *attrname);
  627 typedef int vfs_mount_t(struct mount *mp);
  628 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
  629                     struct sysctl_req *req);
  630 typedef void vfs_susp_clean_t(struct mount *mp);
  631 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
  632 typedef void vfs_purge_t(struct mount *mp);
  633 
  634 struct vfsops {
  635         vfs_mount_t             *vfs_mount;
  636         vfs_cmount_t            *vfs_cmount;
  637         vfs_unmount_t           *vfs_unmount;
  638         vfs_root_t              *vfs_root;
  639         vfs_quotactl_t          *vfs_quotactl;
  640         vfs_statfs_t            *vfs_statfs;
  641         vfs_sync_t              *vfs_sync;
  642         vfs_vget_t              *vfs_vget;
  643         vfs_fhtovp_t            *vfs_fhtovp;
  644         vfs_checkexp_t          *vfs_checkexp;
  645         vfs_init_t              *vfs_init;
  646         vfs_uninit_t            *vfs_uninit;
  647         vfs_extattrctl_t        *vfs_extattrctl;
  648         vfs_sysctl_t            *vfs_sysctl;
  649         vfs_susp_clean_t        *vfs_susp_clean;
  650         vfs_notify_lowervp_t    *vfs_reclaim_lowervp;
  651         vfs_notify_lowervp_t    *vfs_unlink_lowervp;
  652         vfs_purge_t             *vfs_purge;
  653         vfs_mount_t             *vfs_spare[6];  /* spares for ABI compat */
  654 };
  655 
  656 vfs_statfs_t    __vfs_statfs;
  657 
  658 #define VFS_PROLOGUE(MP)        do {                                    \
  659         struct mount *mp__;                                             \
  660         int _prev_stops;                                                \
  661                                                                         \
  662         mp__ = (MP);                                                    \
  663         _prev_stops = sigdeferstop((mp__ != NULL &&                     \
  664             (mp__->mnt_vfc->vfc_flags & VFCF_SBDRY) != 0) ?             \
  665             SIGDEFERSTOP_SILENT : SIGDEFERSTOP_NOP);
  666 
  667 #define VFS_EPILOGUE(MP)                                                \
  668         sigallowstop(_prev_stops);                                      \
  669 } while (0)
  670 
  671 #define VFS_MOUNT(MP) ({                                                \
  672         int _rc;                                                        \
  673                                                                         \
  674         VFS_PROLOGUE(MP);                                               \
  675         _rc = (*(MP)->mnt_op->vfs_mount)(MP);                           \
  676         VFS_EPILOGUE(MP);                                               \
  677         _rc; })
  678 
  679 #define VFS_UNMOUNT(MP, FORCE) ({                                       \
  680         int _rc;                                                        \
  681                                                                         \
  682         VFS_PROLOGUE(MP);                                               \
  683         _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE);                  \
  684         VFS_EPILOGUE(MP);                                               \
  685         _rc; })
  686 
  687 #define VFS_ROOT(MP, FLAGS, VPP) ({                                     \
  688         int _rc;                                                        \
  689                                                                         \
  690         VFS_PROLOGUE(MP);                                               \
  691         _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP);                \
  692         VFS_EPILOGUE(MP);                                               \
  693         _rc; })
  694 
  695 #define VFS_QUOTACTL(MP, C, U, A) ({                                    \
  696         int _rc;                                                        \
  697                                                                         \
  698         VFS_PROLOGUE(MP);                                               \
  699         _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A);               \
  700         VFS_EPILOGUE(MP);                                               \
  701         _rc; })
  702 
  703 #define VFS_STATFS(MP, SBP) ({                                          \
  704         int _rc;                                                        \
  705                                                                         \
  706         VFS_PROLOGUE(MP);                                               \
  707         _rc = __vfs_statfs((MP), (SBP));                                \
  708         VFS_EPILOGUE(MP);                                               \
  709         _rc; })
  710 
  711 #define VFS_SYNC(MP, WAIT) ({                                           \
  712         int _rc;                                                        \
  713                                                                         \
  714         VFS_PROLOGUE(MP);                                               \
  715         _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT);                      \
  716         VFS_EPILOGUE(MP);                                               \
  717         _rc; })
  718 
  719 #define VFS_VGET(MP, INO, FLAGS, VPP) ({                                \
  720         int _rc;                                                        \
  721                                                                         \
  722         VFS_PROLOGUE(MP);                                               \
  723         _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP);           \
  724         VFS_EPILOGUE(MP);                                               \
  725         _rc; })
  726 
  727 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({                             \
  728         int _rc;                                                        \
  729                                                                         \
  730         VFS_PROLOGUE(MP);                                               \
  731         _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP);        \
  732         VFS_EPILOGUE(MP);                                               \
  733         _rc; })
  734 
  735 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({              \
  736         int _rc;                                                        \
  737                                                                         \
  738         VFS_PROLOGUE(MP);                                               \
  739         _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
  740             SEC);                                                       \
  741         VFS_EPILOGUE(MP);                                               \
  742         _rc; })
  743 
  744 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({                             \
  745         int _rc;                                                        \
  746                                                                         \
  747         VFS_PROLOGUE(MP);                                               \
  748         _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N);        \
  749         VFS_EPILOGUE(MP);                                               \
  750         _rc; })
  751 
  752 #define VFS_SYSCTL(MP, OP, REQ) ({                                      \
  753         int _rc;                                                        \
  754                                                                         \
  755         VFS_PROLOGUE(MP);                                               \
  756         _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ);                 \
  757         VFS_EPILOGUE(MP);                                               \
  758         _rc; })
  759 
  760 #define VFS_SUSP_CLEAN(MP) do {                                         \
  761         if (*(MP)->mnt_op->vfs_susp_clean != NULL) {                    \
  762                 VFS_PROLOGUE(MP);                                       \
  763                 (*(MP)->mnt_op->vfs_susp_clean)(MP);                    \
  764                 VFS_EPILOGUE(MP);                                       \
  765         }                                                               \
  766 } while (0)
  767 
  768 #define VFS_RECLAIM_LOWERVP(MP, VP) do {                                \
  769         if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) {               \
  770                 VFS_PROLOGUE(MP);                                       \
  771                 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP));       \
  772                 VFS_EPILOGUE(MP);                                       \
  773         }                                                               \
  774 } while (0)
  775 
  776 #define VFS_UNLINK_LOWERVP(MP, VP) do {                                 \
  777         if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) {                \
  778                 VFS_PROLOGUE(MP);                                       \
  779                 (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP));        \
  780                 VFS_EPILOGUE(MP);                                       \
  781         }                                                               \
  782 } while (0)
  783 
  784 #define VFS_PURGE(MP) do {                                              \
  785         if (*(MP)->mnt_op->vfs_purge != NULL) {                         \
  786                 VFS_PROLOGUE(MP);                                       \
  787                 (*(MP)->mnt_op->vfs_purge)(MP);                         \
  788                 VFS_EPILOGUE(MP);                                       \
  789         }                                                               \
  790 } while (0)
  791 
  792 #define VFS_KNOTE_LOCKED(vp, hint) do                                   \
  793 {                                                                       \
  794         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  795                 VN_KNOTE((vp), (hint), KNF_LISTLOCKED);                 \
  796 } while (0)
  797 
  798 #define VFS_KNOTE_UNLOCKED(vp, hint) do                                 \
  799 {                                                                       \
  800         if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
  801                 VN_KNOTE((vp), (hint), 0);                              \
  802 } while (0)
  803 
  804 #define VFS_NOTIFY_UPPER_RECLAIM        1
  805 #define VFS_NOTIFY_UPPER_UNLINK         2
  806 
  807 #include <sys/module.h>
  808 
  809 /*
  810  * Version numbers.
  811  */
  812 #define VFS_VERSION_00  0x19660120
  813 #define VFS_VERSION_01  0x20121030
  814 #define VFS_VERSION     VFS_VERSION_01
  815 
  816 #define VFS_SET(vfsops, fsname, flags) \
  817         static struct vfsconf fsname ## _vfsconf = {            \
  818                 .vfc_version = VFS_VERSION,                     \
  819                 .vfc_name = #fsname,                            \
  820                 .vfc_vfsops = &vfsops,                          \
  821                 .vfc_typenum = -1,                              \
  822                 .vfc_flags = flags,                             \
  823         };                                                      \
  824         static moduledata_t fsname ## _mod = {                  \
  825                 #fsname,                                        \
  826                 vfs_modevent,                                   \
  827                 & fsname ## _vfsconf                            \
  828         };                                                      \
  829         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  830 
  831 /*
  832  * exported vnode operations
  833  */
  834 
  835 int     dounmount(struct mount *, int, struct thread *);
  836 
  837 int     kernel_mount(struct mntarg *ma, uint64_t flags);
  838 int     kernel_vmount(int flags, ...);
  839 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
  840 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
  841 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
  842 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
  843 void    statfs_scale_blocks(struct statfs *sf, long max_size);
  844 struct vfsconf *vfs_byname(const char *);
  845 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
  846 void    vfs_mount_destroy(struct mount *);
  847 void    vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
  848 void    vfs_freeopts(struct vfsoptlist *opts);
  849 void    vfs_deleteopt(struct vfsoptlist *opts, const char *name);
  850 int     vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
  851 int     vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
  852             uint64_t val);
  853 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  854 int     vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
  855 int     vfs_getopt_size(struct vfsoptlist *opts, const char *name,
  856             off_t *value);
  857 char    *vfs_getopts(struct vfsoptlist *, const char *, int *error);
  858 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  859 int     vfs_filteropt(struct vfsoptlist *, const char **legal);
  860 void    vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
  861 int     vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
  862 int     vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
  863             int len);
  864 int     vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
  865             int len);
  866 int     vfs_setopts(struct vfsoptlist *opts, const char *name,
  867             const char *value);
  868 int     vfs_setpublicfs                     /* set publicly exported fs */
  869             (struct mount *, struct netexport *, struct export_args *);
  870 void    vfs_msync(struct mount *, int);
  871 int     vfs_busy(struct mount *, int);
  872 int     vfs_export                       /* process mount export info */
  873             (struct mount *, struct export_args *);
  874 void    vfs_allocate_syncvnode(struct mount *);
  875 void    vfs_deallocate_syncvnode(struct mount *);
  876 int     vfs_donmount(struct thread *td, uint64_t fsflags,
  877             struct uio *fsoptions);
  878 void    vfs_getnewfsid(struct mount *);
  879 struct cdev *vfs_getrootfsid(struct mount *);
  880 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  881 struct  mount *vfs_busyfs(fsid_t *);
  882 int     vfs_modevent(module_t, int, void *);
  883 void    vfs_mount_error(struct mount *, const char *, ...);
  884 void    vfs_mountroot(void);                    /* mount our root filesystem */
  885 void    vfs_mountedfrom(struct mount *, const char *from);
  886 void    vfs_notify_upper(struct vnode *, int);
  887 void    vfs_oexport_conv(const struct oexport_args *oexp,
  888             struct export_args *exp);
  889 void    vfs_ref(struct mount *);
  890 void    vfs_rel(struct mount *);
  891 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
  892             struct ucred *);
  893 int     vfs_suser(struct mount *, struct thread *);
  894 void    vfs_unbusy(struct mount *);
  895 void    vfs_unmountall(void);
  896 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  897 extern  struct mtx mountlist_mtx;
  898 extern  struct nfs_public nfs_pub;
  899 extern  struct sx vfsconf_sx;
  900 #define vfsconf_lock()          sx_xlock(&vfsconf_sx)
  901 #define vfsconf_unlock()        sx_xunlock(&vfsconf_sx)
  902 #define vfsconf_slock()         sx_slock(&vfsconf_sx)
  903 #define vfsconf_sunlock()       sx_sunlock(&vfsconf_sx)
  904 
  905 /*
  906  * Declarations for these vfs default operations are located in
  907  * kern/vfs_default.c.  They will be automatically used to replace
  908  * null entries in VFS ops tables when registering a new filesystem
  909  * type in the global table.
  910  */
  911 vfs_root_t              vfs_stdroot;
  912 vfs_quotactl_t          vfs_stdquotactl;
  913 vfs_statfs_t            vfs_stdstatfs;
  914 vfs_sync_t              vfs_stdsync;
  915 vfs_sync_t              vfs_stdnosync;
  916 vfs_vget_t              vfs_stdvget;
  917 vfs_fhtovp_t            vfs_stdfhtovp;
  918 vfs_checkexp_t          vfs_stdcheckexp;
  919 vfs_init_t              vfs_stdinit;
  920 vfs_uninit_t            vfs_stduninit;
  921 vfs_extattrctl_t        vfs_stdextattrctl;
  922 vfs_sysctl_t            vfs_stdsysctl;
  923 
  924 void    syncer_suspend(void);
  925 void    syncer_resume(void);
  926 
  927 #else /* !_KERNEL */
  928 
  929 #include <sys/cdefs.h>
  930 
  931 struct stat;
  932 
  933 __BEGIN_DECLS
  934 int     fhopen(const struct fhandle *, int);
  935 int     fhstat(const struct fhandle *, struct stat *);
  936 int     fhstatfs(const struct fhandle *, struct statfs *);
  937 int     fstatfs(int, struct statfs *);
  938 int     getfh(const char *, fhandle_t *);
  939 int     getfsstat(struct statfs *, long, int);
  940 int     getmntinfo(struct statfs **, int);
  941 int     lgetfh(const char *, fhandle_t *);
  942 int     mount(const char *, const char *, int, void *);
  943 int     nmount(struct iovec *, unsigned int, int);
  944 int     statfs(const char *, struct statfs *);
  945 int     unmount(const char *, int);
  946 
  947 /* C library stuff */
  948 int     getvfsbyname(const char *, struct xvfsconf *);
  949 __END_DECLS
  950 
  951 #endif /* _KERNEL */
  952 
  953 #endif /* !_SYS_MOUNT_H_ */

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