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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1989, 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)mount.h     8.21 (Berkeley) 5/20/95
   32  * $FreeBSD: head/sys/sys/mount.h 341689 2018-12-07 15:17:29Z kib $
   33  */
   34 
   35 #ifndef _SYS_MOUNT_H_
   36 #define _SYS_MOUNT_H_
   37 
   38 #include <sys/ucred.h>
   39 #include <sys/queue.h>
   40 #ifdef _KERNEL
   41 #include <sys/lock.h>
   42 #include <sys/lockmgr.h>
   43 #include <sys/tslog.h>
   44 #include <sys/_mutex.h>
   45 #include <sys/_sx.h>
   46 #endif
   47 
   48 /*
   49  * NOTE: When changing statfs structure, mount structure, MNT_* flags or
   50  * MNTK_* flags also update DDB show mount command in vfs_subr.c.
   51  */
   52 
   53 typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
   54 
   55 /*
   56  * File identifier.
   57  * These are unique per filesystem on a single machine.
   58  */
   59 #define MAXFIDSZ        16
   60 
   61 struct fid {
   62         u_short         fid_len;                /* length of data in bytes */
   63         u_short         fid_data0;              /* force longword alignment */
   64         char            fid_data[MAXFIDSZ];     /* data (variable length) */
   65 };
   66 
   67 /*
   68  * filesystem statistics
   69  */
   70 #define MFSNAMELEN      16              /* length of type name including null */
   71 #define MNAMELEN        1024            /* size of on/from name bufs */
   72 #define STATFS_VERSION  0x20140518      /* current version number */
   73 struct statfs {
   74         uint32_t f_version;             /* structure version number */
   75         uint32_t f_type;                /* type of filesystem */
   76         uint64_t f_flags;               /* copy of mount exported flags */
   77         uint64_t f_bsize;               /* filesystem fragment size */
   78         uint64_t f_iosize;              /* optimal transfer block size */
   79         uint64_t f_blocks;              /* total data blocks in filesystem */
   80         uint64_t f_bfree;               /* free blocks in filesystem */
   81         int64_t  f_bavail;              /* free blocks avail to non-superuser */
   82         uint64_t f_files;               /* total file nodes in filesystem */
   83         int64_t  f_ffree;               /* free nodes avail to non-superuser */
   84         uint64_t f_syncwrites;          /* count of sync writes since mount */
   85         uint64_t f_asyncwrites;         /* count of async writes since mount */
   86         uint64_t f_syncreads;           /* count of sync reads since mount */
   87         uint64_t f_asyncreads;          /* count of async reads since mount */
   88         uint64_t f_spare[10];           /* unused spare */
   89         uint32_t f_namemax;             /* maximum filename length */
   90         uid_t     f_owner;              /* user that mounted the filesystem */
   91         fsid_t    f_fsid;               /* filesystem id */
   92         char      f_charspare[80];          /* spare string space */
   93         char      f_fstypename[MFSNAMELEN]; /* filesystem type name */
   94         char      f_mntfromname[MNAMELEN];  /* mounted filesystem */
   95         char      f_mntonname[MNAMELEN];    /* directory on which mounted */
   96 };
   97 
   98 #if defined(_WANT_FREEBSD11_STATFS) || defined(_KERNEL)
   99 #define FREEBSD11_STATFS_VERSION        0x20030518 /* current version number */
  100 struct freebsd11_statfs {
  101         uint32_t f_version;             /* structure version number */
  102         uint32_t f_type;                /* type of filesystem */
  103         uint64_t f_flags;               /* copy of mount exported flags */
  104         uint64_t f_bsize;               /* filesystem fragment size */
  105         uint64_t f_iosize;              /* optimal transfer block size */
  106         uint64_t f_blocks;              /* total data blocks in filesystem */
  107         uint64_t f_bfree;               /* free blocks in filesystem */
  108         int64_t  f_bavail;              /* free blocks avail to non-superuser */
  109         uint64_t f_files;               /* total file nodes in filesystem */
  110         int64_t  f_ffree;               /* free nodes avail to non-superuser */
  111         uint64_t f_syncwrites;          /* count of sync writes since mount */
  112         uint64_t f_asyncwrites;         /* count of async writes since mount */
  113         uint64_t f_syncreads;           /* count of sync reads since mount */
  114         uint64_t f_asyncreads;          /* count of async reads since mount */
  115         uint64_t f_spare[10];           /* unused spare */
  116         uint32_t f_namemax;             /* maximum filename length */
  117         uid_t     f_owner;              /* user that mounted the filesystem */
  118         fsid_t    f_fsid;               /* filesystem id */
  119         char      f_charspare[80];      /* spare string space */
  120         char      f_fstypename[16];     /* filesystem type name */
  121         char      f_mntfromname[88];    /* mounted filesystem */
  122         char      f_mntonname[88];      /* directory on which mounted */
  123 };
  124 #endif /* _WANT_FREEBSD11_STATFS || _KERNEL */
  125 
  126 #ifdef _KERNEL
  127 #define OMFSNAMELEN     16      /* length of fs type name, including null */
  128 #define OMNAMELEN       (88 - 2 * sizeof(long)) /* size of on/from name bufs */
  129 
  130 /* XXX getfsstat.2 is out of date with write and read counter changes here. */
  131 /* XXX statfs.2 is out of date with read counter changes here. */
  132 struct ostatfs {
  133         long    f_spare2;               /* placeholder */
  134         long    f_bsize;                /* fundamental filesystem block size */
  135         long    f_iosize;               /* optimal transfer block size */
  136         long    f_blocks;               /* total data blocks in filesystem */
  137         long    f_bfree;                /* free blocks in fs */
  138         long    f_bavail;               /* free blocks avail to non-superuser */
  139         long    f_files;                /* total file nodes in filesystem */
  140         long    f_ffree;                /* free file nodes in fs */
  141         fsid_t  f_fsid;                 /* filesystem id */
  142         uid_t   f_owner;                /* user that mounted the filesystem */
  143         int     f_type;                 /* type of filesystem */
  144         int     f_flags;                /* copy of mount exported flags */
  145         long    f_syncwrites;           /* count of sync writes since mount */
  146         long    f_asyncwrites;          /* count of async writes since mount */
  147         char    f_fstypename[OMFSNAMELEN]; /* fs type name */
  148         char    f_mntonname[OMNAMELEN]; /* directory on which mounted */
  149         long    f_syncreads;            /* count of sync reads since mount */
  150         long    f_asyncreads;           /* count of async reads since mount */
  151         short   f_spares1;              /* unused spare */
  152         char    f_mntfromname[OMNAMELEN];/* mounted filesystem */
  153         short   f_spares2;              /* unused spare */
  154         /*
  155          * XXX on machines where longs are aligned to 8-byte boundaries, there
  156          * is an unnamed int32_t here.  This spare was after the apparent end
  157          * of the struct until we bit off the read counters from f_mntonname.
  158          */
  159         long    f_spare[2];             /* unused spare */
  160 };
  161 
  162 TAILQ_HEAD(vnodelst, vnode);
  163 
  164 /* Mount options list */
  165 TAILQ_HEAD(vfsoptlist, vfsopt);
  166 struct vfsopt {
  167         TAILQ_ENTRY(vfsopt) link;
  168         char    *name;
  169         void    *value;
  170         int     len;
  171         int     pos;
  172         int     seen;
  173 };
  174 
  175 /*
  176  * Structure per mounted filesystem.  Each mounted filesystem has an
  177  * array of operations and an instance record.  The filesystems are
  178  * put on a doubly linked list.
  179  *
  180  * Lock reference:
  181  *      l - mnt_listmtx
  182  *      m - mountlist_mtx
  183  *      i - interlock
  184  *      v - vnode freelist mutex
  185  *
  186  * Unmarked fields are considered stable as long as a ref is held.
  187  *
  188  */
  189 struct mount {
  190         struct mtx      mnt_mtx;                /* mount structure interlock */
  191         int             mnt_gen;                /* struct mount generation */
  192 #define mnt_startzero   mnt_list
  193         TAILQ_ENTRY(mount) mnt_list;            /* (m) mount list */
  194         struct vfsops   *mnt_op;                /* operations on fs */
  195         struct vfsconf  *mnt_vfc;               /* configuration info */
  196         struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
  197         struct vnode    *mnt_syncer;            /* syncer vnode */
  198         int             mnt_ref;                /* (i) Reference count */
  199         struct vnodelst mnt_nvnodelist;         /* (i) list of vnodes */
  200         int             mnt_nvnodelistsize;     /* (i) # of vnodes */
  201         int             mnt_writeopcount;       /* (i) write syscalls pending */
  202         int             mnt_kern_flag;          /* (i) kernel only flags */
  203         uint64_t        mnt_flag;               /* (i) flags shared with user */
  204         struct vfsoptlist *mnt_opt;             /* current mount options */
  205         struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
  206         int             mnt_maxsymlinklen;      /* max size of short symlink */
  207         struct statfs   mnt_stat;               /* cache of filesystem stats */
  208         struct ucred    *mnt_cred;              /* credentials of mounter */
  209         void *          mnt_data;               /* private data */
  210         time_t          mnt_time;               /* last time written*/
  211         int             mnt_iosize_max;         /* max size for clusters, etc */
  212         struct netexport *mnt_export;           /* export list */
  213         struct label    *mnt_label;             /* MAC label for the fs */
  214         u_int           mnt_hashseed;           /* Random seed for vfs_hash */
  215         int             mnt_lockref;            /* (i) Lock reference count */
  216         int             mnt_secondary_writes;   /* (i) # of secondary writes */
  217         int             mnt_secondary_accwrites;/* (i) secondary wr. starts */
  218         struct thread   *mnt_susp_owner;        /* (i) thread owning suspension */
  219 #define mnt_endzero     mnt_gjprovider
  220         char            *mnt_gjprovider;        /* gjournal provider name */
  221         struct mtx      mnt_listmtx;
  222         struct vnodelst mnt_activevnodelist;    /* (l) list of active vnodes */
  223         int             mnt_activevnodelistsize;/* (l) # of active vnodes */
  224         struct vnodelst mnt_tmpfreevnodelist;   /* (l) list of free vnodes */
  225         int             mnt_tmpfreevnodelistsize;/* (l) # of free vnodes */
  226         struct lock     mnt_explock;            /* vfs_export walkers lock */
  227         TAILQ_ENTRY(mount) mnt_upper_link;      /* (m) we in the all uppers */
  228         TAILQ_HEAD(, mount) mnt_uppers;         /* (m) upper mounts over us*/
  229 };
  230 
  231 /*
  232  * Definitions for MNT_VNODE_FOREACH_ALL.
  233  */
  234 struct vnode *__mnt_vnode_next_all(struct vnode **mvp, struct mount *mp);
  235 struct vnode *__mnt_vnode_first_all(struct vnode **mvp, struct mount *mp);
  236 void          __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp);
  237 
  238 #define MNT_VNODE_FOREACH_ALL(vp, mp, mvp)                              \
  239         for (vp = __mnt_vnode_first_all(&(mvp), (mp));                  \
  240                 (vp) != NULL; vp = __mnt_vnode_next_all(&(mvp), (mp)))
  241 
  242 #define MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp)                            \
  243         do {                                                            \
  244                 MNT_ILOCK(mp);                                          \
  245                 __mnt_vnode_markerfree_all(&(mvp), (mp));               \
  246                 /* MNT_IUNLOCK(mp); -- done in above function */        \
  247                 mtx_assert(MNT_MTX(mp), MA_NOTOWNED);                   \
  248         } while (0)
  249 
  250 /*
  251  * Definitions for MNT_VNODE_FOREACH_ACTIVE.
  252  */
  253 struct vnode *__mnt_vnode_next_active(struct vnode **mvp, struct mount *mp);
  254 struct vnode *__mnt_vnode_first_active(struct vnode **mvp, struct mount *mp);
  255 void          __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
  256 
  257 #define MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp)                           \
  258         for (vp = __mnt_vnode_first_active(&(mvp), (mp));               \
  259                 (vp) != NULL; vp = __mnt_vnode_next_active(&(mvp), (mp)))
  260 
  261 #define MNT_VNODE_FOREACH_ACTIVE_ABORT(mp, mvp)                         \
  262         __mnt_vnode_markerfree_active(&(mvp), (mp))
  263 
  264 #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
  265 #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
  266 #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
  267 #define MNT_MTX(mp)     (&(mp)->mnt_mtx)
  268 #define MNT_REF(mp)     (mp)->mnt_ref++
  269 #define MNT_REL(mp)     do {                                            \
  270         KASSERT((mp)->mnt_ref > 0, ("negative mnt_ref"));               \
  271         (mp)->mnt_ref--;                                                \
  272         if ((mp)->mnt_ref == 0)                                         \
  273                 wakeup((mp));                                           \
  274 } while (0)
  275 
  276 #endif /* _KERNEL */
  277 
  278 /*
  279  * User specifiable flags, stored in mnt_flag.
  280  */
  281 #define MNT_RDONLY      0x0000000000000001ULL /* read only filesystem */
  282 #define MNT_SYNCHRONOUS 0x0000000000000002ULL /* fs written synchronously */
  283 #define MNT_NOEXEC      0x0000000000000004ULL /* can't exec from filesystem */
  284 #define MNT_NOSUID      0x0000000000000008ULL /* don't honor setuid fs bits */
  285 #define MNT_NFS4ACLS    0x0000000000000010ULL /* enable NFS version 4 ACLs */
  286 #define MNT_UNION       0x0000000000000020ULL /* union with underlying fs */
  287 #define MNT_ASYNC       0x0000000000000040ULL /* fs written asynchronously */
  288 #define MNT_SUIDDIR     0x0000000000100000ULL /* special SUID dir handling */
  289 #define MNT_SOFTDEP     0x0000000000200000ULL /* using soft updates */
  290 #define MNT_NOSYMFOLLOW 0x0000000000400000ULL /* do not follow symlinks */
  291 #define MNT_GJOURNAL    0x0000000002000000ULL /* GEOM journal support enabled */
  292 #define MNT_MULTILABEL  0x0000000004000000ULL /* MAC support for objects */
  293 #define MNT_ACLS        0x0000000008000000ULL /* ACL support enabled */
  294 #define MNT_NOATIME     0x0000000010000000ULL /* dont update file access time */
  295 #define MNT_NOCLUSTERR  0x0000000040000000ULL /* disable cluster read */
  296 #define MNT_NOCLUSTERW  0x0000000080000000ULL /* disable cluster write */
  297 #define MNT_SUJ         0x0000000100000000ULL /* using journaled soft updates */
  298 #define MNT_AUTOMOUNTED 0x0000000200000000ULL /* mounted by automountd(8) */
  299 
  300 /*
  301  * NFS export related mount flags.
  302  */
  303 #define MNT_EXRDONLY    0x0000000000000080ULL   /* exported read only */
  304 #define MNT_EXPORTED    0x0000000000000100ULL   /* filesystem is exported */
  305 #define MNT_DEFEXPORTED 0x0000000000000200ULL   /* exported to the world */
  306 #define MNT_EXPORTANON  0x0000000000000400ULL   /* anon uid mapping for all */
  307 #define MNT_EXKERB      0x0000000000000800ULL   /* exported with Kerberos */
  308 #define MNT_EXPUBLIC    0x0000000020000000ULL   /* public export (WebNFS) */
  309 
  310 /*
  311  * Flags set by internal operations,
  312  * but visible to the user.
  313  * XXX some of these are not quite right.. (I've never seen the root flag set)
  314  */
  315 #define MNT_LOCAL       0x0000000000001000ULL /* filesystem is stored locally */
  316 #define MNT_QUOTA       0x0000000000002000ULL /* quotas are enabled on fs */
  317 #define MNT_ROOTFS      0x0000000000004000ULL /* identifies the root fs */
  318 #define MNT_USER        0x0000000000008000ULL /* mounted by a user */
  319 #define MNT_IGNORE      0x0000000000800000ULL /* do not show entry in df */
  320 #define MNT_VERIFIED    0x0000000400000000ULL /* filesystem is verified */
  321 
  322 /*
  323  * Mask of flags that are visible to statfs().
  324  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  325  * but the 'mount' program may need changing to handle this.
  326  */
  327 #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
  328                         MNT_NOSUID      | MNT_UNION     | MNT_SUJ       | \
  329                         MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
  330                         MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
  331                         MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
  332                         MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
  333                         MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
  334                         MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
  335                         MNT_GJOURNAL    | MNT_MULTILABEL | MNT_ACLS     | \
  336                         MNT_NFS4ACLS    | MNT_AUTOMOUNTED | MNT_VERIFIED)
  337 
  338 /* Mask of flags that can be updated. */
  339 #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | \
  340                         MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
  341                         MNT_NOATIME | \
  342                         MNT_NOSYMFOLLOW | MNT_IGNORE    | \
  343                         MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
  344                         MNT_ACLS        | MNT_USER      | MNT_NFS4ACLS  | \
  345                         MNT_AUTOMOUNTED)
  346 
  347 /*
  348  * External filesystem command modifier flags.
  349  * Unmount can use the MNT_FORCE flag.
  350  * XXX: These are not STATES and really should be somewhere else.
  351  * XXX: MNT_BYFSID and MNT_NONBUSY collide with MNT_ACLS and MNT_MULTILABEL,
  352  *      but because MNT_ACLS and MNT_MULTILABEL are only used for mount(2),
  353  *      and MNT_BYFSID and MNT_NONBUSY are only used for unmount(2),
  354  *      it's harmless.
  355  */
  356 #define MNT_UPDATE      0x0000000000010000ULL /* not real mount, just update */
  357 #define MNT_DELEXPORT   0x0000000000020000ULL /* delete export host lists */
  358 #define MNT_RELOAD      0x0000000000040000ULL /* reload filesystem data */
  359 #define MNT_FORCE       0x0000000000080000ULL /* force unmount or readonly */
  360 #define MNT_SNAPSHOT    0x0000000001000000ULL /* snapshot the filesystem */
  361 #define MNT_NONBUSY     0x0000000004000000ULL /* check vnode use counts. */
  362 #define MNT_BYFSID      0x0000000008000000ULL /* specify filesystem by ID. */
  363 #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
  364                         MNT_FORCE       | MNT_SNAPSHOT  | MNT_NONBUSY   | \
  365                         MNT_BYFSID)
  366 /*
  367  * Internal filesystem control flags stored in mnt_kern_flag.
  368  *
  369  * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
  370  * past the mount point.  This keeps the subtree stable during mounts
  371  * and unmounts.
  372  *
  373  * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
  374  * dounmount() is still waiting to lock the mountpoint. This allows
  375  * the filesystem to cancel operations that might otherwise deadlock
  376  * with the unmount attempt (used by NFS).
  377  *
  378  * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
  379  * to allow for failed unmount attempt to restore the syncer vnode for
  380  * the mount.
  381  */
  382 #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
  383 #define MNTK_ASYNC      0x00000002      /* filtered async flag */
  384 #define MNTK_SOFTDEP    0x00000004      /* async disabled by softdep */
  385 #define MNTK_NOINSMNTQ  0x00000008      /* insmntque is not allowed */
  386 #define MNTK_DRAINING   0x00000010      /* lock draining is happening */
  387 #define MNTK_REFEXPIRE  0x00000020      /* refcount expiring is happening */
  388 #define MNTK_EXTENDED_SHARED    0x00000040 /* Allow shared locking for more ops */
  389 #define MNTK_SHARED_WRITES      0x00000080 /* Allow shared locking for writes */
  390 #define MNTK_NO_IOPF    0x00000100      /* Disallow page faults during reads
  391                                            and writes. Filesystem shall properly
  392                                            handle i/o state on EFAULT. */
  393 #define MNTK_VGONE_UPPER        0x00000200
  394 #define MNTK_VGONE_WAITER       0x00000400
  395 #define MNTK_LOOKUP_EXCL_DOTDOT 0x00000800
  396 #define MNTK_MARKER             0x00001000
  397 #define MNTK_UNMAPPED_BUFS      0x00002000
  398 #define MNTK_USES_BCACHE        0x00004000 /* FS uses the buffer cache. */
  399 #define MNTK_NOASYNC    0x00800000      /* disable async */
  400 #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
  401 #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
  402 #define MNTK_SUSPEND    0x08000000      /* request write suspension */
  403 #define MNTK_SUSPEND2   0x04000000      /* block secondary writes */
  404 #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
  405 #define MNTK_NULL_NOCACHE       0x20000000 /* auto disable cache for nullfs
  406                                               mounts over this fs */
  407 #define MNTK_LOOKUP_SHARED      0x40000000 /* FS supports shared lock lookups */
  408 #define MNTK_NOKNOTE    0x80000000      /* Don't send KNOTEs from VOP hooks */
  409 
  410 #ifdef _KERNEL
  411 static inline int
  412 MNT_SHARED_WRITES(struct mount *mp)
  413 {
  414 
  415         return (mp != NULL && (mp->mnt_kern_flag & MNTK_SHARED_WRITES) != 0);
  416 }
  417 
  418 static inline int
  419 MNT_EXTENDED_SHARED(struct mount *mp)
  420 {
  421 
  422         return (mp != NULL && (mp->mnt_kern_flag & MNTK_EXTENDED_SHARED) != 0);
  423 }
  424 #endif
  425 
  426 /*
  427  * Sysctl CTL_VFS definitions.
  428  *
  429  * Second level identifier specifies which filesystem. Second level
  430  * identifier VFS_VFSCONF returns information about all filesystems.
  431  * Second level identifier VFS_GENERIC is non-terminal.
  432  */
  433 #define VFS_VFSCONF             0       /* get configured filesystems */
  434 #define VFS_GENERIC             0       /* generic filesystem information */
  435 /*
  436  * Third level identifiers for VFS_GENERIC are given below; third
  437  * level identifiers for specific filesystems are given in their
  438  * mount specific header files.
  439  */
  440 #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
  441 #define VFS_CONF        2       /* struct: vfsconf for filesystem given
  442                                    as next argument */
  443 
  444 /*
  445  * Flags for various system call interfaces.
  446  *
  447  * waitfor flags to vfs_sync() and getfsstat()
  448  */
  449 #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
  450 #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
  451 #define MNT_LAZY        3       /* push data not written by filesystem syncer */
  452 #define MNT_SUSPEND     4       /* Suspend file system after sync */
  453 
  454 /*
  455  * Generic file handle
  456  */
  457 struct fhandle {
  458         fsid_t  fh_fsid;        /* Filesystem id of mount point */
  459         struct  fid fh_fid;     /* Filesys specific id */
  460 };
  461 typedef struct fhandle  fhandle_t;
  462 
  463 /*
  464  * Old export arguments without security flavor list
  465  */
  466 struct oexport_args {
  467         int     ex_flags;               /* export related flags */
  468         uid_t   ex_root;                /* mapping for root uid */
  469         struct  xucred ex_anon;         /* mapping for anonymous user */
  470         struct  sockaddr *ex_addr;      /* net address to which exported */
  471         u_char  ex_addrlen;             /* and the net address length */
  472         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  473         u_char  ex_masklen;             /* and the smask length */
  474         char    *ex_indexfile;          /* index file for WebNFS URLs */
  475 };
  476 
  477 /*
  478  * Export arguments for local filesystem mount calls.
  479  */
  480 #define MAXSECFLAVORS   5
  481 struct export_args {
  482         int     ex_flags;               /* export related flags */
  483         uid_t   ex_root;                /* mapping for root uid */
  484         struct  xucred ex_anon;         /* mapping for anonymous user */
  485         struct  sockaddr *ex_addr;      /* net address to which exported */
  486         u_char  ex_addrlen;             /* and the net address length */
  487         struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
  488         u_char  ex_masklen;             /* and the smask length */
  489         char    *ex_indexfile;          /* index file for WebNFS URLs */
  490         int     ex_numsecflavors;       /* security flavor count */
  491         int     ex_secflavors[MAXSECFLAVORS]; /* list of security flavors */
  492 };
  493 
  494 /*
  495  * Structure holding information for a publicly exported filesystem
  496  * (WebNFS). Currently the specs allow just for one such filesystem.
  497  */
  498 struct nfs_public {
  499         int             np_valid;       /* Do we hold valid information */
  500         fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
  501         struct mount    *np_mount;      /* Mountpoint of exported fs */
  502         char            *np_index;      /* Index file */
  503 };
  504 
  505 /*
  506  * Filesystem configuration information. One of these exists for each
  507  * type of filesystem supported by the kernel. These are searched at
  508  * mount time to identify the requested filesystem.
  509  *
  510  * XXX: Never change the first two arguments!
  511  */
  512 struct vfsconf {
  513         u_int   vfc_version;            /* ABI version number */
  514         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  515         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  516         struct  vfsops *vfc_vfsops_sd;  /* ... signal-deferred */
  517         int     vfc_typenum;            /* historic filesystem type number */
  518         int     vfc_refcount;           /* number mounted of this type */
  519         int     vfc_flags;              /* permanent flags */
  520         int     vfc_prison_flag;        /* prison allow.mount.* flag */
  521         struct  vfsoptdecl *vfc_opts;   /* mount options */
  522         TAILQ_ENTRY(vfsconf) vfc_list;  /* list of vfscons */
  523 };
  524 
  525 /* Userland version of the struct vfsconf. */
  526 struct xvfsconf {
  527         struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
  528         char    vfc_name[MFSNAMELEN];   /* filesystem type name */
  529         int     vfc_typenum;            /* historic filesystem type number */
  530         int     vfc_refcount;           /* number mounted of this type */
  531         int     vfc_flags;              /* permanent flags */
  532         struct  vfsconf *vfc_next;      /* next in list */
  533 };
  534 
  535 #ifndef BURN_BRIDGES
  536 struct ovfsconf {
  537         void    *vfc_vfsops;
  538         char    vfc_name[32];
  539         int     vfc_index;
  540         int     vfc_refcount;
  541         int     vfc_flags;
  542 };
  543 #endif
  544 
  545 /*
  546  * NB: these flags refer to IMPLEMENTATION properties, not properties of
  547  * any actual mounts; i.e., it does not make sense to change the flags.
  548  */
  549 #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
  550 #define VFCF_NETWORK    0x00020000      /* may get data over the network */
  551 #define VFCF_READONLY   0x00040000      /* writes are not implemented */
  552 #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
  553 #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
  554 #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode */
  555 #define VFCF_JAIL       0x00400000      /* can be mounted from within a jail */
  556 #define VFCF_DELEGADMIN 0x00800000      /* supports delegated administration */
  557 #define VFCF_SBDRY      0x01000000      /* Stop at Boundary: defer stop requests
  558                                            to kernel->user (AST) transition */
  559 
  560 typedef uint32_t fsctlop_t;
  561 
  562 struct vfsidctl {
  563         int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
  564         fsid_t          vc_fsid;        /* fsid to operate on */
  565         char            vc_fstypename[MFSNAMELEN];
  566                                         /* type of fs 'nfs' or '*' */
  567         fsctlop_t       vc_op;          /* operation VFS_CTL_* (below) */
  568         void            *vc_ptr;        /* pointer to data structure */
  569         size_t          vc_len;         /* sizeof said structure */
  570         u_int32_t       vc_spare[12];   /* spare (must be zero) */
  571 };
  572 
  573 /* vfsidctl API version. */
  574 #define VFS_CTL_VERS1   0x01
  575 
  576 /*
  577  * New style VFS sysctls, do not reuse/conflict with the namespace for
  578  * private sysctls.
  579  * All "global" sysctl ops have the 33rd bit set:
  580  * 0x...1....
  581  * Private sysctl ops should have the 33rd bit unset.
  582  */
  583 #define VFS_CTL_QUERY   0x00010001      /* anything wrong? (vfsquery) */
  584 #define VFS_CTL_TIMEO   0x00010002      /* set timeout for vfs notification */
  585 #define VFS_CTL_NOLOCKS 0x00010003      /* disable file locking */
  586 
  587 struct vfsquery {
  588         u_int32_t       vq_flags;
  589         u_int32_t       vq_spare[31];
  590 };
  591 
  592 /* vfsquery flags */
  593 #define VQ_NOTRESP      0x0001  /* server down */
  594 #define VQ_NEEDAUTH     0x0002  /* server bad auth */
  595 #define VQ_LOWDISK      0x0004  /* we're low on space */
  596 #define VQ_MOUNT        0x0008  /* new filesystem arrived */
  597 #define VQ_UNMOUNT      0x0010  /* filesystem has left */
  598 #define VQ_DEAD         0x0020  /* filesystem is dead, needs force unmount */
  599 #define VQ_ASSIST       0x0040  /* filesystem needs assistance from external
  600                                    program */
  601 #define VQ_NOTRESPLOCK  0x0080  /* server lockd down */
  602 #define VQ_FLAG0100     0x0100  /* placeholder */
  603 #define VQ_FLAG0200     0x0200  /* placeholder */
  604 #define VQ_FLAG0400     0x0400  /* placeholder */
  605 #define VQ_FLAG0800     0x0800  /* placeholder */
  606 #define VQ_FLAG1000     0x1000  /* placeholder */
  607 #define VQ_FLAG2000     0x2000  /* placeholder */
  608 #define VQ_FLAG4000     0x4000  /* placeholder */
  609 #define VQ_FLAG8000     0x8000  /* placeholder */
  610 
  611 #ifdef _KERNEL
  612 /* Point a sysctl request at a vfsidctl's data. */
  613 #define VCTLTOREQ(vc, req)                                              \
  614         do {                                                            \
  615                 (req)->newptr = (vc)->vc_ptr;                           \
  616                 (req)->newlen = (vc)->vc_len;                           \
  617                 (req)->newidx = 0;                                      \
  618         } while (0)
  619 #endif
  620 
  621 struct iovec;
  622 struct uio;
  623 
  624 #ifdef _KERNEL
  625 
  626 /*
  627  * vfs_busy specific flags and mask.
  628  */
  629 #define MBF_NOWAIT      0x01
  630 #define MBF_MNTLSTLOCK  0x02
  631 #define MBF_MASK        (MBF_NOWAIT | MBF_MNTLSTLOCK)
  632 
  633 #ifdef MALLOC_DECLARE
  634 MALLOC_DECLARE(M_MOUNT);
  635 MALLOC_DECLARE(M_STATFS);
  636 #endif
  637 extern int maxvfsconf;          /* highest defined filesystem type */
  638 
  639 TAILQ_HEAD(vfsconfhead, vfsconf);
  640 extern struct vfsconfhead vfsconf;
  641 
  642 /*
  643  * Operations supported on mounted filesystem.
  644  */
  645 struct mount_args;
  646 struct nameidata;
  647 struct sysctl_req;
  648 struct mntarg;
  649 
  650 typedef int vfs_cmount_t(struct mntarg *ma, void *data, uint64_t flags);
  651 typedef int vfs_unmount_t(struct mount *mp, int mntflags);
  652 typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp);
  653 typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid, void *arg);
  654 typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp);
  655 typedef int vfs_sync_t(struct mount *mp, int waitfor);
  656 typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
  657                     struct vnode **vpp);
  658 typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp,
  659                     int flags, struct vnode **vpp);
  660 typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
  661                     int *extflagsp, struct ucred **credanonp,
  662                     int *numsecflavors, int **secflavors);
  663 typedef int vfs_init_t(struct vfsconf *);
  664 typedef int vfs_uninit_t(struct vfsconf *);
  665 typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
  666                     struct vnode *filename_vp, int attrnamespace,
  667                     const char *attrname);
  668 typedef int vfs_mount_t(struct mount *mp);
  669 typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
  670                     struct sysctl_req *req);
  671 typedef void vfs_susp_clean_t(struct mount *mp);
  672 typedef void vfs_notify_lowervp_t(struct mount *mp, struct vnode *lowervp);
  673 typedef void vfs_purge_t(struct mount *mp);
  674 
  675 struct vfsops {
  676         vfs_mount_t             *vfs_mount;
  677         vfs_cmount_t            *vfs_cmount;
  678         vfs_unmount_t           *vfs_unmount;
  679         vfs_root_t              *vfs_root;
  680         vfs_quotactl_t          *vfs_quotactl;
  681         vfs_statfs_t            *vfs_statfs;
  682         vfs_sync_t              *vfs_sync;
  683         vfs_vget_t              *vfs_vget;
  684         vfs_fhtovp_t            *vfs_fhtovp;
  685         vfs_checkexp_t          *vfs_checkexp;
  686         vfs_init_t              *vfs_init;
  687         vfs_uninit_t            *vfs_uninit;
  688         vfs_extattrctl_t        *vfs_extattrctl;
  689         vfs_sysctl_t            *vfs_sysctl;
  690         vfs_susp_clean_t        *vfs_susp_clean;
  691         vfs_notify_lowervp_t    *vfs_reclaim_lowervp;
  692         vfs_notify_lowervp_t    *vfs_unlink_lowervp;
  693         vfs_purge_t             *vfs_purge;
  694         vfs_mount_t             *vfs_spare[6];  /* spares for ABI compat */
  695 };
  696 
  697 vfs_statfs_t    __vfs_statfs;
  698 
  699 #define VFS_MOUNT(MP) ({                                                \
  700         int _rc;                                                        \
  701                                                                         \
  702         TSRAW(curthread, TS_ENTER, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\
  703         _rc = (*(MP)->mnt_op->vfs_mount)(MP);                           \
  704         TSRAW(curthread, TS_EXIT, "VFS_MOUNT", (MP)->mnt_vfc->vfc_name);\
  705         _rc; })
  706 
  707 #define VFS_UNMOUNT(MP, FORCE) ({                                       \
  708         int _rc;                                                        \
  709                                                                         \
  710         _rc = (*(MP)->mnt_op->vfs_unmount)(MP, FORCE);                  \
  711         _rc; })
  712 
  713 #define VFS_ROOT(MP, FLAGS, VPP) ({                                     \
  714         int _rc;                                                        \
  715                                                                         \
  716         _rc = (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP);                \
  717         _rc; })
  718 
  719 #define VFS_QUOTACTL(MP, C, U, A) ({                                    \
  720         int _rc;                                                        \
  721                                                                         \
  722         _rc = (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A);               \
  723         _rc; })
  724 
  725 #define VFS_STATFS(MP, SBP) ({                                          \
  726         int _rc;                                                        \
  727                                                                         \
  728         _rc = __vfs_statfs((MP), (SBP));                                \
  729         _rc; })
  730 
  731 #define VFS_SYNC(MP, WAIT) ({                                           \
  732         int _rc;                                                        \
  733                                                                         \
  734         _rc = (*(MP)->mnt_op->vfs_sync)(MP, WAIT);                      \
  735         _rc; })
  736 
  737 #define VFS_VGET(MP, INO, FLAGS, VPP) ({                                \
  738         int _rc;                                                        \
  739                                                                         \
  740         _rc = (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP);           \
  741         _rc; })
  742 
  743 #define VFS_FHTOVP(MP, FIDP, FLAGS, VPP) ({                             \
  744         int _rc;                                                        \
  745                                                                         \
  746         _rc = (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, FLAGS, VPP);        \
  747         _rc; })
  748 
  749 #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED, NUMSEC, SEC) ({              \
  750         int _rc;                                                        \
  751                                                                         \
  752         _rc = (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED, NUMSEC,\
  753             SEC);                                                       \
  754         _rc; })
  755 
  756 #define VFS_EXTATTRCTL(MP, C, FN, NS, N) ({                             \
  757         int _rc;                                                        \
  758                                                                         \
  759         _rc = (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N);        \
  760         _rc; })
  761 
  762 #define VFS_SYSCTL(MP, OP, REQ) ({                                      \
  763         int _rc;                                                        \
  764                                                                         \
  765         _rc = (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ);                 \
  766         _rc; })
  767 
  768 #define VFS_SUSP_CLEAN(MP) do {                                         \
  769         if (*(MP)->mnt_op->vfs_susp_clean != NULL) {                    \
  770                 (*(MP)->mnt_op->vfs_susp_clean)(MP);                    \
  771         }                                                               \
  772 } while (0)
  773 
  774 #define VFS_RECLAIM_LOWERVP(MP, VP) do {                                \
  775         if (*(MP)->mnt_op->vfs_reclaim_lowervp != NULL) {               \
  776                 (*(MP)->mnt_op->vfs_reclaim_lowervp)((MP), (VP));       \
  777         }                                                               \
  778 } while (0)
  779 
  780 #define VFS_UNLINK_LOWERVP(MP, VP) do {                                 \
  781         if (*(MP)->mnt_op->vfs_unlink_lowervp != NULL) {                \
  782                 (*(MP)->mnt_op->vfs_unlink_lowervp)((MP), (VP));        \
  783         }                                                               \
  784 } while (0)
  785 
  786 #define VFS_PURGE(MP) do {                                              \
  787         if (*(MP)->mnt_op->vfs_purge != NULL) {                         \
  788                 (*(MP)->mnt_op->vfs_purge)(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_02  0x20180504
  815 #define VFS_VERSION     VFS_VERSION_02
  816 
  817 #define VFS_SET(vfsops, fsname, flags) \
  818         static struct vfsconf fsname ## _vfsconf = {            \
  819                 .vfc_version = VFS_VERSION,                     \
  820                 .vfc_name = #fsname,                            \
  821                 .vfc_vfsops = &vfsops,                          \
  822                 .vfc_typenum = -1,                              \
  823                 .vfc_flags = flags,                             \
  824         };                                                      \
  825         static moduledata_t fsname ## _mod = {                  \
  826                 #fsname,                                        \
  827                 vfs_modevent,                                   \
  828                 & fsname ## _vfsconf                            \
  829         };                                                      \
  830         DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
  831 
  832 /*
  833  * exported vnode operations
  834  */
  835 
  836 int     dounmount(struct mount *, int, struct thread *);
  837 
  838 int     kernel_mount(struct mntarg *ma, uint64_t flags);
  839 int     kernel_vmount(int flags, ...);
  840 struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
  841 struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
  842 struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
  843 struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
  844 void    statfs_scale_blocks(struct statfs *sf, long max_size);
  845 struct vfsconf *vfs_byname(const char *);
  846 struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
  847 void    vfs_mount_destroy(struct mount *);
  848 void    vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
  849 void    vfs_freeopts(struct vfsoptlist *opts);
  850 void    vfs_deleteopt(struct vfsoptlist *opts, const char *name);
  851 int     vfs_buildopts(struct uio *auio, struct vfsoptlist **options);
  852 int     vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
  853             uint64_t val);
  854 int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
  855 int     vfs_getopt_pos(struct vfsoptlist *opts, const char *name);
  856 int     vfs_getopt_size(struct vfsoptlist *opts, const char *name,
  857             off_t *value);
  858 char    *vfs_getopts(struct vfsoptlist *, const char *, int *error);
  859 int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
  860 int     vfs_filteropt(struct vfsoptlist *, const char **legal);
  861 void    vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...);
  862 int     vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
  863 int     vfs_setopt(struct vfsoptlist *opts, const char *name, void *value,
  864             int len);
  865 int     vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value,
  866             int len);
  867 int     vfs_setopts(struct vfsoptlist *opts, const char *name,
  868             const char *value);
  869 int     vfs_setpublicfs                     /* set publicly exported fs */
  870             (struct mount *, struct netexport *, struct export_args *);
  871 void    vfs_msync(struct mount *, int);
  872 int     vfs_busy(struct mount *, int);
  873 int     vfs_export                       /* process mount export info */
  874             (struct mount *, struct export_args *);
  875 void    vfs_allocate_syncvnode(struct mount *);
  876 void    vfs_deallocate_syncvnode(struct mount *);
  877 int     vfs_donmount(struct thread *td, uint64_t fsflags,
  878             struct uio *fsoptions);
  879 void    vfs_getnewfsid(struct mount *);
  880 struct cdev *vfs_getrootfsid(struct mount *);
  881 struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
  882 struct  mount *vfs_busyfs(fsid_t *);
  883 int     vfs_modevent(module_t, int, void *);
  884 void    vfs_mount_error(struct mount *, const char *, ...);
  885 void    vfs_mountroot(void);                    /* mount our root filesystem */
  886 void    vfs_mountedfrom(struct mount *, const char *from);
  887 void    vfs_notify_upper(struct vnode *, int);
  888 void    vfs_oexport_conv(const struct oexport_args *oexp,
  889             struct export_args *exp);
  890 void    vfs_ref(struct mount *);
  891 void    vfs_rel(struct mount *);
  892 struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
  893             struct ucred *);
  894 int     vfs_suser(struct mount *, struct thread *);
  895 void    vfs_unbusy(struct mount *);
  896 void    vfs_unmountall(void);
  897 extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
  898 extern  struct mtx mountlist_mtx;
  899 extern  struct nfs_public nfs_pub;
  900 extern  struct sx vfsconf_sx;
  901 #define vfsconf_lock()          sx_xlock(&vfsconf_sx)
  902 #define vfsconf_unlock()        sx_xunlock(&vfsconf_sx)
  903 #define vfsconf_slock()         sx_slock(&vfsconf_sx)
  904 #define vfsconf_sunlock()       sx_sunlock(&vfsconf_sx)
  905 
  906 /*
  907  * Declarations for these vfs default operations are located in
  908  * kern/vfs_default.c.  They will be automatically used to replace
  909  * null entries in VFS ops tables when registering a new filesystem
  910  * type in the global table.
  911  */
  912 vfs_root_t              vfs_stdroot;
  913 vfs_quotactl_t          vfs_stdquotactl;
  914 vfs_statfs_t            vfs_stdstatfs;
  915 vfs_sync_t              vfs_stdsync;
  916 vfs_sync_t              vfs_stdnosync;
  917 vfs_vget_t              vfs_stdvget;
  918 vfs_fhtovp_t            vfs_stdfhtovp;
  919 vfs_checkexp_t          vfs_stdcheckexp;
  920 vfs_init_t              vfs_stdinit;
  921 vfs_uninit_t            vfs_stduninit;
  922 vfs_extattrctl_t        vfs_stdextattrctl;
  923 vfs_sysctl_t            vfs_stdsysctl;
  924 
  925 void    syncer_suspend(void);
  926 void    syncer_resume(void);
  927 
  928 #else /* !_KERNEL */
  929 
  930 #include <sys/cdefs.h>
  931 
  932 struct stat;
  933 
  934 __BEGIN_DECLS
  935 int     fhlink(struct fhandle *, const char *);
  936 int     fhlinkat(struct fhandle *, int, const char *);
  937 int     fhopen(const struct fhandle *, int);
  938 int     fhreadlink(struct fhandle *, char *, size_t);
  939 int     fhstat(const struct fhandle *, struct stat *);
  940 int     fhstatfs(const struct fhandle *, struct statfs *);
  941 int     fstatfs(int, struct statfs *);
  942 int     getfh(const char *, fhandle_t *);
  943 int     getfhat(int, char *, struct fhandle *, int);
  944 int     getfsstat(struct statfs *, long, int);
  945 int     getmntinfo(struct statfs **, int);
  946 int     lgetfh(const char *, fhandle_t *);
  947 int     mount(const char *, const char *, int, void *);
  948 int     nmount(struct iovec *, unsigned int, int);
  949 int     statfs(const char *, struct statfs *);
  950 int     unmount(const char *, int);
  951 
  952 /* C library stuff */
  953 int     getvfsbyname(const char *, struct xvfsconf *);
  954 __END_DECLS
  955 
  956 #endif /* _KERNEL */
  957 
  958 #endif /* !_SYS_MOUNT_H_ */

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