FreeBSD/Linux Kernel Cross Reference
sys/sys/mount.h

     /*-
      * Copyright (c) 1989, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)mount.h     8.21 (Berkeley) 5/20/95
     * $FreeBSD$
     */
    
    #ifndef _SYS_MOUNT_H_
    #define _SYS_MOUNT_H_
    
    #include <sys/ucred.h>
    #include <sys/queue.h>
    #ifdef _KERNEL
    #include <sys/lock.h>
    #include <sys/lockmgr.h>
    #include <sys/_mutex.h>
    #endif
    
    /*
     * NOTE: When changing statfs structure, mount structure, MNT_* flags or
     * MNTK_* flags also update DDB show mount command in vfs_subr.c.
     */
    
    typedef struct fsid { int32_t val[2]; } fsid_t; /* filesystem id type */
    
    /*
     * File identifier.
     * These are unique per filesystem on a single machine.
     */
    #define MAXFIDSZ        16
    
    struct fid {
            u_short         fid_len;                /* length of data in bytes */
            u_short         fid_reserved;           /* force longword alignment */
            char            fid_data[MAXFIDSZ];     /* data (variable length) */
    };
    
    /*
     * filesystem statistics
     */
    #define MFSNAMELEN      16              /* length of type name including null */
    #define MNAMELEN        88              /* size of on/from name bufs */
    #define STATFS_VERSION  0x20030518      /* current version number */
    struct statfs {
            uint32_t f_version;             /* structure version number */
            uint32_t f_type;                /* type of filesystem */
            uint64_t f_flags;               /* copy of mount exported flags */
            uint64_t f_bsize;               /* filesystem fragment size */
            uint64_t f_iosize;              /* optimal transfer block size */
            uint64_t f_blocks;              /* total data blocks in filesystem */
            uint64_t f_bfree;               /* free blocks in filesystem */
            int64_t  f_bavail;              /* free blocks avail to non-superuser */
            uint64_t f_files;               /* total file nodes in filesystem */
            int64_t  f_ffree;               /* free nodes avail to non-superuser */
            uint64_t f_syncwrites;          /* count of sync writes since mount */
            uint64_t f_asyncwrites;         /* count of async writes since mount */
            uint64_t f_syncreads;           /* count of sync reads since mount */
            uint64_t f_asyncreads;          /* count of async reads since mount */
            uint64_t f_spare[10];           /* unused spare */
            uint32_t f_namemax;             /* maximum filename length */
            uid_t     f_owner;              /* user that mounted the filesystem */
            fsid_t    f_fsid;               /* filesystem id */
            char      f_charspare[80];          /* spare string space */
            char      f_fstypename[MFSNAMELEN]; /* filesystem type name */
            char      f_mntfromname[MNAMELEN];  /* mounted filesystem */
            char      f_mntonname[MNAMELEN];    /* directory on which mounted */
    };
    
    #ifdef _KERNEL
    #define OMFSNAMELEN     16      /* length of fs type name, including null */
    #define OMNAMELEN       (88 - 2 * sizeof(long)) /* size of on/from name bufs */
    
    /* XXX getfsstat.2 is out of date with write and read counter changes here. */
    /* XXX statfs.2 is out of date with read counter changes here. */
   struct ostatfs {
           long    f_spare2;               /* placeholder */
           long    f_bsize;                /* fundamental filesystem block size */
           long    f_iosize;               /* optimal transfer block size */
           long    f_blocks;               /* total data blocks in filesystem */
           long    f_bfree;                /* free blocks in fs */
           long    f_bavail;               /* free blocks avail to non-superuser */
           long    f_files;                /* total file nodes in filesystem */
           long    f_ffree;                /* free file nodes in fs */
           fsid_t  f_fsid;                 /* filesystem id */
           uid_t   f_owner;                /* user that mounted the filesystem */
           int     f_type;                 /* type of filesystem */
           int     f_flags;                /* copy of mount exported flags */
           long    f_syncwrites;           /* count of sync writes since mount */
           long    f_asyncwrites;          /* count of async writes since mount */
           char    f_fstypename[OMFSNAMELEN]; /* fs type name */
           char    f_mntonname[OMNAMELEN]; /* directory on which mounted */
           long    f_syncreads;            /* count of sync reads since mount */
           long    f_asyncreads;           /* count of async reads since mount */
           short   f_spares1;              /* unused spare */
           char    f_mntfromname[OMNAMELEN];/* mounted filesystem */
           short   f_spares2;              /* unused spare */
           /*
            * XXX on machines where longs are aligned to 8-byte boundaries, there
            * is an unnamed int32_t here.  This spare was after the apparent end
            * of the struct until we bit off the read counters from f_mntonname.
            */
           long    f_spare[2];             /* unused spare */
   };
   
   #define MMAXOPTIONLEN   65536           /* maximum length of a mount option */
   
   TAILQ_HEAD(vnodelst, vnode);
   
   struct vfsoptlist;
   struct vfsopt;
   
   /*
    * Structure per mounted filesystem.  Each mounted filesystem has an
    * array of operations and an instance record.  The filesystems are
    * put on a doubly linked list.
    *
    * Lock reference:
    *      m - mountlist_mtx
    *      i - interlock
    *      l - mnt_lock
    *
    * Unmarked fields are considered stable as long as a ref is held.
    *
    */
   struct mount {
           struct lock     mnt_lock;               /* mount structure lock */
           struct mtx      mnt_mtx;                /* mount structure interlock */
           int             mnt_gen;                /* struct mount generation */
   #define mnt_startzero   mnt_list
           TAILQ_ENTRY(mount) mnt_list;            /* (m) mount list */
           struct vfsops   *mnt_op;                /* operations on fs */
           struct vfsconf  *mnt_vfc;               /* configuration info */
           struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
           struct vnode    *mnt_syncer;            /* syncer vnode */
           int             mnt_ref;                /* (i) Reference count */
           struct vnodelst mnt_nvnodelist;         /* (i) list of vnodes */
           int             mnt_nvnodelistsize;     /* (i) # of vnodes */
           int             mnt_writeopcount;       /* (i) write syscalls pending */
           int             mnt_kern_flag;          /* (i) kernel only flags */
           u_int           mnt_flag;               /* (i) flags shared with user */
           u_int           mnt_noasync;            /* (i) # noasync overrides */
           struct vfsoptlist *mnt_opt;             /* current mount options */
           struct vfsoptlist *mnt_optnew;          /* new options passed to fs */
           int             mnt_maxsymlinklen;      /* max size of short symlink */
           struct statfs   mnt_stat;               /* cache of filesystem stats */
           struct ucred    *mnt_cred;              /* credentials of mounter */
           void *          mnt_data;               /* private data */
           time_t          mnt_time;               /* last time written*/
           int             mnt_iosize_max;         /* max size for clusters, etc */
           struct netexport *mnt_export;           /* export list */
           struct label    *mnt_label;             /* MAC label for the fs */
           u_int           mnt_hashseed;           /* Random seed for vfs_hash */
           int             mnt_markercnt;          /* marker vnodes in use */
           int             mnt_holdcnt;            /* hold count */
           int             mnt_holdcntwaiters;     /* waits on hold count */
           int             mnt_secondary_writes;   /* (i) # of secondary writes */
           int             mnt_secondary_accwrites;/* (i) secondary wr. starts */
           struct thread   *mnt_susp_owner;        /* (i) thread owning suspension */
   #define mnt_endzero     mnt_gjprovider
           char            *mnt_gjprovider;        /* gjournal provider name */
           struct lock     mnt_explock;            /* vfs_export walkers lock */
   };
   
   struct vnode *__mnt_vnode_next(struct vnode **mvp, struct mount *mp);
   struct vnode *__mnt_vnode_first(struct vnode **mvp, struct mount *mp);
   void          __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp);
   
   #define MNT_VNODE_FOREACH(vp, mp, mvp) \
           for (vp = __mnt_vnode_first(&(mvp), (mp)); \
                   (vp) != NULL; vp = __mnt_vnode_next(&(mvp), (mp)))
   
   #define MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp)                        \
           __mnt_vnode_markerfree(&(mvp), (mp))
   
   #define MNT_VNODE_FOREACH_ABORT(mp, mvp)                                \
           do {                                                            \
             MNT_ILOCK(mp);                                                \
             MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);                     \
             MNT_IUNLOCK(mp);                                              \
           } while (0)
   
   #define MNT_ILOCK(mp)   mtx_lock(&(mp)->mnt_mtx)
   #define MNT_ITRYLOCK(mp) mtx_trylock(&(mp)->mnt_mtx)
   #define MNT_IUNLOCK(mp) mtx_unlock(&(mp)->mnt_mtx)
   #define MNT_MTX(mp)     (&(mp)->mnt_mtx)
   #define MNT_REF(mp)     (mp)->mnt_ref++
   #define MNT_REL(mp)     do {                                            \
           (mp)->mnt_ref--;                                                \
           if ((mp)->mnt_ref == 0)                                         \
                   wakeup((mp));                                           \
   } while (0)
   
   #endif /* _KERNEL */
   
   /*
    * User specifiable flags.
    */
   #define MNT_RDONLY      0x00000001      /* read only filesystem */
   #define MNT_SYNCHRONOUS 0x00000002      /* filesystem written synchronously */
   #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
   #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
   #define MNT_UNION       0x00000020      /* union with underlying filesystem */
   #define MNT_ASYNC       0x00000040      /* filesystem written asynchronously */
   #define MNT_SUIDDIR     0x00100000      /* special handling of SUID on dirs */
   #define MNT_SOFTDEP     0x00200000      /* soft updates being done */
   #define MNT_NOSYMFOLLOW 0x00400000      /* do not follow symlinks */
   #define MNT_GJOURNAL    0x02000000      /* GEOM journal support enabled */
   #define MNT_MULTILABEL  0x04000000      /* MAC support for individual objects */
   #define MNT_ACLS        0x08000000      /* ACL support enabled */
   #define MNT_NOATIME     0x10000000      /* disable update of file access time */
   #define MNT_NOCLUSTERR  0x40000000      /* disable cluster read */
   #define MNT_NOCLUSTERW  0x80000000      /* disable cluster write */
   
   /*
    * NFS export related mount flags.
    */
   #define MNT_EXRDONLY    0x00000080      /* exported read only */
   #define MNT_EXPORTED    0x00000100      /* filesystem is exported */
   #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
   #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
   #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
   #define MNT_EXPUBLIC    0x20000000      /* public export (WebNFS) */
   
   /*
    * Flags set by internal operations,
    * but visible to the user.
    * XXX some of these are not quite right.. (I've never seen the root flag set)
    */
   #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
   #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
   #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
   #define MNT_USER        0x00008000      /* mounted by a user */
   #define MNT_IGNORE      0x00800000      /* do not show entry in df */
   
   /*
    * Mask of flags that are visible to statfs().
    * XXX I think that this could now become (~(MNT_CMDFLAGS))
    * but the 'mount' program may need changing to handle this.
    */
   #define MNT_VISFLAGMASK (MNT_RDONLY     | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
                           MNT_NOSUID      | MNT_UNION     | \
                           MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
                           MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
                           MNT_LOCAL       | MNT_USER      | MNT_QUOTA     | \
                           MNT_ROOTFS      | MNT_NOATIME   | MNT_NOCLUSTERR| \
                           MNT_NOCLUSTERW  | MNT_SUIDDIR   | MNT_SOFTDEP   | \
                           MNT_IGNORE      | MNT_EXPUBLIC  | MNT_NOSYMFOLLOW | \
                           MNT_GJOURNAL    | MNT_MULTILABEL | MNT_ACLS)
   
   /* Mask of flags that can be updated. */
   #define MNT_UPDATEMASK (MNT_NOSUID      | MNT_NOEXEC    | \
                           MNT_SYNCHRONOUS | MNT_UNION     | MNT_ASYNC     | \
                           MNT_NOATIME | \
                           MNT_NOSYMFOLLOW | MNT_IGNORE    | \
                           MNT_NOCLUSTERR  | MNT_NOCLUSTERW | MNT_SUIDDIR  | \
                           MNT_ACLS        | MNT_USER)
   
   /*
    * External filesystem command modifier flags.
    * Unmount can use the MNT_FORCE flag.
    * XXX: These are not STATES and really should be somewhere else.
    * XXX: MNT_BYFSID collides with MNT_ACLS, but because MNT_ACLS is only used for
    *      mount(2) and MNT_BYFSID is only used for unmount(2) it's harmless.
    */
   #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
   #define MNT_DELEXPORT   0x00020000      /* delete export host lists */
   #define MNT_RELOAD      0x00040000      /* reload filesystem data */
   #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
   #define MNT_SNAPSHOT    0x01000000      /* snapshot the filesystem */
   #define MNT_BYFSID      0x08000000      /* specify filesystem by ID. */
   #define MNT_CMDFLAGS   (MNT_UPDATE      | MNT_DELEXPORT | MNT_RELOAD    | \
                           MNT_FORCE       | MNT_SNAPSHOT  | MNT_BYFSID)
   /*
    * Still available.
    */
   #define MNT_SPARE_0x00000010    0x00000010
   /*
    * Internal filesystem control flags stored in mnt_kern_flag.
    *
    * MNTK_UNMOUNT locks the mount entry so that name lookup cannot proceed
    * past the mount point.  This keeps the subtree stable during mounts
    * and unmounts.
    *
    * MNTK_UNMOUNTF permits filesystems to detect a forced unmount while
    * dounmount() is still waiting to lock the mountpoint. This allows
    * the filesystem to cancel operations that might otherwise deadlock
    * with the unmount attempt (used by NFS).
    *
    * MNTK_NOINSMNTQ is strict subset of MNTK_UNMOUNT. They are separated
    * to allow for failed unmount attempt to restore the syncer vnode for
    * the mount.
    */
   #define MNTK_UNMOUNTF   0x00000001      /* forced unmount in progress */
   #define MNTK_ASYNC      0x00000002      /* filtered async flag */
   #define MNTK_SOFTDEP    0x00000004      /* async disabled by softdep */
   #define MNTK_NOINSMNTQ  0x00000008      /* insmntque is not allowed */
   #define MNTK_REFEXPIRE  0x00000020      /* refcount expiring is happening */
   #define MNTK_UNMOUNT    0x01000000      /* unmount in progress */
   #define MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
   #define MNTK_SUSPEND    0x08000000      /* request write suspension */
   #define MNTK_SUSPEND2   0x04000000      /* block secondary writes */
   #define MNTK_SUSPENDED  0x10000000      /* write operations are suspended */
   #define MNTK_MPSAFE     0x20000000      /* Filesystem is MPSAFE. */
   #define MNTK_NOKNOTE    0x80000000      /* Don't send KNOTEs from VOP hooks */
   #define MNTK_LOOKUP_SHARED      0x40000000 /* FS supports shared lock lookups */
   
   /*
    * Sysctl CTL_VFS definitions.
    *
    * Second level identifier specifies which filesystem. Second level
    * identifier VFS_VFSCONF returns information about all filesystems.
    * Second level identifier VFS_GENERIC is non-terminal.
    */
   #define VFS_VFSCONF             0       /* get configured filesystems */
   #define VFS_GENERIC             0       /* generic filesystem information */
   /*
    * Third level identifiers for VFS_GENERIC are given below; third
    * level identifiers for specific filesystems are given in their
    * mount specific header files.
    */
   #define VFS_MAXTYPENUM  1       /* int: highest defined filesystem type */
   #define VFS_CONF        2       /* struct: vfsconf for filesystem given
                                      as next argument */
   
   /*
    * Flags for various system call interfaces.
    *
    * waitfor flags to vfs_sync() and getfsstat()
    */
   #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
   #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
   #define MNT_LAZY        3       /* push data not written by filesystem syncer */
   #define MNT_SUSPEND     4       /* Suspend file system after sync */
   
   /*
    * Generic file handle
    */
   struct fhandle {
           fsid_t  fh_fsid;        /* Filesystem id of mount point */
           struct  fid fh_fid;     /* Filesys specific id */
   };
   typedef struct fhandle  fhandle_t;
   
   /*
    * Export arguments for local filesystem mount calls.
    */
   struct export_args {
           int     ex_flags;               /* export related flags */
           uid_t   ex_root;                /* mapping for root uid */
           struct  xucred ex_anon;         /* mapping for anonymous user */
           struct  sockaddr *ex_addr;      /* net address to which exported */
           u_char  ex_addrlen;             /* and the net address length */
           struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
           u_char  ex_masklen;             /* and the smask length */
           char    *ex_indexfile;          /* index file for WebNFS URLs */
   };
   
   /*
    * Structure holding information for a publicly exported filesystem
    * (WebNFS). Currently the specs allow just for one such filesystem.
    */
   struct nfs_public {
           int             np_valid;       /* Do we hold valid information */
           fhandle_t       np_handle;      /* Filehandle for pub fs (internal) */
           struct mount    *np_mount;      /* Mountpoint of exported fs */
           char            *np_index;      /* Index file */
   };
   
   /*
    * Filesystem configuration information. One of these exists for each
    * type of filesystem supported by the kernel. These are searched at
    * mount time to identify the requested filesystem.
    *
    * XXX: Never change the first two arguments!
    */
   struct vfsconf {
           u_int   vfc_version;            /* ABI version number */
           char    vfc_name[MFSNAMELEN];   /* filesystem type name */
           struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
           int     vfc_typenum;            /* historic filesystem type number */
           int     vfc_refcount;           /* number mounted of this type */
           int     vfc_flags;              /* permanent flags */
           struct  vfsoptdecl *vfc_opts;   /* mount options */
           TAILQ_ENTRY(vfsconf) vfc_list;  /* list of vfscons */
   };
   
   /* Userland version of the struct vfsconf. */
   struct xvfsconf {
           struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
           char    vfc_name[MFSNAMELEN];   /* filesystem type name */
           int     vfc_typenum;            /* historic filesystem type number */
           int     vfc_refcount;           /* number mounted of this type */
           int     vfc_flags;              /* permanent flags */
           struct  vfsconf *vfc_next;      /* next in list */
   };
   
   #ifndef BURN_BRIDGES
   struct ovfsconf {
           void    *vfc_vfsops;
           char    vfc_name[32];
           int     vfc_index;
           int     vfc_refcount;
           int     vfc_flags;
   };
   #endif
   
   /*
    * NB: these flags refer to IMPLEMENTATION properties, not properties of
    * any actual mounts; i.e., it does not make sense to change the flags.
    */
   #define VFCF_STATIC     0x00010000      /* statically compiled into kernel */
   #define VFCF_NETWORK    0x00020000      /* may get data over the network */
   #define VFCF_READONLY   0x00040000      /* writes are not implemented */
   #define VFCF_SYNTHETIC  0x00080000      /* data does not represent real files */
   #define VFCF_LOOPBACK   0x00100000      /* aliases some other mounted FS */
   #define VFCF_UNICODE    0x00200000      /* stores file names as Unicode */
   #define VFCF_JAIL       0x00400000      /* can be mounted from within a jail */
   
   typedef uint32_t fsctlop_t;
   
   struct vfsidctl {
           int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
           fsid_t          vc_fsid;        /* fsid to operate on */
           char            vc_fstypename[MFSNAMELEN];
                                           /* type of fs 'nfs' or '*' */
           fsctlop_t       vc_op;          /* operation VFS_CTL_* (below) */
           void            *vc_ptr;        /* pointer to data structure */
           size_t          vc_len;         /* sizeof said structure */
           u_int32_t       vc_spare[12];   /* spare (must be zero) */
   };
   
   /* vfsidctl API version. */
   #define VFS_CTL_VERS1   0x01
   
   /*
    * New style VFS sysctls, do not reuse/conflict with the namespace for
    * private sysctls.
    * All "global" sysctl ops have the 33rd bit set:
    * 0x...1....
    * Private sysctl ops should have the 33rd bit unset.
    */
   #define VFS_CTL_QUERY   0x00010001      /* anything wrong? (vfsquery) */
   #define VFS_CTL_TIMEO   0x00010002      /* set timeout for vfs notification */
   #define VFS_CTL_NOLOCKS 0x00010003      /* disable file locking */
   
   struct vfsquery {
           u_int32_t       vq_flags;
           u_int32_t       vq_spare[31];
   };
   
   /* vfsquery flags */
   #define VQ_NOTRESP      0x0001  /* server down */
   #define VQ_NEEDAUTH     0x0002  /* server bad auth */
   #define VQ_LOWDISK      0x0004  /* we're low on space */
   #define VQ_MOUNT        0x0008  /* new filesystem arrived */
   #define VQ_UNMOUNT      0x0010  /* filesystem has left */
   #define VQ_DEAD         0x0020  /* filesystem is dead, needs force unmount */
   #define VQ_ASSIST       0x0040  /* filesystem needs assistance from external
                                      program */
   #define VQ_NOTRESPLOCK  0x0080  /* server lockd down */
   #define VQ_FLAG0100     0x0100  /* placeholder */
   #define VQ_FLAG0200     0x0200  /* placeholder */
   #define VQ_FLAG0400     0x0400  /* placeholder */
   #define VQ_FLAG0800     0x0800  /* placeholder */
   #define VQ_FLAG1000     0x1000  /* placeholder */
   #define VQ_FLAG2000     0x2000  /* placeholder */
   #define VQ_FLAG4000     0x4000  /* placeholder */
   #define VQ_FLAG8000     0x8000  /* placeholder */
   
   #ifdef _KERNEL
   /* Point a sysctl request at a vfsidctl's data. */
   #define VCTLTOREQ(vc, req)                                              \
           do {                                                            \
                   (req)->newptr = (vc)->vc_ptr;                           \
                   (req)->newlen = (vc)->vc_len;                           \
                   (req)->newidx = 0;                                      \
           } while (0)
   #endif
   
   struct iovec;
   struct uio;
   
   #ifdef _KERNEL
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_MOUNT);
   #endif
   extern int maxvfsconf;          /* highest defined filesystem type */
   extern int nfs_mount_type;      /* vfc_typenum for nfs, or -1 */
   
   TAILQ_HEAD(vfsconfhead, vfsconf);
   extern struct vfsconfhead vfsconf;
   
   /*
    * Operations supported on mounted filesystem.
    */
   struct mount_args;
   struct nameidata;
   struct sysctl_req;
   struct mntarg;
   
   typedef int vfs_cmount_t(struct mntarg *ma, void *data, int flags, struct thread *td);
   typedef int vfs_unmount_t(struct mount *mp, int mntflags, struct thread *td);
   typedef int vfs_root_t(struct mount *mp, int flags, struct vnode **vpp,
                       struct thread *td);
   typedef int vfs_quotactl_t(struct mount *mp, int cmds, uid_t uid,
                       void *arg, struct thread *td);
   typedef int vfs_statfs_t(struct mount *mp, struct statfs *sbp,
                       struct thread *td);
   typedef int vfs_sync_t(struct mount *mp, int waitfor, struct thread *td);
   typedef int vfs_vget_t(struct mount *mp, ino_t ino, int flags,
                       struct vnode **vpp);
   typedef int vfs_fhtovp_t(struct mount *mp, struct fid *fhp, struct vnode **vpp);
   typedef int vfs_checkexp_t(struct mount *mp, struct sockaddr *nam,
                       int *extflagsp, struct ucred **credanonp);
   typedef int vfs_init_t(struct vfsconf *);
   typedef int vfs_uninit_t(struct vfsconf *);
   typedef int vfs_extattrctl_t(struct mount *mp, int cmd,
                       struct vnode *filename_vp, int attrnamespace,
                       const char *attrname, struct thread *td);
   typedef int vfs_mount_t(struct mount *mp, struct thread *td);
   typedef int vfs_sysctl_t(struct mount *mp, fsctlop_t op,
                       struct sysctl_req *req);
   typedef void vfs_susp_clean_t(struct mount *mp);
   
   struct vfsops {
           vfs_mount_t             *vfs_mount;
           vfs_cmount_t            *vfs_cmount;
           vfs_unmount_t           *vfs_unmount;
           vfs_root_t              *vfs_root;
           vfs_quotactl_t          *vfs_quotactl;
           vfs_statfs_t            *vfs_statfs;
           vfs_sync_t              *vfs_sync;
           vfs_vget_t              *vfs_vget;
           vfs_fhtovp_t            *vfs_fhtovp;
           vfs_checkexp_t          *vfs_checkexp;
           vfs_init_t              *vfs_init;
           vfs_uninit_t            *vfs_uninit;
           vfs_extattrctl_t        *vfs_extattrctl;
           vfs_sysctl_t            *vfs_sysctl;
           vfs_susp_clean_t        *vfs_susp_clean;
   };
   
   vfs_statfs_t    __vfs_statfs;
   
   #define VFS_MOUNT(MP, P)    (*(MP)->mnt_op->vfs_mount)(MP, P)
   #define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
   #define VFS_ROOT(MP, FLAGS, VPP, P) \
           (*(MP)->mnt_op->vfs_root)(MP, FLAGS, VPP, P)
   #define VFS_QUOTACTL(MP,C,U,A,P)  (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
   #define VFS_STATFS(MP, SBP, P)    __vfs_statfs((MP), (SBP), (P))
   #define VFS_SYNC(MP, WAIT, P)  (*(MP)->mnt_op->vfs_sync)(MP, WAIT, P)
   #define VFS_VGET(MP, INO, FLAGS, VPP) \
           (*(MP)->mnt_op->vfs_vget)(MP, INO, FLAGS, VPP)
   #define VFS_FHTOVP(MP, FIDP, VPP) \
           (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, VPP)
   #define VFS_CHECKEXP(MP, NAM, EXFLG, CRED) \
           (*(MP)->mnt_op->vfs_checkexp)(MP, NAM, EXFLG, CRED)
   #define VFS_EXTATTRCTL(MP, C, FN, NS, N, P) \
           (*(MP)->mnt_op->vfs_extattrctl)(MP, C, FN, NS, N, P)
   #define VFS_SYSCTL(MP, OP, REQ) \
           (*(MP)->mnt_op->vfs_sysctl)(MP, OP, REQ)
   #define VFS_SUSP_CLEAN(MP) \
           ({if (*(MP)->mnt_op->vfs_susp_clean != NULL)            \
                  (*(MP)->mnt_op->vfs_susp_clean)(MP); })
   
   extern int mpsafe_vfs;
   
   #define VFS_NEEDSGIANT_(MP)                                             \
       (!mpsafe_vfs || ((MP) != NULL && ((MP)->mnt_kern_flag & MNTK_MPSAFE) == 0))
   
   #define VFS_NEEDSGIANT(MP) __extension__                                \
   ({                                                                      \
           struct mount *_mp;                                              \
           _mp = (MP);                                                     \
           VFS_NEEDSGIANT_(_mp);                                           \
   })
   
   #define VFS_LOCK_GIANT(MP) __extension__                                \
   ({                                                                      \
           int _locked;                                                    \
           struct mount *_mp;                                              \
           _mp = (MP);                                                     \
           if (VFS_NEEDSGIANT_(_mp)) {                                     \
                   mtx_lock(&Giant);                                       \
                   _locked = 1;                                            \
           } else                                                          \
                   _locked = 0;                                            \
           _locked;                                                        \
   })
   #define VFS_UNLOCK_GIANT(locked)        if ((locked)) mtx_unlock(&Giant);
   #define VFS_ASSERT_GIANT(MP) do                                         \
   {                                                                       \
           struct mount *_mp;                                              \
           _mp = (MP);                                                     \
           if (VFS_NEEDSGIANT_(_mp))                                       \
                   mtx_assert(&Giant, MA_OWNED);                           \
   } while (0)
   
   #define VFS_KNOTE_LOCKED(vp, hint) do                                   \
   {                                                                       \
           if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
                   VN_KNOTE((vp), (hint), 1);                              \
   } while (0)
   
   #define VFS_KNOTE_UNLOCKED(vp, hint) do                                 \
   {                                                                       \
           if (((vp)->v_vflag & VV_NOKNOTE) == 0)                          \
                   VN_KNOTE((vp), (hint), 0);                              \
   } while (0)
   
   #include <sys/module.h>
   
   /*
    * Version numbers.
    */
   #define VFS_VERSION_00  0x19660120
   #define VFS_VERSION     VFS_VERSION_00
   
   #define VFS_SET(vfsops, fsname, flags) \
           static struct vfsconf fsname ## _vfsconf = {            \
                   .vfc_version = VFS_VERSION,                     \
                   .vfc_name = #fsname,                            \
                   .vfc_vfsops = &vfsops,                          \
                   .vfc_typenum = -1,                              \
                   .vfc_flags = flags,                             \
           };                                                      \
           static moduledata_t fsname ## _mod = {                  \
                   #fsname,                                        \
                   vfs_modevent,                                   \
                   & fsname ## _vfsconf                            \
           };                                                      \
           DECLARE_MODULE(fsname, fsname ## _mod, SI_SUB_VFS, SI_ORDER_MIDDLE)
   
   extern  char *mountrootfsname;
   
   /*
    * exported vnode operations
    */
   
   int     dounmount(struct mount *, int, struct thread *);
   
   int     kernel_mount(struct mntarg *ma, int flags);
   int     kernel_vmount(int flags, ...);
   struct mntarg *mount_arg(struct mntarg *ma, const char *name, const void *val, int len);
   struct mntarg *mount_argb(struct mntarg *ma, int flag, const char *name);
   struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);
   struct mntarg *mount_argsu(struct mntarg *ma, const char *name, const void *val, int len);
   void    statfs_scale_blocks(struct statfs *sf, long max_size);
   struct vfsconf *vfs_byname(const char *);
   struct vfsconf *vfs_byname_kld(const char *, struct thread *td, int *);
   void    vfs_mount_destroy(struct mount *);
   void    vfs_event_signal(fsid_t *, u_int32_t, intptr_t);
   void    vfs_freeopts(struct vfsoptlist *opts);
   void    vfs_deleteopt(struct vfsoptlist *opts, const char *name);
   int     vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val);
   int     vfs_getopt(struct vfsoptlist *, const char *, void **, int *);
   char    *vfs_getopts(struct vfsoptlist *, const char *, int *error);
   int     vfs_copyopt(struct vfsoptlist *, const char *, void *, int);
   int     vfs_filteropt(struct vfsoptlist *, const char **legal);
   int     vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...);
   int     vfs_setpublicfs                     /* set publicly exported fs */
               (struct mount *, struct netexport *, struct export_args *);
   void    vfs_msync(struct mount *, int);
   int     vfs_busy(struct mount *, int, struct mtx *, struct thread *);
   int     vfs_export                       /* process mount export info */
               (struct mount *, struct export_args *);
   int     vfs_allocate_syncvnode(struct mount *);
   int     vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions);
   void    vfs_getnewfsid(struct mount *);
   struct cdev *vfs_getrootfsid(struct mount *);
   struct  mount *vfs_getvfs(fsid_t *);      /* return vfs given fsid */
   int     vfs_modevent(module_t, int, void *);
   void    vfs_mount_error(struct mount *, const char *, ...);
   void    vfs_mountroot(void);                    /* mount our root filesystem */
   void    vfs_mountedfrom(struct mount *, const char *from);
   void    vfs_ref(struct mount *);
   void    vfs_rel(struct mount *);
   struct mount *vfs_mount_alloc(struct vnode *, struct vfsconf *, const char *,
               struct thread *);
   int     vfs_suser(struct mount *, struct thread *);
   void    vfs_unbusy(struct mount *, struct thread *);
   void    vfs_unmountall(void);
   extern  TAILQ_HEAD(mntlist, mount) mountlist;   /* mounted filesystem list */
   extern  struct mtx mountlist_mtx;
   extern  struct nfs_public nfs_pub;
   
   /*
    * Declarations for these vfs default operations are located in
    * kern/vfs_default.c, they should be used instead of making "dummy"
    * functions or casting entries in the VFS op table to "enopnotsupp()".
    */
   vfs_root_t              vfs_stdroot;
   vfs_quotactl_t          vfs_stdquotactl;
   vfs_statfs_t            vfs_stdstatfs;
   vfs_sync_t              vfs_stdsync;
   vfs_sync_t              vfs_stdnosync;
   vfs_vget_t              vfs_stdvget;
   vfs_fhtovp_t            vfs_stdfhtovp;
   vfs_checkexp_t          vfs_stdcheckexp;
   vfs_init_t              vfs_stdinit;
   vfs_uninit_t            vfs_stduninit;
   vfs_extattrctl_t        vfs_stdextattrctl;
   vfs_sysctl_t            vfs_stdsysctl;
   
   #else /* !_KERNEL */
   
   #include <sys/cdefs.h>
   
   struct stat;
   
   __BEGIN_DECLS
   int     fhopen(const struct fhandle *, int);
   int     fhstat(const struct fhandle *, struct stat *);
   int     fhstatfs(const struct fhandle *, struct statfs *);
   int     fstatfs(int, struct statfs *);
   int     getfh(const char *, fhandle_t *);
   int     getfsstat(struct statfs *, long, int);
   int     getmntinfo(struct statfs **, int);
   int     lgetfh(const char *, fhandle_t *);
   int     mount(const char *, const char *, int, void *);
   int     nmount(struct iovec *, unsigned int, int);
   int     statfs(const char *, struct statfs *);
   int     unmount(const char *, int);
   
   /* C library stuff */
   int     getvfsbyname(const char *, struct xvfsconf *);
   __END_DECLS
   
   #endif /* _KERNEL */
   
   #endif /* !_SYS_MOUNT_H_ */

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