xnu-4903.270.47.tar.gz

[apple/xnu.git] / bsd / sys / mount.h

diff --git a/bsd/sys/mount.h b/bsd/sys/mount.h
index dbb687214b50b74cc01c6ba25de7aa88b690ad4e..bff53904b556a74baa57e46fb33c9a07ea565589 100644 (file)
--- a/bsd/sys/mount.h
+++ b/bsd/sys/mount.h
@@ -1,17 +1,20 @@
 /*
 /*

- * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2017 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  *
  *

- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
- * 

  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in

- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- * 
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *

  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,


@@ -19,8 +22,8 @@
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  * Please see the License for the specific language governing rights and
  * limitations under the License.

- * 
- * @APPLE_LICENSE_HEADER_END@
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
 /*
  */
 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
 /*


@@ -57,338 +60,1346 @@
  *
  *     @(#)mount.h     8.21 (Berkeley) 5/20/95
  */
  *
  *     @(#)mount.h     8.21 (Berkeley) 5/20/95
  */

+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections.  This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
+

 
 #ifndef _SYS_MOUNT_H_
 
 #ifndef _SYS_MOUNT_H_

-#define        _SYS_MOUNT_H_
+#define _SYS_MOUNT_H_

 
 #include <sys/appleapiopts.h>
 
 #include <sys/appleapiopts.h>

+#include <sys/cdefs.h>
+#include <sys/attr.h>           /* needed for vol_capabilities_attr_t */
+

 #ifndef KERNEL
 #ifndef KERNEL

+#include <stdint.h>

 #include <sys/ucred.h>
 #include <sys/ucred.h>

+#include <sys/queue.h>          /* XXX needed for user builds */
+#include <Availability.h>
+#else
+#include <sys/kernel_types.h>
+#include <uuid/uuid.h>

 #endif
 #endif

-#include <sys/queue.h>
-#include <sys/lock.h>
-#include <net/radix.h>
-#include <sys/socket.h>                /* XXX for AF_MAX */

 
 

-typedef struct fsid { int32_t val[2]; } fsid_t;        /* file system id type */
+#include <sys/_types/_fsid_t.h> /* file system id type */

 
 /*
 
 /*

- * File identifier.
- * These are unique per filesystem on a single machine.
+ * file system statistics

  */
  */

-#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) */
-};
+#define MFSNAMELEN      15      /* length of fs type name, not inc. null */
+#define MFSTYPENAMELEN  16      /* length of fs type name including null */
+
+#if __DARWIN_64_BIT_INO_T
+#define MNAMELEN        MAXPATHLEN      /* length of buffer for returned name */
+#else /* ! __DARWIN_64_BIT_INO_T */
+#define MNAMELEN        90              /* length of buffer for returned name */
+#endif /* __DARWIN_64_BIT_INO_T */
+
+#define __DARWIN_STRUCT_STATFS64 { \
+       uint32_t        f_bsize;        /* fundamental file system block size */ \
+       int32_t         f_iosize;       /* optimal transfer block size */ \
+       uint64_t        f_blocks;       /* total data blocks in file system */ \
+       uint64_t        f_bfree;        /* free blocks in fs */ \
+       uint64_t        f_bavail;       /* free blocks avail to non-superuser */ \
+       uint64_t        f_files;        /* total file nodes in file system */ \
+       uint64_t        f_ffree;        /* free file nodes in fs */ \
+       fsid_t          f_fsid;         /* file system id */ \
+       uid_t           f_owner;        /* user that mounted the filesystem */ \
+       uint32_t        f_type;         /* type of filesystem */ \
+       uint32_t        f_flags;        /* copy of mount exported flags */ \
+       uint32_t        f_fssubtype;    /* fs sub-type (flavor) */ \
+       char            f_fstypename[MFSTYPENAMELEN];   /* fs type name */ \
+       char            f_mntonname[MAXPATHLEN];        /* directory on which mounted */ \
+       char            f_mntfromname[MAXPATHLEN];      /* mounted filesystem */ \
+       uint32_t        f_reserved[8];  /* For future use */ \
+}
+
+#if !__DARWIN_ONLY_64_BIT_INO_T
+
+struct statfs64 __DARWIN_STRUCT_STATFS64;
+
+#endif /* !__DARWIN_ONLY_64_BIT_INO_T */
+
+#if __DARWIN_64_BIT_INO_T
+
+struct statfs __DARWIN_STRUCT_STATFS64;
+
+#else /* !__DARWIN_64_BIT_INO_T */

 
 /*
 
 /*

- * file system statistics
+ * LP64 - WARNING - must be kept in sync with struct user_statfs in mount_internal.h.

  */
  */

+struct statfs {
+       short   f_otype;                /* TEMPORARY SHADOW COPY OF f_type */
+       short   f_oflags;               /* TEMPORARY SHADOW COPY OF f_flags */
+       long    f_bsize;                /* fundamental file system block size */
+       long    f_iosize;               /* optimal transfer block size */
+       long    f_blocks;               /* total data blocks in file system */
+       long    f_bfree;                /* free blocks in fs */
+       long    f_bavail;               /* free blocks avail to non-superuser */
+       long    f_files;                /* total file nodes in file system */
+       long    f_ffree;                /* free file nodes in fs */
+       fsid_t  f_fsid;                 /* file system id */
+       uid_t   f_owner;                /* user that mounted the filesystem */
+       short   f_reserved1;    /* spare for later */
+       short   f_type;                 /* type of filesystem */
+       long    f_flags;                /* copy of mount exported flags */
+       long    f_reserved2[2]; /* reserved for future use */
+       char    f_fstypename[MFSNAMELEN]; /* fs type name */
+       char    f_mntonname[MNAMELEN];  /* directory on which mounted */
+       char    f_mntfromname[MNAMELEN];/* mounted filesystem */
+       char    f_reserved3;    /* For alignment */
+       long    f_reserved4[4]; /* For future use */
+};

 
 

-#define        MFSNAMELEN      15      /* length of fs type name, not inc. null */
-#define        MNAMELEN        90      /* length of buffer for returned name */
+#endif /* __DARWIN_64_BIT_INO_T */

 
 

-struct statfs {
-       short   f_otype;                /* TEMPORARY SHADOW COPY OF f_type */
-       short   f_oflags;               /* TEMPORARY SHADOW COPY OF f_flags */
-       long    f_bsize;                /* fundamental file system block size */
-       long    f_iosize;               /* optimal transfer block size */
-       long    f_blocks;               /* total data blocks in file system */
-       long    f_bfree;                /* free blocks in fs */
-       long    f_bavail;               /* free blocks avail to non-superuser */
-       long    f_files;                /* total file nodes in file system */
-       long    f_ffree;                /* free file nodes in fs */
-       fsid_t  f_fsid;                 /* file system id */
-       uid_t   f_owner;                /* user that mounted the filesystem */
-       short   f_reserved1;    /* spare for later */
-       short   f_type;                 /* type of filesystem */
-    long       f_flags;                /* copy of mount exported flags */
-       long    f_reserved2[2]; /* reserved for future use */
-       char    f_fstypename[MFSNAMELEN]; /* fs type name */
-       char    f_mntonname[MNAMELEN];  /* directory on which mounted */
-       char    f_mntfromname[MNAMELEN];/* mounted filesystem */
-#if COMPAT_GETFSSTAT
-       char    f_reserved3[0]; /* For alignment */
-       long    f_reserved4[0]; /* For future use */
-#else
-       char    f_reserved3;    /* For alignment */
-       long    f_reserved4[4]; /* For future use */
-#endif
+#pragma pack(4)
+
+struct vfsstatfs {
+       uint32_t        f_bsize;        /* fundamental file system block size */
+       size_t          f_iosize;       /* optimal transfer block size */
+       uint64_t        f_blocks;       /* total data blocks in file system */
+       uint64_t        f_bfree;        /* free blocks in fs */
+       uint64_t        f_bavail;       /* free blocks avail to non-superuser */
+       uint64_t        f_bused;        /* free blocks avail to non-superuser */
+       uint64_t        f_files;        /* total file nodes in file system */
+       uint64_t        f_ffree;        /* free file nodes in fs */
+       fsid_t          f_fsid;         /* file system id */
+       uid_t           f_owner;        /* user that mounted the filesystem */
+       uint64_t        f_flags;        /* copy of mount exported flags */
+       char            f_fstypename[MFSTYPENAMELEN];/* fs type name inclus */
+       char            f_mntonname[MAXPATHLEN];/* directory on which mounted */
+       char            f_mntfromname[MAXPATHLEN];/* mounted filesystem */
+       uint32_t        f_fssubtype;     /* fs sub-type (flavor) */
+       void            *f_reserved[2];         /* For future use == 0 */

 };
 
 };
 

-#ifdef __APPLE_API_PRIVATE
+#pragma pack()
+
+#ifdef KERNEL

 /*
 /*

- * Structure per mounted file system.  Each mounted file system has an
- * array of operations and an instance record.  The file systems are
- * put on a doubly linked list.
- */
-LIST_HEAD(vnodelst, vnode);
-
-struct mount {
-       CIRCLEQ_ENTRY(mount) mnt_list;          /* mount list */
-       struct vfsops   *mnt_op;                /* operations on fs */
-       struct vfsconf  *mnt_vfc;               /* configuration info */
-       struct vnode    *mnt_vnodecovered;      /* vnode we mounted on */
-       struct vnodelst mnt_vnodelist;          /* list of vnodes this mount */
-       struct lock__bsd__ mnt_lock;            /* mount structure lock */
-       int             mnt_flag;               /* flags */
-       int             mnt_kern_flag;          /* kernel only flags */
-       int             mnt_maxsymlinklen;      /* max size of short symlink */
-       struct statfs   mnt_stat;               /* cache of filesystem stats */
-       qaddr_t         mnt_data;               /* private data */
-       /* Cached values of the IO constraints for the device */
-       u_int32_t       mnt_maxreadcnt; /* Max. byte count for read */
-       u_int32_t       mnt_maxwritecnt;        /* Max. byte count for write */
-       u_int16_t       mnt_segreadcnt; /* Max. segment count for read */
-       u_int16_t       mnt_segwritecnt;        /* Max. segment count for write */
+ * Kernel level support for the VFS_GETATTR(), VFS_SETATTR() for use in
+ * implementation of filesystem KEXTs, and by the vfs_getattr() and
+ * vfs_setattr() KPIs.
+ */
+
+#define VFSATTR_INIT(s)                 ((s)->f_supported = (s)->f_active = 0LL)
+#define VFSATTR_SET_SUPPORTED(s, a)     ((s)->f_supported |= VFSATTR_ ## a)
+#define VFSATTR_IS_SUPPORTED(s, a)      ((s)->f_supported & VFSATTR_ ## a)
+#define VFSATTR_CLEAR_ACTIVE(s, a)      ((s)->f_active &= ~VFSATTR_ ## a)
+#define VFSATTR_IS_ACTIVE(s, a)         ((s)->f_active & VFSATTR_ ## a)
+#define VFSATTR_ALL_SUPPORTED(s)        (((s)->f_active & (s)->f_supported) == (s)->f_active)
+#define VFSATTR_WANTED(s, a)            ((s)->f_active |= VFSATTR_ ## a)
+#define VFSATTR_RETURN(s, a, x)         do { (s)-> a = (x); VFSATTR_SET_SUPPORTED(s, a);} while(0)
+
+#define VFSATTR_f_objcount              (1LL<<  0)
+#define VFSATTR_f_filecount             (1LL<<  1)
+#define VFSATTR_f_dircount              (1LL<<  2)
+#define VFSATTR_f_maxobjcount           (1LL<<  3)
+#define VFSATTR_f_bsize                 (1LL<< 4)
+#define VFSATTR_f_iosize                (1LL<<  5)
+#define VFSATTR_f_blocks                (1LL<<  6)
+#define VFSATTR_f_bfree                 (1LL<<  7)
+#define VFSATTR_f_bavail                (1LL<<  8)
+#define VFSATTR_f_bused                 (1LL<<  9)
+#define VFSATTR_f_files                 (1LL<< 10)
+#define VFSATTR_f_ffree                 (1LL<< 11)
+#define VFSATTR_f_fsid                  (1LL<< 12)
+#define VFSATTR_f_owner                 (1LL<< 13)
+#define VFSATTR_f_capabilities          (1LL<< 14)
+#define VFSATTR_f_attributes            (1LL<< 15)
+#define VFSATTR_f_create_time           (1LL<< 16)
+#define VFSATTR_f_modify_time           (1LL<< 17)
+#define VFSATTR_f_access_time           (1LL<< 18)
+#define VFSATTR_f_backup_time           (1LL<< 19)
+#define VFSATTR_f_fssubtype             (1LL<< 20)
+#define VFSATTR_f_vol_name              (1LL<< 21)
+#define VFSATTR_f_signature             (1LL<< 22)
+#define VFSATTR_f_carbon_fsid           (1LL<< 23)
+#define VFSATTR_f_uuid                  (1LL<< 24)
+#define VFSATTR_f_quota         (1LL<< 25)
+#define VFSATTR_f_reserved              (1LL<< 26)
+
+
+/*
+ * Argument structure.
+ */
+#pragma pack(4)
+/*
+ * Note: the size of the vfs_attr structure can change.
+ * A kext should only reference the fields that are
+ * marked as active; it should not depend on the actual
+ * size of the structure or attempt to copy it.
+ */
+struct vfs_attr {
+       uint64_t        f_supported;
+       uint64_t        f_active;
+
+       uint64_t        f_objcount;     /* number of filesystem objects in volume */
+       uint64_t        f_filecount;    /* ... files */
+       uint64_t        f_dircount;     /* ... directories */
+       uint64_t        f_maxobjcount;  /* maximum number of filesystem objects */
+
+       uint32_t        f_bsize;        /* block size for the below size values */
+       size_t          f_iosize;       /* optimal transfer block size */
+       uint64_t        f_blocks;       /* total data blocks in file system */
+       uint64_t        f_bfree;        /* free blocks in fs */
+       uint64_t        f_bavail;       /* free blocks avail to non-superuser */
+       uint64_t        f_bused;        /* blocks in use */
+       uint64_t        f_files;        /* total file nodes in file system */
+       uint64_t        f_ffree;        /* free file nodes in fs */
+       fsid_t          f_fsid;         /* file system id */
+       uid_t           f_owner;        /* user that mounted the filesystem */
+
+       vol_capabilities_attr_t f_capabilities;
+       vol_attributes_attr_t f_attributes;
+
+       struct timespec f_create_time;  /* creation time */
+       struct timespec f_modify_time;  /* last modification time */
+       struct timespec f_access_time;  /* time of last access */
+       struct timespec f_backup_time;  /* last backup time */
+
+       uint32_t        f_fssubtype;    /* filesystem subtype */
+
+       char            *f_vol_name;    /* volume name */
+
+       uint16_t        f_signature;    /* used for ATTR_VOL_SIGNATURE, Carbon's FSVolumeInfo.signature */
+       uint16_t        f_carbon_fsid;  /* same as Carbon's FSVolumeInfo.filesystemID */
+       uuid_t          f_uuid;         /* file system UUID (version 3 or 5), available in 10.6 and later */
+       uint64_t        f_quota;        /* total quota data blocks in file system */
+       uint64_t        f_reserved;     /* total reserved data blocks in file system */

 };
 };

-#endif /* __APPLE_API_PRIVATE */
+
+#pragma pack()
+
+#endif  /* KERNEL */

 
 /*
  * User specifiable flags.
  *
  * Unmount uses MNT_FORCE flag.
  */
 
 /*
  * User specifiable flags.
  *
  * Unmount uses MNT_FORCE flag.
  */

-#define        MNT_RDONLY      0x00000001      /* read only filesystem */
-#define        MNT_SYNCHRONOUS 0x00000002      /* file system written synchronously */
-#define        MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
-#define        MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
-#define        MNT_NODEV       0x00000010      /* don't interpret special files */
-#define        MNT_UNION       0x00000020      /* union with underlying filesystem */
-#define        MNT_ASYNC       0x00000040      /* file system written asynchronously */
-#define MNT_DONTBROWSE 0x00100000      /* file system is not appropriate path to user data */
-#define MNT_UNKNOWNPERMISSIONS 0x00200000 /* no known mapping for uid/gid in permissions information on disk */
-#define MNT_AUTOMOUNTED 0x00400000     /* filesystem was mounted by automounter */
-#define MNT_JOURNALED   0x00800000  /* filesystem is journaled */
+#define MNT_RDONLY      0x00000001      /* read only filesystem */
+#define MNT_SYNCHRONOUS 0x00000002      /* file system written synchronously */
+#define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
+#define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
+#define MNT_NODEV       0x00000010      /* don't interpret special files */
+#define MNT_UNION       0x00000020      /* union with underlying filesystem */
+#define MNT_ASYNC       0x00000040      /* file system written asynchronously */
+#define MNT_CPROTECT    0x00000080      /* file system supports content protection */

 
 /*
  * NFS export related mount flags.
  */
 
 /*
  * NFS export related mount flags.
  */

-#define        MNT_EXRDONLY    0x00000080      /* exported read only */
-#define        MNT_EXPORTED    0x00000100      /* file system 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_EXPORTED    0x00000100      /* file system is exported */
+
+/*
+ * MAC labeled / "quarantined" flag
+ */
+#define MNT_QUARANTINE  0x00000400      /* file system is quarantined */

 
 /*
  * Flags set by internal operations.
  */
 
 /*
  * Flags set by internal operations.
  */

-#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_DOVOLFS     0x00008000      /* FS supports volfs */
-#define MNT_FIXEDSCRIPTENCODING        0x10000000      /* FS supports only fixed script encoding [HFS] */
+#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_DOVOLFS     0x00008000      /* FS supports volfs (deprecated flag in Mac OS X 10.5) */
+
+
+#define MNT_DONTBROWSE  0x00100000      /* file system is not appropriate path to user data */
+#define MNT_IGNORE_OWNERSHIP 0x00200000 /* VFS will ignore ownership information on filesystem objects */
+#define MNT_AUTOMOUNTED 0x00400000      /* filesystem was mounted by automounter */
+#define MNT_JOURNALED   0x00800000      /* filesystem is journaled */
+#define MNT_NOUSERXATTR 0x01000000      /* Don't allow user extended attributes */
+#define MNT_DEFWRITE    0x02000000      /* filesystem should defer writes */
+#define MNT_MULTILABEL  0x04000000      /* MAC support for individual labels */
+#define MNT_NOATIME             0x10000000      /* disable update of file access time */
+#define MNT_SNAPSHOT    0x40000000 /* The mount is a snapshot */
+#ifdef BSD_KERNEL_PRIVATE
+/* #define MNT_IMGSRC_BY_INDEX 0x20000000 see sys/imgsrc.h */
+#endif /* BSD_KERNEL_PRIVATE */
+
+/* backwards compatibility only */
+#define MNT_UNKNOWNPERMISSIONS MNT_IGNORE_OWNERSHIP
+

 
 /*
  * XXX I think that this could now become (~(MNT_CMDFLAGS))
  * but the 'mount' program may need changing to handle this.
  */
 
 /*
  * 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_NODEV     | MNT_UNION     | \
-                       MNT_ASYNC       | MNT_EXRDONLY  | MNT_EXPORTED  | \
-                       MNT_DEFEXPORTED | MNT_EXPORTANON| MNT_EXKERB    | \
-                       MNT_LOCAL       |               MNT_QUOTA       | \
-                       MNT_ROOTFS      | MNT_DOVOLFS   | MNT_DONTBROWSE | \
-                       MNT_UNKNOWNPERMISSIONS | MNT_AUTOMOUNTED | MNT_JOURNALED | MNT_FIXEDSCRIPTENCODING )
+#define MNT_VISFLAGMASK (MNT_RDONLY    | MNT_SYNCHRONOUS | MNT_NOEXEC  | \
+                       MNT_NOSUID      | MNT_NODEV     | MNT_UNION     | \
+                       MNT_ASYNC       | MNT_EXPORTED  | MNT_QUARANTINE | \
+                       MNT_LOCAL       | MNT_QUOTA | \
+                       MNT_ROOTFS      | MNT_DOVOLFS   | MNT_DONTBROWSE | \
+                       MNT_IGNORE_OWNERSHIP | MNT_AUTOMOUNTED | MNT_JOURNALED | \
+                       MNT_NOUSERXATTR | MNT_DEFWRITE  | MNT_MULTILABEL | \
+                       MNT_NOATIME | MNT_SNAPSHOT | MNT_CPROTECT)

 /*
  * External filesystem command modifier flags.
  * Unmount can use the MNT_FORCE flag.
  * XXX These are not STATES and really should be somewhere else.
  * External filesystem control flags.
  */
 /*
  * External filesystem command modifier flags.
  * Unmount can use the MNT_FORCE flag.
  * XXX These are not STATES and really should be somewhere else.
  * External filesystem control flags.
  */

-#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_CMDFLAGS   (MNT_UPDATE|MNT_DELEXPORT|MNT_RELOAD|MNT_FORCE)
+#define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
+#define MNT_NOBLOCK     0x00020000      /* don't block unmount if not responding */
+#define MNT_RELOAD      0x00040000      /* reload filesystem data */
+#define MNT_FORCE       0x00080000      /* force unmount or readonly change */
+#define MNT_CMDFLAGS    (MNT_UPDATE|MNT_NOBLOCK|MNT_RELOAD|MNT_FORCE)
+
+

 
 

-/*
- * 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.
- */
-#define MNTK_UNMOUNT   0x01000000      /* unmount in progress */
-#define        MNTK_MWAIT      0x02000000      /* waiting for unmount to finish */
-#define MNTK_WANTRDWR  0x04000000      /* upgrade to read/write requested */
-#if REV_ENDIAN_FS
-#define MNT_REVEND     0x08000000      /* Reverse endian FS */
-#endif /* REV_ENDIAN_FS */

 /*
  * Sysctl CTL_VFS definitions.
  *
  * Second level identifier specifies which filesystem. Second level
  * identifier VFS_GENERIC returns information about all filesystems.
  */
 /*
  * Sysctl CTL_VFS definitions.
  *
  * Second level identifier specifies which filesystem. Second level
  * identifier VFS_GENERIC returns information about all filesystems.
  */

-#define        VFS_GENERIC             0       /* generic filesystem information */
-#define VFS_NUMMNTOPS          1       /* int: total num of vfs mount/unmount operations */
+#define VFS_GENERIC             0       /* generic filesystem information */
+#define VFS_NUMMNTOPS           1       /* int: total num of vfs mount/unmount operations */

 /*
  * Third level identifiers for VFS_GENERIC are given below; third
  * level identifiers for specific filesystems are given in their
  * mount specific header files.
  */
 /*
  * 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 */
+#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()
  */
 /*
  * 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_WAIT        1       /* synchronized I/O file integrity completion */
+#define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
+#define MNT_DWAIT       4       /* synchronized I/O data integrity completion */
+
+
+#ifndef KERNEL
+struct mount;
+typedef struct mount * mount_t;
+struct vnode;
+typedef struct vnode * vnode_t;
+#endif
+
+/* Reserved fields preserve binary compatibility */
+struct vfsconf {
+       uint32_t vfc_reserved1;         /* opaque */
+       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 */
+       uint32_t vfc_reserved2;         /* opaque */
+       uint32_t vfc_reserved3;         /* opaque */
+};
+
+struct vfsidctl {
+       int             vc_vers;        /* should be VFSIDCTL_VERS1 (below) */
+       fsid_t          vc_fsid;        /* fsid to operate on. */
+       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
+
+#ifdef KERNEL
+struct user_vfsidctl {
+       int                              vc_vers;       /* should be VFSIDCTL_VERS1 (below) */
+       fsid_t                   vc_fsid;               /* fsid to operate on. */
+       user_addr_t              vc_ptr __attribute((aligned(8)));      /* pointer to data structure. */
+       user_size_t              vc_len;                /* sizeof said structure. */
+       u_int32_t                vc_spare[12];  /* spare (must be zero). */
+};
+
+struct user32_vfsidctl {
+       int                              vc_vers;       /* should be VFSIDCTL_VERS1 (below) */
+       fsid_t                   vc_fsid;               /* fsid to operate on. */
+       user32_addr_t    vc_ptr;                /* pointer to data structure. */
+       user32_size_t    vc_len;                /* sizeof said structure. */
+       u_int32_t                vc_spare[12];  /* spare (must be zero). */
+};
+
+union union_vfsidctl { /* the fields vc_vers and vc_fsid are compatible */
+       struct user32_vfsidctl vc32;
+       struct user_vfsidctl vc64;
+};
+
+#endif /* KERNEL */

 
 /*
 
 /*

- * Generic file handle
+ * New style VFS sysctls, do not reuse/conflict with the namespace for
+ * private sysctls.

  */
  */

-struct fhandle {
-       fsid_t  fh_fsid;        /* File system id of mount point */
-       struct  fid fh_fid;     /* File sys specific id */
+#define VFS_CTL_STATFS  0x00010001      /* statfs */
+#define VFS_CTL_UMOUNT  0x00010002      /* unmount */
+#define VFS_CTL_QUERY   0x00010003      /* anything wrong? (vfsquery) */
+#define VFS_CTL_NEWADDR 0x00010004      /* reconnect to new address */
+#define VFS_CTL_TIMEO   0x00010005      /* set timeout for vfs notification */
+#define VFS_CTL_NOLOCKS 0x00010006      /* disable file locking */
+#define VFS_CTL_SADDR   0x00010007      /* get server address */
+#define VFS_CTL_DISC    0x00010008      /* server disconnected */
+#define VFS_CTL_SERVERINFO  0x00010009  /* information about fs server */
+#define VFS_CTL_NSTATUS 0x0001000A      /* netfs mount status */
+
+struct vfsquery {
+       u_int32_t       vq_flags;
+       u_int32_t       vq_spare[31];

 };
 };

-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  ucred ex_anon;          /* mapping for anonymous user */
-       struct  sockaddr *ex_addr;      /* net address to which exported */
-       int     ex_addrlen;             /* and the net address length */
-       struct  sockaddr *ex_mask;      /* mask of valid bits in saddr */
-       int     ex_masklen;             /* and the smask length */
+struct vfs_server {
+       int32_t  vs_minutes;                    /* minutes until server goes down. */
+       u_int8_t vs_server_name[MAXHOSTNAMELEN * 3]; /* UTF8 server name to display (null terminated) */

 };
 
 };
 

-#ifdef __APPLE_API_UNSTABLE

 /*
 /*

- * 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.
+ * NetFS mount status - returned by VFS_CTL_NSTATUS

  */
  */

-struct vfsconf {
-       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 */
-       int     (*vfc_mountroot)(void); /* if != NULL, routine to mount root */
-       struct  vfsconf *vfc_next;      /* next in list */
+struct netfs_status {
+       u_int32_t       ns_status;              // Current status of mount (vfsquery flags)
+       char            ns_mountopts[512];      // Significant mount options
+       uint32_t        ns_waittime;            // Time waiting for reply (sec)
+       uint32_t        ns_threadcount;         // Number of threads blocked on network calls
+       uint64_t        ns_threadids[0];        // Thread IDs of those blocked threads

 };
 
 };
 

-#endif /*__APPLE_API_UNSTABLE */
+/* 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_UPDATE       0x0100  /* filesystem information has changed */
+#define VQ_VERYLOWDISK  0x0200  /* file system has *very* little disk space left */
+#define VQ_SYNCEVENT    0x0400  /* a sync just happened (not set by kernel starting Mac OS X 10.9) */
+#define VQ_SERVEREVENT  0x0800  /* server issued notification/warning */
+#define VQ_QUOTA        0x1000  /* a user quota has been hit */
+#define VQ_NEARLOWDISK          0x2000  /* Above lowdisk and below desired disk space */
+#define VQ_DESIRED_DISK         0x4000  /* the desired disk space */
+#define VQ_FLAG8000     0x8000  /* placeholder */
+

 
 #ifdef KERNEL
 
 #ifdef KERNEL

-#ifdef __APPLE_API_UNSTABLE
-extern int maxvfsconf;         /* highest defined filesystem type */
-extern struct vfsconf *vfsconf;        /* head of list of filesystem types */
-extern int maxvfsslots;                /* Maximum slots available to be used */
-extern int numused_vfsslots;   /* number of slots already used */

 
 

-int    vfsconf_add __P((struct vfsconf *));
-int    vfsconf_del __P((char *));
+/* Structure for setting device IO parameters per mount point */
+struct vfsioattr {
+       u_int32_t       io_maxreadcnt;          /* Max. byte count for read */
+       u_int32_t       io_maxwritecnt;         /* Max. byte count for write */
+       u_int32_t       io_segreadcnt;          /* Max. segment count for read */
+       u_int32_t       io_segwritecnt;         /* Max. segment count for write */
+       u_int32_t       io_maxsegreadsize;      /* Max. segment read size  */
+       u_int32_t       io_maxsegwritesize;     /* Max. segment write size */
+       u_int32_t       io_devblocksize;        /* the underlying device block size */
+       u_int32_t       io_flags;                       /* flags for underlying device */
+       union {
+               int64_t io_max_swappin_available;
+               // On 32 bit architectures, we don't have any spare
+               void *io_reserved[2];
+       };
+};
+
+#define VFS_IOATTR_FLAGS_FUA                            0x00000001      /* Write-through cache supported */
+#define VFS_IOATTR_FLAGS_UNMAP                          0x00000002      /* Unmap (trim) supported */
+#define VFS_IOATTR_FLAGS_SWAPPIN_SUPPORTED      0x00000010      /* Pinning swap file supported */

 
 /*
 
 /*

- * Operations supported on mounted file system.
+ * Filesystem Registration information

  */
  */

-#ifdef __STDC__
-struct nameidata;
-struct mbuf;
-#endif
+#define VFS_TBLTHREADSAFE               0x0001  /* Only threadsafe filesystems are supported */
+#define VFS_TBLFSNODELOCK               0x0002  /* Only threadsafe filesystems are supported */
+#define VFS_TBLNOTYPENUM                0x0008
+#define VFS_TBLLOCALVOL                 0x0010
+#define VFS_TBL64BITREADY               0x0020
+#define VFS_TBLNATIVEXATTR              0x0040
+#define VFS_TBLDIRLINKS                 0x0080
+#define VFS_TBLUNMOUNT_PREFLIGHT        0x0100  /* does a preflight check before unmounting */
+#define VFS_TBLGENERICMNTARGS           0x0200  /* force generic mount args for local fs */
+#define VFS_TBLREADDIR_EXTENDED         0x0400  /* fs supports VNODE_READDIR_EXTENDED */
+#define VFS_TBLNOMACLABEL               0x1000
+#define VFS_TBLVNOP_PAGEINV2            0x2000
+#define VFS_TBLVNOP_PAGEOUTV2           0x4000
+#define VFS_TBLVNOP_NOUPDATEID_RENAME   0x8000  /* vfs should not call vnode_update_ident on rename */
+#define VFS_TBLVNOP_SECLUDE_RENAME      0x10000
+#define VFS_TBLCANMOUNTROOT             0x20000
+
+
+struct vfs_fsentry {
+       struct vfsops * vfe_vfsops;     /* vfs operations */
+       int             vfe_vopcnt;     /* # of vnodeopv_desc being registered (reg, spec, fifo ...) */
+       struct vnodeopv_desc ** vfe_opvdescs; /* null terminated;  */
+       int                     vfe_fstypenum;  /* historic filesystem type number */
+       char            vfe_fsname[MFSNAMELEN]; /* filesystem type name */
+       uint32_t        vfe_flags;              /* defines the FS capabilities */
+       void *              vfe_reserv[2];/* reserved for future use; set this to zero*/
+};
+
+

 
 struct vfsops {
 
 struct vfsops {

-       int     (*vfs_mount)    __P((struct mount *mp, char *path, caddr_t data,
-                                   struct nameidata *ndp, struct proc *p));
-       int     (*vfs_start)    __P((struct mount *mp, int flags,
-                                   struct proc *p));
-       int     (*vfs_unmount)  __P((struct mount *mp, int mntflags,
-                                   struct proc *p));
-       int     (*vfs_root)     __P((struct mount *mp, struct vnode **vpp));
-       int     (*vfs_quotactl) __P((struct mount *mp, int cmds, uid_t uid,
-                                   caddr_t arg, struct proc *p));
-       int     (*vfs_statfs)   __P((struct mount *mp, struct statfs *sbp,
-                                   struct proc *p));
-       int     (*vfs_sync)     __P((struct mount *mp, int waitfor,
-                                   struct ucred *cred, struct proc *p));
-       int     (*vfs_vget)     __P((struct mount *mp, void *ino,
-                                   struct vnode **vpp));
-       int     (*vfs_fhtovp)   __P((struct mount *mp, struct fid *fhp,
-                                   struct mbuf *nam, struct vnode **vpp,
-                                   int *exflagsp, struct ucred **credanonp));
-       int     (*vfs_vptofh)   __P((struct vnode *vp, struct fid *fhp));
-       int     (*vfs_init)     __P((struct vfsconf *));
-       int     (*vfs_sysctl)   __P((int *, u_int, void *, size_t *, void *,
-                                   size_t, struct proc *));
+       /*!
+        *  @function vfs_mount
+        *  @abstract Perform filesystem-specific operations required for mounting.
+        *  @discussion Typical operations include setting the mount-specific data with vfs_setfsprivate().
+        *  Note that if a mount call fails, the filesystem must clean up any state it has constructed, because
+        *  vfs-level mount code will not clean it up.
+        *  @param mp Mount structure for the newly mounted filesystem.
+        *  @param devvp Device that the filesystem is mounted from.
+        *  @param data Filesystem-specific data passed down from userspace.
+        *  @param context Context to authenticate for mount.
+        *  @return 0 for success, else an error code.  Once success is returned, the filesystem should be ready to go active;
+        *  VFS will not ask again.
+        */
+       int  (*vfs_mount)(struct mount *mp, vnode_t devvp, user_addr_t data, vfs_context_t context);
+
+       /*!
+        *  @function vfs_start
+        *  @abstract Mark a mount as ready to be used.
+        *  @discussion After receiving this calldown, a filesystem will be hooked into the mount list and should expect
+        *  calls down from the VFS layer.
+        *  @param mp Mount structure being activated.
+        *  @param flags Unused.
+        *  @param context Context to authenticate for mount.
+        *  @return Return value is ignored.
+        */
+       int  (*vfs_start)(struct mount *mp, int flags, vfs_context_t context);
+
+       /*!
+        *  @function vfs_unmount
+        *  @abstract Perform filesystem-specific cleanup as part of unmount.
+        *  @discussion If the unmount downcall succeeds, VFS considers itself authorized to destroy all
+        *  state related to the mount.
+        *  @param mp Mount structure to unmount.
+        *  @param mntflags MNT_FORCE indicates that we wish to unmount even if there are active vnodes.
+        *  @param context Context to authenticate for unmount.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_unmount)(struct mount *mp, int mntflags, vfs_context_t context);
+
+       /*!
+        *  @function vfs_root
+        *  @abstract Get the root vnode of a filesystem.
+        *  @discussion Upon success, should return with an iocount held on the root vnode which the caller will
+        *  drop with vnode_put().
+        *  @param mp Mount for which to get the root.
+        *  @param vpp Destination for root vnode.
+        *  @param context Context to authenticate for getting the root.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_root)(struct mount *mp, struct vnode **vpp, vfs_context_t context);
+
+       /*!
+        *  @function vfs_quotactl
+        *  @abstract Manipulate quotas for a volume.
+        *  @param mp Mount for which to manipulate quotas.
+        *  @param cmds Detailed in "quotactl" manual page.
+        *  @param uid Detailed in "quotactl" manual page.
+        *  @param arg Detailed in "quotactl" manual page.
+        *  @param context Context to authenticate for changing quotas.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_quotactl)(struct mount *mp, int cmds, uid_t uid, caddr_t arg, vfs_context_t context);
+
+       /*!
+        *  @function vfs_getattr
+        *  @abstract Get filesystem attributes.
+        *  @discussion See VFSATTR_RETURN, VFSATTR_ACTIVE, VFSATTR_SET_SUPPORTED, VFSATTR_WANTED macros.
+        *  @param mp Mount for which to get parameters.
+        *  @param vfa Container for specifying which attributes are desired and which attributes the filesystem
+        *  supports, as well as for returning results.
+        *  @param ctx Context to authenticate for getting filesystem attributes.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_getattr)(struct mount *mp, struct vfs_attr *, vfs_context_t context);
+/*     int  (*vfs_statfs)(struct mount *mp, struct vfsstatfs *sbp, vfs_context_t context);*/
+
+       /*!
+        *  @function vfs_sync
+        *  @abstract Flush all filesystem data to backing store.
+        *  @discussion vfs_sync will be called as part of the sync() system call and during unmount.
+        *  @param mp Mountpoint to sync.
+        *  @param waitfor MNT_WAIT: flush synchronously, waiting for all data to be written before returning. MNT_NOWAIT: start I/O but do not wait for it.
+        *  @param ctx Context to authenticate for the sync.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_sync)(struct mount *mp, int waitfor, vfs_context_t context);
+
+       /*!
+        *  @function vfs_vget
+        *  @abstract Get a vnode by file id (inode number).
+        *  @discussion This routine is chiefly used to build paths to vnodes.  Result should be turned with an iocount that the
+        *  caller will drop with vnode_put().
+        *  @param mp Mount against which to look up inode number.
+        *  @param ino File ID for desired file, as found through a readdir.
+        *  @param vpp Destination for vnode.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_vget)(struct mount *mp, ino64_t ino, struct vnode **vpp, vfs_context_t context);
+
+       /*!
+        *  @function vfs_fhtovp
+        *  @abstract Get the vnode corresponding to a file handle.
+        *  @discussion Filesystems can return handles to files which are independent of their (transient) vnode identities.
+        *  vfs_thtovp converts that persistent handle back to a vnode.  The vnode should be returned with an iocount which
+        *  the caller will drop with vnode_put().
+        *  @param mp Mount against which to look up file handle.
+        *  @param fhlen Size of file handle structure, as returned by vfs_vptofh.
+        *  @param fhp Pointer to handle.
+        *  @param vpp Destination for vnode.
+        *  @param ctx Context against which to authenticate the file-handle conversion.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_fhtovp)(struct mount *mp, int fhlen, unsigned char *fhp, struct vnode **vpp,
+           vfs_context_t context);
+
+       /*!
+        *  @function vfs_vptofh
+        *  @abstract Get a persistent handle corresponding to a vnode.
+        *  @param mp Mount against which to convert the vnode to a handle.
+        *  @param fhlen Size of buffer provided for handle; set to size of actual handle returned.
+        *  @param fhp Pointer to buffer in which to place handle data.
+        *  @param ctx Context against which to authenticate the file-handle request.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_vptofh)(struct vnode *vp, int *fhlen, unsigned char *fhp, vfs_context_t context);
+
+       /*!
+        *  @function vfs_init
+        *  @abstract Prepare a filesystem for having instances mounted.
+        *  @discussion This routine is called once, before any particular instance of a filesystem
+        *  is mounted; it allows the filesystem to initialize whatever global data structures
+        *  are shared across all mounts.  If this returns successfully, a filesystem should be ready to have
+        *  instances mounted.
+        *  @param vfsconf Configuration information.  Currently, the only useful data are the filesystem name,
+        *  typenum, and flags.  The flags field will be either 0 or MNT_LOCAL.  Many filesystems ignore this
+        *  parameter.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_init)(struct vfsconf *);
+
+       /*!
+        *  @function vfs_sysctl
+        *  @abstract Broad interface for querying and controlling filesystem.
+        *  @discussion VFS defines VFS_CTL_QUERY as a generic status request which is answered
+        *  with the VQ_* macros in a "struct vfsquery."
+        *  A filesystem may also define implementation-specific commands.  See "man 3 sysctl"
+        *  for the meaning of sysctl parameters.
+        *  @param context Context against which to authenticate command.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_sysctl)(int *, u_int, user_addr_t, size_t *, user_addr_t, size_t, vfs_context_t context);
+
+       /*!
+        *  @function vfs_setattr
+        *  @abstract Set filesystem attributes.
+        *  @discussion The other side of the vfs_getattr coin.  Currently only called to set volume name.
+        *  @param mp Mount on which to set attributes.
+        *  @param vfa VFS attribute structure containing requested attributes to set and their values.  Currently
+        *  will only be called with f_vol_name set.
+        *  @param context Context against which to authenticate attribute change.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_setattr)(struct mount *mp, struct vfs_attr *, vfs_context_t context);
+
+       /*!
+        *  @function vfs_ioctl
+        *  @abstract File system control operations.
+        *  @discussion  Unlike vfs_sysctl, this is specific to a particular volume.
+        *  @param mp The mount to execute the command on.
+        *  @param command Identifier for action to take.  The command used here
+        *  should be in the same namespace as VNOP ioctl commands.
+        *  @param data Pointer to data; this can be an integer constant (of 32 bits
+        *  only) or an address to be read from or written to, depending on "command."
+        *  If it is an address, it is valid and resides in the kernel; callers of
+        *  VFS_IOCTL() are responsible for copying to and from userland.
+        *  @param flags Reserved for future use, set to zero
+        *  @param ctx Context against which to authenticate ioctl request.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_ioctl)(struct mount *mp, u_long command, caddr_t data,
+           int flags, vfs_context_t context);
+
+       /*!
+        *  @function vfs_vget_snapdir
+        *  @abstract Get the vnode for the snapshot directory of a filesystem.
+        *  @discussion Upon success, should return with an iocount held on the root vnode which the caller will
+        *  drop with vnode_put().
+        *  @param mp Mount for which to get the root.
+        *  @param vpp Destination for snapshot directory vnode.
+        *  @param context Context to authenticate for getting the snapshot directory.
+        *  @return 0 for success, else an error code.
+        */
+       int  (*vfs_vget_snapdir)(struct mount *mp, struct vnode **vpp, vfs_context_t context);
+       void *vfs_reserved5;
+       void *vfs_reserved4;
+       void *vfs_reserved3;
+       void *vfs_reserved2;
+       void *vfs_reserved1;

 };
 
 };
 

-#define VFS_MOUNT(MP, PATH, DATA, NDP, P) \
-       (*(MP)->mnt_op->vfs_mount)(MP, PATH, DATA, NDP, P)
-#define VFS_START(MP, FLAGS, P)          (*(MP)->mnt_op->vfs_start)(MP, FLAGS, P)
-#define VFS_UNMOUNT(MP, FORCE, P) (*(MP)->mnt_op->vfs_unmount)(MP, FORCE, P)
-#define VFS_ROOT(MP, VPP)        (*(MP)->mnt_op->vfs_root)(MP, VPP)
-#define VFS_QUOTACTL(MP,C,U,A,P)  (*(MP)->mnt_op->vfs_quotactl)(MP, C, U, A, P)
-#define VFS_STATFS(MP, SBP, P)   (*(MP)->mnt_op->vfs_statfs)(MP, SBP, P)
-#define VFS_SYNC(MP, WAIT, C, P)  (*(MP)->mnt_op->vfs_sync)(MP, WAIT, C, P)
-#define VFS_VGET(MP, INO, VPP)   (*(MP)->mnt_op->vfs_vget)(MP, INO, VPP)
-#define VFS_FHTOVP(MP, FIDP, NAM, VPP, EXFLG, CRED) \
-       (*(MP)->mnt_op->vfs_fhtovp)(MP, FIDP, NAM, VPP, EXFLG, CRED)
-#define        VFS_VPTOFH(VP, FIDP)      (*(VP)->v_mount->mnt_op->vfs_vptofh)(VP, FIDP)
+#ifdef KERNEL

 
 /*
 
 /*

- * Network address lookup element
+ * Commands for vfs_ioctl. While they are encoded the same way as for ioctl(2),
+ * there is no generic interface for them from userspace like ioctl(2).

  */
  */

-struct netcred {
-       struct  radix_node netc_rnodes[2];
-       int     netc_exflags;
-       struct  ucred netc_anon;
+struct fs_snapshot_mount_args {
+       mount_t sm_mp;
+       struct componentname *sm_cnp;
+};
+
+#define VFSIOC_MOUNT_SNAPSHOT  _IOW('V', 1, struct fs_snapshot_mount_args)
+
+struct fs_snapshot_revert_args {
+       struct componentname *sr_cnp;

 };
 };

+#define VFSIOC_REVERT_SNAPSHOT  _IOW('V', 2, struct fs_snapshot_revert_args)
+
+struct fs_snapshot_root_args {
+       struct componentname *sr_cnp;
+};
+#define VFSIOC_ROOT_SNAPSHOT  _IOW('V', 3, struct fs_snapshot_root_args)
+
+#endif /* KERNEL */

 
 /*
 
 /*

- * Network export information
+ * flags passed into vfs_iterate

  */
  */

-struct netexport {
-       struct  netcred ne_defexported;               /* Default export */
-       struct  radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
-};
+#ifdef PRIVATE
+#define VFS_ITERATE_TAIL_FIRST  (1 << 0)
+#define VFS_ITERATE_CB_DROPREF  (1 << 1)        // Callback will drop the iterref
+#endif /* PRIVATE */

 
 /*
 
 /*

- * exported vnode operations
- */
-int    vfs_busy __P((struct mount *, int, struct slock *, struct proc *));
-int    vfs_export __P((struct mount *, struct netexport *,
-           struct export_args *));
-struct netcred *vfs_export_lookup __P((struct mount *, struct netexport *,
-           struct mbuf *));
-void   vfs_getnewfsid __P((struct mount *));
-struct mount *vfs_getvfs __P((fsid_t *));
-int    vfs_mountedon __P((struct vnode *));
-void   vfs_unbusy __P((struct mount *, struct proc *));
-#ifdef __APPLE_API_PRIVATE
-int    vfs_mountroot __P((void));
-int    vfs_rootmountalloc __P((char *, char *, struct mount **));
-void   vfs_unmountall __P((void));
-#endif /* __APPLE_API_PRIVATE */
-extern CIRCLEQ_HEAD(mntlist, mount) mountlist;
-extern struct slock mountlist_slock;
-
-#endif /* __APPLE_API_UNSTABLE */
-#else /* !KERNEL */
+ * return values from callback
+ */
+#define VFS_RETURNED            0       /* done with vnode, reference can be dropped */
+#define VFS_RETURNED_DONE       1       /* done with vnode, reference can be dropped, terminate iteration */
+#define VFS_CLAIMED             2       /* don't drop reference */
+#define VFS_CLAIMED_DONE        3       /* don't drop reference, terminate iteration */
+
+
+__BEGIN_DECLS
+#ifdef BSD_KERNEL_PRIVATE
+extern int VFS_MOUNT(mount_t, vnode_t, user_addr_t, vfs_context_t);
+extern int VFS_START(mount_t, int, vfs_context_t);
+extern int VFS_UNMOUNT(mount_t, int, vfs_context_t);
+extern int VFS_ROOT(mount_t, vnode_t *, vfs_context_t);
+extern int VFS_QUOTACTL(mount_t, int, uid_t, caddr_t, vfs_context_t);
+extern int VFS_GETATTR(mount_t, struct vfs_attr *, vfs_context_t);
+extern int VFS_SETATTR(mount_t, struct vfs_attr *, vfs_context_t);
+extern int VFS_SYNC(mount_t, int, vfs_context_t);
+extern int VFS_VGET(mount_t, ino64_t, vnode_t *, vfs_context_t);
+extern int VFS_FHTOVP(mount_t, int, unsigned char *, vnode_t *, vfs_context_t);
+extern int VFS_VPTOFH(vnode_t, int *, unsigned char *, vfs_context_t);
+extern int VFS_IOCTL(mount_t mp, u_long command, caddr_t data,
+    int flags, vfs_context_t context);
+extern int VFS_VGET_SNAPDIR(mount_t, vnode_t *, vfs_context_t);
+#endif /* BSD_KERNEL_PRIVATE */
+/*
+ * prototypes for exported VFS operations
+ */
+
+/*!
+ *  @function vfs_fsadd
+ *  @abstract Register a filesystem with VFS.
+ *  @discussion Typically called by a filesystem Kernel Extension when it is loaded.
+ *  @param vfe Filesystem information: table of vfs operations, list of vnode operation tables,
+ *  filesystem type number (can be omitted with VFS_TBLNOTYPENUM flag), name, flags.
+ *  @param handle Opaque handle which will be passed to vfs_fsremove.
+ *  @return 0 for success, else an error code.
+ */
+int vfs_fsadd(struct vfs_fsentry *vfe, vfstable_t *handle);
+
+/*!
+ *  @function vfs_fsremove
+ *  @abstract Unregister a filesystem with VFS.
+ *  @discussion Typically called by a filesystem Kernel Extension when it is unloaded.
+ *  @param handle Handle which was returned by vfs_fsadd.
+ *  @return 0 for success, else an error code.
+ */
+int vfs_fsremove(vfstable_t handle);
+
+/*!
+ *  @function vfs_iterate
+ *  @abstract Iterate over all mountpoints with a callback.  Used, for example, by sync().
+ *  @param flags Unused.
+ *  @param callout Function which takes a mount and arbitrary passed-in "arg," and returns one of VFS_RETURNED_DONE or VFS_CLAIMED_DONE: end
+ *  iteration and return success.  VFS_RETURNED or VFS_CLAIMED: continue iterating. Anything else: continue iterating.
+ *  @param arg Arbitrary data to pass to callback.
+ *  @return 0 for success, else an error code.
+ */
+int     vfs_iterate(int flags, int (*callout)(struct mount *, void *), void *arg);
+
+/*!
+ *  @function vfs_init_io_attributes
+ *  @abstract Set I/O attributes on a mountpoint based on device properties.
+ *  @param devvp Block device vnode from which a filesystem is being mounted.
+ *  @param mp Mountpoint whose I/O parameters to initialize.
+ *  @return 0 for success, else an error code.
+ */
+int     vfs_init_io_attributes(vnode_t devvp, mount_t mp);
+
+/*!
+ *  @function vfs_flags
+ *  @abstract Retrieve mount flags.
+ *  @discussion Results will be in the bitwise "OR" of MNT_VISFLAGMASK and MNT_CMDFLAGS.
+ *  @param mp Mount whose flags to grab.
+ *  @return Flags.
+ */
+uint64_t vfs_flags(mount_t mp);
+
+/*!
+ *  @function vfs_setflags
+ *  @abstract Set flags on a mount.
+ *  @discussion Sets mount flags to the bitwise "OR" of their current value and the specified bits. Often
+ *  used by a filesystem as part of the mount process.
+ *  @param mp Mount whose flags to set.
+ *  @param flags Flags to activate.  Must be in the bitwise "OR" of MNT_VISFLAGMASK and MNT_CMDFLAGS.
+ */
+void    vfs_setflags(mount_t mp, uint64_t flags);
+
+/*!
+ *  @function vfs_clearflags
+ *  @abstract Clear flags on a mount.
+ *  @discussion Sets mount flags to the bitwise "AND" of their current value and the complement of the specified bits.
+ *  @param mp Mount whose flags to set.
+ *  @param flags Flags to deactivate.  Must be in the bitwise "OR" of MNT_VISFLAGMASK and MNT_CMDFLAGS.
+ */
+void    vfs_clearflags(mount_t mp, uint64_t flags);
+
+/*!
+ *  @function vfs_issynchronous
+ *  @abstract Determine if writes to a filesystem occur synchronously.
+ *  @param mp Mount to test.
+ *  @return Nonzero if writes occur synchronously, else 0.
+ */
+int     vfs_issynchronous(mount_t mp);
+
+/*!
+ *  @function vfs_iswriteupgrade
+ *  @abstract Determine if a filesystem is mounted read-only but a request has been made to upgrade
+ *  to read-write.
+ *  @param mp Mount to test.
+ *  @return Nonzero if a request has been made to update from read-only to read-write, else 0.
+ */
+int     vfs_iswriteupgrade(mount_t mp);
+
+/*!
+ *  @function vfs_isupdate
+ *  @abstract Determine if a mount update is in progress.
+ *  @param mp Mount to test.
+ *  @return Nonzero if a mount update is in progress, 0 otherwise.
+ */
+int     vfs_isupdate(mount_t mp);
+
+/*!
+ *  @function vfs_isreload
+ *  @abstract Determine if a reload of filesystem data is in progress.  This can only be the case
+ *  for a read-only filesystem; all data is brought in from secondary storage.
+ *  @param mp Mount to test.
+ *  @return Nonzero if a request has been made to reload data, else 0.
+ */
+int     vfs_isreload(mount_t mp);
+
+/*!
+ *  @function vfs_isforce
+ *  @abstract Determine if a forced unmount is in progress.
+ *  @discussion A forced unmount invalidates open files.
+ *  @param mp Mount to test.
+ *  @return Nonzero if a request has been made to forcibly unmount, else 0.
+ */
+int     vfs_isforce(mount_t mp);
+
+/*!
+ *  @function vfs_isunmount
+ *  @abstract Determine if an unmount is in progress.
+ *  @discussion This is an unsynchronized snapshot of the mount state.  It should only be called
+ *  if the mount is known to be valid, e.g. there are known to be live files on that volume.
+ *  @param mp Mount to test.
+ *  @return Nonzero if an unmount is in progress, else zero.
+ */
+int     vfs_isunmount(mount_t mp);
+
+/*!
+ *  @function vfs_isrdonly
+ *  @abstract Determine if a filesystem is mounted read-only.
+ *  @param mp Mount to test.
+ *  @return Nonzero if filesystem is mounted read-only, else 0.
+ */
+int     vfs_isrdonly(mount_t mp);
+
+/*!
+ *  @function vfs_isrdwr
+ *  @abstract Determine if a filesystem is mounted with writes enabled.
+ *  @param mp Mount to test.
+ *  @return Nonzero if filesystem is mounted read-write, else 0.
+ */
+int     vfs_isrdwr(mount_t mp);
+
+/*!
+ *  @function vfs_authopaque
+ *  @abstract Determine if a filesystem's authorization decisions occur remotely.
+ *  @param mp Mount to test.
+ *  @return Nonzero if filesystem authorization is controlled remotely, else 0.
+ */
+int     vfs_authopaque(mount_t mp);
+
+/*!
+ *  @function vfs_authopaqueaccess
+ *  @abstract Check if a filesystem is marked as having reliable remote VNOP_ACCESS support.
+ *  @param mp Mount to test.
+ *  @return Nonzero if VNOP_ACCESS is supported remotely, else 0.
+ */
+int     vfs_authopaqueaccess(mount_t mp);
+
+/*!
+ *  @function vfs_setauthopaque
+ *  @abstract Mark a filesystem as having authorization decisions controlled remotely.
+ *  @param mp Mount to mark.
+ */
+void    vfs_setauthopaque(mount_t mp);
+
+/*!
+ *  @function vfs_setauthopaqueaccess
+ *  @abstract Mark a filesystem as having remote VNOP_ACCESS support.
+ *  @param mp Mount to mark.
+ */
+void    vfs_setauthopaqueaccess(mount_t mp);
+
+/*!
+ *  @function vfs_clearauthopaque
+ *  @abstract Mark a filesystem as not having remote authorization decisions.
+ *  @param mp Mount to mark.
+ */
+void    vfs_clearauthopaque(mount_t mp);
+
+/*!
+ *  @function vfs_clearauthopaque
+ *  @abstract Mark a filesystem as not having remote VNOP_ACCESS support.
+ *  @param mp Mount to mark.
+ */
+void    vfs_clearauthopaqueaccess(mount_t mp);
+
+/*!
+ *  @function vfs_setextendedsecurity
+ *  @abstract Mark a filesystem as supporting security controls beyond POSIX permissions.
+ *  @discussion Specific controls include ACLs, file owner UUIDs, and group UUIDs.
+ *  @param mp Mount to test.
+ */
+void    vfs_setextendedsecurity(mount_t mp);
+
+/*!
+ *  @function vfs_clearextendedsecurity
+ *  @abstract Mark a filesystem as NOT supporting security controls beyond POSIX permissions.
+ *  @discussion Specific controls include ACLs, file owner UUIDs, and group UUIDs.
+ *  @param mp Mount to test.
+ */
+void    vfs_clearextendedsecurity(mount_t mp);
+
+/*!
+ *  @function vfs_setnoswap
+ *  @abstract Mark a filesystem as unable to use swap files.
+ *  @param mp Mount to mark.
+ */
+void    vfs_setnoswap(mount_t mp);
+
+/*!
+ *  @function vfs_clearnoswap
+ *  @abstract Mark a filesystem as capable of using swap files.
+ *  @param mp Mount to mark.
+ */
+void    vfs_clearnoswap(mount_t mp);
+
+/*!
+ *  @function vfs_setlocklocal
+ *  @abstract Mark a filesystem as using VFS-level advisory locking support.
+ *  @discussion Advisory locking operations will not call down to the filesystem if this flag is set.
+ *  @param mp Mount to mark.
+ */
+void    vfs_setlocklocal(mount_t mp);
+
+/*!
+ *  @function vfs_authcache_ttl
+ *  @abstract Determine the time-to-live of cached authorized credentials for files in this filesystem.
+ *  @discussion If a filesystem is set to allow caching credentials, the VFS layer can authorize
+ *  previously-authorized actions from the same vfs_context_t without calling down to the filesystem (though
+ *  it will not deny based on the cache).
+ *  @param mp Mount for which to check cache lifetime.
+ *  @return  Cache lifetime in seconds.  CACHED_RIGHT_INFINITE_TTL indicates that credentials never expire.
+ */
+int     vfs_authcache_ttl(mount_t mp);
+
+/*!
+ *  @function vfs_setauthcache_ttl
+ *  @abstract Enable credential caching and set  time-to-live of cached authorized credentials for files in this filesystem.
+ *  @discussion If a filesystem is set to allow caching credentials, the VFS layer can authorize
+ *  previously-authorized actions from the same vfs_context_t without calling down to the filesystem (though
+ *  it will not deny based on the cache).
+ *  @param mp Mount for which to set cache lifetime.
+ */
+void    vfs_setauthcache_ttl(mount_t mp, int ttl);
+
+/*!
+ *  @function vfs_clearauthcache_ttl
+ *  @abstract Remove time-to-live controls for cached credentials on a filesytem.  Filesystems with remote authorization
+ *  decisions (opaque) will still have KAUTH_VNODE_SEARCH rights cached for a default of CACHED_LOOKUP_RIGHT_TTL seconds.
+ *  @param mp Mount for which to clear cache lifetime.
+ */
+void    vfs_clearauthcache_ttl(mount_t mp);
+
+/*
+ * return value from vfs_cachedrights_ttl if
+ * neither MNTK_AUTH_OPAQUE | MNTK_AUTH_CACHE_TTL
+ * is set in mnt_kern_flag.. it indicates
+ * that no TTL is being applied to the vnode rights cache
+ */
+#define CACHED_RIGHT_INFINITE_TTL       ~0
+
+/*!
+ *  @function vfs_maxsymlen
+ *  @abstract Get the maximum length of a symbolic link on a filesystem.
+ *  @param mp Mount from which to get symlink length cap.
+ *  @return Max symlink length.
+ */
+uint32_t vfs_maxsymlen(mount_t mp);
+
+/*!
+ *  @function vfs_setmaxsymlen
+ *  @abstract Set the maximum length of a symbolic link on a filesystem.
+ *  @param mp Mount on which to set symlink length cap.
+ *  @param symlen Length to set.
+ */
+void    vfs_setmaxsymlen(mount_t mp, uint32_t symlen);
+
+/*!
+ *  @function vfs_fsprivate
+ *  @abstract Get filesystem-private mount data.
+ *  @discussion A filesystem generally has an internal mount structure which it attaches to the VFS-level mount structure
+ *  as part of the mounting process.
+ *  @param mp Mount for which to get private data.
+ *  @return Private data.
+ */
+void *  vfs_fsprivate(mount_t mp);
+
+/*!
+ *  @function vfs_setfsprivate
+ *  @abstract Set filesystem-private mount data.
+ *  @discussion A filesystem generally has an internal mount structure which it attaches to the VFS-level mount structure
+ *  as part of the mounting process.
+ *  @param mp Mount for which to set private data.
+ */
+void    vfs_setfsprivate(mount_t mp, void *mntdata);
+
+/*!
+ *  @function vfs_statfs
+ *  @abstract Get information about filesystem status.
+ *  @discussion Each filesystem has a struct vfsstatfs associated with it which is updated as events occur; this function
+ *  returns a pointer to it.  Note that the data in the structure will continue to change over time and also that it may
+ *  be quite stale if vfs_update_vfsstat has not been called recently.
+ *  @param mp Mount for which to get vfsstatfs pointer.
+ *  @return Pointer to vfsstatfs.
+ */
+struct vfsstatfs *      vfs_statfs(mount_t mp);
+#define VFS_USER_EVENT          0
+#define VFS_KERNEL_EVENT        1
+
+/*!
+ *  @function vfs_update_vfsstat
+ *  @abstract Update cached filesystem status information in the VFS mount structure.
+ *  @discussion Each filesystem has a struct vfsstatfs associated with it which is updated as events occur; this function
+ *  updates it so that the structure pointer returned by vfs_statfs() returns a pointer to fairly recent data.
+ *  @param mp Mount for which to update cached status information.
+ *  @param ctx Context to authenticate against for call down to filesystem.
+ *  @param eventtype VFS_USER_EVENT: need for update is driven by user-level request; perform additional authentication.
+ *  VFS_KERNEL_EVENT: need for update is driven by in-kernel events.  Skip extra authentication.
+ *  @return 0 for success, or an error code for authentication failure or problem with call to filesystem to
+ *  request information.
+ */
+int     vfs_update_vfsstat(mount_t mp, vfs_context_t ctx, int eventtype);
+
+/*!
+ *  @function vfs_typenum
+ *  @abstract Get (archaic) filesystem type number.
+ *  @discussion Filesystem type numbers are an old construct; most filesystems just get a number assigned based on
+ *  the order in which they are registered with the system.
+ *  @param mp Mount for which to get type number.
+ *  @return Type number.
+ */
+int     vfs_typenum(mount_t mp);
+
+/*!
+ *  @function vfs_name
+ *  @abstract Copy filesystem name into a buffer.
+ *  @discussion Get filesystem name; this refers to the filesystem type of which a mount is an instantiation,
+ *  rather than a name specific to the mountpoint.
+ *  @param mp Mount for which to get name.
+ *  @param buffer Destination for name; length should be at least MFSNAMELEN.
+ */
+void    vfs_name(mount_t mp, char *buffer);
+
+/*!
+ *  @function vfs_devblocksize
+ *  @abstract Get the block size of the device underlying a mount.
+ *  @param mp Mount for which to get block size.
+ *  @return Block size.
+ */
+int     vfs_devblocksize(mount_t mp);
+
+/*!
+ *  @function vfs_ioattr
+ *  @abstract Get I/O attributes associated with a mounpoint.
+ *  @param mp Mount for which to get attributes.  If NULL, system defaults are filled into ioattrp.
+ *  @param ioattrp Destination for results.
+ */
+void    vfs_ioattr(mount_t mp, struct vfsioattr *ioattrp);
+
+/*!
+ *  @function vfs_setioattr
+ *  @abstract Set I/O attributes associated with a mounpoint.
+ *  @param mp Mount for which to set attributes.
+ *  @param ioattrp Structure containing I/O parameters; all fields must be filled in.
+ */
+void    vfs_setioattr(mount_t mp, struct vfsioattr *ioattrp);
+
+/*!
+ *  @function vfs_64bitready
+ *  @abstract Check if the filesystem associated with a mountpoint is marked ready for interaction with 64-bit user processes.
+ *  @param mp Mount to test.
+ *  @return Nonzero if filesystem is ready for 64-bit; 0 otherwise.
+ */
+int     vfs_64bitready(mount_t mp);
+
+
+#define LK_NOWAIT 1
+/*!
+ *  @function vfs_busy
+ *  @abstract "Busy" a mountpoint.
+ *  @discussion vfs_busy() will "busy" a mountpoint, preventing unmounts from taking off, by taking its reader-writer lock
+ *  in a shared manner.  If a mount is dead,
+ *  it will fail; if an unmount is in progress, depending on flags, it will either fail immediately or block
+ *  until the unmount completes (then failing if the unmount has succeeded, or potentially succeeding if unmounting failed).
+ *  A successful vfs_busy() must be followed by a vfs_unbusy() to release the lock on the mount.
+ *  @param mp Mount to busy.
+ *  @param flags LK_NOWAIT: fail with ENOENT if an unmount is in progress.
+ *  @return 0 for success, with a lock held; an error code otherwise, with no lock held.
+ */
+int     vfs_busy(mount_t mp, int flags);
+
+/*!
+ *  @function vfs_unbusy
+ *  @abstract "Unbusy" a mountpoint by releasing its read-write lock.
+ *  @discussion A successful vfs_busy() must be followed by a vfs_unbusy() to release the lock on the mount.
+ *  @param mp Mount to unbusy.
+ */
+void    vfs_unbusy(mount_t mp);
+
+/*!
+ *  @function vfs_getnewfsid
+ *  @abstract Generate a unique filesystem ID for a mount and store it in the mount structure.
+ *  @discussion Filesystem IDs are returned as part of "struct statfs."  This function is typically
+ *  called as part of file-system specific mount code (i.e. through VFS_MOUNT).
+ *  @param mp Mount to set an ID for.
+ */
+void    vfs_getnewfsid(struct mount *mp);
+
+/*!
+ *  @function vfs_getvfs
+ *  @abstract Given a filesystem ID, look up a mount structure.
+ *  @param fsid Filesystem ID to look up.
+ *  @return Mountpoint if found, else NULL.  Note unmounting mountpoints can be returned.
+ */
+mount_t vfs_getvfs(fsid_t *fsid);
+
+/*!
+ *  @function vfs_mountedon
+ *  @abstract Check whether a given block device has a filesystem mounted on it.
+ *  @discussion Note that this is NOT a check for a covered vnode (the directory upon which
+ *  a filesystem is mounted)--it is a test for whether a block device is being used as the source
+ *  of a filesystem.  Note that a block device marked as being mounted on cannot be opened.
+ *  @param vp The vnode to test.
+ *  @return EBUSY if vnode is indeed the source of a filesystem; 0 if it is not.
+ */
+int     vfs_mountedon(struct vnode *vp);
+
+/*!
+ *  @function vfs_unmountbyfsid
+ *  @abstract Find a filesystem by ID and unmount it.
+ *  @param fsid ID of filesystem to unmount, as found through (for example) statfs.
+ *  @param flags MNT_FORCE: forcibly invalidate files open on the mount (though in-flight I/O operations
+ *  will be allowed to complete).
+ *  @param ctx Context against which to authenticate unmount operation.
+ *  @return 0 for succcess, nonero for failure.
+ */
+int     vfs_unmountbyfsid(fsid_t *fsid, int flags, vfs_context_t ctx);
+
+/*!
+ *  @function vfs_event_signal
+ *  @abstract Post a kqueue-style event on a filesystem (EVFILT_FS).
+ *  @param fsid Unused.
+ *  @param event Events to post.
+ *  @param data Unused.
+ */
+void    vfs_event_signal(fsid_t *fsid, u_int32_t event, intptr_t data);
+
+/*!
+ *  @function vfs_event_init
+ *  @abstract This function should not be called by kexts.
+ */
+void    vfs_event_init(void); /* XXX We should not export this */
+
+/*!
+ *  @function vfs_set_root_unmount_cleanly
+ *  @abstract This function should be called by the root file system
+ *  when it is being mounted if the file system state is consistent.
+ */
+void vfs_set_root_unmounted_cleanly(void);
+
+#ifdef KERNEL_PRIVATE
+int     vfs_getbyid(fsid_t *fsid, ino64_t ino, vnode_t *vpp, vfs_context_t ctx);
+int     vfs_getattr(mount_t mp, struct vfs_attr *vfa, vfs_context_t ctx);
+int     vfs_setattr(mount_t mp, struct vfs_attr *vfa, vfs_context_t ctx);
+int     vfs_extendedsecurity(mount_t);
+mount_t vfs_getvfs_by_mntonname(char *);
+vnode_t vfs_vnodecovered(mount_t mp); /* Returns vnode with an iocount that must be released with vnode_put() */
+vnode_t vfs_devvp(mount_t mp); /* Please see block comment with implementation */
+int vfs_nativexattrs(mount_t mp);  /* whether or not the FS supports EAs natively */
+void *  vfs_mntlabel(mount_t mp); /* Safe to cast to "struct label*"; returns "void*" to limit dependence of mount.h on security headers.  */
+void    vfs_setcompoundopen(mount_t mp);
+uint64_t vfs_throttle_mask(mount_t mp);
+int vfs_isswapmount(mount_t mp);
+
+struct vnode_trigger_info;
+
+/*!
+ *  @function vfs_addtrigger
+ *  @abstract Create an "external" trigger vnode: look up a vnode and mark it as
+ *  a trigger.  Can only safely be called in the context of a callback set by
+ *  vfs_settriggercallback().  May only be used on a file which is not already
+ *  marked as a trigger.
+ *  @param relpath Path relative to root of mountpoint at which to mark trigger.
+ *  @param vtip Information about trigger; analogous to "vnode_trigger_param"
+ *       argument to vnode_create.
+ *  @param ctx Authorization context.
+ */
+int     vfs_addtrigger(mount_t mp, const char *relpath, struct vnode_trigger_info *vtip, vfs_context_t ctx);
+
+
+/*!
+ *  @enum vfs_trigger_callback_op_t
+ *  @abstract Operation to perform after an attempted unmount (successful or otherwise).
+ *  @constant VTC_REPLACE Unmount failed: attempt to replace triggers.  Only valid
+ *       VFS operation to perform in this context is vfs_addtrigger().
+ *  @constant VTC_RELEASE Unmount succeeded: release external triggering context.
+ */
+typedef enum {
+       VTC_REPLACE,
+       VTC_RELEASE
+} vfs_trigger_callback_op_t;
+
+/*!
+ *  @typedef vfs_trigger_callback_t
+ *  @abstract Callback to be passed to vfs_settriggercallback() and invoked from
+ *       unmount context.
+ *  @param mp Mountpoint on which unmount is occurring.
+ *  @param op Operation (see vfs_trigger_callback_op_t)
+ *  @param data Context passed to vfs_settriggercallback()
+ *  @param ctx Authorization context in which unmount is occurring.
+ */
+typedef void vfs_trigger_callback_t(mount_t mp, vfs_trigger_callback_op_t op, void *data, vfs_context_t ctx);
+
+/*!
+ *  @function vfs_settriggercallback
+ *  @abstract Install a callback to be called after unmount attempts on a volume,
+ *  to restore triggers for failed unmounts and release state for successful ones.
+ *  @discussion Installs a callback which will be called in two situations: a
+ *  failed unmount where vnodes may have been reclaimed and a successful unmount.
+ *  Gives an external trigger-marking entity an opportunity to replace triggers
+ *  which may have been reclaimed.  The callback can only be installed (not
+ *  cleared), and only one callback can be installed.  The callback will be called
+ *  with a read-write lock held on the mount point; in the VTC_REPLACE case, the
+ *  <em>only</em> valid VFS operation to perform in the context of the callback is
+ *  vfs_addtrigger() on the mountpoint in question.  This rwlock is held in order
+ *  to attempt to provide some modicum of coverage from lookups which might find
+ *  missing trigger vnodes and receive spurious ENOENTs.  Note that this
+ *  protection is incomplete--current working directories, or traversals up into a
+ *  volume via ".." may still find missing triggers.  As of this writing, no
+ *  serialization mechanism exists to do better than this.
+ *  When the "op" is VTC_RELEASE, the mountpoint is going away, and the only valid
+ *  VFS operation is to free the  private data pointer if needed.  The callback
+ *  will be called immediately, with VTC_REPLACE, from vfs_settriggercallback(),
+ *  if installation is successful.
+ *  @param fsid FSID for filesystem in question.
+ *  @param vtc Callback pointer.
+ *  @param data Context pointer to be passed to callback.
+ *  @param flags Currently unused.
+ *  @param ctx Authorization context.
+ *  @return 0 for success.  EBUSY if a trigger has already been installed.
+ */
+int     vfs_settriggercallback(fsid_t *fsid, vfs_trigger_callback_t vtc, void *data, uint32_t flags, vfs_context_t ctx);
+
+/* tags a volume as not supporting extended readdir for NFS exports */
+void mount_set_noreaddirext(mount_t);
+
+#endif  /* KERNEL_PRIVATE */
+__END_DECLS
+
+#endif /* KERNEL */
+
+#ifndef KERNEL
+
+/*
+ * Generic file handle
+ */
+#define NFS_MAX_FH_SIZE         NFSV4_MAX_FH_SIZE
+#define NFSV4_MAX_FH_SIZE       128
+#define NFSV3_MAX_FH_SIZE       64
+#define NFSV2_MAX_FH_SIZE       32
+struct fhandle {
+       unsigned int    fh_len;                         /* length of file handle */
+       unsigned char   fh_data[NFS_MAX_FH_SIZE];       /* file handle value */
+};
+typedef struct fhandle  fhandle_t;

 
 

-#include <sys/cdefs.h>

 
 __BEGIN_DECLS
 
 __BEGIN_DECLS

-int    fstatfs __P((int, struct statfs *));
-int    getfh __P((const char *, fhandle_t *));
-int    getfsstat __P((struct statfs *, long, int));
-int    getmntinfo __P((struct statfs **, int));
-int    mount __P((const char *, const char *, int, void *));
-int    statfs __P((const char *, struct statfs *));
-int    unmount __P((const char *, int));
-int    getvfsbyname __P((const char *, struct vfsconf *));
+int     fhopen(const struct fhandle *, int);
+int     fstatfs(int, struct statfs *) __DARWIN_INODE64(fstatfs);
+#if !__DARWIN_ONLY_64_BIT_INO_T
+int     fstatfs64(int, struct statfs64 *) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_5, __MAC_10_6, __IPHONE_NA, __IPHONE_NA);
+#endif /* !__DARWIN_ONLY_64_BIT_INO_T */
+int     getfh(const char *, fhandle_t *);
+int     getfsstat(struct statfs *, int, int) __DARWIN_INODE64(getfsstat);
+#if !__DARWIN_ONLY_64_BIT_INO_T
+int     getfsstat64(struct statfs64 *, int, int) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_5, __MAC_10_6, __IPHONE_NA, __IPHONE_NA);
+#endif /* !__DARWIN_ONLY_64_BIT_INO_T */
+int     getmntinfo(struct statfs **, int) __DARWIN_INODE64(getmntinfo);
+int     getmntinfo_r_np(struct statfs **, int) __DARWIN_INODE64(getmntinfo_r_np)
+__OSX_AVAILABLE(10.13) __IOS_AVAILABLE(11.0)
+__TVOS_AVAILABLE(11.0) __WATCHOS_AVAILABLE(4.0);
+#if !__DARWIN_ONLY_64_BIT_INO_T
+int     getmntinfo64(struct statfs64 **, int) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_5, __MAC_10_6, __IPHONE_NA, __IPHONE_NA);
+#endif /* !__DARWIN_ONLY_64_BIT_INO_T */
+int     mount(const char *, const char *, int, void *);
+int     fmount(const char *, int, int, void *) __OSX_AVAILABLE(10.13) __IOS_AVAILABLE(11.0) __TVOS_AVAILABLE(11.0) __WATCHOS_AVAILABLE(4.0);
+int     statfs(const char *, struct statfs *) __DARWIN_INODE64(statfs);
+#if !__DARWIN_ONLY_64_BIT_INO_T
+int     statfs64(const char *, struct statfs64 *) __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_10_5, __MAC_10_6, __IPHONE_NA, __IPHONE_NA);
+#endif /* !__DARWIN_ONLY_64_BIT_INO_T */
+int     unmount(const char *, int);
+int     getvfsbyname(const char *, struct vfsconf *);

 __END_DECLS
 
 #endif /* KERNEL */
 __END_DECLS
 
 #endif /* KERNEL */