xnu-1504.9.17.tar.gz

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

diff --git a/bsd/sys/mount_internal.h b/bsd/sys/mount_internal.h
index f91ca7273726e72b65e305f3e63fae75f7f225ab..d36e8ea744593d58b64c7aad69f9b0a56bd61ebf 100644 (file)
--- a/bsd/sys/mount_internal.h
+++ b/bsd/sys/mount_internal.h
@@ -1,31 +1,29 @@
 /*
 /*

- * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 

- * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
+ * 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. 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.

  * 
  * 

- * 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.  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, 
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
- * Please see the License for the specific language governing rights and 
+ * 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,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * 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.
  * limitations under the License.

- *
- * @APPLE_LICENSE_OSREFERENCE_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 */
 /*


@@ -62,6 +60,12 @@
  *
  *     @(#)mount.h     8.21 (Berkeley) 5/20/95
  */
  *
  *     @(#)mount.h     8.21 (Berkeley) 5/20/95
  */

+/*
+ * NOTICE: This file was modified by McAfee Research in 2004 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_INTERNAL_H_
 #define        _SYS_MOUNT_INTERNAL_H_
 
 #ifndef _SYS_MOUNT_INTERNAL_H_
 #define        _SYS_MOUNT_INTERNAL_H_


@@ -81,6 +85,17 @@
 #include <sys/mount.h>
 #include <sys/cdefs.h>
 
 #include <sys/mount.h>
 #include <sys/cdefs.h>
 

+struct label;
+
+#if defined(__i386__) || defined(__x86_64__)
+typedef uint64_t  pending_io_t;
+#define INCR_PENDING_IO(a, b) OSAddAtomic64((int64_t)(a), (int64_t *)&(b));
+#else
+typedef uint32_t  pending_io_t;
+#define INCR_PENDING_IO(a, b) OSAddAtomic((int32_t)(a), (int32_t *)&(b));
+#endif
+
+

 /*
  * Structure per mounted file system.  Each mounted file system has an
  * array of operations and an instance record.  The file systems are
 /*
  * Structure per mounted file system.  Each mounted file system has an
  * array of operations and an instance record.  The file systems are


@@ -98,30 +113,101 @@ struct mount {
        struct vnodelst mnt_vnodelist;          /* list of vnodes this mount */
        struct vnodelst mnt_workerqueue;                /* list of vnodes this mount */
        struct vnodelst mnt_newvnodes;          /* list of vnodes this mount */
        struct vnodelst mnt_vnodelist;          /* list of vnodes this mount */
        struct vnodelst mnt_workerqueue;                /* list of vnodes this mount */
        struct vnodelst mnt_newvnodes;          /* list of vnodes this mount */

-       int             mnt_flag;               /* flags */
-       int             mnt_kern_flag;          /* kernel only flags */
-       int             mnt_lflag;                      /* mount life cycle flags */
-       int             mnt_maxsymlinklen;      /* max size of short symlink */
+       uint32_t                mnt_flag;               /* flags */
+       uint32_t                mnt_kern_flag;          /* kernel only flags */
+       uint32_t                mnt_lflag;                      /* mount life cycle flags */
+       uint32_t                mnt_maxsymlinklen;      /* max size of short symlink */

        struct vfsstatfs        mnt_vfsstat;            /* cache of filesystem stats */
        qaddr_t         mnt_data;               /* private data */
        /* Cached values of the IO constraints for the device */
        struct vfsstatfs        mnt_vfsstat;            /* 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_int32_t       mnt_segreadcnt;         /* Max. segment count for read */
-       u_int32_t       mnt_segwritecnt;        /* Max. segment count for write */
-       u_int32_t       mnt_maxsegreadsize;     /* Max. segment read size  */
-       u_int32_t       mnt_maxsegwritesize;    /* Max. segment write size */
-       u_int32_t       mnt_devblocksize;       /* the underlying device block size */
+       uint32_t        mnt_maxreadcnt;         /* Max. byte count for read */
+       uint32_t        mnt_maxwritecnt;        /* Max. byte count for write */
+       uint32_t        mnt_segreadcnt;         /* Max. segment count for read */
+       uint32_t        mnt_segwritecnt;        /* Max. segment count for write */
+       uint32_t        mnt_maxsegreadsize;     /* Max. segment read size  */
+       uint32_t        mnt_maxsegwritesize;    /* Max. segment write size */
+       uint32_t        mnt_alignmentmask;      /* Mask of bits that aren't addressable via DMA */
+       uint32_t        mnt_devblocksize;       /* the underlying device block size */
+       uint32_t        mnt_ioqueue_depth;      /* the maxiumum number of commands a device can accept */
+        uint32_t       mnt_ioscale;            /* scale the various throttles/limits imposed on the amount of I/O in flight */
+       uint32_t        mnt_ioflags;            /* flags for  underlying device */
+       pending_io_t    mnt_pending_write_size; /* byte count of pending writes */
+       pending_io_t    mnt_pending_read_size;  /* byte count of pending reads */
+

        lck_rw_t        mnt_rwlock;             /* mutex readwrite lock */
        lck_rw_t        mnt_rwlock;             /* mutex readwrite lock */

-        lck_mtx_t      mnt_renamelock;         /* mutex that serializes renames that change shape of tree */
+       lck_mtx_t       mnt_renamelock;         /* mutex that serializes renames that change shape of tree */

        vnode_t         mnt_devvp;              /* the device mounted on for local file systems */
        vnode_t         mnt_devvp;              /* the device mounted on for local file systems */

+       uint32_t        mnt_devbsdunit;         /* the BSD unit number of the device */
+       void            *mnt_throttle_info;     /* used by the throttle code */

        int32_t         mnt_crossref;           /* refernces to cover lookups  crossing into mp */
        int32_t         mnt_iterref;            /* refernces to cover iterations; drained makes it -ve  */
  
        /* XXX 3762912 hack to support HFS filesystem 'owner' */
        uid_t           mnt_fsowner;
        gid_t           mnt_fsgroup;
        int32_t         mnt_crossref;           /* refernces to cover lookups  crossing into mp */
        int32_t         mnt_iterref;            /* refernces to cover iterations; drained makes it -ve  */
  
        /* XXX 3762912 hack to support HFS filesystem 'owner' */
        uid_t           mnt_fsowner;
        gid_t           mnt_fsgroup;

+
+       struct label    *mnt_mntlabel;          /* MAC mount label */
+       struct label    *mnt_fslabel;           /* MAC default fs label */
+
+       /*
+        * cache the rootvp of the last mount point
+        * in the chain in the mount struct pointed
+        * to by the vnode sitting in '/'
+        * this cache is used to shortcircuit the
+        * mount chain traversal and allows us
+        * to traverse to the true underlying rootvp
+        * in 1 easy step inside of 'cache_lookup_path'
+        *
+        * make sure to validate against the cached vid
+        * in case the rootvp gets stolen away since
+        * we don't take an explicit long term reference
+        * on it when we mount it
+        */
+       vnode_t         mnt_realrootvp;
+       uint32_t        mnt_realrootvp_vid;
+       /*
+        * bumped each time a mount or unmount
+        * occurs... its used to invalidate
+        * 'mnt_realrootvp' from the cache
+        */
+       uint32_t             mnt_generation;
+        /*
+        * if 'MNTK_AUTH_CACHE_TIMEOUT' is 
+        * set, then 'mnt_authcache_ttl' is
+        * the time-to-live for the per-vnode authentication cache
+        * on this mount... if zero, no cache is maintained...
+        * if 'MNTK_AUTH_CACHE_TIMEOUT' isn't set, its the
+        * time-to-live for the cached lookup right for
+        * volumes marked 'MNTK_AUTH_OPAQUE'.
+        */
+       int             mnt_authcache_ttl;
+       /*
+        * The proc structure pointer and process ID form a
+        * sufficiently unique duple identifying the process
+        * hosting this mount point. Set by vfs_markdependency()
+        * and utilized in new_vnode() to avoid reclaiming vnodes
+        * with this dependency (radar 5192010).
+        */
+       pid_t           mnt_dependent_pid;
+       void            *mnt_dependent_process;

 };
 };

+
+/*
+ * default number of seconds to keep cached lookup
+ * rights valid on mounts marked MNTK_AUTH_OPAQUE
+ */
+#define CACHED_LOOKUP_RIGHT_TTL                2
+
+/*
+ * ioflags
+ */
+#define MNT_IOFLAGS_FUA_SUPPORTED      0x00000001
+
+/*
+ * ioqueue depth for devices that don't report one
+ */
+#define MNT_DEFAULT_IOQUEUE_DEPTH      32
+

   
 /* XXX 3762912 hack to support HFS filesystem 'owner' */
 #define vfs_setowner(_mp, _uid, _gid)  do {(_mp)->mnt_fsowner = (_uid); (_mp)->mnt_fsgroup = (_gid); } while (0)
   
 /* XXX 3762912 hack to support HFS filesystem 'owner' */
 #define vfs_setowner(_mp, _uid, _gid)  do {(_mp)->mnt_fsowner = (_uid); (_mp)->mnt_fsgroup = (_gid); } while (0)


@@ -141,9 +227,19 @@ extern struct mount * dead_mountp;
  *             because the bits here were broken out from the high bits
  *             of the mount flags.
  */
  *             because the bits here were broken out from the high bits
  *             of the mount flags.
  */

+#ifdef CONFIG_IMGSRC_ACCESS
+#define MNTK_HAS_MOVED         0x00002000
+#define MNTK_BACKS_ROOT                0x00004000
+#endif /* CONFIG_IMGSRC_ACCESS */
+#define MNTK_AUTH_CACHE_TTL    0x00008000      /* rights cache has TTL - TTL of 0 disables cache */
+#define        MNTK_PATH_FROM_ID       0x00010000      /* mounted file system supports id-to-path lookups */
+#define        MNTK_UNMOUNT_PREFLIGHT  0x00020000      /* mounted file system wants preflight check during unmount */
+#define        MNTK_NAMED_STREAMS      0x00040000      /* mounted file system supports Named Streams VNOPs */
+#define        MNTK_EXTENDED_ATTRS     0x00080000      /* mounted file system supports Extended Attributes VNOPs */

 #define        MNTK_LOCK_LOCAL         0x00100000      /* advisory locking is done above the VFS itself */
 #define MNTK_VIRTUALDEV        0x00200000      /* mounted on a virtual device i.e. a disk image */
 #define MNTK_ROOTDEV           0x00400000      /* this filesystem resides on the same device as the root */
 #define        MNTK_LOCK_LOCAL         0x00100000      /* advisory locking is done above the VFS itself */
 #define MNTK_VIRTUALDEV        0x00200000      /* mounted on a virtual device i.e. a disk image */
 #define MNTK_ROOTDEV           0x00400000      /* this filesystem resides on the same device as the root */

+#define MNTK_SSD               0x00800000      /* underlying device is of the solid state variety */

 #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 */
 #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 */


@@ -169,7 +265,9 @@ extern struct mount * dead_mountp;
 /*
  * Generic file handle
  */
 /*
  * Generic file handle
  */

-#define        NFS_MAX_FH_SIZE         64
+#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 {
        int             fh_len;                         /* length of file handle */
 #define        NFSV2_MAX_FH_SIZE       32
 struct fhandle {
        int             fh_len;                         /* length of file handle */


@@ -185,7 +283,6 @@ typedef struct fhandle      fhandle_t;
  * mount time to identify the requested filesystem.
  */
 struct vfstable {
  * mount time to identify the requested filesystem.
  */
 struct vfstable {

-/* THE FOLLOWING SHOULD KEEP THE SAME FOR user compat with sysctl */

        struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
        char    vfc_name[MFSNAMELEN];   /* filesystem type name */
        int     vfc_typenum;            /* historic filesystem type number */
        struct  vfsops *vfc_vfsops;     /* filesystem operations vector */
        char    vfc_name[MFSNAMELEN];   /* filesystem type name */
        int     vfc_typenum;            /* historic filesystem type number */


@@ -193,18 +290,27 @@ struct vfstable {
        int     vfc_flags;              /* permanent flags */
        int     (*vfc_mountroot)(mount_t, vnode_t, vfs_context_t);      /* if != NULL, routine to mount root */
        struct  vfstable *vfc_next;     /* next in list */
        int     vfc_flags;              /* permanent flags */
        int     (*vfc_mountroot)(mount_t, vnode_t, vfs_context_t);      /* if != NULL, routine to mount root */
        struct  vfstable *vfc_next;     /* next in list */

-/* Till the above we SHOULD KEEP THE SAME FOR user compat with sysctl */
-       int         vfc_threadsafe;     /* FS is thread & premeption safe */
-       lck_mtx_t   vfc_lock;           /* for non-threaded file systems */
+       int32_t vfc_reserved1;
+       int32_t vfc_reserved2;

        int             vfc_vfsflags;   /* for optional types */
        void *          vfc_descptr;    /* desc table allocated address */
        int                     vfc_descsize;   /* size allocated for desc table */
        int             vfc_vfsflags;   /* for optional types */
        void *          vfc_descptr;    /* desc table allocated address */
        int                     vfc_descsize;   /* size allocated for desc table */

-       int             vfc_64bitready; /* The file system is ready for 64bit */

 };
 
 };
 

-#define VFC_VFSLOCALARGS       0x02
-#define        VFC_VFSGENERICARGS      0x04
-#define        VFC_VFSNATIVEXATTR      0x10
+/* vfc_vfsflags: */
+#define VFC_VFSLOCALARGS       0x002
+#define        VFC_VFSGENERICARGS      0x004
+#define        VFC_VFSNATIVEXATTR      0x010
+#define        VFC_VFSDIRLINKS         0x020
+#define        VFC_VFSPREFLIGHT        0x040
+#define        VFC_VFSREADDIR_EXTENDED 0x080
+#define        VFC_VFS64BITREADY       0x100
+#ifndef __LP64__
+#define        VFC_VFSTHREADSAFE       0x200
+#endif /* __LP64__ */
+#define        VFC_VFSNOMACLABEL       0x1000
+#define        VFC_VFSVNOP_PAGEINV2    0x2000
+#define        VFC_VFSVNOP_PAGEOUTV2   0x4000

 
 
 extern int maxvfsconf;         /* highest defined filesystem type */
 
 
 extern int maxvfsconf;         /* highest defined filesystem type */


@@ -231,79 +337,110 @@ struct vfsmount_args {
 
 
 /*
 
 
 /*

- * LP64 version of statfs structure.
+ * LP64 *user* version of statfs structure.

  * NOTE - must be kept in sync with struct statfs in mount.h
  */
  * NOTE - must be kept in sync with struct statfs in mount.h
  */

-#if __DARWIN_ALIGN_NATURAL
-#pragma options align=natural
-#endif
+struct user64_statfs {
+       short           f_otype;                /* TEMPORARY SHADOW COPY OF f_type */
+       short           f_oflags;               /* TEMPORARY SHADOW COPY OF f_flags */
+       user64_long_t   f_bsize;                /* fundamental file system block size */
+       user64_long_t   f_iosize;               /* optimal transfer block size */
+       user64_long_t   f_blocks;               /* total data blocks in file system */
+       user64_long_t   f_bfree;                /* free blocks in fs */
+       user64_long_t   f_bavail;               /* free blocks avail to non-superuser */
+       user64_long_t   f_files;                /* total file nodes in file system */
+       user64_long_t   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 */
+    user64_long_t      f_flags;                /* copy of mount exported flags */
+       user64_long_t 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 */
+       user64_long_t   f_reserved4[4]; /* For future use */
+};

 
 

-struct user_statfs {
+/*
+ * ILP32 *user* version of statfs structure.
+ * NOTE - must be kept in sync with struct statfs in mount.h
+ */
+struct user32_statfs {

        short           f_otype;                /* TEMPORARY SHADOW COPY OF f_type */
        short           f_oflags;               /* TEMPORARY SHADOW COPY OF f_flags */
        short           f_otype;                /* TEMPORARY SHADOW COPY OF f_type */
        short           f_oflags;               /* TEMPORARY SHADOW COPY OF f_flags */

-       user_long_t     f_bsize;                /* fundamental file system block size */
-       user_long_t     f_iosize;               /* optimal transfer block size */
-       user_long_t     f_blocks;               /* total data blocks in file system */
-       user_long_t     f_bfree;                /* free blocks in fs */
-       user_long_t     f_bavail;               /* free blocks avail to non-superuser */
-       user_long_t     f_files;                /* total file nodes in file system */
-       user_long_t     f_ffree;                /* free file nodes in fs */
+       user32_long_t   f_bsize;                /* fundamental file system block size */
+       user32_long_t   f_iosize;               /* optimal transfer block size */
+       user32_long_t   f_blocks;               /* total data blocks in file system */
+       user32_long_t   f_bfree;                /* free blocks in fs */
+       user32_long_t   f_bavail;               /* free blocks avail to non-superuser */
+       user32_long_t   f_files;                /* total file nodes in file system */
+       user32_long_t   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 */
        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 */

-    user_long_t        f_flags;                /* copy of mount exported flags */
-       user_long_t f_reserved2[2];     /* reserved for future use */
+    user32_long_t      f_flags;                /* copy of mount exported flags */
+       user32_long_t 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_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 */
-       user_long_t     f_reserved4[0]; /* For future use */
-#else

        char            f_reserved3;    /* For alignment */
        char            f_reserved3;    /* For alignment */

-       user_long_t     f_reserved4[4]; /* For future use */
-#endif
+       user32_long_t   f_reserved4[4]; /* For future use */

 };
 
 };
 

-#if __DARWIN_ALIGN_NATURAL
-#pragma options align=reset
-#endif
+/*
+ * throttle I/Os are affected only by normal I/Os happening on the same bsd device node.  For example, disk1s3 and
+ * disk1s5 are the same device node, while disk1s3 and disk2 are not (although disk2 might be a mounted disk image file
+ * and the disk image file resides on a partition in disk1).  The following constant defines the maximum number of
+ * different bsd device nodes the algorithm can consider, and larger numbers are rounded by this maximum.  Since
+ * throttled I/O is usually useful in non-server environment only, a small number 16 is enough in most cases
+ */
+#define LOWPRI_MAX_NUM_DEV 16

 
 __BEGIN_DECLS
 
 
 __BEGIN_DECLS
 

+extern uint32_t mount_generation;

 extern TAILQ_HEAD(mntlist, mount) mountlist;
 void mount_list_lock(void);
 void mount_list_unlock(void);
 void mount_lock_init(mount_t);
 void mount_lock_destroy(mount_t);
 void mount_lock(mount_t);
 extern TAILQ_HEAD(mntlist, mount) mountlist;
 void mount_list_lock(void);
 void mount_list_unlock(void);
 void mount_lock_init(mount_t);
 void mount_lock_destroy(mount_t);
 void mount_lock(mount_t);

+void mount_lock_spin(mount_t);

 void mount_unlock(mount_t);
 void mount_lock_renames(mount_t);
 void mount_unlock_renames(mount_t);
 void mount_ref(mount_t, int);
 void mount_drop(mount_t, int);
 void mount_unlock(mount_t);
 void mount_lock_renames(mount_t);
 void mount_unlock_renames(mount_t);
 void mount_ref(mount_t, int);
 void mount_drop(mount_t, int);

+int  mount_refdrain(mount_t);

 
 /* vfs_rootmountalloc should be kept as a private api */
 errno_t vfs_rootmountalloc(const char *, const char *, mount_t *mpp);
 
 /* vfs_rootmountalloc should be kept as a private api */
 errno_t vfs_rootmountalloc(const char *, const char *, mount_t *mpp);

-errno_t        vfs_init_io_attributes(vnode_t, mount_t);

 
 int    vfs_mountroot(void);
 void   vfs_unmountall(void);
 
 int    vfs_mountroot(void);
 void   vfs_unmountall(void);

-int    safedounmount(struct mount *, int, struct proc *);
-int    dounmount(struct mount *, int, struct proc *);
+int    safedounmount(struct mount *, int, vfs_context_t);
+int    dounmount(struct mount *, int, int, vfs_context_t);

 
 /* xnuy internal api */
 void  mount_dropcrossref(mount_t, vnode_t, int);
 
 /* xnuy internal api */
 void  mount_dropcrossref(mount_t, vnode_t, int);

-int validfsnode(mount_t);

 mount_t mount_lookupby_volfsid(int, int);
 mount_t mount_list_lookupby_fsid(fsid_t *, int, int);
 mount_t mount_lookupby_volfsid(int, int);
 mount_t mount_list_lookupby_fsid(fsid_t *, int, int);

+int  mount_list_add(mount_t);
+void mount_list_remove(mount_t);

 int  mount_iterref(mount_t, int);
 int  mount_isdrained(mount_t, int);
 void mount_iterdrop(mount_t);
 void mount_iterdrain(mount_t);
 void mount_iterreset(mount_t);
 
 int  mount_iterref(mount_t, int);
 int  mount_isdrained(mount_t, int);
 void mount_iterdrop(mount_t);
 void mount_iterdrain(mount_t);
 void mount_iterreset(mount_t);
 

+/* throttled I/O api */
+int throttle_get_io_policy(struct uthread **ut);
+extern void throttle_lowpri_io(boolean_t ok_to_sleep);
+int throttle_io_will_be_throttled(int lowpri_window_msecs, mount_t mp);
+

 __END_DECLS
 
 #endif /* !_SYS_MOUNT_INTERNAL_H_ */
 __END_DECLS
 
 #endif /* !_SYS_MOUNT_INTERNAL_H_ */