xnu-2782.10.72.tar.gz

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

diff --git a/bsd/sys/vnode.h b/bsd/sys/vnode.h
index 681ad05f0de47fb4a668f4e50cca27c38d8e2430..72e1a85321b7edd5f695550264ace158c452fd61 100644 (file)
--- a/bsd/sys/vnode.h
+++ b/bsd/sys/vnode.h
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2014 Apple Inc. All rights reserved.

  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 


@@ -68,6 +68,7 @@
 #include <sys/cdefs.h>
 #ifdef KERNEL
 #include <sys/kernel_types.h>
 #include <sys/cdefs.h>
 #ifdef KERNEL
 #include <sys/kernel_types.h>

+#include <sys/param.h>

 #include <sys/signal.h>
 #endif
 
 #include <sys/signal.h>
 #endif
 


@@ -80,8 +81,14 @@
 /*
  * Vnode types.  VNON means no type.
  */
 /*
  * Vnode types.  VNON means no type.
  */

-enum vtype     { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD, VSTR,
-                         VCPLX };
+enum vtype     { 
+       /* 0 */
+       VNON, 
+       /* 1 - 5 */
+       VREG, VDIR, VBLK, VCHR, VLNK, 
+       /* 6 - 10 */
+       VSOCK, VFIFO, VBAD, VSTR, VCPLX 
+};

 
 /*
  * Vnode tag types.
 
 /*
  * Vnode tag types.


@@ -89,10 +96,21 @@ enum vtype  { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD, VSTR,
  * and should NEVER be inspected by the kernel.
  */
 enum vtagtype  {
  * and should NEVER be inspected by the kernel.
  */
 enum vtagtype  {

-       VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS, VT_LOFS, VT_FDESC,
-       VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS,
-       VT_UNION, VT_HFS, VT_ZFS, VT_DEVFS, VT_WEBDAV, VT_UDF, VT_AFP,
-       VT_CDDA, VT_CIFS, VT_OTHER};
+       /* 0 */
+       VT_NON,
+       /* 1 reserved, overlaps with (CTL_VFS, VFS_NUMMNTOPS) */
+       VT_UFS,
+       /* 2 - 5 */
+       VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS,
+       /* 6 - 10 */
+       VT_LOFS, VT_FDESC, VT_PORTAL, VT_NULL, VT_UMAP, 
+       /* 11 - 15 */
+       VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS, VT_MOCKFS,
+       /* 16 - 20 */
+       VT_HFS, VT_ZFS, VT_DEVFS, VT_WEBDAV, VT_UDF, 
+       /* 21 - 24 */
+       VT_AFP, VT_CDDA, VT_CIFS, VT_OTHER
+};

 
 
 /*
 
 
 /*


@@ -118,6 +136,7 @@ enum vtagtype       {
  */
 #define        VNOVAL  (-1)
 
  */
 #define        VNOVAL  (-1)
 

+

 #ifdef KERNEL
 
 /*
 #ifdef KERNEL
 
 /*


@@ -144,7 +163,13 @@ enum vtagtype      {
 #define IO_BACKGROUND IO_PASSIVE /* used for backward compatibility.  to be removed after IO_BACKGROUND is no longer
                                                                  * used by DiskImages in-kernel mode */
 #define        IO_NOAUTH       0x8000          /* No authorization checks. */
 #define IO_BACKGROUND IO_PASSIVE /* used for backward compatibility.  to be removed after IO_BACKGROUND is no longer
                                                                  * used by DiskImages in-kernel mode */
 #define        IO_NOAUTH       0x8000          /* No authorization checks. */

-
+#define IO_NODIRECT     0x10000                /* don't use direct synchronous writes if IO_NOCACHE is specified */
+#define IO_ENCRYPTED   0x20000         /* Retrieve encrypted blocks from the filesystem */
+#define IO_RETURN_ON_THROTTLE  0x40000
+#define IO_SINGLE_WRITER       0x80000
+#define IO_SYSCALL_DISPATCH            0x100000        /* I/O was originated from a file table syscall */
+#define IO_SWAP_DISPATCH               0x200000        /* I/O was originated from the swap layer */
+#define IO_SKIP_ENCRYPTION             0x400000        /* Skips en(de)cryption on the IO. Must be initiated from kernel */

 
 /*
  * Component Name: this structure describes the pathname
 
 /*
  * Component Name: this structure describes the pathname


@@ -154,29 +179,29 @@ struct componentname {
        /*
         * Arguments to lookup.
         */
        /*
         * Arguments to lookup.
         */

-       u_long  cn_nameiop;     /* lookup operation */
-       u_long  cn_flags;       /* flags (see below) */
+       uint32_t        cn_nameiop;     /* lookup operation */
+       uint32_t        cn_flags;       /* flags (see below) */

 #ifdef BSD_KERNEL_PRIVATE
        vfs_context_t   cn_context;
 #ifdef BSD_KERNEL_PRIVATE
        vfs_context_t   cn_context;

-       void * pad_obsolete2;
+       struct nameidata *cn_ndp;       /* pointer back to nameidata */

 
 /* XXX use of these defines are deprecated */
 #define        cn_proc         (cn_context->vc_proc + 0)       /* non-lvalue */
 #define        cn_cred         (cn_context->vc_ucred + 0)      /* non-lvalue */
 
 #else
 
 /* XXX use of these defines are deprecated */
 #define        cn_proc         (cn_context->vc_proc + 0)       /* non-lvalue */
 #define        cn_cred         (cn_context->vc_ucred + 0)      /* non-lvalue */
 
 #else

-       void * obsolete1;       /* use vfs_context_t */
-       void * obsolete2;       /* use vfs_context_t */
+       void * cn_reserved1;    /* use vfs_context_t */
+       void * cn_reserved2;    /* use vfs_context_t */

 #endif
        /*
         * Shared between lookup and commit routines.
         */
        char    *cn_pnbuf;      /* pathname buffer */
 #endif
        /*
         * Shared between lookup and commit routines.
         */
        char    *cn_pnbuf;      /* pathname buffer */

-       long    cn_pnlen;       /* length of allocated buffer */
+       int     cn_pnlen;       /* length of allocated buffer */

        char    *cn_nameptr;    /* pointer to looked up name */
        char    *cn_nameptr;    /* pointer to looked up name */

-       long    cn_namelen;     /* length of looked up component */
-       u_long  cn_hash;        /* hash value of looked up name */
-       long    cn_consume;     /* chars to consume in lookup() */
+       int     cn_namelen;     /* length of looked up component */
+       uint32_t        cn_hash;        /* hash value of looked up name */
+       uint32_t        cn_consume;     /* chars to consume in lookup() */

 };
 
 /*
 };
 
 /*


@@ -192,7 +217,6 @@ struct componentname {
  * component name operational modifier flags
  */
 #define        FOLLOW          0x00000040 /* follow symbolic links */
  * component name operational modifier flags
  */
 #define        FOLLOW          0x00000040 /* follow symbolic links */

-#define NOTRIGGER      0x10000000 /* don't trigger automounts */

 
 /*
  * component name parameter descriptors.
 
 /*
  * component name parameter descriptors.


@@ -200,10 +224,6 @@ struct componentname {
 #define        ISDOTDOT        0x00002000 /* current component name is .. */
 #define        MAKEENTRY       0x00004000 /* entry is to be added to name cache */
 #define        ISLASTCN        0x00008000 /* this is last component of pathname */
 #define        ISDOTDOT        0x00002000 /* current component name is .. */
 #define        MAKEENTRY       0x00004000 /* entry is to be added to name cache */
 #define        ISLASTCN        0x00008000 /* this is last component of pathname */

-#define        ISWHITEOUT      0x00020000 /* found whiteout */
-#define        DOWHITEOUT      0x00040000 /* do whiteouts */
-
-

 
 /* The following structure specifies a vnode for creation */
 struct vnode_fsparam {
 
 /* The following structure specifies a vnode for creation */
 struct vnode_fsparam {


@@ -228,6 +248,228 @@ struct vnode_fsparam {
 #define VNCREATE_FLAVOR        0
 #define VCREATESIZE sizeof(struct vnode_fsparam)
 
 #define VNCREATE_FLAVOR        0
 #define VCREATESIZE sizeof(struct vnode_fsparam)
 

+
+#ifdef KERNEL_PRIVATE
+/*
+ * Resolver callback SPI for trigger vnodes
+ *
+ * Only available from kernels built with CONFIG_TRIGGERS option
+ */
+
+/*!
+ @enum Pathname Lookup Operations
+ @abstract Constants defining pathname operations (passed to resolver callbacks)
+ */
+enum path_operation    {
+       OP_LOOKUP,
+       OP_MOUNT,
+       OP_UNMOUNT,
+       OP_STATFS,
+       OP_OPEN,
+       OP_LINK,
+       OP_UNLINK,
+       OP_RENAME,
+       OP_CHDIR,
+       OP_CHROOT,
+       OP_MKNOD,
+       OP_MKFIFO,
+       OP_SYMLINK,
+       OP_ACCESS,
+       OP_PATHCONF,
+       OP_READLINK,
+       OP_GETATTR,
+       OP_SETATTR,
+       OP_TRUNCATE,
+       OP_COPYFILE,
+       OP_MKDIR,
+       OP_RMDIR,
+       OP_REVOKE,
+       OP_EXCHANGEDATA,
+       OP_SEARCHFS,
+       OP_FSCTL,
+       OP_GETXATTR,
+       OP_SETXATTR,
+       OP_REMOVEXATTR,
+       OP_LISTXATTR,
+       OP_MAXOP        /* anything beyond previous entry is invalid */
+};
+
+/*!
+ @enum resolver status
+ @abstract Constants defining resolver status
+ @constant RESOLVER_RESOLVED  the resolver has finished (typically means a successful mount)
+ @constant RESOLVER_NOCHANGE  the resolver status didn't change
+ @constant RESOLVER_UNRESOLVED  the resolver has finished (typically means a successful unmount)
+ @constant RESOLVER_ERROR  the resolver encountered an error (errno passed in aux value)
+ @constant RESOLVER_STOP  a request to destroy trigger XXX do we need this???
+ */
+enum resolver_status {
+       RESOLVER_RESOLVED,
+       RESOLVER_NOCHANGE,
+       RESOLVER_UNRESOLVED,
+       RESOLVER_ERROR,
+       RESOLVER_STOP
+};
+
+typedef uint64_t resolver_result_t;
+
+/*
+ * Compound resolver result
+ *
+ * The trigger vnode callbacks use a compound result value. In addition
+ * to the resolver status, it contains a sequence number and an auxiliary
+ * value.
+ *
+ * The sequence value is used by VFS to sequence-stamp trigger vnode
+ * state transitions. It is expected to be incremented each time a
+ * resolver changes state (ie resolved or unresolved). A result
+ * containing a stale sequence (older than a trigger vnode's current
+ * value) will be ignored by VFS.
+ *
+ * The auxiliary value is currently only used to deliver the errno
+ * value for RESOLVER_ERROR status conditions. When a RESOLVER_ERROR
+ * occurs, VFS will propagate this error back to the syscall that
+ * encountered the trigger vnode.
+ */
+extern resolver_result_t vfs_resolver_result(uint32_t seq, enum resolver_status stat, int aux);
+
+/*
+ * Extract values from a compound resolver result
+ */
+extern enum resolver_status vfs_resolver_status(resolver_result_t);
+extern uint32_t vfs_resolver_sequence(resolver_result_t);
+extern int vfs_resolver_auxiliary(resolver_result_t);
+
+
+/*!
+ @typedef trigger_vnode_resolve_callback_t
+ @abstract function prototype for a trigger vnode resolve callback
+ @discussion This function is associated with a trigger vnode during a vnode create.  It is
+ typically called when a lookup operation occurs for a trigger vnode
+ @param vp The trigger vnode which needs resolving
+ @param cnp Various data about lookup, e.g. filename and state flags
+ @param pop The pathname operation that initiated the lookup (see enum path_operation).
+ @param flags
+ @param data Arbitrary data supplied by vnode trigger creator
+ @param ctx Context for authentication.
+ @return RESOLVER_RESOLVED, RESOLVER_NOCHANGE, RESOLVER_UNRESOLVED or RESOLVER_ERROR
+*/
+typedef resolver_result_t (* trigger_vnode_resolve_callback_t)(
+       vnode_t                         vp,
+       const struct componentname *    cnp,
+       enum path_operation             pop,
+       int                             flags,
+       void *                          data,
+       vfs_context_t                   ctx);
+
+/*!
+ @typedef trigger_vnode_unresolve_callback_t
+ @abstract function prototype for a trigger vnode unresolve callback
+ @discussion This function is associated with a trigger vnode during a vnode create.  It is
+ called to unresolve a trigger vnode (typically this means unmount).
+ @param vp The trigger vnode which needs unresolving
+ @param flags Unmount flags
+ @param data Arbitrary data supplied by vnode trigger creator
+ @param ctx Context for authentication.
+ @return RESOLVER_NOCHANGE, RESOLVER_UNRESOLVED or RESOLVER_ERROR
+*/
+typedef resolver_result_t (* trigger_vnode_unresolve_callback_t)(
+       vnode_t         vp,
+       int             flags,
+       void *          data,
+       vfs_context_t   ctx);
+
+/*!
+ @typedef trigger_vnode_rearm_callback_t
+ @abstract function prototype for a trigger vnode rearm callback
+ @discussion This function is associated with a trigger vnode during a vnode create.  It is
+ called to verify a rearm from VFS (i.e. should VFS rearm the trigger?).
+ @param vp The trigger vnode which needs rearming
+ @param flags
+ @param data Arbitrary data supplied by vnode trigger creator
+ @param ctx Context for authentication.
+ @return RESOLVER_NOCHANGE or RESOLVER_ERROR
+*/
+typedef resolver_result_t (* trigger_vnode_rearm_callback_t)(
+       vnode_t         vp,
+       int             flags,
+       void *          data,
+       vfs_context_t   ctx);
+
+/*!
+ @typedef trigger_vnode_reclaim_callback_t
+ @abstract function prototype for a trigger vnode reclaim callback
+ @discussion This function is associated with a trigger vnode during a vnode create.  It is
+ called to deallocate private callback argument data
+ @param vp The trigger vnode associated with the data
+ @param data The arbitrary data supplied by vnode trigger creator
+*/
+typedef void (* trigger_vnode_reclaim_callback_t)(
+       vnode_t         vp,
+       void *          data);
+
+/*!
+ @function vnode_trigger_update
+ @abstract Update a trigger vnode's state.
+ @discussion This allows a resolver to notify VFS of a state change in a trigger vnode.
+ @param vp The trigger vnode whose information to update.
+ @param result A compound resolver result value
+ @return EINVAL if result value is invalid or vp isn't a trigger vnode
+ */
+extern int vnode_trigger_update(vnode_t vp, resolver_result_t result);
+
+struct vnode_trigger_info {
+       trigger_vnode_resolve_callback_t        vti_resolve_func;
+       trigger_vnode_unresolve_callback_t      vti_unresolve_func;
+       trigger_vnode_rearm_callback_t          vti_rearm_func;
+       trigger_vnode_reclaim_callback_t        vti_reclaim_func;
+       void *                                  vti_data;   /* auxiliary data (optional) */
+       uint32_t                                vti_flags;  /* optional flags (see below) */
+};
+
+/*
+ * SPI for creating a trigger vnode
+ *
+ * Uses the VNCREATE_TRIGGER flavor with existing vnode_create() KPI
+ *
+ * Only one resolver per vnode.
+ *
+ * ERRORS (in addition to vnode_create errors):
+ *     EINVAL (invalid resolver info, like invalid flags)
+ *     ENOTDIR (only directories can have a resolver)
+ *     EPERM (vnode cannot be a trigger - eg root dir of a file system)
+ *     ENOMEM
+ */
+struct vnode_trigger_param {
+       struct vnode_fsparam                    vnt_params; /* same as for VNCREATE_FLAVOR */
+       trigger_vnode_resolve_callback_t        vnt_resolve_func;
+       trigger_vnode_unresolve_callback_t      vnt_unresolve_func;
+       trigger_vnode_rearm_callback_t          vnt_rearm_func;
+       trigger_vnode_reclaim_callback_t        vnt_reclaim_func;
+       void *                                  vnt_data;   /* auxiliary data (optional) */
+       uint32_t                                vnt_flags;  /* optional flags (see below) */
+};
+
+#define VNCREATE_TRIGGER       (('T' << 8) + ('V'))
+#define VNCREATE_TRIGGER_SIZE  sizeof(struct vnode_trigger_param)
+
+/*
+ * vnode trigger flags (vnt_flags)
+ *
+ * VNT_AUTO_REARM:
+ * On unmounts of a trigger mount, automatically re-arm the trigger.
+ *
+ * VNT_NO_DIRECT_MOUNT:
+ * A trigger vnode instance that doesn't directly trigger a mount,
+ * instead it triggers the mounting of sub-trigger nodes.
+ */
+#define VNT_AUTO_REARM         (1 << 0)        
+#define VNT_NO_DIRECT_MOUNT    (1 << 1)        
+#define VNT_VALID_MASK         (VNT_AUTO_REARM | VNT_NO_DIRECT_MOUNT)
+
+#endif /* KERNEL_PRIVATE */
+
+

 /*
  * Vnode attributes, new-style.
  *
 /*
  * Vnode attributes, new-style.
  *


@@ -237,12 +479,13 @@ struct vnode_fsparam {
  * Note that this structure may be extended, but existing fields must not move.
  */
 
  * Note that this structure may be extended, but existing fields must not move.
  */
 

-#define VATTR_INIT(v)                  do {(v)->va_supported = (v)->va_active = 0ll; (v)->va_vaflags = 0;} while(0)
+#define VATTR_INIT(v)                  do {(v)->va_supported = (v)->va_active = 0ll; (v)->va_vaflags = 0; } while(0)

 #define VATTR_SET_ACTIVE(v, a)         ((v)->va_active |= VNODE_ATTR_ ## a)
 #define VATTR_SET_SUPPORTED(v, a)      ((v)->va_supported |= VNODE_ATTR_ ## a)
 #define VATTR_IS_SUPPORTED(v, a)       ((v)->va_supported & VNODE_ATTR_ ## a)
 #define VATTR_CLEAR_ACTIVE(v, a)       ((v)->va_active &= ~VNODE_ATTR_ ## a)
 #define VATTR_CLEAR_SUPPORTED(v, a)    ((v)->va_supported &= ~VNODE_ATTR_ ## a)
 #define VATTR_SET_ACTIVE(v, a)         ((v)->va_active |= VNODE_ATTR_ ## a)
 #define VATTR_SET_SUPPORTED(v, a)      ((v)->va_supported |= VNODE_ATTR_ ## a)
 #define VATTR_IS_SUPPORTED(v, a)       ((v)->va_supported & VNODE_ATTR_ ## a)
 #define VATTR_CLEAR_ACTIVE(v, a)       ((v)->va_active &= ~VNODE_ATTR_ ## a)
 #define VATTR_CLEAR_SUPPORTED(v, a)    ((v)->va_supported &= ~VNODE_ATTR_ ## a)

+#define VATTR_CLEAR_SUPPORTED_ALL(v)   ((v)->va_supported = 0)

 #define VATTR_IS_ACTIVE(v, a)          ((v)->va_active & VNODE_ATTR_ ## a)
 #define VATTR_ALL_SUPPORTED(v)         (((v)->va_active & (v)->va_supported) == (v)->va_active)
 #define VATTR_INACTIVE_SUPPORTED(v)    do {(v)->va_active &= ~(v)->va_supported; (v)->va_supported = 0;} while(0)
 #define VATTR_IS_ACTIVE(v, a)          ((v)->va_active & VNODE_ATTR_ ## a)
 #define VATTR_ALL_SUPPORTED(v)         (((v)->va_active & (v)->va_supported) == (v)->va_active)
 #define VATTR_INACTIVE_SUPPORTED(v)    do {(v)->va_active &= ~(v)->va_supported; (v)->va_supported = 0;} while(0)


@@ -287,6 +530,19 @@ struct vnode_fsparam {
 #define VNODE_ATTR_va_guuid            (1LL<<27)       /* 08000000 */
 #define VNODE_ATTR_va_nchildren                (1LL<<28)       /* 10000000 */
 #define VNODE_ATTR_va_dirlinkcount     (1LL<<29)       /* 20000000 */
 #define VNODE_ATTR_va_guuid            (1LL<<27)       /* 08000000 */
 #define VNODE_ATTR_va_nchildren                (1LL<<28)       /* 10000000 */
 #define VNODE_ATTR_va_dirlinkcount     (1LL<<29)       /* 20000000 */

+#define VNODE_ATTR_va_addedtime                (1LL<<30)       /* 40000000 */
+#define VNODE_ATTR_va_dataprotect_class        (1LL<<31)       /* 80000000 */
+#define VNODE_ATTR_va_dataprotect_flags        (1LL<<32)       /* 100000000 */
+#define VNODE_ATTR_va_document_id      (1LL<<33)       /* 200000000 */
+#define VNODE_ATTR_va_devid            (1LL<<34)       /* 400000000 */
+#define VNODE_ATTR_va_objtype          (1LL<<35)       /* 800000000 */
+#define VNODE_ATTR_va_objtag           (1LL<<36)       /* 1000000000 */
+#define VNODE_ATTR_va_user_access      (1LL<<37)       /* 2000000000 */
+#define VNODE_ATTR_va_finderinfo       (1LL<<38)       /* 4000000000 */
+#define VNODE_ATTR_va_rsrc_length      (1LL<<39)       /* 8000000000 */
+#define VNODE_ATTR_va_rsrc_alloc       (1LL<<40)       /* 10000000000 */
+#define VNODE_ATTR_va_fsid64           (1LL<<41)       /* 20000000000 */
+#define VNODE_ATTR_va_write_gencount    (1LL<<42)      /* 40000000000 */

 
 #define VNODE_ATTR_BIT(n)      (VNODE_ATTR_ ## n)
 /*
 
 #define VNODE_ATTR_BIT(n)      (VNODE_ATTR_ ## n)
 /*


@@ -307,7 +563,17 @@ struct vnode_fsparam {
                                VNODE_ATTR_BIT(va_name) |               \
                                VNODE_ATTR_BIT(va_type) |               \
                                VNODE_ATTR_BIT(va_nchildren) |          \
                                VNODE_ATTR_BIT(va_name) |               \
                                VNODE_ATTR_BIT(va_type) |               \
                                VNODE_ATTR_BIT(va_nchildren) |          \

-                               VNODE_ATTR_BIT(va_dirlinkcount))
+                               VNODE_ATTR_BIT(va_dirlinkcount) |       \
+                               VNODE_ATTR_BIT(va_addedtime) |          \
+                               VNODE_ATTR_BIT(va_devid) |              \
+                               VNODE_ATTR_BIT(va_objtype) |            \
+                               VNODE_ATTR_BIT(va_objtag) |             \
+                               VNODE_ATTR_BIT(va_user_access) |        \
+                               VNODE_ATTR_BIT(va_finderinfo) |         \
+                               VNODE_ATTR_BIT(va_rsrc_length) |        \
+                               VNODE_ATTR_BIT(va_rsrc_alloc) |         \
+                               VNODE_ATTR_BIT(va_fsid64) |             \
+                               VNODE_ATTR_BIT(va_write_gencount))

 /*
  * Attributes that can be applied to a new file object.
  */
 /*
  * Attributes that can be applied to a new file object.
  */


@@ -323,7 +589,12 @@ struct vnode_fsparam {
                                VNODE_ATTR_BIT(va_encoding) |           \
                                VNODE_ATTR_BIT(va_type) |               \
                                VNODE_ATTR_BIT(va_uuuid) |              \
                                VNODE_ATTR_BIT(va_encoding) |           \
                                VNODE_ATTR_BIT(va_type) |               \
                                VNODE_ATTR_BIT(va_uuuid) |              \

-                               VNODE_ATTR_BIT(va_guuid))
+                               VNODE_ATTR_BIT(va_guuid) |              \
+                               VNODE_ATTR_BIT(va_dataprotect_class) |  \
+                               VNODE_ATTR_BIT(va_dataprotect_flags) |  \
+                               VNODE_ATTR_BIT(va_document_id))
+
+#include <sys/_types/_fsid_t.h>

 
 struct vnode_attr {
        /* bitfields */
 
 struct vnode_attr {
        /* bitfields */


@@ -341,8 +612,8 @@ struct vnode_attr {
        uint64_t        va_nlink;       /* number of references to this file */
        uint64_t        va_total_size;  /* size in bytes of all forks */
        uint64_t        va_total_alloc; /* disk space used by all forks */
        uint64_t        va_nlink;       /* number of references to this file */
        uint64_t        va_total_size;  /* size in bytes of all forks */
        uint64_t        va_total_alloc; /* disk space used by all forks */

-       uint64_t        va_data_size;   /* size in bytes of the main(data) fork */
-       uint64_t        va_data_alloc;  /* disk space used by the main(data) fork */
+       uint64_t        va_data_size;   /* size in bytes of the fork managed by current vnode */
+       uint64_t        va_data_alloc;  /* disk space used by the fork managed by current vnode */

        uint32_t        va_iosize;      /* optimal I/O blocksize */
 
        /* file security information */
        uint32_t        va_iosize;      /* optimal I/O blocksize */
 
        /* file security information */


@@ -379,16 +650,50 @@ struct vnode_attr {
        uint64_t        va_nchildren;     /* Number of items in a directory */
        uint64_t        va_dirlinkcount;  /* Real references to dir (i.e. excluding "." and ".." refs) */
 
        uint64_t        va_nchildren;     /* Number of items in a directory */
        uint64_t        va_dirlinkcount;  /* Real references to dir (i.e. excluding "." and ".." refs) */
 

+#ifdef BSD_KERNEL_PRIVATE
+       struct kauth_acl *va_base_acl;
+#else
+       void *          va_reserved1;
+#endif /* BSD_KERNEL_PRIVATE */
+       struct timespec va_addedtime;   /* timestamp when item was added to parent directory */
+               
+       /* Data Protection fields */
+       uint32_t va_dataprotect_class;  /* class specified for this file if it didn't exist */
+       uint32_t va_dataprotect_flags;  /* flags from NP open(2) to the filesystem */
+
+       /* Document revision tracking */
+       uint32_t va_document_id;
+
+       /* Fields for Bulk args */
+       uint32_t        va_devid;       /* devid of filesystem */
+       uint32_t        va_objtype;     /* type of object */
+       uint32_t        va_objtag;      /* vnode tag of filesystem */
+       uint32_t        va_user_access; /* access for user */
+       uint8_t         va_finderinfo[32];      /* Finder Info */
+       uint64_t        va_rsrc_length; /* Resource Fork length */
+       uint64_t        va_rsrc_alloc;  /* Resource Fork allocation size */
+       fsid_t          va_fsid64;      /* fsid, of the correct type  */
+
+       uint32_t va_write_gencount;     /* counter that increments each time the file changes */
+

        /* add new fields here only */
 };
 
        /* add new fields here only */
 };
 

-/*
- * Flags for va_vaflags.
+#ifdef BSD_KERNEL_PRIVATE
+/* 
+ * Flags for va_dataprotect_flags

  */
  */

-#define        VA_UTIMES_NULL  0x010000        /* utimes argument was NULL */
-#define VA_EXCLUSIVE   0x020000        /* exclusive create request */
+#define VA_DP_RAWENCRYPTED 0x0001

 
 

+#endif

 
 

+/*
+ * Flags for va_vaflags.
+ */
+#define        VA_UTIMES_NULL          0x010000        /* utimes argument was NULL */
+#define VA_EXCLUSIVE           0x020000        /* exclusive create request */
+#define VA_NOINHERIT           0x040000        /* Don't inherit ACLs from parent */
+#define VA_NOAUTH              0x080000        

 
 /*
  *  Modes.  Some values same as Ixxx entries from inode.h for now.
 
 /*
  *  Modes.  Some values same as Ixxx entries from inode.h for now.


@@ -400,7 +705,6 @@ struct vnode_attr {
 #define        VWRITE  0x080 /*00200*/
 #define        VEXEC   0x040 /*00100*/
 
 #define        VWRITE  0x080 /*00200*/
 #define        VEXEC   0x040 /*00100*/
 

-

 /*
  * Convert between vnode types and inode formats (since POSIX.1
  * defines mode word of stat structure in terms of inode formats).
 /*
  * Convert between vnode types and inode formats (since POSIX.1
  * defines mode word of stat structure in terms of inode formats).


@@ -411,7 +715,6 @@ extern int          vttoif_tab[];
 #define VTTOIF(indx)   (vttoif_tab[(int)(indx)])
 #define MAKEIMODE(indx, mode)  (int)(VTTOIF(indx) | (mode))
 
 #define VTTOIF(indx)   (vttoif_tab[(int)(indx)])
 #define MAKEIMODE(indx, mode)  (int)(VTTOIF(indx) | (mode))
 

-

 /*
  * Flags to various vnode functions.
  */
 /*
  * Flags to various vnode functions.
  */


@@ -428,24 +731,18 @@ extern int                vttoif_tab[];
 
 #define        REVOKEALL       0x0001          /* vnop_revoke: revoke all aliases */
 
 
 #define        REVOKEALL       0x0001          /* vnop_revoke: revoke all aliases */
 

-/* VNOP_REMOVE: do not delete busy files (Carbon remove file semantics) */
-#define VNODE_REMOVE_NODELETEBUSY  0x0001  
+/* VNOP_REMOVE/unlink flags */
+#define VNODE_REMOVE_NODELETEBUSY                      0x0001 /* Don't delete busy files (Carbon) */  
+#define VNODE_REMOVE_SKIP_NAMESPACE_EVENT      0x0002 /* Do not upcall to userland handlers */

 
 /* VNOP_READDIR flags: */
 #define VNODE_READDIR_EXTENDED    0x0001   /* use extended directory entries */
 #define VNODE_READDIR_REQSEEKOFF  0x0002   /* requires seek offset (cookies) */
 #define VNODE_READDIR_SEEKOFF32   0x0004   /* seek offset values should fit in 32 bits */
 
 /* VNOP_READDIR flags: */
 #define VNODE_READDIR_EXTENDED    0x0001   /* use extended directory entries */
 #define VNODE_READDIR_REQSEEKOFF  0x0002   /* requires seek offset (cookies) */
 #define VNODE_READDIR_SEEKOFF32   0x0004   /* seek offset values should fit in 32 bits */

-
+#define VNODE_READDIR_NAMEMAX     0x0008   /* For extended readdir, try to limit names to NAME_MAX bytes */

 
 #define        NULLVP  ((struct vnode *)NULL)
 
 
 #define        NULLVP  ((struct vnode *)NULL)
 

-/*
- * Macro/function to check for client cache inconsistency w.r.t. leasing.
- */
-#define        LEASE_READ      0x1             /* Check lease for readers */
-#define        LEASE_WRITE     0x2             /* Check lease for modifiers */
-
-

 #ifndef BSD_KERNEL_PRIVATE
 struct vnodeop_desc;
 #endif
 #ifndef BSD_KERNEL_PRIVATE
 struct vnodeop_desc;
 #endif


@@ -466,8 +763,10 @@ struct vnodeopv_desc {
        struct vnodeopv_entry_desc *opv_desc_ops;   /* null terminated list */
 };
 
        struct vnodeopv_entry_desc *opv_desc_ops;   /* null terminated list */
 };
 

-/*
- * A default routine which just returns an error.
+/*!
+ @function vn_default_error
+ @abstract Default vnode operation to fill unsupported slots in vnode operation vectors.
+ @return ENOTSUP

  */
 int vn_default_error(void);
 
  */
 int vn_default_error(void);
 


@@ -489,166 +788,913 @@ typedef int kauth_action_t;
 
 __BEGIN_DECLS
 
 
 __BEGIN_DECLS
 

-errno_t        vnode_create(int, size_t, void  *, vnode_t *);
+/*!
+ @function vnode_create
+ @abstract Create and initialize a vnode.
+ @discussion Returns wth an iocount held on the vnode which must eventually be dropped with vnode_put().
+ @param flavor Should be VNCREATE_FLAVOR.
+ @param size  Size of the struct vnode_fsparam in "data".
+ @param data  Pointer to a struct vnode_fsparam containing initialization information.
+ @param vpp  Pointer to a vnode pointer, to be filled in with newly created vnode.
+ @return 0 for success, error code otherwise.
+ */
+errno_t        vnode_create(uint32_t, uint32_t, void  *, vnode_t *);
+
+/*!
+ @function vnode_addfsref
+ @abstract Mark a vnode as being stored in a filesystem hash.
+ @discussion Should only be called once on a vnode, and never if that vnode was created with VNFS_ADDFSREF.
+ There should be a corresponding call to vnode_removefsref() when the vnode is reclaimed; VFS assumes that a
+ n unused vnode will not be marked as referenced by a filesystem.
+ @param vp The vnode to mark.
+ @return Always 0.
+ */

 int    vnode_addfsref(vnode_t);
 int    vnode_addfsref(vnode_t);

+
+/*!
+ @function vnode_removefsref
+ @abstract Mark a vnode as no longer being stored in a filesystem hash.
+ @discussion Should only be called once on a vnode (during a reclaim), and only after the vnode has either been created with VNFS_ADDFSREF or marked by vnode_addfsref().
+ @param vp The vnode to unmark.
+ @return Always 0.
+ */

 int    vnode_removefsref(vnode_t);
 
 int    vnode_removefsref(vnode_t);
 

+/*!
+ @function vnode_hasdirtyblks 
+ @abstract Check if a vnode has dirty data waiting to be written to disk.
+ @discussion Note that this routine is unsynchronized; it is only a snapshot and its result may cease to be true at the moment it is returned..
+ @param vp The vnode to test.
+ @return Nonzero if there are dirty blocks, 0 otherwise
+ */

 int    vnode_hasdirtyblks(vnode_t);
 int    vnode_hasdirtyblks(vnode_t);

+
+/*!
+ @function vnode_hascleanblks
+ @abstract Check if a vnode has clean buffers associated with it.
+ @discussion Note that this routine is unsynchronized; it is only a snapshot and its result may cease to be true at the moment it is returned..
+ @param vp The vnode to test.
+ @return Nonzero if there are clean blocks, 0 otherwise.
+ */

 int    vnode_hascleanblks(vnode_t);
 int    vnode_hascleanblks(vnode_t);

+

 #define        VNODE_ASYNC_THROTTLE    15
 #define        VNODE_ASYNC_THROTTLE    15

-/* timeout is in 10 msecs and not hz tick based */
+/*!
+ @function vnode_waitforwrites
+ @abstract Wait for the number of pending writes on a vnode to drop below a target.
+ @param vp The vnode to monitor.
+ @param output_target Max pending write count with which to return.
+ @param slpflag Flags for msleep().
+ @param slptimeout Frequency with which to force a check for completion; increments of 10 ms.
+ @param msg String to pass  msleep() .
+ @return 0 for success, or an error value from msleep().
+ */

 int    vnode_waitforwrites(vnode_t, int, int, int, const char *);
 int    vnode_waitforwrites(vnode_t, int, int, int, const char *);

+
+/*!
+ @function vnode_startwrite
+ @abstract Increment the count of pending writes on a vnode.
+ @param vp The vnode whose count to increment.
+ @return void.
+ */

 void   vnode_startwrite(vnode_t);
 void   vnode_startwrite(vnode_t);

+
+/*!
+ @function vnode_startwrite
+ @abstract Decrement the count of pending writes on a vnode .
+ @discussion Also wakes up threads waiting for the write count to drop, as in vnode_waitforwrites.
+ @param vp The vnode whose count to decrement.
+ @return void.
+ */

 void   vnode_writedone(vnode_t);
 
 void   vnode_writedone(vnode_t);
 

+/*!
+ @function vnode_vtype
+ @abstract Return a vnode's type.
+ @param vp The vnode whose type to grab.
+ @return The vnode's type.
+ */

 enum vtype     vnode_vtype(vnode_t);
 enum vtype     vnode_vtype(vnode_t);

+
+/*!
+ @function vnode_vid
+ @abstract Return a vnode's vid (generation number), which is constant from creation until reclaim. 
+ @param vp The vnode whose vid to grab.
+ @return The vnode's vid.
+ */

 uint32_t       vnode_vid(vnode_t);
 uint32_t       vnode_vid(vnode_t);

+
+/*!
+ @function vnode_mountedhere
+ @abstract Returns a pointer to a mount placed on top of a vnode, should it exist.
+ @param vp The vnode from whom to take the covering mount.
+ @return Pointer to mount covering a vnode, or NULL if none exists.
+ */

 mount_t        vnode_mountedhere(vnode_t vp);
 mount_t        vnode_mountedhere(vnode_t vp);

+
+/*!
+ @function vnode_mount
+ @abstract Get the mount structure for the filesystem that a vnode belongs to.
+ @param vp The vnode whose mount to grab.
+ @return The mount, directly.
+ */

 mount_t        vnode_mount(vnode_t);
 mount_t        vnode_mount(vnode_t);

-errno_t vfs_mountref(mount_t);
-errno_t vfs_mountrele(mount_t);
+
+/*!
+ @function vnode_specrdev
+ @abstract Return the device id of the device associated with a special file.
+ @param vp The vnode whose device id to extract--vnode must be a special file.
+ @return The device id.
+ */

 dev_t  vnode_specrdev(vnode_t);
 dev_t  vnode_specrdev(vnode_t);

+
+/*!
+ @function vnode_fsnode
+ @abstract Gets the filesystem-specific data associated with a vnode.
+ @param vp The vnode whose data to grab.
+ @return The filesystem-specific data, directly.
+ */

 void * vnode_fsnode(vnode_t);
 void * vnode_fsnode(vnode_t);

+
+/*!
+ @function vnode_clearfsnode
+ @abstract Sets a vnode's filesystem-specific data to be NULL.
+ @discussion This routine should only be called when a vnode is no longer in use, i.e. during a VNOP_RECLAIM.
+ @param vp The vnode whose data to clear out.
+ @return void.
+ */

 void   vnode_clearfsnode(vnode_t);
 
 void   vnode_clearfsnode(vnode_t);
 

+/*!
+ @function vnode_isvroot
+ @abstract Determine if a vnode is the root of its filesystem.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is the root, 0 if it is not.
+ */

 int    vnode_isvroot(vnode_t);
 int    vnode_isvroot(vnode_t);

+
+/*!
+ @function vnode_issystem
+ @abstract Determine if a vnode is marked as a System vnode.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is a system vnode, 0 if it is not.
+ */

 int    vnode_issystem(vnode_t);
 int    vnode_issystem(vnode_t);

-int    vnode_isswap(vnode_t vp);
+
+/*!
+ @function vnode_ismount
+ @abstract Determine if there is currently a mount occurring which will cover this vnode.
+ @discussion Note that this is only a snapshot; a mount may begin or end at any time.
+ @param vp The vnode to test.
+ @return Nonzero if there is a mount in progress, 0 otherwise.
+ */

 int    vnode_ismount(vnode_t);
 int    vnode_ismount(vnode_t);

+
+/*!
+ @function vnode_isreg
+ @abstract Determine if a vnode is a regular file.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is of type VREG, 0 otherwise.
+ */

 int    vnode_isreg(vnode_t);
 int    vnode_isreg(vnode_t);

+
+/*!
+ @function vnode_isdir
+ @abstract Determine if a vnode is a directory.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is of type VDIR, 0 otherwise.
+ */

 int    vnode_isdir(vnode_t);
 int    vnode_isdir(vnode_t);

+
+/*!
+ @function vnode_islnk
+ @abstract Determine if a vnode is a symbolic link.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is of type VLNK, 0 otherwise.
+ */

 int    vnode_islnk(vnode_t);
 int    vnode_islnk(vnode_t);

+
+/*!
+ @function vnode_isfifo
+ @abstract Determine if a vnode is a named pipe.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is of type VFIFO, 0 otherwise.
+ */

 int    vnode_isfifo(vnode_t);
 int    vnode_isfifo(vnode_t);

+
+/*!
+ @function vnode_isblk
+ @abstract Determine if a vnode is a block device special file.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is of type VBLK, 0 otherwise.
+ */

 int    vnode_isblk(vnode_t);
 int    vnode_isblk(vnode_t);

+
+/*!
+ @function vnode_ischr
+ @abstract Determine if a vnode is a character device special file.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is of type VCHR, 0 otherwise.
+ */

 int    vnode_ischr(vnode_t);
 
 int    vnode_ischr(vnode_t);
 

+/*!
+ @function vnode_isswap
+ @abstract Determine if a vnode is being used as a swap file.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is being used as swap, 0 otherwise.
+ */
+int    vnode_isswap(vnode_t vp);
+

 #ifdef __APPLE_API_UNSTABLE
 #ifdef __APPLE_API_UNSTABLE

+/*!
+ @function vnode_isnamedstream
+ @abstract Determine if a vnode is a named stream.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is a named stream, 0 otherwise.
+ */

 int    vnode_isnamedstream(vnode_t);
 #endif
 
 int    vnode_isnamedstream(vnode_t);
 #endif
 

-enum vtype     vnode_iftovt(int);
-int    vnode_vttoif(enum vtype);
-int    vnode_makeimode(int, int);
-
+/*!
+ @function vnode_ismountedon
+ @abstract Determine if a vnode is a block device on which a filesystem has been mounted.
+ @discussion A block device marked as being mounted on cannot be opened.
+ @param vp The vnode to test.
+ @return Nonzero if the vnode is a block device on which an filesystem is mounted, 0 otherwise.
+ */

 int    vnode_ismountedon(vnode_t);
 int    vnode_ismountedon(vnode_t);

+
+/*!
+ @function vnode_setmountedon
+ @abstract Set flags indicating that a block device vnode has been mounted as a filesystem.
+ @discussion A block device marked as being mounted on cannot be opened.
+ @param vp The vnode to set flags on, a block device.
+ @return void.
+ */

 void   vnode_setmountedon(vnode_t);
 void   vnode_setmountedon(vnode_t);

+
+/*!
+ @function vnode_clearmountedon
+ @abstract Clear flags indicating that a block device vnode has been mounted as a filesystem.
+ @param vp The vnode to clear flags on, a block device.
+ @return void.
+ */

 void   vnode_clearmountedon(vnode_t);
 
 void   vnode_clearmountedon(vnode_t);
 

+/*!
+ @function vnode_isrecycled
+ @abstract Check if a vnode is dead or in the process of being killed (recycled).
+ @discussion This is only a snapshot: a vnode may start to be recycled, or go from dead to in use, at any time.
+ @param vp The vnode to test.
+ @return Nonzero if vnode is dead or being recycled, 0 otherwise.
+ */

 int    vnode_isrecycled(vnode_t);
 int    vnode_isrecycled(vnode_t);

+
+/*!
+ @function vnode_isnocache
+ @abstract Check if a vnode is set to not have its data cached in memory  (i.e. we write-through to disk and always read from disk).
+ @param vp The vnode to test.
+ @return Nonzero if vnode is set to not have data chached, 0 otherwise.
+ */

 int    vnode_isnocache(vnode_t);
 int    vnode_isnocache(vnode_t);

+
+/*!
+ @function vnode_israge
+ @abstract Check if a vnode is marked for rapid aging
+ @param vp The vnode to test.
+ @return Nonzero if vnode is marked for rapid aging, 0 otherwise
+ */
+int    vnode_israge(vnode_t);
+
+/*!
+ @function vnode_needssnapshots
+ @abstract Check if a vnode needs snapshots events (regardless of its ctime status)
+ @param vp The vnode to test.
+ @return Nonzero if vnode needs snapshot events, 0 otherwise
+ */
+int    vnode_needssnapshots(vnode_t);
+
+/*!
+ @function vnode_setnocache
+ @abstract Set a vnode to not have its data cached in memory (i.e. we write-through to disk and always read from disk).
+ @param vp The vnode whose flags to set.
+ @return void.
+ */

 void   vnode_setnocache(vnode_t);
 void   vnode_setnocache(vnode_t);

+
+/*!
+ @function vnode_clearnocache
+ @abstract Clear the flag on a vnode indicating that data should not be cached in memory (i.e. we write-through to disk and always read from disk).
+ @param vp The vnode whose flags to clear.
+ @return void.
+ */

 void   vnode_clearnocache(vnode_t);
 void   vnode_clearnocache(vnode_t);

+
+/*!
+ @function vnode_isnoreadahead
+ @abstract Check if a vnode is set to not have data speculatively read in in hopes of future cache hits.
+ @param vp The vnode to test.
+ @return Nonzero if readahead is disabled, 0 otherwise.
+ */

 int    vnode_isnoreadahead(vnode_t);
 int    vnode_isnoreadahead(vnode_t);

-int    vnode_isstandard(vnode_t);
+
+/*!
+ @function vnode_setnoreadahead
+ @abstract Set a vnode to not have data speculatively read in in hopes of hitting in cache.
+ @param vp The vnode on which to prevent readahead.
+ @return void.
+ */

 void   vnode_setnoreadahead(vnode_t);
 void   vnode_setnoreadahead(vnode_t);

-void   vnode_clearnoreadahead(vnode_t);

 
 

-int    vnode_is_openevt(vnode_t);
-void   vnode_set_openevt(vnode_t);
-void   vnode_clear_openevt(vnode_t);
+/*!
+ @function vnode_clearnoreadahead
+ @abstract Clear the flag indicating that a vnode should not have data speculatively read in.
+ @param vp The vnode whose flag to clear.
+ @return void.
+ */
+void   vnode_clearnoreadahead(vnode_t);

 
 /* left only for compat reasons as User code depends on this from getattrlist, for ex */
 
 /* left only for compat reasons as User code depends on this from getattrlist, for ex */

+
+/*!
+ @function vnode_settag
+ @abstract Set a vnode filesystem-specific "tag."
+ @discussion Sets a tag indicating which filesystem a vnode belongs to, e.g. VT_HFS, VT_UDF, VT_ZFS.  The kernel never inspects this data, though the filesystem tags are defined in vnode.h; it is for the benefit of user programs via getattrlist.
+ @param vp The vnode whose tag to set.
+ @return void.
+ */

 void   vnode_settag(vnode_t, int);
 void   vnode_settag(vnode_t, int);

+
+/*!
+ @function vnode_tag
+ @abstract Get the vnode filesystem-specific "tag."
+ @discussion Gets the tag indicating which filesystem a vnode belongs to, e.g. VT_HFS, VT_UDF, VT_ZFS.  The kernel never inspects this data, though the filesystem tags are defined in vnode.h; it is for the benefit of user programs via getattrlist.
+ @param vp The vnode whose tag to grab.
+ @return The tag.
+ */

 int    vnode_tag(vnode_t);
 int    vnode_tag(vnode_t);

+
+/*!
+ @function vnode_getattr
+ @abstract Get vnode attributes.
+ @discussion Desired attributes are set with VATTR_SET_ACTIVE and VNODE_ATTR* macros.  Supported attributes are determined after call with VATTR_IS_SUPPORTED.
+ @param vp The vnode whose attributes to grab.
+ @param vap Structure containing: 1) A list of requested attributes 2) Space to indicate which attributes are supported and being returned 3) Space to return attributes.
+ @param ctx Context for authentication.
+ @return 0 for success or an error code.
+ */

 int    vnode_getattr(vnode_t vp, struct vnode_attr *vap, vfs_context_t ctx);
 int    vnode_getattr(vnode_t vp, struct vnode_attr *vap, vfs_context_t ctx);

+
+/*!
+ @function vnode_setattr
+ @abstract Set vnode attributes.
+ @discussion Attributes to set are marked with VATTR_SET_ACTIVE and VNODE_ATTR* macros.  Attributes successfully set are determined after call with VATTR_IS_SUPPORTED.
+ @param vp The vnode whose attributes to set.
+ @param vap Structure containing: 1) A list of attributes to set 2) Space for values for those attributes 3) Space to indicate which attributes were set.
+ @param ctx Context for authentication.
+ @return 0 for success or an error code.
+ */

 int    vnode_setattr(vnode_t vp, struct vnode_attr *vap, vfs_context_t ctx);
 
 int    vnode_setattr(vnode_t vp, struct vnode_attr *vap, vfs_context_t ctx);
 

+/*!
+ @function vfs_rootvnode
+ @abstract Returns the root vnode with an iocount.
+ @discussion Caller must vnode_put() the root node when done.
+ @return Pointer to root vnode if successful; error code if there is a problem taking an iocount.
+ */

 vnode_t vfs_rootvnode(void);
 vnode_t vfs_rootvnode(void);

-uint32_t vnode_vfsvisflags(vnode_t);
-uint32_t vnode_vfscmdflags(vnode_t);
-struct vfsstatfs *vnode_vfsstatfs(vnode_t);
-void   *vnode_vfsfsprivate(vnode_t);
-vnode_t        current_workingdir(void);
-vnode_t        current_rootdir(void);

 
 

+/*!
+ @function vnode_uncache_credentials
+ @abstract Clear out cached credentials on a vnode.
+ @discussion When we authorize an action on a vnode, we cache the credential that was authorized and the actions it was authorized for in case a similar request follows.  This function destroys that caching.
+ @param vp The vnode whose cache to clear.
+ @return void.
+ */

 void   vnode_uncache_credentials(vnode_t vp);
 void   vnode_uncache_credentials(vnode_t vp);

-void   vnode_setmultipath(vnode_t vp);
-
-#ifdef BSD_KERNEL_PRIVATE

 
 

-/*
- * Indicate that a file has multiple hard links.  VFS will always call
- * VNOP_LOOKUP on this vnode.  Volfs will always ask for it's parent
- * object ID (instead of using the v_parent pointer).
+/*!
+ @function vnode_setmultipath
+ @abstract Mark a vnode as being reachable by multiple paths, i.e. as a hard link.
+ @discussion "Multipath" vnodes can be reached through more than one entry in the filesystem, and so must be handled differently for caching and event notification purposes.  A filesystem should mark a vnode with multiple hardlinks this way.
+ @param vp The vnode to mark.
+ @return void.

  */
  */

+void   vnode_setmultipath(vnode_t vp);

 
 

-vnode_t vnode_parent(vnode_t);
-void vnode_setparent(vnode_t, vnode_t);
-const char * vnode_name(vnode_t);
-void vnode_setname(vnode_t, char *);
-int vnode_isnoflush(vnode_t);
-void vnode_setnoflush(vnode_t);
-void vnode_clearnoflush(vnode_t);
-/* XXX temporary until we can arrive at a KPI for NFS, Seatbelt */
-thread_t vfs_context_thread(vfs_context_t);
-#endif
-
+/*!
+ @function vnode_vfsmaxsymlen
+ @abstract Determine the maximum length of a symbolic link for the filesystem on which a vnode resides.
+ @param vp The vnode for which to get filesystem symlink size cap.
+ @return Max symlink length.
+ */

 uint32_t  vnode_vfsmaxsymlen(vnode_t);
 uint32_t  vnode_vfsmaxsymlen(vnode_t);

+
+/*!
+ @function vnode_vfsisrdonly
+ @abstract Determine if the filesystem to which a vnode belongs is mounted read-only.
+ @param vp The vnode for which to get filesystem writeability.
+ @return Nonzero if the filesystem is read-only, 0 otherwise.
+ */

 int    vnode_vfsisrdonly(vnode_t);
 int    vnode_vfsisrdonly(vnode_t);

+
+/*!
+ @function vnode_vfstypenum
+ @abstract Get the "type number" of the filesystem to which a vnode belongs.
+ @discussion This is an archaic construct; most filesystems are assigned a type number based on the order in which they are registered with the system.
+ @param vp The vnode whose filesystem to examine.
+ @return The type number of the fileystem to which the vnode belongs.
+ */

 int    vnode_vfstypenum(vnode_t);
 int    vnode_vfstypenum(vnode_t);

+
+/*!
+ @function vnode_vfsname
+ @abstract Get the name of the filesystem to which a vnode belongs.
+ @param vp The vnode whose filesystem to examine.
+ @param buf Destination for vfs name: should have size MFSNAMELEN or greater.
+ @return The name of the fileystem to which the vnode belongs.
+ */

 void   vnode_vfsname(vnode_t, char *);
 void   vnode_vfsname(vnode_t, char *);

+
+/*!
+ @function vnode_vfs64bitready
+ @abstract Determine if the filesystem to which a vnode belongs is marked as ready to interact with 64-bit user processes.
+ @param vp The vnode whose filesystem to examine.
+ @return Nonzero if filesystem is marked ready for 64-bit interactions; 0 otherwise.
+ */

 int    vnode_vfs64bitready(vnode_t);
 
 int    vnode_vfs64bitready(vnode_t);
 

+/* These should move to private ... not documenting for now */

 int    vfs_context_get_special_port(vfs_context_t, int, ipc_port_t *);
 int    vfs_context_set_special_port(vfs_context_t, int, ipc_port_t);
 int    vfs_context_get_special_port(vfs_context_t, int, ipc_port_t *);
 int    vfs_context_set_special_port(vfs_context_t, int, ipc_port_t);

+
+/*!
+ @function vfs_context_proc
+ @abstract Get the BSD process structure associated with a vfs_context_t.
+ @param ctx Context whose associated process to find.
+ @return Process if available, NULL otherwise.
+ */

 proc_t vfs_context_proc(vfs_context_t);
 proc_t vfs_context_proc(vfs_context_t);

-vnode_t vfs_context_cwd(vfs_context_t);
+
+/*!
+ @function vfs_context_ucred
+ @abstract Get the credential associated with a vfs_context_t.
+ @discussion Succeeds if and only if the context has a thread, the thread has a task, and the task has a BSD proc.
+ @param ctx Context whose associated process to find.
+ @returns credential if process available; NULL otherwise
+ */

 kauth_cred_t   vfs_context_ucred(vfs_context_t);
 kauth_cred_t   vfs_context_ucred(vfs_context_t);

-int    vfs_context_issuser(vfs_context_t);
+
+/*!
+ @function vfs_context_pid
+ @abstract Get the process id of the BSD process associated with a vfs_context_t.
+ @param ctx Context whose associated process to find.
+ @return Process id.
+ */

 int    vfs_context_pid(vfs_context_t);
 int    vfs_context_pid(vfs_context_t);

+
+/*!
+ @function vfs_context_issignal
+ @abstract Get a bitfield of pending signals for the BSD process associated with a vfs_context_t.
+ @discussion The bitfield is constructed using the sigmask() macro, in the sense of bits |= sigmask(SIGSEGV).
+ @param ctx Context whose associated process to find.
+ @return Bitfield of pending signals.
+ */

 int    vfs_context_issignal(vfs_context_t, sigset_t);
 int    vfs_context_issignal(vfs_context_t, sigset_t);

+
+/*!
+ @function vfs_context_suser
+ @abstract Determine if a vfs_context_t corresponds to the superuser.
+ @param ctx Context to examine.
+ @return Nonzero if context belongs to superuser, 0 otherwise.
+ */

 int    vfs_context_suser(vfs_context_t);
 int    vfs_context_suser(vfs_context_t);

+
+/*!
+ @function vfs_context_is64bit
+ @abstract Determine if a vfs_context_t corresponds to a 64-bit user process.
+ @param ctx Context to examine.
+ @return Nonzero if context is of 64-bit process, 0 otherwise.
+ */

 int    vfs_context_is64bit(vfs_context_t);
 int    vfs_context_is64bit(vfs_context_t);

+
+/*!
+ @function vfs_context_create
+ @abstract Create a new vfs_context_t with appropriate references held.
+ @discussion The context must be released with vfs_context_rele() when no longer in use.
+ @param ctx Context to copy, or NULL to use information from running thread.
+ @return The new context, or NULL in the event of failure.
+ */

 vfs_context_t vfs_context_create(vfs_context_t);
 vfs_context_t vfs_context_create(vfs_context_t);

+
+/*!
+ @function vfs_context_rele
+ @abstract Release references on components of a context and deallocate it.
+ @discussion A context should not be referenced after vfs_context_rele has been called.
+ @param ctx Context to release.
+ @return Always 0.
+ */

 int vfs_context_rele(vfs_context_t);
 int vfs_context_rele(vfs_context_t);

-vfs_context_t vfs_context_current(void);       /* get from current uthread */
-#ifdef __APPLE_API_UNSTABLE
-vfs_context_t vfs_context_kernel(void);                /* get from 1st kernel thread */
-#endif

 
 

+/*!
+ @function vfs_context_current
+ @abstract Get the vfs_context for the current thread, or the kernel context if there is no context for current thread.
+ @discussion Kexts should not use this function--it is preferred to use vfs_context_create(NULL) and vfs_context_rele(), which ensure proper reference counting of underlying structures.
+ @return Context for current thread, or kernel context if thread context is unavailable.
+ */
+vfs_context_t vfs_context_current(void);
+#ifdef KERNEL_PRIVATE
+int    vfs_context_bind(vfs_context_t);
+
+/*!
+ @function vfs_ctx_skipatime
+ @abstract Check to see if this context should skip updating a vnode's access times.
+ @discussion  This is currently tied to the vnode rapid aging process.  If the process is marked for rapid aging, 
+ then the kernel should not update vnodes it touches for access time purposes.  This will check to see if the
+ specified process and/or thread is marked for rapid aging when it manipulates vnodes. 
+ @param ctx The context being investigated. 
+ @return 1 if we should skip access time updates.  
+ @return 0 if we should NOT skip access time updates.
+ */
+
+int    vfs_ctx_skipatime(vfs_context_t ctx);

 
 

+#endif
+
+/*!
+ @function vflush
+ @abstract Reclaim the vnodes associated with a mount.
+ @param mp The mount whose vnodes to kill.
+ @param skipvp A specific vnode to not reclaim or to let interrupt an un-forced flush
+ @param flags  Control which 
+ @discussion This function is used to clear out the vnodes associated with a mount as part of the unmount process.  
+ Its parameters can determine which vnodes to skip in the process and whether in-use vnodes should be forcibly reclaimed.
+ Filesystems should call this function from their unmount code, because VFS code will always call it with SKIPROOT | SKIPSWAP | SKIPSYSTEM; filesystems
+ must take care of such vnodes themselves.
+       SKIPSYSTEM skip vnodes marked VSYSTEM 
+       FORCECLOSE force file closeure 
+       WRITECLOSE only close writeable files 
+       SKIPSWAP   skip vnodes marked VSWAP 
+       SKIPROOT   skip root vnodes marked VROOT 
+ @return 0 for success, EBUSY if vnodes were busy and FORCECLOSE was not set.
+ */

 int    vflush(struct mount *mp, struct vnode *skipvp, int flags);
 int    vflush(struct mount *mp, struct vnode *skipvp, int flags);

+
+/*!
+ @function vnode_get
+ @abstract Increase the iocount on a vnode.
+ @discussion If vnode_get() succeeds, the resulting io-reference must be dropped with vnode_put().
+ This function succeeds unless the vnode in question is dead or in the process of dying AND the current iocount is zero.  
+ This means that it can block an ongoing reclaim which is blocked behind some other iocount.
+
+ On success, vnode_get() returns with an iocount held on the vnode; this type of reference is intended to be held only for short periods of time (e.g.
+ across a function call) and provides a strong guarantee about the life of the vnode; vnodes with positive iocounts cannot be
+ recycled, and an iocount is required for any  operation on a vnode.  However, vnode_get() does not provide any guarantees 
+ about the identity of the vnode it is called on; unless there is a known existing iocount on the vnode at time the call is made,
+ it could be recycled and put back in use before the vnode_get() succeeds, so the caller may be referencing a 
+ completely different vnode than was intended.  vnode_getwithref() and vnode_getwithvid()
+ provide guarantees about vnode identity.
+
+ @return 0 for success, ENOENT if the vnode is dead and without existing io-reference.
+ */

 int    vnode_get(vnode_t);
 int    vnode_get(vnode_t);

-int    vnode_getwithvid(vnode_t, int);
+
+/*!
+ @function vnode_getwithvid
+ @abstract Increase the iocount on a vnode, checking that the vnode is alive and has not changed vid (i.e. been recycled)
+ @discussion If vnode_getwithvid() succeeds, the resulting io-reference must be dropped with vnode_put().
+ This function succeeds unless the vnode in question is dead, in the process of dying, or has been recycled (and given a different vnode id).
+ The intended usage is that a vnode is stored and its vid (vnode_vid(vp)) recorded while an iocount is held (example: a filesystem hash).  The
+ iocount is then dropped, and time passes (perhaps locks are dropped and picked back up). Subsequently, vnode_getwithvid() is called to get an iocount, 
+ but we are alerted if the vnode has been recycled.
+
+ On success, vnode_getwithvid()  returns with an iocount held on the vnode; this type of reference is intended to be held only for short periods of time (e.g.
+ across a function call) and provides a strong guarantee about the life of the vnode. vnodes with positive iocounts cannot be
+ recycled. An iocount is required for any operation on a vnode.
+ @return 0 for success, ENOENT if the vnode is dead, in the process of being reclaimed, or has been recycled and reused.
+ */
+int    vnode_getwithvid(vnode_t, uint32_t);
+
+#ifdef BSD_KERNEL_PRIVATE
+int vnode_getwithvid_drainok(vnode_t, uint32_t);
+#endif /* BSD_KERNEL_PRIVATE */
+
+/*!
+ @function vnode_getwithref
+ @abstract Increase the iocount on a vnode on which a usecount (persistent reference) is held.
+ @discussion If vnode_getwithref() succeeds, the resulting io-reference must be dropped with vnode_put().
+ vnode_getwithref() will succeed on dead vnodes; it should fail with ENOENT on vnodes which are in the process of being reclaimed.  
+ Because it is only called with a usecount on the vnode, the caller is guaranteed that the vnode has not been 
+ reused for a different file, though it may now be dead and have deadfs vnops (which return errors like EIO, ENXIO, ENOTDIR).
+ On success, vnode_getwithref() returns with an iocount held on the vnode; this type of reference is intended to be held only for short periods of time (e.g.
+ across a function call) and provides a strong guarantee about the life of the vnode. vnodes with positive iocounts cannot be
+ recycled. An iocount is required for any operation on a vnode.
+ @return 0 for success, ENOENT if the vnode is dead, in the process of being reclaimed, or has been recycled and reused.
+ */
+int    vnode_getwithref(vnode_t);
+
+/*!
+ @function vnode_put
+ @abstract Decrement the iocount on a vnode.
+ @discussion vnode_put() is called to indicate that a vnode is no longer in active use.  It removes the guarantee that a
+ vnode will not be recycled.  This routine should be used to release io references no matter how they were obtained.
+ @param vp The vnode whose iocount to drop.
+ @return Always 0.
+ */

 int    vnode_put(vnode_t);
 int    vnode_put(vnode_t);

+
+/*!
+ @function vnode_ref
+ @abstract Increment the usecount on a vnode.
+ @discussion If vnode_ref() succeeds, the resulting usecount must be released with vnode_rele(). vnode_ref() is called to obtain 
+ a persistent reference on a vnode.  This type of reference does not provide the same strong guarantee that a vnode will persist
+ as does an iocount--it merely ensures that a vnode will not be reused to represent a different file.  However, a usecount may be
+ held for extended periods of time, whereas an iocount is intended to be obtained and released quickly as part of performing a
+ vnode operation.  A holder of a usecount must call vnode_getwithref()/vnode_put() in order to perform any operations on that vnode.
+ @param vp The vnode on which to obtain a persistent reference.
+ @return 0 for success; ENOENT if the vnode is dead or in the process of being recycled AND the calling thread is not the vnode owner.
+ */

 int    vnode_ref(vnode_t);
 int    vnode_ref(vnode_t);

+
+/*!
+ @function vnode_rele
+ @abstract Decrement the usecount on a vnode.
+ @discussion vnode_rele() is called to relese a persistent reference on a vnode.  Releasing the last usecount 
+ opens the door for a vnode to be reused as a new file; it also triggers a VNOP_INACTIVE call to the filesystem,
+ though that will not happen immediately if there are outstanding iocount references.
+ @param vp The vnode whose usecount to drop.
+ @return void.
+ */

 void   vnode_rele(vnode_t);
 void   vnode_rele(vnode_t);

+
+/*!
+ @function vnode_isinuse
+ @abstract Determine if the number of persistent (usecount) references on a vnode is greater than a given count.
+ @discussion vnode_isinuse() compares a vnode's  usecount (corresponding to vnode_ref() calls) to its refcnt parameter 
+ (the number of references the caller expects to be on the vnode).  Note that "kusecount" references, corresponding
+ to parties interested only in event notifications, e.g. open(..., O_EVTONLY), are not counted towards the total; the comparison is
+ (usecount - kusecount > recnt).  It is
+ also important to note that the result is only a snapshot; usecounts can change from moment to moment, and the result of vnode_isinuse
+ may no longer be correct the very moment that the caller receives it.
+ @param vp The vnode whose use-status to check.
+ @param refcnt The threshold for saying that a vnode is in use.
+ @return void.
+ */

 int    vnode_isinuse(vnode_t, int);
 int    vnode_isinuse(vnode_t, int);

-void   vnode_lock(vnode_t);
-void   vnode_unlock(vnode_t);
-int            vnode_recycle(vnode_t);
-void   vnode_reclaim(vnode_t);
+
+/*!
+ @function vnode_recycle
+ @abstract Cause a vnode to be reclaimed and prepared for reuse.
+ @discussion Like all vnode KPIs, must be called with an iocount on the target vnode.
+ vnode_recycle() will mark that vnode for reclaim when all existing references are dropped.
+ @param vp The vnode to recycle.
+ @return 1 if the vnode was reclaimed (i.e. there were no existing references), 0 if it was only marked for future reclaim.
+ */
+int    vnode_recycle(vnode_t);
+
+#ifdef KERNEL_PRIVATE
+
+#define        VNODE_EVENT_DELETE              0x00000001      /* file was removed */
+#define        VNODE_EVENT_WRITE               0x00000002      /* file or directory contents changed */
+#define        VNODE_EVENT_EXTEND              0x00000004      /* ubc size increased */
+#define        VNODE_EVENT_ATTRIB              0x00000008      /* attributes changed (suitable for permission changes if type unknown)*/
+#define        VNODE_EVENT_LINK                0x00000010      /* link count changed */
+#define        VNODE_EVENT_RENAME              0x00000020      /* vnode was renamed */
+#define VNODE_EVENT_PERMS              0x00000040      /* permissions changed: will cause a NOTE_ATTRIB */
+#define VNODE_EVENT_FILE_CREATED       0x00000080      /* file created in directory: will cause NOTE_WRITE */
+#define        VNODE_EVENT_DIR_CREATED         0x00000100      /* directory created inside this directory: will cause NOTE_WRITE */
+#define VNODE_EVENT_FILE_REMOVED       0x00000200      /* file removed from this directory: will cause NOTE_WRITE */
+#define        VNODE_EVENT_DIR_REMOVED         0x00000400      /* subdirectory from this directory: will cause NOTE_WRITE */
+
+#ifdef BSD_KERNEL_PRIVATE 
+#define VNODE_NOTIFY_ATTRS             (VNODE_ATTR_BIT(va_fsid) | \
+                                       VNODE_ATTR_BIT(va_fileid)| \
+                                       VNODE_ATTR_BIT(va_mode)  | \
+                                       VNODE_ATTR_BIT(va_uid)   | \
+                                       VNODE_ATTR_BIT(va_gid)   | \
+                                       VNODE_ATTR_BIT(va_dirlinkcount) | \
+                                       VNODE_ATTR_BIT(va_nlink))
+
+                                       
+
+#endif /* BSD_KERNEL_PRIVATE  */
+
+/*!
+ @function vnode_notify
+ @abstract Send a notification up to VFS.  
+ @param vp Vnode for which to provide notification.
+ @param vap Attributes for that vnode, to be passed to fsevents.
+ @discussion Filesystem determines which attributes to pass up using 
+ vfs_get_notify_attributes(&vap).  The most specific events possible should be passed,
+ e.g. VNODE_EVENT_FILE_CREATED on a directory rather than just VNODE_EVENT_WRITE, but
+ a less specific event can be passed up if more specific information is not available.
+ Will not reenter the filesystem.
+ @return 0 for success, else an error code.
+ */ 
+int    vnode_notify(vnode_t, uint32_t, struct vnode_attr*);
+
+/*!
+ @function vnode_ismonitored
+ @abstract Check whether a file has watchers that would make it useful to query a server
+ for file changes.
+ @param vp Vnode to examine.
+ @discussion Will not reenter the filesystem.
+ @return Zero if not monitored, nonzero if monitored.
+ */ 
+int    vnode_ismonitored(vnode_t);
+
+
+/*!
+ @function vnode_isdyldsharedcache
+ @abstract Check whether a file is a dyld shared cache file.
+ @param vp Vnode to examine.
+ @discussion Will not reenter the filesystem.
+ @return nonzero if a dyld shared cache file, zero otherwise.
+ */ 
+int    vnode_isdyldsharedcache(vnode_t);
+
+
+/*!
+ @function vfs_get_notify_attributes
+ @abstract Determine what attributes are required to send up a notification with vnode_notify().
+ @param vap Structure to initialize and activate required attributes on.
+ @discussion Will not reenter the filesystem.
+ @return 0 for success, nonzero for error (currently always succeeds).
+ */ 
+int    vfs_get_notify_attributes(struct vnode_attr *vap);
+
+/*!
+ @function vn_getpath_fsenter
+ @abstract Attempt to get a vnode's path, willing to enter the filesystem.
+ @discussion Paths to vnodes are not always straightforward: a file with multiple hard-links will have multiple pathnames,
+ and it is sometimes impossible to determine a vnode's full path.  vn_getpath_fsenter() may enter the filesystem
+ to try to construct a path, so filesystems should be wary of calling it.
+ @param vp Vnode whose path to get
+ @param pathbuf Buffer in which to store path.
+ @param len Destination for length of resulting path string.  Result will include NULL-terminator in count--that is, "len"
+ will be strlen(pathbuf) + 1.
+ @return 0 for success or an error.
+ */
+int    vn_getpath_fsenter(struct vnode *vp, char *pathbuf, int *len);
+
+#endif /* KERNEL_PRIVATE */

 
 #define        VNODE_UPDATE_PARENT     0x01
 #define        VNODE_UPDATE_NAME       0x02
 #define        VNODE_UPDATE_CACHE      0x04
 
 #define        VNODE_UPDATE_PARENT     0x01
 #define        VNODE_UPDATE_NAME       0x02
 #define        VNODE_UPDATE_CACHE      0x04

-void   vnode_update_identity(vnode_t vp, vnode_t dvp, const char *name, int name_len, int name_hashval, int flags);
-
+#define VNODE_UPDATE_PURGE     0x08
+/*!
+ @function vnode_update_identity
+ @abstract Update vnode data associated with the vfs cache.
+ @discussion The vfs namecache is central to tracking vnode-identifying data and to locating files on the system.  vnode_update_identity()
+ is used to update vnode data associated with the cache. It can set a vnode's parent and/or name (also potentially set by vnode_create())
+ or flush cache data.
+ @param vp The vnode whose information to update.
+ @param dvp Parent to set on the vnode if VNODE_UPDATE_PARENT is used.
+ @param name Name to set in the cache for the vnode if VNODE_UPDATE_NAME is used.  The buffer passed in can be subsequently freed, as the cache
+ does its own name storage.  String should be NULL-terminated unless length and hash value are specified.
+ @param name_len Length of name, if known.  Passing 0 causes the cache to determine the length itself.
+ @param name_hashval Hash value of name, if known.  Passing 0 causes the cache to hash the name itself.
+ @param flags VNODE_UPDATE_PARENT: set parent.  VNODE_UPDATE_NAME: set name.  VNODE_UPDATE_CACHE: flush cache entries for hard links
+ associated with this file.  VNODE_UPDATE_PURGE: flush cache entries for hard links and children of this file.
+ @return void.
+ */
+void   vnode_update_identity(vnode_t vp, vnode_t dvp, const char *name, int name_len, uint32_t name_hashval, int flags);
+
+/*!
+ @function vn_bwrite
+ @abstract System-provided implementation of "bwrite" vnop.
+ @discussion This routine is available for filesystems which do not want to implement their own "bwrite" vnop.  It just calls
+ buf_bwrite() without modifying its arguments.
+ @param ap Standard parameters to a bwrite vnop.
+ @return Results of buf_bwrite directly.
+ */

 int    vn_bwrite(struct vnop_bwrite_args *ap);
 
 int    vn_bwrite(struct vnop_bwrite_args *ap);
 

+/*!
+ @function vnode_authorize
+ @abstract Authorize a kauth-style action on a vnode.
+ @discussion Operations on dead vnodes are always allowed (though never do anything).
+ @param vp Vnode on which to authorize action.
+ @param dvp Parent of "vp," can be NULL.
+ @param action Action to authorize, e.g. KAUTH_VNODE_READ_DATA.  See bsd/sys/kauth.h.
+ @param ctx Context for which to authorize actions.
+ @return EACCESS if permission is denied.  0 if operation allowed.  Various errors from lower layers.
+ */

 int    vnode_authorize(vnode_t /*vp*/, vnode_t /*dvp*/, kauth_action_t, vfs_context_t);
 int    vnode_authorize(vnode_t /*vp*/, vnode_t /*dvp*/, kauth_action_t, vfs_context_t);

+
+/*!
+ @function vnode_authattr
+ @abstract Given a vnode_attr structure, determine what kauth-style actions must be authorized in order to set those attributes.
+ @discussion vnode_authorize requires kauth-style actions; if we want to set a vnode_attr structure on a vnode, we need to translate
+ the set of attributes to a set of kauth-style actions.  This routine will return errors for certain obviously disallowed, or 
+ incoherent, actions.
+ @param vp The vnode on which to authorize action.
+ @param vap Pointer to vnode_attr struct containing desired attributes to set and their values.
+ @param actionp Destination for set of actions to authorize
+ @param ctx Context for which to authorize actions.
+ @return 0 (and a result in "actionp" for success.  Otherwise, an error code.
+ */

 int    vnode_authattr(vnode_t, struct vnode_attr *, kauth_action_t *, vfs_context_t);
 int    vnode_authattr(vnode_t, struct vnode_attr *, kauth_action_t *, vfs_context_t);

+
+/*!
+ @function vnode_authattr_new
+ @abstract Initialize and validate file creation parameters with respect to the current context.
+ @discussion vnode_authattr_new() will fill in unitialized values in the vnode_attr struct with defaults, and will validate the structure
+ with respect to the current context for file creation.
+ @param dvp The directory in which creation will occur.
+ @param vap Pointer to vnode_attr struct containing desired attributes to set and their values.
+ @param noauth If 1, treat the caller as the superuser, i.e. do not check permissions.
+ @param ctx Context for which to authorize actions.
+ @return KAUTH_RESULT_ALLOW for success, an error to indicate invalid or disallowed attributes.
+ */

 int    vnode_authattr_new(vnode_t /*dvp*/, struct vnode_attr *, int /*noauth*/, vfs_context_t);
 int    vnode_authattr_new(vnode_t /*dvp*/, struct vnode_attr *, int /*noauth*/, vfs_context_t);

+
+/*!
+ @function vnode_close
+ @abstract Close a file as opened with vnode_open().
+ @discussion vnode_close() drops the refcount (persistent reference) picked up in vnode_open() and calls down to the filesystem with VNOP_CLOSE.  It should
+ be called with both an iocount and a refcount on the vnode and will drop both.
+ @param vp The vnode to close.
+ @param flags Flags to close: FWASWRITTEN indicates that the file was written to.
+ @param ctx Context against which to validate operation.
+ @return 0 for success or an error from the filesystem.
+ */

 errno_t vnode_close(vnode_t, int, vfs_context_t);
 
 errno_t vnode_close(vnode_t, int, vfs_context_t);
 

+/*!
+ @function vn_getpath
+ @abstract Construct the path to a vnode.
+ @discussion Paths to vnodes are not always straightforward: a file with multiple hard-links will have multiple pathnames,
+ and it is sometimes impossible to determine a vnode's full path.  vn_getpath() will not enter the filesystem.
+ @param vp The vnode whose path to obtain.
+ @param pathbuf Destination for pathname; should be of size MAXPATHLEN
+ @param len Destination for length of resulting path string.  Result will include NULL-terminator in count--that is, "len"
+ will be strlen(pathbuf) + 1.
+ @return 0 for success or an error code.
+ */

 int vn_getpath(struct vnode *vp, char *pathbuf, int *len);
 int vn_getpath(struct vnode *vp, char *pathbuf, int *len);

-int vn_getcdhash(struct vnode *vp, off_t offset, unsigned char *cdhash);

 
 /*
  * Flags for the vnode_lookup and vnode_open
  */
 #define VNODE_LOOKUP_NOFOLLOW          0x01
 #define        VNODE_LOOKUP_NOCROSSMOUNT       0x02
 
 /*
  * Flags for the vnode_lookup and vnode_open
  */
 #define VNODE_LOOKUP_NOFOLLOW          0x01
 #define        VNODE_LOOKUP_NOCROSSMOUNT       0x02

-#define VNODE_LOOKUP_DOWHITEOUT                0x04
-
+/*!
+ @function vnode_lookup
+ @abstract Convert a path into a vnode.
+ @discussion This routine is a thin wrapper around xnu-internal lookup routines; if successful, 
+ it returns with an iocount held on the resulting vnode which must be dropped with vnode_put().
+ @param path Path to look up.
+ @param flags VNODE_LOOKUP_NOFOLLOW: do not follow symbolic links.  VNODE_LOOKUP_NOCROSSMOUNT: do not cross mount points.
+ @return Results 0 for success or an error code.
+ */

 errno_t vnode_lookup(const char *, int, vnode_t *, vfs_context_t);
 errno_t vnode_lookup(const char *, int, vnode_t *, vfs_context_t);

+
+/*!
+ @function vnode_open
+ @abstract Open a file identified by a path--roughly speaking an in-kernel open(2).
+ @discussion If vnode_open() succeeds, it returns with both an iocount and a usecount on the returned vnode.  These must 
+ be released eventually; the iocount should be released with vnode_put() as soon as any initial operations
+ on the vnode are over, whereas the usecount should be released via vnode_close().
+ @param path Path to look up.
+ @param fmode e.g. O_NONBLOCK, O_APPEND; see bsd/sys/fcntl.h.
+ @param cmode Permissions with which to create file if it does not exist.
+ @param flags Same as vnode_lookup().
+ @param vpp Destination for vnode.
+ @param ctx Context with which to authorize open/creation.
+ @return 0 for success or an error code.
+ */

 errno_t vnode_open(const char *, int, int, int, vnode_t *, vfs_context_t);
 
 /*
  * exported vnode operations
  */
 
 errno_t vnode_open(const char *, int, int, int, vnode_t *, vfs_context_t);
 
 /*
  * exported vnode operations
  */
 

+/*!
+ @function vnode_iterate
+ @abstract Perform an operation on (almost) all vnodes from a given mountpoint.
+ @param mp Mount whose vnodes to operate on.
+ @param flags
+ VNODE_RELOAD                  Mark inactive vnodes for recycle.
+ VNODE_WAIT                    
+ VNODE_WRITEABLE               Only examine vnodes with writes in progress.
+ VNODE_WITHID                  No effect.
+ VNODE_NOLOCK_INTERNAL No effect.
+ VNODE_NODEAD                  No effect.
+ VNODE_NOSUSPEND               No effect.
+ VNODE_ITERATE_ALL             No effect.
+ VNODE_ITERATE_ACTIVE  No effect.
+ VNODE_ITERATE_INACTIVE        No effect.
+ 
+ @param callout Function to call on each vnode.
+ @param arg Argument which will be passed to callout along with each vnode.
+ @return Zero for success, else an error code.  Will return 0 immediately if there are no vnodes hooked into the mount.
+ @discussion Skips vnodes which are dead, in the process of reclaim, suspended, or of type VNON.
+ */

 int    vnode_iterate(struct mount *, int, int (*)(struct vnode *, void *), void *);
 int    vnode_iterate(struct mount *, int, int (*)(struct vnode *, void *), void *);

+

 /*
  * flags passed into vnode_iterate
  */
 /*
  * flags passed into vnode_iterate
  */


@@ -662,6 +1708,10 @@ int       vnode_iterate(struct mount *, int, int (*)(struct vnode *, void *), void *);
 #define VNODE_ITERATE_ALL              0x80
 #define VNODE_ITERATE_ACTIVE   0x100
 #define VNODE_ITERATE_INACTIVE 0x200
 #define VNODE_ITERATE_ALL              0x80
 #define VNODE_ITERATE_ACTIVE   0x100
 #define VNODE_ITERATE_INACTIVE 0x200

+#ifdef BSD_KERNEL_PRIVATE
+#define VNODE_ALWAYS           0x400
+#define VNODE_DRAINO           0x800
+#endif /* BSD_KERNEL_PRIVATE */

 
 /*
  * return values from callback
 
 /*
  * return values from callback


@@ -671,36 +1721,318 @@ int     vnode_iterate(struct mount *, int, int (*)(struct vnode *, void *), void *);
 #define VNODE_CLAIMED          2       /* don't drop reference */
 #define VNODE_CLAIMED_DONE     3       /* don't drop reference, terminate iteration */
 
 #define VNODE_CLAIMED          2       /* don't drop reference */
 #define VNODE_CLAIMED_DONE     3       /* don't drop reference, terminate iteration */
 

-
-#ifdef BSD_KERNEL_PRIVATE
-/* Not in export list so can be private */
-struct stat;
-int    vn_stat(struct vnode *vp, void * sb, kauth_filesec_t *xsec, int isstat64, vfs_context_t ctx);
-int    vn_stat_noauth(struct vnode *vp, void * sb, kauth_filesec_t *xsec, int isstat64, vfs_context_t ctx);
-int    vaccess(mode_t file_mode, uid_t uid, gid_t gid,
-                       mode_t acc_mode, kauth_cred_t cred);
-#endif /* BSD_KERNEL_PRIVATE */
-
+/*!
+ @function vn_revoke
+ @abstract Invalidate all references to a vnode.
+ @discussion Reclaims the vnode, giving it deadfs vnops (though not halting operations which are already in progress).  
+ Also reclaims all aliased vnodes (important for devices).  People holding usecounts on the vnode, e.g. processes
+ with the file open, will find that all subsequent operations but closing the file fail.
+ @param vp The vnode to revoke.
+ @param flags Unused.
+ @param ctx Context against which to validate operation.
+ @return 0 always.
+ */

 int    vn_revoke(vnode_t vp, int flags, vfs_context_t);
 
 int    vn_revoke(vnode_t vp, int flags, vfs_context_t);
 

-

 /* namecache function prototypes */
 /* namecache function prototypes */

+/*!
+ @function cache_lookup
+ @abstract Check for a filename in a directory using the VFS name cache.
+ @discussion cache_lookup() will flush negative cache entries and return 0 if the operation of the cn_nameiop is CREATE or RENAME.
+ Often used from the filesystem during a lookup vnop.  The filesystem will be called to if there is a negative cache entry for a file,
+ so it can make sense to initially check for negative entries (and possibly lush them).
+ @param dvp Directory in which lookup is occurring.
+ @param vpp Destination for vnode pointer.
+ @param cnp Various data about lookup, e.g. filename and intended operation.
+ @return ENOENT: the filesystem has previously added a negative entry with cache_enter() to indicate that there is no
+ file of the given name in "dp."  -1: successfully found a cached vnode (vpp is set).  0: No data in the cache, or operation is CRETE/RENAME.
+ */

 int    cache_lookup(vnode_t dvp, vnode_t *vpp, struct componentname *cnp);
 int    cache_lookup(vnode_t dvp, vnode_t *vpp, struct componentname *cnp);

+
+/*!
+ @function cache_enter
+ @abstract Add a (name,vnode) entry to the VFS namecache.
+ @discussion Generally used to add a cache entry after a successful filesystem-level lookup or to add a 
+ negative entry after one which did not find its target.
+ @param dvp Directory in which file lives.
+ @param vp File to add to cache. A non-NULL vp is stored for rapid access; a NULL vp indicates 
+ that there is no such file in the directory and speeds future failed lookups.
+ @param cnp Various data about lookup, e.g. filename and intended operation.
+ @return void.  
+ */

 void   cache_enter(vnode_t dvp, vnode_t vp, struct componentname *cnp);
 void   cache_enter(vnode_t dvp, vnode_t vp, struct componentname *cnp);

+
+/*!
+ @function cache_purge
+ @abstract Remove all data relating to a vnode from the namecache.
+ @discussion Will flush all hardlinks to the vnode as well as all children (should any exist).  Logical 
+ to use when cached data about a vnode becomes invalid, for instance in an unlink.
+ @param vp The vnode to purge.
+ @return void.  
+ */

 void   cache_purge(vnode_t vp);
 void   cache_purge(vnode_t vp);

+
+/*!
+ @function cache_purge_negatives
+ @abstract Remove all negative cache entries which are children of a given vnode.
+ @discussion Appropriate to use when negative cache information for a directory could have
+ become invalid, e.g. after file creation.
+ @param vp The vnode whose negative children to purge.
+ @return void.  
+ */

 void   cache_purge_negatives(vnode_t vp);
 
 void   cache_purge_negatives(vnode_t vp);
 

+

 /*
  * Global string-cache routines.  You can pass zero for nc_hash
  * if you don't know it (add_name() will then compute the hash).
  * There are no flags for now but maybe someday.
  */
 /*
  * Global string-cache routines.  You can pass zero for nc_hash
  * if you don't know it (add_name() will then compute the hash).
  * There are no flags for now but maybe someday.
  */

-const char *vfs_addname(const char *name, size_t len, u_int nc_hash, u_int flags);
+/*!
+ @function vfs_addname
+ @abstract Deprecated
+ @discussion vnode_update_identity() and vnode_create() make vfs_addname() unnecessary for kexts.
+ */
+const char *vfs_addname(const char *name, uint32_t len, uint32_t nc_hash, uint32_t flags);
+
+/*!
+ @function vfs_removename
+ @abstract Deprecated
+ @discussion vnode_update_identity() and vnode_create() make vfs_addname() unnecessary for kexts.
+ */

 int   vfs_removename(const char *name);
 
 int   vfs_removename(const char *name);
 

-int    check_mountedon(dev_t dev, enum vtype type, int  *errorp);
+/*!
+ @function vcount
+ @abstract Count total references to a given file, disregarding "kusecount" (event listener, as with O_EVTONLY) references.
+ @discussion For a regular file, just return (usecount-kusecount); for device files, return the sum over all
+ vnodes 'v' which reference that device of (usecount(v) - kusecount(v)).  Note that this is merely a snapshot and could be
+ invalid by the time the caller checks the result.
+ @param vp The vnode whose references to count.
+ @return Count of references.
+ */

 int    vcount(vnode_t vp);
 
 int    vcount(vnode_t vp);
 

+/*!
+ @function vn_path_package_check
+ @abstract Figure out if a path corresponds to a Mac OS X package.
+ @discussion  Determines if the extension on a path is a known OS X extension type.
+ @param vp Unused.
+ @param path Path to check.
+ @param pathlen Size of path buffer.
+ @param component Set to index of start of last path component if the path is found to be a package. Set to -1 if
+ the path is not a known package type.
+ @return 0 unless some parameter was invalid, in which case EINVAL is returned.  Determine package-ness by checking
+ what *component is set to.
+ */
+int vn_path_package_check(vnode_t vp, char *path, int pathlen, int *component);
+
+#ifdef KERNEL_PRIVATE
+/*!
+  @function vn_searchfs_inappropriate_name
+  @abstract Figure out if the component is inappropriate for a SearchFS query.
+  @param name component to check
+  @param len length of component.
+  @return 0 if no match, 1 if inappropriate. 
+ */
+int vn_searchfs_inappropriate_name(const char *name, int len); 
+#endif 
+
+/*!
+ @function vn_rdwr
+ @abstract Read from or write to a file.
+ @discussion vn_rdwr() abstracts the details of constructing a uio and picking a vnode operation to allow
+ simple in-kernel file I/O.
+ @param rw UIO_READ for a read, UIO_WRITE for a write.
+ @param vp The vnode on which to perform I/O.
+ @param base Start of buffer into which to read or from which to write data.
+ @param len Length of buffer.
+ @param offset Offset within the file at which to start I/O.
+ @param segflg What kind of address "base" is.   See uio_seg definition in sys/uio.h.  UIO_SYSSPACE for kernelspace, UIO_USERSPACE for userspace.
+ UIO_USERSPACE32 and UIO_USERSPACE64 are in general preferred, but vn_rdwr will make sure that has the correct address sizes.
+ @param ioflg Defined in vnode.h, e.g. IO_NOAUTH, IO_NOCACHE.
+ @param cred Credential to pass down to filesystem for authentication.
+ @param aresid Destination for amount of requested I/O which was not completed, as with uio_resid().
+ @param p Process requesting I/O.
+ @return 0 for success; errors from filesystem, and EIO if did not perform all requested I/O and the "aresid" parameter is NULL.
+ */
+int    vn_rdwr(enum uio_rw, vnode_t, caddr_t, int, off_t, enum uio_seg, int, kauth_cred_t, int *, proc_t);
+
+/*!
+ @function vnode_getname
+ @abstract Get the name of a vnode from the VFS namecache.
+ @discussion Not all vnodes have names, and vnode names can change (notably, hardlinks).  Use this routine at your own risk.
+ The string is returned with a refcount incremented in the cache; callers must call vnode_putname() to release that reference.
+ @param vp The vnode whose name to grab.
+ @return The name, or NULL if unavailable.
+ */
+const char     *vnode_getname(vnode_t vp);
+
+/*!
+ @function vnode_putname
+ @abstract Release a reference on a name from the VFS cache.
+ @discussion Should be called on a string obtained with vnode_getname().
+ @param name String to release.
+ @return void.
+ */
+void   vnode_putname(const char *name);
+
+/*!
+ @function vnode_getparent
+ @abstract Get an iocount on the parent of a vnode.
+ @discussion A vnode's parent may change over time or be reclaimed, so vnode_getparent() may return different
+ results at different times (e.g. a multiple-hardlink file). The parent is returned with an iocount which must
+ subsequently be dropped with vnode_put().
+ @param vp The vnode whose parent to grab.
+ @return Parent if available, else NULL.
+ */
+vnode_t        vnode_getparent(vnode_t vp);
+
+/*!
+ @function vnode_setdirty
+ @abstract Mark the vnode as having data or metadata that needs to be written out during reclaim
+ @discussion The vnode should be marked as dirty anytime a file system defers flushing of data or meta-data associated with it. 
+ @param the vnode to mark as dirty
+ @return 0 if successful else an error code.
+ */
+int    vnode_setdirty(vnode_t);
+
+/*!
+ @function vnode_cleardirty
+ @abstract Mark the vnode as clean i.e. all its data or metadata has been flushed
+ @discussion The vnode should be marked as clean whenever the file system is done flushing data or meta-data associated with it.
+ @param the vnode to clear as being dirty
+ @return 0 if successful else an error code.
+ */
+int    vnode_cleardirty(vnode_t);
+
+/*!
+ @function vnode_isdirty
+ @abstract Determine if a vnode is marked dirty.
+ @discussion The vnode should be marked as clean whenever the file system is done flushing data or meta-data associated with it.
+ @param vp the vnode to test.
+ @return Non-zero if the vnode is dirty, 0 otherwise.
+ */
+int    vnode_isdirty(vnode_t);
+
+
+
+#ifdef KERNEL_PRIVATE
+/*! 
+ @function vnode_lookup_continue_needed
+ @abstract Determine whether vnode needs additional processing in VFS before being opened.
+ @discussion If result is zero, filesystem can open this vnode.  If result is nonzero,
+ additional processing is needed in VFS (e.g. symlink, mountpoint).  Nonzero results should
+ be passed up to VFS.
+ @param vp Vnode to consider opening (found by filesystem).
+ @param cnp Componentname as passed to filesystem from VFS.
+ @result 0 to indicate that a vnode can be opened, or an error that should be passed up to VFS.
+ */
+int vnode_lookup_continue_needed(vnode_t vp, struct componentname *cnp);
+
+/*!
+ @function vnode_istty
+ @abstract Determine if the given vnode represents a tty device.
+ @param vp Vnode to examine.
+ @result Non-zero to indicate that the vnode represents a tty device. Zero otherwise.
+ */
+int vnode_istty(vnode_t vp);
+#endif /* KERNEL_PRIVATE */
+
+#ifdef BSD_KERNEL_PRIVATE
+/* Not in export list so can be private */
+struct stat;
+int    vn_stat(struct vnode *vp, void * sb, kauth_filesec_t *xsec, int isstat64, vfs_context_t ctx);
+int    vn_stat_noauth(struct vnode *vp, void * sb, kauth_filesec_t *xsec, int isstat64, vfs_context_t ctx);
+int    vaccess(mode_t file_mode, uid_t uid, gid_t gid,
+                       mode_t acc_mode, kauth_cred_t cred);
+int    check_mountedon(dev_t dev, enum vtype type, int  *errorp);
+int vn_getcdhash(struct vnode *vp, off_t offset, unsigned char *cdhash);
+void   vnode_reclaim(vnode_t);
+vfs_context_t vfs_context_kernel(void);                /* get from 1st kernel thread */
+int    vfs_context_issuser(vfs_context_t);
+vnode_t vfs_context_cwd(vfs_context_t);
+vnode_t        current_rootdir(void);
+vnode_t        current_workingdir(void);
+void   *vnode_vfsfsprivate(vnode_t);
+struct vfsstatfs *vnode_vfsstatfs(vnode_t);
+uint32_t vnode_vfsvisflags(vnode_t);
+uint32_t vnode_vfscmdflags(vnode_t);
+int    vnode_is_openevt(vnode_t);
+void   vnode_set_openevt(vnode_t);
+void   vnode_clear_openevt(vnode_t);
+int    vnode_isstandard(vnode_t);
+int    vnode_makeimode(int, int);
+enum vtype     vnode_iftovt(int);
+int    vnode_vttoif(enum vtype);
+int    vnode_isshadow(vnode_t);
+boolean_t vnode_on_reliable_media(vnode_t);
+/*
+ * Indicate that a file has multiple hard links.  VFS will always call
+ * VNOP_LOOKUP on this vnode.  Volfs will always ask for it's parent
+ * object ID (instead of using the v_parent pointer).
+ */
+vnode_t vnode_parent(vnode_t);
+void vnode_setparent(vnode_t, vnode_t);
+/*!
+ @function vnode_getname_printable
+ @abstract Get a non-null printable name of a vnode.
+ @Used to make sure a printable name is returned for all vnodes. If a name exists or can be artificially created, the routine creates a new entry in the VFS namecache. Otherwise, the function returns an artificially created vnode name which is safer and easier to use. vnode_putname_printable() should be used to release names obtained by this routine. 
+ @param vp The vnode whose name to grab.
+ @return The printable name.
+ */
+const char *vnode_getname_printable(vnode_t vp);
+
+/*!
+ @function vnode_putname_printable
+ @abstract Release a reference on a name from the VFS cache if it was added by the matching vnode_getname_printable() call.
+ @param name String to release.
+ @return void.
+ */
+void vnode_putname_printable(const char *name);
+void vnode_setname(vnode_t, char *);
+int vnode_isnoflush(vnode_t);
+void vnode_setnoflush(vnode_t);
+void vnode_clearnoflush(vnode_t);
+/* XXX temporary until we can arrive at a KPI for NFS, Seatbelt */
+thread_t vfs_context_thread(vfs_context_t);
+#if CONFIG_IOSCHED
+vnode_t vnode_mountdevvp(vnode_t);
+#endif
+#endif /* BSD_KERNEL_PRIVATE */
+
+/*
+ * Helper functions for implementing VNOP_GETATTRLISTBULK for a filesystem
+ */
+
+/*!
+ @function vfs_setup_vattr_from_attrlist
+ @abstract Setup a vnode_attr structure given an attrlist structure.
+ @Used by a VNOP_GETATTRLISTBULK implementation to setup a vnode_attr structure from a attribute list. It also returns the fixed size of the attribute buffer required.
+ @param alp Pointer to attribute list structure.
+ @param vap Pointer to vnode_attr structure.
+ @param obj_vtype Type of object - If VNON is passed, then the type is ignored and common, file and dir attrs are used to initialise the vattrs. If set to VDIR, only common and directory attributes are used. For all other types, only common and file attrbutes are used.
+ @param attr_fixed_sizep. Returns the fixed length required in the attrbute buffer for the object. NULL should be passed if it is not required.
+ @param ctx vfs context of caller.
+ @return error.
+ */
+errno_t vfs_setup_vattr_from_attrlist(struct attrlist * /* alp */, struct vnode_attr * /* vap */, enum vtype /* obj_vtype */, ssize_t * /* attr_fixed_sizep */, vfs_context_t /* ctx */);
+
+/*!
+ @function vfs_attr_pack
+ @abstract Pack a vnode_attr structure into a buffer in the same format as getattrlist(2).
+ @Used by a VNOP_GETATTRLISTBULK implementation to pack data provided into a vnode_attr structure into a buffer the way getattrlist(2) does.
+ @param vp If available, the vnode for which the attributes are being given, NULL if vnode is not available (which will usually be the case for a VNOP_GETATTRLISTBULK implementation.
+ @param auio - a uio_t initialised with one iovec..
+ @param alp - Pointer to an attrlist structure.
+ @param options - options for call (same as options for getattrlistbulk(2)).
+ @param vap Pointer to a filled in vnode_attr structure. Data from the vnode_attr structure will be used to copy and lay out the data in the required format for getatrlistbulk(2) by this function.
+ @param fndesc Currently unused
+ @param ctx vfs context of caller.
+ @return error.
+ */
+errno_t vfs_attr_pack(vnode_t /* vp */, uio_t /* uio */, struct attrlist * /* alp */, uint64_t /* options */, struct vnode_attr * /* vap */, void * /* fndesc */, vfs_context_t /* ctx */);
+

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