--- /dev/null
+/*
+ * Copyright (c) 2016 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/*-
+ * Portions Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software donated to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)null.h 8.3 (Berkeley) 8/20/94
+ *
+ * $FreeBSD$
+ */
+
+#ifndef FS_NULL_H
+#define FS_NULL_H
+
+#include <sys/appleapiopts.h>
+#include <libkern/libkern.h>
+#include <sys/vnode.h>
+#include <sys/vnode_if.h>
+#include <sys/ubc.h>
+#include <vfs/vfs_support.h>
+#include <sys/lock.h>
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <sys/syslimits.h>
+
+#if KERNEL
+#include <libkern/tree.h>
+#else
+#include <System/libkern/tree.h>
+#endif
+
+//#define NULLFS_DEBUG 0
+
+#define NULLM_CACHE 0x0001
+#define NULLM_CASEINSENSITIVE 0x0000000000000002
+
+typedef int (*vop_t)(void *);
+
+struct null_mount {
+ struct vnode * nullm_rootvp; /* Reference to root null_node (inode 1) */
+ struct vnode * nullm_secondvp; /* Reference to virtual directory vnode to wrap app
+ bundles (inode 2) */
+ struct vnode * nullm_thirdcovervp; /* Reference to vnode that covers
+ lowerrootvp (inode 3) */
+ struct vnode * nullm_lowerrootvp; /* reference to the root of the tree we are
+ relocating (in the other file system) */
+ uint32_t nullm_lowerrootvid; /* store the lower root vid so we can check
+ before we build the shadow vnode lazily*/
+ lck_mtx_t nullm_lock; /* lock to protect vps above */
+ uint64_t nullm_flags;
+};
+
+#ifdef KERNEL
+
+#define NULL_FLAG_HASHED 0x000000001
+
+/*
+ * A cache of vnode references
+ */
+struct null_node {
+ LIST_ENTRY(null_node) null_hash; /* Hash list */
+ struct vnode * null_lowervp; /* VREFed once */
+ struct vnode * null_vnode; /* Back pointer */
+ uint32_t null_lowervid; /* vid for lowervp to detect lowervp getting recycled out
+ from under us */
+ uint32_t null_myvid;
+ uint32_t null_flags;
+};
+
+struct vnodeop_desc_fake {
+ int vdesc_offset;
+ const char * vdesc_name;
+ /* other stuff */
+};
+
+#define NULLV_NOUNLOCK 0x0001
+#define NULLV_DROP 0x0002
+
+#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)(vfs_fsprivate(mp)))
+#define VTONULL(vp) ((struct null_node *)vnode_fsnode(vp))
+#define NULLTOV(xp) ((xp)->null_vnode)
+
+__BEGIN_DECLS
+
+int nullfs_init(struct vfsconf * vfsp);
+int nullfs_init_lck(lck_mtx_t * lck);
+int nullfs_destroy_lck(lck_mtx_t * lck);
+int nullfs_uninit(void);
+int null_nodeget(
+ struct mount * mp, struct vnode * lowervp, struct vnode * dvp, struct vnode ** vpp, struct componentname * cnp, int root);
+int null_hashget(struct mount * mp, struct vnode * lowervp, struct vnode ** vpp);
+int null_getnewvnode(
+ struct mount * mp, struct vnode * lowervp, struct vnode * dvp, struct vnode ** vpp, struct componentname * cnp, int root);
+void null_hashrem(struct null_node * xp);
+
+#define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
+#define NULLVPTOLOWERVID(vp) (VTONULL(vp)->null_lowervid)
+#define NULLVPTOMYVID(vp) (VTONULL(vp)->null_myvid)
+
+extern struct vnodeopv_desc nullfs_vnodeop_opv_desc;
+
+extern vop_t * nullfs_vnodeop_p;
+
+// int nullfs_install_filesys(void);
+// int nullfs_uninstall_filesys(void);
+
+__END_DECLS
+
+#ifdef NULLFS_DEBUG
+#define NULLFSDEBUG(format, args...) printf(format, ##args)
+#else
+#define NULLFSDEBUG(format, args...)
+#endif /* NULLFS_DEBUG */
+
+#endif /* KERNEL */
+
+#endif
\ No newline at end of file
projects / apple / xnu.git / blobdiff