174 lines
5.9 KiB
C
174 lines
5.9 KiB
C
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/*
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* Copyright (c) 2016 Apple Inc. All rights reserved.
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*/
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/*-
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* Portions Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)null.h 8.3 (Berkeley) 8/20/94
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*
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* $FreeBSD$
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*/
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#ifndef FS_NULL_H
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#define FS_NULL_H
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#include <sys/appleapiopts.h>
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#include <libkern/libkern.h>
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#include <sys/vnode.h>
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#include <sys/vnode_if.h>
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#include <sys/ubc.h>
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#include <vfs/vfs_support.h>
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#include <sys/lock.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/syslimits.h>
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#if KERNEL
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#include <libkern/tree.h>
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#else
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#include <System/libkern/tree.h>
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#endif
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// #define NULLFS_DEBUG 0
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#define NULLM_CACHE 0x0001
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#define NULLM_CASEINSENSITIVE 0x0000000000000002
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#define NULLM_UNVEIL 0x1ULL << 2
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typedef int (*vop_t)(void *);
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struct null_mount {
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struct vnode * nullm_rootvp; /* Reference to root null_node (inode 1) */
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struct vnode * nullm_secondvp; /* Reference to virtual directory vnode to wrap app
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* bundles (inode 2) */
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struct vnode * nullm_lowerrootvp; /* reference to the root of the tree we are
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* relocating (in the other file system) */
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uint32_t nullm_lowerrootvid; /* store the lower root vid so we can check
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* before we build the shadow vnode lazily*/
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lck_mtx_t nullm_lock; /* lock to protect rootvp and secondvp above */
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uint64_t nullm_flags;
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uid_t uid;
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gid_t gid;
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};
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struct null_mount_conf {
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uint64_t flags;
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};
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#ifdef KERNEL
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#define NULL_FLAG_HASHED 0x000000001
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/*
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* A cache of vnode references
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*/
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struct null_node {
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LIST_ENTRY(null_node) null_hash; /* Hash list */
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struct vnode * null_lowervp; /* VREFed once */
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struct vnode * null_vnode; /* Back pointer */
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uint32_t null_lowervid; /* vid for lowervp to detect lowervp getting recycled out
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* from under us */
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uint32_t null_myvid;
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uint32_t null_flags;
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};
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struct vnodeop_desc_fake {
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int vdesc_offset;
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const char * vdesc_name;
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/* other stuff */
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};
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#define NULLV_NOUNLOCK 0x0001
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#define NULLV_DROP 0x0002
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#define MOUNTTONULLMOUNT(mp) ((struct null_mount *)(vfs_fsprivate(mp)))
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#define VTONULL(vp) ((struct null_node *)vnode_fsnode(vp))
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#define NULLTOV(xp) ((xp)->null_vnode)
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__BEGIN_DECLS
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int nullfs_init(struct vfsconf * vfsp);
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void nullfs_init_lck(lck_mtx_t * lck);
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void nullfs_destroy_lck(lck_mtx_t * lck);
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int nullfs_uninit(void);
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int null_nodeget(
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struct mount * mp, struct vnode * lowervp, struct vnode * dvp, struct vnode ** vpp, struct componentname * cnp, int root);
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int null_hashget(struct mount * mp, struct vnode * lowervp, struct vnode ** vpp);
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int null_getnewvnode(
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struct mount * mp, struct vnode * lowervp, struct vnode * dvp, struct vnode ** vpp, struct componentname * cnp, int root);
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void null_hashrem(struct null_node * xp);
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int nullfs_getbackingvnode(vnode_t in_vp, vnode_t* out_vpp);
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vfs_context_t nullfs_get_patched_context(struct null_mount * null_mp, vfs_context_t ctx);
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void nullfs_cleanup_patched_context(struct null_mount * null_mp, vfs_context_t ctx);
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#define NULLVPTOLOWERVP(vp) (VTONULL(vp)->null_lowervp)
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#define NULLVPTOLOWERVID(vp) (VTONULL(vp)->null_lowervid)
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#define NULLVPTOMYVID(vp) (VTONULL(vp)->null_myvid)
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extern const struct vnodeopv_desc nullfs_vnodeop_opv_desc;
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extern vop_t * nullfs_vnodeop_p;
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__END_DECLS
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#ifdef NULLFS_DEBUG
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#define NULLFSDEBUG(format, args...) printf(format, ##args)
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#else
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#define NULLFSDEBUG(format, args...)
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#endif /* NULLFS_DEBUG */
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#endif /* KERNEL */
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#endif
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