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Cider Isn't Darwin Emulation, Really
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C
at android
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201/* * Copyright (c) 1999-2008 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_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. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ *//* * File: ubc.h * Author: Umesh Vaishampayan [umeshv@apple.com] * 05-Aug-1999 umeshv Created. * * Header file for Unified Buffer Cache. * */
#ifndef _SYS_UBC_INTERNAL_H_#define _SYS_UBC_INTERNAL_H_
#include <sys/appleapiopts.h>#include <sys/types.h>#include <sys/kernel_types.h>#include <sys/ucred.h>#include <sys/vnode.h>#include <sys/ubc.h>#include <sys/mman.h>
#include <sys/cdefs.h>
#include <kern/locks.h>#include <mach/memory_object_types.h>
#include <libkern/crypto/sha1.h>
#define UBC_INFO_NULL ((struct ubc_info *) 0)
extern struct zone *ubc_info_zone;
/* * Maximum number of vfs clusters per vnode */#define MAX_CLUSTERS CONFIG_MAX_CLUSTERS
#define SPARSE_PUSH_LIMIT 4 /* limit on number of concurrent sparse pushes outside of the cl_lockw */ /* once we reach this limit, we'll hold the lock */
struct cl_extent { daddr64_t b_addr; daddr64_t e_addr;};
struct cl_wextent { daddr64_t b_addr; daddr64_t e_addr; int io_flags;};
struct cl_readahead { lck_mtx_t cl_lockr; daddr64_t cl_lastr; /* last block read by client */ daddr64_t cl_maxra; /* last block prefetched by the read ahead */ int cl_ralen; /* length of last prefetch */};
struct cl_writebehind { lck_mtx_t cl_lockw; void * cl_scmap; /* pointer to sparse cluster map */ off_t cl_last_write; /* offset of the end of the last write */ off_t cl_seq_written; /* sequentially written bytes */ int cl_sparse_pushes; /* number of pushes outside of the cl_lockw in progress */ int cl_sparse_wait; /* synchronous push is in progress */ int cl_number; /* number of packed write behind clusters currently valid */ struct cl_wextent cl_clusters[MAX_CLUSTERS]; /* packed write behind clusters */};
struct cs_blob { struct cs_blob *csb_next; cpu_type_t csb_cpu_type; unsigned int csb_flags; off_t csb_base_offset; /* Offset of Mach-O binary in fat binary */ off_t csb_start_offset; /* Blob coverage area start, from csb_base_offset */ off_t csb_end_offset; /* Blob coverage area end, from csb_base_offset */ ipc_port_t csb_mem_handle; vm_size_t csb_mem_size; vm_offset_t csb_mem_offset; vm_address_t csb_mem_kaddr; unsigned char csb_sha1[SHA1_RESULTLEN];};
/* * The following data structure keeps the information to associate * a vnode to the correspondig VM objects. */struct ubc_info { memory_object_t ui_pager; /* pager */ memory_object_control_t ui_control; /* VM control for the pager */ uint32_t ui_flags; /* flags */ vnode_t ui_vnode; /* vnode for this ubc_info */ kauth_cred_t ui_ucred; /* holds credentials for NFS paging */ off_t ui_size; /* file size for the vnode */
struct cl_readahead *cl_rahead; /* cluster read ahead context */ struct cl_writebehind *cl_wbehind; /* cluster write behind context */
struct cs_blob *cs_blobs; /* for CODE SIGNING */#if CHECK_CS_VALIDATION_BITMAP void *cs_valid_bitmap; /* right now: used only for signed files on the read-only root volume */ uint64_t cs_valid_bitmap_size; /* Save original bitmap size in case the file size changes. * In the future, we may want to reconsider changing the * underlying bitmap to reflect the new file size changes. */#endif /* CHECK_CS_VALIDATION_BITMAP */};
/* Defines for ui_flags */#define UI_NONE 0x00000000 /* none */#define UI_HASPAGER 0x00000001 /* has a pager associated */#define UI_INITED 0x00000002 /* newly initialized vnode */#define UI_HASOBJREF 0x00000004 /* hold a reference on object */#define UI_WASMAPPED 0x00000008 /* vnode was mapped */#define UI_ISMAPPED 0x00000010 /* vnode is currently mapped */#define UI_MAPBUSY 0x00000020 /* vnode is being mapped or unmapped */#define UI_MAPWAITING 0x00000040 /* someone waiting for UI_MAPBUSY */
/* * exported primitives for loadable file systems. */
__BEGIN_DECLS__private_extern__ void ubc_init(void) __attribute__((section("__TEXT, initcode")));;__private_extern__ int ubc_umount(mount_t mp);__private_extern__ void ubc_unmountall(void);__private_extern__ memory_object_t ubc_getpager(vnode_t);__private_extern__ void ubc_destroy_named(vnode_t);
/* internal only */__private_extern__ void cluster_release(struct ubc_info *);__private_extern__ uint32_t cluster_max_io_size(mount_t, int);__private_extern__ uint32_t cluster_hard_throttle_limit(vnode_t, uint32_t *, uint32_t);
/* Flags for ubc_getobject() */#define UBC_FLAGS_NONE 0x0000#define UBC_HOLDOBJECT 0x0001#define UBC_FOR_PAGEOUT 0x0002
memory_object_control_t ubc_getobject(vnode_t, int);boolean_t ubc_strict_uncached_IO(vnode_t);
int ubc_info_init(vnode_t);int ubc_info_init_withsize(vnode_t, off_t);void ubc_info_deallocate(struct ubc_info *);
int ubc_isinuse(vnode_t, int);int ubc_isinuse_locked(vnode_t, int, int);
int ubc_getcdhash(vnode_t, off_t, unsigned char *);
#ifdef XNU_KERNEL_PRIVATEint UBCINFOEXISTS(vnode_t);#endif /* XNU_KERNEL_PRIVATE */
/* code signing */struct cs_blob;int ubc_cs_blob_add(vnode_t, cpu_type_t, off_t, vm_address_t, vm_size_t);struct cs_blob *ubc_get_cs_blobs(vnode_t);int ubc_cs_getcdhash(vnode_t, off_t, unsigned char *);kern_return_t ubc_cs_blob_allocate(vm_offset_t *, vm_size_t *);void ubc_cs_blob_deallocate(vm_offset_t, vm_size_t);
kern_return_t ubc_cs_validation_bitmap_allocate( vnode_t );void ubc_cs_validation_bitmap_deallocate( vnode_t );__END_DECLS
#endif /* _SYS_UBC_INTERNAL_H_ */