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Cider Isn't Darwin Emulation, Really
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320/* * Copyright (c) 2000-2012 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@ *//* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved *//* * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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. * * @(#)buf.h 8.9 (Berkeley) 3/30/95 */
#ifndef _SYS_BUF_INTERNAL_H_#define _SYS_BUF_INTERNAL_H_
#include <sys/appleapiopts.h>
#ifdef KERNEL#include <sys/queue.h>#include <sys/errno.h>#include <sys/vm.h>#include <sys/cdefs.h>#include <sys/buf.h>#include <sys/lock.h>
#define NOLIST ((struct buf *)0x87654321)
/* * Attributes of an I/O to be used by lower layers */struct bufattr {#if CONFIG_PROTECT struct cprotect *ba_cpentry; /* address of cp_entry */ uint64_t ba_cp_file_off; /* rounded file offset. See buf_setcpoff() for more comments */#endif uint64_t ba_flags; /* flags. Some are only in-use on embedded devices */};
/* * The buffer header describes an I/O operation in the kernel. */struct buf { LIST_ENTRY(buf) b_hash; /* Hash chain. */ LIST_ENTRY(buf) b_vnbufs; /* Buffer's associated vnode. */ TAILQ_ENTRY(buf) b_freelist; /* Free list position if not active. */ int b_timestamp; /* timestamp for queuing operation */ int b_whichq; /* the free list the buffer belongs to */ volatile uint32_t b_flags; /* B_* flags. */ volatile uint32_t b_lflags; /* BL_BUSY | BL_WANTED flags... protected by buf_mtx */ int b_error; /* errno value. */ int b_bufsize; /* Allocated buffer size. */ int b_bcount; /* Valid bytes in buffer. */ int b_resid; /* Remaining I/O. */ dev_t b_dev; /* Device associated with buffer. */ uintptr_t b_datap; /* Memory, superblocks, indirect etc.*/ daddr64_t b_lblkno; /* Logical block number. */ daddr64_t b_blkno; /* Underlying physical block number. */ void (*b_iodone)(buf_t, void *); /* Function to call upon completion. */ vnode_t b_vp; /* File vnode for data, device vnode for metadata. */ kauth_cred_t b_rcred; /* Read credentials reference. */ kauth_cred_t b_wcred; /* Write credentials reference. */ void * b_upl; /* Pointer to UPL */ buf_t b_real_bp; /* used to track bp generated through cluster_bp */ TAILQ_ENTRY(buf) b_act; /* Device driver queue when active */ void * b_drvdata; /* Device driver private use */ void * b_fsprivate; /* filesystem private use */ void * b_transaction; /* journal private use */ int b_dirtyoff; /* Offset in buffer of dirty region. */ int b_dirtyend; /* Offset of end of dirty region. */ int b_validoff; /* Offset in buffer of valid region. */ int b_validend; /* Offset of end of valid region. */
/* store extra information related to redundancy of data, such as * which redundancy copy to use, etc */ uint32_t b_redundancy_flags;
proc_t b_proc; /* Associated proc; NULL if kernel. */#ifdef BUF_MAKE_PRIVATE buf_t b_data_store;#endif struct bufattr b_attr;#ifdef JOE_DEBUG void * b_owner; int b_tag; void * b_lastbrelse; void * b_stackbrelse[6]; void * b_stackgetblk[6];#endif};
/* cluster_io definitions for use with io bufs */#define b_uploffset b_bufsize#define b_orig b_freelist.tqe_prev#define b_shadow b_freelist.tqe_next#define b_shadow_ref b_validoff#ifdef BUF_MAKE_PRIVATE#define b_data_ref b_validend#endif#define b_trans_head b_freelist.tqe_prev#define b_trans_next b_freelist.tqe_next#define b_iostate b_rcred#define b_cliodone b_wcred
/* * These flags are kept in b_lflags... * buf_mtxp must be held before examining/updating */#define BL_BUSY 0x00000001 /* I/O in progress. */#define BL_WANTED 0x00000002 /* Process wants this buffer. */#define BL_IOBUF 0x00000004 /* buffer allocated via 'buf_alloc' */#define BL_WANTDEALLOC 0x00000010 /* buffer should be put on empty list when clean */#define BL_SHADOW 0x00000020#define BL_EXTERNAL 0x00000040#define BL_WAITSHADOW 0x00000080#define BL_IOBUF_ALLOC 0x00000100#define BL_WANTED_REF 0x00000200
/* * Parameters for buffer cache garbage collection */#define BUF_STALE_THRESHHOLD 30 /* Collect if untouched in the last 30 seconds */#define BUF_MAX_GC_BATCH_SIZE 64 /* Under a single grab of the lock */
/* * mask used by buf_flags... these are the readable external flags */#define BUF_X_RDFLAGS (B_PHYS | B_RAW | B_LOCKED | B_ASYNC | B_READ | B_WRITE | B_PAGEIO |\ B_META | B_CLUSTER | B_DELWRI | B_FUA | B_PASSIVE | B_IOSTREAMING | B_THROTTLED_IO |\ B_ENCRYPTED_IO | B_STATICCONTENT)/* * mask used by buf_clearflags/buf_setflags... these are the writable external flags */#define BUF_X_WRFLAGS (B_PHYS | B_RAW | B_LOCKED | B_ASYNC | B_READ | B_WRITE | B_PAGEIO |\ B_NOCACHE | B_FUA | B_PASSIVE | B_IOSTREAMING)
/* * These flags are kept in b_flags... access is lockless * External flags are defined in buf.h and cannot overlap * the internal flags * * these flags are internal... there definition may change */#define B_CACHE 0x00010000 /* getblk found us in the cache. */#define B_DONE 0x00020000 /* I/O completed. */#define B_INVAL 0x00040000 /* Does not contain valid info. */#define B_ERROR 0x00080000 /* I/O error occurred. */#define B_EINTR 0x00100000 /* I/O was interrupted */#define B_AGE 0x00200000 /* Move to age queue when I/O done. */#define B_FILTER 0x00400000 /* call b_iodone from biodone as an in-line filter */#define B_CALL 0x00800000 /* Call b_iodone from biodone, assumes b_iodone consumes bp */#define B_EOT 0x01000000 /* last buffer in a transaction list created by cluster_io */#define B_WASDIRTY 0x02000000 /* page was found dirty in the VM cache */#define B_HDRALLOC 0x04000000 /* zone allocated buffer header */#define B_ZALLOC 0x08000000 /* b_datap is zalloc()ed *//* * private flags used by the journal layer */#define B_NORELSE 0x10000000 /* don't brelse() in bwrite() *//* * private flags used by by the cluster layer */#define B_TWANTED 0x20000000 /* but_t that is part of a cluster level transaction is wanted */#define B_COMMIT_UPL 0x40000000 /* commit/abort the UPL on I/O success/failure */#define B_TDONE 0x80000000 /* buf_t that is part of a cluster level transaction has completed */
/* Flags to low-level allocation routines. */#define B_CLRBUF 0x01 /* Request allocated buffer be cleared. */#define B_SYNC 0x02 /* Do all allocations synchronously. */#define B_NOBUFF 0x04 /* Do not allocate struct buf */
/* * ba_flags (Buffer Attribute flags) * Some of these may be in-use only on embedded devices. */#define BA_RAW_ENCRYPTED_IO 0x00000001#define BA_THROTTLED_IO 0x00000002#define BA_DELAYIDLESLEEP 0x00000004 /* Process is marked to delay idle sleep on disk IO */#define BA_NOCACHE 0x00000008#define BA_META 0x00000010
extern int niobuf_headers; /* The number of IO buffer headers for cluster IO */extern int nbuf_headers; /* The number of buffer headers */extern int max_nbuf_headers; /* The max number of buffer headers */extern int nbuf_hashelements; /* The number of elements in bufhash */extern struct buf *buf_headers; /* The buffer headers. */
/* * Definitions for the buffer free lists. */#define BQUEUES 6 /* number of free buffer queues */
#define BQ_LOCKED 0 /* super-blocks &c */#define BQ_LRU 1 /* lru, useful buffers */#define BQ_AGE 2 /* rubbish */#define BQ_EMPTY 3 /* buffer headers with no memory */#define BQ_META 4 /* buffer containing metadata */#define BQ_LAUNDRY 5 /* buffers that need cleaning */
__BEGIN_DECLS
buf_t buf_create_shadow_priv(buf_t bp, boolean_t force_copy, uintptr_t external_storage, void (*iodone)(buf_t, void *), void *arg);
buf_t alloc_io_buf(vnode_t, int);void free_io_buf(buf_t);
int allocbuf(struct buf *, int);void bufinit(void) __attribute__((section("__TEXT, initcode")));
/* * Flags for buf_acquire */#define BAC_NOWAIT 0x01 /* Don't wait if buffer is busy */#define BAC_REMOVE 0x02 /* Remove from free list once buffer is acquired */#define BAC_SKIP_NONLOCKED 0x04 /* Don't return LOCKED buffers */#define BAC_SKIP_LOCKED 0x08 /* Only return LOCKED buffers */
void buf_list_lock(void);void buf_list_unlock(void);
void cluster_init(void) __attribute__((section("__TEXT, initcode")));void buf_drop(buf_t);errno_t buf_acquire(buf_t, int, int, int);
int count_busy_buffers(void);int count_lock_queue(void);
int buf_flushdirtyblks_skipinfo (vnode_t, int, int, const char *);void buf_wait_for_shadow_io (vnode_t, daddr64_t);
#ifdef BUF_MAKE_PRIVATEerrno_t buf_make_private(buf_t bp);#endif
#ifdef CONFIG_PROTECTvoid buf_setcpaddr(buf_t, struct cprotect *);void buf_setcpoff (buf_t, uint64_t);#endif
__END_DECLS
/* * Stats on usefulness of the buffer cache */struct bufstats { long bufs_incore; /* found incore */ long bufs_busyincore; /* found incore. was busy */ long bufs_vmhits; /* not incore. found in VM */ long bufs_miss; /* not incore. not in VM */ long bufs_sleeps; /* buffer starvation */ long bufs_eblk; /* Calls to geteblk */ long bufs_iobufmax; /* Max. number of IO buffers used */ long bufs_iobufinuse; /* number of IO buffers in use */ long bufs_iobufsleeps; /* IO buffer starvation */};
#endif /* KERNEL */#endif /* !_SYS_BUF_H_ */