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355 lines
15 KiB
C
355 lines
15 KiB
C
/*
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* Copyright (c) 2000-2014 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_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. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this 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_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* @(#)buf.h 8.9 (Berkeley) 3/30/95
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*/
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#ifndef _SYS_BUF_INTERNAL_H_
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#define _SYS_BUF_INTERNAL_H_
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#include <sys/appleapiopts.h>
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#ifdef KERNEL
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#include <sys/queue.h>
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#include <sys/errno.h>
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#include <sys/vm.h>
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#include <sys/cdefs.h>
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#include <sys/buf.h>
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#include <sys/lock.h>
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#if CONFIG_PROTECT
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#include <sys/cprotect.h>
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#endif
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#define NOLIST ((struct buf *)0x87654321)
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/*
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* Attributes of an I/O to be used by lower layers
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*/
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struct bufattr {
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#if CONFIG_PROTECT
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struct cpx *ba_cpx;
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uint64_t ba_cp_file_off;
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#endif
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uint64_t ba_flags; /* flags. Some are only in-use on embedded devices */
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};
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/*
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* The buffer header describes an I/O operation in the kernel.
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*/
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struct buf {
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LIST_ENTRY(buf) b_hash; /* Hash chain. */
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LIST_ENTRY(buf) b_vnbufs; /* Buffer's associated vnode. */
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TAILQ_ENTRY(buf) b_freelist; /* Free list position if not active. */
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int b_timestamp; /* timestamp for queuing operation */
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struct timeval b_timestamp_tv; /* microuptime for disk conditioner */
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int b_whichq; /* the free list the buffer belongs to */
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volatile uint32_t b_flags; /* B_* flags. */
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volatile uint32_t b_lflags; /* BL_BUSY | BL_WANTED flags... protected by buf_mtx */
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int b_error; /* errno value. */
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int b_bufsize; /* Allocated buffer size. */
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int b_bcount; /* Valid bytes in buffer. */
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int b_resid; /* Remaining I/O. */
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dev_t b_dev; /* Device associated with buffer. */
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uintptr_t b_datap; /* Memory, superblocks, indirect etc.*/
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daddr64_t b_lblkno; /* Logical block number. */
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daddr64_t b_blkno; /* Underlying physical block number. */
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void (*b_iodone)(buf_t, void *); /* Function to call upon completion. */
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vnode_t b_vp; /* File vnode for data, device vnode for metadata. */
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kauth_cred_t b_rcred; /* Read credentials reference. */
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kauth_cred_t b_wcred; /* Write credentials reference. */
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void * b_upl; /* Pointer to UPL */
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buf_t b_real_bp; /* used to track bp generated through cluster_bp */
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TAILQ_ENTRY(buf) b_act; /* Device driver queue when active */
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void * b_drvdata; /* Device driver private use */
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void * b_fsprivate; /* filesystem private use */
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void * b_transaction; /* journal private use */
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int b_dirtyoff; /* Offset in buffer of dirty region. */
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int b_dirtyend; /* Offset of end of dirty region. */
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int b_validoff; /* Offset in buffer of valid region. */
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int b_validend; /* Offset of end of valid region. */
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/* store extra information related to redundancy of data, such as
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* which redundancy copy to use, etc
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*/
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uint32_t b_redundancy_flags;
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proc_t b_proc; /* Associated proc; NULL if kernel. */
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#ifdef BUF_MAKE_PRIVATE
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buf_t b_data_store;
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#endif
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struct bufattr b_attr;
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#ifdef JOE_DEBUG
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void * b_owner;
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int b_tag;
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void * b_lastbrelse;
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void * b_stackbrelse[6];
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void * b_stackgetblk[6];
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#endif
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};
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extern vm_offset_t buf_kernel_addrperm;
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/* cluster_io definitions for use with io bufs */
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#define b_uploffset b_bufsize
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#define b_orig b_freelist.tqe_prev
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#define b_shadow b_freelist.tqe_next
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#define b_shadow_ref b_validoff
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#ifdef BUF_MAKE_PRIVATE
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#define b_data_ref b_validend
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#endif
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#define b_trans_head b_freelist.tqe_prev
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#define b_trans_next b_freelist.tqe_next
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#define b_iostate b_rcred
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#define b_cliodone b_wcred
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/*
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* These flags are kept in b_lflags...
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* buf_mtx must be held before examining/updating
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*/
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#define BL_BUSY 0x00000001 /* I/O in progress. */
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#define BL_WANTED 0x00000002 /* Process wants this buffer. */
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#define BL_IOBUF 0x00000004 /* buffer allocated via 'buf_alloc' */
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#define BL_WANTDEALLOC 0x00000010 /* buffer should be put on empty list when clean */
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#define BL_SHADOW 0x00000020
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#define BL_EXTERNAL 0x00000040
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#define BL_WAITSHADOW 0x00000080
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#define BL_IOBUF_ALLOC 0x00000100
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#define BL_WANTED_REF 0x00000200
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#define BL_IOBUF_VDEV 0x00000400 /* iobuf was for a diskimage */
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/*
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* Parameters for buffer cache garbage collection
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*/
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#define BUF_STALE_THRESHHOLD 30 /* Collect if untouched in the last 30 seconds */
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#define BUF_MAX_GC_BATCH_SIZE 64 /* Under a single grab of the lock */
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/*
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* mask used by buf_flags... these are the readable external flags
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*/
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#define BUF_X_RDFLAGS (B_PHYS | B_RAW | B_LOCKED | B_ASYNC | B_READ | B_WRITE | B_PAGEIO |\
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B_META | B_CLUSTER | B_DELWRI | B_FUA | B_PASSIVE | B_IOSTREAMING |\
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B_ENCRYPTED_IO | B_STATICCONTENT)
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/*
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* mask used by buf_clearflags/buf_setflags... these are the writable external flags
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*/
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#define BUF_X_WRFLAGS (B_PHYS | B_RAW | B_LOCKED | B_ASYNC | B_READ | B_WRITE | B_PAGEIO |\
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B_NOCACHE | B_FUA | B_PASSIVE | B_IOSTREAMING)
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#if 0
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/* b_flags defined in buf.h */
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#define B_WRITE 0x00000000 /* Write buffer (pseudo flag). */
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#define B_READ 0x00000001 /* Read buffer. */
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#define B_ASYNC 0x00000002 /* Start I/O, do not wait. */
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#define B_NOCACHE 0x00000004 /* Do not cache block after use. */
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#define B_DELWRI 0x00000008 /* Delay I/O until buffer reused. */
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#define B_LOCKED 0x00000010 /* Locked in core (not reusable). */
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#define B_PHYS 0x00000020 /* I/O to user memory. */
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#define B_CLUSTER 0x00000040 /* UPL based I/O generated by cluster layer */
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#define B_PAGEIO 0x00000080 /* Page in/out */
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#define B_META 0x00000100 /* buffer contains meta-data. */
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#define B_RAW 0x00000200 /* Set by physio for raw transfers. */
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#define B_FUA 0x00000400 /* Write-through disk cache(if supported) */
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#define B_PASSIVE 0x00000800 /* PASSIVE I/Os are ignored by THROTTLE I/O */
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#define B_IOSTREAMING 0x00001000 /* sequential access pattern detected */
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#define B_ENCRYPTED_IO 0x00004000 /* Encrypted I/O */
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#define B_STATICCONTENT 0x00008000 /* Buffer is likely to remain unaltered */
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#endif
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/*
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* These flags are kept in b_flags... access is lockless
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* External flags are defined in buf.h and cannot overlap
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* the internal flags
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*
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* these flags are internal... there definition may change
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*/
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#define B_CACHE 0x00010000 /* getblk found us in the cache. */
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#define B_DONE 0x00020000 /* I/O completed. */
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#define B_INVAL 0x00040000 /* Does not contain valid info. */
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#define B_ERROR 0x00080000 /* I/O error occurred. */
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#define B_EINTR 0x00100000 /* I/O was interrupted */
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#define B_AGE 0x00200000 /* Move to age queue when I/O done. */
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#define B_FILTER 0x00400000 /* call b_iodone from biodone as an in-line filter */
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#define B_CALL 0x00800000 /* Call b_iodone from biodone, assumes b_iodone consumes bp */
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#define B_EOT 0x01000000 /* last buffer in a transaction list created by cluster_io */
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#define B_WASDIRTY 0x02000000 /* page was found dirty in the VM cache */
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#define B_HDRALLOC 0x04000000 /* zone allocated buffer header */
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#define B_ZALLOC 0x08000000 /* b_datap is zalloc()ed */
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/*
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* private flags used by by the cluster layer
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*/
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#define B_COMMIT_UPL 0x40000000 /* commit/abort the UPL on I/O success/failure */
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#define B_TDONE 0x80000000 /* buf_t that is part of a cluster level transaction has completed */
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/* Flags to low-level allocation routines. */
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#define B_CLRBUF 0x01 /* Request allocated buffer be cleared. */
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#define B_SYNC 0x02 /* Do all allocations synchronously. */
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#define B_NOBUFF 0x04 /* Do not allocate struct buf */
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/*
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* ba_flags (Buffer Attribute flags)
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* Some of these may be in-use only on embedded devices.
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*/
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#define BA_RAW_ENCRYPTED_IO 0x00000001
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#define BA_THROTTLED_IO 0x00000002
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#define BA_DELAYIDLESLEEP 0x00000004 /* Process is marked to delay idle sleep on disk IO */
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#define BA_NOCACHE 0x00000008
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#define BA_META 0x00000010
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#define BA_GREEDY_MODE 0x00000020 /* High speed writes that consume more storage */
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#define BA_QUICK_COMPLETE 0x00000040 /* Request quick completion at expense of storage efficiency */
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#define BA_PASSIVE 0x00000080
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/*
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* Note: IO_TIERs consume 0x0100, 0x0200, 0x0400, 0x0800
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* These are now in-use by the I/O tiering system.
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*/
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#define BA_IO_TIER_MASK 0x00000f00
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#define BA_IO_TIER_SHIFT 8
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#define BA_ISOCHRONOUS 0x00001000 /* device specific isochronous throughput to media */
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#define BA_STRATEGY_TRACKED_IO 0x00002000 /* tracked by spec_strategy */
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#define BA_IO_TIER_UPGRADE 0x00004000 /* effective I/O tier is higher than BA_IO_TIER */
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#define BA_IO_SCHEDULED 0x00008000 /* buf is associated with a mount point that is io scheduled */
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#define BA_EXPEDITED_META_IO 0x00010000 /* metadata I/O which needs a high I/O tier */
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#define GET_BUFATTR_IO_TIER(bap) ((bap->ba_flags & BA_IO_TIER_MASK) >> BA_IO_TIER_SHIFT)
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#define SET_BUFATTR_IO_TIER(bap, tier) \
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do { \
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(bap)->ba_flags &= (~BA_IO_TIER_MASK); \
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(bap)->ba_flags |= (((tier) << BA_IO_TIER_SHIFT) & BA_IO_TIER_MASK); \
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} while(0)
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extern int niobuf_headers; /* The number of IO buffer headers for cluster IO */
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extern int nbuf_headers; /* The number of buffer headers */
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extern int max_nbuf_headers; /* The max number of buffer headers */
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extern int nbuf_hashelements; /* The number of elements in bufhash */
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extern struct buf *buf_headers; /* The buffer headers. */
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/*
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* Definitions for the buffer free lists.
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*/
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enum bq_opts {
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BQ_LOCKED = 0, /* super-blocks &c */
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BQ_LRU = 1, /* lru, useful buffers */
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BQ_AGE = 2, /* rubbish */
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BQ_EMPTY = 3, /* buffer headers with no memory */
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BQ_META = 4, /* buffer containing metadata */
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BQ_LAUNDRY = 5, /* buffers that need cleaning */
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BQUEUES = 6 /* number of free buffer queues */
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};
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__BEGIN_DECLS
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buf_t alloc_io_buf(vnode_t, int);
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void free_io_buf(buf_t);
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int allocbuf(struct buf *, int);
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void bufinit(void);
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void buf_list_lock(void);
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void buf_list_unlock(void);
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void cluster_init(void);
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uint32_t count_busy_buffers(void);
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int buf_flushdirtyblks_skipinfo(vnode_t, int, int, const char *);
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void buf_wait_for_shadow_io(vnode_t, daddr64_t);
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#ifdef BUF_MAKE_PRIVATE
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errno_t buf_make_private(buf_t bp);
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#endif
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#ifdef CONFIG_PROTECT
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void buf_setcpoff(buf_t, uint64_t);
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#endif
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__END_DECLS
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/*
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* Stats on usefulness of the buffer cache
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*/
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struct bufstats {
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long bufs_incore; /* found incore */
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long bufs_busyincore; /* found incore. was busy */
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long bufs_vmhits; /* not incore. found in VM */
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long bufs_miss; /* not incore. not in VM */
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long bufs_sleeps; /* buffer starvation */
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long bufs_eblk; /* Calls to geteblk */
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uint32_t bufs_iobufmax; /* Max. number of IO buffers used */
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uint32_t bufs_iobufinuse; /* number of IO buffers in use */
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long bufs_iobufsleeps; /* IO buffer starvation */
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long bufs_iobufinuse_vdev; /* number of IO buffers in use by
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* diskimages */
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};
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#endif /* KERNEL */
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#endif /* !_SYS_BUF_H_ */
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