a2aeaf4564
The last consumer of this code (the old SCSI system) has left us and the CAM code does it's own bouncing. The isa dma system has been doing it's own bouncing for a while too. Reviewed by: core
332 lines
12 KiB
C
332 lines
12 KiB
C
/*
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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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* $Id: buf.h,v 1.57 1998/09/24 15:02:46 luoqi Exp $
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*/
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#ifndef _SYS_BUF_H_
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#define _SYS_BUF_H_
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#include <sys/queue.h>
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#define NOLIST ((struct buf *)0x87654321)
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struct buf;
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struct mount;
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struct vnode;
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/*
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* To avoid including <ufs/ffs/softdep.h>
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*/
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LIST_HEAD(workhead, worklist);
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/*
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* These are currently used only by the soft dependency code, hence
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* are stored once in a global variable. If other subsystems wanted
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* to use these hooks, a pointer to a set of bio_ops could be added
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* to each buffer.
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*/
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extern struct bio_ops {
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void (*io_start) __P((struct buf *));
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void (*io_complete) __P((struct buf *));
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void (*io_deallocate) __P((struct buf *));
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int (*io_fsync) __P((struct vnode *));
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int (*io_sync) __P((struct mount *));
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} bioops;
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struct iodone_chain {
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long ic_prev_flags;
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void (*ic_prev_iodone) __P((struct buf *));
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void *ic_prev_iodone_chain;
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struct {
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long ia_long;
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void *ia_ptr;
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} ic_args[5];
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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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TAILQ_ENTRY(buf) b_act; /* Device driver queue when active. *new* */
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struct proc *b_proc; /* Associated proc; NULL if kernel. */
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long b_flags; /* B_* flags. */
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unsigned short b_qindex; /* buffer queue index */
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unsigned char b_usecount; /* buffer use count */
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int b_error; /* Errno value. */
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long b_bufsize; /* Allocated buffer size. */
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long b_bcount; /* Valid bytes in buffer. */
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long b_resid; /* Remaining I/O. */
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dev_t b_dev; /* Device associated with buffer. */
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caddr_t b_data; /* Memory, superblocks, indirect etc. */
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caddr_t b_kvabase; /* base kva for buffer */
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int b_kvasize; /* size of kva for buffer */
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daddr_t b_lblkno; /* Logical block number. */
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daddr_t b_blkno; /* Underlying physical block number. */
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off_t b_offset; /* Offset into file */
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/* Function to call upon completion. */
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void (*b_iodone) __P((struct buf *));
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/* For nested b_iodone's. */
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struct iodone_chain *b_iodone_chain;
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struct vnode *b_vp; /* Device vnode. */
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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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struct ucred *b_rcred; /* Read credentials reference. */
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struct ucred *b_wcred; /* Write credentials reference. */
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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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daddr_t b_pblkno; /* physical block number */
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void *b_saveaddr; /* Original b_addr for physio. */
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caddr_t b_savekva; /* saved kva for transfer while bouncing */
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void *b_driver1; /* for private use by the driver */
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void *b_driver2; /* for private use by the driver */
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void *b_spc;
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union cluster_info {
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TAILQ_HEAD(cluster_list_head, buf) cluster_head;
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TAILQ_ENTRY(buf) cluster_entry;
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} b_cluster;
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struct vm_page *b_pages[btoc(MAXPHYS)];
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int b_npages;
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struct workhead b_dep; /* List of filesystem dependencies. */
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};
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/*
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* These flags are kept in b_flags.
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*/
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#define B_AGE 0x00000001 /* Move to age queue when I/O done. */
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#define B_NEEDCOMMIT 0x00000002 /* Append-write in progress. */
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#define B_ASYNC 0x00000004 /* Start I/O, do not wait. */
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#define B_BAD 0x00000008 /* Bad block revectoring in progress. */
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#define B_BUSY 0x00000010 /* I/O in progress. */
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#define B_CACHE 0x00000020 /* Bread found us in the cache. */
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#define B_CALL 0x00000040 /* Call b_iodone from biodone. */
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#define B_DELWRI 0x00000080 /* Delay I/O until buffer reused. */
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#define B_FREEBUF 0x00000100 /* Instruct driver: free blocks */
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#define B_DONE 0x00000200 /* I/O completed. */
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#define B_EINTR 0x00000400 /* I/O was interrupted */
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#define B_ERROR 0x00000800 /* I/O error occurred. */
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#define B_AVAIL2 0x00001000 /* Available flag */
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#define B_INVAL 0x00002000 /* Does not contain valid info. */
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#define B_LOCKED 0x00004000 /* Locked in core (not reusable). */
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#define B_NOCACHE 0x00008000 /* Do not cache block after use. */
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#define B_MALLOC 0x00010000 /* malloced b_data */
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#define B_CLUSTEROK 0x00020000 /* Pagein op, so swap() can count it. */
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#define B_PHYS 0x00040000 /* I/O to user memory. */
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#define B_RAW 0x00080000 /* Set by physio for raw transfers. */
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#define B_READ 0x00100000 /* Read buffer. */
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#define B_AVAIL3 0x00200000 /* Available flag */
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#define B_RELBUF 0x00400000 /* Release VMIO buffer. */
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#define B_WANTED 0x00800000 /* Process wants this buffer. */
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#define B_WRITE 0x00000000 /* Write buffer (pseudo flag). */
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#define B_WRITEINPROG 0x01000000 /* Write in progress. */
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#define B_XXX 0x02000000 /* Debugging flag. */
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#define B_PAGING 0x04000000 /* volatile paging I/O -- bypass VMIO */
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#define B_ORDERED 0x08000000 /* Must guarantee I/O ordering */
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#define B_RAM 0x10000000 /* Read ahead mark (flag) */
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#define B_VMIO 0x20000000 /* VMIO flag */
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#define B_CLUSTER 0x40000000 /* pagein op, so swap() can count it */
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#define B_AVAIL1 0x80000000 /* Available flag */
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#define PRINT_BUF_FLAGS "\20\40avail1\37cluster\36vmio\35ram\34ordered" \
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"\33paging\32xxx\31writeinprog\30wanted\27relbuf\26avail3" \
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"\25read\24raw\23phys\22clusterok\21malloc\20nocache" \
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"\17locked\16inval\15avail2\14error\13eintr\12done\11freebuf" \
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"\10delwri\7call\6cache\5busy\4bad\3async\2needcommit\1age"
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#define NOOFFSET (-1LL) /* No buffer offset calculated yet */
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struct buf_queue_head {
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TAILQ_HEAD(buf_queue, buf) queue;
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daddr_t last_pblkno;
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struct buf *insert_point;
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struct buf *switch_point;
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};
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static __inline void bufq_init __P((struct buf_queue_head *head));
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static __inline void bufq_insert_tail __P((struct buf_queue_head *head,
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struct buf *bp));
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static __inline void bufq_remove __P((struct buf_queue_head *head,
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struct buf *bp));
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static __inline struct buf *bufq_first __P((struct buf_queue_head *head));
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static __inline void
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bufq_init(struct buf_queue_head *head)
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{
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TAILQ_INIT(&head->queue);
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head->last_pblkno = 0;
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head->insert_point = NULL;
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head->switch_point = NULL;
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}
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static __inline void
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bufq_insert_tail(struct buf_queue_head *head, struct buf *bp)
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{
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if ((bp->b_flags & B_ORDERED) != 0) {
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head->insert_point = bp;
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head->switch_point = NULL;
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}
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TAILQ_INSERT_TAIL(&head->queue, bp, b_act);
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}
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static __inline void
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bufq_remove(struct buf_queue_head *head, struct buf *bp)
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{
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if (bp == head->switch_point)
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head->switch_point = TAILQ_NEXT(bp, b_act);
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if (bp == head->insert_point) {
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head->insert_point = TAILQ_PREV(bp, buf_queue, b_act);
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if (head->insert_point == NULL)
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head->last_pblkno = 0;
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} else if (bp == TAILQ_FIRST(&head->queue)) {
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head->last_pblkno = bp->b_pblkno;
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}
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TAILQ_REMOVE(&head->queue, bp, b_act);
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if (TAILQ_FIRST(&head->queue) == head->switch_point)
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head->switch_point = NULL;
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}
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static __inline struct buf *
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bufq_first(struct buf_queue_head *head)
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{
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return (TAILQ_FIRST(&head->queue));
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}
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/*
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* number of buffer hash entries
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*/
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#define BUFHSZ 512
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/*
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* buffer hash table calculation, originally by David Greenman
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*/
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#define BUFHASH(vnp, bn) \
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(&bufhashtbl[(((uintptr_t)(vnp) >> 7)+(int)(bn)) % BUFHSZ])
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/*
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* Definitions for the buffer free lists.
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*/
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#define BUFFER_QUEUES 6 /* number of free buffer queues */
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#define QUEUE_NONE 0 /* on no queue */
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#define QUEUE_LOCKED 1 /* locked buffers */
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#define QUEUE_LRU 2 /* useful buffers */
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#define QUEUE_VMIO 3 /* VMIO buffers */
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#define QUEUE_AGE 4 /* not-useful buffers */
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#define QUEUE_EMPTY 5 /* empty buffer headers*/
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/*
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* Zero out the buffer's data area.
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*/
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#define clrbuf(bp) { \
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bzero((bp)->b_data, (u_int)(bp)->b_bcount); \
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(bp)->b_resid = 0; \
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}
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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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#ifdef KERNEL
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extern int nbuf; /* The number of buffer headers */
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extern struct buf *buf; /* The buffer headers. */
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extern char *buffers; /* The buffer contents. */
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extern int bufpages; /* Number of memory pages in the buffer pool. */
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extern struct buf *swbuf; /* Swap I/O buffer headers. */
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extern int nswbuf; /* Number of swap I/O buffer headers. */
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extern int needsbuffer, numdirtybuffers;
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extern TAILQ_HEAD(swqueue, buf) bswlist;
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extern TAILQ_HEAD(bqueues, buf) bufqueues[BUFFER_QUEUES];
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struct uio;
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void bufinit __P((void));
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void bremfree __P((struct buf *));
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int bread __P((struct vnode *, daddr_t, int,
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struct ucred *, struct buf **));
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int breadn __P((struct vnode *, daddr_t, int, daddr_t *, int *, int,
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struct ucred *, struct buf **));
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int bwrite __P((struct buf *));
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void bdwrite __P((struct buf *));
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void bawrite __P((struct buf *));
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void bdirty __P((struct buf *));
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int bowrite __P((struct buf *));
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void brelse __P((struct buf *));
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void bqrelse __P((struct buf *));
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int vfs_bio_awrite __P((struct buf *));
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struct buf * getpbuf __P((void));
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struct buf *incore __P((struct vnode *, daddr_t));
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struct buf *gbincore __P((struct vnode *, daddr_t));
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int inmem __P((struct vnode *, daddr_t));
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struct buf *getblk __P((struct vnode *, daddr_t, int, int, int));
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struct buf *geteblk __P((int));
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int allocbuf __P((struct buf *, int));
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int biowait __P((struct buf *));
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void biodone __P((struct buf *));
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void cluster_callback __P((struct buf *));
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int cluster_read __P((struct vnode *, u_quad_t, daddr_t, long,
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struct ucred *, long, int, struct buf **));
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int cluster_wbuild __P((struct vnode *, long, daddr_t, int));
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void cluster_write __P((struct buf *, u_quad_t));
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int physio __P((void (*)(struct buf *), struct buf *, dev_t,
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int, u_int (*)(struct buf *), struct uio *));
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u_int minphys __P((struct buf *));
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void vfs_bio_clrbuf __P((struct buf *));
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void vfs_busy_pages __P((struct buf *, int clear_modify));
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void vfs_unbusy_pages __P((struct buf *));
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void vwakeup __P((struct buf *));
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void vmapbuf __P((struct buf *));
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void vunmapbuf __P((struct buf *));
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void relpbuf __P((struct buf *));
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void brelvp __P((struct buf *));
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void bgetvp __P((struct vnode *, struct buf *));
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void pbgetvp __P((struct vnode *, struct buf *));
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void pbrelvp __P((struct buf *));
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void reassignbuf __P((struct buf *, struct vnode *));
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struct buf *trypbuf __P((void));
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void vfs_bio_need_satisfy __P((void));
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#endif /* KERNEL */
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#endif /* !_SYS_BUF_H_ */
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