+++ /dev/null
-/*
- * 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 8.7 (Berkeley) 1/21/94
- */
-
-#ifndef _SYS_BUF_H_
-#define _SYS_BUF_H_
-#include <sys/queue.h>
-
-#define NOLIST ((struct buf *)0x87654321)
-
-struct buf;
-
-struct iodone_chain {
- long ic_prev_flags;
- void (*ic_prev_iodone) __P((struct buf *));
- void *ic_prev_iodone_chain;
- struct {
- long ia_long;
- void *ia_ptr;
- } ic_args[5];
-};
-
-/*
- * 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. */
- struct buf *b_actf, **b_actb; /* Device driver queue when active. */
- struct proc *b_proc; /* Associated proc; NULL if kernel. */
- volatile long b_flags; /* B_* flags. */
- int b_qindex; /* buffer queue index */
- int b_error; /* Errno value. */
- long b_bufsize; /* Allocated buffer size. */
- long b_bcount; /* Valid bytes in buffer. */
- long b_resid; /* Remaining I/O. */
- dev_t b_dev; /* Device associated with buffer. */
- struct {
- caddr_t b_addr; /* Memory, superblocks, indirect etc. */
- } b_un;
- void *b_saveaddr; /* Original b_addr for physio. */
- daddr_t b_lblkno; /* Logical block number. */
- daddr_t b_blkno; /* Underlying physical block number. */
- /* Function to call upon completion. */
- void (*b_iodone) __P((struct buf *));
- /* For nested b_iodone's. */
- struct iodone_chain *b_iodone_chain;
- struct vnode *b_vp; /* Device vnode. */
- int b_pfcent; /* Center page when swapping cluster. */
- int b_dirtyoff; /* Offset in buffer of dirty region. */
- int b_dirtyend; /* Offset of end of dirty region. */
- struct ucred *b_rcred; /* Read credentials reference. */
- struct ucred *b_wcred; /* Write credentials reference. */
- int b_validoff; /* Offset in buffer of valid region. */
- int b_validend; /* Offset of end of valid region. */
- daddr_t b_pblkno; /* physical block number */
- caddr_t b_savekva; /* saved kva for transfer while bouncing */
- void *b_driver1; /* for private use by the driver */
- void *b_driver2; /* for private use by the driver */
- void *b_spc;
- struct vm_page *b_pages[(MAXPHYS + PAGE_SIZE - 1)/PAGE_SIZE];
- int b_npages;
-};
-
-/* Device driver compatibility definitions. */
-#define b_active b_bcount /* Driver queue head: drive active. */
-#define b_data b_un.b_addr /* b_un.b_addr is not changeable. */
-#define b_errcnt b_resid /* Retry count while I/O in progress. */
-#define iodone biodone /* Old name for biodone. */
-#define iowait biowait /* Old name for biowait. */
-
-/*
- * These flags are kept in b_flags.
- */
-#define B_AGE 0x00000001 /* Move to age queue when I/O done. */
-#define B_APPENDWRITE 0x00000002 /* Append-write in progress. */
-#define B_ASYNC 0x00000004 /* Start I/O, do not wait. */
-#define B_BAD 0x00000008 /* Bad block revectoring in progress. */
-#define B_BUSY 0x00000010 /* I/O in progress. */
-#define B_CACHE 0x00000020 /* Bread found us in the cache. */
-#define B_CALL 0x00000040 /* Call b_iodone from biodone. */
-#define B_DELWRI 0x00000080 /* Delay I/O until buffer reused. */
-#define B_DIRTY 0x00000100 /* Dirty page to be pushed out async. */
-#define B_DONE 0x00000200 /* I/O completed. */
-#define B_EINTR 0x00000400 /* I/O was interrupted */
-#define B_ERROR 0x00000800 /* I/O error occurred. */
-#define B_GATHERED 0x00001000 /* LFS: already in a segment. */
-#define B_INVAL 0x00002000 /* Does not contain valid info. */
-#define B_LOCKED 0x00004000 /* Locked in core (not reusable). */
-#define B_NOCACHE 0x00008000 /* Do not cache block after use. */
-#define B_MALLOC 0x00010000 /* malloced b_data */
-#define B_CLUSTEROK 0x00020000 /* Pagein op, so swap() can count it. */
-#define B_PHYS 0x00040000 /* I/O to user memory. */
-#define B_RAW 0x00080000 /* Set by physio for raw transfers. */
-#define B_READ 0x00100000 /* Read buffer. */
-#define B_TAPE 0x00200000 /* Magnetic tape I/O. */
-#define B_RELBUF 0x00400000 /* Release VMIO buffer. */
-#define B_WANTED 0x00800000 /* Process wants this buffer. */
-#define B_WRITE 0x00000000 /* Write buffer (pseudo flag). */
-#define B_WRITEINPROG 0x01000000 /* Write in progress. */
-#define B_XXX 0x02000000 /* Debugging flag. */
-#define B_PAGING 0x04000000 /* volatile paging I/O -- bypass VMIO */
-#define B_VMIO 0x20000000 /* VMIO flag */
-#define B_CLUSTER 0x40000000 /* pagein op, so swap() can count it */
-#define B_BOUNCE 0x80000000 /* bounce buffer flag */
-
-/*
- * This structure describes a clustered I/O. It is stored in the b_saveaddr
- * field of the buffer on which I/O is done. At I/O completion, cluster
- * callback uses the structure to parcel I/O's to individual buffers, and
- * then free's this structure.
- */
-struct cluster_save {
- long bs_bcount; /* Saved b_bcount. */
- long bs_bufsize; /* Saved b_bufsize. */
- void *bs_saveaddr; /* Saved b_addr. */
- int bs_nchildren; /* Number of associated buffers. */
- struct buf **bs_children; /* List of associated buffers. */
-};
-
-/*
- * number of buffer hash entries
- */
-#define BUFHSZ 512
-
-/*
- * buffer hash table calculation, originally by David Greenman
- */
-#define BUFHASH(vnp, bn) \
- (&bufhashtbl[(((unsigned long)(vnp) >> 7)+(int)(bn)) % BUFHSZ])
-
-/*
- * Definitions for the buffer free lists.
- */
-#define BUFFER_QUEUES 6 /* number of free buffer queues */
-
-LIST_HEAD(bufhashhdr, buf) bufhashtbl[BUFHSZ], invalhash;
-TAILQ_HEAD(bqueues, buf) bufqueues[BUFFER_QUEUES];
-
-#define QUEUE_NONE 0 /* on no queue */
-#define QUEUE_LOCKED 1 /* locked buffers */
-#define QUEUE_LRU 2 /* useful buffers */
-#define QUEUE_VMIO 3 /* VMIO buffers */
-#define QUEUE_AGE 4 /* not-useful buffers */
-#define QUEUE_EMPTY 5 /* empty buffer headers*/
-
-/*
- * Zero out the buffer's data area.
- */
-#define clrbuf(bp) { \
- blkclr((bp)->b_data, (u_int)(bp)->b_bcount); \
- (bp)->b_resid = 0; \
-}
-
-/* Flags to low-level allocation routines. */
-#define B_CLRBUF 0x01 /* Request allocated buffer be cleared. */
-#define B_SYNC 0x02 /* Do all allocations synchronously. */
-
-#ifdef KERNEL
-extern int nbuf; /* The number of buffer headers */
-extern struct buf *buf; /* The buffer headers. */
-extern char *buffers; /* The buffer contents. */
-extern int bufpages; /* Number of memory pages in the buffer pool. */
-extern struct buf *swbuf; /* Swap I/O buffer headers. */
-extern int nswbuf; /* Number of swap I/O buffer headers. */
-extern TAILQ_HEAD(swqueue, buf) bswlist;
-
-__BEGIN_DECLS
-void bufinit __P((void));
-void bremfree __P((struct buf *));
-int bread __P((struct vnode *, daddr_t, int,
- struct ucred *, struct buf **));
-int breadn __P((struct vnode *, daddr_t, int, daddr_t *, int *, int,
- struct ucred *, struct buf **));
-int bwrite __P((struct buf *));
-void bdwrite __P((struct buf *));
-void bawrite __P((struct buf *));
-void brelse __P((struct buf *));
-void vfs_bio_awrite __P((struct buf *));
-struct buf * getpbuf __P((void));
-struct buf *incore __P((struct vnode *, daddr_t));
-int inmem __P((struct vnode *, daddr_t));
-struct buf *getblk __P((struct vnode *, daddr_t, int, int, int));
-struct buf *geteblk __P((int));
-int allocbuf __P((struct buf *, int));
-int biowait __P((struct buf *));
-void biodone __P((struct buf *));
-
-void cluster_callback __P((struct buf *));
-int cluster_read __P((struct vnode *, u_quad_t, daddr_t, long,
- struct ucred *, struct buf **));
-void cluster_wbuild __P((struct vnode *, struct buf *, long, daddr_t, int,
- daddr_t));
-void cluster_write __P((struct buf *, u_quad_t));
-int physio __P((void (*)(), struct buf *, dev_t, int, u_int (*)(),
- struct uio *));
-u_int minphys __P((struct buf *));
-void vfs_bio_clrbuf __P((struct buf *));
-void vfs_busy_pages __P((struct buf *, int clear_modify));
-void vfs_unbusy_pages(struct buf *);
-void vwakeup __P((struct buf *));
-void vmapbuf __P((struct buf *));
-void vunmapbuf __P((struct buf *));
-void relpbuf __P((struct buf *));
-void brelvp __P((struct buf *));
-void bgetvp __P((struct vnode *, struct buf *));
-void pbgetvp __P((struct vnode *, struct buf *));
-void pbrelvp __P((struct buf *));
-void reassignbuf __P((struct buf *, struct vnode *));
-struct buf *trypbuf __P((void));
-void vm_bounce_alloc __P((struct buf *));
-void vm_bounce_free __P((struct buf *));
-vm_offset_t vm_bounce_kva_alloc __P((int));
-void vm_bounce_kva_alloc_free __P((vm_offset_t, int));
-__END_DECLS
-#endif
-#endif /* !_SYS_BUF_H_ */
projects / reactos.git / blobdiff