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Diffstat (limited to 'c/src/libnetworking/sys/buf.h')
| -rw-r--r-- | c/src/libnetworking/sys/buf.h | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/c/src/libnetworking/sys/buf.h b/c/src/libnetworking/sys/buf.h new file mode 100644 index 0000000000..6cca571141 --- /dev/null +++ b/c/src/libnetworking/sys/buf.h @@ -0,0 +1,248 @@ +/* + * 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 + * $Id$ + */ + +#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]; +}; + +typedef TAILQ_HEAD(buf_queue_head, buf) buf_queue_head, *buf_queue_head_t; + +/* + * 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. */ + TAILQ_ENTRY(buf) b_act; /* Device driver queue when active. *new* */ + struct proc *b_proc; /* Associated proc; NULL if kernel. */ + long b_flags; /* B_* flags. */ + unsigned short b_qindex; /* buffer queue index */ + unsigned char b_usecount; /* buffer use count */ + 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; + caddr_t b_kvabase; /* base kva for buffer */ + int b_kvasize; /* size of kva for buffer */ + 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_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; + union cluster_info { + TAILQ_HEAD(cluster_list_head, buf) cluster_head; + TAILQ_ENTRY(buf) cluster_entry; + } b_cluster; + struct vm_page *b_pages[btoc(MAXPHYS)]; + int b_npages; +}; + +/* Device driver compatibility definitions. */ +#define b_data b_un.b_addr /* b_un.b_addr is not changeable. */ + +/* + * These flags are kept in b_flags. + */ +#define B_AGE 0x00000001 /* Move to age queue when I/O done. */ +#define B_NEEDCOMMIT 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_ORDERED 0x08000000 /* Must guarantee I/O ordering */ +#define B_VMIO 0x20000000 /* VMIO flag */ +#define B_CLUSTER 0x40000000 /* pagein op, so swap() can count it */ +#define B_BOUNCE 0x80000000 /* bounce buffer flag */ + +/* + * 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 */ + +extern LIST_HEAD(bufhashhdr, buf) bufhashtbl[BUFHSZ], invalhash; +extern 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) { \ + bzero((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; + +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 *)); +int bowrite __P((struct buf *)); +void brelse __P((struct buf *)); +void bqrelse __P((struct buf *)); +int vfs_bio_awrite __P((struct buf *)); +struct buf * getpbuf __P((void)); +struct buf *incore __P((struct vnode *, daddr_t)); +struct buf *gbincore __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 **)); +int cluster_wbuild __P((struct vnode *, long, daddr_t, int)); +void cluster_write __P((struct buf *, u_quad_t)); +int physio __P((void (*)(struct buf *), struct buf *, dev_t, + int, u_int (*)(struct buf *), 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)); +#endif /* KERNEL */ + +#endif /* !_SYS_BUF_H_ */ |