Switch to a version of select that is closer to bsd's version.

1 files changed, 526 insertions, 0 deletions

diff --git a/freebsd/sys/buf.h b/freebsd/sys/buf.h
new file mode 100644
index 00000000..88e55d95
--- /dev/null
+++ b/freebsd/sys/buf.h
@@ -0,0 +1,526 @@
+/*-
+ * 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.
+ * 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
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_BUF_HH_
+#define	_SYS_BUF_HH_
+
+#include <freebsd/sys/bufobj.h>
+#include <freebsd/sys/queue.h>
+#include <freebsd/sys/lock.h>
+#include <freebsd/sys/lockmgr.h>
+
+struct bio;
+struct buf;
+struct bufobj;
+struct mount;
+struct vnode;
+struct uio;
+
+/*
+ * To avoid including <ufs/ffs/softdep.h> 
+ */   
+LIST_HEAD(workhead, worklist);
+/*
+ * These are currently used only by the soft dependency code, hence
+ * are stored once in a global variable. If other subsystems wanted
+ * to use these hooks, a pointer to a set of bio_ops could be added
+ * to each buffer.
+ */
+extern struct bio_ops {
+	void	(*io_start)(struct buf *);
+	void	(*io_complete)(struct buf *);
+	void	(*io_deallocate)(struct buf *);
+	int	(*io_countdeps)(struct buf *, int);
+} bioops;
+
+struct vm_object;
+
+typedef unsigned char b_xflags_t;
+
+/*
+ * The buffer header describes an I/O operation in the kernel.
+ *
+ * NOTES:
+ *	b_bufsize, b_bcount.  b_bufsize is the allocation size of the
+ *	buffer, either DEV_BSIZE or PAGE_SIZE aligned.  b_bcount is the
+ *	originally requested buffer size and can serve as a bounds check
+ *	against EOF.  For most, but not all uses, b_bcount == b_bufsize.
+ *
+ *	b_dirtyoff, b_dirtyend.  Buffers support piecemeal, unaligned
+ *	ranges of dirty data that need to be written to backing store.
+ *	The range is typically clipped at b_bcount ( not b_bufsize ).
+ *
+ *	b_resid.  Number of bytes remaining in I/O.  After an I/O operation
+ *	completes, b_resid is usually 0 indicating 100% success.
+ *
+ *	All fields are protected by the buffer lock except those marked:
+ *		V - Protected by owning bufobj lock
+ *		Q - Protected by the buf queue lock
+ *		D - Protected by an dependency implementation specific lock
+ */
+struct buf {
+	struct bufobj	*b_bufobj;
+	long		b_bcount;
+	void		*b_caller1;
+	caddr_t		b_data;
+	int		b_error;
+	uint8_t		b_iocmd;
+	uint8_t		b_ioflags;
+	off_t		b_iooffset;
+	long		b_resid;
+	void	(*b_iodone)(struct buf *);
+	daddr_t b_blkno;		/* Underlying physical block number. */
+	off_t	b_offset;		/* Offset into file. */
+	TAILQ_ENTRY(buf) b_bobufs;	/* (V) Buffer's associated vnode. */
+	struct buf	*b_left;	/* (V) splay tree link */
+	struct buf	*b_right;	/* (V) splay tree link */
+	uint32_t	b_vflags;	/* (V) BV_* flags */
+	TAILQ_ENTRY(buf) b_freelist;	/* (Q) Free list position inactive. */
+	unsigned short b_qindex;	/* (Q) buffer queue index */
+	uint32_t	b_flags;	/* B_* flags. */
+	b_xflags_t b_xflags;		/* extra flags */
+	struct lock b_lock;		/* Buffer lock */
+	long	b_bufsize;		/* Allocated buffer size. */
+	long	b_runningbufspace;	/* when I/O is running, pipelining */
+	caddr_t	b_kvabase;		/* base kva for buffer */
+	int	b_kvasize;		/* size of kva for buffer */
+	daddr_t b_lblkno;		/* Logical block number. */
+	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. */
+	void	*b_saveaddr;		/* Original b_addr for physio. */
+	union	pager_info {
+		int	pg_reqpage;
+	} b_pager;
+	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;
+	struct	workhead b_dep;		/* (D) List of filesystem dependencies. */
+	void	*b_fsprivate1;
+	void	*b_fsprivate2;
+	void	*b_fsprivate3;
+	int	b_pin_count;
+};
+
+#define b_object	b_bufobj->bo_object
+
+/*
+ * These flags are kept in b_flags.
+ *
+ * Notes:
+ *
+ *	B_ASYNC		VOP calls on bp's are usually async whether or not
+ *			B_ASYNC is set, but some subsystems, such as NFS, like 
+ *			to know what is best for the caller so they can
+ *			optimize the I/O.
+ *
+ *	B_PAGING	Indicates that bp is being used by the paging system or
+ *			some paging system and that the bp is not linked into
+ *			the b_vp's clean/dirty linked lists or ref counts.
+ *			Buffer vp reassignments are illegal in this case.
+ *
+ *	B_CACHE		This may only be set if the buffer is entirely valid.
+ *			The situation where B_DELWRI is set and B_CACHE is
+ *			clear MUST be committed to disk by getblk() so 
+ *			B_DELWRI can also be cleared.  See the comments for
+ *			getblk() in kern/vfs_bio.c.  If B_CACHE is clear,
+ *			the caller is expected to clear BIO_ERROR and B_INVAL,
+ *			set BIO_READ, and initiate an I/O.
+ *
+ *			The 'entire buffer' is defined to be the range from
+ *			0 through b_bcount.
+ *
+ *	B_MALLOC	Request that the buffer be allocated from the malloc
+ *			pool, DEV_BSIZE aligned instead of PAGE_SIZE aligned.
+ *
+ *	B_CLUSTEROK	This flag is typically set for B_DELWRI buffers
+ *			by filesystems that allow clustering when the buffer
+ *			is fully dirty and indicates that it may be clustered
+ *			with other adjacent dirty buffers.  Note the clustering
+ *			may not be used with the stage 1 data write under NFS
+ *			but may be used for the commit rpc portion.
+ *
+ *	B_VMIO		Indicates that the buffer is tied into an VM object.
+ *			The buffer's data is always PAGE_SIZE aligned even
+ *			if b_bufsize and b_bcount are not.  ( b_bufsize is 
+ *			always at least DEV_BSIZE aligned, though ).
+ *
+ *	B_DIRECT	Hint that we should attempt to completely free
+ *			the pages underlying the buffer.  B_DIRECT is
+ *			sticky until the buffer is released and typically
+ *			only has an effect when B_RELBUF is also set.
+ *
+ */
+
+#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_DIRECT	0x00000008	/* direct I/O flag (pls free vmio) */
+#define	B_DEFERRED	0x00000010	/* Skipped over for cleaning */
+#define	B_CACHE		0x00000020	/* Bread found us in the cache. */
+#define	B_VALIDSUSPWRT	0x00000040	/* Valid write during suspension. */
+#define	B_DELWRI	0x00000080	/* Delay I/O until buffer reused. */
+#define	B_PERSISTENT	0x00000100	/* Perm. ref'ed while EXT2FS mounted. */
+#define	B_DONE		0x00000200	/* I/O completed. */
+#define	B_EINTR		0x00000400	/* I/O was interrupted */
+#define	B_00000800	0x00000800	/* Available flag. */
+#define	B_00001000	0x00001000	/* Available flag. */
+#define	B_INVAL		0x00002000	/* Does not contain valid info. */
+#define	B_00004000	0x00004000	/* Available flag. */
+#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_000400000	0x00040000	/* Available flag. */
+#define	B_000800000	0x00080000	/* Available flag. */
+#define	B_00100000	0x00100000	/* Available flag. */
+#define	B_DIRTY		0x00200000	/* Needs writing later (in EXT2FS). */
+#define	B_RELBUF	0x00400000	/* Release VMIO buffer. */
+#define	B_00800000	0x00800000	/* Available flag. */
+#define	B_01000000	0x01000000	/* Available flag. */
+#define	B_NEEDSGIANT	0x02000000	/* Buffer's vnode needs giant. */
+#define	B_PAGING	0x04000000	/* volatile paging I/O -- bypass VMIO */
+#define B_MANAGED	0x08000000	/* Managed by FS. */
+#define B_RAM		0x10000000	/* Read ahead mark (flag) */
+#define B_VMIO		0x20000000	/* VMIO flag */
+#define B_CLUSTER	0x40000000	/* pagein op, so swap() can count it */
+#define B_REMFREE	0x80000000	/* Delayed bremfree */
+
+#define PRINT_BUF_FLAGS "\20\40remfree\37cluster\36vmio\35ram\34b27" \
+	"\33paging\32b25\31b24\30b23\27relbuf\26dirty\25b20" \
+	"\24b19\23b18\22clusterok\21malloc\20nocache\17b14\16inval" \
+	"\15b12\14b11\13eintr\12done\11persist\10delwri\7validsuspwrt" \
+	"\6cache\5deferred\4direct\3async\2needcommit\1age"
+
+/*
+ * These flags are kept in b_xflags.
+ */
+#define	BX_VNDIRTY	0x00000001	/* On vnode dirty list */
+#define	BX_VNCLEAN	0x00000002	/* On vnode clean list */
+#define	BX_BKGRDWRITE	0x00000010	/* Do writes in background */
+#define BX_BKGRDMARKER	0x00000020	/* Mark buffer for splay tree */
+#define	BX_ALTDATA	0x00000040	/* Holds extended data */
+
+#define	NOOFFSET	(-1LL)		/* No buffer offset calculated yet */
+
+/*
+ * These flags are kept in b_vflags.
+ */
+#define	BV_SCANNED	0x00000001	/* VOP_FSYNC funcs mark written bufs */
+#define	BV_BKGRDINPROG	0x00000002	/* Background write in progress */
+#define	BV_BKGRDWAIT	0x00000004	/* Background write waiting */
+#define	BV_INFREECNT	0x80000000	/* buf is counted in numfreebufs */
+
+#ifdef _KERNEL
+/*
+ * Buffer locking
+ */
+extern const char *buf_wmesg;		/* Default buffer lock message */
+#define BUF_WMESG "bufwait"
+#include <freebsd/sys/proc.h>			/* XXX for curthread */
+#include <freebsd/sys/mutex.h>
+
+/*
+ * Initialize a lock.
+ */
+#define BUF_LOCKINIT(bp)						\
+	lockinit(&(bp)->b_lock, PRIBIO + 4, buf_wmesg, 0, 0)
+/*
+ *
+ * Get a lock sleeping non-interruptably until it becomes available.
+ */
+#define	BUF_LOCK(bp, locktype, interlock)				\
+	_lockmgr_args(&(bp)->b_lock, (locktype), (interlock),		\
+	    LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT,		\
+	    LOCK_FILE, LOCK_LINE)
+
+/*
+ * Get a lock sleeping with specified interruptably and timeout.
+ */
+#define	BUF_TIMELOCK(bp, locktype, interlock, wmesg, catch, timo)	\
+	_lockmgr_args(&(bp)->b_lock, (locktype) | LK_TIMELOCK,		\
+	    (interlock), (wmesg), (PRIBIO + 4) | (catch), (timo),	\
+	    LOCK_FILE, LOCK_LINE)
+
+/*
+ * Release a lock. Only the acquiring process may free the lock unless
+ * it has been handed off to biodone.
+ */
+#define	BUF_UNLOCK(bp) do {						\
+	KASSERT(((bp)->b_flags & B_REMFREE) == 0,			\
+	    ("BUF_UNLOCK %p while B_REMFREE is still set.", (bp)));	\
+									\
+	(void)_lockmgr_args(&(bp)->b_lock, LK_RELEASE, NULL,		\
+	    LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT,		\
+	    LOCK_FILE, LOCK_LINE);					\
+} while (0)
+
+/*
+ * Check if a buffer lock is recursed.
+ */
+#define	BUF_LOCKRECURSED(bp)						\
+	lockmgr_recursed(&(bp)->b_lock)
+
+/*
+ * Check if a buffer lock is currently held.
+ */
+#define	BUF_ISLOCKED(bp)						\
+	lockstatus(&(bp)->b_lock)
+/*
+ * Free a buffer lock.
+ */
+#define BUF_LOCKFREE(bp) 						\
+	lockdestroy(&(bp)->b_lock)
+
+/*
+ * Buffer lock assertions.
+ */
+#if defined(INVARIANTS) && defined(INVARIANT_SUPPORT)
+#define	BUF_ASSERT_LOCKED(bp)						\
+	_lockmgr_assert(&(bp)->b_lock, KA_LOCKED, LOCK_FILE, LOCK_LINE)
+#define	BUF_ASSERT_SLOCKED(bp)						\
+	_lockmgr_assert(&(bp)->b_lock, KA_SLOCKED, LOCK_FILE, LOCK_LINE)
+#define	BUF_ASSERT_XLOCKED(bp)						\
+	_lockmgr_assert(&(bp)->b_lock, KA_XLOCKED, LOCK_FILE, LOCK_LINE)
+#define	BUF_ASSERT_UNLOCKED(bp)						\
+	_lockmgr_assert(&(bp)->b_lock, KA_UNLOCKED, LOCK_FILE, LOCK_LINE)
+#define	BUF_ASSERT_HELD(bp)
+#define	BUF_ASSERT_UNHELD(bp)
+#else
+#define	BUF_ASSERT_LOCKED(bp)
+#define	BUF_ASSERT_SLOCKED(bp)
+#define	BUF_ASSERT_XLOCKED(bp)
+#define	BUF_ASSERT_UNLOCKED(bp)
+#define	BUF_ASSERT_HELD(bp)
+#define	BUF_ASSERT_UNHELD(bp)
+#endif
+
+#ifdef _SYS_PROC_HH_	/* Avoid #include <freebsd/sys/proc.h> pollution */
+/*
+ * When initiating asynchronous I/O, change ownership of the lock to the
+ * kernel. Once done, the lock may legally released by biodone. The
+ * original owning process can no longer acquire it recursively, but must
+ * wait until the I/O is completed and the lock has been freed by biodone.
+ */
+#define	BUF_KERNPROC(bp)						\
+	_lockmgr_disown(&(bp)->b_lock, LOCK_FILE, LOCK_LINE)
+#endif
+
+/*
+ * Find out if the lock has waiters or not.
+ */
+#define	BUF_LOCKWAITERS(bp)						\
+	lockmgr_waiters(&(bp)->b_lock)
+
+#endif /* _KERNEL */
+
+struct buf_queue_head {
+	TAILQ_HEAD(buf_queue, buf) queue;
+	daddr_t last_pblkno;
+	struct	buf *insert_point;
+	struct	buf *switch_point;
+};
+
+/*
+ * 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. */
+};
+
+#ifdef _KERNEL
+
+static __inline int
+bwrite(struct buf *bp)
+{
+
+	KASSERT(bp->b_bufobj != NULL, ("bwrite: no bufobj bp=%p", bp));
+	KASSERT(bp->b_bufobj->bo_ops != NULL, ("bwrite: no bo_ops bp=%p", bp));
+	KASSERT(bp->b_bufobj->bo_ops->bop_write != NULL,
+	    ("bwrite: no bop_write bp=%p", bp));
+	return (BO_WRITE(bp->b_bufobj, bp));
+}
+
+static __inline void
+bstrategy(struct buf *bp)
+{
+
+	KASSERT(bp->b_bufobj != NULL, ("bstrategy: no bufobj bp=%p", bp));
+	KASSERT(bp->b_bufobj->bo_ops != NULL,
+	    ("bstrategy: no bo_ops bp=%p", bp));
+	KASSERT(bp->b_bufobj->bo_ops->bop_strategy != NULL,
+	    ("bstrategy: no bop_strategy bp=%p", bp));
+	BO_STRATEGY(bp->b_bufobj, bp);
+}
+
+static __inline void
+buf_start(struct buf *bp)
+{
+	if (bioops.io_start)
+		(*bioops.io_start)(bp);
+}
+
+static __inline void
+buf_complete(struct buf *bp)
+{
+	if (bioops.io_complete)
+		(*bioops.io_complete)(bp);
+}
+
+static __inline void
+buf_deallocate(struct buf *bp)
+{
+	if (bioops.io_deallocate)
+		(*bioops.io_deallocate)(bp);
+	BUF_LOCKFREE(bp);
+}
+
+static __inline int
+buf_countdeps(struct buf *bp, int i)
+{
+	if (bioops.io_countdeps)
+		return ((*bioops.io_countdeps)(bp, i));
+	else
+		return (0);
+}
+
+#endif /* _KERNEL */
+
+/*
+ * Zero out the buffer's data area.
+ */
+#define	clrbuf(bp) {							\
+	bzero((bp)->b_data, (u_int)(bp)->b_bcount);			\
+	(bp)->b_resid = 0;						\
+}
+
+/*
+ * Flags for getblk's last parameter.
+ */
+#define	GB_LOCK_NOWAIT	0x0001		/* Fail if we block on a buf lock. */
+#define	GB_NOCREAT	0x0002		/* Don't create a buf if not found. */
+#define	GB_NOWAIT_BD	0x0004		/* Do not wait for bufdaemon */
+
+#ifdef _KERNEL
+extern int	nbuf;			/* The number of buffer headers */
+extern long	maxswzone;		/* Max KVA for swap structures */
+extern long	maxbcache;		/* Max KVA for buffer cache */
+extern long	runningbufspace;
+extern long	hibufspace;
+extern int	dirtybufthresh;
+extern int	bdwriteskip;
+extern int	dirtybufferflushes;
+extern int	altbufferflushes;
+extern int      buf_maxio;              /* nominal maximum I/O for buffer */
+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 int	cluster_pbuf_freecnt;	/* Number of pbufs for clusters */
+extern int	vnode_pbuf_freecnt;	/* Number of pbufs for vnode pager */
+
+void	runningbufwakeup(struct buf *);
+void	waitrunningbufspace(void);
+caddr_t	kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est);
+void	bufinit(void);
+void	bwillwrite(void);
+int	buf_dirty_count_severe(void);
+void	bremfree(struct buf *);
+void	bremfreef(struct buf *);	/* XXX Force bremfree, only for nfs. */
+int	bread(struct vnode *, daddr_t, int, struct ucred *, struct buf **);
+void	breada(struct vnode *, daddr_t *, int *, int, struct ucred *);
+int	breadn(struct vnode *, daddr_t, int, daddr_t *, int *, int,
+	    struct ucred *, struct buf **);
+void	bdwrite(struct buf *);
+void	bawrite(struct buf *);
+void	bdirty(struct buf *);
+void	bundirty(struct buf *);
+void	bufstrategy(struct bufobj *, struct buf *);
+void	brelse(struct buf *);
+void	bqrelse(struct buf *);
+int	vfs_bio_awrite(struct buf *);
+struct buf *     getpbuf(int *);
+struct buf *incore(struct bufobj *, daddr_t);
+struct buf *gbincore(struct bufobj *, daddr_t);
+struct buf *getblk(struct vnode *, daddr_t, int, int, int, int);
+struct buf *geteblk(int, int);
+int	bufwait(struct buf *);
+int	bufwrite(struct buf *);
+void	bufdone(struct buf *);
+void	bufdone_finish(struct buf *);
+
+int	cluster_read(struct vnode *, u_quad_t, daddr_t, long,
+	    struct ucred *, long, int, struct buf **);
+int	cluster_wbuild(struct vnode *, long, daddr_t, int);
+void	cluster_write(struct vnode *, struct buf *, u_quad_t, int);
+void	vfs_bio_set_valid(struct buf *, int base, int size);
+void	vfs_bio_clrbuf(struct buf *);
+void	vfs_busy_pages(struct buf *, int clear_modify);
+void	vfs_unbusy_pages(struct buf *);
+int	vmapbuf(struct buf *);
+void	vunmapbuf(struct buf *);
+void	relpbuf(struct buf *, int *);
+void	brelvp(struct buf *);
+void	bgetvp(struct vnode *, struct buf *);
+void	pbgetbo(struct bufobj *bo, struct buf *bp);
+void	pbgetvp(struct vnode *, struct buf *);
+void	pbrelbo(struct buf *);
+void	pbrelvp(struct buf *);
+int	allocbuf(struct buf *bp, int size);
+void	reassignbuf(struct buf *);
+struct	buf *trypbuf(int *);
+void	bwait(struct buf *, u_char, const char *);
+void	bdone(struct buf *);
+void	bpin(struct buf *);
+void	bunpin(struct buf *);
+void 	bunpin_wait(struct buf *);
+
+#endif /* _KERNEL */
+
+#endif /* !_SYS_BUF_HH_ */