patch-2.4.27 linux-2.4.27/fs/xfs/linux-2.4/xfs_buf.h

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diff -urN linux-2.4.26/fs/xfs/linux-2.4/xfs_buf.h linux-2.4.27/fs/xfs/linux-2.4/xfs_buf.h
@@ -0,0 +1,633 @@
+/*
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+/*
+ * Written by Steve Lord, Jim Mostek, Russell Cattelan at SGI
+ */
+
+#ifndef __XFS_BUF_H__
+#define __XFS_BUF_H__
+
+#include <linux/version.h>
+#include <linux/config.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <asm/system.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/uio.h>
+
+/* nptl patch changes where the sigmask_lock is defined */
+#ifdef CLONE_SIGNAL /* stock */
+#define sigmask_lock()		spin_lock_irq(&current->sigmask_lock);
+#define sigmask_unlock()	spin_unlock_irq(&current->sigmask_lock);
+#define __recalc_sigpending(x)	recalc_sigpending(x)
+#else /* nptl */
+#define sigmask_lock()		spin_lock_irq(&current->sighand->siglock);
+#define sigmask_unlock()	spin_unlock_irq(&current->sighand->siglock);
+#define __recalc_sigpending(x)	recalc_sigpending()
+#endif
+/*
+ *	Base types
+ */
+
+#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
+
+#define page_buf_ctob(pp)	((pp) * PAGE_CACHE_SIZE)
+#define page_buf_btoc(dd)	(((dd) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)
+#define page_buf_btoct(dd)	((dd) >> PAGE_CACHE_SHIFT)
+#define page_buf_poff(aa)	((aa) & ~PAGE_CACHE_MASK)
+
+typedef enum page_buf_rw_e {
+	PBRW_READ = 1,			/* transfer into target memory */
+	PBRW_WRITE = 2,			/* transfer from target memory */
+	PBRW_ZERO = 3			/* Zero target memory */
+} page_buf_rw_t;
+
+
+typedef enum page_buf_flags_e {		/* pb_flags values */
+	PBF_READ = (1 << 0),	/* buffer intended for reading from device */
+	PBF_WRITE = (1 << 1),	/* buffer intended for writing to device   */
+	PBF_MAPPED = (1 << 2),  /* buffer mapped (pb_addr valid)           */
+	PBF_PARTIAL = (1 << 3), /* buffer partially read                   */
+	PBF_ASYNC = (1 << 4),   /* initiator will not wait for completion  */
+	PBF_NONE = (1 << 5),    /* buffer not read at all                  */
+	PBF_DELWRI = (1 << 6),  /* buffer has dirty pages                  */
+	PBF_STALE = (1 << 7),	/* buffer has been staled, do not find it  */
+	PBF_FS_MANAGED = (1 << 8),  /* filesystem controls freeing memory  */
+	PBF_FS_DATAIOD = (1 << 9),  /* schedule IO completion on fs datad  */
+	PBF_FORCEIO = (1 << 10),    /* ignore any cache state		   */
+	PBF_FLUSH = (1 << 11),	    /* flush disk write cache		   */
+	PBF_READ_AHEAD = (1 << 12), /* asynchronous read-ahead		   */
+	PBF_DIRECTIO = (1 << 13),   /* used for a direct IO mapping	   */
+
+	/* flags used only as arguments to access routines */
+	PBF_LOCK = (1 << 14),       /* lock requested			   */
+	PBF_TRYLOCK = (1 << 15),    /* lock requested, but do not wait	   */
+	PBF_DONT_BLOCK = (1 << 16), /* do not block in current thread	   */
+
+	/* flags used only internally */
+	_PBF_PAGE_CACHE = (1 << 17),/* backed by pagecache		   */
+	_PBF_KMEM_ALLOC = (1 << 18),/* backed by kmem_alloc()		   */
+	_PBF_RUN_QUEUES = (1 << 19),/* run block device task queue	   */
+	_PBF_PRIVATE_BH = (1 << 20),/* do not use public buffer heads	   */
+} page_buf_flags_t;
+
+#define PBF_UPDATE (PBF_READ | PBF_WRITE)
+#define PBF_NOT_DONE(pb) (((pb)->pb_flags & (PBF_PARTIAL|PBF_NONE)) != 0)
+#define PBF_DONE(pb) (((pb)->pb_flags & (PBF_PARTIAL|PBF_NONE)) == 0)
+
+#define PBR_SECTOR_ONLY	1	/* only use sector size buffer heads */
+#define PBR_ALIGNED_ONLY 2	/* only use aligned I/O */
+
+typedef struct xfs_buftarg {
+	int			pbr_flags;
+	dev_t			pbr_dev;
+	kdev_t			pbr_kdev;
+	struct block_device	*pbr_bdev;
+	struct address_space	*pbr_mapping;
+	unsigned int		pbr_bsize;
+	unsigned int		pbr_sshift;
+	size_t			pbr_smask;
+} xfs_buftarg_t;
+
+/*
+ *	xfs_buf_t:  Buffer structure for page cache-based buffers
+ *
+ * This buffer structure is used by the page cache buffer management routines
+ * to refer to an assembly of pages forming a logical buffer.  The actual I/O
+ * is performed with buffer_head structures, as required by drivers.
+ * 
+ * The buffer structure is used on temporary basis only, and discarded when
+ * released.  The real data storage is recorded in the page cache.  Metadata is
+ * hashed to the block device on which the file system resides.
+ */
+
+struct xfs_buf;
+
+/* call-back function on I/O completion */
+typedef void (*page_buf_iodone_t)(struct xfs_buf *);
+/* call-back function on I/O completion */
+typedef void (*page_buf_relse_t)(struct xfs_buf *);
+/* pre-write function */
+typedef int (*page_buf_bdstrat_t)(struct xfs_buf *);
+
+#define PB_PAGES	4
+
+typedef struct xfs_buf {
+	struct semaphore	pb_sema;	/* semaphore for lockables  */
+	unsigned long		pb_queuetime;	/* time buffer was queued   */
+	atomic_t		pb_pin_count;	/* pin count		    */
+	wait_queue_head_t	pb_waiters;	/* unpin waiters	    */
+	struct list_head	pb_list;
+	page_buf_flags_t	pb_flags;	/* status flags */
+	struct list_head	pb_hash_list;
+	xfs_buftarg_t		*pb_target;	/* logical object */
+	atomic_t		pb_hold;	/* reference count */
+	xfs_daddr_t		pb_bn;		/* block number for I/O */
+	loff_t			pb_file_offset;	/* offset in file */
+	size_t			pb_buffer_length; /* size of buffer in bytes */
+	size_t			pb_count_desired; /* desired transfer size */
+	void			*pb_addr;	/* virtual address of buffer */
+	struct tq_struct	pb_iodone_sched;
+	atomic_t		pb_io_remaining;/* #outstanding I/O requests */
+	page_buf_iodone_t	pb_iodone;	/* I/O completion function */
+	page_buf_relse_t	pb_relse;	/* releasing function */
+	page_buf_bdstrat_t	pb_strat;	/* pre-write function */
+	struct semaphore	pb_iodonesema;	/* Semaphore for I/O waiters */
+	void			*pb_fspriv;
+	void			*pb_fspriv2;
+	void			*pb_fspriv3;
+	unsigned short		pb_error;	/* error code on I/O */
+	unsigned short		pb_page_count;	/* size of page array */
+	unsigned short		pb_offset;	/* page offset in first page */
+	unsigned char		pb_locked;	/* page array is locked */
+	unsigned char		pb_hash_index;	/* hash table index	*/
+	struct page		**pb_pages;	/* array of page pointers */
+	struct page		*pb_page_array[PB_PAGES]; /* inline pages */
+#ifdef PAGEBUF_LOCK_TRACKING
+	int			pb_last_holder;
+#endif
+} xfs_buf_t;
+
+
+/* Finding and Reading Buffers */
+
+extern xfs_buf_t *pagebuf_find(	/* find buffer for block if	*/
+					/* the block is in memory	*/
+		xfs_buftarg_t *,	/* inode for block		*/
+		loff_t,			/* starting offset of range	*/
+		size_t,			/* length of range		*/
+		page_buf_flags_t);	/* PBF_LOCK			*/
+
+extern xfs_buf_t *pagebuf_get(		/* allocate a buffer		*/
+		xfs_buftarg_t *,	/* inode for buffer		*/
+		loff_t,			/* starting offset of range     */
+		size_t,			/* length of range              */
+		page_buf_flags_t);	/* PBF_LOCK, PBF_READ,		*/
+					/* PBF_ASYNC			*/
+
+extern xfs_buf_t *pagebuf_lookup(
+		xfs_buftarg_t *,
+		loff_t,			/* starting offset of range	*/
+		size_t,			/* length of range		*/
+		page_buf_flags_t);	/* PBF_READ, PBF_WRITE,		*/
+					/* PBF_FORCEIO, 		*/
+
+extern xfs_buf_t *pagebuf_get_empty(	/* allocate pagebuf struct with	*/
+					/*  no memory or disk address	*/
+		size_t len,
+		xfs_buftarg_t *);	/* mount point "fake" inode	*/
+
+extern xfs_buf_t *pagebuf_get_no_daddr(/* allocate pagebuf struct	*/
+					/* without disk address		*/
+		size_t len,
+		xfs_buftarg_t *);	/* mount point "fake" inode	*/
+
+extern int pagebuf_associate_memory(
+		xfs_buf_t *,
+		void *,
+		size_t);
+
+extern void pagebuf_hold(		/* increment reference count	*/
+		xfs_buf_t *);		/* buffer to hold		*/
+
+extern void pagebuf_readahead(		/* read ahead into cache	*/
+		xfs_buftarg_t  *,	/* target for buffer (or NULL)	*/
+		loff_t,			/* starting offset of range     */
+		size_t,			/* length of range              */
+		page_buf_flags_t);	/* additional read flags	*/
+
+/* Releasing Buffers */
+
+extern void pagebuf_free(		/* deallocate a buffer		*/
+		xfs_buf_t *);		/* buffer to deallocate		*/
+
+extern void pagebuf_rele(		/* release hold on a buffer	*/
+		xfs_buf_t *);		/* buffer to release		*/
+
+/* Locking and Unlocking Buffers */
+
+extern int pagebuf_cond_lock(		/* lock buffer, if not locked	*/
+					/* (returns -EBUSY if locked)	*/
+		xfs_buf_t *);		/* buffer to lock		*/
+
+extern int pagebuf_lock_value(		/* return count on lock		*/
+		xfs_buf_t *);          /* buffer to check              */
+
+extern int pagebuf_lock(		/* lock buffer                  */
+		xfs_buf_t *);          /* buffer to lock               */
+
+extern void pagebuf_unlock(		/* unlock buffer		*/
+		xfs_buf_t *);		/* buffer to unlock		*/
+
+/* Buffer Read and Write Routines */
+
+extern void pagebuf_iodone(		/* mark buffer I/O complete	*/
+		xfs_buf_t *,		/* buffer to mark		*/
+		int,			/* use data/log helper thread.	*/
+		int);			/* run completion locally, or in
+					 * a helper thread.		*/
+
+extern void pagebuf_ioerror(		/* mark buffer in error	(or not) */
+		xfs_buf_t *,		/* buffer to mark		*/
+		int);			/* error to store (0 if none)	*/
+
+extern int pagebuf_iostart(		/* start I/O on a buffer	*/
+		xfs_buf_t *,		/* buffer to start		*/
+		page_buf_flags_t);	/* PBF_LOCK, PBF_ASYNC,		*/
+					/* PBF_READ, PBF_WRITE,		*/
+					/* PBF_DELWRI			*/
+
+extern int pagebuf_iorequest(		/* start real I/O		*/
+		xfs_buf_t *);		/* buffer to convey to device	*/
+
+extern int pagebuf_iowait(		/* wait for buffer I/O done	*/
+		xfs_buf_t *);		/* buffer to wait on		*/
+
+extern void pagebuf_iomove(		/* move data in/out of pagebuf	*/
+		xfs_buf_t *,		/* buffer to manipulate		*/
+		size_t,			/* starting buffer offset	*/
+		size_t,			/* length in buffer		*/
+		caddr_t,		/* data pointer			*/
+		page_buf_rw_t);		/* direction			*/
+
+static inline int pagebuf_iostrategy(xfs_buf_t *pb)
+{
+	return pb->pb_strat ? pb->pb_strat(pb) : pagebuf_iorequest(pb);
+}
+
+static inline int pagebuf_geterror(xfs_buf_t *pb)
+{
+	return pb ? pb->pb_error : ENOMEM;
+}
+
+/* Buffer Utility Routines */
+
+extern caddr_t pagebuf_offset(		/* pointer at offset in buffer	*/
+		xfs_buf_t *,		/* buffer to offset into	*/
+		size_t);		/* offset			*/
+
+/* Pinning Buffer Storage in Memory */
+
+extern void pagebuf_pin(		/* pin buffer in memory		*/
+		xfs_buf_t *);		/* buffer to pin		*/
+
+extern void pagebuf_unpin(		/* unpin buffered data		*/
+		xfs_buf_t *);		/* buffer to unpin		*/
+
+extern int pagebuf_ispin(		/* check if buffer is pinned	*/
+		xfs_buf_t *);		/* buffer to check		*/
+
+/* Delayed Write Buffer Routines */
+
+extern void pagebuf_delwri_dequeue(xfs_buf_t *);
+
+/* Buffer Daemon Setup Routines */
+
+extern int pagebuf_init(void);
+extern void pagebuf_terminate(void);
+
+
+#ifdef PAGEBUF_TRACE
+extern ktrace_t *pagebuf_trace_buf;
+extern void pagebuf_trace(
+		xfs_buf_t *,		/* buffer being traced		*/
+		char *,			/* description of operation	*/
+		void *,			/* arbitrary diagnostic value	*/
+		void *);		/* return address		*/
+#else
+# define pagebuf_trace(pb, id, ptr, ra)	do { } while (0)
+#endif
+
+#define pagebuf_target_name(target)	bdevname((target)->pbr_kdev)
+
+/*
+ * Kernel version compatibility macros
+ */
+
+#define page_buffers(page)	((page)->buffers)
+#define page_has_buffers(page)	((page)->buffers)
+#define PageUptodate(x)		Page_Uptodate(x)
+/*
+ * macro tricks to expand the set_buffer_foo() and clear_buffer_foo()
+ * functions.
+ */
+#define BUFFER_FNS(bit, name)						\
+static inline void set_buffer_##name(struct buffer_head *bh)		\
+{									\
+	set_bit(BH_##bit, &(bh)->b_state);				\
+}									\
+static inline void clear_buffer_##name(struct buffer_head *bh)		\
+{									\
+	clear_bit(BH_##bit, &(bh)->b_state);				\
+}									\
+
+/*
+ * Emit the buffer bitops functions.   Note that there are also functions
+ * of the form "mark_buffer_foo()".  These are higher-level functions which
+ * do something in addition to setting a b_state bit.
+ */
+BUFFER_FNS(Uptodate, uptodate)
+BUFFER_FNS(Dirty, dirty)
+BUFFER_FNS(Lock, locked)
+BUFFER_FNS(Req, req)
+BUFFER_FNS(Mapped, mapped)
+BUFFER_FNS(New, new)
+BUFFER_FNS(Async, async)
+BUFFER_FNS(Wait_IO, wait_io)
+BUFFER_FNS(Launder, launder)
+BUFFER_FNS(Sync, sync)
+BUFFER_FNS(Delay, delay)
+
+#define get_seconds()		CURRENT_TIME
+#define i_size_read(inode)	((inode)->i_size)
+#define i_size_write(inode, sz)	((inode)->i_size = (sz))
+
+/* These are just for xfs_syncsub... it sets an internal variable
+ * then passes it to VOP_FLUSH_PAGES or adds the flags to a newly gotten buf_t
+ */
+#define XFS_B_ASYNC		PBF_ASYNC
+#define XFS_B_DELWRI		PBF_DELWRI
+#define XFS_B_READ		PBF_READ
+#define XFS_B_WRITE		PBF_WRITE
+#define XFS_B_STALE		PBF_STALE
+
+#define XFS_BUF_TRYLOCK		PBF_TRYLOCK
+#define XFS_INCORE_TRYLOCK	PBF_TRYLOCK
+#define XFS_BUF_LOCK		PBF_LOCK
+#define XFS_BUF_MAPPED		PBF_MAPPED
+
+#define BUF_BUSY		PBF_DONT_BLOCK
+
+#define XFS_BUF_BFLAGS(x)	((x)->pb_flags)
+#define XFS_BUF_ZEROFLAGS(x)	\
+	((x)->pb_flags &= ~(PBF_READ|PBF_WRITE|PBF_ASYNC|PBF_DELWRI))
+
+#define XFS_BUF_STALE(x)	((x)->pb_flags |= XFS_B_STALE)
+#define XFS_BUF_UNSTALE(x)	((x)->pb_flags &= ~XFS_B_STALE)
+#define XFS_BUF_ISSTALE(x)	((x)->pb_flags & XFS_B_STALE)
+#define XFS_BUF_SUPER_STALE(x)	do {				\
+					XFS_BUF_STALE(x);	\
+					pagebuf_delwri_dequeue(x);	\
+					XFS_BUF_DONE(x);	\
+				} while (0)
+
+#define XFS_BUF_MANAGE		PBF_FS_MANAGED
+#define XFS_BUF_UNMANAGE(x)	((x)->pb_flags &= ~PBF_FS_MANAGED)
+
+#define XFS_BUF_DELAYWRITE(x)	 ((x)->pb_flags |= PBF_DELWRI)
+#define XFS_BUF_UNDELAYWRITE(x)	 pagebuf_delwri_dequeue(x)
+#define XFS_BUF_ISDELAYWRITE(x)	 ((x)->pb_flags & PBF_DELWRI)
+
+#define XFS_BUF_ERROR(x,no)	 pagebuf_ioerror(x,no)
+#define XFS_BUF_GETERROR(x)	 pagebuf_geterror(x)
+#define XFS_BUF_ISERROR(x)	 (pagebuf_geterror(x)?1:0)
+
+#define XFS_BUF_DONE(x)		 ((x)->pb_flags &= ~(PBF_PARTIAL|PBF_NONE))
+#define XFS_BUF_UNDONE(x)	 ((x)->pb_flags |= PBF_PARTIAL|PBF_NONE)
+#define XFS_BUF_ISDONE(x)	 (!(PBF_NOT_DONE(x)))
+
+#define XFS_BUF_BUSY(x)		 ((x)->pb_flags |= PBF_FORCEIO)
+#define XFS_BUF_UNBUSY(x)	 ((x)->pb_flags &= ~PBF_FORCEIO)
+#define XFS_BUF_ISBUSY(x)	 (1)
+
+#define XFS_BUF_ASYNC(x)	 ((x)->pb_flags |= PBF_ASYNC)
+#define XFS_BUF_UNASYNC(x)	 ((x)->pb_flags &= ~PBF_ASYNC)
+#define XFS_BUF_ISASYNC(x)	 ((x)->pb_flags & PBF_ASYNC)
+
+#define XFS_BUF_FLUSH(x)	 ((x)->pb_flags |= PBF_FLUSH)
+#define XFS_BUF_UNFLUSH(x)	 ((x)->pb_flags &= ~PBF_FLUSH)
+#define XFS_BUF_ISFLUSH(x)	 ((x)->pb_flags & PBF_FLUSH)
+
+#define XFS_BUF_SHUT(x)		 printk("XFS_BUF_SHUT not implemented yet\n")
+#define XFS_BUF_UNSHUT(x)	 printk("XFS_BUF_UNSHUT not implemented yet\n")
+#define XFS_BUF_ISSHUT(x)	 (0)
+
+#define XFS_BUF_HOLD(x)		pagebuf_hold(x)
+#define XFS_BUF_READ(x)		((x)->pb_flags |= PBF_READ)
+#define XFS_BUF_UNREAD(x)	((x)->pb_flags &= ~PBF_READ)
+#define XFS_BUF_ISREAD(x)	((x)->pb_flags & PBF_READ)
+
+#define XFS_BUF_WRITE(x)	((x)->pb_flags |= PBF_WRITE)
+#define XFS_BUF_UNWRITE(x)	((x)->pb_flags &= ~PBF_WRITE)
+#define XFS_BUF_ISWRITE(x)	((x)->pb_flags & PBF_WRITE)
+
+#define XFS_BUF_ISUNINITIAL(x)	 (0)
+#define XFS_BUF_UNUNINITIAL(x)	 (0)
+
+#define XFS_BUF_BP_ISMAPPED(bp)	 1
+
+#define XFS_BUF_DATAIO(x)	((x)->pb_flags |= PBF_FS_DATAIOD)
+#define XFS_BUF_UNDATAIO(x)	((x)->pb_flags &= ~PBF_FS_DATAIOD)
+
+#define XFS_BUF_IODONE_FUNC(buf)	(buf)->pb_iodone
+#define XFS_BUF_SET_IODONE_FUNC(buf, func)	\
+			(buf)->pb_iodone = (func)
+#define XFS_BUF_CLR_IODONE_FUNC(buf)		\
+			(buf)->pb_iodone = NULL
+#define XFS_BUF_SET_BDSTRAT_FUNC(buf, func)	\
+			(buf)->pb_strat = (func)
+#define XFS_BUF_CLR_BDSTRAT_FUNC(buf)		\
+			(buf)->pb_strat = NULL
+
+#define XFS_BUF_FSPRIVATE(buf, type)		\
+			((type)(buf)->pb_fspriv)
+#define XFS_BUF_SET_FSPRIVATE(buf, value)	\
+			(buf)->pb_fspriv = (void *)(value)
+#define XFS_BUF_FSPRIVATE2(buf, type)		\
+			((type)(buf)->pb_fspriv2)
+#define XFS_BUF_SET_FSPRIVATE2(buf, value)	\
+			(buf)->pb_fspriv2 = (void *)(value)
+#define XFS_BUF_FSPRIVATE3(buf, type)		\
+			((type)(buf)->pb_fspriv3)
+#define XFS_BUF_SET_FSPRIVATE3(buf, value)	\
+			(buf)->pb_fspriv3  = (void *)(value)
+#define XFS_BUF_SET_START(buf)
+
+#define XFS_BUF_SET_BRELSE_FUNC(buf, value) \
+			(buf)->pb_relse = (value)
+
+#define XFS_BUF_PTR(bp)		(xfs_caddr_t)((bp)->pb_addr)
+
+extern inline xfs_caddr_t xfs_buf_offset(xfs_buf_t *bp, size_t offset)
+{
+	if (bp->pb_flags & PBF_MAPPED)
+		return XFS_BUF_PTR(bp) + offset;
+	return (xfs_caddr_t) pagebuf_offset(bp, offset);
+}
+
+#define XFS_BUF_SET_PTR(bp, val, count)		\
+				pagebuf_associate_memory(bp, val, count)
+#define XFS_BUF_ADDR(bp)	((bp)->pb_bn)
+#define XFS_BUF_SET_ADDR(bp, blk)		\
+			((bp)->pb_bn = (xfs_daddr_t)(blk))
+#define XFS_BUF_OFFSET(bp)	((bp)->pb_file_offset)
+#define XFS_BUF_SET_OFFSET(bp, off)		\
+			((bp)->pb_file_offset = (off))
+#define XFS_BUF_COUNT(bp)	((bp)->pb_count_desired)
+#define XFS_BUF_SET_COUNT(bp, cnt)		\
+			((bp)->pb_count_desired = (cnt))
+#define XFS_BUF_SIZE(bp)	((bp)->pb_buffer_length)
+#define XFS_BUF_SET_SIZE(bp, cnt)		\
+			((bp)->pb_buffer_length = (cnt))
+#define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
+#define XFS_BUF_SET_VTYPE(bp, type)
+#define XFS_BUF_SET_REF(bp, ref)
+
+#define XFS_BUF_ISPINNED(bp)	pagebuf_ispin(bp)
+
+#define XFS_BUF_VALUSEMA(bp)	pagebuf_lock_value(bp)
+#define XFS_BUF_CPSEMA(bp)	(pagebuf_cond_lock(bp) == 0)
+#define XFS_BUF_VSEMA(bp)	pagebuf_unlock(bp)
+#define XFS_BUF_PSEMA(bp,x)	pagebuf_lock(bp)
+#define XFS_BUF_V_IODONESEMA(bp) up(&bp->pb_iodonesema);
+
+/* setup the buffer target from a buftarg structure */
+#define XFS_BUF_SET_TARGET(bp, target)	\
+		(bp)->pb_target = (target)
+#define XFS_BUF_TARGET(bp)	((bp)->pb_target)
+#define XFS_BUFTARG_NAME(target)	\
+		pagebuf_target_name(target)
+
+#define XFS_BUF_SET_VTYPE_REF(bp, type, ref)
+#define XFS_BUF_SET_VTYPE(bp, type)
+#define XFS_BUF_SET_REF(bp, ref)
+
+#define xfs_buf_read(target, blkno, len, flags) \
+		pagebuf_get((target), (blkno), (len), \
+			PBF_LOCK | PBF_READ | PBF_MAPPED)
+#define xfs_buf_get(target, blkno, len, flags) \
+		pagebuf_get((target), (blkno), (len), \
+			PBF_LOCK | PBF_MAPPED)
+
+#define xfs_buf_read_flags(target, blkno, len, flags) \
+		pagebuf_get((target), (blkno), (len), PBF_READ | (flags))
+#define xfs_buf_get_flags(target, blkno, len, flags) \
+		pagebuf_get((target), (blkno), (len), (flags))
+
+static inline int	xfs_bawrite(void *mp, xfs_buf_t *bp)
+{
+	bp->pb_fspriv3 = mp;
+	bp->pb_strat = xfs_bdstrat_cb;
+	pagebuf_delwri_dequeue(bp);
+	return pagebuf_iostart(bp, PBF_WRITE | PBF_ASYNC | _PBF_RUN_QUEUES);
+}
+
+static inline void	xfs_buf_relse(xfs_buf_t *bp)
+{
+	if (!bp->pb_relse)
+		pagebuf_unlock(bp);
+	pagebuf_rele(bp);
+}
+
+#define xfs_bpin(bp)		pagebuf_pin(bp)
+#define xfs_bunpin(bp)		pagebuf_unpin(bp)
+
+#define xfs_buftrace(id, bp)	\
+	    pagebuf_trace(bp, id, NULL, (void *)__builtin_return_address(0))
+
+#define xfs_biodone(pb)		    \
+	    pagebuf_iodone(pb, (pb->pb_flags & PBF_FS_DATAIOD), 0)
+
+#define xfs_incore(buftarg,blkno,len,lockit) \
+	    pagebuf_find(buftarg, blkno ,len, lockit)
+
+
+#define xfs_biomove(pb, off, len, data, rw) \
+	    pagebuf_iomove((pb), (off), (len), (data), \
+		((rw) == XFS_B_WRITE) ? PBRW_WRITE : PBRW_READ)
+
+#define xfs_biozero(pb, off, len) \
+	    pagebuf_iomove((pb), (off), (len), NULL, PBRW_ZERO)
+
+
+static inline int	XFS_bwrite(xfs_buf_t *pb)
+{
+	int	iowait = (pb->pb_flags & PBF_ASYNC) == 0;
+	int	error = 0;
+
+	if (!iowait)
+		pb->pb_flags |= _PBF_RUN_QUEUES;
+
+	pagebuf_delwri_dequeue(pb);
+	pagebuf_iostrategy(pb);
+	if (iowait) {
+		error = pagebuf_iowait(pb);
+		xfs_buf_relse(pb);
+	}
+	return error;
+}
+
+#define XFS_bdwrite(pb)		     \
+	    pagebuf_iostart(pb, PBF_DELWRI | PBF_ASYNC)
+
+static inline int xfs_bdwrite(void *mp, xfs_buf_t *bp)
+{
+	bp->pb_strat = xfs_bdstrat_cb;
+	bp->pb_fspriv3 = mp;
+
+	return pagebuf_iostart(bp, PBF_DELWRI | PBF_ASYNC);
+}
+
+#define XFS_bdstrat(bp) pagebuf_iorequest(bp)
+
+#define xfs_iowait(pb)	pagebuf_iowait(pb)
+
+#define xfs_baread(target, rablkno, ralen)  \
+	pagebuf_readahead((target), (rablkno), (ralen), PBF_DONT_BLOCK)
+
+#define xfs_buf_get_empty(len, target)	pagebuf_get_empty((len), (target))
+#define xfs_buf_get_noaddr(len, target)	pagebuf_get_no_daddr((len), (target))
+#define xfs_buf_free(bp)		pagebuf_free(bp)
+
+ /*
+  *	Handling of buftargs.
+  */
+ 
+extern xfs_buftarg_t *xfs_alloc_buftarg(struct block_device *);
+extern void xfs_free_buftarg(xfs_buftarg_t *, int);
+extern void xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int);
+extern void xfs_incore_relse(xfs_buftarg_t *, int, int);
+extern int xfs_flush_buftarg(xfs_buftarg_t *, int);
+
+#define xfs_getsize_buftarg(buftarg) \
+	block_size((buftarg)->pbr_kdev)
+#define xfs_readonly_buftarg(buftarg) \
+	is_read_only((buftarg)->pbr_kdev)
+#define xfs_binval(buftarg) \
+	xfs_flush_buftarg(buftarg, 1)
+#define XFS_bflush(buftarg) \
+	xfs_flush_buftarg(buftarg, 1)
+
+#endif	/* __XFS_BUF_H__ */
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TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)