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diff --git a/fs/xfs/xfs_rw.h b/fs/xfs/xfs_rw.h
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+/*
+ * Copyright (c) 2000-2003 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/
+ */
+#ifndef __XFS_RW_H__
+#define __XFS_RW_H__
+
+struct xfs_buf;
+struct xfs_inode;
+struct xfs_mount;
+
+/*
+ * Maximum count of bmaps used by read and write paths.
+ */
+#define XFS_MAX_RW_NBMAPS 4
+
+/*
+ * Counts of readahead buffers to use based on physical memory size.
+ * None of these should be more than XFS_MAX_RW_NBMAPS.
+ */
+#define XFS_RW_NREADAHEAD_16MB 2
+#define XFS_RW_NREADAHEAD_32MB 3
+#define XFS_RW_NREADAHEAD_K32 4
+#define XFS_RW_NREADAHEAD_K64 4
+
+/*
+ * Maximum size of a buffer that we\'ll map. Making this
+ * too big will degrade performance due to the number of
+ * pages which need to be gathered. Making it too small
+ * will prevent us from doing large I/O\'s to hardware that
+ * needs it.
+ *
+ * This is currently set to 512 KB.
+ */
+#define XFS_MAX_BMAP_LEN_BB 1024
+#define XFS_MAX_BMAP_LEN_BYTES 524288
+
+/*
+ * Convert the given file system block to a disk block.
+ * We have to treat it differently based on whether the
+ * file is a real time file or not, because the bmap code
+ * does.
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_DB)
+xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
+#define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
+#else
+#define XFS_FSB_TO_DB(ip,fsb) \
+ (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
+ (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
+ XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)))
+#endif
+
+#define XFS_FSB_TO_DB_IO(io,fsb) \
+ (((io)->io_flags & XFS_IOCORE_RT) ? \
+ XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
+ XFS_FSB_TO_DADDR((io)->io_mount, (fsb)))
+
+/*
+ * Prototypes for functions in xfs_rw.c.
+ */
+
+int
+xfs_write_clear_setuid(
+ struct xfs_inode *ip);
+
+int
+xfs_bwrite(
+ struct xfs_mount *mp,
+ struct xfs_buf *bp);
+
+int
+xfs_bioerror(
+ struct xfs_buf *b);
+
+int
+xfs_bioerror_relse(
+ struct xfs_buf *b);
+
+int
+xfs_read_buf(
+ struct xfs_mount *mp,
+ xfs_buftarg_t *target,
+ xfs_daddr_t blkno,
+ int len,
+ uint flags,
+ struct xfs_buf **bpp);
+
+void
+xfs_ioerror_alert(
+ char *func,
+ struct xfs_mount *mp,
+ xfs_buf_t *bp,
+ xfs_daddr_t blkno);
+
+
+/*
+ * Prototypes for functions in xfs_vnodeops.c.
+ */
+
+int
+xfs_rwlock(
+ bhv_desc_t *bdp,
+ vrwlock_t write_lock);
+
+void
+xfs_rwunlock(
+ bhv_desc_t *bdp,
+ vrwlock_t write_lock);
+
+int
+xfs_change_file_space(
+ bhv_desc_t *bdp,
+ int cmd,
+ xfs_flock64_t *bf,
+ xfs_off_t offset,
+ cred_t *credp,
+ int flags);
+
+int
+xfs_set_dmattrs(
+ bhv_desc_t *bdp,
+ u_int evmask,
+ u_int16_t state,
+ cred_t *credp);
+
+#endif /* __XFS_RW_H__ */