2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
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15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
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24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
40 * Maximum count of bmaps used by read and write paths.
42 #define XFS_MAX_RW_NBMAPS 4
45 * Counts of readahead buffers to use based on physical memory size.
46 * None of these should be more than XFS_MAX_RW_NBMAPS.
48 #define XFS_RW_NREADAHEAD_16MB 2
49 #define XFS_RW_NREADAHEAD_32MB 3
50 #define XFS_RW_NREADAHEAD_K32 4
51 #define XFS_RW_NREADAHEAD_K64 4
54 * Maximum size of a buffer that we\'ll map. Making this
55 * too big will degrade performance due to the number of
56 * pages which need to be gathered. Making it too small
57 * will prevent us from doing large I/O\'s to hardware that
60 * This is currently set to 512 KB.
62 #define XFS_MAX_BMAP_LEN_BB 1024
63 #define XFS_MAX_BMAP_LEN_BYTES 524288
66 * Convert the given file system block to a disk block.
67 * We have to treat it differently based on whether the
68 * file is a real time file or not, because the bmap code
71 #define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
72 static inline xfs_daddr_t
73 xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
75 return (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
76 (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
77 XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
79 #define XFS_FSB_TO_DB_IO(io,fsb) xfs_fsb_to_db_io(io,fsb)
80 static inline xfs_daddr_t
81 xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
83 return (((io)->io_flags & XFS_IOCORE_RT) ? \
84 XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
85 XFS_FSB_TO_DADDR((io)->io_mount, (fsb)));
89 * Prototypes for functions in xfs_rw.c.
91 extern int xfs_write_clear_setuid(struct xfs_inode *ip);
92 extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
93 extern int xfs_bioerror(struct xfs_buf *bp);
94 extern int xfs_bioerror_relse(struct xfs_buf *bp);
95 extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
96 xfs_daddr_t blkno, int len, uint flags,
97 struct xfs_buf **bpp);
98 extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
99 xfs_buf_t *bp, xfs_daddr_t blkno);
102 * Prototypes for functions in xfs_vnodeops.c.
104 extern int xfs_rwlock(bhv_desc_t *bdp, vrwlock_t write_lock);
105 extern void xfs_rwunlock(bhv_desc_t *bdp, vrwlock_t write_lock);
106 extern int xfs_change_file_space(bhv_desc_t *bdp, int cmd, xfs_flock64_t *bf,
107 xfs_off_t offset, cred_t *credp, int flags);
108 extern int xfs_set_dmattrs(bhv_desc_t *bdp, u_int evmask, u_int16_t state,
111 #endif /* __XFS_RW_H__ */