1 /*
2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
3 *
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.
7 *
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.
11 *
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
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.
18 *
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.
22 *
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
25 *
26 * http://www.sgi.com
27 *
28 * For further information regarding this notice, see:
29 *
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31 */
32 #ifndef __XFS_RW_H__
33 #define __XFS_RW_H__
34
35 struct xfs_buf;
36 struct xfs_inode;
37 struct xfs_mount;
38
39 /*
40 * Maximum count of bmaps used by read and write paths.
41 */
42 #define XFS_MAX_RW_NBMAPS 4
43
44 /*
45 * Counts of readahead buffers to use based on physical memory size.
46 * None of these should be more than XFS_MAX_RW_NBMAPS.
47 */
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
52
53 /*
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
58 * needs it.
59 *
60 * This is currently set to 512 KB.
61 */
62 #define XFS_MAX_BMAP_LEN_BB 1024
63 #define XFS_MAX_BMAP_LEN_BYTES 524288
64
65 /*
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
69 * does.
70 */
71 #if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_FSB_TO_DB)
72 xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
73 #define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
74 #else
75 #define XFS_FSB_TO_DB(ip,fsb) \
76 (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
77 (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
78 XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)))
79 #endif
80
81 #define XFS_FSB_TO_DB_IO(io,fsb) \
82 (((io)->io_flags & XFS_IOCORE_RT) ? \
83 XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
84 XFS_FSB_TO_DADDR((io)->io_mount, (fsb)))
85
86 /*
87 * Prototypes for functions in xfs_rw.c.
88 */
89
90 int
91 xfs_write_clear_setuid(
92 struct xfs_inode *ip);
93
94 int
95 xfs_bwrite(
96 struct xfs_mount *mp,
97 struct xfs_buf *bp);
98
99 int
100 xfs_bioerror(
101 struct xfs_buf *b);
102
103 int
104 xfs_bioerror_relse(
105 struct xfs_buf *b);
106
107 int
108 xfs_read_buf(
109 struct xfs_mount *mp,
110 xfs_buftarg_t *target,
111 xfs_daddr_t blkno,
112 int len,
113 uint flags,
114 struct xfs_buf **bpp);
115
116 void
117 xfs_ioerror_alert(
118 char *func,
119 struct xfs_mount *mp,
120 xfs_buf_t *bp,
121 xfs_daddr_t blkno);
122
123
124 /*
125 * Prototypes for functions in xfs_vnodeops.c.
126 */
127
128 int
129 xfs_rwlock(
130 bhv_desc_t *bdp,
131 vrwlock_t write_lock);
132
133 void
134 xfs_rwunlock(
135 bhv_desc_t *bdp,
136 vrwlock_t write_lock);
137
138 int
139 xfs_change_file_space(
140 bhv_desc_t *bdp,
141 int cmd,
142 xfs_flock64_t *bf,
143 xfs_off_t offset,
144 cred_t *credp,
145 int flags);
146
147 int
148 xfs_set_dmattrs(
149 bhv_desc_t *bdp,
150 u_int evmask,
151 u_int16_t state,
152 cred_t *credp);
153
154 #endif /* __XFS_RW_H__ */
155
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