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1 /*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18 #ifndef __XFS_RW_H__
19 #define __XFS_RW_H__
20
21 struct xfs_buf;
22 struct xfs_inode;
23 struct xfs_mount;
24
25 /*
26 * Maximum count of bmaps used by read and write paths.
27 */
28 #define XFS_MAX_RW_NBMAPS 4
29
30 /*
31 * Counts of readahead buffers to use based on physical memory size.
32 * None of these should be more than XFS_MAX_RW_NBMAPS.
33 */
34 #define XFS_RW_NREADAHEAD_16MB 2
35 #define XFS_RW_NREADAHEAD_32MB 3
36 #define XFS_RW_NREADAHEAD_K32 4
37 #define XFS_RW_NREADAHEAD_K64 4
38
39 /*
40 * Maximum size of a buffer that we\'ll map. Making this
41 * too big will degrade performance due to the number of
42 * pages which need to be gathered. Making it too small
43 * will prevent us from doing large I/O\'s to hardware that
44 * needs it.
45 *
46 * This is currently set to 512 KB.
47 */
48 #define XFS_MAX_BMAP_LEN_BB 1024
49 #define XFS_MAX_BMAP_LEN_BYTES 524288
50
51 /*
52 * Convert the given file system block to a disk block.
53 * We have to treat it differently based on whether the
54 * file is a real time file or not, because the bmap code
55 * does.
56 */
57 #define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
58 static inline xfs_daddr_t
59 xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
60 {
61 return (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
62 (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
63 XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
64 }
65 #define XFS_FSB_TO_DB_IO(io,fsb) xfs_fsb_to_db_io(io,fsb)
66 static inline xfs_daddr_t
67 xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
68 {
69 return (((io)->io_flags & XFS_IOCORE_RT) ? \
70 XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
71 XFS_FSB_TO_DADDR((io)->io_mount, (fsb)));
72 }
73
74 /*
75 * Flags for xfs_free_eofblocks
76 */
77 #define XFS_FREE_EOF_LOCK (1<<0)
78 #define XFS_FREE_EOF_NOLOCK (1<<1)
79
80
81 /*
82 * helper function to extract extent size hint from inode
83 */
84 STATIC_INLINE xfs_extlen_t
85 xfs_get_extsz_hint(
86 xfs_inode_t *ip)
87 {
88 xfs_extlen_t extsz;
89
90 if (unlikely(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
91 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
92 ? ip->i_d.di_extsize
93 : ip->i_mount->m_sb.sb_rextsize;
94 ASSERT(extsz);
95 } else {
96 extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
97 ? ip->i_d.di_extsize : 0;
98 }
99 return extsz;
100 }
101
102 /*
103 * Prototypes for functions in xfs_rw.c.
104 */
105 extern int xfs_write_clear_setuid(struct xfs_inode *ip);
106 extern int xfs_write_sync_logforce(struct xfs_mount *mp, struct xfs_inode *ip);
107 extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
108 extern int xfs_bioerror(struct xfs_buf *bp);
109 extern int xfs_bioerror_relse(struct xfs_buf *bp);
110 extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
111 xfs_daddr_t blkno, int len, uint flags,
112 struct xfs_buf **bpp);
113 extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
114 xfs_buf_t *bp, xfs_daddr_t blkno);
115
116 /*
117 * Prototypes for functions in xfs_vnodeops.c.
118 */
119 extern int xfs_rwlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
120 extern void xfs_rwunlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
121 extern int xfs_setattr(bhv_desc_t *, bhv_vattr_t *vap, int flags,
122 cred_t *credp);
123 extern int xfs_change_file_space(bhv_desc_t *bdp, int cmd, xfs_flock64_t *bf,
124 xfs_off_t offset, cred_t *credp, int flags);
125 extern int xfs_set_dmattrs(bhv_desc_t *bdp, u_int evmask, u_int16_t state,
126 cred_t *credp);
127 extern int xfs_free_eofblocks(struct xfs_mount *mp, struct xfs_inode *ip,
128 int flags);
129
130 #endif /* __XFS_RW_H__ */