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
21struct xfs_buf;
22struct xfs_inode;
23struct 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)
58static inline xfs_daddr_t
59xfs_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)
66static inline xfs_daddr_t
67xfs_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 * Prototypes for functions in xfs_rw.c.
76 */
77extern int xfs_write_clear_setuid(struct xfs_inode *ip);
78extern int xfs_write_sync_logforce(struct xfs_mount *mp, struct xfs_inode *ip);
79extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
80extern int xfs_bioerror(struct xfs_buf *bp);
81extern int xfs_bioerror_relse(struct xfs_buf *bp);
82extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
83			xfs_daddr_t blkno, int len, uint flags,
84			struct xfs_buf **bpp);
85extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
86				xfs_buf_t *bp, xfs_daddr_t blkno);
87
88/*
89 * Prototypes for functions in xfs_vnodeops.c.
90 */
91extern int xfs_rwlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
92extern void xfs_rwunlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
93extern int xfs_setattr(bhv_desc_t *, bhv_vattr_t *vap, int flags,
94		       cred_t *credp);
95extern int xfs_change_file_space(bhv_desc_t *bdp, int cmd, xfs_flock64_t *bf,
96				 xfs_off_t offset, cred_t *credp, int flags);
97extern int xfs_set_dmattrs(bhv_desc_t *bdp, u_int evmask, u_int16_t state,
98			   cred_t *credp);
99
100#endif /* __XFS_RW_H__ */
101