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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - fs/xfs/xfs_rw.h
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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.
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.
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
26 * Maximum count of bmaps used by read and write paths.
28 #define XFS_MAX_RW_NBMAPS 4
31 * Counts of readahead buffers to use based on physical memory size.
32 * None of these should be more than XFS_MAX_RW_NBMAPS.
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
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
46 * This is currently set to 512 KB.
48 #define XFS_MAX_BMAP_LEN_BB 1024
49 #define XFS_MAX_BMAP_LEN_BYTES 524288
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
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
)
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
)));
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
)
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
)));
75 * Prototypes for functions in xfs_rw.c.
77 extern int xfs_write_clear_setuid(struct xfs_inode
*ip
);
78 extern int xfs_write_sync_logforce(struct xfs_mount
*mp
, struct xfs_inode
*ip
);
79 extern int xfs_bwrite(struct xfs_mount
*mp
, struct xfs_buf
*bp
);
80 extern int xfs_bioerror(struct xfs_buf
*bp
);
81 extern int xfs_bioerror_relse(struct xfs_buf
*bp
);
82 extern 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
);
85 extern void xfs_ioerror_alert(char *func
, struct xfs_mount
*mp
,
86 xfs_buf_t
*bp
, xfs_daddr_t blkno
);
89 * Prototypes for functions in xfs_vnodeops.c.
91 extern int xfs_rwlock(bhv_desc_t
*bdp
, bhv_vrwlock_t write_lock
);
92 extern void xfs_rwunlock(bhv_desc_t
*bdp
, bhv_vrwlock_t write_lock
);
93 extern int xfs_setattr(bhv_desc_t
*, bhv_vattr_t
*vap
, int flags
,
95 extern 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
);
97 extern int xfs_set_dmattrs(bhv_desc_t
*bdp
, u_int evmask
, u_int16_t state
,
100 #endif /* __XFS_RW_H__ */