| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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__ */ |