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