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